JP2003143096A - Data-transmitting method and device and data-receiving method, and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission system for data-compressing a digital video signal, and for operating word synchronizing data insertion and 8B/10B conversion, and for converting the data into serial data, and for transmitting the data so that the data can be reproduced surely at the reception side. SOLUTION: A digital video signal is data-compressed, so that a compressed digital video signal can be formed, by alternately linking a part where compressed data exist and a part in which compressed data do not exist. Then, an additional word data group including word synchronizing data, having a preliminarily set code, is inserted into the part where any compressed data do not exist so that first word sequence data can be obtained, and the data are 8B/10B converted. Then, second word sequence data, having the part based on the additional word data group, including the word synchronizing data posterior to the 8B/10B conversion having a preliminarily set code to the obtained based on the word synchronizing data, are formed. The second word sequence data are converted into serial data and transmitted.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The invention described in the claims of the present application is to insert word synchronization data into word string data based on a digital video signal and perform 8-bit / 10-bit conversion (8B / 10B conversion) processing. And give
A data transmission method for obtaining a transmission word string data having a predetermined word transmission rate, converting the transmission word string data into serial data, and transmitting the serial data, and a data transmission device used for the same, and The present invention relates to a data transmitting method and a data receiving method for receiving a serial data transmitted by the data transmitting apparatus and reproducing a digital video signal, and a data receiving apparatus used for the implementation.

[0002]

2. Description of the Related Art In the field of transmission of digital data containing information data representing various kinds of signal information such as image information, the digital data is serial data, an electric signal based on the serial data is obtained, and the coaxial data is obtained. A system that transmits through a transmission line formed by using a cable or a twisted pair line,
Alternatively, the digital data is converted to serial data, and the serial data is converted into an optical signal,
Systems and the like have been proposed in which transmission is performed through a transmission path formed by using fibers.

As one of such digital data transmission systems, a fiber channel system (Fibre Ch
What is called annel system) is known. Digital data handled under a digital data transmission system such as this fiber channel system is
On the transmitting side, for example, every 8 bits is converted into 10 bits, and the conversion is performed in accordance with a conversion table prepared in advance. 8B / 10B conversion processing is performed and 10-bit word string data Etc. are formed to form word string data. Then, what is actually transmitted is formed by 8B / 10B conversion processing.
The word string data such as bit word string data is further subjected to parallel / serial conversion (P / S conversion) processing for converting parallel data into serial data, which is serial data.

On the other hand, on the receiving side, the received serial data is subjected to serial / parallel conversion (S / P conversion) processing for converting the serial data into parallel data, so that 10-bit word string data, etc. Of the word string data is formed, the word string data is converted into 8-bit data every 10 bits, and the conversion is performed in accordance with a conversion table prepared in advance.
Bit conversion (10B / 8B conversion) processing is performed. Then, the original digital video signal is reproduced from the word string data formed by the 10B / 8B conversion process.

The data transmission performed by subjecting the digital data to be transmitted to the 8B / 10B conversion in this way is recognized as providing good transmission quality.

Further, in a digital data transmission system such as a fiber channel system, for example, digital data transmitted as 10-bit word string data is as shown in FIG. It is intended to follow a data format in which a minimum number of independent packets called "frames" are formed. The "frame" shown in FIG. 16 is composed of 2148 bytes as a whole, and its contents are a 4-byte frame start portion, a 24-byte frame header portion, and a 64-byte optional header portion. , A payload portion of 2048 bytes, an error check portion of 4 bytes, and a frame end portion of 4 bytes are successively arranged.

A 2048-byte payload part of each part of these "frames" stores 10-bit word string data representing signal information. That is,
For example, when 10-bit word string data is transmitted, the maximum of 20 bytes can be added to the payload on the transmitting side.
A large number of "frames" storing 48-byte 10-bit word string data are formed, and these are sequentially sent out. At the receiving side, 10-bit word string data is sent from the payload part of each of the "frames" that sequentially arrive. Take out.

In each of the 10-bit words in such 10-bit word string data, the number of "1" s in the 10-bits is larger than the "0" s.
The number of "0" is more than the number of "1", or
The number of "1" and the number of "0" are equal. In representing the states of the respective numbers of “1” and “0”, for example, running disparity (Running Diparity) is used.
The concept of sparity: RD) has been introduced,
When the number of "1" s is larger than the number of "0" s, it is said that the running disparity (RD) is positive, and "0"
Is greater than the number of "1", RD is said to be negative, and when the number of "1" and the number of "0" are equal,
Say RD is neutral. Then, word data in which the number of "1" is greater than the number of "0" is word data whose RD is positive, word data in which the number of "0" is greater than the number of "1" is word data whose RD is negative, Word data in which the number of "1" is equal to the number of "0" is word data in which RD is neutral (neutral word data)
Is called.

Further, when the 10-bit word string data is transmitted as described above, the S / P conversion process for obtaining the 10-bit word string data on the serial data received on the receiving side, and further, , 10B / 8B conversion performed on the 10-bit word string data obtained by the S / P conversion processing, it is necessary to accurately grasp each word data having a 10-bit structure. The 10-bit word string data transmitted after being transmitted is the data in which the word synchronization data is appropriately inserted. Although this word synchronization data is word data having a 10-bit structure, it has a specific code that is not used as word data having a 10-bit structure for transmitting information. When the word synchronization data is inserted, when the immediately previous word data has a negative RD, the RD is positive, and the immediately previous word data has a positive RD. At some time, RD is assumed to be negative.

Such word synchronization data is, for example,
The word data DS10 has a 10-bit structure and is code-named K28.5. FIG. 17 shows K2
A word data DS10 having a 10-bit structure called by a code name of 8.5 is shown.
0 is "00" that makes RD positive when CRD, which is the RD based on the word data arranged immediately before that, is negative (-).
11111010 ", and when the CRD, which is the RD based on the immediately preceding word data, is positive (+), it is set to" 11100000101 "with RD being negative (hereinafter," 0011111010 "is + K28.5. Also, "1100000101" is referred to as -K28.5).

On the other hand, in the field of video signals, digitization has been attempted from the viewpoint of diversifying transmission information and improving the quality of reproduced images, and some standardized digital video signals are available. Are known. For example, when playing back an image screen with an aspect ratio of 16: 9,
Digital video for interlaced scanning, which is standardized so that it can be performed with the number of active lines being substantially 483, and in which each frame image is formed by being divided into a first field image and a second field image. Signal (hereinafter 4
80I signal), and a digital video signal for progressive scanning (hereinafter, each frame image is formed without being divided into a first field image and a second field image).
480P signal) has been proposed.

During transmission, each of the 480I signal and the 480P signal is a luminance signal data sequence (Y data sequence) representing a luminance signal component in a video signal and a color difference signal data sequence (Y) representing a color difference signal component in a video signal. C _B / C _R data series) is subjected to a word multiplex process, and a predetermined part of the word multiplex data series formed thereby is timing reference code data (SAV: Start of Active Video and EAV:
It is supposed to be replaced by (End of Active Video),
It is a word-multiplexed 480I signal or a word-multiplexed 480P signal. In such a word multiplex 480I signal or word multiplex 480P signal, the frame rate is set to 3
0 / 1.001 Hz (for word multiplexed 480I signal)
Or 60 / 1.001 Hz (in the case of word multiplexed 480P signal), the number of bits per sample is 10 bits,
The number of samples per line is 1716, the number of samples per active line is 1440, the number of lines per frame is 525, and the number of lines per active image is 483. These word multiplex 48
Each of the 0I signal and the word-multiplexed 480P signal follows the data format as shown in FIG. 18, for example, and the word-multiplexed 480I signal is 10-bit word string data having a word transmission rate of 27 MBps, for example. Also, the word-multiplexed 480P signal is 10-bit word string data having a word transmission rate twice as high as that of the word-multiplexed 480I signal, that is, 27 MBps × 2 = 54 MBps.

FIG. 18 shows a line blanking portion in each line period of the word-multiplexed 480I signal or the word-multiplexed 480P signal and a portion corresponding to a part of the video data portion before and after the line blanking portion. In such a part, immediately before the part corresponding to each video data part,
4 words each consisting of 10 bits (3FF, 00
SAV, which is timing reference code data consisting of 10,000, XYZ), is arranged, and immediately after the portion corresponding to each video data portion, 4 words (3FF,, 000,000, EAV, which is timing reference code data of XYZ), is arranged.

The word-multiplexed 480I signal or the word-multiplexed 480P signal, which is a 10-bit quantized digital signal as shown in FIG. 18, is converted into serial data and the bit transmission rate is 270 Mbps (in the case of the word-multiplexed 480I signal. ) Or 540 Mbps
(In the case of a word-multiplexed 480P signal) is transmitted.

Also, a high definition television (HDTV)
Under the system, a digital video signal for interlaced scanning (hereinafter referred to as HDI signal) and a digital video signal for progressive scanning (hereinafter referred to as HDP signal) have been proposed. Each of the HDI signal and the HDP signal has a frame rate of 30 Hz or 30 / 1.00, for example.
1 Hz (for HDI signal) or 60 Hz or 60 / 1.001 Hz (for HDP signal), the total number of lines in each frame is 1,125, the number of samples per line is 2,200, and the number of valid data samples per line is 1920. It is assumed that These HDI
Each of the signal and the HDP signal has a data format as shown in FIG. 19, for example.

The HDI signal or HD shown in FIG.
The data format for the P signal is composed of a Y data sequence and a C _B / C _R data sequence, and the Y data sequence and the C _B / C _R data sequence are luminance signal information data (Y Signal data) and color difference signal information data (C _B /
C _R signal data).

Y data series and C_B/ C_RData series
Each of the word data forming each is composed of 10 bits
It is said that That is, the Y signal represented as the Y data series
No. information data and C_B/ C_RRepresented as a data series
C_B/ C_REach of the signal data is a 10-bit word
Is the image information data that has been quantized. So
Then, FIG. 19 shows each line period in the Y data series.
The line blanking area and the video data before and after it.
Part corresponding to part of the data part, and C_B/ C _Rdata
Line blanking section during each line period in the series
And the part corresponding to part of the video data part before and after
It is shown.

In the Y data series, 4 words (3FF (Y), 000 (Y), 000) each having 10 bits are formed immediately before the portion corresponding to each video data portion.
(Y), XYZ (Y)) are arranged, and immediately after the portion corresponding to each video data portion, 4 words (3FF (Y), 00 each having a 10-bit configuration are formed.
EA consisting of 0 (Y), 000 (Y), XYZ (Y))
V is arranged. Similarly, even in the C _B / C _R data series, immediately before the portion corresponding to each video data portion, 4 words (3FF (C), 0
S consisting of 00 (C), 000 (C), XYZ (C))
Immediately after the portion corresponding to each video data portion is arranged with AV, 4 words (3FF (C), 000 (C), 000 (C), XYZ, each having a 10-bit configuration are provided.
(C)) is arranged. Of course, each of EAV and SAV in the Y data series is arranged in a portion corresponding to each line blanking section in the Y data series, and each of EAV and SAV in the C _B / C _R data series is C _It is arranged in a portion corresponding to each line blanking portion in the _B / _CR data series.

When an HDI signal or HDP signal according to the data format consisting of such Y data sequence and C _B / C _R data sequence is transmitted, each EAV is added to the Y data sequence and the C _B / C _R data sequence. The word multiplexing processing is performed under the condition that the portion corresponding to the line blanking portion to be arranged is synchronized, and the word multiplexing HDI signal or the word multiplexing H as shown in FIG.
A DP signal is formed.

The word-multiplexed HDI signal is 10-bit word string data having a word transmission rate of, for example, 148.5 MBps, and the word-multiplexed HDP signal is
The word transmission rate is set to 2 for word multiplexed HDI signals.
Double, for example, 148.5 MBps × 2 = 297 MBps
10-bit word string data. Then, the word-multiplexed HDI signal or the word-multiplexed HDP signal, which is the 10-bit word string data as shown in FIG. 20, is converted into serial data and the bit transmission rate is 1.485 Gbps (in the case of the word-multiplexed HDI signal) or 2.97 Gbps (in the case of word multiplexed HDP signal) is transmitted.

[0021]

DISCLOSURE OF THE INVENTION The word multiplexed 480I signal, the word multiplexed 480P signal, the word multiplexed HDI signal, the word multiplexed HDP signal, etc., which are digital video signals, such as 480I signal, 480P signal, HD
For any transmission of I signal, HDP signal, etc., addition of word synchronization data and 8B / 10B conversion to any of 480I signal, 480P signal, HDI signal, HDP signal, etc. to be transmitted is performed on the transmission side. , Word synchronization data is added based on any one of 480I signal, 480P signal, HDI signal, HDP signal to be transmitted, and 8B / 10B converted 10-bit word string data is formed. The word string data is converted into serial data and transmitted by a transmission method, for example, from the viewpoint of effectively using an existing integrated circuit element (IC element) or the like in configuring a transmission / reception circuit. , That is what you want.

Further, 480I signal, 480P signal, H
The image information data forming one of the DI signal, the HDP signal, etc. usually has a huge amount of data. Therefore, when any of the 480I signal, 480P signal, HDI signal, HDP signal, etc. formed by such image information data is transmitted, the data amount is reduced without substantially lowering the data quality. It is desired that the data be compressed so that it can be reduced.

480I signal, 480P signal, H
Transmission of either DI signal, HDP signal, etc.
The data is compressed to reduce the data amount of the image information data forming the data, and the word sync data is added to the 10-bit word string data that has been subjected to 8B / 10B conversion. If it is to be carried out by a transmission method in which is converted into serial data and sent out, the above-mentioned request can be fulfilled, and
The digital video signal such as any of the 480I signal, the 480P signal, the HDI signal, and the HDP signal can be efficiently used, and the range of use thereof can be expanded.

480I signal, 480P signal, H
Efficient use of digital video signals such as DI signals, HDP signals, etc.
For example, it brings about further development of technology in the field of commercial or household electronic devices. Therefore, from this point of view, with means that can be arranged relatively easily,
The word synchronization data is added to the transmission of any of the 480I signal, the 480P signal, the HDI signal, the HDP signal, etc., after the data compression for reducing the data amount of the image information data forming the 8B / 10-bit word string data subjected to 10B conversion, 1
Based on the transmission method in which 0-bit word string data is converted into serial data and transmitted, a measure that can be transmitted so that the receiving side can surely reproduce it is required.

However, in the conventional case, on the transmitting side, data to be transmitted is subjected to data compression,
Furthermore, word synchronization data is inserted in it, and 8B / 1
A 0-B conversion is performed to form 10-bit word string data, and the 10-bit word string data is converted into serial data and transmitted, for example, 48
A transmission system capable of transmitting any of the 0I signal, the 480P signal, the HDI signal, the HDP signal, etc. so that it can be reliably reproduced on the receiving side by a means that can be arranged relatively easily. I can't find any examples. In addition, such 480I signal, 480P signal, HDI
A digital video signal such as a signal or HDP signal can be relatively easily arranged by a means capable of being arranged relatively easily.
It is not possible to find a document or the like that describes a technique related to a transmission system that can perform transmission so that the reception side can surely reproduce.

In view of the above point, the invention described in the claims of the present application is such that data to be transmitted is subjected to data compression, word synchronization data is inserted, and 8B
/ 10B conversion is performed to form 10-bit word string data, and the 10-bit word string data is converted into serial data and sent out.
Data transmission capable of transmitting a digital video signal, which is any one of a 480I signal, a 480P signal, an HDI signal, an HDP signal, etc., so that it can be reliably reproduced on the receiving side by means that can be arranged relatively easily. The method and the data transmission device used for the implementation thereof, and further the serial data transmitted by the data transmission method and the data transmission device, for example, a 480I signal, 4
Provided is a data receiving method capable of reproducing any of 80P signal, HDI signal, HDP signal and the like, and a data receiving apparatus used for the implementation.

[0027]

A data transmission method according to any one of claims 1 to 7 in the claims of the present application provides a digital video signal in units of a predetermined division period. The data compression is performed to form a compressed digital video signal in which a portion where the compressed data based on the digital video signal exists and a portion where such compressed data does not exist are alternately formed, and the compressed digital video signal Additional word data including the word synchronization data having the preset code in the portion of the compressed digital video signal where the compressed data does not exist by determining the clock frequency to obtain the determination output signal according to the determined clock frequency By performing the process of inserting a group in a manner corresponding to the discrimination output signal, a predetermined word transmission predetermined. After forming the first word string data having a rate, applying the 8B / 10B conversion to the first word string data, and performing the 8B / 10B conversion with the preset code obtained based on the word synchronization data, The second word string data including the part based on the additional word data group including the word synchronization data is formed, converted into serial data, and the serial data is transmitted to be transmitted.

A data transmission apparatus according to the invention described in any one of claims 8 to 10 in the claims of the present application applies data compression to a digital video signal in units of a predetermined division period. And a compressed digital video signal forming means for forming a compressed digital video signal in which a portion where the compressed data based on the digital video signal exists and a portion where such compressed data does not exist are alternately arranged, and a compressed digital video signal. A clock frequency discriminating means for discriminating a clock frequency of the compressed digital video signal obtained from the forming means and obtaining a discrimination output signal corresponding to the discriminated clock frequency; and a compressed digital video signal obtained from the compressed digital video signal forming means. Word synchronization data with a preset code is stored in the part where compressed data does not exist. The first word string data having a predetermined word transmission rate is performed by performing the processing of inserting the additional word data group including the word in a manner corresponding to the discrimination output signal obtained from the clock frequency discrimination means. A synchronous data insertion means for forming
8B / 10 having a preset code obtained based on the word synchronization data by subjecting the first word string data obtained from the synchronization data insertion means to 8B / 10B conversion.
8B / 10B conversion means for forming second word string data having a portion based on an additional word data group containing word synchronization data after B conversion, and second word string data obtained from the 8B / 10B conversion means To serial data and sends the serial data for transmission.

The data receiving method according to the invention described in claim 11 of the present application is an additional word data group including word synchronization data after 8B / 10B conversion having a preset code. And receiving serial data formed by converting word string data having a portion based on
By / P conversion, it is converted into word string data in which an additional word data group including word synchronization data is inserted,
A control signal corresponding to word synchronization data included in the additional word data group inserted in the word string data is formed, the word string data is subjected to 10B / 8B conversion, and word synchronization data having a preset code is included. The converted word string data in which the additional word data group is inserted is obtained, and the additional word data group containing the word synchronization data having a preset code is separated from the converted word string data to obtain compressed data based on the digital video signal. Is performed and a process for obtaining a compressed digital video signal in which a portion in which such compressed data does not exist are alternately arranged is performed in a manner corresponding to the control signal, and data compression processing is performed on the compressed digital video signal, Reproducing a digital video signal consisting of a series of divided periods based on compressed data It is.

Further, the data receiving apparatus according to the invention described in claim 12 or claim 13 in the claims of the present application is 8B / 1 having a preset code.
The receiving means for receiving the serial data formed by converting the word string data having the portion based on the additional word data group including the word synchronization data after the 0B conversion and the serial data received by the receiving means are
The P conversion converts the word string data into which the additional word data group including the word synchronization data is inserted.
/ P conversion means, control signal forming means for forming a control signal according to word synchronization data included in the additional word data group inserted in the word string data formed by the S / P conversion means, and S / P conversion 10B / 8B conversion is performed on the word string data obtained from the means to obtain converted word string data in which an additional word data group including word synchronization data having a preset code is inserted 1
An additional word data group including word synchronization data having a preset code is separated from the conversion word string data obtained from the 0B / 8B conversion means and the 10B / 8B conversion means, and compressed data based on a digital video signal is obtained. Word data separation means for performing a process for obtaining a compressed digital video signal in which existing portions and portions without such compressed data are alternately connected in a manner corresponding to a control signal, and compression obtained from the word data separation means Digital video signal reproducing means for performing data expansion processing on the digital video signal to reproduce a digital video signal in which divided periods based on the compressed data are continuous.

As described above, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, and claims 8 to 8 in the claims of the present application In the data transmission device according to the invention described in any of items 10 to 10, the input digital video signal is, for example, word-multiplexed 480I.
Signal, word multiplexed 480P signal, word multiplexed HDI signal, word multiplexed HDP signal 480I signal, 48
When any of the 0P signal, the HDI signal, and the HDP signal, a compressed digital video signal based on the signal is formed,
For the compressed digital video signal, for example, 48
Whether the compressed digital video signal is a compressed digital video signal based on the 0I signal, the 480P signal, the HDI signal, or the HDP signal is accurately determined by determining the clock frequency of the compressed digital video signal, and according to the determination result. A discriminant output signal is obtained.

Then, for example, a 480I signal or 4
For the data forming the compressed digital video signal based on the 80P signal, the HDI signal or the HDP signal,
The process of inserting the additional word data group including the word synchronization data is appropriately performed in a manner corresponding to the determination output signal to form the first word string data having a predetermined word transmission rate set in advance. And in addition,
8B / 10B conversion is applied to the first word string data,
Second word string data is formed.

The second word string data thus obtained is, for example, obtained based on a compressed digital video signal based on any of the 480I signal, the 480P signal, the HDI signal and the HDP signal. By setting the rate to a predetermined value, the input digital video signal, that is, 480I signal, 480P signal, HDI signal, or H
It is suitable for compressed digital video signals based on DP signals.

The second word string data, which makes the word transmission rate suitable for the compressed digital video signal based on the input digital video signal, is converted into serial data and sent out, which is set in advance. The word synchronization data having the code is included.
The word synchronization data having such a preset code is, for example, + K28.5 which is the word data DS10 whose RD is positive or −K28.5 which is the word data DS10 whose RD is negative.

The second word string data thus converted and transmitted as serial data is received at the receiving side.
Word synchronization data having a preset code is, for example, 480I signal, 480P signal, HDI signal, HD
Appropriately detected as a compressed digital video signal based on any of the P signals, and further as word synchronization data required for processing for reproducing the 480I signal or 480P signal based on the P signal, or the HDI signal or HDP signal. Will be. Further, the word string data other than the word synchronization data included in the second word string data which is converted into the serial data and is transmitted,
Good transmission quality is brought about by being obtained through the 8B / 10B conversion processing. Therefore, on the receiving side, reproduction of the second word string data based on the serial data received while obtaining good transmission quality, for example, 480I signal, 480P signal, H
A compressed digital video signal based on either the DI signal or the HDP signal, and the data synchronization state required for the processing for reproducing the 480I signal or the 480P signal or the HDI signal or the HDP signal based on the compressed digital video signal can be surely obtained. The state of being maintained is secured.

From the above, the data transmission method according to the invention described in any one of claims 1 to 7 in the scope of claims of the present application, or the claim 8 in the scope of claims of the present application According to the data transmission device of the invention described in any one of claims 10 to 10, data to be transmitted is subjected to data compression, word synchronization data is inserted, and further 8B / 10B conversion is performed. 10-bit word string data is formed, and the 10-bit word string data is converted into serial data and sent out. For example, 480I signal, 480
The digital video signal, which is any one of the P signal, the HDI signal, the HDP signal, etc., can be transmitted so that it can be reliably reproduced on the receiving side by means of a means that can be adjusted relatively easily.

The data receiving method according to the invention described in claim 11 in the claims of the present application, and
According to the data receiving device of the invention described in claim 12 or claim 13 in the claims of the present application,
For example, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, or the method of claim 8 to claim 10 in the claims of the present application The serial data transmitted by the data transmission device according to any of the inventions is received, and the received serial data is subjected to P / S conversion processing and 10B / 8B conversion,
For example, 480I signal, 480P signal, HDI signal, H
A compressed digital video signal based on any of the DP signals is obtained, and based on that, the 480I signal or 480P signal or the HDI signal or HDP signal is reliably reproduced.

[0038]

1 is a block diagram of a data transmission method according to an embodiment of the present invention, in which an example of a data transmission method according to the invention described in any one of claims 1 to 7 is implemented. An example of the data transmission device according to the invention described in any one of claims 8 to 10 in the range is shown.

In the example shown in FIG. 1, the digital video signal DOI or the digital video signal DOP is
As a digital video signal to be transmitted, an MFV (Multi Format VT) forming a compressed digital video signal forming unit is formed.
R) It is supplied to the encoder 10.

The digital video signal DOI is, for example, a word-multiplexed 480I signal composed of 10-bit word string data having a word transmission rate of 27 MBps.
The digital video signal DOP is, for example, a word-multiplexed 480P signal composed of 10-bit word string data having a word transmission rate of 54 MBps.

In the MFV encoder 10, the digital video signal DOI or DOP is subjected to a data compression process in units of a predetermined division period, for example, each frame period, to obtain the digital video signal DOI or DOP. A compressed digital video signal DCI or DCP in which a portion where compressed data based on each frame period exists and a portion where such compressed data does not exist are alternately arranged to form a compressed digital video signal DCI or DCP. Data compression processing for the digital video signal DOI or DOP in such a case is performed by, for example, MPEG (Moving Picture Experts G), which is a working group under the technical committee under the international standardization organization.
roup) and approved as a standard, MPE
According to a standard method called G.

Thereby, the compressed digital video signal DC
I includes compression data (compression rate: 25 / 270≈1 / 11), which is formed for each frame period of the digital video signal DOI and is compressed to, for example, 25 Mbps.
The word transmission rate is set to 2 as the frame period is continuous.
It is 8-bit word string data of 7 MBps. Further, the compressed digital video signal DCP is formed for each frame period of the digital video signal DOP and is compressed data, for example, compressed to 50 Mbps (compression rate: 5).
0/540 ≈ 1/11) for one frame period, and the word transmission rate is 54 MBps 8
It is used as bit word string data.

FIG. 2 shows a compressed digital video signal DCI or DCP formed in the MFV encoder 10.
An example is shown. 2A is a compressed digital video signal D
A series of one frame period (one frame) in CI or DCP is shown, and in each frame period,
The part (blank) where the compressed data does not exist follows the part where the compressed data exists.

FIG. 2B shows a sequence layer forming compressed data, which is a sequence header.
Code (SHC: 000001B3 (h), (h) is 1
Represents hexadecimal display, and the same applies below. )
Starting with a group of pictures (G
OP) are connected and the sequence end code (SE
C: 000001B7 (h)). 2C is
The GOP forming the sequence layer is shown. The GOP is a group start code (GSC: 000001B8).
(H)), and a plurality of picture data are arranged in a row. D of FIG. 2 shows the picture data forming the GOP, and the picture data starts with a picture start code (PSC: 00000100 (h)) and is composed of a plurality of slice data in series.

Further, E of FIG. 2 shows slice data forming the picture data, and the slice data starts with slice information, and a plurality of macroblock data is formed continuously. F of FIG. 2 shows the macroblock data which comprises slice data, Macroblock data starts with macroblock information, and it is comprised by linking several block data in it. G in FIG. 2 shows block data forming macro block data,
The block data is DCT data obtained by discrete cosine transform (DCT). It should be noted that in FIG. 2, the arrow t indicates the passage of time.

The compressed digital video signal DCI or DCP obtained from the MFV encoder 10 is supplied to the composite word string data forming unit 11.

Further, the MFV encoder 10 uses the compressed digital video signal DCI or D formed thereby.
The CP word clock signal CX is transmitted, and it is sent to the composite word string data forming unit 11 and the clock frequency determining unit 1.
Supply to 2. The word clock signal CX has a frequency corresponding to the word transmission rate of the compressed digital video signal DCI or DCP, and the word transmission rate is 27 MB.
The frequency of the word clock signal CX of the compressed digital video signal DCI of ps is 27 MHz, and the frequency of the word clock signal CX of the compressed digital video signal DCP of 54 Mps is 54M.
Hz.

The clock frequency discriminating section 12 detects the frequency of the supplied word clock signal CX, and based on the detected frequency, is the word clock signal CX of the compressed digital video signal DCI or the compressed digital video signal? It is determined whether the signal is that of the signal DCP. That is, if the detected frequency is 27 MHz, the word clock signal CX is that of the compressed digital video signal DCI, and if the detected frequency is 54 MHz, the word clock signal CX is the compressed digital video signal DCP. It is determined that it is a thing. Then, the clock frequency discrimination section 12 generates a discrimination output signal SCD according to the discrimination result, and outputs it to the composite word string data forming section 1
Supply to 1.

As a result of the discrimination by the clock frequency discriminating section 12, when the word clock signal CX is of the compressed digital video signal DCI, the discrimination output signal SCD
Indicates that the compressed digital video signal DCI having a word transmission rate of 27 MBps is supplied to the composite word string data forming unit 11, and when the word clock signal CX is of the compressed digital video signal DCP,
The determination output signal SCD is the composite word string data forming unit 11
Shows that a compressed digital video signal DCP having a word transmission rate of 54 MBps is supplied.

The composite word string data forming unit 11 is provided with a compressed digital video signal DCI or D supplied thereto.
A horizontal synchronizing signal SH and a vertical synchronizing signal SV which are respectively synchronized with the CP line period and field period or frame period, and a clock signal C having a frequency of 54 MHz.
A is also supplied.

In the composite word string data forming unit 11, the compressed digital video signal DCI or DCP from the MFV encoder 10 is supplied to the synchronous data inserting unit 13. The sync data insertion unit 13 includes a word clock signal CX, a horizontal sync signal SH, a vertical sync signal SV, and a clock signal CA obtained from the MFV encoder 10.
Is also supplied.

The composite word string data forming unit 11 also includes a word data sending unit 14 for sending the additional word data group DWI and an additional word data group D.
A word data transmission unit 15 for transmitting WP is provided. Each of the word data transmission units 14 and 15 has a discrimination output signal SC from the clock frequency discrimination unit 12.
D is supplied.

Then, the discrimination output signal SCD is sent to the composite word string data forming section 11 as the compressed digital video signal DCI.
Is supplied, the word data sending unit 14 is set to send the additional word data group DWI, and the determination output signal SCD is sent to the composite word string data forming unit 11 as the compressed digital video signal DCP. Is supplied, the word data sending unit 15
Sends the additional word data group DWP. Each of the additional word data groups DWI and DWP is composed of a plurality of 8-bit word data including 8-bit word synchronization data, and is 8-bit word string data having a word transmission rate of 54 MBps. The DWI and the additional word data group DWP have different codes or contents.

Additional word data group DWI sent from the word data sending section 14 and additional word data group DW sent from the word data sending section 15
P is the synchronization data insertion unit 13 through the data addition unit 16.
Is supplied to.

In the sync data inserting section 13, a compressed digital video signal D forming 8-bit word string data is formed.
For CI or DCP, the word transmission rate of compressed digital video signal DCI is 27 MBp.
s to 54 MBps, and for the compressed digital video signal DCP, the additional word data group DWI or the additional word data group DWP is maintained with the word transmission rate maintained at 54 MBps.
Is performed.

In performing such processing, the synchronization data insertion unit 1
In No. 3, when the discrimination output signal SCD from the clock frequency discrimination unit 12 indicates that the compressed digital video signal DCI is supplied to the composite word string data forming unit 11, the word transmission rate is changed to 54 MBps. In the compressed digital video signal DCI, the word transmission rate including the 8-bit word synchronization data from the word data transmission unit 14 is set to the portion where there is no compressed data following the portion where the compressed data exists in each frame period. 54
An additional word data group DWI of MBps is inserted to set the word transmission rate to 54 as shown in FIG.
Composite 8-bit word string data DZ (8) with MBps
To form. The arrow t in FIG. 2 indicates the passage of time (similar in other figures).

Further, in the synchronous data insertion section 13, the discrimination output signal SC from the clock frequency discrimination section 12
When D indicates that the compressed digital video signal DCP is supplied to the composite word string data forming unit 11,
In the compressed digital video signal DCP having a word transmission rate of 54 MBps, the 8-bit word synchronization data from the word data transmission unit 15 is applied to a portion where there is no compressed data following the portion where the compressed data exists in each frame period. An additional word data group DWP having a word transmission rate of 54 MBps is inserted to form composite 8-bit word string data DZ (8) having a word transmission rate of 54 MBps as shown in FIG.

FIG. 4 shows a concrete configuration example of the synchronous data inserting section 13. In the example shown in FIG. 4,
The compressed digital video signal DCI or DCP supplied to the composite word string data forming unit 11 is supplied to the switch 20. The control signal CSA from the switch control signal forming unit 21 is also supplied to the switch 20.

The switch control signal forming unit 21 is supplied with the horizontal synchronizing signal SH and the vertical synchronizing signal SV, and the switch control signal forming unit 21 outputs the control signal CSA in accordance with the horizontal synchronizing signal SH and the vertical synchronizing signal SV. , The compressed digital video signal D supplied to the composite word sequence data forming section 11
It is formed as being synchronized with each frame period in CI or DCP.

A memory section 22 and a memory section 23 are connected to the switch 20. Then, the switch 20 switches at each time point of the beginning of each frame period in the compressed digital video signal DCI or DCP according to the control signal CSA synchronized with each frame period in the compressed digital video signal DCI or DCP. Thereby, the compressed digital video signal DCI or DCP
However, the memory unit 22 and the memory unit 23 for each one frame period
Are alternately supplied to the memory unit 22 and the memory unit 23 for the compressed digital video signal DCI or DCP.
The condition that the distributed supply to and is performed is taken.

Further, regarding the memory units 22 and 23,
The memory control signal forming unit 24 is provided, and the memory control signal forming unit 24 is supplied with the word clock signal CX and the clock signal CA. Then, the memory control signal forming unit 24 sets the frequency to 27 MHz or 54 MHz.
Based on the word clock signal CX
The write control signal QW having a frequency of 7 MHz or 54 MHz is generated, and the read control signal QR having a frequency of 54 MHz is generated based on the clock signal CA.

That is, from the memory control signal forming section 24,
The word transmission rate is set to 2 in the composite word string data forming unit 11.
When the compressed digital video signal DCI of 7 MBps is supplied, the write control signal Q having a frequency of 27 MHz
W and a read control signal QR having a frequency of 54 MHz are obtained, and when the compressed digital video signal DCP having a word transmission rate of 54 MBps is supplied to the composite word string data forming unit 11, a write having a frequency of 54 MHz is performed. An embedded control signal QW and a read control signal QR having a frequency of 54 MHz are obtained. Then, the memory control signal forming unit 2
Reference numeral 4 supplies the write control signal QW and the read control signal QR to both the memory sections 22 and 23.

As a result, in the memory section 22, when the compressed digital video signal DCI is supplied to the composite word string data forming section 11, the compressed digital video signal DCI is supplied through the switch 20 during the compressed digital video signal DCI. One frame period of the video signal DCI is written in a state in which the word transmission rate is 27 MBps according to the write control signal QW having a frequency of 27 MHz. Further, even in the memory unit 23, when the compressed digital video signal DCI is supplied to the composite word string data forming unit 11, the compressed digital video signal DCI is supplied during the period in which the compressed digital video signal DCI is supplied through the switch 20. The frequency is 27 MHz for one frame period.
Data is written in a state where the word transmission rate is 27 MBps according to the write control signal QW for z.

Therefore, when the compressed digital video signal DCI is supplied to the composite word string data forming section 11,
A switch for writing in the memory units 22 and 23 in a state where the word transmission rate for one frame period of the compressed digital video signal DCI is 27 MBps is performed at each head time point for each frame period of the compressed digital video signal DCI. Alternately according to the switching of 20.

Further, in the memory section 22, the compressed digital video signal DC is added to the composite word string data forming section 11.
When P is supplied, in the period in which the compressed digital video signal DCP is supplied through the switch 20, one frame period of the compressed digital video signal DCP is word-transmitted in accordance with the write control signal QW having a frequency of 54 MHz. It is written with the rate set to 54 MBps.
Further, even in the memory section 23, when the compressed digital video signal DCP is supplied to the composite word string data forming section 11, the compressed digital video signal D is passed through the switch 20.
In the period in which CP is supplied, the word transmission rate is 5 for one frame period of the compressed digital video signal DCP according to the write control signal QW having a frequency of 54 MHz.
It is written in a state of 4 MBps.

Therefore, when the compressed digital video signal DCP is supplied to the composite word string data forming section 11,
A switch for writing in the memory units 22 and 23 in a state where the word transmission rate for one frame period of the compressed digital video signal DCP is 54 MBps is performed at each head point of each frame period of the compressed digital video signal DCP. Alternately according to the switching of 20.

When the compressed digital video signal DCI for one frame period is written in each of the memory units 22 and 23, one frame period of the compressed digital video signal DCI written in the memory unit 22 is 1 of the compressed digital video signal DCI following the writing period
In the period corresponding to the frame period, the frequency is set to 54
According to the read control signal QR set to MHz, the memory unit 22
8 bit words are sequentially read to form an 8-bit word, and one frame period of the compressed digital video signal DCI written in the memory section 23 is also compressed digital video signal following the write period. DC
In the period corresponding to one frame period of I, 8-bit words are sequentially read from the memory unit 23 in accordance with the read control signal QR having a frequency of 54 MHz to sequentially form 8-bit words. . As a result, the memory unit 2
54MBps word transmission rate from 2 and 23 respectively
The 8-bit word string data DX ′ (8) is obtained and is supplied to the switch 25.

Similarly, when the compressed digital video signal DCP for one frame period is written in each of the memory units 22 and 23, the compressed digital video signal DCP written in the memory unit 22 for one frame period. The minute is a compressed digital video signal D following the writing period.
In the period corresponding to one frame period of CP, 8-bit words are sequentially read from the memory unit 22 in accordance with the read control signal QR having a frequency of 54 MHz, and 8-bit words are sequentially formed. In addition, one frame period of the compressed digital video signal DCP written in the memory unit 23 is also changed in a period corresponding to one frame period of the compressed digital video signal DCP following the writing period.
In response to the read control signal QR whose frequency is 54 MHz,
It is assumed that 8-bit words are sequentially read from the memory section 23 to form 8-bit words. As a result, the word transmission rate from each of the memory units 22 and 23 is 54M.
8-bit word string data DX ′ (8) for Bps is obtained and supplied to the switch 25.

The switch 25 is also supplied with a control signal CSA from the switch control signal forming section 21 in synchronization with each frame period in the compressed digital video signal DCI or DCP supplied to the composite word string data forming section 11. . Then, the switch 25 alternately takes out the 8-bit word string data DX ′ (8) read from the memory unit 22 and the 8-bit word string data DX ′ (8) read from the memory unit 23 in response to the control signal CSA. , Thereby forming 8-bit word string data DX (8) having a word transmission rate of 54 MBps.

The 8-bit word string data DX (8) obtained from the switch 25 is supplied to the switch 26 and also to the SHC; SEC detection section 27.

SHC: In the SEC detector 27, 8-bit word string data D which is a compressed digital video signal
The SHC and SEC as shown in B of FIG. 2 contained in the compressed data for each frame period of X (8) are detected, and the SHC detection output signal S corresponding to the detected SHC is detected.
SEC detection output signal S corresponding to SH and SEC detected
And SE.

SHC: The SHC detection output signal SSH and the SEC detection output signal SSE from the SEC detection section 27 are supplied to the control signal forming section 28. Control signal forming unit 28
Is a control signal CSB corresponding to the SHC detection output signal SSH.
And a control signal CSC corresponding to the SEC detection output signal SSE, and supply them to the switch 26. The control signal CSB is supplied to the switch 26 in synchronization with the SHC located at the beginning of the compressed data in each frame period of the 8-bit word string data DX (8) obtained from the switch 25, and the control signal CSC. Is supplied to the switch 26 in synchronization with the SEC located at the end of the compressed data in each frame period of the 8-bit word string data DX (8) obtained from the switch 25.

The switch 26 has eight switches from the switch 25.
In addition to the bit word string data DX (8), the additional word data group DWI that sets the word transmission rate from the word data transmission unit 14 to 54 MBps, or the word transmission rate from the word data transmission unit 15 to 54 MBps
An additional word data group DWP of ps is supplied. Then, the switch 26 operates from the switch 25 from the time when the supply of the control signal CSB from the control signal forming unit 28 is started to the end of the supply of the control signal CSC from the control signal forming unit 28 thereafter. When the supply of the control signal CSB from the control signal forming unit 28 is started after the supply of the control signal CSC from the control signal forming unit 28 is subsequently taken out from the bit word string data DX (8) Until then, the operation of extracting the additional word data group DWI from the word data transmitting unit 14 or the additional word data group DWP from the word data transmitting unit 15 is repeated. As a result, the switch 26 extracts the portion of the 8-bit word string data DX (8) from the switch 25 in which the compressed data exists in each frame period, and the word following the portion in which the compressed data exists is extracted. Data transmission unit 1
4 additional word data group DWI or additional word data group D from the word data sending unit 15
The state in which the WP is taken out is repeated.

As a result, from the switch 26, the additional word data group DWI is added to the portion of the 8-bit word string data DX (8) where there is compressed data in each frame period and there is no compressed data. Alternatively, it is formed by performing a process of inserting a DWP,
As shown in FIG. 3, each frame period is composed of compressed data and a subsequent additional word data group DWI or DWP, and the word transmission rate is 54 MBp.
Composite 8-bit word string data DZ (8) for s is obtained.

In this case, for the 8-bit word string data DX (8) obtained from the switch 25, the additional word data group DWI from the word data sending unit 14 is added.
Alternatively, the 8-bit word string data DX can be detected by detecting a portion in which compressed data is present in each frame period in which the additional word data group DWP from the word data transmitting unit 15 is to be inserted and there is no compressed data.
S included in the compressed data in each frame period of (8)
This is done by detecting EC and SHC.

The word transmission rate is 54 MBps.
The composite 8-bit word string data DZ (8) is sent from the synchronous data insertion unit 13 and supplied to the 8B / 10B conversion unit 30. The word transmission rate of 54MBps is
The transmission rate is selected as suitable for transmitting the compressed digital video signals DCI and DCP.

In the 8B / 10B conversion section 30, the composite 8-bit word string data DZ (8) is converted into 10 bits every 8 bits, and the conversion follows a conversion table prepared in advance. 8B / 10B
Converted, composite 10-bit word string data DZ
(10) is formed. Then, the 8B / 10B conversion unit 3
From 0, composite 10-bit word string data DZ (10) having a word transmission rate of 54 MBps is compressed digital video signal DCI or compressed digital video signal D.
Obtained as based on CP.

Each of the additional word data group DWI having a word transmission rate of 54 MBps from the word data transmitting section 14 and the additional word data group DWP having a word transmission rate of 54 MBps from the word data transmitting section 15 has 8 bits. It is configured as word string data, but as an example, the additional word data group DW
I is constituted by arranging 8-bit word synchronization data DEK8 in each of the first part and the last part, and arranging a plurality of arbitrary 8-bit word data DEX8 between them. Further, in the additional word data group DWP, the 8-bit word synchronization data DEK8, the 8-bit auxiliary word data DEA8, and the 8-bit word synchronization data DEK8 are connected in the first part, and the 8-bit word synchronization data DEK8 is in the last part. Are arranged, and a plurality of arbitrary 8-bit word data DEX8 are arranged between them.

The 8-bit word synchronization data DEK8 is 1
This is 8-bit word data that is converted to 0-bit word data and becomes the above-mentioned word data DS10. Therefore, when the 8-bit word synchronization data DEK8 is converted into 10-bit word data, it is called with a code name of K28.5, and the CRD which is the RD of the word data arranged immediately before it is negative (-). When
+ K28.5, and when the CRD, which is the RD according to the word data placed immediately before that, is positive (+),
-K28.5.

The 8-bit auxiliary word data DEA8
5 is 8-bit word data represented by "01110101" as shown in FIG. 5, and when converted into 10-bit word data, it is called by a code name of D21.3. D21.3 is "101010110" in which RD is neutral when CRD, which is RD based on the word data arranged immediately before it, is negative (-).
It is set to 0 ", and R according to the word data immediately before that is set.
When CRD which is D is positive (+), it is set to "1010001111" which makes RD neutral.

Further, arbitrary 8-bit word data DE
When 8B / 10B conversion is performed, X8 becomes 10-bit word data DXX · X.

Such additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting I or DWP, the portion in which the additional word data group DWI is inserted is as shown in A of FIG. Word data group DW
The portion where P is inserted is as shown in A of FIG. In each of A of FIG. 6 and A of FIG. 7, DD8 is
It represents 8-bit word data forming DX ′ (8) obtained from each of the memory units 22 and 23 shown in FIG. 4, and is converted into 10-bit word data DD10 by 8B / 10B conversion.

In the 8B / 10B conversion section 30, the composite 8-bit word string data D from the synchronous data insertion section 13
Composite 10-bit word string data DZ having a word transmission rate of 54 MBps based on composite 8-bit word string data DZ (8) by subjecting Z (8) to 8B / 10B conversion.
8-bit word synchronization data DE when forming (10)
K8 is converted to K28.5, 8-bit auxiliary word data DEA8 is converted to D21.3, and
Arbitrary 8-bit word data DEX8 is 10-bit word data DXX. Converted to X.

Therefore, the composite 8-bit word string data D
Additional word data group DWI inserted in Z (8)
Alternatively, when the DWP is as shown in A of FIG. 6 or A of FIG. 7, the composite 10-bit word string data DZ (10) has a portion based on the additional word data group DWI in its immediately preceding portion. When the 10-bit word data DD10 makes RD positive (+), it is as shown in B of FIG. 6, while when the immediately preceding 10-bit word data DD10 makes RD negative (-), As shown in FIG. 6C, the portion based on the additional word data group DWP in it is the 10-bit word data DD1 immediately before it.
When 0 makes RD positive (+), it is as shown in B of FIG. 7, while when 10-bit word data DD10 immediately before it makes RD negative (-), C of FIG. As shown in.

Therefore, in any case, the portion based on the additional word data group DWI or DWP is
+ K28.5 in which RD is positive (+) or -K28.5 in which RD is negative (-) is included, and in the part based on the additional word data group DWI and the part based on the additional word data group DWP, The inclusion of + K28.5 or -K28.5 is different. That is, the part based on the additional word data group DWI includes + K28.5 and -K28.5 one word at a time, and the part based on the additional word data group DWP includes one word + K28.5 and two words. -K28.
5 or 2 words + K28.5 and 1 word-
K28.5 is included.

The composite 10-bit word string data DZ
(10) is the additional word data group D in it
The portion based on WI or DWP may include the identification word DID10 as shown in FIG. 8A shows the immediately preceding 10-bit word data DD1.
0 indicates a portion based on the additional word data group DWI or DWP when 0 makes RD positive (+),
B of FIG. 8 shows a portion based on the additional word data group DWI or DWP when the immediately preceding 10-bit word data DD10 makes RD negative (-). Identification word DID10 included in the portion based on the additional word data group DWI, and the additional word data group DW
The identification word DID10 included in the part based on P is
Therefore, the identification word DID10 is included in the part based on the additional word data group DWI or the part based on the additional word data group DWP, depending on the content. Can be determined.

DD10 and D shown in FIGS. 8A and 8B
XX · X is the same as that shown in A and B of FIG. 6 and A and B of FIG. 7.

Under the above-described conditions, the composite 10-bit word string data DZ (10) obtained from the 8B / 10B conversion unit 30 and having the word transmission rate of 54 MBps is sent from the composite word string data forming unit 11. , P / S conversion unit 31. In the P / S conversion unit 31, the composite 10-bit word string data DZ (10) is subjected to P / S conversion to generate the composite 10-bit word string data DZ (10).
Based on, the bit transmission rate is 54MBps × 10 = 5
The serial data DZS of 40 Mbps is formed, and the serial data DZS is supplied to the transmitter 32. The transmitter 32 transmits the serial data DZS through, for example, a data transmission line formed by using a coaxial cable or an optical fiber, and an electric signal suitable for the data transmission line formed by using the coaxial cable. Alternatively, it is transmitted as a transmission signal SZ which is an optical signal or the like suitable for a data transmission path formed by using an optical fiber. Thereby, the serial data DZS is transmitted.

Under these circumstances, the P / S converter 31 and the transmitter 32 combine the composite 10-bit word string data DZ (10).
To form serial data DZS and send it out for transmission.

In the example of the data transmission apparatus shown in FIG. 1 as described above, the P / S converter 31 and the transmitter 32 are provided.
However, since the composite 10-bit word string data DZ (10) having a word transmission rate of 54 MBps is converted into serial data DZS having a bit transmission rate of 540 Mbps and transmitted, such a P / S conversion unit is used. Three
1 and the transmitter 32 are, for example, a fiber channel
It can be configured by effectively utilizing an integrated circuit element or the like provided for transmitting a digital video signal under the system.

Further, in the example shown in FIG. 1 described above, the 8-bit word string data DX (8) obtained from the switch 25 in the specific configuration example shown in FIG. , The compressed data following the portion in which the compressed data exists in each frame period into which the additional word data group DWI from the word data transmitting unit 14 or the additional word data group DWP from the word data transmitting unit 15 should be inserted. The detection of the nonexistent portion is performed by detecting the SHC and the SHC included in the compressed data in each frame period of the 8-bit word string data DX (8).
Although it is performed by detecting EC, detection of a portion where there is no compressed data following a portion where there is compressed data in each frame period of the 8-bit word string data DX (8) is 8 bits. It is also possible to use the GSC as shown in C of FIG. 2 or the PSC as shown in D of FIG. 2 included in the compressed data in each frame period of the word string data DX (8). It is possible.

FIG. 9 is a scope of claims of the present application in which another example of the data transmission method according to the invention described in any one of claims 1 to 7 in the scope of claims of the present application is implemented. Another example of the data transmission device according to the invention described in any one of claims 8 to 10 is described.

In the example shown in FIG. 9, the digital video signal DHI or the digital video signal DHP is
The digital video signal to be transmitted is supplied to the MFV encoder 40 that constitutes the compressed digital video signal forming unit.

The digital video signal DHI is, for example, a word multiplexed HDI signal composed of 10-bit word string data having a word transmission rate of 148.5 MBps, and the digital video signal DHP has, for example, a word transmission rate of 297 MBps. And a word multiplexed HDP signal composed of 10-bit word string data.

In the MFV encoder 40, the digital video signal DHI or DHP is subjected to a data compression process in units of a predetermined division period, for example, each frame period, to obtain the digital video signal DHI or DHP. A compressed digital video signal DCI or DCP is formed in which a portion where compressed data based on each frame period exists and a portion where such compressed data does not exist are alternately connected. The data compression process for the digital video signal DHI or DHP in such a case is also in accordance with a standard system called MPEG, for example.

As a result, the compressed digital video signal DC
I is formed by every frame period of the digital video signal DHI, for example, one frame period including compressed data compressed at 300 Mbps (compression rate: 300 / 148.5≈1 / 5) is continuous. 8 bit word string data having a word transmission rate of 74.25 MBps. Further, the compressed digital video signal DCP is formed for each frame period of the digital video signal DHP, and for example, includes one frame including compressed data compressed at 600 Mbps (compression rate: 600 / 297≈1 / 5). A word transmission rate of 148.
It is 8-bit word string data of 5 MBps.

The compressed digital video signal DCI or DCP formed in the MFV encoder 40 also follows the data format as shown in FIG. 2, for example. Then, the compressed digital video signal DCI or DCP obtained from the MFV encoder 40 is supplied to the composite word string data forming unit 41.

Further, the MFV encoder 40 uses the compressed digital video signal DCI or D formed by the MFV encoder 40.
The CP word clock signal CX is transmitted, and is sent to the composite word string data forming unit 41 and the clock frequency discriminating unit 4.
Supply to 2. The word clock signal CX has a frequency corresponding to the word transmission rate of the compressed digital video signal DCI or DCP, and the word transmission rate is 74.2.
The frequency of the word clock signal CX of the compressed digital video signal DCI that is 5 MBps is 74.25 MHz, and the frequency of the word clock signal CX of the compressed digital video signal DCP that is 148.5 MBps is 148.5 MHz. is there.

The clock frequency discriminating section 42 detects the frequency of the supplied word clock signal CX, and based on the detected frequency, is the word clock signal CX of the compressed digital video signal DCI or the compressed digital video signal? It is determined whether the signal is that of the signal DCP. That is, if the detected frequency is 74.25 MHz, the word clock signal CX is that of the compressed digital video signal DCI, and if the detected frequency is 148.5 MHz, the word clock signal CX is the compressed digital video signal. It is determined that the video signal DCP belongs. Then, the clock frequency discrimination unit 42 generates a discrimination output signal SCD according to the discrimination result and supplies it to the composite word string data formation unit 41.

As a result of the discrimination in the clock frequency discriminating section 42, when the word clock signal CX is of the compressed digital video signal DCI, the discrimination output signal SCD
Is a compressed digital video signal D having a word transmission rate of 74.25 MBps in the composite word string data forming section 41.
CI indicates that the word clock signal CX is the compressed digital video signal DCP, and the determination output signal SCD indicates that the composite word string data forming unit 41 has a word transmission rate of 148.5 MBps. It indicates that the compressed digital video signal DCP is being supplied.

The composite word string data forming section 41 is provided with a compressed digital video signal DCI or D supplied thereto.
A horizontal synchronizing signal SH and a vertical synchronizing signal SV respectively synchronized with the CP line period and field period or frame period, and a clock signal CA having a frequency of 100 MHz are also supplied.

In the composite word string data forming section 41, the compressed digital video signal DCI or DCP from the MFV encoder 40 is supplied to the synchronous data inserting section 43. The sync data insertion unit 43 includes a word clock signal CX, a horizontal sync signal SH, a vertical sync signal SV, and a clock signal CA obtained from the MFV encoder 40.
Is also supplied.

Further, the composite word string data forming section 41 has a word data transmitting section 44 for transmitting the additional word data group DWI and an additional word data group D.
A word data transmission unit 45 for transmitting WP is provided. Each of the word data transmission units 44 and 45 has a discrimination output signal SC from the clock frequency discrimination unit 42.
D is supplied.

Then, the discrimination output signal SCD is sent to the composite word string data forming section 41 as the compressed digital video signal DCI.
Is supplied, the word data sending section 44 is set to send the additional word data group DWI, and the discrimination output signal SCD is sent to the composite word string data forming section 41 as the compressed digital video signal DCP. Is supplied, the word data sending unit 45
Sends the additional word data group DWP. Each of the additional word data groups DWI and DWP is composed of a plurality of 8-bit word data including 8-bit word synchronization data, and is 8-bit word string data having a word transmission rate of 100 MBps. The DWI and the additional word data group DWP have different codes or contents.

The additional word data group DWI sent from the word data sending unit 44 and the additional word data group DW sent from the word data sending unit 45.
P is the synchronization data insertion unit 43 through the data addition unit 46.
Is supplied to.

In the synchronous data inserting section 43, the compressed digital video signal D forming 8-bit word string data is formed.
For CI or DCP, the word transmission rate of the compressed digital video signal DCI is 74.25.
Speed conversion for changing from MBps to 100 MBps, and for the compressed digital video signal DCP, the word transmission rate is changed from 148.5 MBps to 100 MBp.
The additional word data group DWI or additional word data group DW
A process of inserting P is performed.

In performing such processing, the synchronization data insertion unit 4
In No. 3, when the discrimination output signal SCD from the clock frequency discrimination unit 42 indicates that the compressed digital video signal DCI is supplied to the composite word string data formation unit 41, the word transmission rate is changed to 100 MBps. In the compressed digital video signal DCI, a portion from the word data sending unit 44 to the portion where there is no compressed data following the portion where the compressed data exists in each frame period
1 word transmission rate including bit word synchronization data
A composite 8-bit word string data D having a word transmission rate of 100 MBps is inserted as shown in FIG. 10 by inserting an additional word data group DWI of 00 MBps.
Z (8) is formed.

Further, in the synchronous data inserting section 43, the discrimination output signal SC from the clock frequency discriminating section 42.
When D indicates that the compressed digital video signal DCP is supplied to the composite word string data forming unit 41,
In the compressed digital video signal DCP whose word transmission rate has been changed to 100 MBps, 8-bit word synchronization from the word data transmission unit 45 is performed in a portion where there is no compressed data following a portion where compressed data exists in each frame period. 100M word transmission rate including data
An additional word data group DWP of Bps is inserted to set the word transmission rate to 10 as shown in FIG.
Composite 8-bit word string data DZ with 0 MBps
(8) is formed.

FIG. 11 shows a concrete configuration example of the synchronous data inserting section 43. In the example shown in FIG. 11, the compressed digital video signal DCI or DCP supplied to the composite word string data forming unit 41 is the switch 5
Supplied to zero. The control signal CSA from the switch control signal forming unit 51 is also supplied to the switch 50.

The switch control signal forming section 51 is supplied with the horizontal synchronizing signal SH and the vertical synchronizing signal SV, and the switch control signal forming section 51 outputs the control signal CSA in accordance with the horizontal synchronizing signal SH and the vertical synchronizing signal SV. , The compressed digital video signal D supplied to the composite word string data forming unit 41
It is formed as being synchronized with each frame period in CI or DCP.

A memory section 52 and a memory section 53 are connected to the switch 50. Then, the switch 50 switches at each head time point of each frame period of the compressed digital video signal DCI or DCP in accordance with the control signal CSA synchronized with each frame period of the compressed digital video signal DCI or DCP. Thereby, the compressed digital video signal DCI or DCP
However, the memory unit 52 and the memory unit 53 for each one frame period
Are alternately supplied to the memory unit 52 and the memory unit 53 for the compressed digital video signal DCI or DCP.
The condition that the distributed supply to and is performed is taken.

Further, regarding the memory units 52 and 53,
The memory control signal forming section 54 is provided, and the word clock signal CX and the clock signal CA are supplied to the memory control signal forming section 54. Then, the memory control signal forming unit 54 sets the frequency to 74.25 MHz or 14
Based on the word clock signal CX of 8.5 MHz, the frequency is 74.25 MHz or 148.5 MH
The write control signal QW for z is generated and the read control signal QR for generating a frequency of 100 MHz is generated based on the clock signal CA.

That is, from the memory control signal forming section 54,
The word transmission rate is set to 7 in the composite word string data forming unit 41.
Compressed digital video signal DCI with 4.25 MBps
Is supplied, a write control signal QW having a frequency of 74.25 MH and a read control signal QR having a frequency of 100 MHz are obtained, and the composite word string data forming unit 4
1 is supplied with a compressed digital video signal DCP having a word transmission rate of 148.5 MBps, a write control signal QW having a frequency of 148.5 MH and a frequency of 10
A read control signal QR with 0 MHz is obtained. Then, the memory control signal forming unit 54 supplies the write control signal QW and the read control signal QR to both the memory units 52 and 53.

As a result, in the memory section 52, when the compressed digital video signal DCI is supplied to the composite word string data forming section 41, the compressed digital video signal DCI is supplied through the switch 50 during the compressed digital video signal DCI. One frame period of the video signal DCI is written with the word transmission rate set to 74.25 MBps according to the write control signal QW set to the frequency of 74.25 MHz. Even in the memory section 53, the compressed digital video signal D is added to the composite word string data forming section 41.
When CI is supplied, one frame period of the compressed digital video signal DCI is supplied in the period in which the compressed digital video signal DCI is supplied through the switch 50 according to the write control signal QW having a frequency of 74.25 MHz. It is written with the word transmission rate set to 74.25 MBps.

Therefore, when the compressed digital video signal DCI is supplied to the composite word string data forming section 41,
Writing in the memory units 52 and 53 in a state where the word transmission rate for one frame period of the compressed digital video signal DCI is 74.25 MBps is performed at each time point of the beginning of each frame period of the compressed digital video signal DCI. According to the switching of the switch 50, the operation is alternately performed.

Further, in the memory section 52, the compressed digital video signal DC is added to the composite word string data forming section 41.
When P is supplied, in the period in which the compressed digital video signal DCP is supplied through the switch 50, one frame period of the compressed digital video signal DCP corresponds to the write control signal QW whose frequency is 148.5 MHz.
It is written in a state where the word transmission rate is 148.5 MBps. Even in the memory section 53, the compressed digital video signal DCP is added to the composite word string data forming section 41.
Is supplied in the period in which the compressed digital video signal DCP is supplied through the switch 50, one frame period of the compressed digital video signal DCP corresponds to the word in accordance with the write control signal QW having a frequency of 148.5 MHz. It is written in a state where the transmission rate is 148.5 MBps.

Therefore, when the compressed digital video signal DCP is supplied to the composite word string data forming section 41,
Writing in the memory units 52 and 53 in a state where the word transmission rate for one frame period of the compressed digital video signal DCP is 148.5 MBps is carried out at every head point of each frame period of the compressed digital video signal DCP. According to the switching of the switch 50, the operation is alternately performed.

When the compressed digital video signal DCI for one frame period is written in each of the memory units 52 and 53, one frame period of the compressed digital video signal DCI written in the memory unit 52 is 1 of the compressed digital video signal DCI following the writing period
In the period corresponding to the frame period, the frequency is set to 10
According to the read control signal QR which is 0 MHz, the memory unit 5
It is assumed that 8-bit words are sequentially read out from 2 to 8 bits, and that one frame period of the compressed digital video signal DCI written in the memory section 53 is also compressed digital video following the writing period. Signal DC
In the period corresponding to one frame period of I, 8-bit words are sequentially read from the memory unit 53 in accordance with the read control signal QR having a frequency of 100 MHz to sequentially form 8-bit words. . As a result, the word transmission rate from each of the memory units 52 and 53 is 100 MB.
8-bit word string data DX ′ (8) for ps is obtained and supplied to the switch 55.

Similarly, when the compressed digital video signal DCP for one frame period is written in each of the memory units 52 and 53, the compressed digital video signal DCP written in the memory unit 52 for one frame period. The minute is a compressed digital video signal D following the writing period.
In the period corresponding to one frame period of CP, 8-bit words are sequentially read from the memory unit 52 in accordance with the read control signal QR having a frequency of 100 MHz to sequentially form 8-bit words. In addition, the one-frame period of the compressed digital video signal DCP written in the memory unit 53 is read with the frequency set to 100 MHz in the period corresponding to the one-frame period of the compressed digital video signal DCP following the writing period. In response to the control signal QR, 8 bits are read from the memory unit 53 to obtain 8 bits.
It is assumed that bit words are sequentially formed. As a result, the 8-bit word string data DX ′ that sets the word transmission rate to 100 MBps from each of the memory units 52 and 53.
(8) is obtained and supplied to the switch 55.

The switch 55 is also supplied with a control signal CSA from the switch control signal forming section 51 in synchronization with each frame period in the compressed digital video signal DCI or DCP supplied to the composite word string data forming section 41. . Then, the switch 55 alternately takes out the 8-bit word string data DX ′ (8) read from the memory unit 52 and the 8-bit word string data DX ′ (8) read from the memory unit 53 according to the control signal CSA. , Thereby forming 8-bit word string data DX (8) having a word transmission rate of 100 MBps.

The 8-bit word string data DX (8) obtained from the switch 55 is supplied to the switch 56 and the SHC; SEC detection section 57.

SHC: In the SEC detector 57, 8-bit word string data D which is a compressed digital video signal
The SHC and SEC as shown in B of FIG. 2 contained in the compressed data for each frame period of X (8) are detected, and the SHC detection output signal S corresponding to the detected SHC is detected.
SEC detection output signal S corresponding to SH and SEC detected
And SE.

SHC: The SHC detection output signal SSH and the SEC detection output signal SSE from the SEC detection section 57 are supplied to the control signal forming section 58. Control signal forming unit 58
Is a control signal CSB corresponding to the SHC detection output signal SSH.
And a control signal CSC corresponding to the SEC detection output signal SSE, and supplies them to the switch 56. The control signal CSB is supplied to the switch 56 in synchronization with the SHC located at the start end of the compressed data in each frame period of the 8-bit word string data DX (8) obtained from the switch 55, and the control signal CSC. Is supplied to the switch 56 in synchronization with the SEC located at the end of the compressed data in each frame period of the 8-bit word string data DX (8) obtained from the switch 55.

The switch 56 has eight switches from the switch 55.
In addition to the bit word string data DX (8), the word transmission rate from the word data sending unit 44 is 100 MBps.
The additional word data group DWI or the word transmission rate from the word data sending unit 45 is 100
An additional word data group DWP of MBps is supplied. The switch 56 includes a control signal forming unit 58.
From the start of the supply of the control signal CSB from the control signal forming unit 58 to the end of the supply of the control signal CSC from the control signal forming unit 58, the 8-bit word string data DX (8) from the switch 55 is taken out, After that, from the time when the supply of the control signal CSC from the control signal forming unit 58 ends, the control signal CS from the control signal forming unit 58 thereafter
Until the supply of B is started, the operation of extracting the additional word data group DWI from the word data transmitting unit 44 or the additional word data group DWP from the word data transmitting unit 45 is repeated. As a result, the switch 56 extracts the portion of the 8-bit word string data DX (8) from the switch 55 where the compressed data is present during each frame period, and the portion where the compressed data is present is followed by the word. The state in which the additional word data group DWI from the data sending unit 44 or the additional word data group DWP from the word data sending unit 45 is taken out is repeated.

As a result, from the switch 56, the additional word data group DWI is added to the portion of the 8-bit word string data DX (8) where the compressed data exists in each frame period and the compressed data does not exist. Alternatively, it is formed by performing a process of inserting a DWP,
As shown in FIG. 10, each frame period consists of compressed data and a subsequent additional word data group DWI or DWP, and the word transmission rate is 100M.
Composite 8-bit word string data DZ (8) with Bps is obtained.

In this case, for the 8-bit word string data DX (8) obtained from the switch 55, the additional word data group DWI from the word data sending section 44 is added.
Alternatively, the 8-bit word string data DX is detected by detecting a portion in which compressed data is present in each frame period in which the additional word data group DWP from the word data transmitting unit 45 is to be inserted and there is no compressed data.
S included in the compressed data in each frame period of (8)
This is done by detecting EC and SHC.

Then, the word transmission rate is set to 100 MBp.
The composite 8-bit word string data DZ (8) to be s is sent from the synchronous data insertion unit 43 and supplied to the 8B / 10B conversion unit 60. Word transmission rate 100MBps
Is the transmission rate selected as suitable for the transmission of the compressed digital video signals DCI and DCP.

In the 8B / 10B conversion unit 60, the composite 8-bit word string data DZ (8) is converted into 10 bits every 8 bits, and the conversion follows a conversion table prepared in advance. 8B / 10B
Converted, composite 10-bit word string data DZ
(10) is formed. Then, the 8B / 10B conversion unit 6
From 0, composite 10-bit word string data DZ (10) having a word transmission rate of 100 MBps is obtained as one based on the compressed digital video signal DCI or the compressed digital video signal DCP.

Each of the additional word data group DWI having a word transmission rate of 100 MBps from the word data sending unit 44 and the additional word data group DWP having a word transmission rate of 100 MBps from the word data sending unit 45 has 8 bits. Although it is configured as word string data, as an example, an additional word data group DWI having a word transmission rate of 54 MBps from the word data transmission section 14 and a word transmission rate from the word data transmission section 15 shown in FIG. 54 MBps
As in the case of the additional word data group DWP, the additional word data group DWI is provided with 8-bit word synchronization data DEK8 in each of the first part and the last part, and a plurality of arbitrary word data are arranged between them. Of the additional word data group DWP, and the additional word data group DWP includes the 8-bit word synchronization data DEK8, the 8-bit auxiliary word data DEA8, and the 8-bit word synchronization data in the first part thereof. Along with DEK8, 8 in the last part
Bit word synchronization data DEK8 is arranged, and a plurality of arbitrary 8-bit word data DEX8 are arranged between them.

Such additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting I or DWP, the portion into which the additional word data group DWI is inserted is similar to that shown in A of FIG. 6, and The portion in which the additional word data group DWP is inserted is similar to that shown in A of FIG.

In the 8B / 10B conversion unit 60, the composite 8-bit word string data D from the synchronous data insertion unit 43 is used.
Composite 10-bit word string data D having a word transmission rate of 100 MBps based on composite 8-bit word string data DZ (8) by subjecting Z (8) to 8B / 10B conversion
8-bit word synchronization data D when forming Z (10)
EK8 is converted to K28.5, 8-bit auxiliary word data DEA8 is converted to D21.3, and any 8-bit word data DEX8 is converted to 10-bit word data DXX. Converted to X.

Therefore, in the composite 10-bit word string data DZ (10), the portion based on the additional word data group DWI in it is as shown in FIG. 6B or C in FIG. The same, and also
The part based on the additional word data group DWP in that is shown in B of FIG. 7 or C of FIG.
The same as that shown in.

Therefore, in any case, the portion based on the additional word data group DWI or DWP is
+ K28.5 in which RD is positive (+) or -K28.5 in which RD is negative (-) is included, and in the part based on the additional word data group DWI and the part based on the additional word data group DWP, The inclusion of + K28.5 or -K28.5 is different.

The composite 10-bit word string data DZ
(10) is the additional word data group D in it
The portion based on WI or DWP may be similar to that including the identification word DID10 shown in FIG. In that case, the additional word data group DWI
The identification word DID10 included in the portion based on the above and the identification word DID10 included in the portion based on the additional word data group DWP represent different contents from each other. Therefore, the identification word DID10 depends on the contents represented by the identification word DID10. It is possible to discriminate whether it is included in the part based on the additional word data group DWI or included in the part based on the additional word data group DWP.

Under the above-described conditions, the composite 10-bit word string data DZ (10) obtained from the 8B / 10B conversion unit 60 and having a word transmission rate of 100 MBps is sent from the composite word string data forming unit 41. , P / S conversion unit 61. In the P / S converter 61,
P / S conversion is performed on the composite 10-bit word string data DZ (10) to generate the composite 10-bit word string data DZ (1
0), the bit transmission rate is 100 MBps x 1
Forming serial data DZS with 0 = 1 Gbps,
The serial data DZS is supplied to the transmitter 62. The transmitting unit 62 transmits the serial data DZS through a data transmission line formed by using a coaxial cable or an optical fiber, for example, and an electric signal suitable for the data transmission line formed by using the coaxial cable. Alternatively, it is transmitted as a transmission signal SZ which is an optical signal or the like suitable for a data transmission path formed by using an optical fiber. Thereby, the serial data DZS is transmitted.

Under the above circumstances, the P / S converter 61 and the transmitter 62 receive the composite 10-bit word string data DZ (10).
To form serial data DZS and send it out for transmission.

In the example of the data transmission device shown in FIG. 9 as described above, the P / S conversion unit 61 and the transmission unit 62 are included.
However, the composite 10 with a word transmission rate of 100 MBps
Since the bit word string data DZ (10) is converted into serial data DZS having a bit transmission rate of 1 Gbps and transmitted, such a P / S converter 61 is used.
The transmitter 62 can be configured by effectively using, for example, an integrated circuit device or the like provided for transmitting a digital video signal under the fiber channel system.

Further, in the example shown in FIG. 9 described above, 8 obtained from the switch 55 in the specific configuration example shown in FIG. 11 for the synchronous data inserting section 43.
For the bit word string data DX (8), the compressed data in each frame period into which the additional word data group DWI from the word data sending unit 44 or the additional word data group DWP from the word data sending unit 45 is to be inserted is The detection of the portion where there is no compressed data following the existing portion is the 8-bit word string data DX (8).
Is performed by detecting SHC and SEC included in the compressed data for each frame period, the portion of the 8-bit word string data DX (8) where the compressed data for each frame period exists. The detection of the portion where there is no compressed data subsequent to is included in the compressed data during each frame period of the 8-bit word string data DX (8), which is indicated by C in FIG.
It is also possible to use GSC as shown in FIG. 2 or PSC as shown in D of FIG.

FIG. 12 is described in claim 12 or claim 13 of the present application, in which the data receiving method according to the invention described in claim 11 of the present application is implemented. An example of the data receiving apparatus which concerns on invention is shown.

The example of the data receiving apparatus shown in FIG. 12 is shown in FIG. 1 according to the example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. The transmission signal SZ based on the serial data DZS obtained by converting the composite 10-bit word string data DZ (10), which is transmitted from the transmission unit 32 in the illustrated data transmission device, is received.

In the example shown in FIG. 12, for example,
A receiver 70 is provided for receiving a transmission signal SZ transmitted through a data transmission line formed by using a coaxial cable or a data transmission line formed by using an optical fiber. When receiving the transmission signal SZ, the receiving unit 70 reproduces the serial data DZS having a bit transmission rate of 540 Mbps based on the received transmission signal SZ, and reproduces the serial data DZ.
ZS is supplied to the synchronous data detection / S / P conversion unit 71.

In the synchronous data detection / S / P converter 71, + K28.5 or -K28.5 which is 10-bit word synchronous data in the serial data DZS having the supplied bit transmission rate of 540 Mbps is serial. The portion converted into data is detected as synchronous data, and the serial data DZS is S / P converted by performing word synchronization based on the detected synchronous data to obtain parallel data based on the serial data DZS.

At this time, the synchronous data detection / S / P conversion unit 7
1 has a bit transmission rate of 540M in the receiving unit 70.
The reception state for the serial data DZS at bps is properly set, and the bit transmission rate from the receiving unit 70 is set to 5
When the serial data DZS of 40 Mbps is properly obtained, the composite 10-bit word string data DZ (10), which is parallel data having a word transmission rate of 54 MBps, is formed based on the serial data DZS.

The composite 10-bit word string data DZ (10) having a word transmission rate of 54 MBps, which is obtained in the synchronous data detection / S / P converter 71, includes a portion based on the additional word data group DWI or DWP. . Composite 10-bit word string data DZ (1
The portion based on the additional word data group DWI in (0) is set as shown in A or C of FIG. 13, and the composite 10-bit word string data DZ (1
The portion based on the additional word data group DWP in 0) is set as shown in A or C of FIG. 14, for example. Then, the synchronous data detection / S / P conversion unit 71
Composite 10-bit word string data DZ (1
0) is supplied to the data restoration unit 72.

Further, the synchronous data detection / S / P conversion unit 71
, + K28.5 and -K28.5 in the part based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10) having a word transmission rate of 54 MBps are detected, and K2
8.5 Send the detection output signal SWS. This K28.5
The detection output signal SWS is an additional word data group DWI in the composite 10-bit word string data DZ (10).
Depending on the code or content of the part based on
The additional word data group DWP in the composite 10-bit word string data DZ (10), which is obtained as having the contents shown in B or D of FIG.
Depending on the code or content of the part based on
It is obtained as having the contents as shown in B or D of FIG.

As described above, the synchronous data detection / S /
K28.5 detection output signal SW obtained from the P conversion unit 71
S is supplied to the control signal forming unit 73. In the control signal forming unit 73, the synchronization control signal CW corresponding to the portion based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10) is formed based on the K28.5 detection output signal SWS. In both cases, depending on the content of the K28.5 detection output signal SWS, K
28.5 Whether the detection output signal SWS is obtained from the portion based on the additional word data group DWI or the portion based on the additional word data group DWP,
In other words, the composite 10-bit word string data DZ (1
0) includes a portion based on the additional word data group DWI, and is obtained based on the compressed digital video signal DCI having a word transmission rate of 27 MBps, or includes a portion based on the additional word data group DWP. , Obtained based on a compressed digital video signal DCP having a word transmission rate of 54 MBps,
A discrimination signal CPI representing the above is formed.

The data restoration section 72 to which the composite 10-bit word string data DZ (10) having the word transmission rate of 54 MBps from the synchronous data detection / S / P conversion section 71 is supplied to the data restoration section 72 from the control signal forming section 73. Synchronous control signal CW
And a discrimination signal CPI. Then, in the data restoration unit 72, the composite 10-bit word string data DZ
(10) is supplied to the 10B / 8B conversion unit 74 and 10B
In the / 8B converter 74, the composite 10-bit word string data DZ (10) is subjected to 10B / 8B conversion,
Thereby, composite 8-bit word string data DZ (8) having a word transmission rate of 54 MBps is formed.

At this time, the 10-bit word data DD1 included in the composite 10-bit word string data DZ (10)
0 is converted into 8-bit word data DD8. Further, ± D which is 10-bit word data included in a portion based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10).
XX · X, ± K28.5 and D21.3 are 8-bit data DEX8 and 8-bit word synchronization data DEK, respectively.
Converted to 8- and 8-bit auxiliary word data DEA8. As a result, the composite 8-bit word string data DZ (8) obtained in the 10B / 8B conversion unit 74 is, for example,
It corresponds to the composite 8-bit word string data DZ (8) shown in A of FIG. 6 or A of FIG.

The composite 8-bit word string data DZ (8) from the 10B / 8B conversion unit 74 is supplied to the word data separation / speed conversion unit 75. The word data separation / speed conversion unit 75 is also supplied with the synchronization control signal CW and the determination signal CPI from the control signal formation unit 73. Then, in the word data separation / speed conversion unit 75, the word transmission rate is set to 54 from the composite 8-bit word string data DZ (8) under the synchronization control by the synchronization control signal CW.
The 8-bit word string data DX (8) of MBps and the 8-bit word string data of the additional word data group DWI or DWP are separated and taken out.

Further, in the word data separating / speed converting unit 75, the composite 8-bit word string data DZ is used.
8-bit word string data DX extracted from (8)
Regarding (8), depending on the determination signal CPI, the state in which the speed conversion for changing the word transmission rate from 54 MBps to 27 MBps is performed or the state in which the word transmission rate is maintained at 54 MBps is set. In this case, the determination signal CPI is obtained from the portion of the K28.5 detection output signal SWS based on the additional word data group DWI, in other words, the composite 10-bit word string data DZ (10). Includes a portion based on the additional word data group DWI, and a compressed digital video signal D having a word transmission rate of 27 MBps.
When it is shown that the data is obtained based on CI, the word conversion rate of the 8-bit word string data DX (8) is changed from 54 MBps to 27 MBps, the speed conversion is performed, and the determination signal CPI is set. But,
The K28.5 detection output signal SWS is obtained from a portion based on the additional word data group DWP,
In other words, the composite 10-bit word string data DZ (1
0) includes a part based on the additional word data group DWP, and is obtained based on the compressed digital video signal DCP having a word transmission rate of 54 MBps, the 8-bit word string data D
The state is maintained in which the word transmission rate of X (8) is maintained at 54 MBps.

As a result, in the word data separation / speed conversion unit 75, the additional word data group DWI or DWP is taken out and the compressed digital video signal DCI having the word transmission rate of 27 MBps or the compression having the word transmission rate of 54 MBps is performed. The digital video signal DCP is restored. In this way
The compressed digital video signal DCI or DCP obtained by the word data separation / speed conversion unit 75 is sent from the data decompression unit 72 and supplied to the MFV decoder 76.

When the compressed digital video signal DCI is supplied to the MFV decoder 76, the compressed digital video signal DCI contains the compressed data included in each frame period and appearing intermittently. The data decompression process is performed, and the data restored from the state compressed by the data decompression process is continued to form 10-bit word string data having a word transmission rate of 27 MBps, whereby the digital video signal DOI is formed. Is played. Further, in the MFV decoder 76, when the compressed digital video signal DCP is supplied, the compressed digital video signal DCP contains data on each of the compressed data which is included in each frame period and appears intermittently. Decompression processing is performed, and the data restored from the state compressed by the data decompression processing is made continuous so that the word transmission rate is 54 MB.
10-bit word string data of ps is formed, whereby the digital video signal DOP is reproduced.

FIG. 15 is described in claim 12 or claim 13 of the present application in which the data receiving method according to the invention described in claim 11 of the present application is implemented. 6 shows another example of the data receiving apparatus according to the invention.

The example of the data receiving apparatus shown in FIG. 15 is shown in FIG. 9 according to the example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. The transmission signal SZ based on the serial data DZS obtained by converting the composite 10-bit word string data DZ (10), which is transmitted from the transmission unit 62 in the illustrated data transmission device, is received.

In the example shown in FIG. 15, for example,
The receiver 80 is provided to receive the transmission signal SZ transmitted through a data transmission line formed by using a coaxial cable or a data transmission line formed by using an optical fiber. When receiving the transmission signal SZ, the receiving unit 80 reproduces the serial data DZS having a bit transmission rate of 1 Gbps based on the received transmission signal SZ, and reproduces the serial data DZS.
Is supplied to the synchronous data detection / S / P conversion unit 81.

In the synchronous data detection / S / P converter 81, + K28.5 or -K28.5 which is 10-bit word synchronous data in the supplied serial data DZS having a bit transmission rate of 1 Gbps is serial. The portion converted into data is detected as synchronous data, and the serial data DZS is S / P converted by performing word synchronization based on the detected synchronous data to obtain parallel data based on the serial data DZS.

At that time, the synchronous data detection / S / P conversion unit 8
1 is a bit transmission rate of 1 Gbp in the receiving unit 80.
The reception state for the serial data DZS of s is properly set, and the bit transmission rate from the receiving unit 80 is 1 Gb.
When the serial data DZS of ps is properly obtained, the composite 10-bit word string data DZ (10), which is parallel data having a word transmission rate of 100 MBps, is formed based on the serial data DZS.

The composite 10-bit word string data DZ (10) having a word transmission rate of 100 MBps, which is obtained in the synchronous data detection / S / P converter 81, includes a portion based on the additional word data group DWI or DWP. . Composite 10-bit word string data DZ (1
The portion based on the additional word data group DWI in 0) is similar to that shown in A or C of FIG. 13, and the additional word data group D in the composite 10-bit word string data DZ (10) is used.
The part based on WP is similar to that shown in A or C of FIG. 14, for example. Then, the composite 10-bit word string data DZ (10) obtained from the synchronous data detection / S / P conversion unit 81 is supplied to the data restoration unit 82.

Further, the synchronous data detection / S / P conversion unit 81
, + K28.5 and -K28.5 in the portion based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10) having a word transmission rate of 100 MBps are detected, and K
28.5 The detection output signal SWS is transmitted. This K28.
The 5 detection output signal SWS is an additional word data group DW in the composite 10-bit word string data DZ (10).
Depending on the code or contents of the part based on I, for example, it is obtained as having the same contents as those shown in B or D of FIG. 13, and in the composite 10-bit word string data DZ (10). Depending on the code or content of the portion based on the additional word data group DWP, for example, it can be obtained as having the same content as that shown in B or D of FIG.

As described above, the synchronous data detection / S /
K28.5 detection output signal SW obtained from the P conversion unit 81
S is supplied to the control signal forming unit 83. In the control signal forming unit 83, the synchronization control signal CW corresponding to the portion based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10) is formed based on the K28.5 detection output signal SWS. In both cases, depending on the content of the K28.5 detection output signal SWS, K
28.5 Whether the detection output signal SWS is obtained from the portion based on the additional word data group DWI or the portion based on the additional word data group DWP,
In other words, the composite 10-bit word string data DZ (1
0) includes a portion based on the additional word data group DWI, and has a word transmission rate of 74.25 MBps.
Which is obtained on the basis of the compressed digital video signal DCI or which includes a portion based on the additional word data group DWP, and has a word transmission rate of 148.5 MBp.
A discrimination signal CPI indicating whether or not it is obtained based on the compressed digital video signal DCP of s is formed.

The data restoration section 82 to which the composite 10-bit word string data DZ (10) having the word transmission rate of 100 MBps from the synchronous data detection / S / P conversion section 81 is supplied is supplied from the control signal forming section 83. Synchronous control signal C
W and the discrimination signal CPI are supplied. Then, in the data restoration unit 82, the composite 10-bit word string data D
Z (10) is supplied to the 10B / 8B conversion unit 84, and 10
The B / 8B converter 84 performs 10B / 8B conversion on the composite 10-bit word string data DZ (10), thereby forming composite 8-bit word string data DZ (8) having a word transmission rate of 100 MBps. .

At this time, the 10-bit word data DD1 included in the composite 10-bit word string data DZ (10)
0 is converted into 8-bit word data DD8. Further, ± D which is 10-bit word data included in a portion based on the additional word data group DWI or DWP in the composite 10-bit word string data DZ (10).
XX · X, ± K28.5 and D21.3 are 8-bit data DEX8 and 8-bit word synchronization data DEK, respectively.
Converted to 8- and 8-bit auxiliary word data DEA8. As a result, the composite 8-bit word string data DZ (8) obtained in the 10B / 8B conversion unit 84 is, for example,
It corresponds to the composite 8-bit word string data DZ (8) shown in A of FIG. 6 or A of FIG.

The composite 8-bit word string data DZ (8) from the 10B / 8B conversion unit 84 is supplied to the word data separation / speed conversion unit 85. The word data separation / speed conversion unit 85 is also supplied with the synchronization control signal CW and the determination signal CPI from the control signal formation unit 83. Then, in the word data separation / speed conversion unit 85, the word transmission rate is set to 10 from the composite 8-bit word string data DZ (8) under the synchronization control by the synchronization control signal CW.
The 8-bit word string data DX (8) of 0 MBps and the 8-bit word string data of the additional word data group DWI or DWP are separated and taken out.

Further, in the word data separation / speed conversion formation unit 85, the composite 8-bit word string data DZ is used.
8-bit word string data DX extracted from (8)
Regarding (8), a state in which speed conversion is performed to change the word transmission rate from 100 MBps to 74.25 MBps according to the determination signal CPI, or the word transmission rate is changed from 100 MBps to 148.5 MBps.
The speed is changed so that the speed is changed. In such a case, the determination signal CPI is the K28.5 detection output signal S
WS is obtained from a portion based on the additional word data group DWI, in other words, the composite 10-bit word string data DZ (10) includes a portion based on the additional word data group DWI, and word transmission is performed. The word transmission rate of the 8-bit word string data DX (8) is changed from 100 MBps to 74.25 MBps when the data is obtained based on the compressed digital video signal DCI whose rate is 74.25 MBps. The state in which the speed conversion is performed is taken, and the discrimination signal CPI is obtained from the portion based on the additional word data group DWP of the K28.5 detection output signal SWS, in other words, the composite 10-bit word. The column data DZ (10) includes a portion based on the additional word data group DWP. Stomach, the word transmission rate of 145.
The word transmission rate of the 8-bit word string data DX (8) is 100 when the data is obtained based on the compressed digital video signal DCP of 8 MBps.
The state where the speed conversion for changing from MBps to 148.5 MBps is performed is taken.

As a result, in the word data separation / speed conversion unit 85, the additional word data group DWI or DWP is taken out and the compressed digital video signal D whose word transmission rate is 74.25 MBps.
The compressed digital video signal DCP having a CI or word transmission rate of 148.5 MBps is restored. In this way, the compressed digital video signal DCI or DC obtained by the word data separation / speed conversion unit 85 is obtained.
P is sent from the data restoration unit 82 and supplied to the MFV decoder 86.

In the MFV decoder 86, when the compressed digital video signal DCI is supplied, the compressed digital video signal DCI contains the compressed data which is included in each frame period and appears intermittently. The data decompression process is performed, and the data restored from the state compressed by the data decompression process is continued to set the word transmission rate to 148.5 MBps 10.
Bit word string data is formed, and thereby the digital video signal DHI is reproduced. Further, in the MFV decoder 86, when the compressed digital video signal DCP is supplied, the compressed digital video signal DCP
, The data decompression process is performed for each of the compressed data that appears intermittently contained in each frame period in it, the data restored from the state compressed by the data decompression process is made continuous, 10-bit word string data having a word transmission rate of 297 MBps is formed, whereby the digital video signal DHP is reproduced.

[0167]

As is apparent from the above description, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, and the claims of the present application In the data transmission device according to the invention described in any one of claims 8 to 10, the input digital video signal is, for example,
Word multiplexed 480I signal, word multiplexed 480P signal, word multiplexed HDI signal, word multiplexed HDP signal 4
When any of the 80I signal, the 480P signal, the HDI signal, and the HDP signal, a compressed digital video signal is formed based on the 80I signal, the 480P signal, the HDI signal, and the HDP signal. Based on which the clock frequency of the compressed digital video signal is determined, it is possible to accurately determine which is the compressed digital video signal,
A discrimination output signal corresponding to the discrimination result is obtained.

Then, for example, a 480I signal or 4
For the data forming the compressed digital video signal based on the 80P signal, the HDI signal or the HDP signal,
The process of inserting the additional word data group including the word synchronization data is appropriately performed in a manner corresponding to the determination output signal to form the first word string data having a predetermined word transmission rate set in advance. And in addition,
8B / 10B conversion is applied to the first word string data,
Second word string data is formed.

The second word string data thus obtained is obtained based on a compressed digital video signal based on any one of the 480I signal, the 480P signal, the HDI signal and the HDP signal. By setting the rate to a predetermined value, the input digital video signal, that is, 480I signal, 480P signal, HDI signal, or H
It is suitable for compressed digital video signals based on DP signals.

The second word string data, which makes the word transmission rate suitable for the compressed digital video signal based on the input digital video signal, is converted into serial data and sent out, which is set in advance. The word synchronization data having the code is included.

The second word string data converted into serial data and sent out is, for example, word synchronization data having a preset code on the receiving side.
480I signal, 480P signal, HDI signal, compressed digital video signal based on any of the HDP signals, and further it is necessary for processing for reproducing the original 480I signal or 480P signal or the HDI signal or HDP signal based on it. It is assumed that the word synchronization data is properly detected. Further, the word string data other than the word synchronization data included in the second word string data which is converted into the serial data and sent out is supposed to be obtained through the 8B / 10B conversion process, and thus the good transmission is achieved. Will bring quality. Therefore, on the receiving side, reproduction of the second word string data based on the serial data received while obtaining good transmission quality, for example, 480I signal, 480P signal, HDI signal, HDP signal A compressed digital video signal based on either one, and the original 480 based on it
A state in which the data synchronization state required for the reproduction processing of the I signal or the 480P signal or the HDI signal or the HDP signal is surely obtained is ensured.

Accordingly, the data transmission method according to the invention described in any one of claims 1 to 7 in the scope of claims of the present application, or the claim 8 in the scope of claims of the present application According to the data transmission device of the invention described in any one of claims 10 to 14, data to be transmitted is subjected to data compression, word synchronization data is inserted, and further 8B / 10B conversion is performed. 10-bit word string data is formed, and the 10-bit word string data is converted into serial data and sent out. For example, 480I signal, 480
The digital video signal, which is any one of the P signal, the HDI signal, the HDP signal, etc., can be transmitted so that it can be reliably reproduced on the receiving side by means of a means that can be adjusted relatively easily.

[0173] Further, the data receiving method according to the invention described in claim 11 in the claims of the present application, and
According to the data receiving device of the invention described in claim 12 or claim 13 in the claims of the present application,
For example, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, or the method of claim 8 to claim 10 in the claims of the present application The serial data transmitted by the data transmission device according to any of the inventions is received, and the received serial data is subjected to P / S conversion processing and 10B / 8B conversion,
For example, 480I signal, 480P signal, HDI signal, H
A compressed digital video signal based on any of the DP signals is obtained, and based on that, the original 480I signal, 480P signal, HDI signal, or HDP signal is obtained.
The signal will be reliably reproduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of a data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application; FIG. 11 is a block configuration diagram showing an example of a data transmission device according to the invention described in any one of claims 10 to 10.

FIG. 2 illustrates an example of a data format of a compressed digital video signal formed in an example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. It is a conceptual diagram provided.

FIG. 3 is a composite 8 formed in the example shown in FIG.
FIG. 6 is a conceptual diagram provided for explaining an example of a data format of bit word string data.

FIG. 4 is a block configuration diagram showing a specific configuration example of a synchronization data insertion unit in the example shown in FIG.

FIG. 5 is a conceptual diagram provided for explaining 10-bit word data used in an example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. is there.

FIG. 6 is a time chart used for explaining an example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application.

FIG. 7 is a time chart provided for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application.

FIG. 8 is a time chart provided for explaining an example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application.

FIG. 9: Claims of this application in which another example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of this application is implemented FIG. 11 is a block configuration diagram showing another example of the data transmission device according to the invention described in any one of claims 8 to 10.

FIG. 10 is a conceptual diagram provided for explaining an example of a data format of composite 8-bit word string data formed in the example shown in FIG. 9.

11 is a block configuration diagram showing a specific configuration example of a synchronization data insertion unit in the example shown in FIG.

FIG. 12 shows an example of a data receiving apparatus for receiving a transmission signal transmitted according to an example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. It is a block diagram.

13 is a time chart used for explaining the operation of the data receiving apparatus shown in FIG.

FIG. 14 is a time chart used for explaining the operation of the data receiving apparatus shown in FIG.

FIG. 15 shows another data receiving apparatus for receiving a transmission signal transmitted according to another example of the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application. It is a block diagram showing an example of.

FIG. 16 is a conceptual diagram provided for explaining a “frame” used in transmission of digital data.

FIG. 17 is a conceptual diagram provided for explaining word synchronization data used in transmission of digital data.

FIG. 18 is a conceptual diagram provided for explaining an example of a data format of a digital video signal.

FIG. 19 is a conceptual diagram provided for explaining an example of a data format of a digital video signal.

FIG. 20 is a conceptual diagram provided for explaining an example of a data format of a digital video signal.

[Explanation of symbols]

10, 40 ... MFV encoder, 11, 41 ...
・ Composite word string data forming unit, 12, 42 ... Clock frequency discriminating unit, 13, 43 ... Synchronous data inserting unit, 14, 15, 44, 45 ... Word data sending unit, 16, 46 ...・ Data adder, 20, 25,
26, 50, 55, 56 ... Switch, 21, 51
... Switch control signal forming unit, 22, 23, 52,
53 ... Memory unit, 24, 54 ... Memory control signal forming unit, 27, 57 ... SHC; SEC detection unit,
28, 58, 73, 83 ... Control signal forming section, 3
0,60 ... 8B / 10B converter, 31, 61 ...
.P / S converter, 32, 62 ... Transmitter, 70,
80 ... Receiving unit, 71, 81 ... Synchronous data detecting / S / P converting unit, 72, 82 ... Data restoring unit,
74, 84 ... 10B / 8B converter, 75, 85
... Word data separation / speed conversion unit, 76, 86
..MFV decoders

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 7/24 H04N 7/13 ZF term (reference) 5C059 LA02 MA00 PP04 RB01 RC02 RC03 UA24 5K028 CC02 EE03 EE05 KK01 KK12 MM04 MM17 NN02 RR03 SS05 SS15 5K047 AA12 DD02 HH03 HH31 HH43

Claims (13)

[Claims] 1. A digital video signal is subjected to data compression in units of a predetermined division period, and a portion where compressed data based on the digital video signal exists and a portion where the compressed data does not exist alternately. A continuous compressed digital video signal is formed, the clock frequency of the compressed digital video signal is discriminated, and a discrimination output signal corresponding to the discriminated clock frequency is obtained, and the compressed data of the compressed digital video signal is present. By performing the processing of inserting the additional word data group including the word synchronization data having the preset code in the portion not to be performed in the mode corresponding to the determination output signal, the predetermined word transmission rate determined in advance can be obtained. To form the first word string data, and subject the first word string data to 8-bit / 10-bit conversion. And second word string data having a portion based on the additional word data group, which includes word synchronization data after 8-bit / 10-bit conversion having a preset code obtained based on the word synchronization data. And converting the second word string data into serial data,
A data transmission method for transmitting the serial data for transmission. 2. An 8-bit word string obtained by compressing compressed data constituting a compressed digital video signal to image information data representing a predetermined division period of the digital video signal, by performing data compression by high efficiency coding. The data transmission method according to claim 1, wherein the data transmission is data. 3. The data transmission method according to claim 2, wherein a predetermined divided period of the digital video signal is set as each frame period of the digital video signal. 4. The data transmission method according to any one of claims 1 to 3, wherein the additional word data group has a different code according to the discrimination output signal. 5. The additional word data group includes word synchronization data after 8-bit / 10-bit conversion in which the running disparity is positive in a portion based on the additional word data group in the second word string data. The data transmission method according to any one of claims 1 to 4, wherein the data transmission method is selected as a different one. 6. The additional word data group includes word synchronization data after 8-bit / 10-bit conversion in which the running disparity is negative in a portion based on the additional word data group in the second word string data. The data transmission method according to any one of claims 1 to 4, wherein the data transmission method is selected as a different one. 7. The additional word data group includes auxiliary word data, and the auxiliary word data is selected so that the running disparity becomes neutral after 8-bit / 10-bit conversion. 7. The data transmission method according to claim 6. 8. A digital video signal is subjected to data compression in units of a predetermined division period, and a portion where compressed data based on the digital video signal exists and a portion where the compressed data does not exist alternately. Compressed digital video signal forming means for forming a series of compressed digital video signals and a clock frequency of the compressed digital video signal obtained from the compressed digital video signal forming means are discriminated, and a discrimination output according to the discriminated clock frequency A clock frequency discriminating means for obtaining a signal, and an additional word data group including word synchronization data having a preset code in a portion of the compressed digital video signal obtained from the compressed digital video signal forming means where the compressed data does not exist. Is obtained from the clock frequency discriminating means. Synchronous data inserting means for forming the first word string data having a predetermined word transmission rate, which is performed in a manner corresponding to the separate output signal, and the first data obtained from the synchronous data inserting means. The additional word data group including the word sync data after the 8-bit / 10-bit conversion having the preset code obtained based on the word sync data by subjecting the word string data to the 8-bit / 10-bit conversion. 8 bits / 10 forming a second word string data having a portion based on
Data comprising bit conversion means and data transmission means for converting the second word string data obtained from the 8-bit / 10-bit conversion means into serial data and transmitting the serial data for transmission Transmission equipment. 9. Synchronous data inserting means comprises a plurality of word data transmitting sections for transmitting a plurality of additional word data groups having different codes, respectively, and in accordance with a discrimination output signal obtained from the clock frequency discriminating means. 9. The data transmission device according to claim 8, wherein any one of the plurality of additional word data groups is inserted into a portion of the compressed digital video signal where compressed data does not exist. 10. Synchronous data inserting means performs word transmission rate conversion on the compressed digital video signal according to the discrimination output signal obtained from the clock frequency discriminating means, and there is no compressed data of the compressed digital video signal. 10. The first word string data having a predetermined predetermined word transmission rate is formed by inserting any one of a plurality of additional word data groups into the first word string data. Data transmission equipment. 11. Received serial data formed by converting word string data having a portion based on an additional word data group including word synchronization data after 8-bit / 10-bit conversion having a preset code. , The serial data is converted to serial / parallel by
The additional word data group including the word synchronization data is converted into the inserted word string data, and a control signal is formed according to the word synchronization data included in the additional word data group inserted in the word string data. The word string data is subjected to 10-bit / 8-bit conversion to obtain converted word string data in which an additional word data group including word synchronization data having the preset code is inserted, and the converted word string data is subjected to the above A compressed digital format in which an additional word data group including word synchronization data having a preset code is separated, and a portion where compressed data based on a digital video signal exists and a portion where the compressed data does not exist are alternately connected. The process for obtaining the video signal is performed in a manner corresponding to the control signal, and A data receiving method for reproducing a digital video signal in which a compressed digital video signal is subjected to a data decompression process and a divided period based on the compressed data continues. 12. Serial data formed by converting word string data having a portion based on an additional word data group containing word synchronization data after 8-bit / 10-bit conversion having a preset code is received. Receiving means, serial / parallel conversion means for converting the serial data received by the receiving means into word string data in which an additional word data group including the word synchronization data is inserted, by serial / parallel conversion; Control signal forming means for forming a control signal according to word synchronization data included in the additional word data group inserted in the word string data formed by the serial / parallel converting means; and a word obtained from the serial / parallel converting means. After 10-bit / 8-bit conversion is applied to the column data, 10-bit / 8-bit conversion means for obtaining conversion word string data in which an additional word data group including word synchronization data having a set code is inserted, and a conversion word string obtained from the 10-bit / 8-bit conversion means. The additional word data group containing the word synchronization data having the preset code is separated from the data, and the portion where the compressed data based on the digital video signal exists and the portion where the compressed data does not exist are alternately connected. Based on the compressed data, the word data separating means for performing the processing for obtaining the compressed digital video signal in a manner corresponding to the control signal, and the data expansion processing for the compressed digital video signal obtained from the word data separating means. A digitizer for reproducing a digital video signal in which segmental periods are connected. And a video signal reproducing means, and a data receiving device. 13. The word data separating means separates an additional word data group containing word synchronization data having a preset code from the converted word string data in accordance with a control signal from the control signal forming means, By performing word transmission rate conversion on the converted word string data from which the additional word data group has been separated, a portion where compressed data based on a digital video signal exists and a portion where the compressed data does not exist are alternately arranged. 13. The data receiving device according to claim 12, wherein a compressed digital video signal is obtained.