JP2001245000A - Data transmission method and data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately discriminate plural types of digital video signals and then transmit them properly in a transmission method where the word string data which include the word synchronous data based on the data to be transmitted and also undergone the 8B/10B conversion are converted into the serial data and transmitted. SOLUTION: The clock frequency of input digital video signals are discriminated and the discriminated output signals are generated, and the 8-bit word string data based on the input digital video signals are obtained. Then an additional word group including the word synchronous data having the codes that are previously set in each prescribed word space is inserted into the 8-bit word string data in a mode corresponding to the discriminated output signals. Thus the composite 8-bit word string data are obtained and then undergo the 8B/10B conversion for generating the composite 10-bit word string data which are converted into the serial data and transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application 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 data, and inserts word synchronization data into the word string data. A data transmission method for performing 8 bit / 10-bit conversion on the word string data into which the synchronization data has been inserted to obtain transmission word string data, converting the transmission word string data into serial data, and transmitting the serial data for transmission. The present invention relates to a data transmission device provided for 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, 10-bit word string data is transmitted on the receiving side.
In the 10B / 8B conversion performed on the bit word string data, it is necessary to accurately grasp each word data having a 10-bit configuration. Therefore, the 10-bit word string data transmitted as serial data is transmitted on the transmission side. , Word synchronization data is appropriately inserted. 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. Once, R
D is assumed to be 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 signal format under the SDTI (SDTI signal format) is, for example, as shown in FIGS.

FIG. 13 shows one line period in the SDTI signal format under the condition that the bit transmission rate at the time of serialization is 270 Mbps. Has formed. Then, one frame period is formed by, for example, 525 line periods formed by connecting 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.
Indicates one line period in the TI signal format,
One word forms 10-bit word string data 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 signal 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 It is transmitted in the form of a transmission signal that is converted into an optical signal.

The D1 signal, D2 signal, 480
Regarding the transmission of digital video signals such as P signals and SDTI signals, the transmitting side should add word synchronization data to the data forming the digital video signals 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. D1 signal, D2 signal, 480P signal, SDTI signal having a transmission method in which word string data including synchronous data and subjected to 8B / 10B conversion is 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, 480P signal, SDTI signal, etc. is to be transmitted, the digital video signal to be transmitted is required. If the data that forms the signal can be accurately identified and transmitted properly, the same transmission system 1 signal, D2 signal, 480P signals, also can transmit any of the digital video signal such as SDTI signals, a very convenient, D1 signal,
The range of use of digital video signals such as D2 signal, 480P signal, SDTI signal and the like can be expanded. The expansion of the use range of digital video signals such as the D1 signal, D2 signal, 480P signal, SDTI signal, etc.
It will result in further development of technology in the field of commercial or consumer electronics.

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 using a transmission method in which word string data that includes and is subjected to 8B / 10B conversion is converted to serial data and sent out, the D1 signal, the D2 signal, and the 4
Regardless of which digital video signal such as an 80P signal or an SDTI signal is to be transmitted, it is necessary to accurately determine the data forming the transmitted digital video signal and transmit the data properly. There is no concrete example that has realized such a transmission system. In addition, there can be found literatures and the like describing a technique relating to a transmission system capable of appropriately transmitting data forming any of digital video signals such as a D1 signal, a D2 signal, a 480P signal, and an SDTI signal. Absent.

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, a 480P signal, an SDTI signal, etc. A data transmission method capable of accurately determining data forming a digital video signal to be transmitted and transmitting the digital video signal properly regardless of which digital video signal is to be transmitted. , And a data transmission device provided for the implementation.

[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 digital video signal is performed to obtain first word string data based thereon, and the first word string data is converted to the first word string data. The process of inserting an additional word data group including word synchronization data having a preset code at a predetermined word interval is performed in a manner corresponding to the discrimination output signal, thereby forming the second word string data. Then, 8B / 10B conversion is performed on the second word string data into which the additional word data group is inserted, and Forming the third word string data having a portion based on the additional word data group, including the word synchronization data after the 8B / 10B conversion having the preset code obtained based on the third word string data. Is converted into serial data, and the serial data is transmitted for transmission.

[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 discrimination output signal, the additional word data group is assumed to correspond to the discrimination output signal from the plurality of additional word data groups. Shall be selected.

On the other hand, the data transmission apparatus according to any one of the twelfth to fourteenth aspects of the present invention determines the clock frequency of an input digital video signal and determines the clock frequency. A clock frequency discriminating means for obtaining a discrimination output signal corresponding to the obtained clock frequency, a process of extracting a predetermined number of bits from the digital video signal to obtain first word string data based on the digital video signal, and A process of inserting an additional word data group including word synchronization data having a preset code at predetermined word intervals in the word string data is performed in a manner corresponding to a discrimination output signal obtained from the clock frequency discrimination means. By
8B / 10 having a preset code obtained based on the word synchronization data by forming the second word string data and subjecting the second word string data to 8B / 10B conversion
Composite word string data forming means for forming third word string data having a portion based on the additional word data group including the word synchronization data after the B conversion, and a third word string obtained from the compound word string data forming means Data transmission means for converting the word string data into serial data and transmitting the serial data for transmission.

[0031] In particular, in the data transmission device according to the invention described in claim 13 of the present application, 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 obtained from the clock frequency discrimination means, 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. It is composed.

[0032] Further, in particular, in the data transmission apparatus according to the invention described in claim 14 of the present application, the compound word string data forming means inserts an additional word data group into the first word string data. In performing the processing to be performed in a manner corresponding to the discrimination output signal obtained from the clock frequency discriminating means, the additional word data group is selected from the plurality of additional word data groups as the one corresponding to the discrimination output signal. It is composed.

The data transmission method according to any one of claims 1 to 11 in the claims of the present application as described above, and claims 12 to 11 in the claims of the present application. In the data transmission device according to the invention described in any one of the aforementioned items 14, the input digital video signal is, for example, any one of a D1 signal, a D2 signal, a 480P signal, an SDTI signal, and the like. The determination 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. Then, for example, a process of inserting an additional word data group including word synchronization data into data forming a digital video signal which is any of the D1 signal, the D2 signal, the 480P signal, the SDTI signal, etc. Properly performed in a manner corresponding to the output signal, and further subjected to 8B / 10B conversion to form third word string data.

The third word string data obtained in this way is converted into serial data and transmitted, which includes word synchronization data having a preset code. 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
-K28. Word data DS10 with RD being negative.
5 is assumed.

The third word string data which is converted into serial data and transmitted is supplied to the receiving side by
The word synchronization data having a preset code is required for processing for reproducing a digital video signal, for example, any one of a D1 signal, a D2 signal, a 480P signal, an SDTI signal, and the like. Is to be properly detected. Also,
The word string data other than the word synchronizing data included in the third word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, for example, the D1 signal, the D2 signal, and the 480P based on the third 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, which is one of a signal, an SDTI signal, and the like, is reliably obtained.

As described above, the data transmission method according to any one of the first to eleventh aspects of the present invention, or the twelfth aspect of the present invention, According to the data transmission device according to the invention described in any one of claims 14 to 14,
The addition of the word synchronization data to the data to be transmitted and the 8B / 10B conversion are performed to include the word synchronization data based on the data to be transmitted and to include 8B / 1
When a digital video signal is transmitted using a transmission method in which word string data subjected to 0B conversion is formed and the word string data is converted into serial data and transmitted, for example, a D1 signal, a D2 signal, a 480P signal, S
Even when a digital video signal to be transmitted, such as a DTI signal, is to be transmitted, the data forming the digital video signal to be transmitted is accurately determined and transmitted. The transmission can be performed properly while the quality is obtained.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a data transmission method according to the present invention described in any one of the first to eleventh aspects of the present invention. Claims 12 to 14 in the range of
An example of the data transmission device according to any one of the inventions described above is shown.

In the example shown in FIG.
1 signal DVD1, D2 signal DVD2, 480P signal DV
A digital video signal, which is a P or SDTI signal DTI, 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 480P signal DVP is
The data forming the data is 10-bit word string data having the same data sequence as the data forming the D1 signal DVD1, and the word transmission rate is set to, for example, 5 bits.
4 MBps, and therefore the 480P signal D
The clock frequency of the VP is, for example, 54 MHz.
Further, the SDTI signal DTI has a format in which data forming the SDTI signal is, for example, 10-bit word string data in the form of a data series as shown in FIG. 13 or FIG. 14, and the bit transmission rate is, for example, 270 Mbps or 143 Mbps, and therefore SDT
The clock frequency (frequency of the word clock signal) of the I signal DTI is, for example, 27 MHz or 14.3M.
Hz.

Further, for example, the D1 signal DVD1 and the D2 signal DVD supplied to the compound word string data forming unit 11
A word clock signal CX of a digital video signal, which is one of the 2,480P signal DVP and the SDTI signal DTI, is supplied to each of the composite word string data forming unit 11 and the clock frequency determining unit 12. 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 the VD2, 480P signal DVP and the SDTI signal DTI it is.

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 receives any one of the line periods of the D1 signal DVD1, the D2 signal DVD2, the 480P signal DVP, and the SDTI signal DTI supplied to the compound word string data forming unit 11. The horizontal synchronizing signal SH and the vertical synchronizing signal SV synchronized with each other during the field period are also supplied.
Hz.

In the composite word string data forming section 11, the D1 signal DVD1, the D2 signal DVD2, 48
The 0P signal DVP or the SDTI signal DTI 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 word clock signal CX, a discrimination output signal SCD from the clock frequency discrimination unit 12, and a horizontal synchronization signal S.
H, a vertical synchronizing signal SV and a clock signal CA are also supplied.

Further, to the compound word string data forming section 11, a word data transmitting section 14 for transmitting the additional word data group DWA, a word data transmitting section 15 for transmitting the additional word data group DWB, and an additional word data group DWC are transmitted. A word data transmitting unit 16 is provided. Then, the word data sending units 14 and 15
And 16 are supplied with the discrimination output signal SCD from the clock frequency discrimination unit 12, and the discrimination output signal SCD is supplied to the composite word string data forming unit 11 with the D1 signal DVD1 or the SDTI signal DTI with a bit transmission rate of 270 Mbps. In this case, the word data transmitting unit 14 transmits the additional word data group DWA, and the discrimination output signal SCD is transmitted to the composite word string data forming unit 11 by the D2 signal DVD2 or the bit transmission rate. SDTI signal D with 143 Mbps
When indicating that the TI is supplied, the word data sending unit 15 sends the additional word data group DWB, and the discrimination output signal SCD is output to the composite word string data forming unit 11 by the 480P signal DVP. When indicating that the word data is supplied, the word data sending unit 16 sends the additional word data group DWC. Additional word data groups DWA, DWB and DW
Each of C is composed of a plurality of 8-bit word data including 8-bit word synchronization data, and is 8-bit word string data having a word transmission rate of 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.

In the 8-bit word string data forming / synchronizing data inserting section 13, the horizontal synchronizing signal SH, the vertical synchronizing signal SV, the discrimination output signal SCD from the clock frequency discriminating section 12, the word clock signal CX, Using a clock signal CA, 10 bits forming each word as 10-bit word string data sequentially arrive at D bits.
1 signal DVD1, D2 signal DVD2, 480P signal DV
P or SDTI signal DTI, each bit data is sequentially taken out 8 bits at a time on the basis of EAV. For example, in FIG. 2A, D / 0 to D / 7, D / 8 to D /
15, D / 16 to D / 23, ... (D / 0, ...
.., D / 23,... Represent each bit data), and the 8-bit word data is sequentially formed, and the 8-bit word data is converted into a predetermined word. By performing a process of connecting the data by several numbers, 8-bit word string data DZ '(8) having a word transmission rate of 108 MBps is obtained.

Further, in the 8-bit word string data forming / synchronizing data inserting section 13, the D1 signals DVD1, D1
2-signal DVD2, 480P signal DVP or SDTI
An 8-bit word string data DZ '(8) obtained based on the signal DTI is added at a predetermined word interval to the 8-bit word string data DZ' (8) including 8-bit word synchronization data from the word data transmission unit 14, 15, or 16. Insert a word data group DWA, DWB or DWC, thereby
D1 signal DVD1, D2 signal DVD2, 480P signal D
Based on the VP or SDTI signal DTI, additional word data groups DWA, DW as shown in FIG.
A word transmission rate of 108 including B or DWC
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 a specific configuration example 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
2,480P signal DVP or SDTI signal DTI
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 is supplied with the horizontal synchronizing signal SH, the vertical synchronizing signal SV, the clock signal CA and the discrimination output signal SCD. The control signal CSA and the control signal CSB are formed as follows according to the SV, the clock signal CA, 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 with 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 cycle of the clock signal CA 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. DVD2 or bit transmission rate 143
Mbps, for example, in the SDTI signal DTI
A control signal CSA synchronized with the beginning of 10 line periods starting from the EAV and a control signal CSB synchronized with a period that is an integral multiple of the cycle of the clock signal CA are formed. 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 480P signal DVP supplied to the switch 18 is provided.
In the VP, 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 cycle of the clock signal CA are formed.

The switch 18 is connected to a memory section 20 and a memory section 21. 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 and the clock signal CA are supplied to the memory control signal forming unit 22. Then, the memory control signal forming unit 22 generates a write control signal QW having a frequency of 27 MHz based on the word clock signal CX (the composite word string data forming unit 11 outputs the D1 signal DVD1
Or SD with a bit transmission rate of 270 Mbps
When the TI signal DTI is supplied), the frequency is set to 14.3.
MHz when the write control signal QW is generated (the composite word string data forming unit 11 outputs the D2 signal DVD2 or the SDTI signal D whose bit transmission rate is 143 Mbps).
TI is supplied) or the frequency is 54 MH
and a state in which a write control signal QW as z is generated (when the 480P signal DVP is supplied to the composite word string data forming unit 11), and based on the clock signal CA,
In a state where a read control signal QR having a frequency of 108 MHz is generated, the write control signal QW and the read control signal QR are supplied to both the memory units 20 and 21.

Accordingly, 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 composite word string data forming section 11, the D1 signal is supplied 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 at 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.

Therefore, 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 DTI 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.

Further, in the memory section 20, the D2 signal DVD2 or the SDTI signal DT having a bit transmission rate of 143 Mbps is supplied 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.

Therefore, 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 section 20
D1, SDT with bit transmission rate of 270 Mbps
EAV of I signal DTI or 480P signal DVP
5 line period starting from, or D2 signal DVD
2 or S with bit transmission rate of 143 Mbps
The DTI signal DTI for 10 line periods starting from the EAV includes a D1 signal DVD1 following the writing period, an SDTI signal DTI having a bit transmission rate of 270 Mbps,
Alternatively, a 5-line period starting from the EAV of the 480P signal DVP, or an SDTI signal DTI with a D2 signal DVD2 or a bit transmission rate of 143 Mbps
In the 10-line period starting from the EAV, the data is read out from the memory unit 20 in units of 8 bits in accordance with the read control signal QR having a frequency of 108 MHz, and an 8-bit word is sequentially formed. Thereby, the memory unit 2
From 0, 8-bit word string data DZ '(8) having a word transmission rate of 108 MBps is obtained and supplied to the switch 23.

The D1 signal DVD1 written in the memory unit 21, the SDTI signal DTI with a bit transmission rate of 270 Mbps, or the 480P signal DVP for five line periods starting from the EAV, or the D2 signal DVD2 or the bit transmission rate Signal DTI that has a bit transmission rate of 270 Mbps following the writing period for the 10-line period starting from the EAV of the SDTI signal DTI having the bit rate of 143 Mbps.
A read control signal having a frequency of 108 MHz in a 5-line period starting from the EAV of the TI or 480P signal DVP or a 10-line period starting from the EAV of the D2 signal DVD2 or the SDTI signal DTI having the bit transmission rate of 143 Mbps. Depending on the QR,
The data is read from the memory unit 21 by 8 bits at a time to form an 8-bit word sequentially. Thereby, 8-bit word string data DZ ′ (8) having a word transmission rate of 108 MBps is obtained from the memory unit 21 and supplied to the switch 23.

The switch 23 controls the D1 signal DVD1 or the bit transmission rate from each of the memory units 20 and 21 to 270 M in addition to the 8-bit word string data DZ '(8).
When the SDTI signal DTI at bps is read and 8-bit word string data DZ '(8) is obtained, the word transmission rate from the word data transmitting unit 14 is set to 108 MBps.
And an SDTI signal DTI having a bit transmission rate of 143 Mbps is read out from each of the memory units 20 and 21 and an 8-bit word string data DZ ′ (8) is read out.
Is obtained, an additional word data group DWB with a word transmission rate of 108 MBps from the word data transmission unit 15 is further read out from the memory units 20 and 21 by the 480P signal DVP, and the 8-bit word string data DZ is read out. When '(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 controlling 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. Thereby, the word transmission rate is set to 108 from the switch 23.
The word transmission rate is set to 108 MB at a predetermined word interval in the 8-bit word string data DZ '(8) having MBps.
The composite 8-bit word string data DZ (8) formed by inserting the additional word data group DWA, DWB or DWC of ps is derived.

As described above, the composite 8-bit word string data DZ (8) derived from the switch 23 is supplied from the 8-bit word string data forming / synchronizing data inserting unit 13 to 8B
The 8B / 10B converter 2 is supplied to the
In 4, conversion to 10 bits is performed for every 8 bits, and 8B / 10B conversion is performed according to a conversion table prepared in advance.

An additional word data group DWA with a word transmission rate of 108 MBps from the word data transmission section 14, an additional word data group DWB with a word transmission rate of 108MBps from the word data transmission section 15, and a word data transmission section 16 Each of the additional word data groups DWC having a word transmission rate of 108 MBps from is configured as 8-bit word string data. As an example, each of the first part and the last part thereof has an 8-bit word synchronization data. A set of two words in which 8-bit word auxiliary data DEA8 continues to DEK8 is arranged three times.

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 word synchronization data DEK8 is converted into 10-bit word data, it is called with a code name of K28.5. When the CRD, which is the RD of the word data arranged immediately before, is negative (-), + K2
8.5, and when the CRD, which is the RD based on the word data arranged immediately before, is positive (+), -K2
8.5.

On the other hand, 8-bit word auxiliary data DEA8
Is 8-bit word data represented by "01110101" as shown in FIG. 4. When converted into 10-bit word data, it is called by a code name of D21.3. D21.3 is “101010 11 when the CRD, which is the RD based on the word data placed immediately before, is negative (−), and the RD is neutral.
00 ", and when the CRD, which is the RD based on the word data immediately preceding it, is positive (+), it is set to" 1010100011 ", which makes the RD neutral.

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.

[0073]

(1) (85,800 (bit) + BX (bit))
/ T (s) = 108 (MBps) × 10 (bits) × 8
/ 10

Therefore, BX = 188,760 bits. That is, the word data sending section 14 has a total of 188,
An additional word data group DWA formed by 760 bits (23,595 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.

[0076]

## EQU2 ## (91,000 (bits) + BX (bits))
/ T (s) = 108 (MBps) × 10 (bits) × 8
/ 10

Therefore, BX ≒ 458,818 bits. That is, the word data sending section 15 has a total of 458,
An additional word data group DWB formed by 818 bits (68,602 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:

[0079]

## 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. 5A. Is done. In FIG. 5A, 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.

The additional word data group DWA whose word transmission rate from the word data transmission section 14 is 108 MBps, the additional word data group DWB whose word transmission rate from the word data transmission section 15 is 108 MBps, and the word data transmission section 16 As another example, each of the additional word data groups DWC having a word transmission rate of 108 MBps from the first 8-bit word synchronization data DEK8 is followed by a predetermined number of arbitrary 8-bit word data DEX8, Any 8 of
The bit word data DEX8 is followed by a second 8-bit word synchronization data DEK8, and further the second 8-bit word synchronization data DEK8 is followed by an arbitrary 8-bit word data DEX8. 8-bit word data DE immediately before DEK8
X8 is set to be 10-bit word data -DXX.X in which RD is negative (-) when 8B / 10B converted. When the additional word data group DWA, DWB or DWC is used, when the composite 8-bit word string data DZ (8) into which the additional word data group DWA, DWB or DWC is inserted is subjected to the 8B / 10B conversion, the additional word data group DWA, RD of 10-bit word data -DV10 obtained by subjecting 8-bit word data DV8 immediately before DWB or DWC to 8B / 10B conversion is set to negative (-).

Also in such a case, the word data transmitting section 14 generates an additional word data group D formed by 188,760 bits (23,595 words) as a whole.
WA is transmitted, and the word data transmitting unit 15
An additional word data group DWB formed by 8,818 bits (68,602 words) is sent out. 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 into which the additional word data group DWA, DWB or DWC is inserted is as shown in FIG. 6A. . DEK8 and DV8 shown in FIG. 6A correspond to DK8 and DV8 shown in FIG.
It is the same as EK8 and DV8.

The 8B / 10B conversion section 24 converts the composite 8-bit word string data DZ (8) from the 8-bit word string data formation / synchronization data insertion section 13 into 8B / 10B.
After conversion, composite 8-bit word string data DZ (8)
, Forming composite 10-bit word string data DZ (10) having a word transmission rate of 108 MBps.
At this time, the 8-bit word synchronization data DEK (8)
28.5, the 8-bit word auxiliary data DEA (8) is converted to D21.3, and any 8-bit word data DEX8 is converted to 10-bit word data DXX. Converted to X.

Therefore, composite 8-bit word string data D
Z (8) additional word data group DW inserted
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 portion based on WA, DWB or DWC is as shown in FIG. 5B when the immediately preceding 10-bit word data DV10 makes RD positive (+),
On the other hand, the immediately preceding 10-bit word data DV10 is R
When D is negative (-), it is as shown in FIG. 5C. Therefore, in any case, the portion based on the additional word data group DWA, DWB or DWC includes a plurality of + K28.5 with RD being positive (+).

The composite 8-bit word string data DZ
The additional word data group DWA inserted in (8),
When DWB or DWC is as shown in FIG. 6A, 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 the RD for the immediately preceding 10-bit word data DV10 is set to negative (-).
Therefore, in a portion based on the additional word data group DWA, DWB or DWC, RD is set to positive (+) +
K28.5 will be included.

The composite 8-bit word string data DZ
(8) is the additional word data group DWA, DW
When the portion where B or DWC is inserted is as shown in FIG. 5A or as shown in FIG. 6A, the additional word data group DWA,
DWB or DWC is based on additional word data group DWA, DWB or DWC in composite 10-bit word sequence data DZ (10) obtained by subjecting composite 8-bit word sequence data DZ (8) to 8B / 10B conversion. , RD are positive (+), that is, 10-bit word synchronization data, that is, data that includes + K28.5. However, in some cases, the composite 8-bit word string data DZ (8)
Is that the portion where the additional word data group DWA, DWB or DWC is inserted is as shown in FIG. 5A or similar to that shown in FIG. 6A. Wherein the additional word data group DWA, DWB or DWC is added word data in the compound 10-bit word string data DZ (10) obtained by subjecting the compound 8-bit word string data DZ (8) to 8B / 10B conversion. In a part based on the group DWA, DWB or DWC, it may be selected to include 10-bit word synchronization data with RD being negative (-), that is, -K28.5.

Under the circumstances described above, the composite 10-bit word string data DZ (10) formed in the 8B / 10B conversion section 24 is sent out from the composite word string data formation section 11 and is converted into a P / S conversion section. 25. In the P / S converter 25, the composite 10-bit word string data DZ
(10) is subjected to P / S conversion, and the bit transmission rate based on the composite 10-bit word string data DZ (10) is set to 1
The serial data DZS of 08 MBps × 10 = 1.08 Gbps is formed, and the serial data DZS is supplied to the transmission unit 26. The transmission unit 26 receives the serial data D
For example, in order to transmit the ZS through a data transmission line formed using optical fibers, the ZS is transmitted as a transmission signal SZ which is an optical signal or the like suitable for the data transmission line formed using optical fibers. I do. Thereby, transmission of the serial data DZS is performed.

In the data transmission apparatus shown in FIG. 1 as described above, P / S conversion section 25 and transmission section 26 transmit composite 10-bit word string data DZ (10) having a word transmission rate of 108 MBps. Set the bit transmission rate to 1.
Since the data is converted into serial data DZS having a transmission rate of 08 Gbps and transmitted, such a P / S converter 25 and a transmitter 26 are provided, for example, for transmitting a digital video signal under a fiber channel system. The integrated circuit (IC) element can be effectively used. Therefore, the word synchronization data is added to the data to be transmitted and the 8B / 10B conversion is performed to form word string data including the word synchronization data and subjected to the 8B / 10B conversion based on the data to be transmitted. When transmitting a digital video signal using a transmission method in which the word string data is converted into serial data and transmitted, for example, a D1 signal,
Regardless of which of the digital video signals such as the D2 signal, the 480P signal, and the SDTI signal is to be transmitted, the data forming the digital video signal to be transmitted is accurately determined, and this is determined. With good transmission quality being obtained, transmission can be performed using means that can be arranged properly and relatively easily.

FIG. 7 is a diagram showing an example of a 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. 7, for example, a receiving section 30 for receiving a transmission signal SZ transmitted through a data transmission path formed by using an optical fiber is provided. ing. When receiving the transmission signal SZ, the receiving unit 30 reproduces the serial data DZS based on the received transmission signal SZ, and detects the reproduced serial data DZS as synchronous data detection / S / P.
It is supplied to the converter 31.

In the synchronous data detection / S / P converter 31, + K28.5 (or -K28.) Which is 10-bit word synchronous data in the serial data DZS is used.
5) Detects the portion converted to serial data as synchronous data, performs word synchronization based on the detected synchronous data, and performs S / P conversion on the serial data DZS. For example, A or C in FIG. Alternatively, as shown in FIG. 9A, composite 10-bit word string data DZ (10), which is parallel data with a word transmission rate of 108 MBps, is formed. Such composite 10-bit word string data DZ (10) includes a portion based on the additional word data group DWA, DWB or DWC, and is composed of the composite 10-bit data shown in A or C in FIG. 8 or A in FIG. The word string data DZ (10) includes the contents of the portion based on the additional word data group DWA, DWB or DWC and the additional word data group DW.
A, DWB or DWC is selectively formed according to the RD of the data immediately before the portion based on DWC. Then, the composite 10-bit word string data DZ (10) obtained from the synchronous data detection / S / P conversion section 31 is supplied to the 10-bit word string data restoration section 32.

The synchronous data detection / S / P converter 31
, The composite 10-bit word string data DZ (1
0) additional word data groups DWA, DWB
Alternatively, + K28.5 (or -K28.5) in the portion based on DWC is detected as synchronous data, and K2 is detected.
Send out 8.5 detection output signal SWS. This K28.5
The detection output signal SWS is an additional word data group DW in the composite 10-bit word string data DZ (10).
According to the contents of the portion based on A, DWB or DWC and the RD of the data immediately before the portion based on the additional word data group DWA, DWB or DWC, for example, shown in B or D in FIG. 8 or B in FIG. Obtained as Thus, synchronous data detection / S / P
K28.5 detection output signal SWS obtained from converter 31
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.

The 10-bit word string data restoration section 32 to which the composite 10-bit word string data DZ (10) is supplied from the synchronization data detection / S / P conversion section 31 receives the synchronization control signal from the control signal forming section 33. CW is also provided. Then, in the 10-bit word string data restoration unit 32,
The composite 10-bit word string data DZ (10) is 10B /
The data is supplied to the 8B conversion unit 34, and the 10B / 8B conversion unit 34 performs 10B / 8B conversion on the composite 10-bit word sequence data DZ (10). DZ (8) is formed.

At this time, the 10-bit word data DV1 included in the composite 10-bit word string data DZ (10)
0 is converted to 8-bit word data DV8. The additional word data group DWA, DWB or DW in the composite 10-bit word string data DZ (10)
± DXX · X, ± K28.5 and D21.3, which are 10-bit word data included in the portion based on WC, are converted into 8-bit data DEX8, 8-bit word synchronization data DEK8, and 8-bit word auxiliary data DEA8, respectively. Is done. As a result, the composite 8-bit word string data DZ (8) obtained in the 10B / 8B conversion unit 34 corresponds to the composite 8-bit word string data DZ (8) shown in FIG. 5A or FIG. It shall be.

The composite 8-bit word string data DZ (8) from the 10B / 8B conversion unit 34 has a word data separation of 1
The data is supplied to the 0-bit word string data forming unit 35. The synchronization control signal CW from the control signal forming unit 33 is also supplied to the word data separation / 10-bit word string data forming unit 35. Then, in the word data separation / 10-bit word string data forming section 35, the word transmission rate is set to 108 MBp from the composite 8-bit word string data DZ (8) under the control of synchronization by the synchronization control signal CW.
The 8-bit word string data DZ '(8) as s and the 8-bit word string data forming the additional word data group DWA, DWB or DWC are separated and extracted.

Further, in the word data separation / 10-bit word string data forming section 35, the 8-bit word string data DZ '(8) extracted from the composite 8-bit word string data DZ (8) is Each bit data is
A 10-bit word data is sequentially formed by performing a process of sequentially taking out 10 bits at a time on the basis of the AV, whereby the 10-bit word data is formed continuously, and a 10-bit word string having a word transmission rate of 27 MBps Data D1 signal DVD1 or SDTI signal DT with bit transmission rate of 270 Mbps
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 '
(8) shows that each bit data is 1 to the EAV.
In order to sequentially form 10-bit word data by sequentially taking out 0-bit data, 8-bit word string data DZ ′ (8) is converted for a predetermined period in accordance with the synchronization control signal CW from the control signal forming unit 33. In accordance with a write control signal having a frequency of 108 MHz, the frequency is written by a predetermined period of the 8-bit word string data DZ '(8) written in the memory means from the memory means to the memory means. According to a read control signal of 27 MHz, 14.3 MHz or 54 MHz, a process of reading 10 bits is performed.

For example, 8-bit word string data DZ '
If (8) is based on the D1 signal DVD1 or the SDTI signal DTI having a bit transmission rate of 270 Mbps, the 8-bit word string data DZ ′ (8) is converted to, for example, the synchronization control signal CW. In accordance with a write control signal having a frequency of 108 MHz, the 5-line period is written in the memory means in accordance with a write control signal having a frequency of 108 MHz.
The frequency for the line period is 27 MHz from the memory means.
In accordance with the read control signal described above, a process of reading 10 bits at a time is performed, whereby the D1 signal DVD1 or the SDTI signal DTI with the bit transmission rate of 270 Mbps is reproduced.

Also, 8-bit word string data DZ '
If (8) is based on the D2 signal DVD2 or the SDTI signal DTI with a bit transmission rate of 143 Mbps, the 8-bit word string data DZ ′ (8) is converted to, for example, the synchronization control signal CW. In accordance with a write control signal having a frequency of 108 MHz, the 10-line period is written according to a write control signal having a frequency of 108 MHz, and the 10-line period of 8-bit word string data DZ '(8) written in the memory unit is transferred from the memory unit. , Frequency
According to a read control signal of 3 MHz, a process of reading 10 bits at a time is performed.
Or SD with a bit transmission rate of 143 Mbps
The TI signal DTI is reproduced.

Further, 8-bit word string data DZ '
In the case where (8) is based on the 480P signal DVP, the 8-bit word string data DZ '(8) is transmitted to the memory means in accordance with the synchronization control signal CW, for example, for every five line periods. Is written in accordance with a write control signal having a frequency of 108 MHz, and a 5-line period of the 8-bit word string data DZ '(8) written in the memory means is read from the memory means in accordance with a read control signal having a frequency of 54 MHz. A process of reading out 10 bits at a time is performed, whereby the 480P signal DVP is reproduced.

In this manner, the word data separation / 10
D1 obtained in bit word string data forming section 35
The signal DVD1, the SDTI signal DTI having a bit transmission rate of 270 Mbps, the D2 signal DVD2, the SDTI signal DTI having a bit transmission rate of 143 Mbps, or the 480P signal DVP are transmitted as restored output signals from the 10-bit word string data restoration section 32. Is done.

[0104]

As is apparent from the above description, the data transmission method according to the invention described in any one of claims 1 to 11 in the claims of the present application, and
Claims 12 to 1 in the claims of the present application
In the data transmission apparatus according to any one of the inventions described in any one of (4) to (4), for example, D1 signal, D2 signal, 480P signal, SD
The determination as to whether the signal is a TI signal or the like 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, D1 signal, D2 signal, 480P
A process of inserting an additional word data group including word synchronization data into data forming a digital video signal which is either a signal or an SDTI signal is appropriately performed in a manner corresponding to the discrimination output signal. Further, 8B / 10B conversion is performed to form word string data. The word string data obtained in this way is converted into serial data and transmitted, which includes word synchronization data having a preset code.

The word string data converted into serial data and transmitted as described above includes, on the receiving side, word synchronous data having a preset code, for example,
It is assumed that the data is properly detected as word synchronization data required for processing for reproducing a digital video signal, which is any one of the D1, D2, 480P, and SDTI signals. . In addition, data other than the word synchronization data included in the word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, for example, based on the word string data received while obtaining good transmission quality, for example, D
A state in which a data synchronization state required for processing for reproducing a digital video signal, which is any one of the 1 signal, the D2 signal, the 480P signal, the SDTI signal, and the like, is ensured.

As described above, the data transmission method according to any one of the first to eleventh aspects of the present invention, or the twelfth aspect of the present invention, According to the data transmission device according to the invention described in any one of claims 14 to 14,
The addition of the word synchronization data to the data to be transmitted and the 8B / 10B conversion are performed to include the word synchronization data based on the data to be transmitted and to include 8B / 1
When a digital video signal is transmitted using a transmission method in which word string data subjected to 0B conversion is formed and the word string data is converted into serial data and transmitted, for example, a D1 signal, a D2 signal, a 480P signal, S
Even when a digital video signal to be transmitted, such as a DTI signal, is to be transmitted, the data forming the digital video signal to be transmitted is accurately determined and transmitted. The transmission can be performed properly while the quality is obtained.

[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. 15 is a block diagram showing an example of a data transmission device according to the invention as set forth in claim 14.

FIG. 2 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 11 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 conceptual diagram for explaining 8-bit word auxiliary data used in an example of the data transmission method according to any one of the first to eleventh aspects of the present invention. It is.

FIG. 5 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 11 in the claims of the present application.

FIG. 6 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 11 in the claims of the present application.

FIG. 7 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 11 in the claims of the present application. It is a block block diagram.

FIG. 8 is a time chart used for describing the operation of the data receiving apparatus shown in FIG. 7;

FIG. 9 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 7;

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, 24 ... 8B / 10B conversion unit, 25 ... P / S conversion unit, 26 ... Transmission unit

Claims (14)

[Claims] The present invention relates to a digital video signal, comprising: determining a clock frequency of an input digital video signal; obtaining a determination 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 predetermined word intervals in the first word string data Is performed in a manner corresponding to the discrimination output signal to form second word string data, and performs an 8-bit / 10-bit conversion on the second word string data into which the additional word data group is inserted. hand,
Forming third word string data having a portion based on the additional word data group, including word sync data after conversion of 8 bits / 10 bits having a preset code obtained based on the word sync data And converting the third word string data into serial data.
A data transmission method for 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 the first word string data in a manner corresponding to a discrimination output signal, wherein the additional word data group is discriminated from a plurality of additional word data groups. 3. The data transmission method according to claim 1, wherein the data transmission method is selected as one corresponding to the output signal. 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
4. The data transmission method according to claim 1, wherein the data is bit word string data. 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 portion based on the additional word data group in the third word string data in the additional word data group, which includes word synchronous data after 8 bits / 10 bits conversion with positive running disparity. 6. The data transmission method according to claim 1, wherein the data transmission method is selected. 7. A portion of the additional word data group based on the additional word data group in the third word string data includes word synchronous data after 8 bit / 10 bit conversion with negative running disparity. 6. The data transmission method according to claim 1, wherein the data transmission method is selected. 8. The method according to claim 1, wherein the additional word data group includes auxiliary word data, and the auxiliary word data is selected such that the running disparity is neutral after 8 bits / 10 bits conversion. The data transmission method according to any one of claims 1 to 7. 9. The data transmission method according to claim 8, wherein the additional word data group is selected such that a combination of word synchronization data and auxiliary word data is repeated a plurality of times. 10. When performing an 8-bit / 10-bit conversion process on the second word string data into which the additional word data group has been inserted, running disparity immediately before the word synchronization data after the 8-bit / 10-bit conversion. 6. The data transmission method according to claim 1, wherein is set to a negative value. 11. When performing an 8-bit / 10-bit conversion process on the second word string data into which the additional word data group is inserted, a running disparity immediately before the word synchronous data after the 8-bit / 10-bit conversion. The data transmission method according to claim 1, wherein is set to be positive. 12. 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 a process 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. By performing the process of inserting a group in a manner corresponding to the discrimination output signal obtained from the clock frequency discrimination means, the second word string data is formed, and the second word string data has 8 bits / 10 bits. 8 bits having a preset code obtained by performing a conversion and based on the word synchronization data Composite word string data forming means for forming third word string data having a portion based on the additional word data group, including word synchronization data after / 10-bit conversion; A data transmission unit configured to convert the third word string data to be converted into serial data and transmit the serial data for transmission. 13. 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
2. A predetermined word interval in the word string data is selected according to the discrimination output signal.
3. The data transmission device according to 2. 14. 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 added to a plurality of additional word data groups. 14. The data transmission device according to claim 12, wherein a word data group is selected as one corresponding to the discrimination output signal.