JP4816709B2 - Information transmitting apparatus, information transmitting method, information receiving apparatus, and information receiving method - Google Patents

Description

The present invention relates to an information transmitting apparatus, information transmitting method, the information receiving apparatus, relates to the information receiving method, in particular, more efficiently, and to be able to transmit audio data by multiplexing the video data, the information transmission device , information transmission method, the information receiving apparatus, relates to the information receiving method.

  When transferring other data superimposed on video data, a blanking period of the video data is often used.

  For example, insertion of text data during a vertical blanking period is performed in character broadcasting.

  However, since the blanking period is extremely short compared to the period during which original video data is transmitted, the type of data that can be multiplexed is limited to data having a small capacity such as text data.

  The present invention has been made in view of such a situation. For example, the capacity is small compared to video data such as audio data, but a larger capacity data is efficiently compared to text data. It can be transmitted.

An information transmitting apparatus according to an aspect of the present invention includes a first capturing unit that captures video data, a second capturing unit that captures audio data, and a setting period shorter than the blanking period during the blanking period of the video data. Setting means for setting the audio data, a multiplexing means for multiplexing the audio data in a superposition period corresponding to a difference between the blanking period of the video data and the setting period set by the setting means, and the multiplexing Video data transmitting means for encoding the video data multiplexed with the audio data by the converting means into data having a larger number of bits than the video data and transmitting the data to a data channel; and holding means for storing data representing the superposition period And during the superposition period represented by the data stored in the holding means And a timing control means for controlling the timing of multiplexing of the audio data so as to overlap the Odeta, the setting period, the audio data is not used in a multiplexed encoded video data, a predetermined shown with the specific data, the specific data represents the identification information for identifying the overlap period corresponding to the video data.

  The blanking period may be a horizontal blanking period and a vertical blanking period.

Generates a clock from the input pixel clock, the generated clock can be made to comprise a PLL circuit for supplying to said timing control means.

The accumulated audio data may further include a buffer for output to the multiplexing means.

Said retaining means, said retaining a correspondence relationship between the type and the identification information of the video data, the said multiplexing means, based on the correspondence relation stored in said holding means, said overlap period, wherein Audio data can be multiplexed.

  The identification information transmitting means can transmit the identification information during a vertical blanking period.

  The identification information may be information that can specify a period from the start point to the end point of the set period or a period from the start point to the end point of the superposition period.
  The audio data may be further provided with an encryption unit that encrypts the audio data in a common method with the video data.
  The multiplexing means multiplexes the synchronization signal, the control signal, or the identification information during the set period, and the video data transmission means receives the video data with the synchronization signal multiplexed during the set period. Video in which transmission is performed using a first data channel, video data in which the control signal is multiplexed in the setting period is transmitted in a second data channel, and the identification information is multiplexed in the setting period Data can be transmitted using the third data channel.

An information transmission method according to one aspect of the present invention is the information transmission method of the information transmission apparatus having the holding unit that stores the data representing the superposition period, the first capturing step of capturing video data, and the second of capturing audio data. A capturing step; a setting step for setting a setting period shorter than the blanking period during the blanking period for the video data; a blanking period for the video data; and the setting period set by the processing of the setting step; the overlap period corresponding to the difference, a multiplexing step of multiplexing the audio data, the video data to which the audio data are multiplexed by the processing of said multiplexed step often, of the number of bits from the video data data To the video data transmission step Includes a flop, and a timing control step of controlling the timing of multiplexing of the audio data so as to superimpose the audio data in the overlap period represented by the data stored in said holding means, the setting period , the audio data is not used in the video data encoded are multiplexed, are shown in a particular predetermined data, the specific data represents the identification information for identifying the overlap period corresponding to the video data .

In the information receiving apparatus according to another aspect of the present invention, a setting period shorter than the blanking period is set during a blanking period of video data, and an overlap corresponding to a difference between the blanking period of the video data and the setting period is set. An information receiving apparatus for receiving transmission data in which audio data is multiplexed in a period, and video data in which the audio data is multiplexed is encoded into data having a larger number of bits than the video data and transmitted to a data channel. The set period set in the transmission data is indicated by predetermined specific data that is not used in the video data in which the audio data is multiplexed and encoded, and the specific data corresponds to the video data. It represents an identification information for identifying the overlap period, from the transmission data, bidet And capture means for capturing the data, specifying means for specifying the superimposition period of the video data captured in response to the type of the video data by the capture means, from the video data captured by the capture means, said Separating means for separating the audio data multiplexed in the superposition period specified by the specifying means, and holding means for storing data representing the superposition period .

  Conversion means for converting the audio data separated by the separation means into continuous data can be further provided.

And detects the setting period of the video data captured by said capturing means, generating means for generating the identification information based on the value of said specific data indicative of the detected said set period may further include. In this case, the holding unit holds a correspondence between the type of the video data and the identification information, and the generation unit has the identification information based on the correspondence held in the holding unit. Can be generated.

The generating means can generate the identification information from a blanking signal in a vertical blanking period.

  The identification information may be information that can specify a period from the start point to the end point of the superposition period or a period from the start point to the end point of the set period.

  An expansion means for expanding the audio data can be further provided.

  Decoding means for decrypting the audio data encrypted by a method common to the video data by a method common to the video data can be further provided.

According to another aspect of the present invention, there is provided an information receiving method in which a setting period shorter than the blanking period is set during a blanking period of video data, and a superposition corresponding to a difference between the blanking period of the video data and the setting period. period audio data is multiplexed in the audio data is multiplexed video data, receives the transmission data to which the encoded from the video data in more data of bits sent to the data channel, the overlap period An information receiving method of an information receiving apparatus having a holding means for storing data to be represented , wherein the set period set in the transmission data is determined in advance not to be used in video data in which the audio data is multiplexed and encoded. indicated by the specific data, the specific data, before corresponding to the video data Represents an identification information for identifying the overlap period, from the transmission data, and capture steps of capturing video data, the overlap period of the video data captured by the process of the incorporation step corresponding to the type of the video data A separating step for separating the audio data multiplexed in the superposition period identified by the processing of the identifying step from the video data captured by the processing of the capturing step ; And a timing control step for controlling the timing of separation of the audio data so as to separate the audio data multiplexed in the superposition period represented by the data stored in the holding means .

In one aspect of the present invention, video data is captured, audio data is captured, and a set period shorter than the blanking period is set during the blanking period of the video data. Also, the audio data is multiplexed in a superposition period corresponding to the difference between the blanking period of the video data and the set setting period, and the video data multiplexed with the audio data has a bit number greater than that of the video data. It is encoded into a lot of data and sent to the data channel.

  In another aspect of the present invention, video data is captured from transmission data, a multiplexing period of the captured video data is specified corresponding to the type of video data, and multiplexing specified from the captured video data Audio data multiplexed in a period is separated.

  According to one aspect of the present invention, an audio signal can be transmitted efficiently.

  According to another aspect of the present invention, a compressed audio signal can be reliably extracted, and the length of the original blanking period can be easily and reliably recovered to reproduce a video signal. Can be prevented from being adversely affected.

  FIG. 1 shows a configuration example of a transmission / reception system to which the present invention is applied. The digital tuner 31 receives broadcast radio waves via an antenna 32, and outputs a demodulated output thereof by a TMDS (Transition Minimized Differential Signaling) code 34 (hereinafter simply referred to as TMDS 34) based on the DVI (Digital Video Interface) standard. This is supplied to the monitor 33. The digital tuner 31 is also connected to the monitor 33 by a DDC (Display Data Channel) bus (hereinafter simply referred to as DDC 35) based on the DVI standard.

  The digital tuner 31 has a front end 41. The front end 41 demodulates a broadcast wave received via the antenna 32 and demodulates video data and audio data (hereinafter also referred to as AV data). ) Is output to the AV decoder 42. The AV decoder 42 decodes the AV data supplied from the front end 41 and outputs it to the transmitter 43. The transmitter 43 is controlled by the control unit 44 and outputs the AV signal supplied from the AV decoder 42 to the monitor 33 via the TMDS 34.

  The monitor 33 incorporates a receiver 51. The receiver 51 receives AV data supplied from the transmitter 43 of the digital tuner 31 via the TMDS 34, and separates audio data, video data, and synchronization data.

  The audio data output from the receiver 51 is D / A converted by the D / A converter 52 and output from the left and right channel speakers 53 and 54.

  The video data output from the receiver 51 is D / A converted by the D / A converter 55, amplified by the RGB amplifier 56, and output to the CRT 58.

  The H / V sync generation unit 57 generates a horizontal synchronization signal and a vertical synchronization signal based on the synchronization data supplied from the receiver 51 and supplies it to the drive circuit of the CRT 58.

  FIG. 2 shows a configuration example of the transmitter 43. The pixel data A, pixel data B, and pixel data C for three channels A, B, and C constituting the video data output from the AV decoder 42 (as shown in FIGS. 3A, B, and C, respectively) For example, blue (B), green (G), or red (R) pixel data) is supplied from the terminals 80A, 80B, and 80C to the input terminals on the upper side of the switches 81A, 81B, and 81C, respectively. Is done. The pixel data of each color (channel) is represented as 8-bit data for each pixel.

  The terminal 91 is supplied with 2-bit data constituting horizontal synchronization data and vertical synchronization data. This 2-bit data is supplied to the encoder 83A.

  For example, as shown in FIG. 3E, 2-bit data constituting control signals (CTL0, CTL1) is input to the terminal 92. The 2-bit data is supplied to the encoder 83B.

  In this example, audio data is input to the terminal 93 as superimposed (multiplexed) data. The audio data input from the terminal 93 is temporarily stored by the buffer 84 and then supplied to the lower input terminal of the switch 81A, 81B or 81C as data in units of 8 bits.

  As shown in FIG. 3D, a blanking signal representing a blanking period is input to the terminal 94, and this blanking signal is supplied to the timing generation unit 85.

  As illustrated in FIG. 3F, a pixel clock of 25 MHz to 165 MHz is input to the terminal 95, and this pixel clock is supplied to the PLL circuit 87. This pixel clock is a clock synchronized with each pixel of channels A, B, and C. The PLL circuit 87 generates a clock having a frequency 10 times that is synchronized with the input pixel clock, supplies the generated clock to the timing generation unit 85, and outputs a stable pixel clock to the monitor 33.

  The timing generation unit 85 generates a timing signal in synchronization with the blanking signal and the pixel clock, and generates a timing signal for controlling the buffer 84, the switches 81A, 81B, and 81C, and the encryption units 82A, 82B, and 82C. The timing generator 85 also sets (shortens) the blanking signal to a predetermined length, and supplies the set blanking signal to the encoders 83A, 83B, 83C.

  The switches 81A, 81B, 81C are switched to the upper input terminal or the lower input terminal in the drawing based on the timing signal supplied from the timing generation unit 85, respectively, and the pixel data A to C or audio data And the selected pixel data or audio data is output to the corresponding encryption units 82A, 82B, and 82C, respectively.

  The encryption units 82A, 82B, and 82C encrypt the input video data (pixel data) or audio data using a common algorithm, and output the encrypted data to the corresponding encoders 83A, 83B, and 83C.

  The superimposition period table 86 stores in advance data relating to the length of the horizontal blanking period and the length of the vertical blanking period corresponding to the pixel data output from the encoders 83A to 83C.

  For example, when the pixel data to be encoded and output is 480p (the number indicates the number of scanning lines, and p indicates the progressive method), the horizontal blanking period is 138 pixels long, and is 720p The length of the horizontal blanking period is 370 pixels. In the case of 1080i (i indicates that the interlace method is used), the length of the horizontal blanking period is 280 pixels.

  The timing generation unit 85 switches the switches 81A and 81C to the lower side in the figure for the superimposition period (multiplexing period) stored in the superimposition period table 86 to select audio data.

  The encoder 83A receives the 8-bit pixel data A or audio data supplied from the encryption unit 82A during a period in which the blanking signal set by the timing generation unit 85 (hereinafter referred to as a set blanking signal) is not supplied. Are encoded based on a predetermined algorithm and output as 10-bit data of the data channel A.

  Further, the encoder 83A is based on the 2-bit horizontal synchronization signal or the vertical synchronization signal input from the terminal 91 during a period during which the set blanking signal is input (hereinafter referred to as a set blanking period). 10-bit blanking data is encoded (generated) and output as data channel A data.

  Similarly to the encoder 83A, the encoders 83B and 83C encode pixel data or audio data input from the encryption unit 82B or 82C, respectively, and output the data as 10-bit data when it is not the set blanking period. In the set blanking period, the encoder 83B encodes (generates) 10-bit blanking data based on the 2-bit control signal input from the terminal 92, and the encoder 83C supplies the superimposition period table 86. The 10-bit blanking data is encoded (generated) based on the data representing the 2-bit superposition period. The output of the encoder 83B is transmitted to the monitor 33 as the output of the data channel B, and the output of the encoder 83C is transmitted to the monitor 33 as the output of the data channel C.

  Further, the pixel clock generated by the PLL circuit 87 is transmitted to the monitor 33 as clock channel data.

  FIG. 4 shows the configuration of the receiver 51. The decoders 101A to 101C receive 10-bit data of data channels A to C, respectively, decode them, and output them as 8-bit data. The decoders 101A to 101C are supplied with a clock having a frequency 10 times that is synchronized with the pixel clock input to the clock channel generated by the PLL circuit 106.

  The 8-bit pixel data A or audio data decoded by the decoder 101A is supplied to the decoding unit 102A. When 10-bit blanking data is input, the decoder 101A converts this into 2-bit horizontal synchronization data or vertical synchronization data, and supplies it to the H / V sync generation unit 57.

  The 8-bit pixel data B or audio data output from the decoder 101B is supplied to the decoding unit 102B. When 10-bit blanking data is input, the decoder 101B converts this into a 2-bit control signal and supplies it to the control unit 59 of the monitor 33.

  The 8-bit pixel data C or audio data output from the decoder 101C is supplied to the decoding unit 102C. When 10-bit blanking data is input, the decoder 101 </ b> C converts this into data representing a 2-bit superposition period and supplies the data to the timing generation unit 103.

  The decoders 101A to 101C also output a setting blanking signal (Data Enable) indicating the setting blanking period to the timing generation unit 103. The timing generation unit 103 refers to the superposition period table 105 (the same table as the superposition period table 86 in FIG. 2 is held), extends the set blanking period, and generates a blanking signal having the original length. Is output to the H / V sink generation unit 57. Further, the timing signal generator 103 has a PLL circuit 106 that generates in synchronization with the data of the clock channel and has a stabilized pixel clock (a clock having the same frequency as the pixel clock input to the terminal 95 of the transmitter 43). Have been supplied. The timing generation unit 103 generates a timing signal based on the input data and supplies the timing signal to the decoding units 102A to 102C and the buffer 104.

  The decoding units 102A to 102C decode the input 8-bit pixel data A or audio data, pixel data B or audio data, pixel data C or audio data, respectively, and output the pixel data to the D / A converter 55. To do.

  The 8-bit audio data decoded by the decoding units 102A to 102C is supplied to the buffer 104, converted into continuous data, and then output to the D / A converter 52.

  The blanking signal generated by the timing generation unit 103 is generated by the PLL circuit 106 and is input to the terminal clock 95 of the transmitter 43 in FIG. 2 at a frequency of 1/10 of the clock supplied to the decoders 101A to 101C. And a clock having the same frequency as the pixel clock to be supplied to the H / V sink generation unit 57.

  Next, the operation will be described. When the front end 41 of the digital tuner 31 receives the radio wave of the channel designated by the user via the antenna 32, the front end 41 demodulates the received signal and outputs the demodulated signal to the AV decoder 42. The AV decoder 42 decodes the received reception signal and outputs the decoded audio data and video data to the transmitter 43. The transmitter 43 multiplexes the audio data during the horizontal blanking period of the input video data, and outputs it to the monitor 33 via the TMDS 34.

  Since the TMDS 34 is originally an interface for a personal computer, the audio data cannot be sent. However, in this example, since the audio data is multiplexed during the blanking period of the video data, it can be transmitted via the TMDS 34.

  On the monitor 33 side, the receiver 51 receives video data transmitted via the TMDS 34, separates audio data inserted during the blanking period, and outputs it to the D / A converter 52. The D / A converter 52 converts the input audio data into left and right channel analog audio signals and outputs them from the speakers 53 and 54.

  The horizontal synchronization data and the vertical synchronization data extracted and generated from the blanking period by the receiver 51 are supplied to the H / V sync generation unit 57. The H / V sync generation unit 57 generates a horizontal synchronization signal and a vertical synchronization signal based on the input data, and outputs them to the drive circuit of the CRT 58.

  The receiver 51 also outputs pixel data extracted from the input data to the D / A converter 55 for D / A conversion. The RGB signals (pixel data A to pixel data C) output from the D / A converter 55 are amplified by the RGB amplifier 56 and then supplied to the CRT 58 for display. At this time, the CRT 58 controls scanning of the scanning lines based on the horizontal synchronization signal and the vertical synchronization signal generated by the H / V sync generation unit 57.

  Next, referring to the flowchart of FIG. 5, the transmission process of channel A of the transmitter 43 of FIG. 2 will be described.

  In step S <b> 1, the timing generation unit 85 determines whether or not it is during the blanking period based on the input from the terminal 94. If it is not during the blanking period, the process proceeds to step S2, and the timing generation unit 85 generates a switch control signal and outputs it to the switch 81A, thereby switching the switch 81A to the upper input terminal in the figure. Thereby, pixel data A (for example, B data among RGB data) input from the terminal 80A is selected by the switch 81A and supplied to the encryption unit 82A.

  Next, in step S5, the encryption unit 82A encrypts the data selected by the switch 81A (in this case, pixel data A). In step S6, the encoder 83A encodes the pixel data A encrypted by the encryption unit 82A in step S5, and outputs the encoded data to the TMDS 34 as data channel A data in step S8.

  On the other hand, when it is determined in step S1 that the current timing is the blanking period, the process proceeds to step S3, where the timing generation unit 85 refers to the superimposition period table 86 and superimposes (multiplexes) the audio data. It is determined whether or not it is a period to be). That is, as described above, the superimposition period table 86 preliminarily defines in which period of the horizontal blanking period audio data (superimposition data) is to be superimposed. It is determined whether or not it is a period for superimposing (multiplexing) audio data.

  If it is determined that the audio data is not superimposed during the horizontal blanking period, the process proceeds to step S7, where the timing generator 85 controls the encoder 83A to input the 2-bit input from the terminal 91. Based on the horizontal or vertical synchronization data, 10-bit horizontal or vertical blanking data is generated and output.

  When 2-bit data is represented by (C1, C0), the encoder 83A outputs, for example, 10-bit control (CTL) data shown in FIG. 6 as horizontal or vertical blanking data. .

  In the example of FIG. 6, when the 2-bit input is 00 ′, the blanking data is 0010110111 ′, and when the input is 01 ′, the blanking data is 1101010100 ′ and the input is 10 ′. In some cases, the blanking data is 0010101010 ′, and when the input is 11 ′, the blanking data is 1101010101 ′. This 10-bit blanking data is predetermined as blanking data, and is unique data that is not used for either video data (pixel data) or audio data.

  The process of step S7 is originally performed over the entire blanking period, but in the present invention, it is performed only during a period in which audio data is not superimposed. This means that the blanking period is set to a length shorter than the original period.

  After step S7, the process proceeds to step S8, and the encoder 83A outputs the blanking data generated in step S7 via the TMDS 34.

  On the other hand, if it is determined in step S3 that it is a period for superimposing the audio data, the process proceeds to step S4, where the timing generation unit 85 controls the switch 81A to switch the contact to the lower side in the figure. . At this time, in step S4, the switch 81A selects the audio data supplied from the buffer 84 and outputs it to the encryption unit 82A.

  In step S5, the encryption unit 82A encrypts the audio data input via the switch 81A and outputs it to the encoder 83A. The encoder 83A encodes the encrypted audio data input from the encryption unit 82A in step S6, and outputs it to the TMDS 34 in step S8. As described above, since the video data (pixel data) and the audio data are encrypted by the common encryption unit 82A, the configuration is simplified and the apparatus is reduced in size as compared with the case where each is prepared separately. The cost can be further reduced.

  Next, channel B transmission processing will be described with reference to the flowchart of FIG.

  The processing from step S21 to step S28 in FIG. 7 is basically the same as the processing from step S1 to step S8 in the transmission processing of channel A shown in FIG. However, the pixel data selected by the switch 81B in step S22 is the pixel data B, and the data encrypted by the encryption unit 82B in step S25 is the pixel data B selected by the switch 81B or the buffer 84. This is audio data supplied by the company.

  In step S27, the encoder 83B generates 10-bit horizontal or vertical blanking data (FIG. 6) based on the 2-bit control signal supplied from the terminal 92.

  Other processes are the same as those in FIG.

  The transmission process in channel C is as shown in FIG. Steps S31 to S38 are basically the same as steps S1 to S8 in the flowchart of FIG. However, the data selected by the switch 81C in step S32 and encrypted by the encryption unit 82C in step S35 is the pixel data C supplied from the terminal 80C or the audio data supplied from the buffer 84, and step S37. The encoder 83C generates 10-bit horizontal or vertical blanking data (FIG. 6) based on 2-bit data representing the superposition period supplied from the superposition period table 86C.

  The above processing will be further described with reference to the timing chart of FIG. As shown in FIG. 9A, a blanking signal is generated at the period of the horizontal scanning line. As described above, the horizontal blanking signal period is 138 pixels in the case of 480p pixel data, 370 pixels in the case of 720p pixel data, and 280 pixels in the case of 1080i pixel data.

As shown in FIG. 9B, the first period T _{1 in the} blanking period T ₀ is a transmission blanking period, and the remaining period T ₂ in the blanking period T ₀ is audio data. Is a period in which the data is multiplexed.

The audio data is continuous data as shown in FIG. 9D, but is time-axis-compressed by being encoded by the encoders 83A to 83C, and multiplexed in the period T ₂ as shown in FIG. 9C.

FIG. 10 shows enlarged data in the vicinity of the blanking period of channel A. As shown in FIG. 10B, the period of the original blanking signal is T ₀ , but the blanking signal is multiplexed as shown in FIGS. 10A and 10C only in the period T ₁ during that period. The This means that the blanking signal is shortened from the period T ₀ to the period T ₁ . Then, audio data is multiplexed in the remaining superposition period T ₂ excluding the period T ₁ from the period T ₀ . In other words, the audio data is multiplexed as data similar to the pixel data. However, identification data representing the superposition period T ₂ is transferred in the channel C in the period T ₁ as described above so that the audio data can be identified from the pixel data on the receiving side.

  FIG. 11 shows the configuration of data in the vicinity of the blanking period in channel B. FIG. 12 shows the structure of data in the vicinity of the blanking period in channel C.

In the example of FIG. 10, horizontal synchronization data or vertical synchronization data is transmitted in the period T ₁ , whereas in the example of FIG. 11, a control signal is transmitted, and in the example of FIG. 12, table identification is performed. Data is being transmitted. That is, as described above, blanking data inserted during this period T ₁ is horizontal or vertical synchronization data (for channel A), control signal (for channel B), or table identification data (for channel C). ).

  Next, with reference to the flowchart of FIG. 13, the reception process of the channel A of the receiver 51 of FIG. 4 will be described. In step S41, the decoder 101A decodes the input data.

  In step S42, the decoder 101A determines whether or not the decoded data is blanking data. If the decoder 101A determines that the decoded data is blanking data, the process proceeds to step S43, and based on the blanking data, the horizontal Alternatively, vertical synchronization data is generated (2-bit data corresponding to the 10-bit control code in FIG. 6 is generated) and output to the H / V sync generation unit 57.

  In addition, the encoder 101A outputs data for the period corresponding to the blanking data to the timing generation unit 103 as data for the set blanking period. Details will be described in the process of step S83 in FIG. 15, but the timing generation unit 103 corrects (extends) the set blanking period to generate a blanking signal having the original length.

  If it is determined in step S42 that the decoded data is not blanking data, the data is pixel data or audio data, so the decoder 101A outputs the data to the decoding unit 102A. In step S44, the decoding unit 102A decodes the input data. Based on the timing signal from the timing generation unit 103, the decoding unit 102 determines whether or not the decoded data is audio data in step S45. If it is determined that the decoded data is audio data, the decoding unit 102 proceeds to step S46. Then, the audio data is supplied to the buffer 104 and stored therein.

Specifically, the timing generation unit 103, based on the table identification data for identifying the overlap period in which the decoder 101C outputs, reads the overlap period T ₂ corresponding to the identification data from the superimposing period table 105, the period A timing signal corresponding to T ₂ is output. Decoding unit 102A determines the data in this period T ₂ to be audio data.

  The buffer 104 is also supplied with audio data decoded by the decoding units 102B or 102C of the channel B and channel C, and the buffer 104 outputs these audio data as continuous data.

  On the other hand, when it is determined in step S45 that the decoded data is not audio data (when it is determined that the data is pixel data A), the process proceeds to step S47, and the decoding unit 102A performs D / A conversion on the data. Output to the device 55.

  FIG. 14 shows reception processing in channel B. The processes in steps S61 to S67 are basically the same as those shown in the flowchart of FIG. However, in step S63, what is generated by the decoder 101B based on the blanking data is not horizontal synchronization data or vertical synchronization data, but a control signal. This control signal is output to the control unit 59.

  The flowchart of FIG. 15 represents the reception process of the channel C of the receiver 51.

  The processing from step S81 to step S87 in FIG. 15 is also basically the same processing as the processing from step S41 to step S48 in FIG. However, the process in step S83 in FIG. 15 is different from the process in step S43 in FIG.

That is, in step S83 in FIG. 15, the decoder 101C generates 2-bit table identification data based on the 10-bit blanking data. This table identification data is data that can specify the superposition period T ₂ and is supplied to the timing generation unit 103.

The timing generation unit 103 reads the superimposition period T ₂ corresponding to the table identification data supplied from the decoder 101C from the superimposition period table 105, sets the period T ₂ in the internal memory, and in the next vertical blanking period, until a new table identification data is received, by utilizing the overlap period T _2, and generates a timing signal for separating the audio data from the pixel data.

Further, the timing generation unit 103 extends (corrects) the set blanking period T ₁ by the period T ₂ based on the set blanking data supplied from the decoders 101A to 101C and the set overlap period T _2. As a result, a blanking signal corresponding to the blanking period T ₀ of the original length is generated and output to the H / V sink generation unit 57.

The above reception process will be further described with reference to the timing chart of FIG. As shown in FIG. 16A, blanking data is inserted and transmitted only in the period T ₁ in the blanking period T ₀ . This means that the blanking period T ₀ is shortened to the set blanking period T ₁ and transmitted as shown in FIG. 16B. Otherwise, the audio data inserted in the period T ₂ will be processed as pixel data. Therefore, as illustrated in FIG. 16C, the timing generation unit 103 extends (corrects) the set blanking period T ₁ by the period T ₂ to generate a correct blanking period of the original period T _0. And output to the H / V sink generator 57.

  Further, as shown in FIG. 16D, the buffer 104 converts the divided audio data supplied from the decoding units 102A to 102C into continuous audio data, and outputs the continuous audio data to the D / A converter 52.

As shown in FIG. 12, the process of inserting the table identification data in the period T ₁ needs to be performed for each horizontal blanking period when the value of the superposition period T ₂ is changed for each horizontal scanning line. is there. However, normally, the superposition period T ₂ is not changed frequently. In such a case, the table identification data can be multiplexed only in the vertical blanking period.

In the embodiment of FIG. 1, the superimposition period table 86 or the superimposition period table 105 is held in each of the transmitter 43 of the digital tuner 31 on the transmission side and the receiver 51 of the monitor 33 on the reception side, and is held there. The table identification data indicating which table to use is inserted into the blanking period T ₁ of the channel C. The table identification data is different from the TMDS 34, for example. Transmission may be performed from the digital tuner 31 side to the monitor 33 side by the DDC 35 constituting the transmission path.

  The series of processes described above can be executed by hardware, but can also be executed by software. In this case, for example, the digital tuner 31 is configured as shown in FIG.

  In FIG. 17, a CPU (Central Processing Unit) 221 executes various processes according to a program stored in a ROM (Read Only Memory) 222 or a program loaded from a storage unit 228 to a RAM (Random Access Memory) 223. To do. The RAM 223 also appropriately stores signals necessary for the CPU 221 to execute various processes.

  The CPU 221, ROM 222, and RAM 223 are connected to each other via a bus 224. An input / output interface 225 is also connected to the bus 224.

  The input / output interface 225 includes an input unit 226 including a keyboard and a mouse, a display including a CRT and an LCD, an output unit 227 including a speaker, a storage unit 228 including a hard disk, a modem, a terminal adapter, and the like. A configured communication unit 229 is connected. The communication unit 229 performs communication processing via a network.

  A drive 230 is connected to the input / output interface 225 as necessary, and a magnetic disk 241, an optical disk 242, a magneto-optical disk 243, a semiconductor memory 244, or the like is appropriately mounted, and a computer program read from these is loaded. It is installed in the storage unit 228 as necessary.

  When the series of processing is executed by software, the receiver 51 and the like can be configured by a computer as well as the digital tuner 31 although illustration is omitted.

  When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, a general-purpose personal computer is installed from a network or a recording medium.

  As shown in FIG. 17, the recording medium is distributed to provide a program to the user separately from the apparatus main body, and a magnetic disk 241 (including a floppy disk) on which the program is recorded, an optical disk 242 (CD -ROM (Compact Disk-Read Only Memory), DVD (Digital Versatile Disk) included), magneto-optical disk 243 (MD (Mini-Disk) included), or only a package medium composed of semiconductor memory 244, etc. Instead, it is configured by a ROM 222 in which a program is recorded, a hard disk included in the storage unit 228, and the like provided to the user in a state of being incorporated in the apparatus main body in advance.

  In the present specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. It also includes processes that are executed individually.

  Further, in this specification, the system represents the entire apparatus constituted by a plurality of apparatuses.

It is a block diagram which shows the structure of the information transmission / reception system to which this invention is applied. It is a block diagram which shows the structure of the transmitter of FIG. It is a figure explaining the signal input into the transmitter of FIG. It is a block diagram which shows the structure of the receiver of FIG. 3 is a flowchart illustrating a transmission process of channel A of the transmitter of FIG. It is a figure which shows the example of blanking data. 3 is a flowchart for explaining a transmission process of channel B of the transmitter of FIG. 2. 3 is a flowchart illustrating a transmission process of channel C of the transmitter of FIG. 2. 3 is a timing chart illustrating transmission processing of the transmitter of FIG. 3 is a timing chart for explaining the operation in the vicinity of a blanking period in channel A of the transmitter of FIG. 3 is a timing chart for explaining an operation in the vicinity of a blanking period in channel B of the transmitter of FIG. 2. 3 is a timing chart for explaining an operation in the vicinity of a blanking period in channel C of the transmitter of FIG. 2. 5 is a flowchart for explaining a reception process of channel A of the receiver of FIG. 5 is a flowchart for explaining a reception process of channel B of the receiver of FIG. 4. 5 is a flowchart for explaining a reception process of channel C of the receiver of FIG. 4. 5 is a timing chart for explaining the operation of the receiver of FIG. 4. It is a block diagram which shows the other structural example of the digital tuner of FIG.

Explanation of symbols

  31 digital tuner, 33 monitor, 43 transmitter, 51 receiver, 81A, 81B, 81C switch, 82A, 82B, 82C encryption unit, 83A, 83B, 83C encoder, 84 buffer, 85 timing generation unit, 86 superimposition period table, 101A , 101B, 101C decoder, 102A, 102B, 102C decoding unit, 103 timing generation unit, 104 buffer, 105 overlap period table

Claims (18)

First capturing means for capturing video data;
A second capturing means for capturing audio data;
Setting means for setting a setting period shorter than the blanking period during the blanking period of the video data;
Multiplexing means for multiplexing the audio data in a superposition period corresponding to a difference between a blanking period of the video data and the setting period set by the setting means;
Video data transmitting means for encoding the video data multiplexed with the audio data by the multiplexing means into data having a larger number of bits than the video data and transmitting to the data channel;
Holding means for storing data representing the superposition period ;
Timing control means for controlling the multiplexing timing of the audio data so as to superimpose the audio data during the superposition period represented by the data stored in the holding means ;
The setting period, the audio data is not used in the video data encoded are multiplexed, it is shown in a particular predetermined data, the specific data, for identifying the overlap period corresponding to the video data An information transmitter that represents identification information. The information transmitting apparatus according to claim 1, wherein the blanking period is a horizontal blanking period and a vertical blanking period. The information transmission apparatus according to claim 1, further comprising: a PLL circuit that generates a clock from an input pixel clock and supplies the generated clock to the timing control unit. A buffer for accumulating the audio data and outputting it to the multiplexing means
Information transmission device according to claim 1, further comprising a. It said holding unit holds a correspondence relationship between the identification information and the type of the video data,
Further comprising identification information transmitting means for transmitting the identification information ;
The information transmitting apparatus according to claim 1, wherein the multiplexing unit multiplexes the audio data during the superposition period based on the correspondence relationship held in the holding unit . The information transmission apparatus according to claim 5 , wherein the identification information transmission unit transmits the identification information during a vertical blanking period. The information transmitting apparatus according to claim 1, wherein the identification information is information that can specify a period from a start point to an end point of the set period or a period from the start point to the end point of the superposition period. The information transmitting apparatus according to claim 1, further comprising an encryption unit that encrypts the audio data using a method common to the video data. The multiplexing means multiplexes the synchronization signal, the control signal, or the identification information in the set period,
The video data transmission means includes
Transmitting the video data multiplexed with the synchronization signal in the set period using a first data channel;
Transmitting the video data multiplexed with the control signal during the set period using a second data channel;
The information transmission apparatus according to claim 1, wherein video data in which the identification information is multiplexed is transmitted using a third data channel during the set period. In the information transmitting method of the information transmitting apparatus having the holding means for storing the data representing the overlapping period ,
A first capture step for capturing video data;
A second capturing step for capturing audio data;
A setting step for setting a setting period shorter than the blanking period during the blanking period of the video data;
And a blanking period of the video data, the overlap period corresponding to the difference between the set the set period by the processing in said setting step, a multiplexing step of multiplexing the audio data,
A video data transmission step of encoding the video data multiplexed with the audio data by the processing of the multiplexing step into data having a larger number of bits than the video data and transmitting the data to a data channel ;
A timing control step for controlling the multiplexing timing of the audio data so as to superimpose the audio data in the superposition period represented by the data stored in the holding means ,
The setting period, the audio data is not used in the video data encoded are multiplexed, it is shown in a particular predetermined data, the specific data, for identifying the overlap period corresponding to the video data An information transmission method that represents identification information. A setting period shorter than the blanking period is set during the blanking period of video data, audio data is multiplexed in a superposition period corresponding to the difference between the blanking period of the video data and the setting period, and the audio data Is an information receiving device that receives transmission data that is encoded into data having a larger number of bits than the video data and transmitted to a data channel.
The setting period in which the set in the transmission data, the audio data is shown in a particular predetermined data that is not used in the video data encoded are multiplexed, the specific data, the superimposed corresponding to the video data Represents identification information to identify the period,
Capturing means for capturing video data from the transmission data;
Specifying means for specifying the superimposition period of the video data captured by the capturing means corresponding to the type of the video data;
Separating means for separating the audio data multiplexed in the superposition period identified by the identifying means from the video data captured by the capturing means;
Holding means for storing data representing the superposition period ;
An information receiving apparatus comprising: timing control means for controlling the timing of separation of the audio data so as to separate the audio data multiplexed in the superposition period represented by data stored in the holding means . The information receiving apparatus according to claim 11 , further comprising conversion means for converting the audio data separated by the separation means into continuous data. And detects the setting period of the video data captured by said capturing means, generating means for generating the identification information based on the value of said specific data indicative of the detected said set period
Further comprising a,
The holding unit holds a correspondence relationship between the type of the video data and the identification information;
The information receiving apparatus according to claim 11 , wherein the generation unit generates the identification information based on the correspondence relationship held in the holding unit . The information receiving apparatus according to claim 13 , wherein the generation unit generates the identification information from a blanking signal in a vertical blanking period. The information receiving apparatus according to claim 11 , wherein the identification information is information that can specify a period from a start point to an end point of the superposition period or a period from the start point to the end point of the set period. The information receiving apparatus according to claim 11 , further comprising decompression means for decompressing the audio data. The information receiving apparatus according to claim 11 , further comprising decryption means for decrypting the audio data encrypted by a method common to the video data by a method common to the video data. A setting period shorter than the blanking period is set during the blanking period of video data, audio data is multiplexed in a superposition period corresponding to the difference between the blanking period of the video data and the setting period, and the audio data An information receiving apparatus comprising: storage means for storing data representing the superposition period for receiving transmission data in which video data multiplexed with is encoded into data having a larger number of bits than the video data and transmitted to a data channel Information receiving method,
The setting period in which the set in the transmission data, the audio data is shown in a particular predetermined data that is not used in the video data encoded are multiplexed, the specific data, the superimposed corresponding to the video data Represents identification information to identify the period,
The superimposition period of the transmission data is set corresponding to the type of the video data,
A capturing step of capturing video data from the transmission data;
A specifying step of specifying the superimposition period of the video data captured by the processing of the capturing step corresponding to the type of the video data;
A separation step of separating the audio data multiplexed in the superposition period specified by the processing of the specifying step from the video data acquired by the processing of the capturing step ;
A timing control step of controlling a timing of separating the audio data so as to separate the audio data multiplexed in the superposition period represented by the data stored in the holding means .

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