JP2001016280A - Method and device for transmitting data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To comparatively easily arrange the transmission of 10-bit word train data by changing compound 10-bit word train data having a part based on an additional word data group, which includes a 10-bit reference word, into serial data and transmitting them. SOLUTION: Four pieces of 10-bit word train data DV(10)A to D are supplied to four 10-bit/8-bit converting parts 11A-11D, for example. Then, 10-bit word train data expressing signal information are converted to 8-bit word train data and corresponding to a timing signal, the additional word data group including the reference word data is arranged in the 8-bit word train data. The conversion of these 8-bit word train data to 10-bit word train data is performed and compound 10-bit word train data having a part based on the additional word data group including the 10-bit reference word based on the reference word data are provided. Then, these data are changed into 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 relates to a data transmission for transmitting 10-bit word string data representing signal information such as video signal information to a data transmission path for transmission as serial data. Method and apparatus.

[0002]

2. Description of the Related Art As one mode of transmission of digital data representing various kinds of signal information such as video signal information, digital data is transmitted as an electric signal through a transmission line formed using a coaxial cable or a twisted pair. There has been proposed a system or an optical transmission system for converting digital data into an optical signal and transmitting the optical signal through a transmission line formed using an optical fiber. Digital data handled under such a digital transmission system is, for example, serial data having a bit rate of about several hundred Mbps to 2 Gbps.

As one of such digital transmission systems, for example, a fiber channel system (Fi
bre Channel System) is known.
Under a digital transmission system such as this fiber channel system, on the transmission side, digital data to be transmitted is converted into 10 bits for every 8 bits. Bit conversion (8B / 10B conversion) is performed to obtain 10-bit word string data. Then, what is actually transmitted to the transmission path and transmitted is the serial data obtained by further performing a parallel / serial conversion (P / S conversion) process on the 10-bit word string data thus formed. It is said.

On the other hand, on the receiving side, serial / parallel conversion (S / P conversion) is performed on received serial data.
Conversion) processing is performed to form 10-bit word string data, and the 10-bit word string data is subjected to 10-bit / 8-bit conversion (10B / 8B conversion) in which conversion is performed for every 10 bits to 8 bits. Is done. And 10B /
The original digital data is reproduced from the word string data formed by performing the 8B conversion.

In such a case, each of the words of 10-bit structure in the 10-bit word string data transmitted as serial data on the transmission side on the transmission side is divided into 6 bits and 4 bits. The number of “1” is greater than the number of “0”, 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 such states of the numbers “1” and “0”, for example, the concept of running disparity (Running Disparity: RD) is introduced, and the number of “1” is “0”. When more than the number, the running disparity (RD) is said to be positive,
Also, when the number of “0” is larger than the number of “1”, RD is said to be negative, and when the number of “1” is equal to the number of “0”, RD is neutral. . And
Word data in which the number of “1” s is larger than “0” is word data with RD being positive, word data in which the number of “0” is larger than “1” is word data with RD being negative, and “1”. "
Is equal to the number of "0" is called word data (neutral word data) with RD as neutral.

[0006] Also, 10B / 8 performed on the receiving side.
In order for the B conversion to be proper,
It is necessary to accurately grasp each of the 10 bits formed by the B / 10B conversion. For this reason, on the transmission side, 10-bit word string data converted to serial data and transmitted is inserted with reference word data as appropriate. It is assumed that. The reference word 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. And the reference word data is
At the time of insertion, when the immediately preceding word data has RD negative, RD is made positive, and when the immediately preceding word data has RD positive, RD is made negative. It shall be.

[0007] Such reference word data is, for example,
It is word data DS (10) having a 10-bit configuration called a code name of K28.5. FIG.
The word data DS (10) having a 10-bit configuration called by a code name of 8.5 is shown.
S (10) is a code “001111 1010” that makes RD positive when the CRD, which is the RD based on the word data placed immediately before, is negative (−). When the CRD that is the RD according to the above is positive (+), the code “11000
0 0101 ".

On the other hand, in the field of video signals, digitization has been attempted from the viewpoint of diversifying transmitted information and improving the quality of reproduced images, and various digital video signals have been proposed. These digital video signals are, for example, "SMPT" which is a standard established by SMPTE (Movie and Television Engineers Association) of the United States.
Most of them are formed as 10-bit word string data, such as digital video signals according to E 125M or SMPTE 259M.

A digital video signal formed as such 10-bit word string data, for example, in accordance with “SMPTE 125M” or “SMPTE 259M” often has a word transmission rate of several tens MB.
Therefore, when multiplexing a plurality of digital video signals, that is, a plurality of channels of digital video signals, is to be transmitted, a plurality of 10-bit digital video signals each provided for actual transmission are provided. Serial data obtained by subjecting multiplexed 10-bit word string data formed by multiplexing word string data to P / S conversion has an extremely high bit transmission speed. For example, a 10-bit word string data which is a digital video signal has a word transmission speed of 27 MB.
When multiplexing four 10-bit word string data for transmission under the condition of ps, the serial data used for actual transmission has a bit transmission speed of 27 MBps ×
10 × 4 = 1.08 Gbps, and
When multiplexing five 10-bit word string data for transmission, the serial data used for actual transmission has a bit transmission rate of 27 MBps × 10 × 5 = 1.
The transmission speed is set to 35 Gbps, and each bit transmission speed is extremely high.

[0010]

As described above, for example, when multiplexing and transmitting a plurality of 10-bit word string data, each of which is a digital video signal, the serial data provided for actual transmission is used. It is assumed that the data has a very high bit transmission rate, and therefore, for example, a circuit element including a P / S conversion unit capable of handling serial data having a very high bit transmission rate and an S / P
Circuit elements and the like including the conversion unit are required. However, development of a circuit element including a new P / S converter and a circuit element including an S / P converter that can handle serial data having such an extremely high bit transmission rate requires a great deal of time and cost. Will be spent.

Therefore, when multiplexing and transmitting a plurality of 10-bit word string data, each of which is a digital video signal, it is used for digital data transmission by the above-mentioned fiber channel system which is already in practical use. Integrated circuit (I / O) constituting a circuit element including a P / S converter, a circuit element including an S / P converter, and the like.
C) If elements and the like can be used, a great deal of time and cost can be saved for the development of a circuit element including a new P / S converter and a circuit element including an S / P conversion. Multiplexed transmission of a plurality of 10-bit word string data, which is a digital video signal, can be performed by means that can be prepared relatively easily. However, the circuit elements including the P / S converter and the circuit elements including the S / P converter used for digital data transmission by the above-mentioned fiber channel system convert 8-bit word string data into input data and output data. Therefore, it cannot be used for multiplexing and transmitting 10-bit word string data.

[0012] In view of the above, the invention described in the claims of the present application discloses a method for independently using 10-bit word string data representing signal information such as video signal information.
Alternatively, the present invention is applied to a data transmission method and a data transmission method capable of performing transmission by multiplexing a plurality of them by means that can be arranged relatively easily without developing new circuit elements and the like. A data transmission device is provided.

[0013]

According to a first aspect of the present invention, there is provided a data transmission method according to the first aspect of the present invention, which represents signal information.
The 0-bit word string data is converted to 8-bit word string data, and the 8-bit word string data is converted into 8-bit word string data, each of which has a preset code, in accordance with a predetermined timing signal. An additional word data group including the additional word data group is arranged.
Conversion to bit word string data is performed to obtain composite 10-bit word string data having a portion based on an additional word data group including 10-bit reference word data based on the reference word data. The data is changed to serial data and transmitted for transmission.

The data transmission method according to the invention described in any one of claims 5 to 8 in the claims of the present application provides a method of transmitting a plurality of 10-bit words each representing signal information. Converting each of the column data into 8-bit word sequence data to obtain a plurality of 8-bit word sequence data, performing multiplexing processing on the plurality of 8-bit word sequence data to form multiplexed 8-bit word sequence data; In response to a predetermined timing signal, the multiplexed 8-bit word string data has 8 codes each having a preset code.
An additional word data group including the reference word data as the bit word data is arranged, and the multiplexed 8-bit word string data in which the additional word data group is arranged is converted into 10-bit word string data to obtain a reference word. Obtaining composite 10-bit word string data having a portion based on an additional word data group including 10-bit reference word data based on the data, converting the composite 10-bit word string data into serial data, and transmitting it for transmission; It is assumed.

According to a ninth aspect of the present invention, there is provided a data transmission apparatus for converting 10-bit word string data representing signal information into 8-bit word string data. And a reference word data addition method for arranging an additional word data group including reference word data, each of which has a preset code, as 8-bit word string data, in accordance with a predetermined timing signal. Means,
The 8-bit word string data in which the additional word data group is arranged is converted into 10-bit word string data, and a composite based on the additional word data group including the 10-bit reference word data based on the reference word data is obtained. The system comprises 8 bit / 10 bit conversion means for obtaining 10 bit word string data, and data transmission means for changing the composite 10 bit word string data into serial data and transmitting the serial data for transmission.

Further, in the data transmission apparatus according to the tenth aspect of the present invention, each of a plurality of 10-bit word string data each representing signal information is converted into an 8-bit word. Convert to column data to obtain a plurality of 8-bit word column data 10 bits /
8-bit conversion means, data multiplexing means for performing multiplexing processing on a plurality of 8-bit word string data to form multiplexed 8-bit word string data, and multiplexed 8-bit word string data according to a predetermined timing signal. Reference word data adding means for arranging an additional word data group including reference word data each of which is 8-bit word data having a preset code, and multiplexed 8-bit word string data having the additional word data group arranged therein Is converted to 10-bit word string data, and a composite 1 having a portion based on an additional word data group including 10-bit reference word data based on the reference word data is obtained.
It is provided with an 8-bit / 10-bit conversion means for obtaining 0-bit word string data, and a data transmission means for changing the composite 10-bit word string data into serial data and transmitting the serial data for transmission.

[0017] As described above, the data transmission method according to any one of claims 1 to 4 in the claims of the present application, and claim 9 in the claims of the present application. In the data transmission device according to the invention, the 10-bit word string data representing the signal information is converted into the 8-bit word string data, and the 8-bit word string data is converted into the 8-bit word string data in accordance with a predetermined timing signal. Is added to the additional word data group including the reference word data which is the 8-bit word data having the code in which is set, and the subsequent conversion to the 10-bit word string data is performed. A composite 10-bit word string data having a portion based on the additional word data group including the bit reference word data is formed. , The complex 10-bit word sequence data are transmitted by being converted into serial data.

Thus, for example, conversion of 8-bit word data to which an additional word data group is added into 10-bit word string data, additional word data including 10-bit reference word data based on the reference word data obtained by the conversion. Composite 1 with group-based part
Conversion of 0-bit word string data into serial data and transmission of serial data obtained by converting composite 10-bit word string data can be relatively easily arranged without requiring development of new circuit elements and the like. Means, such as integrated circuits (I) provided for digital data transmission over Fiber Channel systems.
C) The element can be used effectively.

The data transmission method according to any one of claims 5 to 8 in the claims of the present application, and the data transmission method according to claim 10 in the claims of the present application In the data transmission apparatus according to the present invention, each of the plurality of 10-bit word string data, each of which represents signal information, is converted into 8-bit word string data, and the plurality of 8-bit word string data obtained thereby is converted into the 8-bit word string data. The multiplexing process is performed to form multiplexed 8-bit word string data, and the multiplexed 8-bit word string data is converted into 8-bit word data having a code set according to a predetermined timing signal. The addition of the additional word data group including the reference word data and the subsequent conversion to 10-bit word string data are performed, Composite 10-bit word sequence data having a portion based on the additional word data group including the 10-bit reference word data based on Dodeta is formed, the complex 10-bit word sequence data are transmitted by being converted into serial data.

Thus, for example, the conversion of the multiplexed 8-bit word data to which the additional word data group is added into the 10-bit word string data, the additional word including the 10-bit reference word data based on the obtained reference word data Conversion of composite 10-bit word string data having a portion based on a data group into serial data and transmission of serial data obtained by converting the composite 10-bit word string data require development of new circuit elements and the like. Rather, means that can be arranged relatively easily, for example, integrated circuit (IC) elements provided for digital data transmission over Fiber Channel systems, can be effectively utilized and implemented.

Further, according to the data transmission method according to the invention described in any one of claims 1 to 8 in the claims of the present application, or claim 9 or claim in the claims of the present application The composite 10-bit word string data to be transmitted from the data transmission apparatus according to the invention described in Item 10 is, on the receiving side, a 10-bit reference word data that is 8 bits from the 10-bit word string data. It is assumed that it is appropriately detected as reference word data required for conversion into word string data and the like. Therefore, on the receiving side, the data synchronization state required for the process for reproducing the signal information based on the received composite 10-bit word string data is reliably obtained based on the 10-bit reference word data. Is maintained.

[0022]

FIG. 1 shows a data transmission method according to an embodiment of the present invention described in the claims of the present application. 1 shows an example of a transmission device.

In the example shown in FIG. 1, four 10-bit word string data DV (10) A, DV (10) B, DV (10) each representing signal information different from each other.
C and DV (10) D are four 10-bit / 8 bits, respectively.
It is supplied to the bit conversion units 11A, 11B, 11C and 11D. 10-bit word string data DV (10) A to D
Each of V (10) D is, for example, “SMPTE 125
M "or" SMPTE 259M ", and the word transmission rate is 27 bits.
MBps.

10 bit / 8 bit converters 11A to 11
D respectively include a word clock signal CLA and a word clock signal C sent from the word clock generator 12.
LB is supplied, and the frequency of the word clock signal CLB is selected to be 1.25 times the frequency of the word clock signal CLA.

In the 10-bit / 8-bit converter 11A, according to the word clock signals CLA and CLB,
4 consecutive 10-bit word string data DV (10) A
Words (4 × 10 = 40 bits) are sequentially latched, and 8 bits are sequentially extracted from each of the latched 4 words as 1 word to obtain 8-bit word string data DV (8) A. Form. That is, 10 bits / 8 bits are added to the 10-bit word string data DV (10) A.
After conversion, 10-bit word string data DV (10)
This is to obtain 8-bit word string data DV (8) A based on A.

Similarly, in the 10-bit / 8-bit converter 11B, the word clock signals CLA and CL are output.
B, 10-bit word string data DV (10) B
Are successively latched, and 8 bits are sequentially extracted as one word from each of the latched four words, and the 8-bit word string data DV is read out.
(8) Form B, 10-bit / 8-bit conversion unit 11C
In the above, in accordance with the word clock signals CLA and CLB, successive four words of the 10-bit word string data DV (10) C are sequentially latched, and eight bits from each of the latched four words are assigned one bit. 8 bits word string data DV (8)
C, and a 10-bit / 8-bit conversion unit 11
In D, successive four words of the 10-bit word string data DV (10) D are sequentially latched according to the word clock signals CLA and CLB, and eight bits are respectively addressed from each of the latched four words. It is sequentially extracted as one word, and the 8-bit word string data DV
(8) Form D. That is, in the 10-bit / 8-bit conversion unit 11B, the 10-bit word string data DV (1
0) B is subjected to 10-bit / 8-bit conversion to obtain 8-bit word sequence data DV (8) B based on 10-bit word sequence data DV (10) B, and 10-bit / 8-bit conversion unit 11C performs 10-bit word sequence data DV
(10) Perform 10-bit / 8-bit conversion on C,
Obtain 8-bit word string data DV (8) C based on bit word string data DV (10) C, 10 bits / 8bi
In the t converter 11D, the 10-bit word string data D
V (10) D is subjected to 10-bit / 8-bit conversion to obtain 1
This is to obtain 8-bit word string data DV (8) D based on 0-bit word string data DV (10) D.

10 bit / 8 bit conversion units 11A to 11
8-bit word string data DV (8) respectively obtained from D
A to DV (8) D are supplied to the data multiplexing unit 13.
The data multiplexing unit 13 is also supplied with the word clock signal CLB and the word clock signal CLC sent from the word clock generation unit 12, and the frequency of the word clock signal CLC is selected to be four times the frequency of the word clock signal CLB.

The 8-bit word string data DV (8) A to DV (8) D supplied to the data multiplexing unit 13 are word-synchronized with each other, as shown in FIG. .. In which 8-bit words A0, A1, A2,... Are successively connected, as shown in FIG. 2B, 8-bit words B0, B1, B2,.
As shown in C of FIG.
Are successively connected, and as shown in FIG. 2D, 8-bit words D0, D1, D2,... Are successively connected. Then, in the data multiplexing section 13, the word clock signal is generated within a period in which each one word of the 8-bit word string data DV (8) A to DV (8) D is simultaneously obtained in accordance with the word clock signal CLB. 8-bit word string data DV according to signal CLC
(8) A to DV (8) A data multiplexing process is performed by sequentially taking out addresses of 1/4 words of D, whereby multiplexed 8-bit word string data DV (D) as shown in FIG. 8) Form M.

The multiplexed 8-bit word string data DV (8) M obtained from the data multiplexing unit 13 is supplied to a reference word data adding unit 14. The additional word data group DWS sent from the word data sending unit 15 is also supplied to the reference word data adding unit 14, and the word clock signal CL sent from the word clock generating unit 12 is further supplied.
C and a timing signal STR transmitted at a predetermined timing set in advance from the timing signal forming unit 16.

The additional word data group DWS sent from the word data sending unit 15 is composed of, for example, four 8-bit word data W0, W1, W each set in advance.
2 and W3, and these 8-bit word data W
0, any of W1, W2 and W3, for example, 8
The bit word data W1 is used as reference word data having a preset code. When the 8-bit word data W1, which is the reference word data, is converted into 10 bits, a code "0011" called K28.5 that makes RD positive or negative as shown in FIG.
Word data DS (10) having a 10-bit configuration, which takes 11 1010 "or" 110000 0101 ", forms 10-bit reference word data.

Then, in the reference word data adding unit 14, the multiplexed 8-bit word string data DV from the data multiplexing unit 13 is stored while appropriately holding the additional word data group DWS supplied from the word data transmitting unit 15.
(8) M words are sequentially taken in according to the word clock signal CLC. Then, under such a state, the multiplex 8 which is sequentially captured according to the timing signal STR.
Four consecutive words of each word of the bit word string data DV (8) M are converted into four 8-bit word data W0, W4, which form the additional word data group DWS held in the word data transmitting unit 15. W1, W2 and W3
8 bit word string data DV
(8) Four 8-bit word data W0, W1,
Additional word data group DWS composed of W2 and W3
Distribute.

That is, at each timing set by the timing signal STR, four consecutive words in the multiplexed 8-bit word string data DV (8) M supplied from the data multiplexing unit 13 are formed into an additional word data group DWS. Four 8-bit word data W0, W1, W2
And W3 to form multiplexed 8-bit word string data DV (8) Z in which an additional word data group DWS including four 8-bit word data W0, W1, W2, and W3 is arranged. is there. Since the 8-bit word data W1 in the additional word data group DWS is the reference word data having a preset code, the 8-bit word data W1 is preset between words in the multiplexed 8-bit word string data DV (8) M. Word data group D including 8-bit word data W1 having reference codes
By allocating WS, multiplexed 8-bit word string data DV (8) Z in which additional word data groups are arranged is obtained.

Thus, the multiplexed 8-bit word string data DV (8) Z in which the additional word data groups formed in the reference word data adding section 14 are arranged is, for example, as shown in FIG. 2F. And F in FIG.
, The multiplexed 8-bit word string data DV transmitted from the data multiplexing unit 13 as shown in FIG.
(8) Four consecutive words A0, B0, C0 in M
And D0 are four 8-bit word data W0, W1,
Additional word data group DWS composed of W2 and W3
Has been replaced by

The multiplexed 8-bit word string data DV (8) Z in which the additional word data groups obtained from the reference word data adding section 14 are arranged is supplied to the 8B / 10B conversion section 17. The 8B / 10B converter 17 has a word clock signal CL sent from the word clock generator 12.
C is also supplied.

In the 8B / 10B conversion unit 17, the multiplexed 8-bit word string data DV (8) Z in which the additional word data group from the reference word data adding unit 14 is arranged according to the word clock signal CLC. , And performs 8B / 10B conversion for converting each of the 8 bits into 10 bits, thereby obtaining composite 10-bit word string data DV (1
0) Form Z. The composite 10-bit word string data DV (10) Z is obtained based on 8-bit word data W1, which is reference word data having a preset code in the additional word data group DWS.
The code “001111 1010” or “110000 0” called K28.5 that makes RD positive or negative.
101 "word data DS (1
0), and has a portion based on the additional word data group DWS including the 10-bit reference word data.

R obtained from the 8B / 10B conversion unit 17
A code “0” called K28.5 that makes D positive or negative
01111 1010 "or" 110000 010
Composite 1 including 10-bit reference word data taking 1 "
The 0-bit word string data DV (10) Z is supplied to a P / S conversion unit 18 forming a data transmission unit. In the P / S converter 18, the composite 10-bit word string data D
V (10) Z is converted to serial data DZS. Then, the serial data DZ obtained from the P / S converter 18
S is supplied to an optical signal forming unit 19 that forms a data transmission unit together with the P / S conversion unit 18.

The optical signal forming unit 19 converts the serial data DZS from the P / S converter 18 into an optical signal OZS, and converts the optical signal OZS through the optical connector 20.
To a data transmission line formed by using optical fiber, and thereby the serial data DZS
Is transmitted for transmission.

In the example of the data transmission apparatus shown in FIG. 1 as described above, for example, the 8B / 10B conversion unit 17,
The P / S conversion section 18 and the optical signal formation section 19 can be configured by effectively utilizing an integrated circuit (IC) element provided for digital data transmission by a fiber channel system. Also, the data transmission line formed by using the optical fiber 20 and the optical fiber can be an optical connector and a data transmission line provided for digital data transmission by the fiber channel system.
Therefore, for example, four 10-bit word string data DV (10) A to DV (10) D, each of which is assumed to represent digital video signal information according to “SMPTE 125M” or “SMPTE 259M”, It is possible to perform multiplex transmission using means that can be prepared relatively easily without the need to develop new circuit elements and the like.

Each of the 10-bit / 8-bit conversion units 11A to 11D in the example of the data transmission device shown in FIG. 1 has the same configuration and performs the same operation.
Such 10-bit / 8-bit conversion units 11A to 11D
Are represented by the 10-bit / 8-bit converter 11A, and a specific configuration example will be described below.

FIG. 3 shows a 10-bit / 8-bit conversion unit 11
A specific configuration example of A is shown. In the specific configuration example shown in FIG. 3, 10-bit word string data DV (10) A
Is supplied to the shift register 21. The 10-bit word string data DV (10) A is composed of, for example, 10-bit words A'0, A'1, A 'as shown in FIG.
, A′3,... Are sequentially connected.

The shift register 21 has four flip-flops.
The flops 22, 23, 24 and 25 are connected in cascade, and the clock terminals of the flip-flops 22 to 25 are supplied with a word clock signal CLA as shown in FIG. 4B. Then, the 10-bit word string data DV (1
0) A is input to the flip-flop 22. Thereby, in the shift register 21, the 10-bit word A 'of the 10-bit word string data DV (10) A
0, A'1, A'2, A'3,... Are sequentially transferred by flip-flops 22 to 25 in accordance with the word clock signal CLA.

Then, the 10-bit words A'0, A'1, A 'in the 10-bit word string data DV (10) A sequentially obtained at the respective output terminals of the flip-flops 22 to 25 constituting the shift register 21. 2, A'3,
.. Are input to the 40-bit flip-flop 26. The clock terminal of the 40-bit flip-flop 26 has a pulse generator 30 to which the word clock signal CLA and the word clock signal CLB (K in FIG. 4) are supplied.
, A latch pulse PL as shown in FIG. 4C, which is formed based on the word clock signal CLA, is supplied.

Thus, in the 40-bit flip-flop 26, 10 bits in the 10-bit word string data DV (10) A input from the shift register 21
Bit words A'0, A'1, A'2, A'3, ...
Is, for example, a 10-bit word A'0, A'1, A ', as shown in FIG.
2 and A'3, four consecutive words (4 × 10
= 40 bits). That is, in the 40-bit flip-flop 26, the 10-bit word string data DV (10) A is sequentially latched every time the latch pulse PL arrives, in units of data of four consecutive words. become.

As described above, four consecutive words of data in the 10-bit word string data DV (10) A latched in the 40-bit flip-flop 26 are supplied to the data selector 31. Data selector 3
1, E, F, G, and H of FIG. 4 formed based on the word clock signal CLB in the pulse generator 30.
And I, five data selection pulses PSA, PSB, PSC, PSD and PSE are provided. Each of these data selection pulses PSA to PSE has a pulse width equal to four times the word clock signal CLA.
It is assumed that the phase is sequentially shifted by 1/5 cycle under the assumption that the cycle is 1/5 and the cycle is 4 times the cycle of the word clock signal CLA.

In the data selection unit 31, five data selection pulses PSA for each of four consecutive words of the 10-bit word string data DV (10) A latched in the 40-bit flip-flop 26 , PSB, PSC, PSD, and PSE are selectively extracted according to the respective pulse periods, and data (40 bits) of four consecutive words in the 10-bit word string data DV (10) A is extracted to 8 bits. It is. For example, as shown in FIG. 4D, 10-bit words A'0, A'1 which are four consecutive words in the 10-bit word string data DV (10) A latched in the 40-bit flip-flop 26. , A′2 and A′3, the data selection unit 31 outputs a data selection pulse 31 as shown by E to I in FIG. 4 according to the data selection pulses PSA to PSE, respectively. The 8-bit address is 8-bit data A0, A
1, A2, A3 and A4. The 8-bit data A0 is 8 bits in the 10-bit word A'0, and the 8-bit data A1 is the remaining 2 bits in the 10-bit word A'0 and 6 bits in the 10-bit word A'1, Data A2 is the remaining 4 bits in 10-bit word A′1 and the 4 bits in 10-bit word A′2,
The 8-bit data A3 is the remaining 6 bits in the 10-bit word A'2 and the 2 bits in the 10-bit word A'3, and the 8-bit data A4 is the remaining 8 bits in the 10-bit word A'3.

As described above, in the data selection unit 31,
Five data selection pulses PSA, PSB, PSC, PSD, and P for each of four consecutive words of data in 10-bit word string data DV (10) A latched in 40-bit flip-flop 26
By performing selective extraction according to each pulse period of SE, the data selection unit 31 outputs 8-bit data A0, A1, A2, A3, and J3 as shown in FIG.
.. Are obtained as 8-bit words, and 8-bit word string data DVL (8) is obtained.

The 8-bit word string data DVL (8) obtained from the data selector 31 is supplied to the flip-flop 32
To be latched thereby. Flip
The flop 32 has four flip-flops 33, 3
4, 35 and 36 are connected in cascade. The clock terminals in each of the five flip-flops 32 to 36 are connected to the clock terminals as shown in FIG.
A word clock signal CLB is supplied.

Thus, each of the 8-bit words A0, A1, A2, A3,... Of the 8-bit word string data DVL (8) obtained from the data selecting section 31 has the flip-flop 32 as the first stage. Five flip-flops 32 to flip-flop 36 at the last stage
At 36, the data is latched by the flip-flop 32 according to the word clock signal CLB, and is sequentially transferred from the flip-flop 32 to the flip-flop 36. As a result, as shown in L of FIG.
8-bit word string data DV (8) A consisting of a series of 8-bit words A0, A1, A2, A3,... Is obtained. That is, 8-bit word string data DV (8) A based on 10-bit word string data DV (10) A is obtained.

10 bit / 8 bit conversion units 11B to 11
A specific configuration example for each of D is also shown in FIG.
The configuration is the same as the specific configuration example of the bit / 8-bit conversion unit 11A, and the 10-bit / 8-bit conversion unit 11A
8 bit word string data DV based on 10 bit word string data DV (10) A
(8) In the same manner as when A is obtained, 10 bits / 8 b
According to a specific configuration example of the it conversion unit 11B, based on the 10-bit word string data DV (10) B, the 8-bit word string data DV (8) in which 8-bit words B0, B1, B2, B3,. ) B is obtained and 10b
According to an example of the specific configuration of the it / 8-bit conversion unit 11C, 8-bit word string data DV composed of a series of 8-bit words C0, C1, C2, C3,... based on 10-bit word string data DV (10) C (8) C is obtained, and 10-bit word string data D is obtained by a specific configuration example of the 10-bit / 8-bit conversion unit 11D.
8-bit words D0, D1, D based on V (10) D
., 8-D word string data DV (8) D consisting of a series of 2, D3,...

FIG. 5 shows an example of a data transmission method according to the invention described in the claims of the present application.
7 shows another example of the data transmission device according to the invention described in the claims of the present application.

The example shown in FIG. 5 has many parts which are configured similarly to the example shown in FIG.
In FIG. 1, parts corresponding to the respective parts shown in FIG.
Are denoted by the same reference numerals as in the first embodiment, and redundant description thereof will be omitted.

In the example shown in FIG. 5, five 10-bit word string data DV (10) A, DV (10) B, DV (10) each representing different signal information.
C, DV (10) D and DV (10) E are five 10B / 8B converters 11A, 11B, 11C, 11D, respectively.
And 11E. Each of these 10-bit word string data DV (10) A to DV (10) E is also, for example, “SMPTE 125M” or “SMPTE
259M ", and the word transmission rate is 27 MBps.

10-bit / 8-bit conversion units 11A to 11
E respectively include a word clock signal CLA and a word clock signal C sent from the word clock generator 12.
LB is supplied, and the frequency of the word clock signal CLB is selected to be 1.25 times the frequency of the word clock signal CLA.

10 bit / 8 bit converters 11A to 11
D, 8-bit word string data DV (8) A, DV in the same manner as in the example shown in FIG.
(8) Form B, DV (8) C or DV (8) D. Further, in the 10-bit / 8-bit conversion unit 11E, one-bit conversion is performed according to the word clock signals CLA and CLB.
Four consecutive words (4 × 10 = 40 bits) of the 0-bit word string data DV (10) E are sequentially latched, and eight bits from each latched four words are regarded as one word. The 8-bit word string data DV (8) E is formed by sequentially taking out the data. That is, 10-bit / 8-bit conversion is performed on the 10-bit word string data DV (10) E to obtain 8-bit word string data DV (8) E based on the 10-bit word string data DV (10) E.

10-bit / 8-bit conversion units 11A to 11
8-bit word string data DV (8) respectively obtained from E
A to DV (8) E are supplied to the data multiplexing unit 13.
The word clock signal CLB and the word clock signal CLC sent from the word clock generation unit 12 are also supplied to the data multiplexing unit 13, and the frequency of the word clock signal CLC is selected to be five times the frequency of the word clock signal CLB.

The 8-bit word string data DV (8) A to DV (8) E supplied to the data multiplexing unit 13 are synchronized with each other under word synchronization, as shown in FIG. ., The 8-bit words A0, A1, A2,... Are successively connected, and the 8-bit words B0, B1, B2,.
As shown in C of FIG.
Are successively connected, as shown in FIG. 6D, those in which 8-bit words D0, D1, D2,... Are successively connected, and as shown in FIG. The bit words E0, E1, E2,... Then, in the data multiplexing unit 13, the 8-bit word string data D is output in accordance with the word clock signal CLB.
In a period in which one word of each of V (8) A to DV (8) E is simultaneously obtained, 8-bit word string data DV (8) A to DV (8) according to word clock signal CLC.
A data multiplexing process is performed by sequentially taking out each 1/5 word address of E, thereby forming multiplexed 8-bit word string data DV (8) M as shown in F of FIG.

The multiplexed 8-bit word string data DV (8) M obtained from the data multiplexing unit 13 is supplied to a reference word data adding unit 14. The additional word data group DWS sent from the word data sending unit 15 is also supplied to the reference word data adding unit 14, and the word clock signal CL sent from the word clock generating unit 12 is further supplied.
C and a timing signal STR transmitted at a predetermined timing set in advance from the timing signal forming unit 16.

The additional word data group DWS sent from the word data sending unit 15 is composed of, for example, five 8-bit word data W0, W1, and W each set in advance.
2, W3 and W4, for example, 8 of these
Bit word data W1 is used as reference word data having a preset code, as in the case of the example shown in FIG.

In the reference word data adding section 14, the multiplexed 8-bit word string data DV from the data multiplexing section 13 is stored while appropriately holding the additional word data group DWS supplied from the word data transmitting section 15.
(8) M words are sequentially taken in according to the word clock signal CLC. Then, under such a state, the multiplex 8 which is sequentially captured according to the timing signal STR.
Five consecutive words of each word of the bit word string data DV (8) M are converted into five 8-bit word data W0, W5, which form the additional word data group DWS held in the word data transmitting unit 15. W1, W2, W3 and W4 are replaced with five 8-bit word data W0,
An additional word data group DWS composed of W1, W2, W3 and W4 is arranged.

That is, at each timing set by the timing signal STR, five consecutive words in the multiplexed 8-bit word string data DV (8) M supplied from the data multiplexing unit 13 are formed into an additional word data group DWS. 8-bit word data W0, W1, W
Multiplexed 8-bit word string data DV (8) in which an additional word data group DWS composed of five 8-bit word data W0, W1, W2, W3 and W4 is replaced by W8 and W3 and W4. Z is formed. Since the 8-bit word data W1 in the additional word data group DWS is the reference word data having a preset code, the 8-bit word data W1 is preset between words in the multiplexed 8-bit word string data DV (8) M. And a multiplexed 8-bit word string data DV (8) Z in which the additional word data group is arranged, including the additional word data group DWS including the reference word data as the 8-bit word data W1 having the set code.
You will get

The multiplexed 8-bit word string data DV (8) Z in which the additional word data groups formed in the reference word data adding section 14 are arranged as described above is, for example, as shown in FIG. It is assumed. In the case of G in FIG.
Of the multiplexed 8-bit word string data DV as shown in FIG.
(8) Five consecutive words A0, B0, C in M
0, D0 and E0 are five 8-bit word data W
0, W1, W2, W3, and W4.

The multiplexed 8-bit word string data DV (8) Z in which the additional word data groups obtained from the reference word data adding section 14 are arranged is supplied to the 8B / 10B conversion section 17. The 8B / 10B converter 17 has a word clock signal CL sent from the word clock generator 12.
C is also supplied.

The operation of the 8B / 10B conversion unit 17 and the subsequent P / S conversion unit 18 and optical signal forming unit 19, and the data transmission path formed by using the optical connector 20 and the optical fiber Is
Since it is the same as the case of the example shown in FIG. 1, duplicate description will be omitted.

As described above, in the example shown in FIG. 5, each represents digital video signal information according to, for example, "SMPTE 125M" or "SMPTE 259M", and each represents different signal information. Five 10-bit word string data DV (10) A
To DV (10) E are multiplexed into serial data DZ.
It is converted to S and transmitted.

In the data transmission apparatus shown in FIG. 5 as described above, for example, the 8B / 10B conversion unit 17, the P / S conversion unit 18, and the optical signal forming unit 19 are connected to a fiber channel An integrated circuit (IC) element provided for digital data transmission by the system can be effectively used and configured.
Also, a data transmission path formed by using an optical fiber can be an optical connector and a data transmission path provided for digital data transmission by a fiber channel system. Therefore, each is, for example, “SMPTE 12
5M ”or“ SMPTE 259M ”.
0-bit word string data DV (10) A to DV (10)
E can be multiplex-transmitted using means that can be prepared relatively easily without the need to develop new circuit elements and the like.

In each of the example shown in FIG. 1 and the example shown in FIG. 5, four 10-bit word string data DV (10) A to DV (10) D or five 10-bit word string data DV (10) A to DV (1
0) E is multiplexed and provided for transmission, and the 10-bit word string data provided for transmission is:
The number need not be limited to four or five, but may be any number. Further, the 10-bit word string data provided for transmission need not necessarily be plural, but may be singular, for example, 10-bit word string data DV (10) A to DV.
(10) Any one of E may be used, and in that case, means corresponding to the data multiplexing unit 13 in the example shown in FIG. 1 or 5 is not required.

FIG. 7 shows the P / S converter 18 and the optical signal forming unit 1 forming the data transmitting unit in the example shown in FIG.
9 shows an example of a data receiving apparatus that receives an optical signal OZS based on serial data DZS, which is transmitted from the data signal DZS.

In the example of the data receiving apparatus shown in FIG. 7, for example, an optical signal OZS based on the serial data DZS transmitted through a data transmission path formed using an optical fiber is converted into an optical signal. A photoelectric conversion unit 42 supplied through a connector 41 is provided. In the photoelectric conversion unit 42, the optical signal OZS is received, and the serial data DZS is reproduced in the form of an electric signal corresponding to the received optical signal OZS.

The serial data DZS obtained from the photoelectric conversion unit 42 is supplied to an S / P conversion / clock recovery unit 43. Then, in the S / P conversion / clock recovery unit 43, the serial data DZS is subjected to S / P conversion,
Composite 10-bit word string data DV (10) Z, which is parallel data based on the serial data DZS, is formed.

In the S / P conversion / clock recovery section 43, a clock is detected for the serial data DZS, and the clock signal CK is reproduced. S / P
The clock signal CK reproduced by the conversion / clock reproduction unit 43 is supplied to a word clock generation unit 44, and the word clock generation unit 44 outputs three types of word clock signals CLA, CLB, and CL based on the clock signal CK.
C is sent.

Composite 10-bit word string data DV (10) Z obtained in S / P conversion / clock recovery section 43
Is supplied to the 10B / 8B converter 45 and the reference word data detector 46. The reference word data detection unit 46
R included in a portion based on the additional word data group in the composite 10-bit word string data DV (10) Z
It detects 10-bit reference word data having a code called K28.5 in which D is positive or negative and sends out a reference word data detection signal SDR.

The reference word data detection signal SDR obtained from the reference word data detector 46 is supplied to a word clock generator 44 and a control signal generator 47. In the word clock generator 44, the word clock signals CLA and CLB are generated by the reference word data detection signal SDR.
And the respective phases of the CLC are set. In the control signal forming section 47, the reference word data detection signal SD
A control signal SS based on R is formed.

The 10B / 8B conversion unit 45 to which the composite 10-bit word string data DV (10) Z is supplied from the S / P conversion / clock recovery unit 43 supplies a word clock signal transmitted from the word clock generation unit 44. A CLC is also provided. In the 10B / 8B converter 45, the composite 10-bit word string data DV (10) Z undergoes 10B / 8B conversion under the word clock signal CLC, and the composite 10-bit word string data DV (10) Based on Z, multiplexed 8-bit word string data DV (8) Z in which an additional word data group DWS is arranged is formed.

At this time, additional word data group DW in composite 10-bit word string data DV (10) Z
The 10-bit word data and the 10-bit reference word data included in the portion based on S are converted into 8-bit word data W0, W1, W2, and W3, respectively. Then, these converted 8-bit word data W0, W
1, W2 and W3 are the additional word data groups DWS
Are included in the multiplexed 8-bit word string data DV (8) Z in which

The multiplexed 8-bit word string data DV (8) Z provided with the additional word data group DWS obtained from the 10B / 8B converter 45 is supplied to the reference word data separator 48. The reference word data separation unit 48 includes:
Word clock signal C from word clock generator 44
The control signal SS based on the LC and the reference word data detection signal SDR formed in the control signal forming section 47 is also supplied. Then, the reference word data separating section 48 corresponds to the 10-bit reference word data included in the portion based on the additional word data group DWS in the composite 10-bit word string data DV (10) Z from the control signal forming section 47. Based on the control signal SS, the multiplexed 8-bit word string data DV (8) M and the 8-bit word data W0, W are converted from the multiplexed 8-bit word string data DV (8) Z in which the additional word data group DWS is arranged.
1, and an additional word data group DWS including W2 and W3 are separated and taken out.

The multiplexed 8-bit word string data DV (8) M extracted by the reference word data separating section 48 is
The data is supplied to the data separation unit 49. The data separation unit 49 is also supplied with the word clock signal CLB and the word clock signal CLC from the word clock generation unit 44.
Then, in the data separation unit 49, the multiplexed 8-bit word string data DV (8) M is converted to 8 by the word clock signal CLC and the word clock signal CLB.
Bit word string data DV (8) A, DV (8) B, D
V (8) C and DV (8) D are extracted separately from each other.

Then, 8 obtained from the data separation unit 49
Bit word string data DV (8) A to DV (8) D
8 bit / 10 bit conversion units 50A, 50B, 5 respectively
0C and 50D. The word clock signals CLA and CL transmitted from the word clock generation unit 44 are respectively provided to the 8-bit / 10-bit conversion units 50A to 50D.
B is also supplied.

In the 8-bit / 10-bit conversion section 50A, according to the word clock signals CLA and CLB,
Five consecutive words (5 × 8 = 40 bits) of the 8-bit word string data DV (8) A are sequentially latched, and 10 bits from each latched five words are regarded as one word. The 10-bit word string data DV (10) A is formed sequentially. That is, the 8-bit word string data DV (8) A has 8 bits / 10 bi
t conversion is performed, and the 8-bit word string data DV (8)
Thus, 10-bit word string data DV (10) A based on A is obtained.

Similarly, in the 8-bit / 10-bit conversion section 50B, the word clock signals CLA and CL are output.
In accordance with B, successive 5-word addresses of the 8-bit word string data DV (8) B are sequentially latched, and 10-bit addresses are sequentially extracted from each of the latched 5 words as 1 word. , 10-bit word string data DV (10) B is formed, and the word clock signals CLA and C
In accordance with LB, successive 5-word addresses of 8-bit word string data DV (8) C are sequentially latched, and 10-bit addresses are sequentially extracted from each latched 5-word data as 1-word data. , 10-bit word string data DV (10) C is formed.
In the bit conversion unit 50D, the word clock signal C
8-bit word string data DV according to LA and CLB
(8) Five consecutive words of D are sequentially latched, and ten bits are sequentially extracted from each latched five words as one word, and 10-bit word string data DV (10) D Is formed. That is, 8b
In the it / 10-bit conversion unit 50B, the 8-bit word string data DV (8) B is subjected to 8-bit / 10-bit conversion, and the 10-bit word string data DV (10) B based on the 8-bit word string data DV (10) B. Is obtained, and the 8-bit / 10-bit conversion unit 50C converts the 8-bit word string data DV (8) C to 8 bit / 10bi.
t conversion is performed, and the 8-bit word string data DV (8)
The 10-bit word string data DV (10) C based on C is obtained, and the 8-bit / 10-bit conversion unit 50D
8 bits / 10 bits for the 8-bit word string data DV (8) D
Bit conversion is performed, and the 8-bit word string data DV is converted.
(8) 10-bit word string data DV based on D (8)
D is obtained.

The 8-bit / 10-bit conversion unit 50
A to 50D to 10-bit word string data DV (10)
A to DV (10) D are derived separately, so that 1
0-bit word string data DV (10) A to DV (10)
Each of D will be reproduced.

The P / S converter 18 and the optical signal forming unit 19 forming the data transmitting unit in the example shown in FIG.
An example of the data receiving apparatus which receives the optical signal OZS based on the serial data DZS transmitted from the above is also configured as in the example shown in FIG. However, five 8-bit word string data are individually obtained from a data separation unit corresponding to the data separation unit 49, and five 8-bit / 10-bit conversion units to which the data are respectively supplied are provided. The frequency of the CLC is changed.

[0082]

As is apparent from the above description, the data transmission method according to the invention described in any one of claims 1 to 4 in the claims of the present application, and the claims of the present application In the data transmission apparatus according to the ninth aspect of the present invention, the 10-bit word string data representing the signal information is converted into the 8-bit word string data, and a predetermined The addition of the additional word data group including the reference word data which is the 8-bit word data each having the code set according to the timing signal, and the subsequent conversion to the 10-bit word string data are performed. Composite 10-bit word having a portion based on an additional word data group including 10-bit reference word data based on the reference word data Column data is formed, the complex 10
Bit word string data is converted into serial data and transmitted.

Therefore, the data transmission method according to the invention described in any one of claims 1 to 4 in the claims of the present application, and the data transmission method according to claim 9 in the claims of the present application According to the data transmission apparatus of the present invention, for example, conversion of 8-bit word data to which an additional word data group is added into 10-bit word string data, including 10-bit reference word data based on reference word data obtained by the conversion. Development of new circuit elements, etc., for converting composite 10-bit word string data having a portion based on an additional word data group into serial data and transmitting serial data obtained by converting the composite 10-bit word string data Without needing
Means that can be relatively easily arranged, for example, an integrated circuit (IC) element provided for digital data transmission by a fiber channel system can be effectively used.

Also, a data transmission method according to any one of claims 5 to 8 in the claims of the present application, and a data transmission method according to claim 10 in the claims of the present application In the data transmission apparatus according to the present invention, each of the plurality of 10-bit word string data, each of which represents signal information, is converted into 8-bit word string data, and the plurality of 8-bit word string data obtained thereby is converted into the 8-bit word string data. The multiplexing process is performed to form multiplexed 8-bit word string data, and the multiplexed 8-bit word string data is converted into 8-bit word data having a code set according to a predetermined timing signal. The addition of the additional word data group including the reference word data and the subsequent conversion to 10-bit word string data are performed, Composite 10-bit word sequence data having a portion based on the additional word data group including the 10-bit reference word data based on Dodeta is formed, the complex 10-bit word sequence data are transmitted by being converted into serial data.

Therefore, the data transmission method according to any one of claims 5 to 8 in the claims of the present application, and the data transmission method according to claim 10 in the claims of the present application According to the data transmission apparatus of the present invention, for example, conversion of multiplexed 8-bit word data to which an additional word data group has been added into 10-bit word string data, and conversion of 10-bit reference word data based on the reference word data obtained thereby. Conversion of composite 10-bit word string data having a portion based on the included additional word data group into serial data, and composite 1
Means that can arrange transmission of serial data obtained by converting 0-bit word string data relatively easily without the need to develop new circuit elements, for example,
An integrated circuit (IC) element provided for digital data transmission by a fiber channel system can be effectively used.

Further, the data transmission method according to any one of claims 1 to 8 in the claims of the present application, or claim 9 or claim in the claims of the present application The composite 10-bit word string data to be transmitted from the data transmission apparatus according to the invention described in Item 10 is, on the receiving side, a 10-bit reference word data that is 8 bits from the 10-bit word string data. Since it is to be properly detected as reference word data required for conversion to word string data and the like, the signal information based on the received composite 10-bit word string data is received on the receiving side. A state in which the data synchronization state required for the processing for reproducing the data can be reliably obtained based on the 10-bit reference word data. , So that can be secured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a data transmission apparatus according to the invention described in the claims of the present application, which is provided for implementing an example of the data transmission method according to the invention described in the claims of the present application. It is a block diagram.

FIG. 2 is a time chart for explaining the operation of the example shown in FIG. 1;

FIG. 3 shows 10b used in the example shown in FIG.
FIG. 4 is a block diagram illustrating a specific configuration example of an it / 8-bit conversion unit.

FIG. 4 is a time chart for explaining the operation of a specific configuration example of the 10-bit / 8-bit converter shown in FIG. 3;

FIG. 5 is a diagram illustrating another example of the data transmission device according to the invention described in the claims of the present application, which is provided for implementing an example of the data transmission method according to the invention described in the claims of the present application. FIG. 2 is a block diagram showing the configuration.

FIG. 6 is a time chart for explaining the operation of the example shown in FIG. 5;

FIG. 7 is a block diagram illustrating an example of a data receiving device that receives an optical signal transmitted according to the example illustrated in FIG. 1 and performs data reproduction.

FIG. 8 is a conceptual diagram for explaining reference word data used in transmitting digital data.

[Explanation of symbols]

11A to 11E: 10-bit / 8-bit conversion unit,
12: Word clock generator, 13: Data multiplexing unit, 14: Reference word data adding unit, 15
··· Word data sending section · · · · · · Timing signal forming section · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
..P / S converter, 19 ... optical signal generator, 20
... optical connector, 21 ... shift register, 2
2 to 25, 32 to 36: flip flop, 2
6 ... 40 bit flip flop, 30 ...
Pulse generator, 31 ... Data selector

Claims (10)

[Claims] 1. A 10-bit word string data representing signal information is converted into an 8-bit word string data, and each of the 8-bit word string data has a preset code in response to a predetermined timing signal. An additional word data group including the reference word data as bit word data is arranged, and the 8-bit word string data in which the additional word data group is arranged is converted into 10-bit word string data, and Obtaining composite 10-bit word string data having a portion based on the additional word data group including 10-bit reference word data based on word data, changing the composite 10-bit word string data into serial data, and transmitting the serial data The data transmission method to send. 2. When arranging an additional word data group in 8-bit word string data, the additional word data group is divided into 10-bit reference word data in a portion based on the additional word data group in the composite 10-bit word string data. 2. The data transmission method according to claim 1, wherein the running disparity is always selected to be positive or negative at least once. 3. The transmission of serial data obtained by changing the composite 10-bit word string data is performed so as to be transmitted through a data transmission line configured using an optical fiber. 3. The data transmission method according to 1 or 2. 4. The system according to claim 1, wherein the 10-bit word string data represents video signal information.
4. The data transmission method according to 2 or 3. 5. A plurality of 10-bit word string data, each of which represents signal information, is converted into an 8-bit word string data to obtain a plurality of 8-bit word string data. A multiplexing process is performed on the column data to form multiplexed 8-bit word sequence data, and the multiplexed 8-bit word sequence data is combined with 8-bit word data each having a preset code according to a predetermined timing signal. An additional word data group including the reference word data is arranged, and the multiplexed 8-bit word string data in which the additional word data group is arranged is converted into 10-bit word string data, and the reference word data is converted to the 10-bit word string data. A composite 10-bit word sequence having a portion based on the additional word data group including 10-bit reference word data based on Give chromatography data, and change the composite 10-bit word sequence data to serial data, the data transmission method of transmitting in order to transmit the serial data. 6. When arranging an additional word data group in multiplexed 8-bit word string data, the additional word data group is divided into 10 bits in a portion based on the additional word data group in the composite 10-bit word string data.
6. The data transmission method according to claim 5, wherein the bit reference word data is set such that the running disparity always becomes positive or negative at least once. 7. The transmission of serial data obtained by changing the composite 10-bit word string data is performed so as to be transmitted through a data transmission line constituted by using an optical fiber. 7. The data transmission method according to 5 or 6. 8. The data transmission method according to claim 5, wherein each of the plurality of 10-bit word string data represents video signal information. 9. A 10-bit / word string for converting 10-bit word string data representing signal information into 8-bit word string data.
8-bit conversion means, and an additional word data group including reference word data, each of which is a 8-bit word data having a preset code, is arranged in the 8-bit word string data in accordance with a predetermined timing signal. Means for converting the 8-bit word string data in which the additional word data group is arranged into 10-bit word string data, and includes 10-bit reference word data based on the reference word data. 8-bit / 10-bit conversion means for obtaining composite 10-bit word string data having a part based on the additional word data group; changing the composite 10-bit word string data into serial data; and transmitting the serial data for transmission A data transmission device comprising: data transmission means. 10. A 10-bit / 8-bit conversion means for converting a plurality of 10-bit word string data each representing signal information into 8-bit word string data to obtain a plurality of 8-bit word string data. Data multiplexing means for multiplexing the plurality of 8-bit word string data to form multiplexed 8-bit word string data; and multiplexing 8-bit word string data in accordance with a predetermined timing signal. 8 with preset code
A reference word data adding means for arranging an additional word data group including the reference word data as bit word data; and a 10-bit word string data for the multiplexed 8-bit word string data in which the additional word data group is arranged. 8-bit / 10-bit conversion means for performing conversion to obtain composite 10-bit word string data having a portion based on the additional word data group including 10-bit reference word data based on the reference word data; A data transmission unit configured to convert word string data into serial data and transmit the serial data for transmission.