JP2001127725A - Data transmission method and data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To multiplex and transmit digital image information signals such as a digital video signal and an SDTI signal by a means, which can put them in order, so that they can surely be reproduced on a reception means. SOLUTION: Plural digital image information signals are multiplexed to generate 20-bit word sequence data, which are scrambled and converted in transmission rate; and additional word data groups including 20-bit word synchronous data given predetermine codes are inserted at specific word intervals to generate composite 20-bit word sequence data, which are converted into serial data and transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application provides a multiplexing process for a plurality of digital image information signals to obtain 20-bit word string data, and obtains the obtained 20-bit word string data. To form compound 20-bit word string data by adding word synchronization data to
The present invention relates to a data transmission method for transmitting the composite 20-bit word string data for transmission, and a data transmission apparatus used for the implementation.

[0002]

2. Description of the Related Art In the field of transmission of digital signals representing various kinds of information such as image information, a digital signal representing information is converted into serial data, an electric signal based on the serial data is obtained, and the electric signal is converted into a coaxial cable or twisted. A system that transmits data through a transmission line formed using a pair line or the like, or a digital signal representing information is converted into serial data, and the serial data is converted into an optical signal, and is formed using an optical fiber. A system for transmitting data through a transmission path has been put to practical use.

On the other hand, in the field of video signals, digitization has been attempted from the viewpoint of diversifying transmitted information and improving the quality of reproduced images. High Definition Television (HDT
V) Systems and the like have been proposed. A digital video signal such as a digitized video signal under the HDTV system follows a data format as shown in FIG. 11, for example.

[0004] The data format of the digital video signal shown in FIG. 11 includes a luminance signal data sequence (Y data sequence) representing a luminance signal component in the video signal as shown in FIG. in the as shown, comprises from the color difference signal data sequence representing the color difference signal components (P _B / P _R data sequence) in the video signal, the word data forming the respective Y data sequence and P _B / P _R data sequence Each has a 10-bit configuration. That is, each of the Y data sequence and P _B / P _R data sequence is a 10-bit quantized digital signal. FIG. 11A shows a line blanking period in each line period in the Y data series and a portion corresponding to a part of the video data period before and after the line blanking period. FIG. It has been shown a portion corresponding to a portion of the video data period in the line blanking period and before and after in each line period in the P _B / P _R data sequence.

In the Y data series, immediately before a portion corresponding to each video data period, four words (3FF (Y), 000 (Y), 000) each having a 10-bit configuration.
(Y), XYZ (Y); 3FF and 000 are represented in hexadecimal, and (Y) represents a word in the Y data series. ) Timing reference code data (S
AV: Start of Active Video)
Immediately after the portion corresponding to each video data period, 10
Four words (3FF (Y), 000) having a bit configuration
(Y), 000 (Y), XYZ (Y)), the timing reference code data (EAV: End of Active Video).
) Is arranged. Similarly, even in the P _B / P _R data sequence, immediately before the portion corresponding to each video data period, 4 words (3FF (C),
000 (C), 000 (C), XYZ (C); 3FF and 000 are hexadecimal, indicating that the (C) the word in P _B / P _R data sequence. ) Consisting of
AV is arranged, and immediately after the portion corresponding to each video data period, 4 words (3FF (C), 000 (C), 000 (C), XYZ) each having a 10-bit configuration are provided.
(C)) is provided. Of course, each of the EAV and SAV in the Y data sequence is arranged in a portion corresponding to each line blanking period in the Y data sequence,
Further, each of the EAV and SAV in P _B / P _R data sequence is arranged in a portion corresponding to the line blanking period at P _B / P _R data sequence.

[0006] In such Y data sequence and P _B / P _R data sequence is transmitted, Y data sequence and P _B /
The P _R data sequence, word multiplexing process at Moto the portion corresponding to the line blanking period, each of EAV and SAV are disposed has been made to the synchronization is performed, the word multiple data series as shown in FIG. 12 , Formed as a 10-bit quantized digital signal. In the word multiplexed data series, immediately before a portion corresponding to each video data period, 8 words (3FF) each having a 10-bit configuration are used.
(C), 3FF (Y), 000 (C), 000 (Y),
000 (C), 000 (Y), XYZ (C), XYZ
(Y)) are arranged, and 10 bits are formed immediately after a portion corresponding to each video data period.
Words (3FF (C), 3FF (Y), 000 (C),
000 (Y), 000 (C), 000 (Y), XYZ
(C), XYZ (Y)) are provided.

[0007] The digital video signal in the form of a word multiplexed data series is converted, for example, from parallel data to serial data, subjected to scrambling, and transmitted in the form of a transmission signal which is converted into an electric signal or an optical signal. Is done.

Further, digital data representing image information, that is, image information data usually has a huge amount of data. For example, when the data is transmitted or recorded, the quality of the data is substantially reduced. It is desired that the data is compressed so that the data amount can be reduced without lowering the data amount. Therefore, various researches and developments have been made on data compression techniques for reducing the amount of image information data. One of the results is digital data representing image information, especially moving image information. Regarding data compression for image information data that is
Moving Picture Experts Group (MPEG), a working group under the Technical Committee under the International Standards Organization
A standard system called MPEG, which has been examined and approved as a standard, has been proposed.

In the standard system called MPEG, image information data is subjected to data compression by high-efficiency coding.
When data compression by high-efficiency encoding according to EG is performed, data compression with an extremely high compression rate can be realized.
In addition, there is an advantage that an image reproduced based on the image information data subjected to the data compression can be of high quality. Therefore, in the field of business or home electronic devices such as digital video cameras and digital video tape recorders, image information data (M
PEG image information data) tends to increase.

When transmitting compressed digital video data such as MPEG image information data and compressed digital video and audio data obtained by adding audio data to the digital data through a transmission line as serial data. As an interface developed to be used, SDTI (Serial Data Transport
Interface) has been proposed. This SD
TI is the US SMPTE (Society of Motion Pictur)
e and Television Engineers), which is standardized as "SMPTE 305M".

A signal format under the SDTI (SDTI signal format) is, for example, as shown in FIG. FIG. 13A shows one line period in the SDTI signal format at a word transmission rate of 27 MBps, and forms 10-bit word string data in which one word is composed of 10 bits. Then, for one line period, for example, 525
One frame period is formed by 525 line periods that are connected in series.

For one line period shown in FIG. 13A, the timing reference code data: EAV (End of
Active Video) and ancillary data (Ancillar
y Data) section and timing reference code data: SAV (S
tart of Active Video), followed by the payload section. EAV and SAV, respectively,
Four words (3FF, 000,000, XYZ; hexadecimal notation (the same applies hereinafter)) having the same word structure and each having a 10-bit structure are sequentially arranged. The auxiliary data section includes header data. In the payload part, user data and an error detection code: CR
C is arranged.

[0013] The header data included in the auxiliary data section is, for example, as shown in FIG.
, An auxiliary signal flag consisting of three words (000, 3FF, 3FF): ADF, followed by data identification: DID, second data identification: SDID, data count: DC, line number: LN0, line number : LN
1, line number error detection code: LNCRC0, line number error detection code: LNCRC1, code and authorized address identification: C & AAI, 16 word destination address, 16 word source address, block type: BT, payload error detection code flag: CRCFL, spare data for header extension: RSV0 to RSV4, header error detection code: HDCRC0, header error detection code: HDCRC1,
Check sum: CS is sequentially arranged. Such header data is composed of a total of 53 words.

An SDT used for transmitting compressed digital video data or video and audio data.
A digital signal (hereinafter, referred to as an SDTI signal) formed in accordance with the I signal format is converted, for example, from parallel data to serial data, and is usually subjected to scrambling processing to form a transmission signal that is converted into an electric signal or an optical signal. Is transmitted.

The Y data sequence and P _B / P _{R as} described above
A digital video signal in the form of a data sequence or a word multiplexed data sequence, and further, an SDTI signal are all included in the digital image information signal. In the scrambling process performed when such digital image information signal is transmitted as serial data, the serial data to be subjected to the scrambling is represented by a polynomial. The following primitive polynomial: sequentially divide by X ⁹ + X ⁴ +1 to obtain a quotient, which is the operation result, as transmission data, and statistically mark the transmission data (the ratio between “0” and “1”). Is reduced to １ ／ on average, and the transmission data is encrypted by a primitive polynomial. In actual transmission of transmission data, for example, instead of directly transmitting a quotient obtained by division by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1, the quotient is further divided by an expression: X + 1. The transmission data is data (polarity-free data) in which it and the inverted data have the same information.

On the receiving side receiving the transmission data, the received transmission data is multiplied by the formula: X + 1, and further, is multiplied by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 to perform a descrambling process. Plays back serial data.

[0017]

In the digital video signal taking [0008] described above in the Y data sequence and P _B / P _R data sequence or word multiple data sequence, when the transmission, for a single digital video signal only However, if a plurality of digital video signals can be multiplexed and transmitted so that they can be reliably reproduced on the receiving side, efficient use of the digital video signals can be achieved.
The use range of the digital video signal is expanded. Similarly, even in the case of the above-mentioned SDTI signal, not only a single SDTI signal but also a plurality of SDTI signals are multiplexed and transmitted so as to be surely reproduced on the receiving side upon transmission through the transmission path. If possible, the SDTI signal can be used efficiently, and furthermore,
The use range of the SDTI signal is expanded.

And a digital video signal or SD
Efficient use of the TI signal or expansion of the range of use of the digital video signal or the SDTI signal, for example, leads to further development of technology in the field of business or home electronic devices. Therefore, from such a point of view, it is desired to provide a method capable of multiplexing and transmitting a plurality of digital video signals or SDTI signals so that the digital video signals or SDTI signals can be reliably reproduced on the receiving side by means that can be prepared relatively easily. Become.

However, in the related art, digital image information signals such as digital video signals and SDTI signals as described above are multiplexed and transmitted so that a plurality of them can be reliably reproduced on the receiving side. There is no concrete example that has realized a possible transmission system. Also,
There is also no literature describing a technique relating to a transmission system capable of multiplexing and transmitting such a plurality of digital image information signals so that they can be reliably reproduced on the receiving side.

[0020] In view of the above, the invention described in the claims of the present application provides, for example, the aforementioned Y data series and P data.
_B / P _R data sequence or digital video signal in the form of a word multiple data sequence, the digital image information signal such as SDTI signals, with means which can adjust relatively easily, reliably reproduce these plurality at the receiving side Provided is a data transmission method capable of multiplexing and transmitting the data and a data transmission apparatus provided for implementing the method.

[0021]

A data transmission method according to the invention described in any one of claims 1 to 12 in the claims of the present application performs a multiplexing process on a plurality of digital image information signals. To form a 20-bit word string data, perform scramble processing on the 20-bit word string data, perform transmission rate conversion processing, and provide a predetermined code at predetermined word intervals. An additional word data group including the 20-bit word synchronization data is inserted to form composite 20-bit word string data, the formed composite 20-bit word string data is converted to serial data, and the serial data is transmitted. It is to be transmitted.

In particular, in the data transmission method according to the second aspect of the present invention, the additional word data group is divided into a plurality of 20-bit word data to which a predetermined code is assigned. Are selected as those containing 20 bits word synchronization data.

In the data transmission method according to the invention described in claim 3 of the present application, a plurality of digital image information signals are converted into a plurality of digital image information signals according to a predetermined signal format. digital video signal, for example, is intended to select a plurality of Y data sequence and P _B / P _R data sequence or digital video signal in the form of a word multiple data sequence, also claimed in the claims of the present application claim 8 In the data transmission method according to the invention described in (1), a plurality of digital image information signals are formed by a plurality of digital signals formed according to a specific signal format used for transmitting compressed digital video data or video and audio data. For example, a plurality of SDTI signals are selected.

Furthermore, the data transmission apparatus according to the invention described in claim 13 in the claims of the present application, a plurality of digital video signals, for example, a plurality of Y data sequence and P _B / P _R data sequence or word 20-bit word string data forming means for performing multiplexing processing on a digital video signal in the form of a multiplex data sequence to form 20-bit word string data; and 20-bit word string data obtained from the 20-bit word string data forming means Processing means for performing scrambling processing on the scrambled data, and scrambled processing means 2
A transmission rate conversion process is performed on the 0-bit word string data, and an additional word data group including 20-bit word synchronization data to which a predetermined code is given is inserted at a predetermined word interval. Composite data forming means for forming 20-bit word string data, and data transmitting means for converting composite 20-bit word string data obtained from the composite data forming means into serial data and transmitting the serial data for transmission It is composed.

Further, the data transmission apparatus according to the invention described in claim 14 of the present application is a data transmission apparatus capable of transmitting a compressed digital video data or a specific signal format used for transmitting video and audio data. A 20-bit word string data forming means for multiplexing a plurality of digital signals, for example, a plurality of SDTI signals, to form 20-bit word string data; Scrambling processing means for performing scrambling processing on the obtained 20-bit word string data, and performing transmission rate conversion processing on the scrambled 20-bit word string data obtained from the scrambling processing means, and at predetermined word intervals. A 20-bit word given a predetermined code Compound data forming means for forming compound 20-bit word string data by inserting an additional word data group including initial data, and converting compound 20-bit word string data obtained from the compound data forming means into serial data; Data transmission means for transmitting the serial data for transmission.

In the data transmission method according to any one of the first to twelfth aspects of the present invention, the data is transmitted after being converted into serial data. The transmitted composite 20-bit word string data based on a plurality of digital image information signals includes 20-bit word synchronization data to which a predetermined code is given. Such 20-bit word synchronization data is, for example, a plurality of 20-bit words to which a predetermined code is assigned as in the data transmission method according to the invention described in claim 2 of the present application. Data is selected to be continuous with a specific sequence. Then, the 20-bit word string data included in the composite 20-bit word string data together with the 20-bit word synchronization data is assumed to have been subjected to scramble processing. On the receiving side that receives serial data based on word string data,
Composite 20 obtained based on received serial data
This is properly detected as word synchronization data required for processing for reproducing a plurality of digital image information signals from bit word string data. Therefore, on the receiving side, a state is ensured in which the data synchronization state required for the reproduction processing of a plurality of digital image information signals based on the received composite 20-bit word string data is reliably obtained. You.

Each of the plurality of digital image information signals is, for example, a Y data series and a P data _B / P _R data series or a as a digital video signal in the form of a word multiple data sequence, a plurality of the digital video signal which is to be accorded the predetermined signal format,
Alternatively, each is a plurality of digital signals formed according to a specific signal format used for transmitting compressed digital video data or video and audio data, such as SDTI signals.

In the data transmission method according to any one of the first to twelfth aspects of the present invention, a predetermined code is provided. Conversion of 20-bit word string data to which bit-word synchronization data has been added into serial data, transmission of the converted serial data, reception of serial data on the receiving side, and 20-bit word string of received serial data Conversion to data, etc.
For example, the transmission can be performed using a transmission circuit device used for transmitting and receiving a digital video signal under an HDTV system. Therefore, according to the data transmission method according to the invention described in claim 1 in the scope of the appended claims to claim 12, Y data sequence and P _B / P _R data sequence or word multiplexed data sequence Digital video signal in the form of
For digital image information signals such as DTI signals,
By means that can be arranged relatively easily, a plurality of these can be multiplexed and transmitted so as to be surely reproduced on the receiving side.

Further, in the data transmission apparatus according to the invention described in claim 13 of the present application, a plurality of digital data transmitted to be transmitted after being converted into serial data by the data transmitting means. The composite 20-bit word string data based on the video signal includes 20-bit word synchronization data to which a predetermined code is given, and such 20-bit word synchronization data includes, for example, a predetermined code. A plurality of 20-bit word data to which the assignment has been made is selected to be continuous with a specific arrangement. The 20-bit word string data included in the composite 20-bit word string data together with the 20-bit word synchronization data is assumed to have been subjected to scramble processing by the scramble processing means.
On the receiving side receiving the serial data based on the composite 20-bit word string data including the 0-bit word synchronization data, a plurality of digital video signals are converted from the composite 20-bit word string data obtained based on the received serial data. It is properly detected as word synchronization data required for processing for reproduction, and therefore, on the receiving side, a plurality of digital video signals based on the received composite 20-bit word string data A state in which the data synchronization state required for the reproduction processing of the data is reliably obtained.

According to the data transmission apparatus of the invention described in claim 13 of the present application, a 20-bit word synchronous data to which a predetermined code is given is added. Conversion of bit word string data to serial data, transmission of the converted serial data, and reception of serial data at the receiving side, conversion of received serial data to 20-bit word string data, and the like, for example, can be performed over a transmission circuit devices used in the transmission and reception of digital video signals in the original HDTV system, therefore, as a digital video signal in the form of a Y data sequence and P _B / P _R data sequence Of digital video signals of So that can transmit raw movable to and multiplexed.

Further, in the data transmission apparatus according to the invention described in claim 14 of the present application, the data transmission means converts the data to serial data and transmits the serial data. SD
The composite 20-bit word string data based on a plurality of digital signals, which is a TI signal, includes 20-bit word synchronization data to which a predetermined code is given, and such 20-bit word synchronization data includes: For example, a plurality of 20-bit word data to which a predetermined code is assigned is selected to be continuous with a specific arrangement. Since the 20-bit word string data included in the composite 20-bit word string data together with the 20-bit word synchronization data has been subjected to scramble processing by the scramble processing means, the 20-bit word synchronization data contains the same. On the receiving side receiving the serial data based on the composite 20-bit word string data, a word required for processing for reproducing a plurality of SDTI signals from the composite 20-bit word string data obtained based on the received serial data Synchronous data is to be properly detected, and therefore, on the receiving side, reproduction of a plurality of digital signals such as a plurality of SDTI signals based on the received composite 20-bit word string data. A state where data synchronization status required for processing can be reliably obtained. It is ensured.

According to such a data transmission apparatus according to the present invention as set forth in claim 14 of the present application, a composite in which 20-bit word synchronous data to which a predetermined code is given is added. Conversion of the 20-bit word string data to serial data, transmission of the converted serial data, and further, reception of the serial data, conversion of the received serial data to composite 20-bit word string data on the receiving side, and the like. For example, it can be performed by using a transmission circuit device used for transmitting and receiving a digital video signal under an HDTV system, and thus can be used for transmitting compressed digital video data or video and audio data such as an SDTI signal. A digital signal that conforms to the specific signal format used for transmission For it, with means which can adjust relatively easily, the plurality securely so that it can be transmitted by being multiplexed to be reproduced on the receiving side.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an example of a data transmission method according to the present invention described in any one of claims 1 to 4, 6 and 7 in the claims of the present application. An example of the data transmission device according to the invention described in claim 13 in the claims will be described.

In the example shown in FIG.
Digital video signals DVP1, DVP2, DVP3, DVP4, and DVP5, which are digital image information signals of channels, are supplied to a 20-bit word string data forming unit 11. 5 channel digital video signal DVP1
~DVP5 each are multiplex processing to the Y data sequence and P _B / P _R data sequence shown in A and B of Figure 11 is formed is subjected to the word multiple data format as shown in FIG. 12 This is a corresponding 10-bit quantized digital signal. Therefore, the digital video signals DVP1 to DVP
The VP5 is parallel data in which each word is composed of 10 bits and the word transmission rate is, for example, 27 MBps, and the VP5 is word-synchronized with each other. You.

In the 20-bit word string data forming unit 11, digital video signals DVP1 to DVP1
The DVP 5 is subjected to a multiplexing process of sequentially taking out, for example, 1 word = 10 bits as 10-bit data and multiplexing them from each of the DVPs 5 with the line synchronization period portion and the field synchronization period portion aligned. Thereby, 20-bit word string data DVP (20) having a word transmission rate of, for example, 67.5 MBps is formed. The 20-bit word string data DVP (20) obtained from the 20-bit word string data forming unit 11 is supplied to the scramble processing unit 12.

The scramble processor 12 scrambles the 20-bit word string data DVP (20) formed by multiplexing the digital video signals DVP1 to DVP5 of five channels. Such scrambling processing is performed, for example, by converting 20 bits of 20-bit word string data DVP (20) into 20 words per word.
Bit data is sequentially extracted and converted into serial data, and the 20-bit data is converted into a ninth-order primitive polynomial: X ⁹ +
X ⁴ +1 and further dividing by the formula: X + 1,
This is performed by forming 20-bit word string data based on the bit data sequentially obtained. As a result, from the scramble processing unit 12, the scrambled 20-bit word string data DVSC (2
0) is obtained and supplied to the composite data forming unit 13.

In the composite data forming unit 13, the 20-bit word string data DV from the scramble processing unit 12
SC (20) is supplied to the speed conversion / data insertion unit 14. In addition, the speed conversion / data insertion unit 14 receives a plurality of 2 bits including 20-bit word synchronization data to which a predetermined code has been assigned from the word data transmission unit 15.
An additional word data group DWT composed of 0-bit word data is supplied.

In the rate conversion / data insertion unit 14, the word transmission rate is set to 67.5 MBps.
For the bit word string data DVSC (20), the word transmission rate is, for example, from 67.5 MBps to 7
While performing speed conversion to convert to 4.25 MBps,
At a predetermined word interval, an additional word data group DWT including the 20-bit word synchronization data from the word data transmitting unit 15 is inserted, and based on the digital video signals DVP1 to DVP5 of five channels,
The compound 20-bit word string data DVZ (20) having a word transmission rate of, for example, 74.25 MBps is formed.

FIG. 2 shows a specific configuration example of the speed conversion / data insertion unit 14. In the example shown in FIG. 2, digital video signals DVP1 to DVP of five channels are provided.
20-bit word string data DVSC (20) obtained based on VP5 and subjected to scramble processing is supplied to the switch 20. The switch 20 performs switching every predetermined period, for example, every 1 ms in response to the control signal CSA from the switch control signal forming unit 21.
The 20-bit word string data DVSC (20) is transmitted for 1 ms
The data is alternately supplied to the memory unit 22 and the memory unit 23 every interval, and the 20-bit word string data DVSC (20) is distributed to the memory unit 22 and the memory unit 23.

A memory control signal forming unit 24 is provided in association with the memory unit 22 and the memory unit 23.
The memory control signal forming unit 24 includes, for example, a clock signal CA having a frequency of 27 MHz synchronized with the clock signal in each of the digital video signals DVP1 to DVP5 of five channels and a clock signal CB having a frequency of 74.25 MHz. Supplied. Then, the memory control signal forming unit 24 generates a write control signal QW having a frequency of 27 MHz × 5/2 = 67.5 MHz based on the clock signal CA, and changes the frequency based on the clock signal CB. A read control signal QR at 74.25 MHz is generated, and the write control signal QW and the read control signal QR are supplied to both the memory unit 22 and the memory unit 23.

Thus, in the memory section 22, the 20-bit word string data DVSC
In the period in which (20) is supplied, the 20-bit word string data DVSC (20) has a frequency of 67.5 MHz.
The word transmission speed is set to 6 according to the write control signal QW
The data is written in a state of 7.5 MBps. Also in the memory unit 23, during the period in which the 20-bit word string data DVSC (20) is supplied through the switch 20, the 20-bit word string data DVSC (20) is
In response to a write control signal QW having a frequency of 67.5 MHz, writing is performed in a state where the word transmission rate is 67.5 MBps. Accordingly, the 20-bit word string data DVSC (2
Writing in a state where the word transmission rate of 0) is set to 67.5 MBps is performed alternately for 1 ms in accordance with the switching of the switch 20 every 1 ms.

The 20-bit word string data DVSC (20) written into the memory section 22 for 1 ms corresponds to a read control signal QR having a frequency of 74.25 MHz during the next 1 ms. , Word transmission speed 7
20-bit word string data DV with 4.25 MBps
SC ′ (20) is read from the memory unit 22 and supplied to the switch 25. The 20-bit word string data DVS written in the memory unit 23 for 1 ms
C (20) also changes the frequency to 7 in the next 1 ms.
In response to the read control signal QR of 4.25 MHz, the data is read from the memory unit 23 as 20-bit word string data DVSC ′ (20) having a word transmission rate of 74.25 MBps and supplied to the switch 25. The switch 25 is also supplied with the additional word data group DWT from the word data transmission unit 15. The additional word data group DWT has a word transmission rate of 74.25 MBps.

The switch 25 reads an additional word data group DWT from the word data transmitting section 15 at a word transmission rate of 74.25 MBps and the memory section 22 in response to the control signal CSB from the switch control signal forming section 21. 20-bit word string data DVSC '(20) with a word transmission rate of 74.25 MBps, and
The word transmission speed read from the memory unit 23 is set to 74.
20-bit word string data DVS with 25 MBps
Each of C ′ (20) is sequentially extracted for a predetermined word period. Thus, the switch 25 adds the word transmission rate of 74.25 MBps to the 20-bit word string data DVSC '(20) whose word transmission rate is converted to 74.25 MBps at a predetermined word interval. Composite 20 formed by insertion of DWT
Bit word string data DVZ (20) is derived.

Word transmission from word data transmission section 15
Additional word data glue with speed of 74.25 MBps
Open DWT is provided with a predetermined code 20
Multiple 20-bit words containing bit word synchronization data
20-bit word synchronization data
The data is, for example, a Y data system as shown in FIG.
10 bits of EAV or SAV included in the column
Word data 3FF (Y), 000 (Y) and 000
(Y) and P as shown in FIG._B/ P _RDay
10 of EAV or SAV included in the data sequence
Word data 3FF (C), 000 (C) and 00
0 (C), which is 3 words formed based on
FF: 3FFh, 000,000: 000h and 00000: 000
h are sequentially arranged. 3FF: 3FF
h is 10-bit word data 3FF (Y) and 3FF
(C) is bit-multiplexed into 20-bit word data.
H is in hexadecimal notation
You. Also, 000: 000h is 10-bit word data
Data 000 (Y) and 000 (C) are bit-multiplexed and 2
0-bit word data, where h is hexadecimal
Indicates that it is a display.

The additional word data group DWT having a word transmission rate of 74.25 MBps from the word data transmission unit 15 includes three 20-bit word data 3FF: 3FFh, which are 20-bit word synchronous data.
000: 000h and 000000: h, and the other two
And 0-bit word data.

Such an additional word data group DWT
Is, in one specific example, three consecutive 20-bit word data 3 which are 20-bit word synchronization data.
FF: 3FFh, 000,000: 000h and 00000: 000
Prior to h, arbitrary 20-bit word data DX is to be arranged. In the composite 20-bit word string data DVZ (20) formed by inserting such an additional word data group DWT, the portion into which the additional word data group DWT is inserted is, for example, as shown in FIG. You. 3. In FIG. 3, DM is the 20 read from each of the memory units 22 and 23 shown in FIG.
20 forming bit word string data DVSC '(20)
DX represents bit word data, DX represents arbitrary 20-bit word data, and arrow t represents the passage of time.

The additional word data group DWT
In another example of the specific example, three consecutive 20-bit word data 3FF: 3FFh, 0,000,000: 000h and 000: 0 which are 20-bit word synchronization data.
An arbitrary 20-bit word data DX is arranged before and after 00h. The composite 20-bit word string data DVZ (20) formed by inserting such an additional word data group DWT has a portion where the additional word data group DWT is inserted, for example, as shown in FIG. You. 4, DM also represents 20-bit word data forming 20-bit word string data DVSC ′ (20) read from each of the memory units 22 and 23 shown in FIG. 2, and DX represents Represents arbitrary 20-bit word data.
Arrow t indicates the passage of time.

As described above, the composite 20-bit word string data DVZ (20) formed in the speed conversion / data insertion section 14 is sent from the composite data forming section 13 and is converted into parallel / serial (P / S). It is supplied to the converter 16. The P / S converter 16 performs P / S conversion on the composite 20-bit word string data DVZ (20) to convert parallel data into serial data, and
The serial data DVS is formed based on the bit word string data DVZ (20), and the serial data DVS is supplied to the transmission signal forming unit 17. The transmission signal forming unit 17
To transmit the serial data DVS through, for example, a data transmission line formed using a coaxial cable or an optical fiber, an electric signal suitable for the data transmission line formed using a coaxial cable, or an optical signal The signal is converted into a transmission signal SV which is an optical signal suitable for a data transmission path formed using a fiber, and transmitted. Thereby, the serial data DVS
Is transmitted.

As described above, scramble processing is performed on the 20-bit word string data DVP (20) based on the 5-channel digital video signals DVP1 to DVP5 to form 20-bit word string data DVSC (20). In the scrambled 20-bit word string data DVSC (20), three consecutive 20-bit word data 3
FF: 3FFh, 000,000: 000h and 00000: 000
h is added to form a composite 20-bit word string data DVZ (2
0) is converted to serial data DVS and transmitted. At this time, the scrambled 2
The 0-bit word string data DVSC (20) is composed of three consecutive 20-bit word data 3 which are 20-bit word synchronization data generated due to the scrambling process.
FF: 3FFh, 000,000: 000h and 00000: 000
h, the 20-bit word string data DV
There is no point in inserting the 20-bit word synchronization data into the SC (20).

The scrambled 20-bit word string data DVSC (20) is converted into three consecutive 20-bit word data 3FF: 3FFh, 000000h and 00: 00h, which are 20-bit word synchronization data.
0h, the scramble processing unit 1
2, the 20-bit word string data DVP (20)
, 20 bits of data are sequentially extracted from the input data and converted into serial data. Each of the 20 bits of data is divided by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further divided by the expression: X + 1 to obtain bit data sequentially obtained. , Six consecutive 10-bit word data 3FFh, 3FFh, 000
A portion corresponding to the data obtained by converting h, 000h, 000h, and 000h into serial data appears.
That is, in the scramble processing section 12, six consecutive 10-bit data are obtained by performing division by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further dividing by the expression: X + 1. Word data 3FF
h, 3FFh, 000h, 000h, 000h and 00
It is a problem whether or not a portion corresponding to 0h converted into serial data appears. In this regard, such portions will not appear substantially for the following reasons.

First, in the bit data obtained by performing the division by the ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and the division by the expression: X + 1 obtained in the scramble processing unit 12, m is an integer of 20 or more. When n is an integer of 40 or more, assuming that there is a portion where m-bit “1” is continuous and n-bit “0” is continuous, a ninth-order primitive polynomial of the portion: X ⁹ + X ⁴ +1 The original data before the division by X and the division by X + 1 is performed, A (X) and B (X) are arbitrary data, and A (X): m-bit continuous “1”: n-bit A sequence of “0”: a sequence of B (X) multiplied by a formula: X + 1 and a ninth-order primitive polynomial: X ⁹ + X ⁴ +1.
[A (X): m bits of “1” continuation: n bits of “0” continuation: B (X)] × (X + 1) × (X ⁹ + X ⁴
+1) = [A (X): m-bit “1” continuation: n-bit “0” continuation: B (X)] × G (X), where G
(X) = (X + 1) × (X ⁹ + X ⁴ +1)).

In the data expressed as [A (X): continuous m bits of “1”: continuous n bits of “0”: B (X)] × G (X), [m (1) 1 "
× G (X) is [continuation of m-bit “1”] ×
(X + 1) = 10 ... 01 (where 0 ... 0 is m
(Continuation of −1 bit “0”) = X ^m +1 and (X
^m + 1) × (X ⁹ + X ⁴ +1) = (X ⁹ + X ⁴ +1) ×
X ^m + (X ⁹ + X ⁴ +1), so [A
(X): m bits of “1” continuation: n bits of “0” continuation: B (X)] × G (X) is UUUUUUUUU
Is 10 bits where the result of A (X) × G (X) is added, and VVVVVVVVVVV is 10 bits where the result of B (X) × G (X) is added.
00010 ******** 01000000100010 ///
// 0 (where 0 **** is a continuation of m-10-bit "0" and 0 //// 0 is a continuation of n-bit "0"). UUUUUUU is assigned to the upper 10 bits.
UUU is added and the lower 10 bits are VVVVVV
VVVV is added.

Thus, a ninth-order primitive polynomial: X ⁹ + X
^{In the} bit data obtained by performing the division by ⁴ + 1 and the division by the formula: X + 1, if there is a portion where m-bit "1" is continuous and n-bit "0" is continuous, the portion of the bit is obtained. 9th-order primitive polynomial: X ⁹ + X
^In the original data before the division by ⁴ + 1 and the division by the formula: X + 1, the first "0" sequence is m-10 bits, and the last "0" sequence is n bits. Will be. However, such first "0"
Is a sequence of m-10 bits, and the sequence of the last "0" is n.
Bit data is sequentially multiplexed by extracting 10 bits from each of the digital video signals DVP1 to DVP5 of 5 channels in a state where the line synchronization period portion and the field synchronization period portion are aligned. This does not appear in the data obtained by converting the 20-bit word string data DVP (20) obtained by performing the multiplexing processing into serial data.

Accordingly, in the scramble processing unit 12, six consecutive 10-bit word data are obtained as bit data obtained by performing division by the ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and division by the expression: X + 1. 3FF
h, 3FFh, 000h, 000h, 000h and 00
No portion corresponding to the data obtained by converting 0h to serial data does not appear. As a result, the scrambled 20-bit word string data DVSC (20)
Is three consecutive 20-bit word data 3FF: 3FFh, 000: 0, which are 20-bit word synchronous data.
00h and 000: 000h are not included.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S conversion section 16 and the transmission signal forming section 1
7 converts the composite 20-bit word string data having a word transmission rate of 74.25 MBps to a bit transmission rate of 7
Since the data is converted into serial data of 4.25 MBps × 20 = 1.485 Gbps and transmitted, such a P / S conversion unit 16 and a transmission signal forming unit 17 are provided, for example, in a digital format under an HDTV system. An integrated circuit (IC) element provided for transmitting a video signal can be effectively used. Thus, each is a Y data sequence and P _B / P _R 10-bit quantized digital signal multiplexing process according to the word multiple data format formed by being subjected to the data sequence, the 5-channel digital video signal DVP1 DVP5 multiplex transmission is relatively easy without requiring the development of new circuit elements and the like, assuming that the data synchronization state required for reproduction processing on the receiving side can be reliably obtained by 20-bit word synchronization data. It can be done by means that can be arranged in a timely manner.

[0056] Further, in the data transmission apparatus shown in FIG. 1 described above, according to the word multiple data formats, each multiplexing processing is formed is subjected to a Y data sequence and P _B / P _R data sequence The five-channel digital video signals DVP1 to DVP5, which are parallel data which are 10-bit quantized digital signals, are supplied to the 20-bit word string data forming unit 11, but the five-channel digital video signals DVP1 to DVP5 are provided. Instead, as in the data transmission method according to the invention described in claim 5 of the present application, for example, a plurality of digital video signals DVP1 to DVP5 each having a 10-bit quantized digital signal. A plurality of channels obtained by serially transmitting each of the digital video signals of the channels Digital video signal which is serial data of Le may be adapted to be supplied to the 20-bit word sequence data forming unit corresponding with Moto mutual bit synchronization has taken 20-bit word sequence data forming unit 11. At that time, 20-bit word string data based on digital video signals of a plurality of channels, each of which is converted into serial data, is formed and transmitted.

FIG. 5 shows an example of a data transmission method according to the invention of any one of claims 1, 2, 8, 9, 11, and 12 in the claims of the present application. An example of the data transmission device according to the invention described in claim 14 in the claims is shown.

In the example shown in FIG.
Channel SDTI signals DTIP1, DTIP2, D
TIP3, DTIP4, and DTIP5 are supplied to the 20-bit word string data forming unit 31. Each of the five channels of SDTI signals DTIP1 to DTIP5 is shown in FIG.
A and B are 10-bit quantized digital signals that are 10-bit word string data in accordance with the SDTI signal format, and are parallel data having a word transmission rate of, for example, 27 MBps, The words are mutually synchronized.

In the 20-bit word string data forming section 31, five channels of SDTI signals DTIP1 to DTIP are provided.
The IP5 is subjected to a multiplexing process of sequentially extracting and multiplexing, for example, 1 word = 10 bits as 10-bit data from each of the IP5s with the line synchronization period portion and the field synchronization period portion aligned. Thus, 20-bit word string data DTP (20) having a word transmission rate of, for example, 67.5 MBps is formed. The 20-bit word string data DTP (20) obtained from the 20-bit word string data forming unit 31 is supplied to the scramble processing unit 32.

The scramble processor 32 scrambles the 20-bit word string data DTP (20) formed by multiplexing the 5-channel SDTI signals DTIP1 to DTIP5. Such scrambling processing is, for example, sequentially taking out 20 bits of 1 word = 20 bits as 20-bit data from the 20-bit word string data DTP (20) and converting it into serial data.
The 20-bit data is converted into a ninth-order primitive polynomial: X ⁹ + X ⁴
This is performed by dividing by +1, further dividing by the formula: X + 1, and forming 20-bit word string data based on the bit data sequentially obtained thereby. As a result, from the scramble processing unit 32, the word transmission rate is set to, for example, 67.5 MBps, and the scrambled 20-bit word string data DTSC (2
0) is obtained and supplied to the composite data forming unit 33.

In the composite data forming unit 33, the 20-bit word string data DT from the scramble processing unit 32
The SC (20) is supplied to the speed conversion / data insertion unit. In addition, the speed conversion / data insertion unit 34 receives a plurality of 2 bits including 20-bit word synchronization data to which a predetermined code is assigned from the word data transmission unit 35.
An additional word data group DWT composed of 0-bit word data is supplied.

Then, in the rate conversion / data insertion section 34, the word transmission rate is set to 67.5 MBps.
For the bit word string data DTSC (20), the word transmission rate is, for example, from 67.5 MBps to 7
While performing speed conversion to convert to 4.25 MBps,
At a predetermined word interval, an additional word data group DWT including the 20-bit word synchronization data from the word data transmission unit 35 is inserted, and thereby the word transmission rate based on the 5-channel SDTI signals DTIP1 to DTIP5 is reduced. For example, composite 20-bit word string data DTZ (20) of 74.25 MBps is formed.

FIG. 6 shows a specific configuration example of the speed conversion / data insertion unit 34. In the example shown in FIG. 6, SDTI signals DTIP1-DTI of five channels are provided.
P5 and scrambled 2
0 bit word string data DTSC (20) is
0 is supplied. The switch 40 performs switching every predetermined period, for example, every 1 ms according to the control signal CSA from the switch control signal forming unit 41,
20-bit word string data DTSC (20) is transmitted for 1 ms
The data is alternately supplied to the memory unit 42 and the memory unit 43 every interval, and the 20-bit word string data DTSC (20) is distributed to the memory unit 42 and the memory unit 43.

A memory control signal forming section 44 is provided in association with the memory section 42 and the memory section 43.
The memory control signal forming unit 44 is supplied with, for example, a clock signal CA having a frequency synchronized with the clock signal in each of the five channels of SDTI signals DTIP1 to DTIP5 of 27 MHz and a clock signal CB having a frequency of 74.25 MHz. Is done. Then, the memory control signal forming unit 44 generates a write control signal QW having a frequency of 27 MHz × 5/2 = 67.5 MHz based on the clock signal CA, and changes the frequency based on the clock signal CB. Read control signal Q at 74.25 MHz
R, and supplies the write control signal QW and the read control signal QR to both the memory unit 42 and the memory unit 43.

Thus, in the memory section 42, the 20-bit word string data DTSC
In the period during which (20) is supplied, the 20-bit word string data DTSC (20) has a frequency of 67.5 MHz.
The word transmission speed is set to 6 according to the write control signal QW
The data is written in a state of 7.5 MBps. Also in the memory unit 43, during the period in which the 20-bit word string data DTSC (20) is supplied through the switch 40, the 20-bit word string data DTSC (20) is
In response to a write control signal QW having a frequency of 67.5 MHz, writing is performed in a state where the word transmission rate is 67.5 MBps. Therefore, the 20-bit word string data DTSC (2
Writing in a state in which the word transmission rate of 0) is 67.5 MBps is performed alternately for 1 ms in accordance with the switching of the switch 40 every 1 ms.

The 20-bit word string data DTSC (20) written in the memory section 42 for 1 ms is read out during the next 1 ms in accordance with the read control signal QR having a frequency of 74.25 MHz. , Word transmission speed 7
20-bit word string data DT at 4.25 MBps
SC ′ (20) is read from the memory unit 42 and supplied to the switch 45. Also, the 20-bit word string data DTS written in the memory unit 43 for 1 ms
C (20) also changes the frequency to 7 in the next 1 ms.
In response to the read control signal QR at 4.25 MHz, the data is read from the memory unit 43 as 20-bit word string data DTSC ′ (20) having a word transmission rate of 74.25 MBps and supplied to the switch 45. The switch 45 is also supplied with the additional word data group DWT from the word data transmission unit 35. The additional word data group DWT has a word transmission rate of 74.25 MBps.

The switch 45 reads the data from the additional word data group DWT and the memory 42 that make the word transmission speed from the word data transmitter 35 74.25 MBps according to the control signal CSB from the switch control signal generator 41. 20-bit word string data DTSC '(20) having a word transmission rate of 74.25 MBps, and
The word transmission rate read from the memory unit 43 is set at 74.
20-bit word string data DTS with 25 MBps
Each of C ′ (20) is sequentially extracted for a predetermined word period. Thus, the switch 45 adds the additional word data group having the word transmission rate of 74.25 MBps to the 20-bit word string data DTSC '(20) converted to the word transmission rate of 74.25 MBps at a predetermined word interval. Composite 20 formed by insertion of DWT
Bit word string data DTZ (20) is derived.

The additional word data group DWT having a word transmission rate of 74.25 MBps from the word data transmission unit 35 is composed of the word data transmission unit 15 shown in FIG.
The example is similar to the additional word data group DWT including the 20-bit word synchronization data sent out from the PDP. One of the specific examples is three consecutive 20-bit words 3FF: 3FFh which are 20-bit word synchronization data. , 0
Prior to 00: 000h and 000000h, arbitrary 20-bit word data DX is to be arranged,
Another specific example is that three consecutive 20-bit words 3FF: 3F which are 20-bit word synchronous data.
Arbitrary 20-bit word data DX is arranged before and after Fh, 000: 000h and 000: 000h.

Such an additional word data group DW
T is inserted, and the composite 20-bit word string data DTZ (20) is formed by the additional word data group D
The portion where the WT is inserted is, for example, as shown in FIG. 3 or as shown in FIG.

As described above, the composite 20-bit word string data DTZ (20) formed in the speed conversion / data insertion section 34 is sent out from the composite data formation section 33 and supplied to the P / S conversion section 36. Is done. P / S converter 3
6, the composite 20-bit word string data DTZ
(20) is subjected to P / S conversion to obtain serial data DT based on composite 20-bit word string data DTZ (20).
S is formed, and the serial data DTS is supplied to the transmission signal forming unit 37. The transmission signal forming unit 37 is suitable for a data transmission path formed by using a coaxial cable so as to transmit the serial data DTS through, for example, a data transmission path formed by using a coaxial cable or an optical fiber. The signal is converted into an electric signal or a transmission signal ST which is an optical signal suitable for a data transmission path formed by using an optical fiber and transmitted. Thereby, transmission of the serial data DTS is performed.

As described above, the 5-channel SDT
The 20-bit word string data DTP (20) based on the I signals DTIP1 to DTIP5 is scrambled to form 20-bit word string data DTSC (20), and the scrambled 20-bit word string data DTSC ( 20), three consecutive 20-bit word data 3F, which are 20-bit word synchronous data,
F: 3FFh, 00000: 000h and 000: 000h
20 bit word string data DTZ (2) formed by inserting an additional word data group DWT including
0) is converted to serial data DTS and transmitted. At this time, the scrambled 2
The 0-bit word string data DTSC (20) is three consecutive 20-bit word data 3 which is 20-bit word synchronization data generated due to the scrambling process.
FF: 3FFh, 000,000: 000h and 00000: 000
h, the 20-bit word string data DT
There is no point in inserting the 20-bit word synchronization data into the SC (20).

The scrambled 20-bit word string data DTSC (20) is converted into three consecutive 20-bit word data 3FF: 3FFh, 000000h and 00: 00h, which are 20-bit word synchronous data.
0h, the scramble processing unit 3
2, the 20-bit word string data DTP (20)
, 20 bits of data are sequentially extracted from the input data and converted into serial data. Each of the 20 bits of data is divided by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further divided by the expression: X + 1 to obtain bit data sequentially obtained. , Six consecutive 10-bit word data 3FFh, 3FFh, 000
A portion corresponding to the data obtained by converting h, 000h, 000h, and 000h into serial data appears.
That is, in the scramble processing unit 32, division by the ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and, in addition, division by the expression: X + 1, the bit data obtained by performing six consecutive 10-bit data Word data 3FF
h, 3FFh, 000h, 000h, 000h and 00
It is a problem whether or not a portion corresponding to 0h converted into serial data appears. In this regard, such portions will not appear substantially for the following reasons.

First, in the bit data obtained by performing the division by the ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and the division by the expression: X + 1 obtained in the scramble processing unit 32, m is an integer of 20 or more. Assuming that n is an integer of 40 or more, assuming that there is a portion where m-bit “1” is continuous and n-bit “0” is continuous, a ninth-order primitive polynomial of the portion: X ⁹ + X ⁴ +1 The original data before division by X and division by X + 1 is A (X): m bits of “1” continuation: n bits of A (X) and B (X) as arbitrary data. A sequence of “0”: a sequence of B (X) multiplied by a formula: X + 1 and a ninth-order primitive polynomial: X ⁹ + X ⁴ +1.
[A (X): m bits of “1” continuation: n bits of “0” continuation: B (X)] × (X + 1) × (X ⁹ + X ⁴
+1) = [A (X): m-bit “1” continuation: n-bit “0” continuation: B (X)] × G (X), where G
(X) = (X + 1) × (X ⁹ + X ⁴ +1)).

In the data expressed as [A (X): m-bit “1” continuation: n-bit “0” continuation: B (X)] × G (X), [m-bit “ 1 "
× G (X) is [continuation of m-bit “1”] ×
(X + 1) = 10 ... 01 (where 0 ... 0 is m
(Continuation of −1 bit “0”) = X ^m +1 and (X
^m + 1) × (X ⁹ + X ⁴ +1) = (X ⁹ + X ⁴ +1) ×
X ^m + (X ⁹ + X ⁴ +1), so [A
(X): m bits of “1” continuation: n bits of “0” continuation: B (X)] × G (X) is UUUUUUUUU
Is 10 bits where the result of A (X) × G (X) is added, and VVVVVVVVVVV is 10 bits where the result of B (X) × G (X) is added.
00010 ******** 01000000100010 ///
// 0 (where 0 **** is a continuation of m-10-bit "0" and 0 //// 0 is a continuation of n-bit "0"). UUUUUUU is assigned to the upper 10 bits.
UUU is added and the lower 10 bits are VVVVVV
VVVV is added.

Thus, a ninth-order primitive polynomial: X ⁹ + X
^{In the} bit data obtained by performing the division by ⁴ + 1 and the division by the formula: X + 1, if there is a portion where m-bit "1" is continuous and n-bit "0" is continuous, the portion of the bit is obtained. 9th-order primitive polynomial: X ⁹ + X
^In the original data before the division by ⁴ + 1 and the division by the formula: X + 1, the first "0" sequence is m-10 bits, and the last "0" sequence is n bits. Will be. However, such first "0"
Is a sequence of m-10 bits, and the sequence of the last "0" is n.
The data to be bits is a 5-channel SDTI signal D
Under the condition that the line synchronization period portion and the field synchronization period portion are aligned with TIP1 to DTIP5,
20-bit word string data D obtained by performing a multiplexing process of sequentially taking out 10 bits from each and multiplexing them.
It does not appear in those obtained by converting TP (20) into serial data.

Therefore, in the scramble processing unit 32, the division by the ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and the division by the expression: X + 1 include six consecutive 10-bit word data. 3FF
h, 3FFh, 000h, 000h, 000h and 00
No portion corresponding to the data obtained by converting 0h to serial data does not appear. As a result, the scrambled 20-bit word string data DTSC (20)
Is three consecutive 20-bit word data 3FF: 3FFh, 000: 0, which are 20-bit word synchronous data.
00h and 000000h will not be included.

Even in the data transmission apparatus shown in FIG. 5 as described above, the P / S conversion section 36 and the transmission signal forming section 3
7 converts the composite 20-bit word string data having a word transmission rate of 74.25 MBps to a bit transmission rate of 7
Since the data is converted into serial data of 4.25 MBps × 20 = 1.485 Gbps and transmitted, such a P / S conversion unit 36 and a transmission signal formation unit 37 are provided, for example, in a digital format under an HDTV system. An integrated circuit (IC) element provided for transmitting a video signal can be effectively used. Therefore, the development of new circuit elements and the like is based on the assumption that the multiplex transmission of the five-channel SDTI signals DTIP1 to DTIP5 can reliably obtain the data synchronization state required for the reproduction process on the receiving side by the 20-bit word synchronization data. This can be done with a means that can be relatively easily prepared without requiring.

In the data transmission apparatus shown in FIG. 5, a 5-channel SDTI is used as parallel data, each of which is a 10-bit quantized digital signal.
The signals DTIP1 to DTIP5 are supplied to the 20-bit word string data forming unit 31.
Instead of the DTI signals DTIP1 to DTIP5, for example, as in the data transmission method according to the invention described in claim 10 of the present application, for example, the SDTI signal DTI
The SDTI signals as serial data of a plurality of channels obtained by serially transmitting the SDTI signals of a plurality of channels, each of which is a 10-bit quantized digital signal such as P1 to DTIP5, are bit synchronized with each other. May be supplied to the 20-bit word string data forming unit corresponding to the 20-bit word string data forming unit 31 after the calculation. In that case, SDTI of a plurality of channels each of which is serial data
20-bit word string data based on the signal is formed and provided for transmission.

FIG. 7 shows a composite 20-bit signal transmitted from the transmission signal forming unit 17 in the example of the data transmission apparatus shown in FIG. 1 according to the example of the data transmission method according to the invention described in the claims of the present application. Word string data DVZ (2
0) shows an example of a data receiving apparatus that receives a transmission signal SV based on serial data DVS obtained by converting (0).

In the example of the data receiving apparatus shown in FIG. 7, for example, an electric signal suitable for a data transmission path formed by using a coaxial cable, or an optical signal formed by using an optical fiber is used. And a receiving unit 51 that receives a transmission signal SV that is an optical signal suitable for the data transmission path. When receiving the transmission signal SV, the receiver 51 reproduces the serial data DVS based on the received transmission signal SV, and reproduces the reproduced serial data DVS.
VS detects synchronous data, serial / parallel (S / P)
It is supplied to the conversion unit 52.

In the synchronous data detection / S / P converter 52, three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 000: which are 20-bit word synchronous data in the serial data DVS.
000h is detected as synchronous data, and a part of the serial data DVS is subjected to S / P conversion by performing word synchronization based on the detected synchronous data. 9A, a composite 20-bit word string data DVZ (20) based on the serial data DVS, for example, parallel data having a word transmission rate of 74.25 MBps.
To play. Then, the synchronous data detection / S / P converter 5
2 compound word string data DVZ obtained from
(20) is supplied to the word data separation / speed conversion unit 53.

The synchronous data detection / S / P converter 52
, The composite 20-bit word string data DVZ (2
0) in the additional word data group DWT.
Three consecutive 20-bit word data 3FF: 3FFh, 000000h which are 0-bit word synchronous data
And 000: 000h, and sends out a synchronous data detection output signal SWS. This synchronous data detection output signal S
WS is, for example, the composite 20-bit word string data DV detected by the synchronous data detection / S / P converter 52.
Three consecutive 20-bit word data 3FF: 3F in the additional word data group DWT in Z (20)
It is obtained as shown in FIG. 8B or FIG. 9B, corresponding to the last of Fh000: 000h and 000000: h. Note that arrows in FIGS. 8 and 9 also indicate the passage of time.

In this way, synchronous data detection / S / P
Synchronous data detection output signal SWS obtained from converter 52
Is supplied to the control signal forming unit 54. Then, in the control signal forming section 54, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The word data separation / speed conversion unit 53 to which the composite 20-bit word string data DVZ (20) is supplied from the synchronization data detection / S / P conversion unit 52 receives the synchronization control signal from the control signal forming unit 54. CW is also provided. Then, in the word data separation / speed conversion section 53, the word transmission rate is set to 74.25 Mbps from the composite 20-bit word string data DVZ (20) under the control of the word synchronization by the synchronization control signal CW. The bit word string data DVSC (20) and the additional word data group DWT are separated and taken out, and the taken out 20 bit word string data DVSC
(20) is subjected to speed conversion from a word transmission speed of 74.25 MBps to a word transmission speed of 67.5 MBps.

The word transmission rate obtained from the word data separation / speed conversion section 53 is set to 67.5 MBps.
The bit word string data DVSC (20) is supplied to the descramble processing unit 55. Descramble processing unit 5
5, the 20-bit word string data DVSC (2
0), a descrambling process is performed to restore the original data after the scrambling process applied to the data is released, and as a result, 20-bit word string data DVP (20) having a word transmission speed of 67.5 MBps is obtained. Can be

[0086] The 2 obtained from the descrambling processing unit 55
The 0-bit word string data DVP (20) is supplied to the data separation unit 56. In the data separating section 56, 20 bit data in each 20-bit word data constituting the 20-bit word string data DVP (20) from the descrambling processing section 55 are sequentially divided into 5 groups of 10 by 10 pieces. At the same time, the state where each of the bit data of each group is individually taken out continues,
Based on 20-bit word string data DVSC (20),
5-channel digital video signals DV each having parallel data with a word transmission rate of 27 MBps
P1, DVP2, DVP3, DVP4 and DVP5 are:
It is formed as being separated from each other. Thereby,
From the data separation unit 56, the reproduced 5-channel digital video signals DVP1 to DVP5 are derived. In this way, each of the five-channel digital video signals DVP1 to DVP5 converted into parallel data with a word transmission rate of 27 MBps is reproduced.

FIG. 10 shows a composite 20 bit transmitted from the transmission signal forming unit 37 in the example of the data transmission apparatus shown in FIG. 5 according to the example of the data transmission method according to the invention described in the claims of the present application. Word string data DTZ
(20) shows an example of a data receiving apparatus that receives a transmission signal ST based on serial data DTS obtained by conversion.

In the example of the data receiving apparatus shown in FIG. 10, for example, an electric signal suitable for a data transmission path formed by using a coaxial cable or an optical fiber formed by using an optical fiber is used. A receiving unit 61 is provided for receiving a transmission signal ST, which is an optical signal suitable for the data transmission path. The receiving unit 61 transmits the transmission signal ST
Is received, the serial data DTS based on the received transmission signal ST is reproduced, and the reproduced serial data DTS is supplied to the synchronous data detection / S / P converter 62.

In the synchronous data detecting / S / P converter 62, three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 000: 20-bit word synchronous data in the serial data DTS.
000h is detected as synchronization data, the word data is synchronized based on the detected synchronization data, and S / P conversion is performed on the serial data DTS. 9A, a composite 20-bit word string data DTZ (20) based on the serial data DTS, for example, parallel data with a word transmission rate of 74.25 MBps
To play. Then, the synchronous data detection / S / P converter 6
20 complex word string data DTZ obtained from
(20) is supplied to the word data separation / speed conversion unit 63.

The synchronous data detection / S / P converter 62
, The composite 20-bit word string data DTZ (2
0) in the additional word data group DWT.
Three consecutive 20-bit word data 3FF: 3FFh, 000000h which are 0-bit word synchronous data
And 000: 000h, and sends out a synchronous data detection output signal SWS. This synchronous data detection output signal S
WS is the composite 20-bit word string data DT detected by the synchronous data detection / S / P converter 62, for example.
Three consecutive 20-bit word data 3FF: 3F in the additional word data group DWT in Z (20)
It is obtained as shown in FIG. 8B or FIG. 9B, corresponding to the last of Fh000: 000h and 000000: h.

In this way, synchronous data detection / S / P
Synchronous data detection output signal SWS obtained from conversion section 62
Is supplied to the control signal forming unit 64. Then, in the control signal forming section 64, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The word data separation / speed conversion unit 63 to which the composite 20-bit word string data DTZ (20) is supplied from the synchronization data detection / S / P conversion unit 62 is supplied with the synchronization control signal from the control signal forming unit 64. CW is also provided. Then, in the word data separation / speed conversion section 63, the word transmission rate is set to 74.25 Mbps from the composite 20-bit word string data DTZ (20) under the control of the word synchronization by the synchronization control signal CW. The bit word string data DTSC (20) and the additional word data group DWT are separated and extracted, and the extracted 20 bit word string data DTSC
(20) is subjected to speed conversion from a word transmission speed of 74.25 MBps to a word transmission speed of 67.5 MBps.

The word transmission speed obtained from the word data separation / speed conversion unit 63 is 67.5 MBps.
The bit word string data DTSC (20) is supplied to the descrambling processing unit 65. Descramble processing unit 6
5, the 20-bit word string data DTSC (2
0) is subjected to a descrambling process for restoring the scramble process applied to the original data, and as a result, 20-bit word string data DTP (20) having a word transmission speed of 67.5 MBps is obtained. Can be

[0094] The 2 obtained from the descrambling unit 65
The 0-bit word string data DTP (20) is supplied to the data separation unit 66. In the data separation section 66, 20 bit data in each 20-bit word data constituting the 20-bit word string data DTP (20) from the descrambling processing section 65 are sequentially divided into 5 groups of 10 by 10 pieces. At the same time, the state where each of the bit data of each group is individually taken out continues,
Based on 20-bit word string data DTSC (20),
SDTI signals DTIP of five channels each of which is parallel data with a word transmission rate of 27 MBps
1, DTIP2, DTIP3, DTIP4 and DTIP
5 are formed as being separated from each other. Thereby, the reproduced 5-channel SDTI signals DTIP1 to DTIP5 are derived from the data separation unit 66.
In this way, each has a word transmission rate of 27 MBp
SDT of 5 channels converted to parallel data as s
Each of the I signals DTIP1 to DTIP5 is reproduced.

In an example of a data transmission method implemented using the example of the data transmission apparatus shown in FIG. 1 or FIG. 5, for example, a digital video signal of five channels or an SDTI signal is multiplexed and transmitted. However, the number of digital video signals or SDTI signals to be multiplexed and transmitted is not limited to five channels, but may be any number of channels.

Further, in the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 1 or FIG. 5, the digital video signals or SDTI signals of five channels to be multiplexed and transmitted are respectively transmitted. Although the word transmission rate is set to, for example, 27 MBps, the word transmission rate of each of the multiplex-transmitted digital video signals or SDTI signals of a plurality of channels is not limited to 27 MBps.

[0097]

As is apparent from the above description, in the data transmission method according to any one of the first to twelfth aspects of the present invention, conversion into serial data is performed. Composite 20 based on a plurality of digital image information signals transmitted to be transmitted
The bit word string data includes the 20-bit word synchronization data to which a predetermined code is given, and together with the 20-bit word synchronization data, the 20-bit word string included in the composite 20-bit word string data Since the data is assumed to have been subjected to scramble processing, the receiving side receiving the serial data based on the composite 20-bit word string data including the 20-bit word synchronization data, based on the received serial data, The data is properly detected as word synchronization data required for processing for reproducing a plurality of digital image information signals from the obtained composite 20-bit word string data. Therefore, on the receiving side, a state is ensured in which the data synchronization state required for the reproduction processing of a plurality of digital image information signals based on the received composite 20-bit word string data is reliably obtained. You.

The plurality of digital image information signals are respectively composed of a Y data sequence and a P data sequence as in the data transmission method according to the third or eighth aspect of the present invention. _B / P _R data series or a as a digital video signal in the form of a word multiple data sequence, a plurality of the digital video signal which is to be accorded the predetermined signal format,
Alternatively, each is a plurality of digital signals formed according to a specific signal format used for transmitting compressed digital video data or video and audio data, such as SDTI signals.

In the data transmission method according to any one of the first to twelfth aspects of the present invention, a predetermined code is provided. Conversion of 20-bit word string data to which bit-word synchronization data has been added into serial data, transmission of the converted serial data, reception of serial data on the receiving side, and 20-bit word string of received serial data Conversion to data, etc.
For example, the transmission can be performed using a transmission circuit device used for transmitting and receiving a digital video signal under an HDTV system. Therefore, according to the data transmission method according to the invention described in claim 1 in the scope of the appended claims to claim 12, Y data sequence and P _B / P _R data sequence or word multiplexed data sequence Digital video signal in the form of
For digital image information signals such as DTI signals,
By means that can be arranged relatively easily, a plurality of these can be multiplexed and transmitted so as to be surely reproduced on the receiving side.

In the data transmission apparatus according to the thirteenth aspect of the present invention, a plurality of digital data transmitted by the data transmission means to be converted into serial data and transmitted. The composite 20-bit word string data based on the video signal includes 20-bit word synchronization data to which a predetermined code is given, and a composite 20-bit word string together with an additional word data group including the 20-bit word synchronization data. Since the 20-bit word string data included in the word string data is assumed to have been subjected to scramble processing by the scramble processing means, the 20-bit word synchronization data is converted to serial data based on the composite 20-bit word string data including the same. The receiving side receives the serial data As the word synchronization data required for processing for reproducing a plurality of digital video signals from the composite 20-bit word sequence data obtained by Zui, it will be properly detected. Therefore, on the receiving side, a state is ensured in which the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the received composite 20-bit word string data is reliably obtained. .

According to the data transmission apparatus according to the thirteenth aspect of the present invention, a 20-bit word synchronous data to which a predetermined code is given is added. Conversion of bit word string data to serial data, transmission of converted serial data, and reception of serial data on the receiving side, conversion of received serial data to 20-bit word string data, and the like, for example, can be performed over a transmission circuit devices used in the transmission and reception of digital video signals in the original HDTV system, therefore, as a digital video signal in the form of a Y data sequence and P _B / P _R data sequence Of digital video signals of So that can transmit raw movable to and multiplexed.

Further, in the data transmission apparatus according to the invention described in claim 14 of the present application, the data transmission means converts the data into serial data and transmits the serial data. SD
The composite 20-bit word string data based on a plurality of digital signals, which is a TI signal, includes 20-bit word synchronization data provided with a predetermined code, and includes the 20-bit word synchronization data. The 20-bit word string data included in the composite 20-bit word string data together with the additional word data group is assumed to have been subjected to scramble processing by the scramble processing means. On the receiving side receiving the serial data based on the bit word string data, as word synchronization data required for processing for reproducing a plurality of SDTI signals from composite 20-bit word string data obtained based on the received serial data, , Will be properly detected. Therefore, on the receiving side, a plurality of SDTs based on the received composite 20-bit word string data
A state is ensured in which the data synchronization state required for the reproduction processing of a plurality of digital signals such as the I signal can be reliably obtained.

According to such a data transmission apparatus according to the invention as set forth in claim 14 of the present application, a composite in which 20-bit word synchronous data to which a predetermined code is given is added. The conversion of the 20-bit word string data into serial data, the transmission of the converted serial data, and the reception side receiving the serial data, converting the received serial data into composite 20-bit word string data, For example, it can be performed by using a transmission circuit device used for transmitting and receiving a digital video signal under an HDTV system, and therefore, is capable of transmitting compressed digital video data or video and audio data such as an SDTI signal. A digital signal that conforms to the specific signal format used for transmission For it, with means which can adjust relatively easily, the plurality securely so that it can be transmitted by being multiplexed to be reproduced on the receiving side.

[Brief description of the drawings]

FIG. 1 Claims 1 to 1 in the claims of the present application
A block showing an example of a data transmission apparatus according to the invention described in claim 13 in the claims of the present application, in which the example of the data transmission method according to the invention described in any one of 4, 6, and 7 is implemented. It is a block diagram.

FIG. 2 is a block diagram showing a specific configuration example of a rate conversion / data insertion unit in the example of the data transmission device shown in FIG. 1;

[Fig. 3] Claims 1 to 1 in the claims of the present application.
3 is a time chart for explaining an example of a data transmission method according to the invention described in any one of 2.

[Fig. 4] Claims 1 to 12 in the claims of the present application.
5 is a time chart for explaining an example of the data transmission method according to the invention described in any one of the above.

FIG. 5 is a diagram illustrating an example of a data transmission method according to an embodiment of the present invention; FIG. 16 is a block diagram showing an example of a data transmission device according to the invention described in claim 14 in the range of FIG.

6 is a block diagram showing a specific configuration example of a rate conversion / data insertion unit in the example of the data transmission device shown in FIG. 5;

FIG. 7 is a block diagram illustrating an example of a data receiving device that receives a transmission signal transmitted from a transmission signal forming unit in the example of the data transmission device illustrated in FIG. 1;

FIG. 8 is a time chart for explaining the operation of the example of the data receiving apparatus shown in FIGS. 7 and 10;

FIG. 9 is a time chart used for explaining the operation of the example of the data receiving device shown in FIGS. 7 and 10;

10 is a block diagram illustrating an example of a data receiving device that receives a transmission signal transmitted from a transmission signal forming unit in the example of the data transmission device illustrated in FIG. 5;

FIG. 11 is a conceptual diagram provided for describing an example of a data format of a digital video signal.

FIG. 12 is a conceptual diagram illustrating an example of a data format of a digital video signal.

FIG. 13 is a conceptual diagram illustrating an example of a data format of an SDTI signal.

[Explanation of symbols]

11, 31... 20-bit word string data forming unit,
12, 32 ... scramble processing unit, 13, 33
..Composite data forming unit, 14, 34 ... speed conversion
Data insertion unit, 15, 35 ... word data transmission unit, 16, 36 ... P / S conversion unit, 17, 37
..Transmission signal forming units, 20, 25, 40, 45,.
Switch, 21, 41: Switch control signal forming unit, 22, 23, 42, 43: Memory unit, 2
4, 44... Memory control signal forming section, 51, 61.
・ Receiver, 52,62 ・ ・ ・ Synchronous data detection ・ S / P
Conversion units, 53, 63: Word data separation / speed conversion unit, 54, 64: Control signal formation unit, 55, 6
5 ... descrambling processing unit, 56, 66 ... data separation unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C059 RB09 RB10 RB19 RC02 RE01 SS21 UA24 5C063 AA06 AB03 AB07 AC01 AC05 AC10 CA34 5K028 AA14 EE03 KK01 KK16 MM16 NN23 NN47 RR03 SS05 SS06 SS07

Claims (14)

[Claims] A multiplexing process is performed on a plurality of digital image information signals to form 20-bit word string data.
After performing a scrambling process on the bit word string data and performing a transmission rate conversion process, an additional word data group including 20-bit word synchronization data to which a predetermined code is given at predetermined word intervals. To form composite 20-bit word string data, convert the composite 20-bit word string data into serial data, and transmit the serial data for transmission. 2. An additional word data group is selected so as to include, as a 20-bit word synchronization data, a portion in which a plurality of 20-bit word data to which a predetermined code is assigned is connected in a specific arrangement. The data transmission method according to claim 1, wherein: 3. The data transmission method according to claim 1, wherein a plurality of digital image information signals are selected as a plurality of digital video signals each of which follows a predetermined signal format. 4. Each of a plurality of digital video signals is
4. The data transmission method according to claim 3, wherein the parallel data is a bit-quantized digital signal and is in a word synchronous relationship with each other. 5. Each of a plurality of digital video signals is
4. The data transmission method according to claim 3, wherein the bit-quantized digital signals are obtained by serial transmission and have a bit synchronization relationship with each other. 6. When multiplexing a plurality of digital image information signals to form 20-bit word string data, a predetermined number of bits of bit data are sequentially extracted from each of the plurality of digital video signals. 6. The data transmission method according to claim 4, wherein a multiplexing process is performed on the data. 7. An additional word data group is defined by a plurality of 20-bit word data to which a predetermined code is assigned based on timing reference data included in each of a plurality of digital video signals, in a specific arrangement. 7. The data transmission method according to claim 3, wherein the continuous part is selected to include the 20-bit word synchronization data. 8. A method according to claim 1, wherein a plurality of digital image information signals are selected as a plurality of digital signals each formed according to a specific signal format used for transmitting compressed digital video data or video and audio data. The data transmission method according to claim 1 or 2, wherein: 9. The method according to claim 7, wherein each of the plurality of digital signals is parallel data converted into a 10-bit quantized digital signal and has a word synchronous relationship with each other. Data transmission method. 10. The digital signal according to claim 7, wherein each of the plurality of digital signals is obtained by serially transmitting a 10-bit quantized digital signal and has a bit synchronous relationship with each other. Data transmission method. 11. When multiplexing a plurality of digital signals to form 20-bit word string data, a predetermined number of bits of bit data are sequentially extracted from each of the plurality of digital signals. 11. The data transmission method according to claim 9, wherein a multiplexing process is performed. 12. A plurality of 20-bit word data to which an additional word data group is assigned a predetermined code on the basis of timing reference data included in each of a plurality of digital signals. The data transmission method according to any one of claims 8 to 11, wherein the portion is selected to include the 20-bit word synchronization data. 13. A 20-bit word string data forming means for multiplexing a plurality of digital video signals to form 20-bit word string data, and a 20-bit word string data obtained from the 20-bit word string data forming means.
A scramble processing means for performing scramble processing on the bit word string data, and a transmission rate conversion processing on the scrambled 20-bit word string data obtained from the scramble processing means, and at predetermined word intervals, Composite data forming means for forming composite 20-bit word string data by inserting an additional word data group including 20-bit word synchronization data to which a predetermined code is given, and a composite obtained from the composite data forming means A data transmission unit for converting 20-bit word string data into serial data and transmitting the serial data for transmission. 14. A multiplexing process for a plurality of digital signals, each of which conforms to a specific signal format used for transmitting compressed digital video data or video and audio data, to form a 20-bit word string. 20-bit word string data forming means for forming data; and 20 bits obtained from the 20-bit word string data forming means.
A scramble processing means for performing scramble processing on the bit word string data, and a transmission rate conversion processing on the scrambled 20-bit word string data obtained from the scramble processing means, and at predetermined word intervals, Composite data forming means for forming composite 20-bit word string data by inserting an additional word data group including 20-bit word synchronization data to which a predetermined code is given, and a composite obtained from the composite data forming means A data transmission unit for converting 20-bit word string data into serial data and transmitting the serial data for transmission.