JP2001292181A - Method and device for data transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly transmit any of plural kinds of digital video signals with secure discrimination of it and at a proper transmission speed in a transmission system for converting work string data, which is given the insertion of word synchronizing data and 8B/10B conversion based on data which has to be transmitted, and sending it. SOLUTION: By performing processing for discriminating the clock frequency of an input digital video signal, to generate a discrimination output signal and inserting an additional word data group including word synchronizing data to data, for forming the input digital video signal by a mode corresponding to the discrimination output signal, a composite 8-bit word string data for making a transmission rate correspond to the discrimination output signal is formed. By using a P/S conversion means, which incorporates a 8B/10B conversion means, the composite 8-bit word string data is given 8B/10B conversion of form composite 10-bit word string data for making the transmission rate correspond to the discrimination output signal and is converted into serial data to be sent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention described in the claims of the present application obtains word string data in which words of a predetermined number of bits are consecutive based on an input digital video signal, inserts word synchronization data into the word string data, and performs word synchronization. The word string data into which the data has been inserted is subjected to 8-bit / 10-bit conversion to obtain 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 method for transmitting data and a data transmission apparatus provided 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 converted into serial data, an electric signal based on the serial data is obtained, and the signal is coaxial. A system for transmitting data through a transmission line formed using a cable or twisted pair line,
Alternatively, digital data is converted into serial data, and the serial data is converted into an optical signal, and the optical
Systems and the like for transmitting data through a transmission line formed using fibers have been proposed.

As one of such digital data transmission systems, a fiber channel system (Fibre Chord) has been proposed.
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, conversion into 10 bits is performed every 8 bits, and the conversion is performed according to a conversion table prepared in advance.
/ 10B conversion) and forms word string data such as 10-bit word string data. What is actually transmitted is parallel / serial conversion (P / P / P), which converts word data such as 10-bit word string data formed by performing 8B / 10B conversion processing, and further converts parallel data into serial data. This is serial data obtained by performing S conversion) processing.

On the other hand, on the receiving side, the received serial data is subjected to a serial / parallel conversion (S / P conversion) process for converting the serial data into parallel data, thereby obtaining 10-bit word string data and the like. Is converted to 8 bits for every 10 bits, and the conversion is performed according to 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 performing the 10B / 8B conversion processing.

[0005] Such data transmission in which digital data to be transmitted is subjected to 8B / 10B conversion has been recognized as providing good transmission quality.

In a digital data transmission system such as a fiber channel system, digital data transmitted as, for example, 10-bit word string data is, for example, as shown in FIG. It follows the data format in which the smallest independent packet called a "frame" is formed. The "frame" shown in FIG. 10 has a total of 2148 bytes, and includes a 4-byte frame start portion, a 24-byte frame header portion, and a 64-byte optional header portion. , A 2048-byte payload portion, a 4-byte error check portion, and a 4-byte frame end portion are sequentially connected.

[0007] A 2048-byte payload portion of each portion constituting these "frames" stores 10-bit word string data representing signal information. That is,
For example, when transmitting 10-bit word string data, a maximum of 20
A large number of "frames" each storing 48-byte 10-bit word string data are formed and sequentially transmitted. On the receiving side, the 10-bit word string data is read from the payload portion of each of the sequentially arriving "frames". Take out.

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

When the 10-bit word string data is transmitted as described above, the serial data received on the receiving side is subjected to an S / P conversion process for obtaining the 10-bit word string data. In the 10B / 8B conversion or the like performed on the 10-bit word string data obtained by the S / P conversion processing, it is necessary to accurately grasp each word data of the 10-bit configuration. The transmitted and transmitted 10-bit word string data is appropriately inserted with word synchronization data. The word synchronization data is a word data having a 10-bit structure, but has a specific code which is not used as the word data having a 10-bit structure for transmitting information. When the word synchronization data is inserted, the RD is made positive when the immediately preceding word data makes the RD negative, and the word synchronization data is obtained when the immediately preceding word data makes the RD positive. At some point, RD is made negative.

Such word synchronization data is, for example,
This is word data DS10 having a 10-bit configuration called a code name of K28.5. FIG.
The word data DS10 having a 10-bit structure called by a code name of 8.5 is shown.
0 indicates that the RD is positive when the CRD, which is the RD of the immediately preceding word data, is negative (-).
1111 1010 ", and when the CRD which is the RD based on the immediately preceding word data is positive (+), it is set to" 110000 0101 "in which the RD is negative (hereinafter" 001111 1010 "is replaced by + K28). .5
And "110000 0101" is -K2
8.5).

On the other hand, in the field of video signals, digital transmission of video signals has been attempted from the viewpoint of diversifying transmitted information and improving the quality of reproduced images in connection with the transmission. Standardized digital video signals for digital transmission of video signals have been proposed, such as 4: 2: 2 component digital video signal (D1 signal), 4fsc composite digital video signal (D2 signal), A digital video signal (480P signal) and the like standardized to enable reproduction of an image screen having an aspect ratio of 16: 9 under the condition that the number of lines per real frame screen is 483 is known. I have. These D1 signal, D2 signal, 480P signal, etc.
For example, 10 represents a luminance signal component in a video signal.
A word multiplexing process is performed on the Y data sequence as the bit word sequence data and the _CB / _CR data sequence as the 10 bit word sequence data representing the color difference signal component in the video signal, and the result is obtained. A predetermined portion of the word multiplexed data sequence is composed of timing reference code data (SAV: Start of Active Video and EA).
V: End of Active Video). SAV and EAV play the role of word synchronization data.

For example, the data sequence constituting the D1 signal takes the form of 10-bit word string data.
It follows the data format as shown in FIG. FIG. 12 shows a line blanking period in each line period of the D1 signal and a portion corresponding to a part of the video data period before and after the line blanking period. In such a part, immediately before a part corresponding to each video data period, four words (3F) each having a 10-bit configuration are used.
SAV, which is timing reference code data composed of F, 000,000, XYZ), is provided, and immediately after a portion corresponding to each video data period, four words (3FF, 000,000, 10FF) each having a 10-bit configuration are provided. 000, XY
Z) EAV which is timing reference code data
Is arranged. 3FF and 000 are fixed value information displayed in hexadecimal, XYZ is variable value information displayed in hexadecimal, and indicates field identification, field blanking period identification, and SAV and EAV identification.

When the D1 signal forming the 10-bit word string data as shown in FIG. 12 is transmitted, it is converted into serial data by P / S conversion processing and transmitted. Then, on the receiving side, a portion based on SAV or EAV in the received serial data is detected and subjected to S / P conversion under the word synchronization thereby to reproduce the D1 signal. .

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

In the standard system called MPEG, digital image information data is subjected to data compression by high-efficiency encoding. However, high-efficiency encoding of digital image information data in accordance with MPEG is performed. When data compression is performed by data compression, it is possible to achieve an extremely high compression rate of data compression, and to provide a high quality image reproduced based on the data compressed digital image information data. The possible benefits are obtained. Therefore, in the field of business or home electronic equipment such as digital video cameras and digital video tape recorders, digital image information data (MPEG image information data) subjected to data compression by high-efficiency encoding according to MPEG. There is a tendency that the number of people who handle is increasing. In general, MPEG image information data forms 8-bit word string data.

The compressed digital video signal data such as the MPEG image information data and the compressed digital video and audio signal data obtained by adding the audio data to the compressed digital video signal data are transmitted as serial data through a transmission path. SDTI (Serial DataTra) has been developed as an interface
An nsport interface has been proposed.
This SDTI is based on SMPTE (Society of Motio)
n Picture and Television Engineers: “SMPTE 305M”.

The data format under the SDTI (SDTI data format) is, for example, as shown in FIG.
And as shown in FIG.

FIG. 13 shows one line period in the SDTI data format under the condition that the bit transmission rate at the time of serialization is 270 Mbps, and 10-bit word string data in which one word is composed of 10 bits. Has formed. And, for one line period,
For example, one frame period is formed by 525 line periods consisting of 525 lines.

In one line period shown in FIG. 13, timing reference code data: EAV (End of Acti
ve Video) and ancillary data (Ancillary Da
ta) and timing reference code data: SAV (Start
of Active Video) followed by a payload
(Payload) section follows. Each of the EAV and the SAV has the same word configuration, and is formed by sequentially arranging four words (3FF, 000,000,000,000, XYZ) each having a 10-bit configuration. The auxiliary data section includes header data. The payload is provided with user data and an error detection code: CRC.

FIG. 14 is a diagram showing an example of a case where the bit transmission rate when serialized is set to 143 Mbps.
This indicates one line period in the TI data format, and forms 10-bit word string data in which one word is composed of 10 bits. Then, one frame period is formed by, for example, 525 line periods formed by connecting 525 lines.

In one line period shown in FIG. 14, the timing reference code data starts with TRS-ID, followed by an auxiliary data (Ancillary Data) part, and further followed by a payload (Payload) part. TRS-
ID consists of 5 words (3F) each having a 10-bit configuration.
F, 000,000,000,000, XYZ) are sequentially arranged. The auxiliary data section includes header data. The payload is provided with user data and an error detection code: CRC.

A digital signal (SDTI signal) formed according to an SDTI data format used for transmitting compressed digital video signal data or video and audio signal data is also converted from parallel data to serial data, and is converted into an electrical signal or an electric signal. It is transmitted in the form of a transmission signal that is converted into an optical signal.

The D1 signal, D2 signal, SDT as described above
Regarding the transmission of a digital video signal such as an I signal and a 480P signal, the transmission side should add the word synchronization data to the data forming the digital video signal to be transmitted and perform 8B / 10B conversion before transmission. 8B based on data, including word sync data
/ 10B-converted word string data is formed, and the word string data is converted into serial data and transmitted by a transmission method.
For example, it is desired from the viewpoint that an existing integrated circuit element (IC element) or the like can be effectively used in configuring a transmission / reception circuit.

[0024]

As described above, the addition of the word synchronous data to the data forming the digital video signal to be transmitted and the 8B / 10B conversion are performed, and the word based on the data to be transmitted is used. A D1 signal, a D2 signal, an SDTI signal, and a 480P signal having a transmission method in which word string data including synchronous data and subjected to 8B / 10B conversion are formed, and the word string data is converted into serial data and transmitted. In the case where transmission of a digital video signal such as D1 signal, D2 signal, SDTI signal, 480P signal, etc. is to be transmitted, the digital video signal to be transmitted is required. If it is possible to properly determine the data that forms the signal and transmit properly at an appropriate transmission rate, D1 signal by the transmission system, D2 signal, SDTI signals, also can transmit any of the digital video signal such as a 480P signal, a very convenient, D1 signal, D2 signal, SDTI signals, 4
The use range of a digital video signal such as an 80P signal can be expanded. And D1 signal, D2 signal, SD
The expansion of the use range of digital video signals such as the TI signal and the 480P signal leads to further development of technology in the field of, for example, business or home electronic devices.

However, conventionally, the addition of word synchronization data to the data forming the digital video signal to be transmitted and the 8B / 10B conversion are performed to convert the word synchronization data based on the data to be transmitted. When transmitting a digital video signal by a transmission method in which word string data including and including 8B / 10B conversion is formed, and the word string data is converted into serial data and transmitted, the D1 signal, D2 signal, S
Regardless of which digital video signal such as a DTI signal or a 480P signal is to be transmitted, the data forming the digital video signal to be transmitted is accurately determined and an appropriate transmission speed is set. There is no concrete example that realizes a transmission system that can transmit properly. In this way, the D1 signal, D2 signal, SD
Neither can a document or the like describe a technique relating to a transmission system capable of appropriately transmitting data forming any of digital video signals such as a TI signal and a 480P signal at an appropriate transmission speed.

In view of the above, according to the invention described in the claims of the present application, word synchronization data is added to data forming a digital video signal to be transmitted, and 8B / 10B conversion is performed. 8B / 10B, including word sync data, based on the data to be done
When a digital video signal is transmitted using a transmission method in which converted word string data is formed and the word string data is converted into serial data and transmitted, a D1 signal, a D2 signal, an SDTI signal, a 480P signal, etc. Regardless of which digital video signal is to be transmitted, the data forming the digital video signal to be transmitted must be accurately identified and transmitted properly at an appropriate transmission speed. And a data transmission apparatus provided for implementing the method.

[0027]

According to a first aspect of the present invention, there is provided a data transmission method for determining a clock frequency of an input digital video signal. Then, a discrimination output signal corresponding to the discriminated clock frequency is obtained, a process of extracting a predetermined number of bits from the input digital video signal is performed to obtain first word string data based on the digital video signal, Transmission is performed by performing a process of inserting an additional word data group including word synchronization data having a preset code at a predetermined word interval in the first word string data in a manner corresponding to the discrimination output signal. A P / S which forms second word string data whose speed corresponds to the discrimination output signal and has 8B / 10B conversion means built-in Using the conversion means, performs 8B / 10B conversion on the second word string data into which the additional word data group for which the transmission speed is in accordance with the discrimination output signal is obtained, and obtains a preset value obtained based on the word synchronization data. Forming the third word string data including the part based on the additional word data group including the word synchronization data after the 8B / 10B conversion having the converted code, and converting the third word string data into serial data. , To transmit the serial data.

[0028] In particular, in the data transmission method according to the invention described in claim 2 of the present application, the process of inserting the additional word data group into the first word string data corresponds to the discrimination output signal. In this case, a predetermined word interval in the first word string data into which the additional word data group is to be inserted is selected according to the discrimination output signal.

Further, in particular, the data transmission method according to the invention described in claim 3 of the present application is as follows.
In performing the process of inserting the additional word data group into the first word string data in a manner corresponding to the determination output signal, the additional word data group is determined and output from a plurality of additional word data groups having different transmission speeds. It is to be selected as corresponding to the signal.

On the other hand, the data transmission apparatus according to any one of claims 6 to 8 in the claims of the present application determines the clock frequency of the input digital video signal, and A clock frequency discriminating means for obtaining a discrimination output signal corresponding to the inputted clock frequency, a process for extracting a predetermined number of bits from the input digital video signal to obtain first word string data based on the digital video signal, By performing a process of inserting an additional word data group including word synchronization data having a preset code at a predetermined word interval in the first word string data in a mode corresponding to the discrimination output signal, A compound word string data form forming second word string data whose transmission speed is in accordance with the discrimination output signal Means for performing an 8B / 10B conversion on the second word string data, and including an 8B / 10B converted word synchronization data having a preset code obtained based on the word synchronization data into an additional word data group. P / S with built-in 8B / 10B conversion means for forming third word string data having a portion based on the data and converting the third word string data into serial data
It is provided with a converting means, and a transmitting means for transmitting serial data obtained from the P / S converting means having a built-in 8B / 10B converting means.

In particular, in the data transmission apparatus according to the invention described in claim 7 of the present application, the compound word string data forming means inserts an additional word data group into the first word string data. Is performed in a manner corresponding to the discrimination output signal, a predetermined word interval in the first word string data into which the additional word data group is inserted is selected according to the discrimination output signal.

Further, in particular, the data transmission apparatus according to the invention described in claim 8 in the claims of the present application,
When the compound word string data forming means inserts the additional word data group into the first word string data in a manner corresponding to the discrimination output signal, the additional word data group is divided into a plurality of data streams having different transmission speeds. The additional word data group is configured to be selected as the one corresponding to the discrimination output signal.

[0033] As described above, the data transmission method according to any one of claims 1 to 5 in the claims of the present application, and claims 6 to 6 in the claims of the present application. In the data transmission apparatus according to the invention described in any one of the above items 8, the D1 signal, D1
The determination as to which of the two signals, the SDTI signal, the 480P signal, and the like is made is accurately performed by determining the clock frequency of the digital video signal, and a determination output signal corresponding to the determination result is obtained. And, for example, D
A process of inserting an additional word data group including word synchronization data into data forming a digital video signal which is any one of a 1 signal, a D2 signal, an SDTI signal, and a 480P signal corresponds to a discrimination output signal. The word string data including the word synchronization data is appropriately formed in such a manner that the word string data including the word synchronization data is formed, and the P / S conversion means including the 8B / 10B conversion means is used to form the word string including the word synchronization data. The data is subjected to 8B / 10B conversion to form composite word string data (third word string data) whose transmission speed is in accordance with the discrimination output signal, which is converted to serial data and transmitted. You.

The composite word string data formed in the P / S conversion means having the built-in 8B / 10B conversion means includes, for example, D1 signal, D2 signal, SDTI signal, 48
The input digital video signal, which is based on the input digital video signal, which is one of the 0P signal or the like, and the transmission speed thereof is determined according to the discrimination output signal, , D1 signal, D2 signal, SDTI signal, 480P signal, etc. The compound word string data whose transmission speed is suitable for the input digital video signal is
It is converted to serial data and sent out.
This means that word synchronization data having a preset code is included. The word synchronization data having such a preset code is, for example, + K28.5 which is the word data DS10 with RD being positive, or RD
Is -K28.5, which is the word data DS10 in which is negative.

In the composite word string data converted into serial data and transmitted as described above, word synchronous data having a predetermined code is converted into, for example, D1 signal, D2 signal, SDTI signal, and 480P at the receiving side. It is to be properly detected as word synchronization data required for processing for reproducing a digital video signal which is one of signals and the like. Also,
The word string data other than the word synchronization data included in the compound word string data converted into serial data and transmitted is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. become.
Therefore, on the receiving side, any one of, for example, a D1 signal, a D2 signal, an SDTI signal, a 480P signal, etc., based on the composite word string data received under the condition that good transmission quality is obtained. A state in which a data synchronization state required for processing for reproducing a digital video signal can be reliably obtained.

As described above, the data transmission method according to any one of the first to fifth aspects of the present invention, or the sixth to sixth aspects of the present invention, According to the data transmission apparatus according to the present invention, the addition of word synchronization data to the data to be transmitted and
B / 10B conversion is performed to form word string data including word synchronization data and subjected to 8B / 10B conversion based on data to be transmitted, and the word string data is converted to serial data and transmitted. When transmitting digital video signals using the transmission method
Regardless of which digital video signal such as D1 signal, D2 signal, SDTI signal, or 480P signal is to be transmitted, existing integrated circuit elements (IC elements)
With a configuration that can effectively utilize such data, the data forming the digital video signal to be transmitted is accurately determined, and the data is transmitted properly at an appropriate transmission speed while obtaining good transmission quality. You can do it.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a data transmission method according to the present invention described in any one of claims 1 to 5 of the present application. An example of a data transmission device according to the invention described in any one of claims 6 to 8 in the range of FIG.

In the example shown in FIG.
1 signal DVD1, D2 signal DVD2, SDTI signal DT
A digital video signal, which is an I or 480P signal DVP, is supplied to the compound word string data forming unit 11.

The data forming the D1 signal DVD1 is, for example, 10-bit word string data in the form of a data series as shown in FIG. 12, and has a word transmission rate of, for example, 27 MBps. And
Therefore, the frequency (clock frequency) of the word clock signal of the D1 signal DVD1 is, for example, 27 MHz.
The D2 signal DVD2 is 10-bit word string data in which the data forming the data has the same data sequence as the data forming the D1 signal DVD1, and the word transmission rate is, for example, 14.3 MBps. Therefore, the clock frequency of the D2 signal DVD2 is, for example, 14.3 MHz. The SDTI signal DTI is
The data forming it is, for example, as shown in FIG.
4 is a 10-bit word string data in the form of a data series as shown in FIG. 4, wherein the bit transmission rate is, for example, 270 Mbps or 143 Mbps. Frequency) is, for example, 27 MH
zs or 14.3 MHz. In addition, 480P
The signal DVP is composed of the D1 signal DV
This is 10-bit word string data having the same data sequence as the data forming D1, and has a word transmission rate of, for example, 54 MBps.
The clock frequency of the 480P signal DVP is, for example, 54
MHz.

Further, for example, the D1 signal DVD1 and the D2 signal DVD supplied to the compound word string data forming unit 11
2, a word clock signal CX of a digital video signal, which is one of the SDTI signal DTI and the 480P signal DVP, is supplied to the composite word string data forming unit 11 and the clock frequency determining unit 12, respectively. The clock frequency discrimination unit 12 receives the supplied word clock signal CX.
, And based on the detected frequency, the word clock signal CX is changed to the D1 signal DVD1 and the D2 signal D2.
It is determined which of VD2, SDTI signal DTI and 480P signal DVP.

That is, if the detected frequency is 27 MHz, the word clock signal CX is the D1 signal DVD1 or the SDT having the bit transmission rate of 270 Mbps.
13. the detected frequency is 14.
If the frequency is 3 MHz, the word clock signal CX is set to a D2 signal DVD2 or a bit transmission rate of 143 Mbps.
If the detected frequency is 54 MHz, the word clock signal CX
Is for the 480P signal DVP. Then, the clock frequency discriminating unit 12 generates a discrimination output signal SCD corresponding to the discrimination result, and supplies it to the compound word string data forming unit 11.

As a result of the discrimination in the clock frequency discriminating section 12, the word clock signal CX is the D1 signal DVD1 or the SDTI with the bit transmission rate of 270 Mbps.
In the case of the signal DTI, the discrimination output signal SCD
Indicates that the D1 signal DVD1
Or SD with a bit transmission rate of 270 Mbps
If the word clock signal CX is the D2 signal DVD2 or the SDTI signal DTI with a bit transmission rate of 143 Mbps, the discrimination output signal SCD indicates that the TI signal DTI is supplied. A D2 signal DVD2 or an SDTI signal DTI with a bit transmission rate of 143 Mbps
Is supplied, and when the word clock signal CX is that of the 480P signal DVP,
The discrimination output signal SCD is output to the compound word string data forming unit 11.
Indicates that the 480P signal DVP is supplied.

The compound word string data forming unit 11 has any one of the line period and the field period of the D1 signal DVD1, the D2 signal DVD2, the SDTI signal DTI and the 480P signal DVP supplied to the compound word string data forming unit 11. , A horizontal synchronizing signal SH and a vertical synchronizing signal SV, which are respectively synchronized.

Then, in the composite word string data forming section 11, the D1 signal DVD1, the D2 signal DVD2, the SD
The TI signal DTI or the 480P signal DVP is supplied to the 8-bit word string data formation / synchronization data insertion unit 13. The 8-bit word string data formation / synchronization data insertion unit 13 includes a horizontal synchronization signal SH, a vertical synchronization signal SV, a word clock signal CX, and a clock frequency determination unit 12.
Is also supplied.

The compound word string data forming unit 11 includes a word data transmitting unit 14 for transmitting the additional word data group DWA, a word data transmitting unit 15 for transmitting the additional word data group DWB, and an additional word data group DWC. Word data transmitting section 16 for transmitting
Is provided. These word data sending units 14,
The determination output signal SCD from the clock frequency determination unit 12 is supplied to each of 15 and 16.

Then, the discrimination output signal SCD is transmitted to the composite word string data forming section 11 by the D1 signal DVD1 or the SDTI signal DT having a bit transmission rate of 270 Mbps.
When I is supplied, the word data sending unit 14 sends the additional word data group DWA, and the discrimination output signal SCD outputs the D2 signal DVD2 or the D2 signal DVD2 to the composite word string data forming unit 11. SDTI signal DTI with bit transmission rate of 143 Mbps
Is supplied, the word data transmitting unit 15 transmits the additional word data group DWB, and the discrimination output signal SCD is supplied to the composite word string data forming unit 11 by the 480P signal DVP. When the word data sending unit 16 indicates that the additional word data group DWC is sent, the word data sending unit 16 sends the additional word data group DWC.
Additional word data groups DWA, DWB and DWC
Are a plurality of 8 bits each containing 8-bit word synchronization data.
Each word transmission rate is, for example, 54 MBps, 57.2 M, respectively.
It is 8-bit word string data of Bps and 108 MBps.

The additional word data group DWA sent from the word data sending section 14 and the word data sending section 1
5 or the additional word data group DWC sent from the word data sending unit 16 is passed through a data adding unit 17 to form an 8-bit word string data / synchronous data inserting unit 1.
3 is supplied.

The 8-bit word string data forming / synchronizing data inserting unit 13 uses the horizontal synchronizing signal SH, the vertical synchronizing signal SV, the discrimination output signal SCD from the clock frequency discriminating unit 12, and the word clock signal CX. ,
D1 signals DVD1 and D2 in which 10 bits that form each word as 10-bit word string data sequentially arrive.
For each of the signal DVD2, the SDTI signal DTI or the 480P signal DVP, for example, for each predetermined period corresponding to the discrimination output signal SCD based on the EAV, each bit data constituting the signal is sequentially 8 bits. It is taken out and 8-bit word data is sequentially formed. Then, 8-bit word string data DZ ′ (8) formed by connecting such 8-bit word data is obtained.

In this case, an 8-bit word string data is formed.
The synchronization data insertion unit 13 outputs the discrimination output signal SCD from the clock frequency discrimination unit 12 to the composite word string data formation unit 11 so that the D1 signal DVD1 or the bit transmission rate is 2
When it is indicated that the SDTI signal DTI at 70 Mbps is supplied, for example, for the supplied D1 signal DVD1 or the SDTI signal DTI at the bit transmission rate of 270 Mbps, for example, a 5-line period with the start point of the EAV as a reference point Each bit data constituting the data is sequentially extracted 8 bits by 8 minutes. Thereby,
For example, in A of FIG. 2, D / 0 to D / 7, D / 8 to D
/ 15, D / 16 to D / 23, D / 24 to D / 31,.
.. (D / 0,..., D / 31,... Represent each bit data) are sequentially formed as 8-bit word data. A process for making the formed 8-bit word data continuous is performed to obtain 8-bit word string data DZ '(8) having a word transmission rate of 54 MBps.

The 8-bit word string data forming / synchronizing data inserting section 13 outputs the discrimination output signal SCD from the clock frequency discriminating section 12 to the composite word string data forming section 11.
D2 signal DVD2 or bit transmission rate to 143
When the SDTI signal DTI at Mbps is supplied, the supplied D2 signal DVD2 or the SDTI signal D at the bit transmission rate of 143 Mbps is supplied.
For the TI, for example, 1
For each of the 0 line periods, each bit data constituting the line data is sequentially extracted by 8 bits. Thus, for example, FIG.
D / 0 to D / 7, D / 8 to D / 15, D /
.., 16-D / 23, D / 24-D / 31,... Are sequentially formed, and the formed 8-bit word data is connected continuously. To obtain 8-bit word string data DZ '(8) having a word transmission rate of 57.2 MBps.

Further, the 8-bit word string data forming / synchronizing data inserting section 13 outputs the discrimination output signal SCD from the clock frequency discriminating section 12 to the composite word string data forming section 1.
1 indicates that the 480P No. DVP is supplied, for example, with respect to the supplied 480P signal DVP,
Eight bits of each bit data constituting the EAV are sequentially extracted for every five line periods with the head of the EAV as a reference point. Thereby, for example, D / 0 to D in FIG.
/ 7, D / 8 to D / 15, D / 16 to D / 23, D / 2
4 to D / 31,..., Are sequentially formed, and the word transmission is performed by performing processing to make the formed 8-bit word data continuous. 8-bit word string data DZ '(8) having a rate of 108 MBps is obtained.

In addition to the above, the D1 signal DVD
1 or S with a bit transmission rate of 270 Mbps
8-bit word string data DZ '(8) obtained based on the DTI signal DTI, a D2 signal DVD2 or an SDTI signal DTI with a bit transmission rate of 143 Mbps
8-bit word string data DZ 'obtained based on
(8) Alternatively, with respect to the 8-bit word string data DZ ′ (8) obtained based on the 480P signal DVP, the word data transmitting units 14 and 1 are arranged at predetermined word intervals.
An additional word data group DWA, DWB or D containing 8-bit word synchronization data from 5 or 16
WC, so that additional word data groups DWA, DWB or DW as shown in FIG.
C, the composite 8-bit word string data DZ (8) having a word transmission rate of 54 MBps based on the D1 signal DVD1 or the SDTI signal DTI having the bit transmission rate of 270 Mbps, and the D2 signal DVD2 or the bit transmission rate of 143 Mbps. SDTI signal D
Compound 8-bit word string data DZ (8) with a word transmission rate based on TI of 57.2 MBps, or
The word transmission rate based on the 480P signal DVP is 108
Composite 8-bit word string data DZ (8) with MBps
To form Note that the arrow t in FIG. 2 indicates the passage of time.

FIG. 3 shows an example of a specific configuration of the 8-bit word string data forming / synchronizing data inserting unit 13. In the example shown in FIG. 3, the D1 signal DVD1 and the D2 signal DVD supplied to the compound word string data forming unit 11
2, SDTI signal DTI or 480P signal DVP
Is supplied to the switch 18. The switch 18 is also supplied with a control signal CSA from a switch control signal forming unit 19.

The switch control signal forming section 19 includes a horizontal synchronizing signal SH, a vertical synchronizing signal SV, and a word clock signal C.
X and the discrimination output signal SCD are supplied, and the switch control signal forming unit 19 outputs the horizontal synchronization signal SH and the vertical synchronization signal S
The control signal CSA and the control signal CSB are formed as follows in accordance with V, the word clock signal CX, and the discrimination output signal SCD.

First, the discrimination output signal SCD is transmitted to the composite word string data forming unit 11 by the D1 signal DVD1 or the SDTI signal DTI at a bit transmission rate of 270 Mbps.
Is supplied, the D1 signal DVD1 supplied to the switch 18 or the SDTI signal DTI at a bit transmission rate of 270 Mbps,
For example, a control signal CSA synchronized with the beginning of five line periods starting from the EAV and a control signal CSB synchronized with a period that is an integral multiple of the period of the word clock signal CX are formed. When the discrimination output signal SCD indicates that the D2 signal DVD2 or the SDTI signal DTI having the bit transmission rate of 143 Mbps is supplied to the composite word string data forming unit 11, the D2 signal supplied to the switch 18 is supplied. For example, in the DVD2 or the SDTI signal DTI having the bit transmission rate of 143 Mbps, for example, the control signal CSA synchronized with the beginning of 10 line periods starting from EAV and the period synchronized with an integral multiple of the period of the word clock signal CX. Form a control signal CSB. Further, when the discrimination output signal SCD indicates that the 480P signal DVP is supplied to the composite word string data forming unit 11, the signal supplied to the switch 18 is
For example, in the 80P signal DVP, for example, the control signal CS synchronized with the beginning of five line periods starting from EAV
A and a control signal CSB synchronized with a period that is an integral multiple of the period of the word clock signal CX.

The memory section 20 and the memory section 21 are connected to the switch 18. Then, the switch 18 responds to the control signal CSA by outputting the D1 signal DVD1 or the SDTI signal DT having the bit transmission rate of 270 Mbps.
For example, in the case of I, for example, switching at the beginning of each of five line periods starting from EAV, the D2 signal DVD2 or the SDTI signal D with the bit transmission rate of 143 Mbps.
For example, switching at the beginning of each 10-line period starting from EAV in TI or switching at the beginning of each 5-line period starting from EAV in the 480P signal DVP is performed.

Thus, the D1 signal DVD1 or the SDTI signal D1 having a bit transmission rate of 270 Mbps
The TI is alternately supplied to the memory unit 20 and the memory unit 21 for five line periods starting from the EAV, and the memory unit 20 and the memory unit 21 for the D1 signal DVD1 or the SDTI signal DTI with the bit transmission rate of 270 Mbps. And the D2 signal DVD2 or the bit transmission rate is set to 143 Mbps.
SDTI signal DTI is 1 starting from the EAV.
The supply of the D2 signal DVD2 or the SDTI signal DTI having the bit transmission rate of 143 Mbps to the memory unit 20 and the memory unit 21 is alternately supplied to the memory unit 20 and the memory unit 21 for every 0 line period. Or the 480P signal DVP is alternately supplied to the memory unit 20 and the memory unit 21 every five line periods starting from the EAV.
Is placed in a state in which the distribution supply to the memory unit 20 and the memory unit 21 is performed.

In connection with the memory units 20 and 21,
A memory control signal forming unit 22 is provided, and the word clock signal CX is supplied to the memory control signal forming unit 22. Then, based on the word clock signal CX, the memory control signal forming unit 22 sets a write control signal QW having a frequency of 27 MHz and a frequency of 27 MHz × 2 = 54 M
(A D1 signal DVD1 or an SDTI signal D having a bit transmission rate of 270 Mbps)
When TI is supplied), the write control signal QW whose frequency is 14.3 MHz and the frequency is 14.3 MHz × 4 = 5
A state in which a read control signal QR of 7.2 MHz is generated (SDT of D2 signal DVD2 or bit transmission rate of 143 Mbps in the composite word string data forming unit 11)
I signal DTI is supplied) or a write control signal QW having a frequency of 54 MHz and a frequency of 54 MHz
A state in which a read control signal QR with z × 2 = 108 MHz is generated (when the 480P signal DVP is supplied to the composite word string data forming unit 11), and the write control signal QW
And the read control signal QR are supplied to both the memory units 20 and 21.

Thus, in the memory section 20, when the D1 signal DVD1 or the SDTI signal DTI having the bit transmission rate of 270 Mbps is supplied to the compound word string data forming section 11, the D1 signal is transmitted through the switch 18.
Signal DVD1 or bit transmission rate of 270 Mbp
s, the D1 signal DVD1 or the bit transmission rate is set to 27.
A 5-line period starting from the EAV of the SDTI signal DTI at 0 Mbps has a word transmission rate of 27 MBps according to the write control signal QW having a frequency of 27 MHz.
It is written in the state as follows. Further, even in the memory unit 21, the D1 signal DVD is
1 or S with a bit transmission rate of 270 Mbps
When the DTI signal DTI is supplied, the D1 signal DVD1 or the bit transmission rate is set to 27 through the switch 18.
In the period in which the SDTI signal DTI at 0 Mbps is supplied, five line periods starting from the EAV of the D1 signal DVD1 or the SDTI signal DTI at the bit transmission rate of 270 Mbps correspond to the write control signal QW at the frequency of 27 MHz. , Word transmission rate 27M
It is written in the state of Bps.

Accordingly, the D1 signal DVD1 or the bit transmission rate is set to 270 M
When the SDTI signal DTI at bps is supplied, the D1 signal DVD1 in the memory units 20 and 21 or the SDTI at the bit transmission rate of 270 Mbps
Writing at a word transmission rate of 27 MBps for the five line periods starting from the EAV of the I signal DTI is performed at the beginning of the five line period starting from the EAV of the DTI signal DVD1 or the SDTI signal DTI at the bit transmission rate of 270 Mbps. Are performed alternately according to the switching of the switch 18 performed at each time point.

In this case, the EA of the D1 signal DVD1 or the SDTI signal DTI with the bit transmission rate of 270 Mbps written in the memory units 20 and 21 respectively.
The data amount for five line periods starting from V is, for example, 5
(Line) × 858 (sample / line) × 20 (bit / sample) = 85,800 bits.

In the memory section 20, the D2 signal DVD2 or the SDTI signal DT having a bit transmission rate of 143 Mbps is transmitted to the compound word string data forming section 11.
If I is supplied, the D2 signal D
During the period in which the VD2 or the SDTI signal DTI with the bit transmission rate of 143 Mbps is supplied, D2
Signal DVD2 or bit transmission rate of 143Mbp
The 10-line period starting from the EAV of the SDTI signal DTI as s corresponds to the word transmission rate of 14.3 MBp according to the write control signal QW having the frequency of 14.3 MHz.
s is written. Further, even in the memory unit 21, the D2 signal DV is transmitted to the compound word string data forming unit 11.
When the SD2 signal DTI having the D2 or bit transmission rate of 143 Mbps is supplied, the D2 signal DVD2 or the bit transmission rate is set to 1 through the switch 18.
During the period in which the SDTI signal DTI at 43 Mbps is supplied, the EAV of the D2 signal DVD2 or the SDTI signal DTI at a bit transmission rate of 143 Mbps.
, The frequency of 14.3 MH
Writing is performed in a state where the word transmission rate is 14.3 MBps according to the write control signal QW as z.

Accordingly, the D2 signal DVD2 or the bit transmission rate is set to 143M
When the SDTI signal DTI at bps is supplied, the DDT signal DVD2 in the memory units 20 and 21 or the SDT at the bit transmission rate of 143 Mbps
Writing in a state where the word transmission rate is 14.3 MBps for 10 line periods starting from the EAV of the I signal DTI is performed by the D2 signal DVD2 or the EA of the SDTI signal DTI having the bit transmission rate of 143 MBps.
The switching is performed alternately in accordance with the switching of the switch 18 performed at the beginning of the 10-line period starting from V.

At this time, the EA of the DTI signal DTI written in each of the memory units 20 and 21 or the SDTI signal DTI with a bit transmission rate of 143 Mbps is used.
The data amount for 10 line periods starting from V is, for example,
10 (line) x 910 (sample / line) x 10
(Bits / sample) = 91,000 bits.

Further, in the memory section 20, when the 480P signal DVP is supplied to the compound word string data forming section 11, the EAV of the 480P signal DVP is supplied during the period in which the 480P signal DVP is supplied through the switch 18.
The word transmission rate is set to 54 in accordance with the write control signal QW having a frequency of 54 MHz.
It is written in the state of MBps. Also, the memory unit 2
1, even if it is 480,
When the P signal DVP is supplied, during the period in which the 480 P signal DVP is supplied through the switch 18,
Five line periods starting from EAV of the P signal DVP are written in a state where the word transmission rate is 54 MBps according to the write control signal QW having a frequency of 54 MHz.

Therefore, when the 480P signal DVP is supplied to the composite word string data forming unit 11, the memory unit 2
The word transmission rate for the five line periods starting from the EAV of the 480P signal DVP at 0 and 21 is 54
Write in the state of MBps is performed by 480P signal DVP
Are performed alternately according to the switching of the switch 18 performed at the beginning of each of the five line periods starting from the EAV.

At this time, the data amount of the 480P signal DVP written in each of the memory units 20 and 21 for five line periods starting from the EAV is, for example, 5 (lines) ×
858 (samples / line) × 20 (bits / sample) = 85,800 bits.

D1 signal DV written in memory unit 20
The D1 or SDTI signal DTI with a bit transmission rate of 270 Mbps is read out from the D1 signal DVD1 or the SDTI signal DTI with a bit transmission rate of 270 Mbps following the writing period in a 5-line period starting from EAV with a frequency of 54 MHz. Control signal Q
In accordance with R, 8-bit words are read from the memory unit 20 in units of 8 bits to sequentially form 8-bit words. Also, a D2 signal DVD2 written in the memory unit 20 or an SDTI having a bit transmission rate of 143 Mbps.
The signal DTI is a D2 signal DVD2 following the writing period.
Or SD with a bit transmission rate of 143 Mbps
Read control signal QR having a frequency of 57.2 MHz within 10 line periods starting from EAV of TI signal DTI
Are read out from the memory unit 20 in units of 8 bits to sequentially form 8-bit words. Further, the 480P signal DVP written in the memory unit 20
Is the EAV of the 480P signal DVP following the writing period.
The frequency is set to 108 MH
In accordance with the read control signal QR as z, 8 bits are read from the memory unit 20 in units of 8 bits to sequentially form 8-bit words.

As a result, the word transmission rate is set to 54 MBps, 57.2 MBps or 10
The 8-bit word string data DZ ′ (8) having 8 MBps is obtained and supplied to the switch 23.

Similarly, the D1 signal DVD1 written in the memory unit 21 or the bit transmission rate is set to 270M.
bps, the DTI signal DVD1 following the writing period or the bit transmission rate is set to 27 bits.
In a 5-line period starting from the EAV of the SDTI signal DTI at 0 Mbps, an 8-bit word is sequentially read out from the memory unit 21 in accordance with a read control signal QR having a frequency of 54 MHz. It is said. The D2 signal D written in the memory unit 21
The SDTI signal DTI whose VD2 or bit transmission rate is 143 Mbps is the D2 signal DVD2 or the bit transmission rate of 143 Mbps following the writing period.
In a 10-line period starting from the EAV of the SDTI signal DTI, the memory unit 21 reads out 8 bits at a time in accordance with a read control signal QR having a frequency of 57.2 MHz to sequentially form 8-bit words. It is assumed. Further, the 480P signal DVP written in the memory unit 21 has a frequency of 10 in a 5-line period starting from the EAV of the 480P signal DVP following the writing period.
In response to the read control signal QR of 8 MHz, the memory unit 2
One to eight bits are read out one by one to sequentially form eight-bit words.

As a result, the word transmission rate is set to 54 MBps, 57.2 MBps or 10
The 8-bit word string data DZ ′ (8) having 8 MBps is obtained and supplied to the switch 23.

In addition to the 8-bit word string data DZ '(8), the switch 23 controls the D1 signal DVD1 or the bit transmission rate from each of the memory units 20 and 21 to 270M.
When the 8-bit word string data DZ ′ (8) is obtained by reading the SDTI signal DTI at bps, the additional word data group DWA with a word transmission rate of 54 MBps from the word data transmitting unit 14 D2 signal DVD2 or SDTI signal D with bit transmission rate of 143 Mbps from each of sections 20 and 21
When the TI is read and 8-bit word string data DZ ′ (8) is obtained, an additional word data group DWB with a word transmission rate of 57.2 MBps from the word data transmission unit 15 is further added to the memory unit 20 and When the 480P signal DVP is read out from each of the N.21 and the 8-bit word string data DZ '(8) is obtained, an additional word data group DWC with a word transmission rate of 108 MBps is supplied from the word data transmission unit 16. .

The switch 23 responds to the control signal CSB from the switch control signal forming section 19 by sending the 8-bit word string data DZ '(8) from the memory section 20 and the additional word data from the word data transmitting section 14. Group DWA,
The additional word data group DWB from the word data transmission unit 15 or the additional word data group DWC from the word data transmission unit 16, the 8-bit word string data DZ '(8) from the memory unit 21, and the word data transmission unit 14 , The additional word data group DWA from the word data sending unit 15
Alternatively, the operation of sequentially extracting the additional word data group DWC from the word data transmission unit 16 is repeated. As a result, the word transmission rate is set to 54M from the switch 23.
The word transmission rate is set to 54 MBps at a predetermined word interval in 8-bit word string data DZ '(8) having
A predetermined word interval is added to the composite 8-bit word string data DZ (8) formed by inserting the additional word data group DWA, and the 8-bit word string data DZ ′ (8) having a word transmission rate of 57.2 MBps. , And compound 8-bit word string data DZ (8) formed by inserting an additional word data group DWB having a word transmission rate of 57.2 MBps, or 8-bit word string data DZ having a word transmission rate of 108 MBps '
(8), an additional word data group DWC having a word transmission rate of 108 MBps at a predetermined word interval.
8 bit word string data D formed by inserting
Z (8) is obtained.

Thus, the composite 8-bit word string data DZ (8) obtained from the switch 23 has a word transmission rate of 54 MBps, 57.2 MBps and 108 MBps.
MBps, which is derived from the 8-bit word string data formation / synchronization data insertion unit 13 and output from the composite word string data formation unit 11 is 8B /
It is supplied to the P / S converter 25 with a built-in 10B converter. Such word transmission rates of 54 MBps, 57.2 MBps and 108 MBps correspond to the transmission of the SD1 signal DTI with the D1 signal DVD1 or the bit transmission rate of 270 Mbps, the transmission of the SDTI signal DTI with the D2 signal DVD2 or the bit transmission rate of 143 Mbps, respectively. And a transmission rate selected as suitable for transmission of the 480P signal DVP.

An additional word data group DWA with a word transmission rate of 54 MBps from the word data transmission section 14, an additional word data group DWB with a word transmission rate of 57.2 MBps from the word data transmission section 15, and word data transmission Each of the additional word data groups DWC having a word transmission rate of 108 MBps from the unit 16 is configured as 8-bit word string data. As an example, 8-bit word synchronization data DEK8 is arranged at the head, and a plurality of Are arranged in series.

The 8-bit word synchronization data DEK8 is 1
When converted to 0-bit word data, it is 8-bit word data which is the above-described word data DS10. Therefore, when the 8-bit word synchronous data DEK8 is converted into 10-bit word data, it is called with a code name of K28.5, and the CRD, which is the RD of the word data disposed immediately before, is negative (-). When
+ K28.5, and when the CRD, which is the RD based on the word data arranged immediately before, is positive (+),
-K28.5. Further, the arbitrary 8-bit word data DEX8 is converted into 10-bit word data DXX.X when the 8B / 10B conversion is performed.

The additional word data group DWA from the word data transmitting section 14 is stored in the memory sections 20 and 2
1 to D1 signal DVD1 or bit transmission rate 2
The SDTI signal DTI at 70 Mbps is inserted into the 8-bit word string data DZ '(8) obtained by reading, and the EA of the DTI signal DVD1 or the SDTI signal DTI at a bit transmission rate of 270 Mbps
The time T (s) for five line periods starting from V is T = 8
Since 5,800 (bits) / 270 (Mbps), the total number of bits is BX, BX is represented by the following equation:
Equation 1 is satisfied.

[0078]

(1) (85,800 (bit) + BX (bit))
/ T (s) = 54 (MBps) × 10 (bits) × 8 /
10

Therefore, BX = 51,480 bits. That is, the word data sending unit 14 is composed of 51,4
An additional word data group DWA formed by 80 bits (6,435 words) is transmitted.

The additional word data group DWB from the word data transmitting unit 15 is stored in the memory units 20 and 21.
D2 signal DVD2 or bit transmission rate from 14
The SDTI signal DTI at 3 Mbps will be inserted into the 8-bit word string data DZ '(8) obtained by reading, and the EAV of the D2 signal DVD2 or the SDTI signal DTI at a bit transmission rate of 143 Mbps.
The time T (s) for 10 line periods starting from is T = 9
Since it is 1,000 (bits) / 143 (Mbps), if the total number of bits is BX, BX is represented by the following equation:
Equation 2 is satisfied.

[0081]

## EQU2 ## (91,000 (bits) + BX (bits))
/T(s)=57.2 (MBps) × 10 (bits) ×
8/10

Therefore, BX = 200, 200 bits. That is, the word data transmission unit 15 is 200,
The additional word data group DWB formed by 200 bits (25,025 words) is transmitted.

Further, the additional word data group DWC from the word data transmitting section 16 is stored in the memory sections 20 and 2
1 to 480P signal DVP will be inserted into the 8-bit word string data DZ '(8) obtained by reading. The time T (s) of the 480P signal DVP for five line periods starting from the EAV is: T = 85,800 (bits) /
540 (Mbps), so the total number of bits is BX
Then, BX satisfies the following equation:

[0084]

## EQU3 ## (85,800 (bit) + BX (bit))
/ T (s) = 108 (MBps) × 10 (bits) × 8
/ 10

Therefore, BX = 51,480 bits. That is, the word data transmitting section 16 is composed of 51,4
An additional word data group DWC formed by 80 bits (6,435 words) is transmitted.

The additional word data group DW
The composite 8-bit word string data DZ (8) formed by inserting A, DWB or DWC has a portion where the additional word data group DWA, DWB or DWC is inserted as shown in FIG. 4A. Is done. In FIG. 4A, DV8 is 8-bit word string data D obtained from each of the memory units 20 and 21 shown in FIG.
Each of the 8-bit word data forming Z '(8) is represented, and is converted into 10-bit word data DV10 by 8B / 10B conversion.

Further, an additional word data group DWA with a word transmission rate of 54 MBps from the word data transmitting section 14, an additional word data group DWB with a word transmission rate of 57.2 MBps from the word data transmitting section 15, and a word As another example, each of the additional word data groups DWC whose word transmission rate from the data transmission unit 16 is 108 MBps is provided with 8-bit word synchronization data DEK8 at the beginning, and a plurality of arbitrary 8-bit word data DEX8. The 8-bit word synchronizing data DEK8 and an arbitrary 8-bit word data DEX8 are successively connected to each other.

Also in such a case, the word data transmitting section 14 outputs an additional word data group DW formed of 51,480 bits (6,435 words) as a whole.
A, and the word data transmission unit 15
An additional word data group DWB formed of 0,200 bits (25,025 words) is transmitted, and the word data transmission section 16 outputs an additional word data group formed entirely of 51,480 bits (6,435 words). Send DWC.

The additional word data group DWA,
In the composite 8-bit word string data DZ (8) formed by inserting DWB or DWC, the portion where the additional word data group DWA, DWB or DWC is inserted is as shown in FIG. 5A. . DEK8, DEX8 and DV8 shown in FIG. 5A are the same as DEK8, DEX8 and DV8 shown in FIG. 4A.

The composite 8-bit word string data DZ (8) from the composite word string data forming unit 11 is supplied with 8B /
For the P / S converter 25 with a built-in 10B converter,
Eight bits forming each word in the bit word string data DZ (8) are partitioned, and each of the partitioned eight bits is divided according to a conversion table prepared in advance.
An 8B / 10B conversion that sequentially converts the data into 10-bit data is performed to form composite 10-bit word string data DZ (10) based on the composite 8-bit word string data DZ (8). As a result, the built-in 8B / 10B converter P / S
In the conversion unit 25, the word transmission rate is set to 54 MBps.
The composite 10-bit word string data DZ (10)
D1 signal DVD1 or bit transmission rate of 270M
bps, based on the SDTI signal DTI,
The composite 10-bit word string data DZ (10) having a word transmission rate of 57.2 MBps is a D2 signal DVD2
Or SD with a bit transmission rate of 143 Mbps
The composite 10-bit word string data DZ (10) having the word transmission rate of 108 MBps is formed based on the TI signal DTI or based on the 480P signal DVP.

At this time, the 8-bit word synchronization data DEK
8 is converted to K28.5, and arbitrary 8-bit word data DEX8 is converted to 10-bit word data DXX.
Converted to X. Therefore, additional word data group D inserted into composite 8-bit word string data DZ (8)
When WA, DWB or DWC is as shown in FIG. 4A, the composite 10-bit word string data D
In Z (10), the portion based on the additional word data group DWA, DWB or DWC is as shown in FIG. 4B, and one K28.5 is included. Further, the additional word data group DW inserted into the composite 8-bit word string data DZ (8)
When A, DWB or DWC is as shown in FIG. 5A, the composite 10-bit word string data DZ
(10) is the additional word data group D in that
The part based on WA, DWB or DWC is shown in FIG.
And two K28.5 will be included.

In addition to the above, a P with a built-in 8B / 10B converter
In the / S conversion unit 25, the word transmission rate obtained by the 8B / 10B conversion of the composite 8-bit word string data DZ (8) is 54 MBps, 57.2 MBp.
s or 108 MBps, the composite 10-bit word string data DZ (10) is subjected to P / S conversion for converting parallel data into serial data, and the bit transmission rate based on the composite 10-bit word string data DZ (10) is adjusted. 54 MBps × 10 = 0.54 Gbps, 57.2 M
Bps × 10 = 0.572 Gbps or 108 MB
Serial data D with ps × 10 = 1.08 Gbps
ZS, and transmits the serial data DZS to the transmitting unit 26.
To supply.

The transmitting section 26 converts the serial data DZS into
For example, in order to transmit through a data transmission line formed using a coaxial cable or an optical fiber, an electric signal suitable for the data transmission line formed using a coaxial cable or an optical fiber is used. It is transmitted as a transmission signal SZ which is an optical signal or the like suitable for the formed data transmission path. Thereby, transmission of the serial data DZS is performed.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S converter 2 with a built-in 8B / 10B converter is used.
5 and the transmission unit 26 set the word transmission rate to 54 MBp
s, the composite 10-bit word string data DZ (10) having 57.2 MBps or 108 MBps is converted into serial data DZS having a bit transmission rate of 0.54 Gbps, 0.572 Gbps or 1.08 Gbps and transmitted. So, such 8B / 10
The P / S converter 25 with a built-in B-converter and the transmitter 26 are effectively used by, for example, an integrated circuit device (IC device) provided for transmitting a digital video signal under a fiber channel system. Can be configured. Therefore, the word synchronization data is added to the data to be transmitted and the 8B / 10B conversion is performed, and the word string data including the word synchronization data and subjected to the 8B / 10B conversion is formed based on the data to be transmitted. When a digital video signal is transmitted using a transmission scheme in which the word string data is converted into serial data and transmitted, for example, a D1 signal, a D2 signal, an SD
Regardless of which digital video signal, such as a TI signal or a 480P signal, is to be transmitted, data forming the digital video signal to be transmitted is accurately determined, and the data is transmitted in good condition. Under the condition that the quality is obtained, it is possible to perform transmission at an appropriate transmission rate using a means that can be arranged appropriately and relatively easily.

FIG. 6 shows an example of the data transmission method according to the invention described in the claims of the present application, which is transmitted from the transmission unit 26 in the data transmission apparatus shown in FIG.
Transmission signal SZ based on serial data DZS obtained by converting composite 10-bit word string data DZ (10)
1 shows an example of a data receiving device that receives a message.

In the example of the data receiving apparatus shown in FIG. 6, for example, a data transmission line formed using a coaxial cable or a data transmission line formed using an optical fiber is used. A receiving unit 30 that receives the transmitted transmission signal SZ is provided. When receiving the transmission signal SZ, the receiving unit 30 sets the bit transmission rate based on the received transmission signal SZ to 0.5.
4 Gbps, 0.572 Gbps or 1.08 Gbps
ps serial data DZS is reproduced, and the reproduced serial data DZS is subjected to synchronous data detection, S / P conversion,
It is supplied to the 10B / 8B converter 31.

Synchronous data detection, S / P conversion, 10B / 8
In the B conversion unit 31, the supplied bit transmission rate is set to 0.54 Gbps, 0.572 Gbps or 1.
1 in serial data DZS of 08 Gbps
A portion where K28.5 which is 0-bit word synchronous data is converted into serial data is detected as synchronous data,
S / P conversion is performed on the serial data DZS with word synchronization based on the detected synchronization data to obtain parallel data based on the serial data DZS.

At this time, synchronous data detection, S / P conversion, 1
In the 0B / 8B converter 31, when the serial data DZS is supplied from the receiver 30, the built-in operation controller performs, for example, the control shown in the flowchart of FIG. Is set to 0.54 Gbps, 0.572 Gbps or 1.08 Gbps.

In the control shown by the flowchart shown in FIG. 7, after the start, first, in step 3
5, a 1.08 Gbps reception mode, which is an operation state in which serial data DZS having a bit transmission rate of 1.08 Gbps can be properly received, is set;
In the following step 36, the mode flag FA is set to "1", and both the mode flag FB and the mode flag FC are set to "0".

Next, in step 37, it is determined whether or not parallel data based on the serial data DZS has been obtained as an output signal, that is, whether or not there is a parallel data output. As a result, when there is no parallel data output, the determination in step 37 is repeated.

If the result of determination in step 37 is that there is parallel data output, step 38
In the built-in phase locked loop (PL
It is determined whether or not L) is locked. As a result, if the PLL is in the locked state, the process returns to step 37 to repeatedly determine whether or not there is a parallel data output.

Also, as a result of the judgment in step 38, the PL
If L is not locked, step 39
In, it is determined whether or not the mode flag FA is “1”. As a result, when the mode flag FA is “1”, in step 40, the operation state is 0.572 G in which the serial data DZS having the bit transmission rate of 0.572 Gbps can be properly received.
In step 41, the mode flag FB is set to “1”.
Both the mode flag FA and the mode flag FC are set to "0", and the process returns to step 38, where
Repeat the following steps.

On the other hand, if the result of determination in step 39 is that mode flag FA is not "1", step 42
In, it is determined whether or not the mode flag FB is “1”. As a result, when the mode flag FB is “1”, in step 43, the operation state is such that the serial data DZS having the bit transmission rate of 0.54 Gbps can be properly received.
s The reception mode is set, and in step 44, the mode flag FC is set to "1", and both the mode flag FA and the mode flag FB are set to "0". Repeat the above steps.

If the result of determination in step 42 is that mode flag FB is not "1", step 3
Returning to step 5, the steps after step 35 are repeated.

Thus, the bit transmission rate is set to 0.
54Gbps, 0.572Gbps or 1.08G
In the synchronous data detection / S / P converter 31 which takes a reception state for the serial data DZS at bps, the reception state for the serial data DZS at a bit transmission rate of 0.54 Gbps is taken.
When the serial data DZS whose bit transmission rate from 0 is 0.54 Gbps is properly received, the word transmission rate based on the serial data DZS is 54M.
The composite 10-bit word string data DZ (10), which is parallel data of Bps, is formed. The serial data DZ having a bit transmission rate of 0.572 Gbps
When the reception state for S is taken and the serial data DZS with the bit transmission rate of 0.572 Gbps from the receiving unit 30 is properly received, the word transmission rate based on the serial data DZS is 57.2 Mbps.
The composite 10-bit word string data DZ (10), which is parallel data, is formed. Further, a reception state is set for the serial data DZS having a bit transmission rate of 1.08 Gbps, and the serial data DZS having a bit transmission rate of 1.08 Gbps from the receiving section 30 is set.
Is properly received, composite 10-bit word string data DZ which is parallel data with a word transmission rate of 108 MBps based on the serial data DZS
Form (10).

Synchronous data detection, S / P conversion, 10B / 8
The word transmission rate obtained by the B conversion unit 31 is 5
4MBps, 57.2MBps or 108MBps
The composite 10-bit word string data DZ (10)
Additional word data group DWA, DWB or DW
C, and compound 10-bit word string data DZ
Additional word data group DWA, D in (10)
The portion including WB or DWC is, for example, as shown in FIG. 8A or FIG. 9A according to the contents of the additional word data group DWA, DWB or DWC.

Synchronous data detection, S / P conversion, 10
In the B / 8B conversion unit 31, each of the 10 bits forming each word in the composite 10-bit word string data DZ (10) is divided, and each of the divided 10 bits is converted into a conversion table prepared in advance. Is subjected to 10B / 8B conversion which sequentially converts the data into 8-bit data according to the following formula, and the word transmission rate based on the composite 10-bit word string data DZ (10) is 54 MBps, 57.2 MBp.
The composite 8-bit word string data DZ (8) of s or 108 MBps is reproduced. Then, the composite 8-bit word string data DZ (8) having a word transmission rate of 54 MBps, 57.2 MBps or 108 MBps obtained from the synchronous data detection / S / P conversion / 10B / 8B conversion unit 31 is divided into 10 words. The data is supplied to the bit word string data forming unit 32.

In addition to the above, in the synchronous data detection / S / P conversion / 10B / 8B conversion section 31, the word transmission rate is set to 54 MBps, 57.2 MBps or 108 MBps.
Composite 10-bit word string data DZ (1
0) additional word data groups DWA, DWB
Alternatively, K28.5 in DWC is detected and K28.5 is detected.
The detection output signal SWS is transmitted. This K28.5 detection output signal SWS is a composite 10-bit word string data DZ
Additional word data group DWA, D in (10)
According to the content of WB or DWC, for example, B in FIG.
Alternatively, it is obtained as shown in FIG.

In this manner, synchronous data detection / S / P
K28.5 obtained from conversion / 10B / 8B conversion section 31
The detection output signal SWS is supplied to the control signal forming unit 33. In the control signal forming section 33, a synchronization control signal CW based on the K28.5 detection output signal SWS is formed.

Further, synchronous data detection, S / P conversion, 1
In the 0B / 8B converter 31, the word transmission rate is set to 54 MBps, 57.2 MBps or 108 MBp.
The word clock signal CXR for the composite 8-bit word string data DZ (8) as s is taken out and supplied to the data discrimination unit 34. Word clock signal CXR
Is a frequency corresponding to the word transmission rate of the composite 8-bit word string data DZ (8), that is, 54 MHz, 57.2.
MHz or 108 MHz. Therefore, depending on the frequency, the word clock signal CXR indicates that the composite 8-bit word string data DZ (8) has the D1 signal DVD1 or the bit transmission rate of 270 Mbps.
Or the D2 signal D2
VD2 or an SDTI signal with a bit transmission rate of 143 Mbps, or 48
This indicates whether the signal is based on the 0P signal DVP.

The data discriminating section 34 discriminates the frequency of the word clock signal CXR and sends out a discrimination signal CD representing the discrimination result. The discrimination signal CD is obtained by synthesizing the composite 8-bit word string data DZ (8) obtained from the synchronous data detection / S / P conversion / 10B / 8B conversion unit 31 with the D1 signal DVD1 or the bit transmission rate of 270 Mbps.
The DTI signal DVD2 or the SDTI signal with a bit transmission rate of 143 Mbps, or
480P signal DVP.

Synchronous data detection, S / P conversion, 10B / 8
When the word transmission rate from the B conversion unit 31 is 54 MBps,
Composite 8 with 57.2 MBps or 108 MBps
The word data separation / 10-bit word string data forming unit 32 to which the bit word string data DZ (8) is supplied includes:
The synchronization control signal CW from the control signal formation unit 33, the word clock signal CXR from the synchronization data detection / S / P conversion / 10B / 8B conversion unit 31, and the discrimination signal CD from the data discrimination unit 34 are also supplied. Then, in the word data separation / 10-bit word string data forming unit 32,
Under the synchronous control by the synchronous control signal CW, the word transmission rate is set to 54 MBps, 57.2 MBps or 10 based on the composite 8-bit word string data DZ (8).
8-bit word string data DZ '(8) with 8 MBps
And additional word data group DWA, DWB or D
The 8-bit word string data forming WC is separated and taken out.

Further, in the word data separation / 10-bit word string data forming section 32, the 8-bit word string data DZ '(8) extracted from the composite 8-bit word string data DZ (8) is Clock signal CX
And processing using the discrimination signal CD. Each bit data of the 8-bit word string data DZ '(8) is
By sequentially taking out 10 bits at a time based on
0-bit word data is sequentially formed, whereby the 10-bit word data is formed in succession, and the D1 signal DVD1 or the bit transmission rate is 270 Mbps, which is 10-bit word string data having a word transmission rate of 27 MBps. SDTI signal DT
I, D2 signal DVD2 with word transmission rate of 14.3 MBps or bit transmission rate of 143 Mbps
SDTI signal D which is 10-bit word string data
TI or 480P signal DVP which is 10-bit word string data with a word transmission rate of 54 MBps
Get.

At this time, the 8-bit word string data DZ '
In order to sequentially form 10-bit word data by sequentially extracting each bit data of (8) by 10 bits on the basis of EAV, the discrimination signal CD includes
Bit word string data DZ (8) is D1 signal DVD1 or SDT with bit transmission rate of 270 Mbps
When indicating that the signal is based on the I signal DTI,
Therefore, the 8-bit word string data DZ '(8) is
Signal DVD1 or bit transmission rate of 270 Mbp
s, the 8-bit word string data DZ ′ (8) is converted into, for example,
The frequency is set to 54 in the memory means for each of the five line periods.
In addition to writing data in accordance with a write control signal having a frequency of 54 MHz formed on the basis of the word clock signal CXR having a frequency of 5 MHz, five lines of 8-bit word string data DZ '(8) written in the memory means are stored in the memory. Means that the frequency formed based on the word clock signal CXR having a frequency of 54 MHz is 54 MHz / 2 = 2
According to a read control signal of 7 MHz, a process of reading 10 bits at a time is performed.
Or SD with a bit transmission rate of 270 Mbps
The TI signal DTI is reproduced.

The discrimination signal CD is the composite 8-bit word string data DZ (8) is the D2 signal DVD2 or the SDTI signal DT whose bit transmission rate is 143 Mbps.
I to indicate that it is based on
The bit word string data DZ '(8) is a D2 signal DVD
2 or S with bit transmission rate of 143 Mbps
If it is based on the DTI signal DTI, the 8-bit word string data DZ '(8) is stored in the memory means for 10 line periods, for example, at a frequency of 57.2 MHz.
In accordance with a write control signal having a frequency formed based on the word clock signal CXR of 57.2 MHz and 57.2 MHz, a 10-line period of the 8-bit word string data DZ '(8) written in the memory means is written. The frequency formed from the memory means based on the word clock signal CXR having the frequency of 57.2 MHz is 57.2 MHz.
According to a read control signal with z / 4 = 14.3 MHz,
A process of reading out 10 bits at a time is performed, whereby D
Two signal DVD2 or bit transmission rate of 143Mb
The SDTI signal DTI at ps is reproduced.

Further, when the discrimination signal CD indicates that the composite 8-bit word string data DZ (8) is based on the 480P signal DVP, therefore, the 8-bit word string data DZ '(8) is If it is based on DVP, 8-bit word string data DZ '
(8) is written into the memory means for each of the five line periods, for example, in accordance with a write control signal having a frequency of 108 MHz formed based on the word clock signal CXR having a frequency of 108 MHz, and is also written into the memory means. The 5-line period of the obtained 8-bit word string data DZ '(8) is stored at a frequency of 108 MHz from the memory means.
In accordance with the read control signal that sets the frequency formed based on the word clock signal CXR to be 108 MHz / 2 = 54 MHz, a process of reading 10 bits at a time is performed, thereby reproducing the 480P signal DVP.

In this way, the word data separation.
The additional word data group DWA, DWB or DWC is taken out from the bit word string data forming section 32, and the D1 signal DVD1 and the bit transmission rate are set to 2
SDTI signal DTI and D2 signal DV at 70 Mbps
D2, SDT with bit transmission rate of 143 Mbps
The I signal DTI or the 480P signal DVP is transmitted as a restored digital video signal.

[0118]

As is apparent from the above description, the data transmission method according to any one of the first to fifth aspects of the present invention, and the claims of the present application In the data transmission apparatus according to any one of claims 6 to 8 of the present invention, for example, D1 signal, D2 signal, SDTI signal, 480P signal, etc. Is accurately determined by determining the clock frequency of the digital video signal, and a determination output signal corresponding to the determination result is obtained.
Then, for example, a D1 signal, a D2 signal, an SDTI signal,
A process of inserting an additional word data group including word synchronization data into data forming a digital video signal such as a 480P signal or the like is appropriately performed in a manner corresponding to the discrimination output signal. Word string data including word synchronization data is formed.
P / S conversion means incorporating 8B / 10B conversion means is used to convert word string data including word synchronization data into 8 / 10B data.
B / 10B conversion is performed to form composite word string data (third word string data) whose transmission speed is in accordance with the discrimination output signal, and the data is converted into serial data and transmitted.

The compound word string data formed in the P / S conversion means having the built-in 8B / 10B conversion means includes, for example, D1 signal, D2 signal, SDTI signal,
The input digital video signal, which is based on the input digital video signal, which is one of the 0P signal or the like, and the transmission speed thereof is determined according to the discrimination output signal, , D1 signal, D2 signal, SDTI signal, 480P signal, etc. In this way, the composite word string data whose transmission speed is suitable for the input digital video signal is converted into serial data and transmitted, which includes word synchronization data having a preset code. Will be included.

In the composite word string data converted into serial data and transmitted as described above, word synchronous data having a preset code is converted into, for example, D1 signal, D2 signal, SDTI signal, and 480P at the receiving side. It is to be properly detected as word synchronization data required for processing for reproducing a digital video signal, which is one of signals and the like. Also,
The word string data other than the word synchronization data included in the compound word string data converted into serial data and transmitted is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. become.
Therefore, on the receiving side, any one of, for example, a D1 signal, a D2 signal, an SDTI signal, a 480P signal, etc., based on the composite word string data received under the condition that good transmission quality is obtained. A state in which a data synchronization state required for processing for reproducing a digital video signal can be reliably obtained.

As described above, the data transmission method according to any one of claims 1 to 5 in the claims of the present application, or claims 6 to 5 in the claims of the present application According to the data transmission apparatus according to the present invention, the addition of word synchronization data to the data to be transmitted and
B / 10B conversion is performed to form word string data including word synchronization data and subjected to 8B / 10B conversion based on data to be transmitted, and the word string data is converted to serial data and transmitted. When transmitting digital video signals using the transmission method
Regardless of which digital video signal such as D1 signal, D2 signal, SDTI signal, or 480P signal is to be transmitted, existing integrated circuit elements (IC elements)
With a configuration that can effectively utilize such data, the data forming the digital video signal to be transmitted is accurately determined, and the data is transmitted properly at an appropriate transmission speed while obtaining good transmission quality. You can do it.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a data transmission method according to an embodiment of the present invention; FIG. 9 is a block diagram showing an example of a data transmission device according to the invention described in any one of claims 8 to 8.

FIG. 2 is a time chart for explaining one example of a data transmission method according to the invention described in any one of claims 1 to 5 in the claims of the present application.

FIG. 3 is a block diagram showing a specific configuration example of an 8-bit word string data formation / synchronization data insertion unit in the data transmission device shown in FIG. 1;

FIG. 4 is a time chart for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 5 in the claims of the present application.

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

FIG. 6 shows an example of a data receiving apparatus for receiving a transmission signal transmitted according to an example of the data transmission method according to any one of claims 1 to 5 in the claims of the present application. It is a block block diagram.

FIG. 7 is a flowchart provided to explain an operation of a synchronous data detection / S / P converter / 10B / 8B converter in the data receiving apparatus shown in FIG. 6;

FIG. 8 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 6;

FIG. 9 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 6;

FIG. 10 is a conceptual diagram used for explaining a “frame” used in transmitting digital data.

FIG. 11 is a conceptual diagram serving to explain word synchronization data used in transmitting digital data.

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

FIG. 13 is a conceptual diagram explaining an example of a data format of a digital video signal.

FIG. 14 is a conceptual diagram illustrating an example of a data format of a digital video signal.

[Explanation of symbols]

11: Compound word string data forming unit, 12: Clock frequency discriminating unit, 13: 8-bit word string data forming / synchronous data inserting unit, 14, 15, 16 ...
Word data transmission unit, 17 ... data addition unit, 1
8, 23 ... switch, 19 ... switch control signal forming unit, 20, 21 ... memory unit, 22 ...
Memory control signal forming unit, 25: 8B / 10B conversion unit built-in P / S conversion unit, 26: transmission unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/40 H04L 13/00 307C F-term (Reference) 5C025 AA03 AA09 5K028 AA14 BB08 GG00 KK01 KK03 KK18 MM17 NN01 SS06 SS16 5K029 AA11 CC04 DD02 EE18 FF10 GG03 HH21 JJ01 5K034 AA05 HH01 HH02 HH05 HH12 HH16 MM08 PP05 5K047 CC01 FF17 HH01 HH12 HH43 LL04 LL05

Claims (8)

[Claims] The digital video signal is input to the digital video signal to determine a clock frequency of the input digital video signal, to obtain a determined output signal corresponding to the determined clock frequency. A process of obtaining first word string data based on a video signal and inserting an additional word data group including word synchronization data having a preset code at a predetermined word interval in the first word string data Is performed in a manner corresponding to the discrimination output signal to form second word string data whose transmission speed is in accordance with the discrimination output signal. Using the serial conversion means, the additional word data group whose transmission speed is determined according to the discrimination output signal is The input second word string data is subjected to 8-bit / 10-bit conversion, and includes word-sync data after 8-bit / 10-bit conversion having a preset code obtained based on the word synchronization data. A data transmission method for forming third word string data having a portion based on the additional word data group, converting the third word string data into serial data, and transmitting the serial data for transmission. 2. A process for inserting an additional word data group into the first word string data in a manner corresponding to a discrimination output signal, wherein a predetermined number of the first word string data into which the additional word data group is inserted is included. 2. The data transmission method according to claim 1, wherein a word interval is selected according to the discrimination output signal. 3. A process for inserting an additional word data group into a first word string data in a manner corresponding to a discrimination output signal, wherein the additional word data group is divided into a plurality of additional word data having different transmission speeds. 3. The data transmission method according to claim 1, wherein a group corresponding to the discrimination output signal is selected from a group. 4. The first word string data is 8-bit word string data, the second word string data is 8-bit word string data including 8-bit word synchronization data, and the third word string data is 10-bit word data. 10 including synchronization data
2. The method according to claim 1, wherein the data is bit word string data.
The data transmission method according to any one of claims 1 to 3. 5. The data transmission method according to claim 1, wherein the input digital video signal is a signal having a data format of 10-bit word string data. 6. A clock frequency discriminating means for discriminating a clock frequency of an input digital video signal and obtaining a discrimination output signal corresponding to the discriminated clock frequency, and processing for extracting a predetermined number of bits from the digital video signal To obtain first word string data based on the digital video signal, and additional word data including word synchronization data having a code preset at a predetermined word interval from the first word string data. Performing a process of inserting a group in a manner corresponding to the discrimination output signal to form a composite word string data forming means for forming second word string data whose transmission speed is in accordance with the discrimination output signal; The second word string data is subjected to 8-bit / 10-bit conversion, and is obtained based on the word synchronization data. Forming third word string data having a portion based on the additional word data group, including the word synchronization data after the 8-bit / 10-bit conversion having a preset code, and forming the third word string. Parallel / serial conversion means for converting data into serial data, the parallel / serial conversion means including an 8-bit / 10-bit conversion means;
A transmission means for transmitting serial data obtained from the serial conversion means for transmission. 7. When the compound word string data forming means inserts the additional word data group into the first word string data in a manner corresponding to the discrimination output signal, the compound word string data forming means inserts the additional word data group. 1
7. A predetermined word interval in the word string data is selected according to the discrimination output signal.
A data transmission device according to claim 1. 8. When the compound word string data forming means inserts an additional word data group into the first word string data in a manner corresponding to the discrimination output signal, the additional word data group is transmitted at a transmission speed. 8. The data transmission apparatus according to claim 6, wherein a plurality of different additional word data groups are selected as those corresponding to the discrimination output signal.