JP2007311928A - Transmission method, transmission system, transmission method, transmitter, receiving method, and receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to more efficiently transmit data by utilizing a standard such as the HDMI standard wherein the number of transmittable bits is fixedly determined. <P>SOLUTION: In the case that a source side apparatus transmits video data in the unit of 8 bits to a sink side apparatus through the use of a transmission system by using individual transmission lines by each color data or by each of luminance and color difference signals synchronously with a pixel clock, a prescribed number of bits not being an integer multiple of 8 bits is selected for video data of one pixel transmitted from the source side apparatus to the sink side apparatus, the video data in the prescribed number of bits not being an integer multiple of 8 bits are transmitted in a timing synchronously with the pixel clock, other data than the video data in the prescribed number of bits are arranged to a margin transmission period caused by the number of bits being a difference between the prescribed number of bits and the number of bits transmitted for a period of the pixel clock assigned for transmission of one pixel and the source side apparatus transmits the resulting data to the sink side apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transmission method and transmission system suitable for application to a digital video / audio input / output interface standard called HDMI (High-Definition Multimedia Interface) standard, and a transmission method and a transmission device applied to this transmission system. The present invention relates to a receiving method and a receiving apparatus.

  In recent years, what is called an HDMI standard has been developed as an interface standard for transmitting uncompressed digital video data and the like between a plurality of video devices. The HDMI standard is a standard for individually transmitting video data as primary color data of each color in units of pixels (hereinafter, pixels are referred to as pixels). Audio data (audio data) is also transmitted using a video data transmission line during the blanking period of the video data. The primary color data to be transmitted may be the case of transmitting three-channel primary color data (R data, G data, B data) of additive color mixture of red, green, and blue, or the case of luminance and color difference signals such as Y, Cb, and Cr. is there.

  One pixel data of each color is basically composed of 8 bits. Synchronization signals such as a horizontal synchronization signal and a vertical synchronization signal are also transmitted at the timing at which each synchronization signal is arranged. Also, a pixel clock transmission line for video data and a control data transmission line are provided.

  FIG. 8 is a diagram showing an outline of an example in which primary color data (R data, G data, and B data) is transmitted through an interface of the HDMI standard. As for video data, B data, G data, and R data are individually transmitted through three channels of channel 0, channel 1, and channel 2. In the example of FIG. 8, a period for transmitting data of four pixels of pixel 0, pixel 1, pixel 2, and pixel 3 is shown, and data of one pixel of each channel is composed of 8 bits.

  That is, for B data (blue data), 8-bit B0 data is sent during the period of pixel 0 using channel 0. Hereinafter, 8-bit B1 data, B2 data, and B3 data are transmitted from the pixel clock ( (Not shown) and sent sequentially. For G data (green data), 8-bit G0 data is sent during the period of pixel 0 using channel 1, and hereinafter, 8-bit G1 data, G1 data, G2 data, and G3 data are pixel clocks. Sent sequentially in sync with. For R data (red data), 8-bit R0 data is sent during the period of pixel 0 using channel 2, and hereinafter, 8-bit R1 data, R2 data, and R3 data are synchronized with the pixel clock. Sent in order.

  Although not shown in FIG. 8, control data and a pixel clock are transmitted using another channel. For control data, not only transmission of video data from the sending device (source device) to the receiving device (sink device), but also from the receiving device (sink device) to the sending device (source device) Can be transmitted. The source device encrypts data in 8-bit units, and the sink-side device decrypts data from the encryption in 8-bit units.

  As described above, the interface of the HDMI standard is standardized on the assumption that one pixel is transmitted at 8 bits per color. On the other hand, in recent years, it has been studied to increase the color resolution, and it has been proposed that the number of bits per color per pixel is 8 bits or more. For example, it has been proposed that the number of bits per color per pixel is 10 bits or 12 bits.

  FIG. 9 is an example of a transmission state on the assumption that 10-bit data per color per pixel is transmitted using an HDMI standard interface. As described above, the HDMI standard is a standard that assumes that data is transmitted in units of 8 bits, and is configured to transmit 8 bits with 1 pixel clock. In order to transmit 10 bits of data, Two pixel clocks are required. In the example of FIG. 9, the data arrangement is such that 2-pixel data is transmitted with a 3-pixel clock. Phases 0, 1, and 2 shown in FIG. 9 each indicate one period of one pixel clock.

  The data structure of FIG. 9 will be described. For example, for B data, 8 bits of 10 bits of pixel 0 are transmitted during the phase 0 period of channel 0, and the remaining 2 bits of pixel 0 are transmitted during the phase 1 period. And dummy data which is invalid data is sent in the subsequent 2-bit period. Then, 4 bits of 10 bits of the next pixel 1 are sent in the latter 4 bit period of the phase 1 period. In the next phase 2 period, the remaining 6 bits of pixel 1 are sent, and in the subsequent 2 bit period, dummy data which is invalid data is sent. Hereinafter, this arrangement is repeated. Pixel data and dummy data are sent in the same data arrangement for the G data of channel 1 and the R data of channel 2. The period in which the dummy data is arranged is an example, and may be arranged in another period. In the case of the data arrangement shown in FIG. 9, since 1.5 pixel clock periods are required for transmission of one pixel, it is necessary to increase the frequency of the pixel clock accordingly.

  With the data configuration shown in FIG. 9, it is possible to send pixel data with a large number of bits relatively efficiently using an HDMI standard interface assuming that data is transmitted in units of 8 bits. .

Patent Document 1 describes details of the HDMI standard.
WO2002 / 078336

  By the way, there is a demand for more advanced data transmission using this type of interface such as the HDMI standard. That is, the HDMI standard transmits video data and accompanying audio data between a source-side video device and a sink-side video device. What is a transmission line for transmitting video data and audio data? In addition, a transmission line for transmitting control data is also prepared, and control data can be transmitted using the control data line. However, there is a demand for enabling further data to be transmitted simultaneously.

  The present invention has been made in view of the above points, and an object thereof is to enable more efficient data transmission using a standard in which the number of bits that can be transmitted, such as the HDMI standard, is fixedly determined. .

  The present invention is a transmission in which 8-bit video data is transmitted from a source device to a sink device using a separate transmission line for each color data or for each luminance and color difference signal in synchronization with a pixel clock. When video data is transmitted using a method, the predetermined number of bits that are not an integral multiple of 8 bits and the predetermined number of bits that is not an integral multiple of 8 bits are used as one-pixel video data transmitted from the source device to the sink device. The video data is transmitted at a timing synchronized with the pixel clock, and in a margin transmission period that occurs by the number of bits that is the difference between the number of bits transmitted in the period of the pixel clock allocated to the transmission of one pixel and the predetermined number of bits, Data different from video data having a predetermined number of bits is arranged and transmitted from the source side device to the sink side device.

  In this way, the main video data and the main video data can be transmitted by using a margin transmission period generated by the number of bits that is the difference between the number of bits transmitted during the period of the pixel clock assigned to the transmission of one pixel and the predetermined number of bits. Will be able to transmit other various data.

  According to the present invention, the main video data is separated from the main video data by using a margin transmission period generated by a difference between the number of bits transmitted in the period of the pixel clock assigned to the transmission of one pixel and the predetermined number of bits. This makes it possible to transmit both multi-bit pixel data exceeding 8 bits and various data other than the main video data, thereby improving transmission efficiency. improves. Further, this is a transmission mode in which an 8-bit transmission unit defined in the transmission standard is maintained, and encryption and decryption in an 8-bit unit can be performed in a state defined by the standard.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In this example, the present invention is applied to a transmission system that transmits video data or the like from a source device to a sink device according to the HDMI standard. FIG. 1 is a diagram showing an example of the system configuration of this example. A video recording / reproducing apparatus 10 that is a source side device and a television receiver 30 that is a sink side device are connected by an HDMI cable 1 and video. Video data and audio data are transmitted from the recording / reproducing apparatus 10 to the television receiver 30. In the following description, the necessary configuration and the like of the HDMI standard will be described in order, but the existing HDMI standard is basically applied as it is, and the configuration of the HDMI cable 1 is the same as the conventional one.

  First, the video recording / reproducing apparatus 10 will be described. The video recording / reproducing apparatus 10 includes a recording / reproducing unit 11 and can record and reproduce video data and audio data. As the recording / reproducing unit 11, for example, a hard disk drive (HDD) device can be used. Video data obtained by reproduction by the recording / reproducing unit 11 is supplied to the video processing unit 12, and audio data obtained by reproduction is supplied to the audio processing unit 14. Also, a tuner 16 is provided, and video data and audio data received by the tuner 16 are supplied to the video processing unit 12 and the audio processing unit 14.

  The video processing unit 12 performs processing for converting video data obtained by reproduction or reception into video data for transmission. Here, the video processing unit 12 of the present example has a configuration capable of simultaneously processing two systems of video data, and can generate video data for main images and video data for sub-images. For the video data for the main image, for example, one pixel is data of 10 bits per color, and for the video data for the sub image, for example, one pixel is data of 2 bits per color. It is.

  The audio processing unit 14 performs processing for converting audio data obtained by reproduction or reception into audio data for transmission. Here, in the audio processing unit 14 of the present example, the supplied audio data is audio data that performs multi-channel reproduction such as 5.1 channel in addition to audio data having a general data configuration for 2-channel audio reproduction. Is possible. The audio data for 2-channel playback and the audio data for multi-channel playback are configured to be output simultaneously. The audio data for multi-channel reproduction may be bit-compressed audio data.

  The video data and audio data output from the video processing unit 12 and the audio processing unit 14 are supplied to the HDMI transmission processing unit 20. The HDMI transmission processing unit 20 is a circuit unit that performs transmission processing of the interface of the HDMI standard, and is integrated, for example. Video data and audio data supplied to the HDMI transmission processing unit 20 are multiplexed by the multiplexing circuit 21. At the time of multiplexing, for the video data of the main image, 1 pixel data is arranged using a 1.5 pixel clock period. However, since 8 bits per channel can be transmitted in 1 pixel clock period, 12 bits can be transmitted in 1.5 pixel clock period, and there is a margin period generated every 1.5 pixel clock period. In the case of this example, other data is arranged by the multiplexing circuit 21 using a certain two bits.

  As other data, for example, sub-image data generated by the video processing unit 12 is arranged. As already described, the sub-image data is uncompressed video data of 2 bits per pixel per color, and is arranged one pixel at a time during which 2 bits per pixel are generated. However, vertical synchronization data and horizontal synchronization data in the blanking period are transmitted only for the main image, and for the sub image data, vertical synchronization data and horizontal synchronization data dedicated to the sub image data are not transmitted. A specific example of data transmission will be described later. Note that as other data described above, audio data for multi-channel playback may be divided into 2 bits every 1.5 pixel clock periods. Alternatively, control data or incidental information having a relatively large amount of transmission data generated by the control unit 15 of the video recording / reproducing apparatus 10 may be divided into two bits every 1.5 pixel clock periods.

  The 2-channel audio data is multiplexed so as to be transmitted using the blanking period of the channel through which the video data is transmitted. The process of arranging and transmitting the two-channel audio data in the blanking period is a general transmission process formatted according to the HDMI standard.

  Then, the transmission data multiplexed by the multiplexing circuit 21 is encrypted by the HDCP encryption unit 22. The HDCP encryption unit 22 encrypts at least a channel through which video data is transmitted according to the HDCP (High-bandwidth Digital Content Protection System) standard. The encryption here is performed in units of 8-bit data of one channel.

  The data encrypted by the HDCP encryption unit 22 is supplied to the transmission processing unit 23, the pixel data of each color is arranged in an individual channel, and the pixel clock channel and the control data channel also have their corresponding clocks and data. And sent to the HDMI cable 1 connected to the HDMI terminal 24.

  The HDMI cable 1 is connected to the HDMI terminal 41 of the television receiver 30. Data transmitted through the HDMI cable 1 connected to the HDMI terminal 41 is detected (received) by the transmission processing unit 42 in the HDMI transmission processing unit 40 in synchronization with the pixel clock. The detected data of each channel is decrypted by the HDCP decrypting unit 42 from encryption at the time of transmission. The decoding here is also performed in units of 8 bits for each channel.

  The decoded data is supplied to the demultiplexing circuit 44 to separate the data multiplexed on each channel. In this separation process, audio data (two-channel audio data) arranged in a blanking period of a channel through which video is transmitted is separated from video data (main video data). In addition, data arranged in a margin of 2 bits generated every 1.5 pixel clock period is also separated from the video data. If the data arranged in this marginal period is sub-picture data, the sub-picture data is taken out. Further, when the data arranged in the margin period is multi-channel audio data, the multi-channel audio data is extracted. Further, when the data arranged in the margin period is control data or incidental information, the control data or incidental information is extracted.

  The main video data and the sub video data separated by the demultiplexing circuit 44 are supplied to the video selection / synthesis unit 31. The video selection / synthesis unit 31 selects any video based on an instruction from the control unit 36 of the television receiver 30 and supplies the selected video data to the video processing unit 32. The video processing unit 32 performs necessary processing on the supplied video data and supplies the processed video data to the display processing unit 33. The display processing unit 33 performs processing for driving the display panel 60.

  The audio data separated by the demultiplexing circuit 44 is supplied to the audio processing unit 34, performs audio processing such as analog conversion, and the processed output is supplied to the output processing unit 35 to be amplified for driving the speaker. This processing is performed and output from a plurality of speakers 51 to 54 connected to the output processing unit 35. When the audio data supplied to the audio processing unit 34 is 2-channel audio data, 2-channel processing is performed, and when the audio data is multi-channel audio data, multi-channel audio reproduction processing is performed. .

  The control data separated by the demultiplexing circuit 44 is supplied to the control unit 36. Control data can also be sent from the control unit 36 of the television receiver 30 to the control unit 15 on the video recording / reproducing apparatus 10 side using the control data channel.

  FIG. 2 is a diagram illustrating a data configuration example of each channel transmitted through the HDMI cable 1 between the transmission processing unit 23 of the video recording / reproducing apparatus 10 and the transmission processing unit 42 of the television receiver 30. . As shown in FIG. 2, three channels of channel 0, channel 1, and channel 2 are prepared as channels for transmitting video data, and a clock channel for transmitting a pixel clock is also prepared. In addition, a DDC line and a CEC line are prepared as control data transmission channels.

  On the transmission side, transmission processing units (transmission units) 23a, 23b, and 23c are prepared in the transmission processing unit 23 for each channel for transmitting video data, and on the reception side, each channel for transmitting video data is provided. Transmission processing units (data receiving units) 42 a, 42 b, 42 c are prepared in the transmission processing unit 42.

  The configuration of each channel will be described. Channel 0 transmits pixel data of B data, vertical synchronization data, horizontal synchronization data, and auxiliary data. In channel 1, pixel data of G data, two types of control data (CTL0, CTL1), and auxiliary data are transmitted. In channel 2, pixel data of R data, two types of control data (CTL2, CTL3), and auxiliary data are transmitted.

  FIG. 3 is a diagram showing a line configuration and a pixel configuration of one frame transmitted by the transmission configuration of this example. The video data (main video data) transmitted in the case of this example is uncompressed data, and a vertical blanking period and a horizontal blanking period are added. Specifically, in the example of FIG. 3, the display video area (area shown as the active video area) is pixel data of 480 lines × 720 pixels, and the number of lines and the number of pixels including the blanking period is 525. There are as lines and 858 pixels. Areas indicated by double hatching (right and left diagonal lines) during the blanking period are referred to as data islands and are periods during which auxiliary data can be added.

  Next, a state in which data is transmitted using channel 0, channel 1, and channel 2 in which pixel data is transmitted in the transmission configuration of this example will be described with reference to FIG. In the example of FIG. 4, the data arrangement is such that 2-pixel data is transmitted with a 3-pixel clock. An example of sub-image data is data arranged in a margin of 2 bits generated every 1.5 pixel clock period. Phases 0, 1, and 2 shown in FIG. 4 each indicate one period of one pixel clock.

  The data structure of FIG. 4 will be described. For example, for B data, 8 bits of 10 bits of pixel 0 of the main image data are sent in the phase 0 period of channel 0, and the main image data is transmitted in the phase 1 period. The remaining 2 bits of the pixel 0 of the sub image data are sent, and 1 pixel of B data of the sub-image data is sent in the subsequent 2 bit period.

  Then, 4 bits out of 10 bits of the next pixel 1 of the main image data are transmitted in the latter 4 bit period of the phase 1 period. In the next phase 2 period, the remaining 6 bits of pixel 1 of the main image data are sent, and in the subsequent 2 bit period, 1 pixel of B data of the sub-image data is sent. Hereinafter, this arrangement is repeated. For the G data of channel 1 and the R data of channel 2 as well, the pixel data of the main image data and the pixel data of the sub image are transmitted in the same data arrangement. In FIG. 4, data B0, G0, R0, B1, G1, and R1 indicate pixel data of the three primary colors of the main image, respectively. Data BS0, GS0, RS0, BS1, GS1, and RS1 are sub-images, respectively. Three primary color pixel data are shown.

  FIG. 5 is a diagram illustrating another data configuration example. In this example, compared with the example of FIG. 4, the remaining 2 bits of the pixel data of the main image of pixel 0 continued from the previous phase 0 period are sent as the period of phase 1 in the first 2 bit period, Next, 2-bit pixel data of pixel 0 of the sub-image is sent, and further 2-bit pixel data of pixel 1 of the sub-image is sent. Then, in the last 2 bit period of Phase 1, the first 2 bits of the pixel data of the main image of Pixel 1 are sent, and in Phase 2, the pixel data of the remaining 8 bits of the main image of Pixel 1 are sent. . Thus, the example of FIG. 5 is different from the example of FIG. 4 in the position where the pixel data of the sub-image is arranged.

  In the examples of FIGS. 4 and 5, pixel data of the sub-image is used as data other than the pixel data of the main image. However, the same applies when other data such as multi-channel audio data and control data is arranged. What is necessary is just to arrange | position to a position. As the control data, for example, brightness control data of a backlight that requires a display panel may be sent.

  FIG. 6 shows data called VSDB, which is data instructing the configuration of transmission data from the source side when multiplexing other than pixel data of the main image is performed as described above. It is an example in the case of instructing to the sink side. The VSDB data is data transmitted using the DDC line (FIG. 2). In the case of the VSDB in this example, the 6th byte data indicates how many bits each pixel is. In the case of this example, it is indicated that the data is 10 bits for each pixel of one color and a total of 30 bits. Then, the presence / absence of a sub-image is indicated. Instead of the presence / absence data of the sub-image, the presence / absence of addition of multi-channel audio or the presence / absence of addition of control data may be indicated.

  The control unit 36 (FIG. 1) of the sink-side device (television receiver 30) determines the VSDB data, determines the format in which the sub-image is transmitted, and determines the received sub-image. Processing such as data separation and decoding is executed by the demultiplexing circuit 44 and the like, and display using the sub-image is executed correctly.

  More detailed data such as the number of pixels of the sub-image may be sent as the data related to the sub-image sent by VSDB. For example, when there are four types of formats A, B, C, and D as sub-image formats, the lower 4 bits of the sixth byte data are used to indicate which of the four types is used. It is good also as a structure. The details of the formats A, B, C, and D may be transmitted separately to notify the sink side device. For example, format A has the same number of pixels as the main image, one pixel of each color is 2 bits, and the main image and the sub-image have the same frame rate, and format B is 1/4 pixel of the main image. The number of pixels of each color is 8 bits, and the main image and the sub-image have the same frame rate, and the details of the data structure of the sub-image may be transmitted and notified.

  In this example, the VSDB data is used to instruct the multiplexed data example from the source side. However, in order to indicate the capability of the data that can be received by the sink side device (the capability of display processing), Similar data may be sent to the source side. That is, when the connected devices are mutually authenticated, the control unit of the sink-side device indicates its display processing capability to the source side using VSDB data (or other data). The control unit on the source side is configured to transmit the sub-image data in a format that matches the capability. By doing so, an appropriate transmission state of the sub-image data is obtained.

  The sub-image data is transmitted using the VSDB data transmitted through the DDC line as an example, and other data sections transmitted between the source side device and the sink side device. May be used to transmit similar data. For example, additional information indicating that data including a sub-image is transmitted may be arranged in a part of the data island section in the blanking period shown in FIG.

Here, in the transmission configuration of this example, when verifying the amount of data that can transmit a sub-image, for example, when the frequency of the clock channel is about 225 MHz,
225MHz * (3ch * 8bit) * ((12bit-10bit) / 12bit) = 900Mbps
Therefore, data up to about 900 Mbps can be transferred.
Further, when verifying from the number of pixels of the main image, for example, when the main image is 1920 pixels × 1080p and 60 Hz, the sub-picture becomes, for example, 2 ^ 6 = 64 colors and 1920 pixels × 1080p 60 Hz. Images are sent in sync with the main video. As another example, if the main video is 1920 pixels x 1080p and 60Hz, the resolution of the sub-image is 960 pixels x 540p, which is half the length and width of the main image. The sub-picture is obtained. In addition, a sub-picture of SD resolution of 60 Hz of 720 pixels × 480p with 12 bits per pixel for each color can be sent in synchronization with the main picture. In this way, the sub-image can arbitrarily change the combination of the multi-bit color and the number of pixels within a range that does not exceed the transmission rate of the surplus data (dummy data in FIG. 9) in the transmission of the main image. Can do.

  FIG. 7 shows an example of a main image and a sub image. In this example, the main image displayed on the television receiver 30 is an aerial photograph (satellite photograph) image 61 of a specific location, and a map image of that location is a sub-image 62. By sending and displaying the related main image and sub-image in this way, the images can be used properly. In the case of this example, the main image and the sub-image can be transmitted with the bit positions and the like being completely synchronized, so that the synchronization data of the main image can be used in common. Good transmission is possible.

  In this way, by applying the transmission processing of this example, the number of bits of main image data can be increased to the number of bits of one transmission unit, and the sub-image is utilized by using the remaining bit positions at that time. Thus, it is possible to achieve both the increase in the number of bits and the improvement in transmission efficiency.

  In the embodiment described so far, an example in which data of 10 bits per pixel is transmitted. However, 12 bits, 14 bits, etc., which are different from the basic number of transmission bits (here, 8 bits) are used. When transmitting data, other data such as a sub-image may be transmitted in the remaining bit section in that case.

  Further, the present invention may be applied to other formats that can be transmitted in the number of bits, such as a format in which one pixel can be transmitted in units of 16 bits. The unit of encryption and decryption may be applied to a unit that performs processing in units of other bits such as 16 bits.

  In the above-described embodiment, the description has been made on the premise of the interface of the HDMI standard, but the present invention can be applied to other similar transmission standards.

It is a block diagram which shows the system configuration example by one embodiment of this invention. It is explanatory drawing which shows the example of a transmission channel structure by one embodiment of this invention. It is explanatory drawing which shows the bit structural example by one embodiment of this invention. It is explanatory drawing which shows the data packing example (Example 1) by one embodiment of this invention. It is explanatory drawing which shows the data packing example (Example 2) by one embodiment of this invention. It is explanatory drawing which shows the data structural example of VSDB by one embodiment of this invention. It is explanatory drawing which shows the example of a display of the main image by one embodiment of this invention, and a subimage. It is explanatory drawing which shows the data packing example (example of 1 pixel 8 bits) of HDMI specification. It is explanatory drawing which shows the data packing example (example of 1 pixel 10 bits) of HDMI specification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... HDMI cable, 10 ... Video recording / reproducing apparatus (source side apparatus), 11 ... Recording / reproducing part, 12 ... Video processing part, 14 ... Audio processing part, 15 ... Control part, 16 ... Tuner, 20 ... HDMI transmission processing part , 21 ... Multiplexing circuit, 22 ... HDCP encryption unit, 23 ... Transmission processing unit, 24 ... HDMI terminal, 30 ... Television receiver (sink side device), 31 ... Video selection / synthesis unit, 32 ... Video processing unit, 33 ... Display processing unit, 34 ... Audio processing unit, 35 ... Output processing unit, 36 ... Control unit, 40 ... HDMI transmission processing unit, 41 ... HDMI terminal, 42 ... Transmission processing unit, 43 ... HDCP decoding unit, 44 ... Demultiplexing circuit, 51-54 ... speaker, 60 ... display panel

Claims (13)

A transmission method is used in which 8-bit video data is transmitted from the source device to the sink device using a separate transmission line for each color data or each luminance and color difference signal in synchronization with the pixel clock. A transmission method for transmitting video data,
As one-pixel video data transmitted from the source device to the sink device, a predetermined number of bits that is not an integer multiple of 8 bits is used.
Transmit video data of a predetermined number of bits that is not an integer multiple of the 8 bits at a timing synchronized with the pixel clock,
Data different from the video data having the predetermined number of bits is arranged in a transmission period having a margin corresponding to the difference between the number of bits transmitted in the period of the pixel clock allocated to transmission of one pixel and the predetermined number of bits. And transmitting from the source device to the sink device. The transmission method according to claim 1,
The source side device encrypts data to be sent to each transmission line in units of 8 bits,
A transmission method characterized in that the sink side device decodes data received via each transmission line in units of 8 bits. The transmission method according to claim 1,
The transmission method according to claim 1, wherein the different data is sub-video data different from the video data. The transmission method according to claim 1,
The transmission method, wherein the other data is voice data. The transmission method according to claim 1,
The transmission method according to claim 1, wherein the other data is incidental information. A transmission method is used in which 8-bit video data is transmitted from the source device to the sink device using a separate transmission line for each color data or each luminance and color difference signal in synchronization with the pixel clock. A transmission system for transmitting video data,
As the source side device,
A video data generation unit that generates video data of a predetermined number of bits in which one pixel of video data is not an integer multiple of 8 bits;
Bits transmitted in the period of the pixel clock assigned to the transmission of one pixel by arranging the video data of the predetermined number of bits generated by the video data generation unit in the video data transmission period of the 8-bit unit of the transmission method A transmission data arrangement unit that arranges data different from the video data of the predetermined number of bits and makes data in units of 8 bits in a marginal transmission period that occurs by the number of bits that is the difference between the number and the predetermined number of bits,
A sending unit for sending the data in units of 8 bits arranged in the transmission data arranging unit to the transmission line in synchronization with the pixel clock;
As the sink side device,
A receiving unit for detecting data received from the transmission line in units of 8 bits in synchronization with the pixel clock;
A data separation unit for separating the video data of the predetermined number of bits and the other data transmitted during the extra transmission period from the 8-bit unit data received by the reception unit. Transmission system. The transmission system according to claim 1, wherein
The source device includes an encryption unit that encrypts transmission data arranged in the transmission data arrangement unit in units of 8 bits, and transmits the transmission data encrypted by the encryption unit from the transmission unit. And
The sink side device includes a decoding unit that decodes transmission data received by the receiving unit in units of 8 bits, and the transmission data decoded by the decoding unit is separated by the data separation unit. A transmission system characterized by A transmission method for transmitting video data using a transmission method in which video data in units of 8 bits is transmitted using individual transmission lines for each color data or each luminance and color difference signal in synchronization with the pixel clock. There,
As one-pixel video data to be transmitted, a predetermined number of bits that is not an integral multiple of 8 bits is used.
Transmitting video data of a predetermined number of bits that is not an integer multiple of the 8 bits at a timing synchronized with the pixel clock;
Furthermore, data different from the video data of the predetermined number of bits in a margin transmission period that occurs by the number of bits that is the difference between the number of bits transmitted during the period of the pixel clock assigned to transmission of one pixel and the predetermined number of bits. And transmitting from the source side device to the sink side device. A transmission device that transmits video data using a transmission method in which video data in units of 8 bits is transmitted using individual transmission lines for each color data or for each luminance and color difference signal in synchronization with the pixel clock. There,
A video data generation unit that generates video data of a predetermined number of bits in which one pixel of video data is not an integer multiple of 8 bits;
Bits transmitted in the period of the pixel clock assigned to the transmission of one pixel by arranging the video data of the predetermined number of bits generated by the video data generation unit in the video data transmission period of the 8-bit unit of the transmission method A transmission data arrangement unit that arranges data different from the video data of the predetermined number of bits and makes data in units of 8 bits in a marginal transmission period that occurs by the number of bits that is the difference between the number and the predetermined number of bits,
A transmission apparatus, comprising: a transmission unit configured to transmit data in units of 8 bits arranged in the transmission data arrangement unit to the transmission line in synchronization with the pixel clock. The transmission device according to claim 9, wherein
An encryption unit that encrypts transmission data arranged in the transmission data arrangement unit in units of 8 bits is provided, and the transmission data encrypted by the encryption unit is sent out from the sending unit. Transmitter device. A receiving method for receiving video data using a transmission method in which video data in units of 8 bits is transmitted using individual transmission lines for each color data or each luminance and color difference signal in synchronization with the pixel clock. There,
As the one-pixel video data to be received, a predetermined number of bits that is not an integer multiple of 8 bits,
Receiving video data of a predetermined number of bits that is not an integer multiple of the 8 bits at a timing synchronized with the pixel clock;
Different from the video data having the predetermined number of bits, which is arranged in a marginal transmission period generated by the difference between the number of bits transmitted in the period of the pixel clock allocated to transmission of one pixel and the predetermined number of bits. A receiving method characterized by separating data. A receiving device that receives video data using a transmission method in which video data in units of 8 bits are transmitted using individual transmission lines for each color data or each luminance and color difference signal in synchronization with the pixel clock. There,
A receiving unit for detecting data received from the transmission line in units of 8 bits in synchronization with the pixel clock;
From the data in units of 8 bits received by the receiving unit, video data having a predetermined number of bits that is not an integer multiple of the 8 bits, the number of bits transmitted during the period of the pixel clock assigned to transmission of one pixel, and the predetermined number of bits And a data separation unit that separates another data transmitted in a transmission period having a margin corresponding to the number of bits corresponding to the difference. The receiving device according to claim 12,
A receiving apparatus comprising: a decoding unit that decodes transmission data received by the receiving unit in units of 8 bits; and the transmission data decoded by the decoding unit is separated by the data separation unit .