JP2001197130A - Method and device for transmitting data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the multiplex transmission of plural digital video signals by a transmitting system, with which word stream data containing word synchronizing data formed on the basis of data to be transmitted are sent out as serial data by applying 8 bits/10 bits (8B/10B) conversion. SOLUTION: The word stream data are provided by applying multiplexing processing to plural digital video signals or combination of plural digital video signals and bit adding signals, the 8B/10B conversion is applied to the word stream data provided by inserting additional word data group containing the word synchronizing data thereto, compound word stream data containing the word synchronizing data after the 8B/10B conversion, with which running disparity provided on the basis of the word synchronizing data is made positive or negative as determined beforehand, are formed and these data are converted to serial data and sent out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application relates to a method of combining a plurality of digital video signals or a combination of a plurality of digital video signals with a bit addition signal.
A multiplexing process is performed to obtain word string data, and the word string data is subjected to processing such as insertion of word synchronization data and 8-bit / 10-bit conversion to form composite word string data, which is converted into serial data. The present invention relates to a data transmission method for transmitting data after conversion and transmission, and a data transmission apparatus provided for implementing the method.

[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) processing and form 10 or 20 bit word string data. What is actually transmitted is parallel / serial conversion (P / S conversion) processing for converting 10- or 20-bit word string data formed by performing 8B / 10B conversion and further converting parallel data into serial data. And the serial data obtained.

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, so that a 10- or 20-bit word string is obtained. Data is formed, and the 10-bit or 20-bit word string data is converted into 8 bits every 10 bits, and the conversion is performed according to a previously prepared conversion table. 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.

[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. 13 is composed entirely 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,
When the 10-bit word string data is transmitted,
On the transmitting side, a "frame" in which a 10-bit word string data of a maximum of 2048 bytes is stored in the payload portion
Are formed, and are sequentially transmitted. On the receiving side, 10-bit word string data is extracted from the payload portion of each of a number of sequentially arriving "frames".

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) and 4fsc composite digital video signal (D2 signal). It has been known. The D1 signal, the D2 signal, and the like are, for example, a Y data sequence represented by 10-bit word string data representing a luminance signal component in a video signal and a C _B represented by 10-bit word string data representing a color difference signal component in a video signal. / _CR data sequence is subjected to word multiplexing processing, and a predetermined portion of the resulting word multiplexed data sequence is
Timing reference code data (SAV: Start of Activ
e Video and EAV: 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. 15 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.

The D1 signal forming the 10-bit word string data as shown in FIG. 15 is converted to serial data by P / S conversion processing and transmitted when transmitted. Then, on the receiving side, a portion based on SAV or EAV in the received serial data is detected, thereby performing S / P conversion processing under word synchronization 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, digital. Video camera, digital. In the field of business or home electronic devices such as video tape recorders, there is an increasing tendency to handle digital image information data (MPEG image information data) subjected to data compression by high-efficiency encoding according to MPEG. It is in. 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”.

[0017] Even in the signal format under the SDTI (SDTI signal format), timing reference code data is allocated during each line period as necessary. Then, S used for transmission of compressed digital video signal data or video and audio signal data is used.
A digital signal (SDTI signal) formed according to the DTI signal format is also converted from parallel data to serial data and transmitted in the form of a transmission signal that is an electric signal or an optical signal.

The D1 signal, D2 signal, SDT as described above
As for transmission of digital video signals such as I signals, as described above, word string data including word synchronization data is formed on the transmitting side based on the digital video signals to be transmitted, and the word string data is And 8B
The transmission system is subjected to a / 10B conversion process and further converted to serial data and transmitted. For example, an existing integrated circuit device (IC device) or the like is used in forming a transmission / reception circuit. Is desired from the viewpoint of effective use.

[0019]

As described above, on the transmitting side, word string data including word synchronization data is formed based on data to be transmitted, and the word string data is subjected to 8B / 10B conversion. A digital video signal such as a D1 signal, a D2 signal, an SDTI signal, and the like is desired to be transmitted in a transmission system which is processed and further converted into serial data and transmitted. In addition, if a plurality of digital video signals can be multiplexed and transmitted, the D1 signal,
Efficient use of digital video signals such as the D2 signal and SDTI signal is achieved, and the range of use is further expanded. And D1 signal, D2 signal, SD
Efficient use of a digital video signal such as a TI signal or expansion of a use range, for example, leads to further development of technology in the field of business or home electronic devices.

However, conventionally, on the transmission side, word string data to which word synchronization data is added is formed based on data to be transmitted, and the word string data is subjected to 8B / 10B conversion. In addition, a plurality of digital video signals such as a D1 signal, a D2 signal, an SDTI signal, etc. can be multiplex-transmitted by means of a transmission system which is converted into serial data and transmitted by means of a relatively easy arrangement. There is no concrete example that has realized a possible transmission system. Also, a document and the like describing a technique relating to a transmission system capable of multiplex transmission of digital video signals such as a plurality of D1 signals, D2 signals, SDTI signals, etc., in a relatively easy manner. Can not be found.

In view of the above, the invention described in the claims of the present application forms word string data to which word synchronization data is added based on data to be transmitted, and the word string data is The data is subjected to 8B / 10B conversion processing, and further converted to serial data and transmitted.
Provided is a data transmission method and a data transmission apparatus provided for implementing the method, which are capable of transmitting a plurality of digital video signals, such as two signals and an SDTI signal, by means that can be prepared relatively easily.

[0022]

A data transmission method according to one of the first to tenth aspects of the present invention provides a method for transmitting a plurality of digital video signals or a plurality of digital video signals. A multiplexing process is performed on the combination of the bit string and the bit addition signal to obtain word string data based on a plurality of digital video signals or a combination of the plurality of digital video signals and the bit addition signal. An additional word data group including word synchronization data having a predetermined code is inserted at word intervals, and 8B / 1 is added to the word string data into which the additional word data group is inserted.
A composite having a portion based on an additional word data group, including word synchronization data after 8B / 10B conversion in which RD obtained based on word synchronization data is subjected to a predetermined positive or negative value while performing 0B conversion processing. Word string data is formed, the composite word string data is converted to serial data, and the serial data is transmitted for transmission.

In particular, in the data transmission method according to the invention described in claim 4 of the present application, the combination of a plurality of digital video signals and bit addition signals
A digital video signal having a data format of 10-bit word string data of a channel and 2-bit additional data are formed. The word string data based on the digital video signal is converted to 16-bit word string data. Form a 16-bit word, and the composite word string data is converted to composite 20-bit word string data.

The data transmission apparatus according to the invention described in claim 11 or claim 12 in the claims of the present application is capable of transmitting a plurality of digital video signals or a combination of a plurality of digital video signals and a bit addition signal. A signal multiplexing means for performing multiplexing processing to obtain word string data based on a plurality of digital video signals or a combination of a plurality of digital video signals and bit addition signals; Data insertion means for inserting an additional word data group including word synchronization data having a preset code at a word interval, and 8B in the word string data into which the additional word data group obtained from the data insertion means is inserted. / 1
A composite having a portion based on an additional word data group, including word synchronization data after 8B / 10B conversion in which RD obtained based on word synchronization data is subjected to a predetermined positive or negative value while performing 0B conversion processing. Compound word string data forming means for forming word string data, and data sending means for converting compound word string data obtained from the compound word string data forming means into serial data and sending the serial data for transmission. It is configured with.

In particular, a data transmission apparatus according to the twelfth aspect of the present invention includes a digital video signal having a data format of 3-channel 10-bit word string data and 2-bit additional data. A signal multiplexing means for performing multiplexing processing on the combination to obtain 16-bit word string data, and additional word data in which word synchronization data forms a 16-bit word to 16-bit word string data obtained from the signal multiplexing means. Data insertion means for inserting a group, an 8B / 10B conversion process is performed on 16-bit word string data into which an additional word data group obtained from the data insertion means is inserted, and an RD obtained based on word synchronization data is predetermined. Including word sync data after 8B / 10B conversion to be positive or negative, Composite word string data forming means for forming compound 20 bit word string data having a portion based on the added word data group, and converting the compound 20 bit word string data obtained from the compound word string data forming means into serial data , Data transmission means for transmitting the serial data for transmission.

According to the data transmission method according to any one of the first to tenth aspects of the present invention as described above, for example, a plurality of D
The additional word data group insertion processing and the 8B / 10B conversion processing are performed based on a plurality of digital video signals such as one signal, D2 signal, SDTI signal, or a combination of the plurality of digital video signals and the bit addition signal. The composite word string data that is formed through the above process, converted into serial data, and sent out, includes word synchronization data that sets RD to a predetermined positive or negative value. Such word synchronization data is, for example, + K28.5 which is the word data DS10 whose RD is positive, or -K which is the word data DS10 whose RD is negative.
28.5.

Either the case where the receiving side detects the word synchronous data by detecting only the word synchronous data whose RD is positive, or the case where it detects only the word synchronous data whose RD is negative. Under the circumstances, on the receiving side, the word synchronization data in the compound word string data converted and transmitted to the serial data is used to reproduce a plurality of digital video signals or a plurality of digital video signals and a bit addition signal. Is properly detected as the word synchronization data required for the processing of. Also, the word string data included in the compound word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, reproduction of a plurality of digital video signals or a plurality of digital video signals and a bit addition signal based on the word string data received under the condition that good transmission quality is obtained;
A state in which the data synchronization state required for the processing for the data is reliably obtained.

According to the data transmission method according to any one of the first to tenth aspects of the present invention, the word synchronization in which the RD is set to a predetermined positive or negative value Conversion of compound word string data with additional word data group including data to serial data, transmission of the converted serial data, further reception of serial data on the receiving side, compound word string of received serial data Conversion to data and the like can be performed using, for example, a transmission circuit device used for transmitting and receiving digital video signals under a fiber channel system. Therefore, word string data to which word synchronization data is added based on data to be transmitted is formed, and the word string data is subjected to 8B / 10B conversion processing, further converted to serial data, and transmitted. For example, a plurality of D1 signals, D2 signals, SDTI
A plurality of digital video signals, such as signals, can be transmitted by means that can be arranged relatively easily.

In the data transmission device according to the invention described in claim 11 or claim 12 of the present application, the data transmission means converts the data into serial data and transmits the serial data. Based on a plurality of digital video signals such as a D1 signal, a D2 signal, an SDTI signal, or a combination of such a plurality of digital video signals and a bit addition signal, an additional word data group insertion process and an 8B / 10B conversion process are performed. The compound word string data formed through the above includes word synchronization data with RD set to a predetermined positive or negative value. Such word synchronization data is, for example, + K2 which is word data DS10 with RD being positive.
8.5 or word data DS1 with RD being negative
0, which is -K28.5.

When the receiving side detects the word synchronous data by detecting only the word synchronous data with RD being positive, or by detecting only the word synchronous data with RD being negative. In either case, on the receiving side, the word synchronization data in the compound word string data converted and transmitted to the serial data reproduces a plurality of digital video signals or a plurality of digital video signals and a bit addition signal. Is properly detected as the word synchronization data required for the processing for this. Also, the word string data included in the compound word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, for reproduction of a plurality of digital video signals or a plurality of digital video signals and bit addition signals based on the composite word string data received under the condition that good transmission quality is obtained. A state in which the data synchronization state required for the above processing is reliably obtained.

According to the data transmission apparatus of the present invention described in claim 11 or claim 12 of the present application, the RD includes word synchronization data having a predetermined positive or negative RD. Conversion of compound word string data with an additional word data group to serial data, transmission of converted serial data, and reception of serial data on the receiving side, conversion of received serial data to compound word string data For example,
This can be performed by using a transmission circuit device used for transmitting and receiving a digital video signal under a fiber channel system. Therefore, word string data to which word synchronization data is added based on data to be transmitted is formed, and the word string data is subjected to 8B / 10B conversion processing, further converted to serial data, and transmitted. With such a transmission method, a plurality of digital video signals such as a plurality of D1 signals, D2 signals, SDTI signals, etc., can be transmitted by means that can be prepared relatively easily.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention in which an example of a data transmission method according to any one of the first to tenth aspects of the present invention is implemented. Claim 11 or Claim 1 in the range of
2 shows an example of a data transmission device according to the invention described in No. 2.

In the example shown in FIG. 1, a three-channel D1 signal DVP which is a plurality of digital video signals
1, DVP2 and DVP3 and the bit addition signal 2
The bit addition data DAB (2) is supplied to the signal multiplexing unit 11. 3 channel D1 signals DVP1 to DVP3
Are digital signals forming 10-bit word string data in the form of a data sequence as shown in FIG. 15, for example, and are parallel data having a word transmission rate of, for example, 27 MBps. The 2-bit additional data DAB (2) is 2-bit word string data in which words of a 2-bit configuration are consecutive, and the word transmission rate is selected to be, for example, 27 MBps.

In the signal multiplexing unit 11, the phases of the line periods in each of the D1 signals DVP1 to DVP3 of the three channels are aligned, and the D1 signal D of the three channels is adjusted.
VP1 to DVP3 and 2-bit additional data DAB
Under the condition that bit synchronization with (2) is taken, 3
A multiplexing process is performed on a combination of the channel D1 signals DVP1 to DVP3 and the 2-bit additional data DAB (2),
As a result, the three-channel D1 signals DVP1 to DVP
16-bit word string data DU (16) is obtained based on a combination of 3 and 2-bit additional data DAB (2). In this case, each word (10 bits) and 2-bit additional data DAB in each of the three-channel D1 signals DVP1 to DVP3, which are simultaneously supplied to the signal multiplexing unit 11,
10 × in total with each word (2 bits) in (2)
By dividing 3 + 2 = 32 bits into two words of 16 bits each, the word transmission rate is increased to 27 MB.
16-bit word string data DU (16) with ps × 32/16 = 54 MBps is formed.

The 16-bit word string data DU (16) obtained from the signal multiplexing unit 11 is supplied to a speed conversion / data insertion unit 12. The speed conversion / data insertion unit 12 includes:
A clock pulse signal CA having a frequency of 27 MHz and a frequency of 55 MHz, synchronized with the respective word clock signals of the three channels of D1 signals DVP1 to DVP3.
, And an additional word data group DWS from the word data sending unit 13 is also supplied. Additional word data group DWS
Is composed of a plurality of 16-bit word data including 16-bit word synchronization data, and is parallel data having a word transmission rate of 55 MBps.

The rate conversion / data insertion unit 12 converts the word transmission rate from 54 MBps to 55 MBps for 16-bit word string data DU (16) having a word transmission rate of 54 MBps. And at predetermined word intervals,
A process of inserting an additional word data group DWS including 16-bit word synchronization data from the word data transmission unit 13 is performed. Thereby, the speed conversion / data insertion unit 1
2, the three-channel D1 signals DVP1 to DVP
Based on the combination of 3 and 2-bit additional data DAB (2), 16-bit word string data DZ (16) having an additional word data group DWS inserted and having a word transmission rate of 55 MBps is formed.

FIG. 2 shows a specific configuration example of the speed conversion / data insertion unit 12. In the example shown in FIG. 2, 16-bit word string data DU (1
6) is supplied to the switch 15. The switch 15 performs switching every predetermined period, for example, every 1 ms in response to the control signal CSA from the switch control signal forming unit 16, whereby the 16-bit word string data DU (1
6) are alternately supplied to the memory unit 17 and the memory unit 18 every 1 ms, and the 16-bit word string data DU (1
The distribution supply to the memory unit 17 and the memory unit 18 in 6) is performed.

A memory control signal forming unit 19 is provided in association with the memory unit 17 and the memory unit 18.
The memory control signal forming unit 19 includes a clock pulse signal C
A and CB are supplied. Then, based on the clock pulse signal CA, the memory control signal forming unit 19 sets the write control signal QW having a frequency of 27 MHz × 2 = 54 MHz.
, And generates a read control signal QR having a frequency of 55 MHz based on the clock pulse signal CB, and supplies the write control signal QW and the read control signal QR to both the memory units 17 and 18.

Thus, in the memory section 17, the 16-bit word string data DU (1
6), the 16-bit word string data DU (16) has a word transmission rate of 54 MBps according to the write control signal QW having a frequency of 54 MHz.
It is written in the state as follows. Also in the memory section 18, during the period in which the 16-bit word string data DU (16) is supplied through the switch 15, the 16-bit word string data DU (16) responds to the write control signal QW having a frequency of 54 MHz. And the word transmission rate is 54
It is written in the state of MBps. Therefore, the word transmission rate of the 16-bit word string data DU (16) in each of the memory unit 17 and the memory 18 is set to 54 MBps.
Is performed alternately for 1 ms in accordance with the switching of the switch 15 for every 1 ms.

The 16-bit word string data DU (16) written into the memory unit 17 for 1 ms is converted into a word in the next 1 ms according to a read control signal QR having a frequency of 55 MHz. Transmission rate of 55MBps
Is read from the memory unit 17 as 16-bit word string data MZ ′ (16), and supplied to the switch 20. The 16-bit word string data DU (16) written in the memory unit 18 for 1 ms also receives word transmission in the next 1 ms according to the read control signal QR having a frequency of 55 MHz. The data is read from the memory unit 18 as 16-bit word string data DZ ′ (16) having a rate of 55 MBps and supplied to the switch 20. The switch 20 is also supplied with an additional word data group DWS from the word data transmission unit 13 at a word transmission rate of 55 MBps.

The switch 20 responds to the control signal CSB from the switch control signal forming section 16 by adding an additional word data group DWS with a word transmission rate of 55 MBps from the word data transmission section 13 and a word transmission rate from the memory section 18. , And the 16-bit word string data DZ ′ (16) from the memory unit 17 having a word transmission rate of 55 MBps for each predetermined word period. Take out. Thereby, additional word data group DWS having a word transmission rate of 55 MBps is inserted from switch 20 into 16-bit word string data DZ '(16) having a word transmission rate of 55 MBps at predetermined word intervals. Then, 16-bit word string data DZ (16) into which the additional word data group is inserted is derived.

The additional word data group DWS having a word transmission rate of 55 MBps from the word data transmission unit 13 is constituted by a plurality of 16-bit word data including word synchronization data.
At least one 16-bit word data DEX8 formed by superimposing two pieces of bit word data DEX8 is arranged, followed by 8-bit word synchronization data DEK8 provided with a predetermined code and 8-bit auxiliary data. 16-bit word data DEK8 formed by superimposing word data DEA8: three or more consecutive DEA8s, and 16-bit word data formed by superimposing two arbitrary 8-bit word data DEX8 thereon DEX8: At least one DEX8 is configured in a row. Thus, in the additional word data group DWS, the 8-bit word synchronization data DEK8 is replaced with the 8-bit auxiliary word data DEA.
8 together with 16-bit word data DEK8: DEA8
Is formed.

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.

The 8-bit auxiliary word data DEA8
Is 8-bit word data represented as "01110101" as shown in FIG. 3. 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.

Further, arbitrary 8-bit word data DE
X8 becomes 10-bit word data DXX. X.

Such an additional word data group DW
16-bit word string data D formed by inserting S
Z (16) has a portion where the additional word data group DWS is inserted as shown in FIG. 4A.
In FIG. 4A, DD16 represents each 16-bit word data forming the 16-bit word string data DZ '(16) read from each of the memory units 17 and 18 shown in FIG.

The additional word data group DWS having a word transmission rate of 55 MBps from the word data transmitting section 13 has, for example, a code 8 in which a predetermined code is given to each of the start and end portions. Three or more 16-bit word data DEK8: DEA8 formed by superimposing the bit word synchronizing data DEK8 and the 8-bit auxiliary word data DEA8 are continuously arranged. In the part, the last 16-bit word data DEK in the starting end part
8: 8-bit word synchronization data DE forming DEA8
At least one 16-bit word data, which inverts the RD of the 8-bit word synchronization data DEK8 forming the first 16-bit word data DEK8: DEA8 in the terminal side, is arranged for the RD of K8. It is assumed. Even in such a case, in the additional word data group DWS, the 8-bit word synchronization data DEK8 is replaced with the 8-bit auxiliary word data DEA8.
At the same time, 16-bit word data DEK8: DEA8 is formed.

Such an additional word data group DW
16-bit word string data D formed by inserting S
Z (16) has a portion where the additional word data group DWS is inserted, as shown in FIG. 5A.
In FIG. 5A as well, DD16 represents each 16-bit word data forming the 16-bit word string data DZ '(16) read from each of the memory units 17 and 18 shown in FIG.

In addition to the above, the additional word data group DWS whose word transmission rate from the word data transmission unit 13 is 55 MBps is different from the above-mentioned example.
16-bit word data DEX formed by superimposing
8: 8-bit word synchronization data DE provided with a predetermined number of DEX8 and a predetermined code
16-bit word data DEK8: DE formed by superimposing K8 and arbitrary 8-bit word data DEX8
X8 is subsequently configured. In the case of such an additional word data group DWS, the 8-bit word synchronization data DEK8 is an arbitrary 8-bit word data DEK.
16 bit word data DEK8: DEX together with X8
8 are formed.

Such an additional word data group DW
16-bit word string data D formed by inserting S
Z (16) is such that the portion where the additional word data group DWS is inserted is as shown in FIG. 6A.
Also in FIG. 6A, DD16 represents each 16-bit word data forming the 16-bit word string data DZ '(16) read from each of the memory units 17 and 18 shown in FIG.

Further, as another example, an additional word data group DWS with a word transmission rate of 55 MBps from the word data transmission unit 13 is, for example, an 8-bit word synchronization provided with a first predetermined code. Data DEK8 and arbitrary 8-bit word data DEX
And 16-bit word data D formed by superimposing
EK8: An arbitrary 8-bit word data DE is stored in DEX8.
16-bit word data DEX8 formed by superimposing two X8s, a predetermined number of 16-bit word data DEX8 followed by a second predetermined code, 8-bit word synchronizing data DEK8 and arbitrary 8-bit word data DEX
And 16-bit word data D formed by superimposing
EK8: DEX8 is configured subsequently. Also in the case of such an additional word data group DWS, the 8-bit word synchronization data DEK8, together with the arbitrary 8-bit word data DEX8, and the 16-bit word data DEK8
K8: It forms DEX8.

Such an additional word data group DW
16-bit word string data D formed by inserting S
Z (16) has a portion where the additional word data group DWS is inserted as shown in FIG. 7A.
In FIG. 7A as well, DD16 represents each 16-bit word data forming the 16-bit word string data DZ '(16) read from each of the memory units 17 and 18 shown in FIG.

The 16-bit word string data DZ (16) formed by the speed conversion / data insertion unit 12 and having the word transmission rate of 55 MBps and having the additional word data group DWS inserted therein is subjected to 8B / 10B conversion / 20 conversion.
It is supplied to the bit word string data forming unit 21. 8B /
In the 10B conversion / 20-bit word string data forming unit 21, first, 8B is added to the 16-bit word string data DZ (16) into which the additional word data group DWS is inserted.
/ 10B conversion processing is performed. Such an 8B / 10B conversion process is performed in a 16-bit format in which the additional word data group DWS is inserted.
For the bit word string data DZ (16), the 16 bits forming each word are divided into two bit groups of 8 bits each, thereby dividing the data into 8 bit units. Is sequentially converted into 10-bit data according to a conversion table prepared in advance. Then, 8B / 10B conversion
In the 20-bit word string data forming unit 21, 8B
The 10-bit data sequentially obtained by the / 10B conversion processing is derived by superimposing two pieces of data at a time, and the word transmission rate is 55
Composite 20-bit word string data DZ with MBps
Form (20).

As described above, the 8B / 10B conversion / 20-bit word string data forming unit 21 performs the 8B / 10B conversion processing on the 16-bit word string data DZ (16) into which the additional word data group DWS is inserted. At the same time, when composite 20-bit word string data DZ (20) is formed, 16-bit word string data DZ (1
The 16-bit word data DD16 included in 6) is converted into 20-bit word data DD20. At the same time, in the part of the additional word data group DWS inserted into the 16-bit word string data DZ (16),
16-bit word data DEX8: DEX8 is 10-bit word data DX obtained by converting arbitrary 8-bit word data DEX8 into 10-bit word data
X. X and 20-bit word data DXX. X: DXX. X is converted to X, and 16-bit word data DEK8: DEA8 is K28.5, which is 10-bit word synchronization data obtained by converting 8-bit word synchronization data DEK8 to 10-bit word data.
And K21.3, which is 10-bit auxiliary word data obtained by converting 8-bit auxiliary word data DEA8 into 10-bit word data, is obtained by superimposing 20.
It is converted to bit word data K28.5: K21.3, and further converted to 16-bit word data DEK8: DEX.
8 is K28.5, which is 10-bit word synchronization data obtained by converting 8-bit word synchronization data DEK8 into 10-bit word data, and is obtained by converting arbitrary 8-bit word data DEX8 into 10-bit word data. 10-bit word data DXX. 20 bit word data K28.5: DX obtained by superimposing X
X. Converted to X.

Therefore, 16-bit word string data DZ
Additional word data group DWS inserted in (16)
Is as shown in FIG. 4A, the composite 2
In the 0-bit word string data DZ (20), the portion based on the additional word data group DWS in the 0-bit word string data DZ (20) is the 20-bit word data DXX. X: DXX. 10-bit word data DX in which K28.5 in X continues
X. When the RD of X is negative (-), it is as shown in FIG. 4B, while the first 20-bit word data K
28.5: 20-bit word data DXX. X: DXX. 1 where K28.5 in X continues
0-bit word data DXX. When the RD of X is positive (+), it is as shown in FIG. 4C.

The 16-bit word string data DZ (1
The additional word data group DWS inserted in 6) is
When the composite 20-bit word string data DZ (20) is as shown in FIG. 5A, the portion based on the additional word data group DWS is the first 2 bits.
0-bit word data K28.5: When the RD of 10-bit word data to which K28.5 continues in the 20-bit word data DD20 immediately before K21.3 is negative (-), the result is as shown in FIG. 5B. , While the first 20
Bit word data K28.5: 2 immediately before K21.3
When the RD of the 10-bit word data to which K28.5 in the 0-bit word data DD20 is continuous is positive (+), the result is as shown in FIG. 5C.

Further, 16-bit word string data DZ
Additional word data group DWS inserted in (16)
Is as shown in FIG. 6A or FIG. 7A, in the 8B / 10B conversion / 20-bit word string data forming unit 21, the 16-bit word string data into which the additional word data group DWS is inserted. DZ (1
When performing 8B / 10B conversion processing in 6), immediately before K28.5, which is 10-bit word synchronization data obtained by performing 8-B / 10B conversion on 8-bit word synchronization data DEK8, set RD to negative (-) (or Perform the operation to set to positive (+).

Thus, 16-bit word string data D
Z (16) additional word data group DW inserted
When S is as shown in FIG. 6A, the composite 20-bit word string data DZ (20) has a portion based on the additional word data group DWS, as shown in FIG. 6B. 20-bit word data K at
28.5: DXX. K28.5 forming X is set to +28.5 where RD is positive (+) (or −28.5 where RD is negative (−)). When the additional word data group DWS inserted into the 16-bit word string data DZ (16) is as shown in FIG. 7A, the composite 20-bit word string data DZ (20) As shown in FIG. 7B, the portion based on the word data group DWS is the 20-bit word data K28.5: DXX. K28.5 forming X is set to +28.5 where RD is positive (+) (or −28.5 where RD is negative (−)).

Under the above conditions, 8B / 10B conversion
The composite 20-bit word string data DZ (20) having a word transmission rate of 55 MBps formed by the 20-bit word string data forming section 21 is sent from the 8B / 10B conversion / 20-bit word string data forming section 21, It is supplied to the P / S converter 22. P / S converter 22
, The composite 20-bit word string data DZ (2
0) is subjected to P / S conversion, and the bit transmission rate based on the composite 20-bit word string data DZ (20) is 55M.
Serial data D with Bps × 20 = 1.1 Gbps
ZS, and transmits the serial data DZS to the transmitting unit 23.
To supply. The transmission unit 23 converts the serial data DZS into
For example, in order to transmit through a data transmission line formed using optical fiber,
The optical signal is transmitted as an optical signal SZ suitable for a data transmission path formed using a fiber. Thereby, transmission of the serial data DZS is performed.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S conversion section 22 and the transmission section 23 transmit the composite 20-bit word string data DZ (20) having a word transmission rate of 55 MBps. Bit transmission rate 1.1
A data transmission unit that converts the data into serial data DZS of Gbps and transmits the data for transmission is configured. Then, the P / S conversion unit 22 and the transmission unit 2 constituting such a data transmission unit
For example, the device 3 can be configured by effectively using an integrated circuit (IC) element provided for transmitting a digital video signal under a fiber channel system. Therefore, word string data to which word synchronization data is added based on data to be transmitted is formed, and the word string data is added to 8B / 10
B conversion processing is performed, and furthermore, the transmission system is converted into serial data and transmitted, and the D1 of three channels is used.
Each of signals DVP1 to DVP3 and 2-bit additional data D
AB (2) can be multiplex-transmitted by means that can be arranged relatively easily.

FIG. 8 shows composite 20-bit word string data DZ transmitted from the transmission unit 23 in the data transmission apparatus shown in FIG. 1 according to an example of the data transmission method according to the invention described in the claims of the present application. The optical signal S based on the serial data DZS obtained by converting (20)
1 shows an example of a data receiving device that receives Z.

In the example of the data receiving apparatus shown in FIG. 8, for example, there is provided a receiving section 25 for receiving an optical signal SZ transmitted through a data transmission line formed using an optical fiber. ing. Receiver 2
5, when receiving the optical signal SZ, the received optical signal S
The serial data DZS based on Z is reproduced, and the reproduced serial data DZS is supplied to the synchronous data detection / S / P converter 26.

In the synchronous data detection / S / P converter 26, the 20-bit word data K28.5: K21.3 or K28.5 in the serial data DZS:
DXX. + K28.5 forming X or the like (or -K2
8.5) is detected as a part of the converted serial data as synchronous data, word synchronization is performed based on the detected synchronous data, S / P conversion is performed on the serial data DZS, and A or C in FIG. , FIG. 10A or C, FIG. 11A or FIG. 12A, for example, compound 20-bit word string data DZ (20) which is parallel data having a word transmission rate of 55 MBps.
To form The composite 20 shown in FIG. 9A or C, FIG. 10A or C, FIG. 11A or FIG.
Bit word string data DZ (20) is selectively formed according to the contents of additional word data group DWS.
The composite 20-bit word string data DZ (20) obtained from the synchronous data detection / S / P converter 26 is
The data is supplied to the B / 8B conversion / 16-bit word string data forming unit 27.

The synchronous data detection / S / P converter 26
, The composite 20-bit word string data DZ (2
+ K in the additional word data group DWS in 0)
20-bit word data K28.5 including 28.5 (or -K28.5): K21.3 or K28.
5: DXX. X is detected and the K28.5 detection output signal S is detected.
Send WS. This K28.5 detection output signal SWS
According to the contents of the additional word data group DWS in the composite 20-bit word string data DZ (20), for example, B or D in FIG. 9, B or D in FIG. 10, B or D in FIG. Obtained as shown. Thus, the synchronous data detection / S / P converter 2
The K28.5 detection output signal SWS obtained from 6 is supplied to the control signal forming unit 28. In the control signal forming section 28, a synchronization control signal CW based on the K28.5 detection output signal SWS is formed.

The 10B / 8B conversion / 16-bit word string data forming section 27 to which the composite 20-bit word string data DZ (20) is supplied from the synchronous data detecting / S / P converting section 26 has a control signal forming section 28. Control signal CW from
Is also supplied. In the 10B / 8B conversion / 16-bit word string data forming unit 27, first, under the control of synchronization by the synchronization control signal CW, the 10B / 8B conversion processing is performed on the composite 20-bit word string data DZ (20). Is applied. Such 10B / 8B conversion processing is a complex 2
For the 0-bit word string data DZ (20), the 20 bits forming each word are divided into two 10-bit bit groups, thereby dividing the data into 10-bit groups. Each of them is sequentially converted into 8-bit data according to a conversion table prepared in advance. Next, 10B / 8B
In the conversion / 16-bit word string data forming unit 26, 8-bit data sequentially obtained by the 10B / 8B conversion processing is superimposed and derived two by two, and the word transmission rate is set to 55 MBps.
Form (16).

As described above, in the 10B / 8B conversion / 16-bit word string data forming section 27, the composite 20-bit word string data DZ (20) is subjected to the 10B / 8B conversion processing and the 16-bit word string data DZ (1
6) is formed, the 20-bit word data D included in the composite 20-bit word string data DZ (20)
D20 is converted to 16-bit word data DD16. At the same time, the composite 20-bit word string data DZ
Additional word data group DWS inserted in (20)
, The 20-bit word data DXX. X:
DXX. X is 16-bit word data DEX8: DE
Converted to X8, and 20-bit word data K28.5:
K21.3 is 16-bit word data DEK8: DE
A8, and further converted to 20-bit word data K2
8.5: DXX. X is 16-bit word data DEK
8: Converted to DEX8. As a result, the 16-bit word string data DZ (16) obtained in the 10B / 8B conversion / 16-bit word string data forming section 27 is converted into the above-described A in FIG. 4, A in FIG. 5, A in FIG. 6, or A in FIG. A corresponds to the composite 16-bit word string data DZ (16) shown in FIG.

16-bit word string data DZ from 10B / 8B conversion / 16-bit word string data forming section 27
(16) is supplied to the word data separation / speed conversion unit 29. The word data separation / speed conversion unit 29 is also supplied with the synchronization control signal CW from the control signal forming unit 28.
Then, in the word data separation / speed conversion unit 29, the 16-bit word sequence data DZ (16) is converted from the 16-bit word sequence data DZ (16) to a word transmission rate of 55 MBps under the synchronization control by the synchronization control signal CW. DZ '(16) and additional word data group DW
16-bit word data DEX8: DEX forming S
8, DEK8: DEA8, DEK8: DEX8, etc. are separated and taken out.

Further, a word data separation / speed conversion unit 2
9, the 16-bit word string data DZ (16)
16-bit word string data DZ ′ (1
6) Change the word transmission rate from 55 MBps to 54 MB
16-bit word string data D that is subjected to a speed conversion process for converting the
U (16) is formed. As a result, the word transmission rate is set to 55 MB from the word data separation / speed conversion unit 29.
The additional word data group DWS of ps and the 16-bit word sequence data DU (16) of 54 MBps are transmitted, and the 16-bit word sequence data DU (16) is supplied to the data separation unit 30.

In the data separating section 30, 32 bits forming two consecutive words of 16-bit word string data DU (16) having a word transmission rate of 54 MBps are divided into three groups of 10 bits and 2 bits. , The state in which each of the three groups of 10 bits and 2 bits is individually derived is continued. As a result, based on the 16-bit word string data DU (16),
Each has a word transmission rate of 54 MBps / 2 = 27 MB
3 bits of parallel data forming a 10-bit word string data having a ps and a word transmission rate of 54M
3-channel D1 signals DVP1 and DVP, which are 2-bit word string data with Bps / 2 = 27 MBps
2 and DVP3 and the bit addition signal DAB (2) are formed separately from each other. Thereby, the reproduced D1 signal DVP of three channels is output from the data separation unit 30.
1, DVP2 and DVP3 and bit addition signal DAB
(2) is derived.

In this manner, the three-channel D1 signal DVP1 each having a word transmission rate of 27 MBps
.. DVP3 and the bit addition signal DAB (2) are reproduced.

An example of the data transmission method according to the invention described in any one of claims 1 to 10 in the above-described claims of the present application is shown in FIG. The digital video signal supplied to the signal multiplexing unit 11 in the example of the data transmission apparatus according to claim 11 or 12, that is, the digital video signal to be transmitted is a three-channel D
One signal is combined with the bit addition signal DAB (2). However, the data transmission method according to any one of claims 1 to 10 in the claims of the present application and the invention described in claim 11 or 12 in the claims of the present application In the data transmission apparatus according to the above, the digital video signal to be transmitted need not be limited to the D1 signal.
It may be a digital video signal other than the D1 signal such as the I signal, and the combination with the bit addition signal such as the bit addition signal DAB (2) is not necessarily required. Further, the number of channels of the digital video signal to be transmitted is not limited to three, but can be any number.

[0072]

As is apparent from the above description, in the data transmission method according to any one of the first to tenth aspects of the present invention, for example, Based on a plurality of digital video signals such as a D1 signal, a D2 signal, an SDTI signal, or a combination of such a plurality of digital video signals and a bit addition signal, additional word data group insertion processing and 8
The composite word string data formed through the B / 10B conversion process, converted into serial data, and sent out, includes word synchronization data having a predetermined positive or negative RD.

The word synchronization data in the compound word string data converted and transmitted to the serial data is received by the receiving side receiving the serial data based on the compound word string data including the word synchronization data detection and RD. Regardless of whether the detection is performed by detecting only the word synchronization data having a positive value or only the word synchronization data having a negative RD, a plurality of digital video It is to be properly detected as word synchronization data required for processing for reproducing a signal or a plurality of digital video signals and bit addition signals. The word string data included in the compound word string data is
Good transmission quality is obtained by being obtained through the 8B / 10B conversion processing. Therefore, on the receiving side, for reproducing a plurality of digital video signals or a plurality of digital video signals and bit addition signals based on the word string data received under the condition that good transmission quality is obtained. A state in which the data synchronization state required for processing is reliably obtained.

According to the data transmission method according to any one of the first to tenth aspects of the present invention, RD is set to a predetermined positive or negative value. Conversion of composite word string data with an additional word data group including word synchronization data to serial data, transmission of the converted serial data, and reception of serial data at the receiving side, and composite of received serial data Conversion to word string data and the like can be performed using, for example, a transmission circuit device used for transmitting and receiving digital video signals under a fiber channel system. Therefore, word string data to which word synchronization data is added based on data to be transmitted is formed, and the word string data is subjected to 8B / 10B conversion processing, further converted to serial data, and transmitted. For example, a plurality of D1 signals, D2 signals,
A plurality of digital video signals, such as SDTI signals, can be transmitted by means that can be prepared relatively easily.

Further, in the data transmission apparatus according to the invention described in claim 11 or claim 12 of the present application, the data transmission means converts the data into serial data and transmits the serial data. Based on a plurality of digital video signals such as a D1 signal, a D2 signal, an SDTI signal, or a combination of such a plurality of digital video signals and a bit addition signal, an additional word data group insertion process and an 8B / 10B conversion process are performed. The compound word string data formed through the above includes word synchronization data with RD set to a predetermined positive or negative value.

The word synchronizing data in the compound word string data converted and transmitted to the serial data is converted into a word synchronizing data by the receiving side receiving the serial data based on the compound word string data including the word synchronizing data. Regardless of whether the detection is performed by detecting only the word synchronization data having a positive value or only the word synchronization data having a negative RD, the reception side converts the data into serial data. The word synchronization data in the compound word string data transmitted and transmitted is properly used as word synchronization data required for processing for reproducing a plurality of digital video signals or a plurality of digital video signals and bit addition signals. It is to be detected. Also, the word string data included in the compound word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side,
A data synchronization state required for processing for reproducing a plurality of digital video signals or a plurality of digital video signals and bit addition signals based on composite word string data received with good transmission quality. Is ensured.

According to the data transmission apparatus of the present invention described in claim 11 or claim 12 of the present application, the RD includes word synchronization data having a predetermined positive or negative RD. Conversion of compound word string data with an additional word data group to serial data, transmission of converted serial data, and reception of serial data on the receiving side, conversion of received serial data to compound word string data For example,
This can be performed by using a transmission circuit device used for transmitting and receiving a digital video signal under a fiber channel system. Therefore, word string data to which word synchronization data is added based on data to be transmitted is formed, and the word string data is subjected to 8B / 10B conversion processing, further converted to serial data, and transmitted. With such a transmission method, a plurality of digital video signals such as a plurality of D1 signals, D2 signals, SDTI signals, etc., can be transmitted by means that can be prepared relatively easily.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a data transmission method according to the present invention; FIG. 13 is a block diagram showing an example of a data transmission device according to the invention described in claim 12.

FIG. 2 is a block diagram showing a specific configuration example of a rate conversion / data insertion unit in the data transmission device shown in FIG. 1;

FIG. 3 is a conceptual diagram for explaining 8-bit auxiliary word data used in an example of the data transmission method according to any one of claims 1 to 10 in the claims of the present application. It is.

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 10 in the claims of the present application.

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 10 in the claims of the present application.

FIG. 6 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 10 in the claims of the present application.

FIG. 7 is a time chart for explaining an example of a data transmission method according to any one of the first to tenth aspects of the present invention.

FIG. 8 shows an example of a data receiving apparatus for receiving an optical signal transmitted according to an example of the data transmission method according to any one of the first to tenth aspects of the present invention. It is a block block diagram.

FIG. 9 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 8;

FIG. 10 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 8;

FIG. 11 is a time chart used for describing the operation of the data receiving device shown in FIG. 8;

FIG. 12 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 8;

FIG. 13 is a conceptual diagram explaining a “frame” used in transmitting digital data.

FIG. 14 is a conceptual diagram serving to explain word synchronization data used in transmitting digital data.

FIG. 15 is a conceptual diagram explaining an example of a data format of a digital video signal.

[Explanation of symbols]

11: signal multiplexing unit, 12: speed conversion / data insertion unit, 13: word data transmission unit, 15, 2
0: switch, 16: switch control signal forming unit, 17, 18: memory unit, 19: memory control signal forming unit, 21: 8B / 10B conversion / 20
Bit word string data forming unit, 22 ... P / S conversion unit, 23 ... Transmission unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/081 H04N 7/133 Z 7/30 F term (Reference) 5C059 KK00 LA01 MA00 PP04 RA01 RB01 RB02 RB19 RC02 RD03 RE01 UA02 UA05 UA32 5C063 AA01 AB03 AC01 AC05 CA34 DA07 EB01 EB09 5K028 AA11 BB08 EE03 KK01 MM16 NN47 SS06 5K029 AA00 CC04 DD02 EE06 EE18 GG03 GG07 5K047 AA02 BB02 CC02 DD02

Claims (12)

[Claims] A multiplexing process is performed on a plurality of digital video signals or a combination of a plurality of digital video signals and bit addition signals, and a combination of the plurality of digital video signals or a combination of a plurality of digital video signals and bit addition signals is provided. And an additional word data group including word synchronization data having a preset code is inserted into the word string data at predetermined word intervals, and the additional word data group The inserted word string data is subjected to an 8-bit / 10-bit conversion process, and the word after the 8-bit / 10-bit conversion is performed in which the running disparity obtained based on the word synchronization data is set to a predetermined positive or negative value. There is a part based on the above-mentioned additional word data group including the synchronization data. Composite word sequence data to form, by converting the composite word sequence data to serial data, the data transmission method for sending in order to transmit the serial data. 2. Each of a plurality of digital video signals is
2. The data transmission method according to claim 1, wherein the signal has a data format of bit word string data. 3. A combination of a plurality of digital video signals and a bit addition signal is formed by a digital video signal having a data format of 3-channel 10-bit word string data and 2-bit additional data. Item 3. The data transmission method according to Item 2. 4. A word string data based on a plurality of digital video signals or a combination of a plurality of digital video signals and a bit addition signal is defined as 16-bit word string data.
When the additional word data group contains 16
4. The data transmission method according to claim 3, wherein bit words are formed, and the compound word string data is compound 20 bit word string data. 5. A method according to claim 1, wherein the additional word data group is based on the additional word data group in the composite word string data and includes word synchronous data after 8 bit / 10 bit conversion with a positive running disparity. The data transmission method according to claim 1, wherein the data transmission method is selected. 6. A method according to claim 1, wherein the additional word data group is based on the additional word data group in the composite word string data, and includes word synchronous data after 8 bits / 10 bits conversion with negative running disparity. The data transmission method according to claim 1, wherein the data transmission method is selected. 7. The method according to claim 1, wherein the additional word data group includes auxiliary word data, and the auxiliary word data is selected so that the running disparity is neutral after 8 bits / 10 bits conversion. The data transmission method according to any one of claims 1 to 6. 8. The additional word data group is selected such that three or more combinations of word synchronization data and auxiliary word data continue.
Data transmission method as described. 9. When performing 8-bit / 10-bit conversion processing on word string data into which an additional word data group has been inserted, the running disparity becomes negative immediately before the word synchronization data after the 8-bit / 10-bit conversion. The data transmission method according to any one of claims 1 to 4, wherein the data transmission is set. 10. When performing 8-bit / 10-bit conversion processing on word string data into which an additional word data group has been inserted, the running disparity is set to be positive immediately before the word synchronization data after the 8-bit / 10-bit conversion. The data transmission method according to any one of claims 1 to 4, wherein the data transmission is set. 11. A multiplexing process for a plurality of digital video signals or a combination of a plurality of digital video signals and bit addition signals, and a combination of the plurality of digital video signals or a plurality of digital video signals and bit addition signals. Signal multiplexing means for obtaining word string data based on the following. An additional word data group including word synchronization data having a preset code is provided at predetermined word intervals in the word string data obtained from the signal multiplexing means. Data insertion means to be inserted; and 8 bit / 10 bit conversion processing to the word string data into which the additional word data group obtained from the data insertion means has been inserted, and a running disk obtained based on the word synchronization data. 8 bits / 10 bits with a predetermined positive or negative parity Compound word string data forming means for forming compound word string data having a portion based on the additional word data group including the word synchronization data after the conversion, and a compound word string obtained from the compound word string data forming means A data transmission unit configured to convert data into serial data and transmit the serial data for transmission. 12. A signal multiplexing means for multiplexing a combination of a digital video signal having a data format of 3-channel 10-bit word string data and 2-bit additional data to obtain 16-bit word string data. The data insertion means inserts an additional word data group whose word synchronization data forms a 16-bit word into the 16-bit word string data obtained from the signal multiplexing means; The data forming means performs an 8-bit / 10-bit conversion process on the 16-bit word string data into which the additional word data group obtained from the data inserting means has been inserted, and also executes a running distortion obtained based on the word synchronization data. 8-bit / 10-bit conversion with a predetermined positive or negative parity Containing the word synchronization data, the composite 2 having a portion based on the additional word data group
The data transmission means converts the composite 20-bit word string data obtained from the composite word string data formation means into serial data, and transmits the serial data for transmission. The data transmission device according to claim 11, wherein