JP2003143560A - Method and device for data transmission and method and device for data reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a compressed digital video signal so that it can be surely reproduced on the reception side, by a transmission system in which word string data which is based on data to be transmitted and is obtained by 8B/10B conversion and insertion of word synchronizing data is converted to serial data and is transmitted. SOLUTION: The compressed digital video signal consisting of a series of compressed data presence parts and compressing data absence parts alternately is subjected to 8B/10B conversion to obtain converted 10-bit word string data, and an additional word data group including word synchronizing data having a preliminarily set code is inserted to the compressed data absence parts to form composite 10-bit word string data, and the composite 10-bit word string data is converted to serial data and is sent to be transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention described in the claims of the present application is a compressed digital video signal forming word string data obtained by subjecting a digital video signal to data compression in units of a predetermined division period. In the data transmission method and the implementation thereof, the word synchronization data is inserted in to obtain the transmission word string data having a predetermined transmission speed, and the transmission word string data is converted to serial data and transmitted. The present invention relates to a data transmission device to be used, a data receiving method for receiving the serial data sent by the data transmitting method and the data transmitting device, and reproducing a compressed digital video signal, and a data receiving device used for the implementation.

[0002]

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

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

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

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

Further, in a digital data transmission system such as a fiber channel system, for example, digital data transmitted as 10-bit word string data is as shown in FIG. It is intended to follow a data format in which a minimum number of independent packets called "frames" are formed. The "frame" shown in FIG. 15 is composed of 2148 bytes as a whole, and its contents are a 4-byte frame start part, a 24-byte frame header part, and a 64-byte optional header part. , A payload portion of 2048 bytes, an error check portion of 4 bytes, and a frame end portion of 4 bytes are successively arranged.

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

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

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

Such word synchronization data is, for example,
The word data DS10 has a 10-bit structure and is code-named K28.5. Figure 16 shows K2
A word data DS10 having a 10-bit structure called by a code name of 8.5 is shown.
0 is "00" that makes RD positive when CRD, which is the RD based on the word data arranged immediately before that, is negative (-).
11111010 ", and when the CRD, which is the RD based on the immediately preceding word data, is positive (+), it is set to" 11100000101 "with RD being negative (hereinafter," 0011111010 "is + K28.5. Also, "1100000101" is referred to as -K28.5).

On the other hand, in the field of video signals, digitization has been attempted from the viewpoint of diversifying transmission information and improving the quality of reproduced images. For example, digital data (image A high-definition television (HDTV) system or the like that handles a digital video signal formed by information data) has been proposed. The digital video signal (HD digital video signal) under the HDTV system follows the data format as shown in FIG. 17, for example.

The data format for the digital video signal shown in FIG. 17 includes a luminance signal data series (Y data series) representing a luminance signal component in the video signal and a B format in FIG. 17, as shown in A of FIG. And a color difference signal data series (P _B / P _R data series) representing a color difference signal component in the video signal, the Y data series and the P _B / P _R data series are respectively
The luminance signal information data forming a digital image signal and the color difference signal information data forming a digital image signal are shown.

Each of the word data forming each of the Y data sequence and the P _B / P _R data sequence has a 10-bit structure. That is, each of the luminance signal information data represented as the Y data sequence and the color difference signal information data represented as the P _B / P _R data sequence is image information data quantized with 10 bit words. 17A shows a portion corresponding to a part of the line blanking period in each line period of the Y data series and the video data period before and after the line blanking period,
17B shows a portion corresponding to a part of the line blanking period in each line period and the video data period before and after it in the P _B / P _R data series.

In the Y data series, immediately before the portion corresponding to each video data period, 4 words (3FF (Y), 000 (Y), 000) each consisting of 10 bits are formed.
Timing reference code data (SAV: Start of Active Video) composed of (Y), XYZ (Y)) is arranged, and each of them has a 10-bit structure immediately after the portion corresponding to each video data period. Word (3FF (Y),
000 (Y), 000 (Y), XYZ (Y)) timing reference code data (EAV: End of Active)
Video). Similarly, even in the P _B / P _R data series, immediately before the portion corresponding to each video data period, each of 4 words (3FF
(C), 000 (C), 000 (C), XYZ (C))
SAV consisting of 4 words (3FF (C), 000 (C), 000 (C), 000 (C)
An EAV composed of (C) and XYZ (C)) is arranged. Of course, each of the EAV and SAV in the Y data series is arranged in a portion corresponding to each line blanking period in the Y data series, and the EAV in the P _B / P _R data series.
And SAV are arranged in the portion corresponding to each line blanking period in the P _B / P _R data series.

When a digital video signal according to a data format composed of such Y data series and P _B / P _R data series is transmitted, the Y data series and P _B / P _B / P
The P _R data series is subjected to word multiplexing processing under the condition that the parts corresponding to the line blanking periods in which the respective EAVs are arranged are synchronized to form a word multiplex data series as shown in FIG. To be done.

In such an HD digital video signal,
For interlaced scanning in which each frame image is formed by being divided into a first field image and a second field image, and for sequential scanning in which each frame image is formed without being divided into a first field image and a second field image There is a need. The interlaced scanning HD digital video signal is 10-bit word string data having a transmission rate of, for example, 148.5 MBps, and the progressive scanning HD digital video signal has a transmission rate which is H.
Twice the case of a D digital video signal, for example 148.
It is 10-bit word string data with 5 MBps × 2 = 297 MBps.

Further, since the image information data for forming the HD digital video signal for interlaced scanning or the HD digital video signal for progressive scanning usually has a huge data amount, for example, its transmission and recording are performed. When performing the above, it is desired that the data is compressed so that the data amount can be reduced without substantially lowering the data quality. Therefore, regarding image information data, various researches and developments of data compression techniques have been carried out to reduce the amount of the data, and one of the achievements is the image information data representing the moving image information. Regarding data compression, as a method of implementing it, MPEG (Moving), which is a working group under the Technical Committee under the international standardization body
A standard method called MPEG has been proposed, which has been reviewed by the Picture Experts Group) and approved as a standard.

In the standard system called MPEG, the image information data is compressed by high-efficiency coding, but the MP for the image information data is processed.
When data compression by high-efficiency coding according to EG is performed, data compression with an extremely high compression rate can be realized,
Moreover, there is an advantage that an image reproduced based on the data-compressed digital image information data can be of high quality. Digital image information data (MPEG image information data), which has been subjected to data compression by high-efficiency encoding according to MPEG, generally forms 8-bit word string data.

When data compression processing using MPEG is performed on the above-described interlaced scanning HD digital video signal or progressive scanning HD digital video signal, for example, interlaced scanning HD digital video signal or sequential scanning is performed. For HD digital video signals for scanning,
Data compression is performed in units of one frame period, which is the divided period. That is, the image information data representing each frame period in the HD digital video signal for interlaced scanning or the HD digital video signal for progressive scanning is subjected to data compression by high-efficiency encoding according to MPEG, and thereby obtained. The compressed data that is the 8-bit word string data that is generated is sequentially formed.

As a result, a compressed digital video signal (compressed digital video signal) based on an HD digital video signal for interlaced scanning is formed by alternately connecting a portion with compressed data and a portion without compressed data to form 8-bit word string data. DCI) or a compressed digital video signal (compressed digital video signal DCP) based on an HD digital video signal for progressive scanning, in which a portion with compressed data and a portion without compressed data are alternately connected to form 8-bit word string data. ) Is formed. In such a compressed digital video signal DCI or DCP, one frame period includes a portion where compressed data formed by data compression by high efficiency encoding according to MPEG exists and a portion where the following compressed data does not exist. It will be formed by and.

FIG. 19 shows a compressed digital video signal DCI.
Alternatively, an example of DCP is shown. 19A shows the continuation of each frame period (1 frame) in the compressed digital video signal DCI or DCP, and in each frame period, a portion where compressed data exists and a portion where compressed data does not exist (blank) Are lined up.

FIG. 19B shows a sequence layer forming compressed data. The sequence layer indicates that the sequence header code (SHC: 000001B3 (h), (h) is in hexadecimal notation. The same shall apply in Section 1.), a plurality of group of pictures (GOP) are concatenated with it, and end with a sequence end code (SEC: 000001B7 (h)). FIG. 19
C of the GOP that constitutes the sequence layer,
Is the group start code (GSC: 00000
1B8 (h)), and a plurality of pieces of picture data are arranged in a row. D of FIG. 19 shows the picture data forming the GOP, and the picture data is the picture start code (PSC: 00000100).
(H)), and a plurality of slice data are arranged in a row.

Further, E of FIG. 19 shows slice data forming the picture data, and the slice data starts with slice information, and a plurality of macroblock data are arranged in succession. F of FIG. 19 shows the macroblock data which comprises slice data, The macroblock data starts with macroblock information, and it is comprised by linking several block data in it. 19G
Indicates block data forming macroblock data, and the block data is discrete cosine transform (DCT).
The DCT data obtained by Note that arrow t in FIG. 19 indicates the passage of time.

[0024]

The transmission of compressed digital video signals such as the above-mentioned compressed digital video signals DCI or DCP formed by performing data compression processing using MPEG is also compressed at the transmitting side. 8B / 10B conversion and addition of word synchronization data are performed on data forming a digital video signal, 8B / 10B conversion based on data to be transmitted is performed, and word string data including word synchronization data is formed. Then, the word sequence data is converted into serial data and transmitted so that it can be reliably reproduced at the receiving side. Element (I
This is desirable from the viewpoint of effectively using C element).

Further, 8B / 10B conversion and word synchronization data are added to the data forming the compressed digital video signal to be transmitted, and 8B / 10B conversion based on the data to be transmitted is performed and the word is also added. It is desired to transmit a compressed digital video signal such as a compressed digital video signal DCI or DCP having a transmission system in which word string data including synchronization data is formed, and the word string data is converted into serial data and sent out. Under the circumstances, for example, in the case where either the compressed digital video signal DCI or DCP is to be transmitted, the data forming the compressed digital video signal to be transmitted is accurately determined, If it is possible to properly transmit at an appropriate transmission speed, the same transmission system Thus compressed digital video signal DC
Since either I or DCP can be transmitted, it is extremely convenient, and the range of use for compressed digital video signals such as the compressed digital video signal DCI or DCP can be expanded. Then, the expansion of the range of use of the compressed digital video signal such as the compressed digital video signal DCI or DCP will lead to the further development of the technology in the field of commercial or household electronic devices, for example.

However, in the past, MPEG was used.
A compressed digital video signal formed by performing a data compression process using
0B conversion and addition of word synchronization data are performed, 8B / 10B conversion is performed based on the data to be transmitted, and word string data including word synchronization data is formed, and the word string data is serial data. There is no concrete example in which a transmission system that can be transmitted so as to be reliably reproduced on the receiving side is realized by a transmission method that is converted into and transmitted. Also, the word string data obtained by 8B / 10B conversion and addition of word synchronization data to the data forming the compressed digital video signal formed by performing the data compression processing using the MPEG is received on the receiving side. It is not possible to find a document or the like that describes a technique related to a transmission system that can transmit a compressed digital video signal by surely reproducing it.

Further, in the prior art, 8B / 1 for the data forming the digital video signal to be transmitted.
0B conversion and addition of word synchronization data are performed, 8B / 10B conversion is performed based on the data to be transmitted, and word string data including word synchronization data is formed, and the word string data is serial data. The compressed digital video signal D is transmitted when the compressed digital video signal is transmitted by the transmission method converted into
Whichever compressed digital video signal such as CI or DCP is to be transmitted,
There is no specific example in which a transmission system is realized in which the data forming the transmitted compressed digital video signal is accurately discriminated and the data can be properly transmitted at an appropriate transmission speed. Further, a technique relating to a transmission system capable of appropriately transmitting data forming either a compressed digital video signal such as the compressed digital video signal DCI or DCP in this way at an appropriate transmission speed is described. And so on.

In view of the above point, the invention described in the claims of the present application provides a compressed digital video signal formed by performing data compression processing using MPEG, for example, with 8B for the data forming the compressed digital video signal. / 10B conversion and addition of word synchronization data are performed, 8B / 10B conversion is performed based on the data to be transmitted, and word string data including the word synchronization data is formed, and the word string data is serialized. A data transmission method that can be transmitted so as to be reliably reproduced on the receiving side by using a transmission method that is converted into data and sent out, a data transmission device used for the implementation, and such a data transmission method and data transmission A data receiving method for receiving serial data sent from a device and reproducing a compressed digital video signal, and an implementation thereof. To provide a data receiving apparatus to be.

Further, according to the invention described in the claims of the present application, 8B / 10B conversion and word synchronization data are added to the data forming the compressed digital video signal to be transmitted, and the data is transmitted. 8B / 10B conversion based on the power data, word string data including word synchronization data is formed, the word string data is converted into serial data, and the compressed digital video signal is converted by a transmission method. In transmitting, whether the compressed digital video signal DCI or the compressed digital video signal such as DCP is supposed to be transmitted, the data forming the transmitted compressed digital video signal is accurately transmitted. Discriminate,
A data transmission method capable of being properly transmitted at an appropriate transmission rate, a data transmission apparatus used for the same, and further receiving and compressing serial data sent by the data transmission method and the data transmission apparatus. Provided are a data receiving method for reproducing a digital video signal, and a data receiving apparatus used for implementing the method.

[0030]

A data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application is a digital video signal in which a unit of a predetermined division period is used. 8B / 10B conversion processing is performed on a compressed digital video signal in which a portion in which compressed data obtained by performing the above-described data compression and a portion in which such compressed data does not exist are alternately arranged and compressed. A composite word is formed by forming converted word string data based on a digital video signal, and inserting an additional word data group containing word synchronization data having a preset code in a portion of the converted word string data where no compressed data exists. It is supposed to obtain column data, convert compound word column data into serial data, and send the serial data for transmission. That.

Further, in the data transmission method according to the invention described in any one of claims 8 to 14 in the claims of the present application, the data compression method is applied to the digital video signal in units of a predetermined division period. The clock frequency of the compressed digital video signal in which the compressed data obtained by applying the compressed data and the non-compressed data are alternately arranged is determined, and the determined clock frequency is determined according to the determined clock frequency. In addition to obtaining the determination output signal, the compressed digital video signal is subjected to 8B / 10B conversion processing to form converted word string data based on the compressed digital video signal, and the converted word string data is preliminarily recorded in a portion where no compressed data exists. The process of inserting the additional word data group containing the word synchronization data having the set code is executed by the discrimination output signal. Is performed in a manner corresponding to the above, to form composite word string data whose transmission speed corresponds to the determination output signal, convert the composite word string data into serial data, and send the serial data for transmission. To be taken.

On the other hand, in the data transmission device according to the invention described in claim 15 or 16 in the claims of the present application, the digital video signal is subjected to data compression in units of a predetermined division period. The compressed digital video signal in which the obtained compressed data portion and the portion in which such compressed data does not exist are alternately arranged,
8B / 10B conversion means for performing B / 10B conversion processing to form converted word string data based on the compressed digital video signal, and a portion of the converted word string data obtained from the 8B / 10B converting means where no compressed data exists, Synchronous data insertion means for inserting additional word data groups containing word synchronous data having a preset code to form composite word string data, and composite word string data obtained from the synchronous data insertion means are converted into serial data. Data transmission means for transmitting the serial data to transmit the serial data.

Further, the data transmission apparatus according to the invention described in any one of claims 17 to 19 in the claims of the present application compresses the digital video signal in units of a predetermined division period. By determining the clock frequency of the compressed digital video signal in which the compressed data obtained by applying the compressed data and the non-compressed data are alternately arranged, the clock frequency is determined according to the determined clock frequency. Clock frequency discrimination means for obtaining a discrimination output signal, 8B / 10B conversion means for subjecting the compressed digital video signal to 8B / 10B conversion processing to form conversion word string data based on the compressed digital video signal,
A process of inserting an additional word data group including word synchronization data having a preset code into a portion where the compressed data does not exist in the converted word string data obtained from the B / 10B conversion means corresponds to the determination output signal. By doing so, the synchronous data inserting means for forming the composite word string data that makes the transmission rate according to the discrimination output signal, and the composite word string data obtained from the synchronous data inserting means are converted into serial data. Data transmission means for transmitting serial data to transmit,
It is configured with.

Further, in the data receiving method according to the invention described in claim 20 of the present application, the composite word sequence data including the word synchronization data having the preset code is formed by conversion. Received serial data, converts the received serial data into composite word sequence data including word synchronization data by S / P conversion processing, separates the word synchronization data from the composite word sequence data, and converts the converted word. Obtained by obtaining column data, subjecting the obtained converted word sequence data to 10B / 8B conversion processing, and subjecting the digital video signal to data compression based on the converted word sequence data in units of predetermined division periods. Reproduces a compressed digital video signal in which a portion with compressed data and a portion without such compressed data are alternately arranged. It is shall.

Further, the data receiving device according to the invention described in claim 21 of the present application is formed by converting the composite word string data including the word synchronization data having the preset code. Receiving means for receiving the serial data, S / P converting means for converting the serial data received by the receiving means into composite word string data including word synchronization data, and S / P Word data separating means for separating the word synchronization data from the composite word string data obtained from the converting means to obtain converted word string data, and the converted word string data obtained from the word data separating means are subjected to 10B / 8B conversion processing, Obtained by performing data compression on the digital video signal based on the converted word string data in units of a predetermined segment period. A portion compressed data is present, a portion such compressed data is not present, comprises a 10B / 8B conversion means for reproducing a compressed digital video signal comprising continuous alternately and configured.

As described above, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, and claim 15 or claim in the claims of the present application In the data transmission device according to the invention described in Item 16, the composite word string data based on the compressed digital video signal, which is converted into serial data and sent out for transmission, is converted into 8B / compressed digital video signal. Obtained by 10B conversion,
It is assumed to include word synchronization data to which a predetermined code is assigned. The word synchronization data to which such a predetermined code is assigned is, for example, + K28.5 which is the word data DS10 in which RD is positive or -K which is the word data DS10 in which RD is negative.
It is set to 28.5.

Then, the composite word string data including the word synchronization data to which the predetermined code is assigned, which is transmitted as serial data, is assigned the predetermined code on the receiving side which receives it. The word synchronization data thus obtained will be properly detected as the word synchronization data required for the S / P conversion processing and the processing for reproducing the compressed digital video signal from the word string data. Moreover, since 8B / 10B conversion is performed, good transmission quality can be obtained. Therefore, on the receiving side, the reproduction of the composite word string data based on the received serial data and the reproduction of the compressed digital video signal are surely performed.

[0038] Further, the data transmission method according to the invention described in any one of claims 8 to 14 in the claims of the present application, and claims 17 to 19 in the claims of the present application. In the data transmission device according to the invention described in any of the above, it is possible to determine whether the input compressed digital video signal is, for example, the compressed digital video signal DCI or the compressed digital video signal DCP. This is performed accurately by determining the clock frequency of the compressed digital video signal, and a determination output signal according to the determination result is obtained. Then, for example, the conversion word string data is formed by 8B / 10B conversion for the data forming the compressed digital video signal which is the compressed digital video signal DCI or DCP, and further, the word synchronization is performed with the conversion word string data. The process of inserting the additional word data group including the data is properly performed in a manner corresponding to the discrimination output signal, and the composite word string data having the transmission rate according to the discrimination output signal is formed.

The compound word string data thus obtained is
For example, compressed digital video signal DCI or DCP
, Which is based on the input compressed digital video signal, but the transmission speed of which is determined according to the determination output signal. Suitable for either signal DCI or DCP. Then, the composite word sequence data that makes the transmission rate suitable for the input compressed digital video signal is converted into serial data and transmitted, which includes word synchronization data having a preset code. It is supposed to be. The word synchronization data having such a preset code is, for example, the word data DS1 whose RD is positive.
It is set to + K28.5 which is 0 or -K28.5 which is the word data DS10 in which RD is negative.

In the composite word string data thus converted into serial data and sent out, the word synchronization data having a preset code is converted into, for example, the compressed digital video signal DCI or DCP on the receiving side. It is supposed that the word synchronization data is properly detected as the word synchronization data required for the processing for reproducing the compressed digital video signal. In addition, since the word string data other than the word synchronization data included in the composite word string data converted into the serial data and transmitted is obtained through the 8B / 10B conversion process, good transmission quality can be obtained. Will bring. Therefore, on the receiving side, the reproduction of the composite word string data based on the serial data received under the condition that the good transmission quality is obtained, and further, the compression of the compressed digital video signal DCI or DCP, for example, is performed. A state in which the data synchronization state required for the processing for reproducing the digital video signal is reliably obtained is ensured.

Based on the above, the data transmission method according to the invention described in any one of claims 8 to 14 in the scope of claims of the present application, or claim 17 in the scope of claims of the present application According to the data transmission device of the invention described in any one of claims 19 to
8B / 10B conversion and addition of word synchronization data are performed on the data to be transmitted, and 8B / 10B conversion based on the data to be transmitted is performed and word string data including the word synchronization data is formed. In transmitting a compressed digital video signal by a transmission method in which the word string data is converted into serial data and transmitted, for example, either the compressed digital video signal DCI or DCP should be transmitted as the compressed digital video signal. Even if it is assumed that the data forming the compressed digital video signal to be transmitted is accurately discriminated, it can be properly transmitted with an appropriate transmission speed while obtaining good transmission quality. It will be possible to transmit.

Furthermore, according to the data receiving method according to the invention described in claim 20 of the present application, or the data receiving device according to the invention described in claim 21 of the present application. For example, for example, the data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application,
Alternatively, the serial data transmitted by the data transmission device according to the invention described in any one of claims 15 to 19 in the claims of the present application is received, and the received serial data has S / P. Conversion processing is performed, and further, separation of word synchronization data and 10B /
8B conversion is performed, and a portion where compressed data obtained by subjecting the digital video signal to data compression in units of a predetermined division period and a portion where such compressed data does not exist are alternately arranged. The compressed digital video signal composed of is surely reproduced.

[0043]

1 is a block diagram of a data transmission method according to an embodiment of the present invention, in which an example of a data transmission method according to the present invention is implemented. Claims 15 to 19 in the range of
An example of the data transmission device according to the invention described in any of the above will be shown.

In the example shown in FIG. 1, the compressed digital video signal DCI or the compressed digital video signal D
The CP is supplied to the composite word string data forming unit 11 as a compressed digital video signal to be transmitted.

The compressed digital video signal DCI is, for example, obtained by subjecting the HD digital video signal for interlaced scanning to data compression in units of a predetermined division period, thereby, for example, the division period in the HD digital video signal for interlaced scanning. Image information data representing one frame period, which is one minute, is obtained by subjecting the image information data to data compression by high-efficiency encoding according to MPEG.
An 8-bit word string data is formed by alternately connecting a portion where compressed data exists and a portion where there is no compressed data (blank) based on the D digital video signal. For example, compression having a data structure as shown in FIG. It is a digital video signal. In the compressed digital video signal DCI, each set of a portion where compressed data exists and a portion where compressed data does not form one frame period. The compressed digital video signal DCI is 8-bit word string data having a word transmission rate of, for example, 74.25 MBps.
The clock frequency of CI is, for example, 74.25 MHz.

The compressed digital video signal DCP is, for example, each frame in the HD digital video signal for progressive scanning by performing data compression on the HD digital video signal for progressive scanning in units of a predetermined division period. Image information data representing a period is subjected to data compression by high efficiency encoding according to MPEG, and is obtained based on an HD digital video signal for progressive scanning.
The 8-bit word string data is formed by alternately connecting the portion where the compressed data exists and the portion where the compressed data does not exist, for example,
It is a compressed digital video signal having a data structure as shown in FIG. This compressed digital video signal DC
In P, each pair of a portion where compressed data exists and a portion where compressed data does not form one frame period. The compressed digital video signal DCP is 8-bit word string data having a word transmission rate of, for example, 148.5 MBps. Therefore, the clock frequency of the compressed digital video signal DCP is, for example, 148.5.
MHz.

The composite word string data forming section 11 is provided with a compressed digital video signal DCI or D supplied thereto.
The horizontal synchronizing signal SH and the vertical synchronizing signal SV respectively synchronized with the CP line period and field period or frame period, and the frequency of the compressed digital video signal DCI or DCP supplied thereto are set to 74.25M.
A word clock signal CX having a frequency of Hz or 148.5 MHz is supplied, and a clock signal CA having a frequency of 50 MHz is also supplied.

Further, the compressed digital video signal DCI or DC supplied to the composite word string data forming section 11 is supplied.
The frequency for P is 74.25 MHz or 14
The word clock signal CX of 8.5 MHz is also supplied to the clock frequency determination unit 12. The clock frequency determination unit 12 detects the frequency of the supplied word clock signal CX, and based on the detected frequency, whether the word clock signal CX is the compressed digital video signal DCI or the compressed digital video signal DCP. Determine if it is a thing.

That is, the detected frequency is 74.25 MH.
If z, the word clock signal CX is that of the compressed digital video signal DCI, and the detected frequency is 1
If it is 48.5 MHz, the word clock signal CX is
It is determined that the compressed digital video signal DCP belongs. Then, the clock frequency determination unit 12
Generate a discrimination output signal SCD according to the discrimination result,
It is supplied to the composite word string data forming unit 11.

As a result of the discrimination in the clock frequency discriminating section 12, when the word clock signal CX is the compressed digital video signal DCI, the discrimination output signal SCD.
Indicates that the compressed digital video signal DCI is being supplied to the composite word string data forming unit 11. When the word clock signal CX is of the compressed digital video signal DCP, the discrimination output signal SCD is the composite word. It shows that the compressed digital video signal DCP is supplied to the column data forming unit 11.

In the composite word string data forming unit 11, the compressed digital video signal DCI or DCP is
It is supplied to the 8B / 10B conversion unit 13. The 8B / 10B converter 13 includes a horizontal synchronization signal SH and a vertical synchronization signal SV.
Is also supplied.

The 8B / 10B converter 13 uses the horizontal synchronizing signal SH and the vertical synchronizing signal SV to generate 8
Compressed digital video signal DCI in which 8 bits each sequentially forming bit words are formed as bit word string data
Or, 8B / 10B conversion is applied to DCP and 1
0-bit word data is sequentially formed, and
Bit word data is formed in a row, and the word transmission rate is 74.25 MBps or 148.5 MBps.
The converted 10-bit word string data DX (10) is obtained. Then, the obtained converted 10-bit word string data D
X (10) is supplied to the speed conversion / synchronization data insertion unit 14.

The speed conversion / synchronization data insertion unit 14 includes a horizontal synchronization signal SH, a vertical synchronization signal SV, and a clock signal C.
A, the word clock signal CX, and the discrimination output signal SCD from the clock frequency discrimination unit 12 are also supplied.

Further, the composite word string data forming unit 11 includes a word data transmitting unit 15 for transmitting the additional word data group DWIP and an additional word data group DWP.
Word data sending unit 16 sending P, word data sending unit 1 sending additional word data group DWIN
7 and a word data transmission unit 18 for transmitting the additional word data group DWPN. Each of the word data transmission units 15, 16, 17 and 18 has a discrimination output signal SC from the clock frequency discrimination unit 12.
D is supplied.

Then, the discrimination output signal SCD is sent to the composite word string data forming section 11 at a word transmission rate of 74.2.
When the compressed digital video signal DCI of 5 MBps is supplied, the word data transmitters 15 and 17 respectively add the additional word data groups DWIP and DWIP.
The state in which WIN is transmitted is taken, and the determination output signal S
When the CD indicates that the compressed digital video signal DCP is supplied to the composite word string data forming unit 11, the word data sending units 16 and 18 are set to send the additional word data groups DWPP and DWPN, respectively.

Additional word data groups DWIP and D
The WIN is composed of a plurality of 10-bit word data each containing 10-bit word synchronization data, and is made up of two 10-bit word string data having different codes and having a word transmission rate of, for example, 50 MBps. It The additional word data groups DWPP and DWPN are each composed of a plurality of 10-bit word data including 10-bit word synchronization data,
Both are set as two 10-bit word string data having different code from each other and having a word transmission rate of, for example, 100 MBps.

Additional word data group DWIP sent from the word data sending section 15 and additional word data group DWI sent from the word data sending section 17
N, or the additional word data group DWPP sent from the word data sending unit 16 and the additional word data group DW sent from the word data sending unit 18.
PN is the data addition unit 19 and the data addition unit 20, respectively.
Is supplied to the speed conversion / synchronization data insertion unit 14 through.

In the speed conversion / synchronization data insertion unit 14, the word transmission rate is 74.25 MBps or 1
The word transmission rate is 74.25 for the converted 10-bit word string data DX (10) that is set to 48.5 MBps.
In case of MBps, the word transmission rate is 50
The speed conversion process for changing to MBps is performed, and when the word transmission rate is set to 148.5 MBps, the speed conversion process for changing the word transmission rate to 100 MBps is performed.

Further, in the speed conversion / synchronization data insertion unit 14, the discrimination output signal SCD from the clock frequency discrimination unit 12 and the compressed digital video signal DCI to the composite word string data formation unit 11 are supplied. , The converted 10-bit word string data DX (10) is speed-converted to a word transmission rate of 50 MBps.
Additional word data including a 10-bit word synchronization data from the word data transmission unit 15 at a word transmission rate of 50 MBps in a portion where there is no compressed data following a portion where there is compressed data in each frame period. The group DWIP or the additional word data group DWIN having the word transmission rate including the 10-bit word synchronization data from the word data sending unit 17 of 50 MBps is inserted. Further, in the speed conversion / synchronization data insertion unit 14, the clock frequency determination unit 1
When the discrimination output signal SCD from 2 indicates that the compressed digital video signal DCP is supplied to the composite word string data forming unit 11, the word transmission rate is 100 MBp.
In the converted 10-bit word string data DX (10) that has been subjected to speed conversion to be s, a portion from the word data sending unit 16 to a portion where there is no compressed data following a portion where there is compressed data in each frame period. Word transmission rate including 10-bit word synchronization data is 100MB
An additional word data group DWPP of ps or the word transmission rate including the 10-bit word synchronization data from the word data sending unit 18 is 100 MBps.
The additional word data group DWPN is inserted.

As a result, in the speed conversion / synchronization data insertion unit 14, as shown in FIG. 2, the composite 10-bit word string data DZ for setting the word transmission rate based on the compressed digital video signal DCI or DCP to 50 MBps or 100 MBps. (10) is formed.

Under such circumstances, the 8B / 10B conversion unit 13
Is the compressed digital video signal DCI or DCP 8
B / 10B conversion processing is applied to increase the word transmission rate to 7
To obtain the converted 10-bit word string data DX (10) of 4.25 MBps or 148.5 MBps, the speed conversion / synchronous data insertion unit 14 of the converted 10-bit word string data DX (10) performs speed conversion. Added word data group DWIP,
RD data DRD that indicates whether the immediately preceding 10-bit word data that is to be located immediately before the portion where DWPP, DWIN, or DWPN is inserted has its RD positive (+) or negative (-). Send it out, R
The D data DRD is supplied to the speed conversion / synchronization data insertion unit 14.

As a result, the speed conversion / synchronization data insertion unit 14 changes the word transmission rate from 74.25 MBps to 5
Add additional word data group DWIP or DWIN to the converted 10-bit word string data DX (10) converted to 0 MBps, or add to the converted 10-bit word string data DX (10) converted from 148.5 MBps to 100 MBps. Word data group DWP
When inserting P or DWPN, RD data D
RD is the last 10-bit word data and RD is negative (-)
In this case, the additional word data group DWIP is inserted into the converted 10-bit word string data DX (10) whose word transmission rate has been converted from 74.25 MBps to 50 MBps, or the word transmission rate. From 148.5 MBps to 100
Converted 10-bit word string data D converted to MBps
The additional word data group DWPP is inserted into X (10), and the RD data DRD is set to 1 immediately before.
When the 0-bit word data indicates that RD is positive (+), the word transmission rate is 74.25.
A state in which an additional word data group DWIN is inserted in the converted 10-bit word string data DX (10) converted from MBps to 50 MBps, or a converted 10-bit word string data converted from a word transmission rate of 148.5 MBps to 100 MBps The additional word data group DWPN is inserted into DX (10).

FIG. 3 shows the speed conversion / synchronization data insertion unit 14.
A specific configuration example of the above is shown. In the example shown in FIG. 3, the compressed digital video signal D supplied from the 8B / 10B conversion unit 13 to the composite word string data formation unit 11
The word transmission rate obtained based on CI or DCP is 74.25 MBps or 148.5 MBps
The converted 10-bit word string data DX (10) is
It is supplied to the switch 21. The control signal CSA from the switch control signal forming unit 22 is also supplied to the switch 21.

The switch control signal forming section 22 is supplied with the horizontal synchronizing signal SH, the vertical synchronizing signal SV, and the RD data DRD from the 8B / 10B converting section 13. The switch control signal forming unit 22 outputs the control signal CSA for each frame period in the compressed digital video signal DCI or DCP supplied to the composite word string data forming unit 11 according to the horizontal synchronizing signal SH and the vertical synchronizing signal SV. Therefore, the converted 10-bit word string data DX (10) is formed in synchronization with each frame period. Further, the switch control signal forming unit 22 determines that the RD data DR
The control signal CSD corresponding to the contents of D is formed. The control signal CSD takes a high level, for example, when the RD data DRD indicates that the immediately preceding 10-bit word data makes RD negative (-), and the RD data DRD has the immediately preceding 10-bit word data having a positive RD. A low level is used to indicate that it is (+).

A memory section 23 and a memory section 24 are connected to the switch 21. Then, the switch 21 switches at the beginning of each frame period in the compressed digital video signal DCI or DCP according to the control signal CSA synchronized with each frame period in the converted 10-bit word string data DX (10). I do. As a result, the converted 10-bit word string data DX (10) becomes 1
The converted 10-bit word string data DX (1 is supplied alternately to the memory unit 23 and the memory unit 24 for each frame period.
Regarding 0), the state in which the distributed supply to the memory unit 23 and the memory unit 24 is performed is taken.

Further, regarding the memory units 23 and 24,
The memory control signal forming unit 25 is provided, and the memory control signal forming unit 25 is supplied with the word clock signal CX, the clock signal CA, and the discrimination output signal SCD from the clock frequency discrimination unit 12. Then, the memory control signal forming unit 25 sets the frequency to 74.25 MHz or 148.5 M based on the word clock signal CX having the frequency of 74.25 MHz or 148.5 MHz.
A write control signal QW having a frequency of Hz is generated, and a read control signal QR having a frequency of 50 MHz or 100 MHz is generated based on the clock signal CA and the determination output signal SCD. In such a case, the memory control signal forming unit 2
When the discrimination output signal SCD indicates that the compressed digital video signal DCI having the word transmission rate of 74.25 MBps is supplied to the composite word string data forming unit 11, the frequency 5 is based on the clock signal CA. Fifty
When the read control signal QR of MHz is generated and the discrimination output signal SCD indicates that the compressed digital video signal DCP having the word transmission rate of 148.5 MBps is supplied to the composite word string data forming unit 11. Is
A read control signal QR having a frequency of 100 MHz is generated based on the clock signal CA.

That is, from the memory control signal forming section 25,
The word transmission rate is set to 7 in the composite word string data forming unit 11.
Compressed digital video signal DCI with 4.25 MBps
Is supplied, a write control signal QW having a frequency of 74.25 MHz and a read control signal QR having a frequency of 50 MHz are obtained, and the composite word string data forming unit 1
1 is supplied with a compressed digital video signal DCP having a word transmission rate of 148.5 MBps, a write control signal QW having a frequency of 148.5 MHz and a frequency of 1
A read control signal QR having a frequency of 00 MHz is obtained. Then, the memory control signal forming section 25 supplies the write control signal QW and the read control signal QR to both the memory sections 23 and 24.

As a result, in the memory section 23, when the compressed digital video signal DCI is supplied to the composite word string data forming section 11, the converted 10-bit word string for setting the word transmission rate to 74.25 MBps through the switch 21. In the period in which the data DX (10) is supplied, the word transmission rate is changed by one frame period of the converted 10-bit word string data DX (10) according to the write control signal QW having a frequency of 74.25 MHz. 74.
It is written in the state of 25 MBps. Further, even in the memory unit 24, when the compressed digital video signal DCI is supplied to the composite word string data forming unit 11, the word transmission rate is set to 74.25 MBps through the switch 21.
In the period in which the converted 10-bit word string data DX (10) is supplied, the frequency of one frame period of the converted 10-bit word string data DX (10) is 7
Writing is performed in a state in which the word transmission rate is 74.25 MBps in accordance with the write control signal QW of 4.25 MHz.

Therefore, when the compressed digital video signal DCI is supplied to the composite word string data forming section 11,
Writing the converted 10-bit word string data DX (10) in the memory units 23 and 24 in a state where the word transmission rate for one frame period is 74.25 MBps corresponds to each of the converted 10-bit word string data DX (10). The switch 21 is performed at each time point at the beginning of the frame period.
Alternately according to the switching of.

Further, in the memory section 23, the compressed digital video signal DC is added to the composite word string data forming section 11.
When P is supplied, one frame of the converted 10-bit word string data DX (10) is supplied during the period in which the converted 10-bit word string data DX (10) having a word transmission rate of 148.5 MBps is supplied through the switch 21. The word transmission rate is 148.5M according to the write control signal QW whose frequency is 148.5 MHz.
It is written in the state of Bps. In addition, the memory unit 24
If the compressed digital video signal DCP is supplied to the composite word string data forming unit 11, the switch 21
During the period in which the converted 10-bit word string data DX (10) that sets the word transmission rate to 148.5 MBps is supplied through the converted 10-bit word string data D.
One frame period of X (10) has a frequency of 148.5.
Writing is performed in a state where the word transmission rate is 148.5 MBps according to the write control signal QW which is set to MHz.

Therefore, when the compressed digital video signal DCP is supplied to the composite word string data forming section 11,
Writing the converted 10-bit word string data DX (10) in the memory units 23 and 24 with the word transmission rate for one frame period of 148.5 MBps is performed for each of the converted 10-bit word string data DX (10). The switch 21 is performed at each time point at the beginning of the frame period.
Alternately according to the switching of.

When the converted 10-bit word string data DX (10) for one frame period is written in each of the memory units 23 and 24 for the word transmission rate of 74.25 MBps, the memory unit 23 is written. One frame period of the written converted 10-bit word string data DX (10) has a frequency within a period corresponding to one frame period of the converted 10-bit word string data DX (10) following the writing period. According to the read control signal QR of 50 MHz, 10 bits are read from the memory unit 23 by 10 bits to sequentially form 10-bit words, and the converted 10-bit word string data DX written in the memory unit 24 is written. The converted 10-bit word string data DX following the write period for one frame period of (10)
In the period corresponding to one frame period of (10),
Depending on the read control signal QR whose frequency is 50 MHz,
It is assumed that 10 bits are read from the memory unit 24 by 10 bits to sequentially form 10-bit words. Thereby,
The word transmission rate is set to 5 from each of the memory units 23 and 24.
10-bit word string data DXZ 'with 0 MBps
(10) is obtained and is supplied to the switch 26.

Similarly, when writing the converted 10-bit word string data DX (10) for one frame period in which the word transmission rate is 148.5 MBps in each of the memory units 23 and 24, Converted 10-bit word string data DX (10) written in 23
1 frame period of the conversion 10 that follows the writing period.
In the period corresponding to one frame period of the bit word string data DX (10), 10 bits are read from the memory unit 23 in units of 10 bits in accordance with the read control signal QR having a frequency of 100 MHz, and a 10-bit word is read. The conversions 1 that are sequentially formed and are written in the memory unit 24
For one frame period of the 0-bit word string data DX (10), reading with the frequency set to 100 MHz in a period corresponding to one frame period of the converted 10-bit word string data DX (10) following the writing period. Control signal QR
In accordance with the above, 10 bits are read from the memory unit 24 by 10 bits to sequentially form 10-bit words. As a result, 10-bit word string data DXZ ′ (10) having a word transmission rate of 100 MBps is obtained from each of the memory units 23 and 24, and is supplied to the switch 26.

In the switch 26, the converted 10-bit word string data DX (1
0) control signal CS synchronized with each frame period
A is also supplied. Then, the switch 26 controls the control signal C.
In accordance with SA, 10-bit word string data DXZ ′ (10) read from the memory unit 23 and 10-bit word string data DXZ ′ (1 read from the memory unit 24.
0) are alternately taken out to form 10-bit word string data DXZ (10) having a word transmission rate of 50 MBps or 100 MBps.

The 10-bit word string data DXZ (10) thus formed by the switch 26 is subjected to 8B / 10B conversion on the compressed digital video signal DCI or DCP supplied to the composite word string data forming section 11. And the word transmission rate is 74.25M
From Bps to 50MBps or 148.5MB
It is a compressed digital video signal obtained by performing a transmission rate conversion for converting from ps to 100 MBps. And
10-bit word string data D obtained from the switch 26
XZ (10) is supplied to the switch 27 and
SHC; supplied to the SEC detection unit 28.

SHC: 1 in the SEC detector 28
S as shown in B of FIG. 19 which is included in the compressed data in each frame period of the 0-bit word string data DXZ (10) and is converted into 10-bit word data.
HC and SEC are detected, and S corresponding to the detected SHC is detected.
S corresponding to the HC detection output signal SSH and the detected SEC
The EC detection output signal SSE is transmitted.

SHC: The SHC detection output signal SSH and the SEC detection output signal SSE from the SEC detection section 25 are supplied to the control signal forming section 29. Control signal forming unit 29
Is a control signal CSB corresponding to the SHC detection output signal SSH.
And a control signal CSC corresponding to the SEC detection output signal SSE, and supply them to the switch 27. The control signal CSB is supplied to the switch 2 in synchronization with the SHC located at the beginning of the compressed data in each frame period of the 10-bit word string data DXZ (10) obtained from the switch 26.
7 and the control signal CSC is supplied to the switch 26.
10-bit word string data DXZ (10) obtained from
Is supplied to the switch 27 in synchronization with the SEC located at the end of the compressed data in each frame period.

A switch 30 is provided in association with the switch 27. The switch 30 includes an additional word data group DWIP including the 10-bit synchronous word data from the word data transmitting unit 15 or an additional word data group DWPP including the 10-bit synchronous word data from the word data transmitting unit 16 and the word data. The additional word data group DWIN including the 10-bit synchronous word data from the sending unit 17 or the additional word data group DWPN including the 10-bit synchronous word data from the word data sending unit 18 is supplied, and further the switch control signal formation Control signal CSD from unit 22
Is also supplied.

Then, the switch 30 controls the control signal CSD.
Takes a high level, that is, the 8B / 10B converter 13
When the RD data DRD sent from the word data 10 indicates that the immediately preceding 10-bit word data makes RD negative (-), the additional word data group DWIP from the word data sending unit 15 or the word data sending unit 1
6. Take the additional word data group DWPP from 6 and feed it to the switch 26,
When D takes a low level, that is, 8B / 10B converter 1
3 indicates that the immediately preceding 10-bit word data makes the RD positive (+), the additional word data group DWIN from the word data sending unit 17 or the word data sending unit 18 Takes out the additional word data group DWPN from and supplies it to the switch 27.

The switch 27 is operated from the switch 26 from the time when the supply of the control signal CSB from the control signal forming unit 29 is started to the time when the supply of the control signal CSC from the control signal forming unit 29 is finished thereafter. The 10-bit word string data DXZ (10) is taken out, and subsequently, from the time when the supply of the control signal CSC from the control signal forming unit 29 is completed, the control signal C from the control signal forming unit 29 is subsequently obtained.
By the time the supply of SB is started, the switch 30
Additional word data group from DWIP or DW
The operation of extracting PP or the additional word data group DWIN or DWPN is repeated. As a result, the switch 27 extracts the portion of the 10-bit word string data DXZ (10) from the switch where the compressed data is present during each frame period, and the portion where the compressed data is present is followed by the switch. Additional word data group DWIP or DWPP from 30 or additional word data group D
The state in which WIN or DWPN is taken out is repeated.

As a result, from the switch 27, the additional word data group D is added to the portion of the 10-bit word string data DXZ (10) in which the compressed data exists in each frame period and the compressed data does not exist.
WIP or DWPP, or the additional word data group DWIN or DWPN is formed by the process of inserting, and as shown in FIG. 2, each frame period is compressed data followed by the additional word data group DWIP or DWPP or additional word data group DWIN or DWPN with a word transmission rate of 50 MBps or 100
Composite 10-bit word string data DZ (1
0) is obtained.

In this case, the additional word data group DWIP or DWPP from the switch 30 or the additional word data group DWIN or DWPN is inserted into the 10-bit word string data DXZ (10) obtained from the switch 26. SEC and SHC included in the compressed data in each frame period of the 10-bit word string data DXZ (10) are detected by detecting the part in which the compressed data exists in each frame period. And are detected.

Then, the speed conversion / synchronization data insertion unit 14
The composite 10-bit word string data DZ (10) having a word transmission rate of 50 MBps or 100 MBps obtained by is sent from the composite word string data forming unit 11 and supplied to the P / S conversion unit 31. The word transmission rates of 50 MBps and 100 MBps are transmission rates selected as suitable for transmission of the compressed digital video signals DCI and DCP, respectively.

Each of the additional word data group DWIP having a word transmission rate of 50 MBps from the word data transmitting unit 15 and the additional word data group DWPP having a word transmission rate of 100 MBps from the word data transmitting unit 16 has 10 bits. Although it is configured as 10-bit word string data including word synchronization data, in one example, from the start end to the end, D2
Auxiliary 10-bit word data referred to by a code name of 1.5, auxiliary 10-bit word data referred to by a code name of D21.3, and + K28.5, which is 10-bit word synchronization data, are sequentially connected, and further + K2.
Any auxiliary 10-bit word data DXX
Auxiliary 10-bit word data, which is referred to by a code name of X, ..., + K28.5, D21.4, is sequentially connected.

Further, each of the additional word data group DWIN having a word transmission rate of 50 MBps from the word data transmitting section 17 and the additional word data group DWPN having a word transmission rate of 100 MBps from the word data transmitting section 18 Although it is configured as 10-bit word string data including 10-bit word synchronization data, in one example, from the start end to the end,
D21.4, D21.3, and + K28.5 are successively connected,
Further, any auxiliary 10-bit word data DXX · X, ..., + K28.5, D21.
3 are sequentially connected.

As shown in FIG. 4, D21.3 is "101" in which RD is neutral when CRD, which is the RD of the word data arranged immediately before it, is negative (-).
010100 ", and when the CRD, which is the RD based on the word data placed immediately before it, is positive (+), RD
"1010001111" which is neutral. D21.4 is RD when CRD, which is the RD based on the word data arranged immediately before it, is negative (-).
Is set to "1010101101", which is positive (+), and the CRD that is the RD of the word data arranged immediately before that.
Is positive (+), RD is negative (-) "1010
10002 ". Further, D21.5 is" 101 "which makes RD neutral when CRD which is the RD by the word data arranged immediately before it is negative (-).
When the CRD, which is the RD based on the word data immediately before that, is positive (+),
"1010101010" that is neutral.

The above-mentioned additional word data group DWIP
Alternatively, a composite 1 formed by inserting an example of DWPP
In the 0-bit word string data DZ (10), a portion in which the additional word data group DWIP or DWPP is inserted includes + K28.5 which is 10-bit word synchronization data as shown in A of FIG. . In FIG. 5A, the DV 10 is the memory unit 23 shown in FIG.
10 and 24 respectively represent 10-bit word data forming 10-bit word string data DXZ ′ (10), and −DV10 particularly represents DV10 in which RD is negative (−).

Further, the above-mentioned additional word data group D
In the composite 10-bit word string data DZ (10) formed by inserting an example of WIN or DWPN, the portion in which the additional word data group DWIN or DWPN is inserted is a 10-bit word as shown in FIG. 5B. It is assumed to include + K28.5 which is synchronous data.
Also in FIG. 5B, the DV 10 represents each 10-bit word data forming the 10-bit word string data DXZ ′ (10) obtained from each of the memory units 23 and 24 shown in FIG. 3, and in particular, + DV10 is RD
Represents DV10 in which is positive (+).

The composite 10-bit word string data DZ
(10) is the additional word data group DWIP or DWPP or the additional word data group DW
When the portion into which IN or DWPN is inserted is as shown in A of FIG. 5 or B of FIG. 5, additional word data group DWIP or DWIP
PP or the additional word data group DWIN or DWPN is the composite 10-bit word string data DZ.
In the part where the additional word data group DWIP or DWPP in (10) or the additional word data group DWIN or DWPN is inserted,
It is selected to include 10-bit word synchronization data with RD positive (+), that is, + K28.5. However, depending on the case, the composite 10-bit word string data DZ (10) may have a portion in which the additional word data group DWIP or DWPP or the additional word data group DWIN or DWPN is inserted as shown in FIG. The additional word data group DWIP or DWPP or the additional word data group DWIN or DWPN is added to the composite 10-bit word string data DZ (10) under the same condition as shown in B. Word data group DWIP or DWPP, or additional word data group DWIN or DW
In the portion where PN is inserted, it may be selected as 10-bit word synchronization data with RD being negative (-), that is, -K28.5.

Under the above-mentioned conditions, the composite 10-bit word string data DZ from the composite word string data forming unit 11 is obtained.
The P / S conversion unit 31 to which (10) is supplied performs P / S conversion on the composite 10-bit word string data DZ (10) to generate a bit based on the composite 10-bit word string data DZ (10). The transmission rate is 50 MBps × 10 = 0.
5 Gbps or 100 MBps × 10 = 1 Gbps
To form serial data DZS and supply the serial data DZS to the transmitter 32. The transmitter 32 transmits the serial data DZS through, for example, a data transmission line formed by using a coaxial cable or an optical fiber, and an electric signal suitable for the data transmission line formed by using the coaxial cable. Alternatively, it is transmitted as a transmission signal SZ which is an optical signal or the like suitable for a data transmission path formed by using an optical fiber. Thereby, the serial data DZS is transmitted.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S conversion unit 31 and the transmission unit 32 have a word transmission rate of 50 MBps or 100 MBps.
Composite 10-bit word string data DZ (10)
Bit transmission rate of 0.5 Gbps or 1 Gbps
Since it is converted into the serial data DZS and transmitted, the P / S converter 31 and the transmitter 32 are
Can be configured, for example, by effectively utilizing an integrated circuit element or the like provided for transmitting a digital video signal under a fiber channel system.
Therefore, the 8B / 10B conversion and the addition of the word synchronization data are performed on the data to be transmitted, and the 8B / 10B conversion based on the data to be transmitted and the word string data including the word synchronization data are performed. When transmitting the compressed digital video signal by the transmission method in which the word string data is formed and converted into serial data and transmitted, for example, either the compressed digital video signal DCI or DCP is to be transmitted. Even in this case, the data forming the compressed digital video signal to be transmitted can be accurately discriminated, and it can be compared properly and at an appropriate transmission speed with good transmission quality. It can be transmitted using a means that can be easily arranged.

FIG. 6 shows an example of the data transmission method according to the invention described in any one of claims 1 to 3 and claims 5 to 14 in the claims of the present application. Claim 1 in the claims of the present application
5, an example of a data transmission device according to the invention described in claim 17 or claim 18 is shown.

In the example shown in FIG. 6, the compressed digital video signal DCI or the compressed digital video signal D
The CP is supplied to the composite word string data forming unit 41 as a compressed digital video signal to be transmitted.

Compressed digital video signal DCI or D
CP is a compressed digital video signal DCI supplied to the composite word string data forming unit 11 in the example shown in FIG.
Alternatively, it is similar to DCP. In the compressed digital video signal DCI, each set of a portion where compressed data exists and a portion where compressed data does not form one frame period. The compressed digital video signal DCI is 8-bit word string data having a word transmission rate of, for example, 74.25 MBps. Therefore, the clock frequency of the compressed digital video signal DCI is, for example, 74.25.
It is 25 MHz. In addition, the compressed digital video signal DC
P is a word transmission rate, for example, 148.5 MBp
It is 8-bit word string data to be s, and therefore the clock frequency of the compressed digital video signal DCP is, for example, 148.5 MHz.

The composite word string data forming section 41 is provided with a compressed digital video signal DCI or D supplied thereto.
The horizontal synchronizing signal SH and the vertical synchronizing signal SV respectively synchronized with the CP line period and field period or frame period, and the frequency of the compressed digital video signal DCI or DCP supplied thereto are set to 74.25M.
A word clock signal CX having a frequency of Hz or 148.5 MHz is supplied, and a clock signal CA having a frequency of 50 MHz is also supplied.

Further, the compressed digital video signal DCI or DC supplied to the composite word string data forming section 41 is supplied.
The frequency for P is 74.25 MHz or 14
The word clock signal CX of 8.5 MHz is also supplied to the clock frequency determination unit 42. The clock frequency determination unit 42 detects the frequency of the supplied word clock signal CX, and based on the detected frequency, the word clock signal CX is the compressed digital video signal DCI or the compressed digital video signal DCP. Determine if it is a thing.

That is, the detected frequency is 74.25 MH.
If z, the word clock signal CX is that of the compressed digital video signal DCI, and the detected frequency is 1
If it is 48.5 MHz, the word clock signal CX is
It is determined that the compressed digital video signal DCP belongs. Then, the clock frequency discrimination unit 42
Generate a discrimination output signal SCD according to the discrimination result,
It is supplied to the composite word string data forming unit 41.

As a result of the discrimination by the clock frequency discriminating section 42, when the word clock signal CX is the compressed digital video signal DCI, the discrimination output signal SCD
Indicates that the compressed digital video signal DCI is supplied to the composite word string data forming unit 41. When the word clock signal CX is of the compressed digital video signal DCP, the determination output signal SCD indicates the composite word. It shows that the compressed digital video signal DCP is supplied to the column data forming unit 41.

In the composite word string data forming section 41, the compressed digital video signal DCI or DCP is
It is supplied to the 8B / 10B conversion unit 43. The 8B / 10B converter 43 includes a horizontal synchronization signal SH and a vertical synchronization signal SV.
Is also supplied.

In the 8B / 10B conversion unit 43, the 8B / 10B conversion unit 43 uses the horizontal synchronizing signal SH and the vertical synchronizing signal SV to
Compressed digital video signal DCI in which 8 bits each sequentially forming bit words are formed as bit word string data
Alternatively, 8B / 10B conversion is performed on the DCP, and the word transmission rate is 74.25 MBps or 148.
Convert 10-bit word string data DX to 5 MBps
(10) is obtained. Then, the obtained converted 10-bit word string data DX (10) is supplied to the speed conversion / synchronization data insertion unit 44.

The speed conversion / synchronization data insertion section 44 includes a horizontal synchronization signal SH, a vertical synchronization signal SV, and a clock signal C.
A, the word clock signal CX, and the discrimination output signal SCD from the clock frequency discrimination unit 42 are also supplied.

Further, the composite word string data forming section 41 has a word data transmitting section 45 for transmitting the additional word data group DWI and an additional word data group DWP.
Is provided for transmitting word data.
Each of these word data transmitters 45 and 46 is
The discrimination output signal SCD from the clock frequency discrimination unit 42 is supplied.

Then, the discrimination output signal SCD causes the composite word string data forming section 41 to have a word transmission rate of 74.2.
When the compressed digital video signal DCI of 5 MBps is supplied, the word data transmission unit 45 is set to the state of transmitting the additional word data group DWI, and the determination output signal SCD indicates that the composite word string data is formed. When it is indicated that the compressed digital video signal DCP is being supplied to the section 41, the word data sending section 46 is set to send the additional word data group DWP.

The additional word data group DWI is 10
It is composed of a plurality of 10-bit word data including bit-word synchronization data, and is a 10-bit word string data having a word transmission rate of, for example, 50 MBps. Further, the additional word data group DWP is 10
It is composed of a plurality of 10-bit word data including bit-word synchronization data, and is 10-bit word string data having a word transmission rate of 100 MBps, for example.

The additional word data group DWI sent from the word data sending unit 45 or the additional word data group DWP sent from the word data sending unit 46 is sent through the data adding unit 47 to the speed conversion / synchronous data inserting unit 44. Is supplied to.

In the speed conversion / synchronization data insertion unit 44, the word transmission rate is set to 74.25 MBps or 1
The word transmission rate is 74.25 for the converted 10-bit word string data DX (10) that is set to 48.5 MBps.
In case of MBps, the word transmission rate is 50
The speed conversion process for changing to MBps is performed, and when the word transmission rate is set to 148.5 MBps, the speed conversion process for changing the word transmission rate to 100 MBps is performed.

Further, in the speed conversion / synchronization data insertion unit 44, the discrimination output signal SCD from the clock frequency discrimination unit 42 and the compressed digital video signal DCI to the composite word string data formation unit 41 are supplied. , The converted 10-bit word string data DX (10) is speed-converted to a word transmission rate of 50 MBps.
Additional word data in which the word transmission rate including the 10-bit word synchronization data from the word data sending unit 45 is 50 MBps in the portion where there is no compressed data following the portion where the compressed data exists in each frame period in Insert group DWI. Furthermore, speed conversion
In the synchronous data insertion section 44, when the discrimination output signal SCD from the clock frequency discrimination section 42 indicates that the compressed digital video signal DCP is supplied to the composite word string data forming section 41, the word transmission rate is set. 100M
In the converted 10-bit word string data DX (10) that has been subjected to speed conversion to be Bps, a portion from the word data sending unit 46 to a portion where there is no compressed data following a portion where compressed data exists during each frame period. Word transmission rate including 10-bit word synchronization data is 100
An additional word data group DWP having MBps is inserted.

As a result, in the speed conversion / synchronization data insertion unit 44, as shown in FIG. 7, the composite 10-bit word string data DZ for setting the word transmission rate based on the compressed digital video signal DCI or DCP to 50 MBps or 100 MBps. (10) is formed.

FIG. 8 shows the speed conversion / synchronization data insertion unit 44.
A specific configuration example of the above is shown. In the example shown in FIG. 8, the compressed digital video signal D supplied from the 8B / 10B converting section 43 to the composite word string data forming section 41.
The word transmission rate obtained based on CI or DCP is 74.25 MBps or 148.5 MBps
The converted 10-bit word string data DX (10) is
It is supplied to the switch 51. The control signal CSA from the switch control signal forming unit 52 is also supplied to the switch 51.

The switch control signal forming section 52 is supplied with the horizontal synchronizing signal SH and the vertical synchronizing signal SV. The switch control signal forming unit 52 outputs the control signal CSA for each frame period in the compressed digital video signal DCI or DCP supplied to the composite word string data forming unit 41 according to the horizontal synchronizing signal SH and the vertical synchronizing signal SV. Therefore, the converted 10-bit word string data DX (10) is formed in synchronization with each frame period.

A memory section 53 and a memory section 54 are connected to the switch 51. Then, the switch 51 switches at the beginning of each frame period in the compressed digital video signal DCI or DCP in accordance with the control signal CSA synchronized with each frame period in the converted 10-bit word string data DX (10). I do. As a result, the converted 10-bit word string data DX (10) becomes 1
The converted 10-bit word string data DX (1 is supplied alternately to the memory unit 53 and the memory unit 54 for each frame period.
Regarding 0), the state in which the distributed supply to the memory unit 53 and the memory unit 54 is performed is taken.

Further, regarding the memory units 53 and 54,
The memory control signal forming unit 55 is provided, and the memory control signal forming unit 55 is supplied with the word clock signal CX, the clock signal CA, and the discrimination output signal SCD from the clock frequency discrimination unit 42. Then, the memory control signal forming unit 55 sets the frequency to 74.25 MHz or 148.5 M based on the word clock signal CX having the frequency of 74.25 MHz or 148.5 MHz.
A write control signal QW having a frequency of Hz is generated, and a read control signal QR having a frequency of 50 MHz or 100 MHz is generated based on the clock signal CA and the determination output signal SCD. At this time, the memory control signal forming unit 5
When the discrimination output signal SCD indicates that the compressed digital video signal DCI having the word transmission rate of 74.25 MBps is supplied to the composite word string data forming unit 41, the frequency 5 is based on the clock signal CA. Fifty
In the case where the read control signal QR of MHz is generated and the discrimination output signal SCD indicates that the compressed digital video signal DCP having the word transmission rate of 148.5 MBps is supplied to the composite word string data forming section 41. Is
A read control signal QR having a frequency of 100 MHz is generated based on the clock signal CA.

That is, from the memory control signal forming section 55,
The word transmission rate is set to 7 in the composite word string data forming unit 41.
Compressed digital video signal DCI with 4.25 MBps
Is supplied, a write control signal QW having a frequency of 74.25 MHz and a read control signal QR having a frequency of 50 MHz are obtained, and the composite word string data forming unit 4
1 is supplied with a compressed digital video signal DCP having a word transmission rate of 148.5 MBps, a write control signal QW having a frequency of 148.5 MHz and a frequency of 1
A read control signal QR having a frequency of 00 MHz is obtained. Then, the memory control signal forming section 55 supplies the write control signal QW and the read control signal QR to both the memory sections 53 and 54.

As a result, in the memory section 53, when the compressed digital video signal DCI is supplied to the composite word string data forming section 41, the conversion 10-bit word string which makes the word transmission rate 74.25 MBps through the switch 51. In the period in which the data DX (10) is supplied, the word transmission rate is changed by one frame period of the converted 10-bit word string data DX (10) according to the write control signal QW having a frequency of 74.25 MHz. 74.
It is written in the state of 25 MBps. Further, even in the memory unit 54, when the compressed digital video signal DCI is supplied to the composite word string data forming unit 41, the word transmission rate is set to 74.25 MBps through the switch 51.
In the period in which the converted 10-bit word string data DX (10) is supplied, the frequency of one frame period of the converted 10-bit word string data DX (10) is 7
Writing is performed in a state in which the word transmission rate is 74.25 MBps in accordance with the write control signal QW of 4.25 MHz.

Therefore, when the compressed digital video signal DCI is supplied to the composite word string data forming section 41,
Writing the converted 10-bit word string data DX (10) in the memory units 53 and 54 in a state where the word transmission rate for one frame period is 74.25 MBps is the conversion 10-bit word string data DX (10). The switch 51 is performed at each of the beginning points of the frame period.
Alternately according to the switching of.

Further, in the memory section 53, the compressed digital video signal DC is added to the composite word string data forming section 41.
When P is supplied, one frame of the converted 10-bit word string data DX (10) is supplied during the period in which the converted 10-bit word string data DX (10) having a word transmission rate of 148.5 MBps is supplied through the switch 51. The word transmission rate is 148.5M according to the write control signal QW whose frequency is 148.5 MHz.
It is written in the state of Bps. In addition, the memory unit 54
If the compressed digital video signal DCP is supplied to the composite word string data forming unit 41, the switch 51
During the period in which the converted 10-bit word string data DX (10) that sets the word transmission rate to 148.5 MBps is supplied through the converted 10-bit word string data D.
One frame period of X (10) has a frequency of 148.5.
Writing is performed in a state where the word transmission rate is 148.5 MBps according to the write control signal QW which is set to MHz.

Therefore, when the compressed digital video signal DCP is supplied to the composite word string data forming section 41,
Writing the converted 10-bit word string data DX (10) in the memory units 53 and 54 with the word transmission rate for one frame period of 148.5 MBps is performed for each of the converted 10-bit word string data DX (10). The switch 51 is performed at each of the beginning points of the frame period.
Alternately according to the switching of.

When writing the converted 10-bit word string data DX (10) for one frame period into the memory units 53 and 54, respectively, the word transmission rate is set to 74.25 MBps, the memory unit 53 is written. One frame period of the written converted 10-bit word string data DX (10) has a frequency within a period corresponding to one frame period of the converted 10-bit word string data DX (10) following the writing period. According to the read control signal QR of 50 MHz, 10 bits are read from the memory unit 53 by 10 bits to sequentially form a 10-bit word, and the converted 10-bit word string data DX written in the memory unit 54 is written. The converted 10-bit word string data DX following the write period for one frame period of (10)
In the period corresponding to one frame period of (10),
Depending on the read control signal QR whose frequency is 50 MHz,
It is assumed that 10-bit words are sequentially read from the memory section 54 to form 10-bit words. Thereby,
The word transmission rate is set to 5 from each of the memory units 53 and 54.
10-bit word string data DXZ 'with 0 MBps
(10) is obtained and is supplied to the switch 56.

Similarly, when the converted 10-bit word string data DX (10) for one frame period is written in each of the memory units 53 and 54 for the word transmission rate of 148.5 MBps, the memory units are Converted 10-bit word string data DX (10) written in 53
1 frame period of the conversion 10 that follows the writing period.
In the period corresponding to one frame period of the bit word string data DX (10), 10 bits are read from the memory unit 53 by 10 bits in accordance with the read control signal QR having a frequency of 100 MHz, and a 10 bit word is read. The conversion 1 that is sequentially formed and is written in the memory unit 54.
For one frame period of the 0-bit word string data DX (10), reading with the frequency set to 100 MHz in a period corresponding to one frame period of the converted 10-bit word string data DX (10) following the writing period. Control signal QR
According to the above, 10 bits are read from the memory unit 54 by 10 bits to sequentially form 10-bit words. As a result, 10-bit word string data DXZ ′ (10) having a word transmission rate of 100 MBps is obtained from each of the memory units 53 and 54, and is supplied to the switch 56.

The switch 56 has the converted 10-bit word string data DX (1
0) control signal CS synchronized with each frame period
A is also supplied. Then, the switch 56 controls the control signal C.
In accordance with SA, 10-bit word string data DXZ ′ (10) read from the memory unit 53 and 10-bit word string data DXZ ′ (1 read from the memory unit 54.
0) are alternately taken out to form 10-bit word string data DXZ (10) having a word transmission rate of 50 MBps or 100 MBps.

The 10-bit word string data DXZ (10) thus formed by the switch 56 is subjected to 8B / 10B conversion on the compressed digital video signal DCI or DCP supplied to the composite word string data forming section 41. And the word transmission rate is 74.25M
From Bps to 50MBps or 148.5MB
It is a compressed digital video signal obtained by performing a transmission rate conversion for converting from ps to 100 MBps. And
10-bit word string data D obtained from the switch 56
XZ (10) is supplied to the switch 57, and
The SHC is supplied to the SEC detection unit 58.

SHC: 1 in the SEC detector 58
S as shown in B of FIG. 19 which is included in the compressed data in each frame period of the 0-bit word string data DXZ (10) and is converted into 10-bit word data.
HC and SEC are detected, and S corresponding to the detected SHC is detected.
S corresponding to the HC detection output signal SSH and the detected SEC
The EC detection output signal SSE is transmitted.

SHC: The SHC detection output signal SSH and the SEC detection output signal SSE from the SEC detection unit 58 are supplied to the control signal formation unit 59. Control signal forming unit 59
Is a control signal CSB corresponding to the SHC detection output signal SSH.
And a control signal CSC corresponding to the SEC detection output signal SSE, and supply them to the switch 57. The control signal CSB is supplied to the switch 5 in synchronization with the SHC located at the beginning of the compressed data in each frame period of the 10-bit word string data DXZ (10) obtained from the switch 56.
7 and the control signal CSC is supplied to the switch 56.
10-bit word string data DXZ (10) obtained from
The data is supplied to the switch 57 in synchronization with the SEC located at the end of the compressed data in each frame period.

The switch 57 includes a word data transmission unit 4
The additional word data group DWI including the 10-bit synchronous word data from 5 or the additional word data group DWP including the 10-bit synchronous word data from the word data sending unit 46 is also supplied.

The switch 57 operates from the switch 56 from the time when the supply of the control signal CSB from the control signal forming section 59 is started to the end of the supply of the control signal CSC from the control signal forming section 59. The 10-bit word string data DXZ (10) is taken out, and subsequently, from the time when the supply of the control signal CSC from the control signal forming unit 59 is completed, the control signal C from the control signal forming unit 59 is then obtained.
Until the supply of SB is started, the operation of extracting the additional word data group DWI from the word data transmitting unit 45 or the additional word data group DWP from the word data transmitting unit 46 is repeated. Thereby,
The switch 57 takes out the portion of the 10-bit word string data DXZ (10) from the switch 56 in which the compressed data exists in each frame period, and the word data sending unit follows the portion in which the compressed data exists. Additional word data group DWI from 45
Alternatively, the state in which the additional word data group DWP is taken out from the word data sending unit 46 is repeated.

As a result, from the switch 57, the additional word data group D is added to the portion of the 10-bit word string data DXZ (10) where there is compressed data in each frame period and there is no compressed data.
A word transmission rate, which is formed by performing a process of inserting a WI or DWP, as shown in FIG. 7, in which each frame period is composed of compressed data and a subsequent additional word data group DWI or DWP. 50
Composite 10-bit word string data DZ (10) of MBps or 100 MBps is obtained.

In this case, for the 10-bit word string data DXZ (10) obtained from the switch 56, the additional word data group DWI from the word data sending unit 45 or the additional word data group DWP from the word data sending unit 46. Is detected, the detection of the portion where there is no compressed data following the portion where there is compressed data during each frame period is included in the compressed data during each frame period of the 10-bit word string data DXZ (10). This is performed by detecting the SEC and SHC that are detected.

Then, the speed conversion / synchronization data insertion unit 44
The composite 10-bit word string data DZ (10) having a word transmission rate of 50 MBps or 100 MBps obtained by is sent from the compound word string data forming unit 41 and supplied to the P / S conversion unit 61. The word transmission rates of 50 MBps and 100 MBps are transmission rates selected as suitable for transmission of the compressed digital video signals DCI and DCP, respectively.

Each of the additional word data group DWI having a word transmission rate of 50 MBps from the word data transmitting unit 45 and the additional word data group DWP having a word transmission rate of 100 MBps from the word data transmitting unit 46 has 10 bits. Although it is configured as 10-bit word string data including word synchronization data, in one example, from the start end to the end, it is 10-bit word synchronization data + K28.5, optional auxiliary 10
Bit word data DXX ・ X, ..., DYY ・
Y and + K28.5 are sequentially connected.

In the composite 10-bit word string data DZ (10) formed by inserting one example of the above-mentioned additional word data group DWI or DWP, the portion in which the additional word data group DWI or DWP is inserted is shown in FIG. As shown, it is assumed to include + K28.5 which is 10-bit word synchronization data. In FIG. 9, DV
10 is 10-bit word string data DXZ '(10) obtained from each of the memory units 53 and 54 shown in FIG.
Represents each 10-bit word data forming the.

The composite 10-bit word string data DZ
In the case (10) in which the portion in which the additional word data group DWI or DWP is inserted is as shown in FIG. 9, the additional word data group DW
I or DWP is composite 10-bit word string data D
In the portion of Z (10) where the additional word data group DWI or DWP is inserted, 10-bit word synchronization data with RD being positive (+), that is, + K
28.5 has been selected to be included.
However, in some cases, the composite 10-bit word string data DZ (10) is added to the additional word data group D.
Under the assumption that the portion in which the WI or DWP is inserted is similar to that shown in FIG. 8, the additional word data group DWI or DWP is the composite 10
The bit word string data DZ (10) includes 10-bit word synchronization data having negative RD (-), that is, -K28.5, in a portion where the additional word data group DWI or DWP is inserted. May be selected for.

Under the above-mentioned conditions, the composite 10-bit word string data DZ from the composite word string data forming section 41 is obtained.
The P / S conversion unit 61 to which (10) is supplied performs P / S conversion on the composite 10-bit word string data DZ (10) to generate bits based on the composite 10-bit word string data DZ (10). The transmission rate is 50 MBps × 10 = 0.
5 Gbps or 100 MBps × 10 = 1 Gbps
To form serial data DZS and supply the serial data DZS to the transmitter 62. The transmitting unit 62 transmits the serial data DZS through a data transmission line formed by using a coaxial cable or an optical fiber, for example, and an electric signal suitable for the data transmission line formed by using the coaxial cable. Alternatively, it is transmitted as a transmission signal SZ which is an optical signal or the like suitable for a data transmission path formed by using an optical fiber. Thereby, the serial data DZS is transmitted.

In the data transmission apparatus shown in FIG. 6 as described above, the P / S conversion unit 61 and the transmission unit 62 have a word transmission rate of 50 MBps or 100 MBps.
Composite 10-bit word string data DZ (10)
Bit transmission rate of 0.5 Gbps or 1 Gbps
Since it is converted into serial data DZS and transmitted, the P / S converter 61 and the transmitter 62
Can be configured, for example, by effectively utilizing an integrated circuit element or the like provided for transmitting a digital video signal under a fiber channel system.
Therefore, the 8B / 10B conversion and the addition of the word synchronization data are performed on the data to be transmitted, and the 8B / 10B conversion based on the data to be transmitted and the word string data including the word synchronization data are performed. When transmitting the compressed digital video signal by the transmission method in which the word string data is formed and converted into serial data and transmitted, for example, either the compressed digital video signal DCI or DCP is to be transmitted. Even in this case, the data forming the compressed digital video signal to be transmitted can be accurately discriminated, and it can be compared properly and at an appropriate transmission speed with good transmission quality. It can be transmitted using a means that can be easily arranged.

FIG. 10 shows the invention described in claim 21 of the present application in which an example of the data receiving method according to the invention described in claim 20 of the present application is implemented. An example of such a data receiving apparatus is shown.

In the example of the data receiving apparatus shown in FIG. 10, for example, a data transmission line formed by using a coaxial cable or a data transmission line formed by using an optical fiber is used. A receiver 71 is provided for receiving the transmitted transmission signal SZ. The transmission signal SZ has a bit transmission rate of 0.5 G transmitted by the data transmission device shown in FIG. 1, for example.
Serial data DZS with bps or 1 Gbps
It is based on.

When receiving the transmission signal SZ, the receiving unit 71 reproduces the serial data DZS having a bit transmission rate of 0.5 Gbps or 1 Gbps from the received transmission signal SZ and synchronizes the reproduced serial data DZS. The data is detected and supplied to the S / P converter 72.

In the synchronous data detection / S / P conversion unit 72, + K28.5 which is 10-bit word synchronous data in the serial data DZS whose supplied bit transmission rate is 0.5 Gbps or 1 Gbps.
(Or -K28.5) is converted into serial data, the detected portion is detected as synchronization data, and word synchronization based on the detected synchronization data is taken to obtain the serial data DZS.
Is subjected to S / P conversion to obtain parallel data based on the serial data DZS.

At this time, the synchronous data detection / S / P conversion unit 7
2, the serial data DZS from the receiving unit 71
Is supplied by the built-in operation control unit,
For example, the control shown by the flowchart shown in FIG. 11 is performed and the bit transmission rate is set to 0.5 Gbp.
The reception state for the serial data DZS of s or 1 Gbps is set.

In the control shown by the flow chart in FIG. 11, first, after the start, in step 75, 1 Gbps, which is an operation state in which the serial data DZS having a bit transmission rate of 1 Gbps can be properly received. The reception mode is set, and in the subsequent step 76, the mode flag FL is set to "1".

Next, in step 77, it is judged whether or not parallel data based on the serial data DZS is obtained as an output signal, that is, whether or not there is parallel data output. As a result, when there is no parallel data output, the determination in step 77 is repeated.

If the result of determination in step 77 is that there is parallel data output, step 78
In the phase locked loop (PL
It is determined whether L) is in the locked state.

If the result of determination in step 78 is that the PLL is not locked, it is determined in step 79 whether the mode flag FL is "1". As a result, when the mode flag FL is "1", the bit transmission rate is set to 0.
The 0.5 Gbps reception mode, which is an operation state capable of properly receiving the serial data DZS of 5 Gbps, is set, and in the following step 81, the mode flag FL is set to "0", and the process returns to step 78 and the step Each step after 78 is repeated.

On the other hand, as a result of the judgment in step 78, PL
When L is in the locked state, the process returns to step 77 and the steps after step 77 are repeated.

Further, as a result of the judgment in step 79, if the mode flag FL is not "1", step 7
Returning to step 5, the steps after step 75 are repeated.

In this way, the bit transmission rate is set to 0.
Serial data D of 5 Gbps or 1 Gbps
Synchronous data detection where SZ reception status is taken S /
In the P converter 72, the bit transmission rate is set to 0.5G.
The reception state for the serial data DZS of bps is taken, and the bit transmission rate from the receiving unit 71 is 0.5.
When the serial data DZS of Gbps is properly received, composite 10-bit word string data DZ (10) which is parallel data having a word transmission rate of 50 MBps is formed based on the serial data DZS.
Further, when the reception state for the serial data DZS having a bit transmission rate of 1 Gbps is taken and the serial data DZS having a bit transmission rate of 1 Gbps is properly received from the receiving unit 71, based on the serial data DZS, Composite 10-bit word string data DZ (10) that is parallel data having a word transmission rate of 100 MBps is formed.

Composite 10-bit word string data D obtained by the synchronous data detection / S / P conversion unit 72 and having a word transmission rate of 50 MBps or 100 MBps.
Z (10) is the additional word data group DWIP or DWPP or the additional word data group D
The additional word data group DWIP or DWPP in the composite 10-bit word string data DZ (10), or the part including the additional word data group DWIN or DWPN is the additional word data group DWIP or D.
WPP or additional word data group DWIN
Alternatively, depending on the contents of the DWPN, for example, A in FIG.
Or, as shown in C. Then, the composite 10-bit word string data DZ (10) obtained from the synchronous data detection / S / P conversion unit 72 is supplied to the data restoration unit 82.

Further, the synchronous data detection / S / P conversion unit 72
, The composite 10-bit word string data D with a word transmission rate of 50 MBps or 100 MBps
Additional word data group DWIP in Z (10)
Alternatively, it detects + K28.5 (or -K28.5) in the DWPP or the additional word data group DWIN or DWPN, and outputs the K28.5 detection output signal SWS. This K28.5 detection output signal SW
S is an additional word data group DWIP or DWP in the composite 10-bit word string data DZ (10)
Depending on P, or the contents of the additional word data group DWIN or DWPN, for example, as shown in B or D of FIG.

As described above, the synchronous data detection / S /
K28.5 detection output signal SW obtained from the P conversion unit 72
S is supplied to the control signal forming unit 83. In the control signal forming unit 83, the synchronization control signal CW based on the K28.5 detection output signal SWS is formed.

The word transmission rate from the synchronous data detection / S / P converter 72 is set to 50 MBps or 100 MBp.
The control signal forming unit 83 is included in the data restoring unit 82 to which the composite 10-bit word string data DZ (10) of s is supplied.
The synchronization control signal CW from is also supplied. Then, in the data restoration unit 82, the composite 10-bit word string data DZ (10) is supplied to the word data separation / speed conversion unit 85. In the word data separation / speed conversion unit 85,
The synchronization control signal CW from the control signal forming unit 83 is also supplied.

In the word data separation / speed conversion section 85, under the control of synchronization by the synchronization control signal CW, the composite 10-bit word string data DZ (10)
Word transmission rate of 50MBps or 100MBp
10-bit word string data DXZ (10) to be s,
Additional word data group DWIP or DWPP,
Alternatively, the 10-bit word string data forming the additional word data group DWIN or DWPN is separated and taken out.

Further, in the word data separation / speed conversion formation unit 85, the composite 10-bit word string data DZ is used.
10-bit word string data D extracted from (10)
The word transmission rate of XZ (10) is 50M.
Transmission rate conversion to convert from Bps to 74.25MBps, or its word transmission rate is 100MBps
To 148.5 MBps, and the converted 10-bit word string data DX (10) is reproduced.

As a result, the additional word data group DWIP or DWPP or the additional word data group DWI is output from the word data separation / speed conversion unit 85.
N or DWPN is taken out and the word transmission rate is 74.25MBps or 148.5MB
Converted 10-bit word string data DX (10) to ps
Is transmitted and is supplied to the 10B / 8B conversion unit 86.

In the 10B / 8B conversion unit 86, the conversion 10-bit word string data DX (10) is converted into 10B.
/ 8B conversion is performed, thereby increasing the word transmission rate to 7
The compressed digital video signal DCI forming the 8-bit word string data at 4.25 MBps or the compressed digital video signal DCP forming the 8-bit word string data at the word transmission rate of 148.5 MBps is restored.
Then, the compressed digital video signal DCI or DCP decompressed in the 10B / 8B conversion unit 86 is derived from the data decompression unit 82.

FIG. 13 is described in claim 21 of the present application, in which another example of the data receiving method according to the invention described in claim 20 of the present application is implemented. 6 shows another example of the data receiving apparatus according to the invention.

In the example of the data receiving apparatus shown in FIG. 13, for example, a data transmission line formed by using a coaxial cable or a data transmission line formed by using an optical fiber is used. A receiving unit 88 for receiving the transmitted transmission signal SZ is provided. The transmission signal SZ has a bit transmission rate of 0.5 G transmitted by the data transmission device shown in FIG. 6, for example.
Serial data DZS with bps or 1 Gbps
It is based on.

When receiving the transmission signal SZ, the receiving unit 88 reproduces the serial data DZS having a bit transmission rate of 0.5 Gbps or 1 Gbps from the received transmission signal SZ and synchronizes the reproduced serial data DZS. The data is detected and supplied to the S / P converter 89.

In the synchronous data detection / S / P conversion unit 89, + K28.5 which is 10-bit word synchronous data in the serial data DZS whose supplied bit transmission rate is 0.5 Gbps or 1 Gbps.
(Or -K28.5) is converted into serial data, the detected portion is detected as synchronization data, and word synchronization based on the detected synchronization data is taken to obtain the serial data DZS.
Is subjected to S / P conversion to obtain parallel data based on the serial data DZS.

At this time, the synchronous data detection / S / P conversion unit 8
9, the serial data DZS from the receiving unit 88 is received.
Is supplied, the same operation as in the case of the synchronous data detection / S / P conversion unit 72 shown in FIG. 10 is performed.

The bit transmission rate is set to 0.5 Gbp.
In the synchronous data detection / S / P conversion unit 89 which is in the reception state for the serial data DZS of s or 1 Gbps, the reception unit 88 receives the reception state of the serial data DZS of which the bit transmission rate is 0.5 Gbps. Bit transmission rate from 0.5 Gbp
When the serial data DZS of s is properly received, the composite data 1 is parallel data based on the serial data DZS and having a word transmission rate of 50 MBps.
The 0-bit word string data DZ (10) is formed. When the serial data DZS having the bit transmission rate of 1 Gbps is received and the serial data DZS having the bit transmission rate of 1 Gbps is properly received from the receiving unit 88, the serial data DZS is received.
Composite 10-bit word string data DZ (10), which is parallel data based on ZS and having a word transmission rate of 100 MBps, is formed.

Composite 10-bit word string data D obtained at the synchronous data detection / S / P conversion unit 89 and having a word transmission rate of 50 MBps or 100 MBps.
Z (10) includes the additional word data group DWI or DWP, and the additional word data group DWI in the composite 10-bit word string data DZ (10).
Alternatively, the portion including the DWP is set as shown in A of FIG. 14, for example, according to the content of the additional word data group DWI or DWP. Then, the composite 10-bit word string data DZ (10) obtained from the synchronous data detection / S / P conversion unit 89 is supplied to the data restoration unit 90.

Further, the synchronous data detection / S / P conversion unit 89
, The composite 10-bit word string data D with a word transmission rate of 50 MBps or 100 MBps
+ K28.5 (or -K28. In the additional word data group DWI or DWP in Z (10)).
5) is detected and the K28.5 detection output signal SWS is transmitted. This K28.5 detection output signal SWS is
Depending on the contents of the additional word data group DWI or DWP in the bit word string data DZ (10),
For example, it is obtained as shown in B of FIG.

As described above, the synchronous data detection / S /
K28.5 detection output signal SW obtained from the P conversion unit 89
S is supplied to the control signal forming unit 91. In the control signal forming unit 91, the synchronization control signal CW based on the K28.5 detection output signal SWS is formed.

The word transmission rate from the synchronous data detection / S / P conversion unit 89 is set to 50 MBps or 100 MBp.
The control signal forming unit 91 is included in the data restoring unit 90 to which the composite 10-bit word string data DZ (10) of s is supplied.
The synchronization control signal CW from is also supplied. Then, in the data restoration unit 90, the composite 10-bit word string data DZ (10) is supplied to the word data separation / speed conversion unit 94. In the word data separation / speed conversion unit 94,
The synchronization control signal CW from the control signal forming unit 91 is also supplied.

In the word data separation / speed conversion unit 94, under the synchronous control by the synchronous control signal CW, the composite 10-bit word string data DZ (10)
Word transmission rate of 50MBps or 100MBp
10-bit word string data DXZ (10) to be s,
The 10-bit word string data forming the additional word data group DWI or DWP is separated and taken out.

Furthermore, in the word data separation / speed conversion formation unit 94, the composite 10-bit word string data DZ is used.
10-bit word string data D extracted from (10)
The word transmission rate of XZ (10) is 50M.
Transmission rate conversion to convert from Bps to 74.25MBps, or its word transmission rate is 100MBps
To 148.5 MBps, and the converted 10-bit word string data DX (10) is reproduced.

As a result, from the word data separation / speed conversion unit 94, the additional word data group DWI or D
As WP is taken out, the word transmission rate is set to 7
The converted 10-bit word string data DX (10) of 4.25 MBps or 148.5 MBps is sent out and supplied to the 10B / 8B converter 95.

In the 10B / 8B conversion unit 95, the conversion 10-bit word string data DX (10) is converted into 10B.
/ 8B conversion is performed, thereby increasing the word transmission rate to 7
The compressed digital video signal DCI forming the 8-bit word string data at 4.25 MBps or the compressed digital video signal DCP forming the 8-bit word string data at the word transmission rate of 148.5 MBps is restored.
Then, the compressed digital video signal DCI or DCP decompressed in the 10B / 8B conversion unit 95 is derived from the data decompression unit 90.

In the data receiving apparatus shown in FIG. 10 or 13 as described above, for example, the bit transmission rate transmitted by the data transmitting apparatus shown in FIG. 1 or 6 is 0.5 Gbps or 1 Gbps. Serial data DZS is received, the received serial data DZS is subjected to S / P conversion processing, and further, word sync data is separated and 10B / 8B conversion is applied to a predetermined digital video signal. A portion in which compressed data obtained by performing data compression in units of divided periods exists and a portion in which such compressed data does not exist,
Either the compressed digital video signal DCI or DCP, which is a compressed digital video signal that is alternately arranged, is reliably reproduced.

[0169]

As is apparent from the above description, the data transmission method according to the invention described in any one of claims 1 to 7 in the claims of the present application, and the claims of the present application Claim 15 or Claim 1 in
In the data transmission device according to the invention described in 6,
The composite word string data based on the compressed digital video signal, which is converted into serial data and transmitted for transmission, is assumed to be obtained by subjecting the compressed digital video signal to 8B / 10B conversion, and is predetermined. The word synchronization data to which the assigned code is assigned is included.

Then, the composite word string data including the word synchronization data to which the predetermined code is assigned, which is transmitted as serial data, is assigned the predetermined code on the receiving side which receives it. The word synchronization data thus obtained will be properly detected as the word synchronization data required for the S / P conversion processing and the processing for reproducing the compressed digital video signal from the word string data. Moreover, since 8B / 10B conversion is performed, good transmission quality can be obtained. Therefore, on the receiving side, the reproduction of the composite word string data based on the received serial data and the reproduction of the compressed digital video signal are surely performed.

[0171] Further, the data transmission method according to the invention described in any one of claims 8 to 14 in the claims of the present application, and claims 17 to 19 in the claims of the present application. In the data transmission apparatus according to the invention described in any of the above, it is possible to determine whether the input compressed digital video signal is, for example, the compressed digital video signal DCI or the compressed digital video signal DCP. The determination is performed accurately by determining the clock frequency of the compressed digital video signal, and a determination output signal corresponding to the determination result is obtained. Then, for example, the conversion word string data is formed by 8B / 10B conversion for the data forming the compressed digital video signal which is the compressed digital video signal DCI or DCP, and further, the word synchronization is performed with the conversion word string data. The process of inserting the additional word data group including the data is properly performed in a manner corresponding to the discrimination output signal, and the composite word string data having the transmission rate according to the discrimination output signal is formed.

The compound word string data thus obtained is
For example, compressed digital video signal DCI or DCP
, Which is based on the input compressed digital video signal, but the transmission speed of which is determined according to the determination output signal. Suitable for either signal DCI or DCP. Then, the composite word sequence data that makes the transmission rate suitable for the input compressed digital video signal is converted into serial data and transmitted, which includes word synchronization data having a preset code. It is supposed to be.

In the composite word string data thus converted into serial data and transmitted, the word synchronization data having a preset code is converted into the compressed digital video signal DCI or DCP on the receiving side. It is supposed that the word sync data is properly detected as the word synchronization data required for the processing for reproducing the compressed digital video signal. In addition, since the word string data other than the word synchronization data included in the composite word string data converted into the serial data and transmitted is obtained through the 8B / 10B conversion process, good transmission quality can be obtained. Will bring. Therefore, on the receiving side, the reproduction of the composite word string data based on the serial data received under the condition that the good transmission quality is obtained, and further, the compression of the compressed digital video signal DCI or DCP, for example, is performed. A state in which the data synchronization state required for the processing for reproducing the digital video signal is reliably obtained is ensured.

Therefore, the data transmission method according to the invention described in any one of claims 8 to 14 in the claims of the present application, or claims 17 to 19 in the claims of the present application. According to the data transmission device according to the invention described in any of the above, 8B / 10B conversion based on the data to be transmitted is performed by performing 8B / 10B conversion and addition of word synchronization data to the data to be transmitted. When a compressed digital video signal is transmitted by a transmission method in which conversion is performed and word string data including word synchronization data is formed, and the word string data is converted into serial data and sent out, for example, compressed digital Either the video signal DCI or DCP should be transmitted as a compressed digital video signal. Even if it is, the data for forming a compressed digital video signal to be its transmission to accurately determine, by Moto that it is good transmission quality is obtained,
It is possible to properly transmit with an appropriate transmission speed.

Further, according to the data receiving method according to the invention described in claim 20 in the scope of claims of the present application, or the data receiving device according to the invention described in claim 21 in the scope of claims of the present application. For example, for example, the data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application,
Alternatively, the serial data transmitted by the data transmission device according to the invention described in any one of claims 15 to 19 in the claims of the present application is received, and the received serial data has S / P. Conversion processing is performed, and further, separation of word synchronization data and 10B /
8B conversion is performed, and a portion where compressed data obtained by subjecting the digital video signal to data compression in units of a predetermined division period and a portion where such compressed data does not exist are alternately arranged. The compressed digital video signal composed of is surely reproduced.

[Brief description of drawings]

FIG. 1 to claim 15 in the claims of the present application, in which an example of a data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application is implemented. FIG. 20 is a block configuration diagram showing an example of a data transmission device according to the invention described in any one of claims 19 to 19;

FIG. 2 is a time chart provided for explaining an example of the data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application.

FIG. 3 is a block configuration diagram showing a specific configuration example of a rate conversion / synchronization data insertion unit in the data transmission device shown in FIG. 1.

FIG. 4 is a conceptual diagram provided for explaining 10-bit word data used in an example of the data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application. is there.

FIG. 5 is a time chart provided for explaining an example of the data transmission method according to the invention described in any one of claims 1 to 14 in the claims of the present application.

FIG. 6 is a patent of the present application in which an example of a data transmission method according to the invention described in any one of claims 1 to 3 and claims 5 to 14 in the claims of the present application is implemented. It is a block block diagram which shows an example of the data transmission apparatus which concerns on invention of Claim 15, Claim 17 or Claim 18 in a claim.

FIG. 7 is a time chart provided for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 3 and claims 5 to 14 in the claims of the present application. Is.

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

FIG. 9 is a time chart provided for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 3 and claims 5 to 14 in the claims of the present application. Is.

FIG. 10: Claim 20 within the scope of the claims of the present application
22 is a block configuration diagram showing an example of a data receiving device according to the invention described in claim 21 of the present application, in which an example of the data receiving method according to the invention described in FIG.

11 is a flowchart provided for explaining the operation of the synchronous data detection / S / P conversion unit in the data reception device shown in FIG.

FIG. 12 is a time chart used for explaining the operation of the data receiving apparatus shown in FIG.

FIG. 13: Claim 20 within the scope of the claims of the present application
22 is a block diagram showing another example of the data receiving apparatus according to the invention described in claim 21 of the present application, in which another example of the data receiving method according to the invention described in FIG. .

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

FIG. 15 is a conceptual diagram provided for explaining a “frame” used in transmission of digital data.

FIG. 16 is a conceptual diagram provided for explaining word synchronization data used in transmission of digital data.

FIG. 17 is a conceptual diagram provided for explaining an example of a data format of a digital video signal.

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

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

[Explanation of symbols]

11, 41 ... Compound word string data forming unit, 12,
42 ... Clock frequency discrimination unit, 13, 43 ...
8B / 10B conversion unit, 14, 44 ... Speed conversion / synchronization data insertion unit, 15-18, 45, 46 ... Word data transmission unit, 19, 20, 47 ... Data addition unit, 21, 26 , 27, 30, 51, 56, 57 ...
Switch, 22, 52 ... switch control signal forming unit, 23, 24, 53, 54 ... memory unit, 2
5, 55 ... Memory control signal forming unit, 28, 58
..SHC; SEC detection unit, 29, 59 ... Control signal formation unit, 31, 61 ... P / S conversion unit, 32,
62 ... Transmitting unit, 71, 88 ... Receiving unit, 7
2, 89 ... Synchronous data detection / S / P conversion unit, 8
2, 90 ... Data restoration unit, 83, 91 ... Control signal formation unit, 85, 94 ... Word data separation / speed conversion unit, 86, 95 ... 10B / 8B conversion unit

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5C059 KK31 LA02 MA00 RC02 RE01                       UA09 UA24                 5C063 AA11 AB03 AC01 AC10 CA11                       CA14 DA01 DA07 DA13                 5K028 AA08 EE03 KK23 MM16 NN00                 5K029 AA18 EE11 GG03 HH21

Claims (21)

[Claims] 1. A compression in which a portion containing compressed data obtained by subjecting a digital video signal to data compression in units of a predetermined division period and a portion not containing the compressed data are alternately arranged. 8 for digital video signals
8 bits / 1, which is converted to 10 bits for each bit
A 0-bit conversion process is performed to form converted word string data based on the compressed digital video signal, and a portion of the converted word string data where compressed data does not exist includes word synchronization data having a preset code. A data transmission method in which an additional word data group is inserted to obtain compound word string data, the compound word string data is converted to serial data, and the serial data is transmitted to be transmitted. 2. An 8-bit word string obtained by compressing compressed data constituting a compressed digital video signal to image information data representing a predetermined division period of the digital video signal, by performing data compression by high efficiency coding. The data transmission method according to claim 1, wherein the data transmission is data. 3. The data transmission method according to claim 2, wherein a predetermined divided period of the digital video signal is set as each frame period of the digital video signal. 4. An additional word data group having a different code depending on whether the running disparity of the word data immediately before the additional word data group in the converted word string data is positive or negative. The data transmission method according to any one of claims 1 to 3, wherein: 5. The additional word data group is selected so that the composite word string data will include word synchronization data having a positive running disparity. The data transmission method described in any of the above. 6. The additional word data group is selected as one in which composite word sequence data includes word synchronization data having a negative running disparity. The data transmission method described in any of the above. 7. The additional word data group includes auxiliary word data, and the auxiliary word data is selected to have a running disparity of neutral, according to any one of claims 1 to 6. The data transmission method described in. 8. A compression in which a portion in which compressed data obtained by subjecting a digital video signal to data compression in units of a predetermined division period and a portion in which the compressed data does not exist are alternately connected. 8-bit / 10-bit conversion in which the clock frequency of the digital video signal is discriminated, a discrimination output signal corresponding to the discriminated clock frequency is obtained, and the compressed digital video signal is converted into 10 bits every 8 bits. Additional word data that is processed to form the converted word string data based on the compressed digital video signal, and the word synchronization data having a preset code is included in a portion of the converted word string data where the compressed data does not exist. By performing the process of inserting a group in a manner corresponding to the determination output signal, the transmission rate is determined as described above. To form a composite word sequence data to that corresponding to the force signal, and converts the composite word sequence data to serial data, the data transmission method for sending in order to transmit the serial data. 9. An 8-bit word string obtained by compressing compressed data constituting a compressed digital video signal, to image information data representing a predetermined division period of the digital video signal, and performing data compression by high efficiency coding. The data transmission method according to claim 8, wherein the data transmission is data. 10. The data transmission method according to claim 9, wherein a predetermined divided period of the digital video signal is set as each frame period of the digital video signal. 11. The additional word data group is transmitted when the processing of inserting the additional word data group in a portion of the converted word sequence data where the compressed data of the compressed digital video signal does not exist is carried out in a manner corresponding to the discrimination output signal. 9. The method according to claim 8, wherein one of a plurality of additional word data groups having different speeds is selected as one corresponding to the discrimination output signal.
The data transmission method according to any one of 0 to 0. 12. A method of inserting an additional word data group into a portion of the converted word string data where compressed data does not exist in a manner corresponding to a discrimination output signal, wherein the additional word data group is run as composite word string data. The data transmission method according to any one of claims 8 to 11, characterized in that it is selected to include word synchronization data having a positive disparity. 13. A method of inserting an additional word data group into a portion of the converted word string data where compressed data does not exist in a manner corresponding to a discrimination output signal, wherein the additional word data group is run as composite word string data. The data transmission method according to any one of claims 8 to 11, characterized in that it is selected to include word synchronization data having a negative disparity. 14. When the processing of inserting the additional word data group into a portion of the converted word string data where the compressed data does not exist is performed in a manner corresponding to the discrimination output signal, the additional word data group includes auxiliary word data, Running the auxiliary word data
14. The data transmission method according to claim 8, wherein the disparity is selected to be neutral. 15. A compression in which a portion in which compressed data obtained by subjecting a digital video signal to data compression in units of a predetermined divided period and a portion in which the compressed data does not exist are alternately connected. 8 for digital video signals
8 bits / 1, which is converted to 10 bits for each bit
8 bits / 1 for forming 0-bit conversion processing to form conversion word string data based on the compressed digital video signal
An additional word data group including word synchronization data having a preset code is inserted into the 0-bit conversion means and a portion of the conversion word string data obtained from the 8-bit / 10-bit conversion means where compressed data does not exist. And a data sending means for converting the compound word string data obtained from the sync data inserting means into serial data and sending the serial data for transmission. A data transmission device configured. 16. Synchronous data insertion means comprises first and second word data transmission units for deriving first and second additional word data groups having different codes from each other, respectively.
When the running disparity of the word data immediately preceding the additional word data group in the converted word string data is positive, the first additional word is added to the portion of the converted word string data where compressed data does not exist. When a data group is inserted and the running disparity of the immediately preceding word data is negative, the second additional word data group is inserted in a portion of the converted word string data where compressed data does not exist. The data transmission device according to claim 15, wherein the data transmission device comprises: 17. A compression in which a portion in which compressed data obtained by subjecting a digital video signal to data compression in units of a predetermined division period and a portion in which the compressed data does not exist are alternately connected. A clock frequency discriminating means for discriminating a clock frequency of the digital video signal to obtain a discrimination output signal according to the discriminated clock frequency, and the compressed digital video signal is converted into 10 bits every 8 bits. 8-bit / 10-bit conversion means for performing bit / 10-bit conversion processing to form conversion word string data based on the compressed digital video signal, and compression in the conversion word string data obtained from the 8-bit / 10-bit conversion means An additional word data containing word synchronization data having a preset code in the part where data does not exist. Synchronous data inserting means for forming composite word string data having a transmission rate according to the discrimination output signal by performing the processing for inserting a group in a manner corresponding to the discrimination output signal, and the synchronous data insertion means. A data transmission device configured to convert the composite word string data obtained from the means to serial data and send the serial data to transmit the serial data. 18. Synchronous data inserting means comprises a plurality of word data sending parts for respectively deriving a plurality of additional word data groups having different transmission rates, and a plurality of word data sending parts respectively derived from the plurality of word data sending parts. One of the additional word data groups corresponding to the discrimination output signal is selected, and the selected additional word data group is inserted into a portion of the conversion word string data where the compressed data of the compressed digital video signal does not exist. The data transmission device according to claim 17, 19. A first word data transmission section group comprising a plurality of word data transmission sections for deriving a plurality of first additional word data groups having different transmission rates from each other, and said synchronous data insertion section, A second word composed of a plurality of word data sending units which respectively derive a plurality of second additional word data groups having different codes from the plurality of first additional word data groups and different transmission rates from each other. A group of data transmission units, and when the running disparity of the word data immediately preceding the additional word data group in the converted word string data is positive, a plurality of the first word data transmission units are formed. Selecting one corresponding to the discrimination output signal from the plurality of first additional word data groups respectively derived from the word data sending unit, The selected first additional word data group is inserted into a portion of the conversion word string data in which compressed data of the compressed digital video signal does not exist, and is immediately before the additional word data group in the conversion word string data. When the running disparity of the word data is negative, the discriminative output is made from the plurality of second additional word data groups respectively derived from the plurality of word data transmitting units forming the second word data transmitting unit group. 2. The one corresponding to the signal is selected, and the selected second additional word data group is inserted into a portion of the converted word string data where the compressed data of the compressed digital video signal does not exist.
8. The data transmission device according to item 8. 20. Receive serial data formed by converting composite word sequence data including word synchronization data having a preset code, and receiving the serial data,
By serial / parallel conversion processing, it is converted into composite word sequence data containing the word synchronization data, the word synchronization data is separated from the composite word sequence data to obtain conversion word sequence data, and the conversion word sequence data is obtained. A 10-bit / 8-bit conversion process for converting 10 bits into 8 bits is performed, and data compression is performed on the digital video signal based on the conversion word string data in units of a predetermined division period. A data receiving method for reproducing a compressed digital video signal in which a portion where the obtained compressed data exists and a portion where the above compressed data does not exist are alternately arranged. 21. Receiving means for receiving serial data formed by converting composite word sequence data containing word synchronization data having a preset code, and serial data received by the receiving means are serialized. / Parallel conversion processing converts serial / parallel conversion means into composite word sequence data containing the word synchronization data, and separates and converts the word synchronization data from the composite word sequence data obtained from the serial / parallel conversion means. The word data separating means for obtaining the word string data and the converted word string data obtained by the word data separating means are converted into 8 bits every 10 bits.
A bit / 8 bit conversion process, and based on the converted word string data, a portion in which there is compressed data obtained by subjecting the digital video signal to data compression in units of predetermined division periods; A data receiving apparatus comprising: a 10-bit / 8-bit converting means for reproducing a compressed digital video signal, which is alternately arranged with a portion where no.