JP2001136212A - Method and device for data transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit complex 10-bit word string data obtained by performing 8B/10B conversion so that a receiving side can reliably obtain a necessary data synchronous state by attaching word synchronous data to 8-bit word stream data on the basis of a digital video signal. SOLUTION: This device obtains the 8-bit word string data based on a 480P signal, inserts an additional word data group including specified work synchronous data made 8-bit word data having a preliminarily set code into it with a prescribed word interval provided, converts the 8-bit word string data accompanying the additional word data group into 10-bit word string data, forms the complex 10-bit word string data which are obtained on the basis of the specified work synchronous data, include positive or negative 10-bit word synchronous data of which running disparity is preliminarily defined and have a part on the basis of the additional word data group, converts them into serial data and transmits the serial data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention described in the claims of the present application obtains 8-bit word string data based on a digital video signal, and converts the 8-bit word string data into a 10-bit word string including word synchronization data. The present invention relates to a data transmission method for converting the 10-bit word string data into serial data and transmitting the converted data for transmission, and a data transmission apparatus provided for implementing the method.

[0002]

2. Description of the Related Art As one mode of transmission of digital data representing various kinds of signal information such as image information, optical transmission in which digital data is converted into an optical signal and transmitted through a transmission line formed using an optical fiber. A system has been proposed. Digital data handled under such an optical transmission system is, for example, several hundred Mbps.
Is serial data having a bit transmission rate exceeding 1 Gbps.

As one of such digital data transmission systems, a fiber channel system (Fibr
e Channel System) is known. Digital data handled under a digital data transmission system such as this fiber channel system is converted on the transmission side into, for example, 8 bits / 10 bits (8B / 8 bits) where every 8 bits is converted to 10 bits.
10B conversion) processing is performed to obtain 10-bit word string data. And what is actually transmitted is 8B / 1
Serial data obtained by subjecting the 10-bit word string data formed by performing the 0B conversion to a parallel / serial conversion (P / S conversion) process for further converting parallel data into serial data is obtained.

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 to form 10-bit word string data. Part 1
10-bit / 8-bit conversion (10B / 10-bit conversion) in which 0-bit word string data is converted into 8-bit data every 10 bits
8B conversion) processing. Then, the original digital video signal is reproduced from the word string data formed by performing the 10B / 8B conversion.

[0005] Digital data transmitted as 10-bit word string data under a digital data transmission system such as a fiber channel system is called a "frame" as shown in FIG. 14 for example. It follows the data format in which the smallest independent packet is formed. The "frame" shown in FIG. 14 is entirely composed 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.

[0006] 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 based on the word data arranged immediately before is negative (-).
1111 1010 ", and when the CRD, which is the RD based on the immediately preceding word data, is positive (+), the RD is set to negative," 110000 0101 ". .5
And "110000 0101" is -K2
8.5).

[0010] 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 some standardized digital video signals have been developed. Are known. For example, reproduction of an image screen having an aspect ratio of 16: 9 is performed as follows.
A digital video signal (hereinafter, referred to as a 480P signal) standardized so that the number of lines per each real frame screen is 483 has been proposed. Such a 480P signal is, for example, a video signal. in conjunction with the word multiplex processing to the C _B / C _R data sequence representing a color difference signal component in the Y data sequence and the video signal representing the luminance signal component is performed, a predetermined one of the word multiple data sequence obtained as a result The part is the timing reference code data (SAV: Start of Active Video and EA).
V: End of Active Video).

For such a 480P signal, the frame rate is 60 / 1.001, the sampling frequency is 27 MH, the number of bits per sample is 10 bits, the number of samples per line is 858, and the number of samples per active line is 858. 720, 52 lines per frame
The number of lines per active image is set to 483. Then, the data series constituting the 480P signal is
In the form of 10-bit word string data, for example, FIG.
The data format is as shown in FIG.

FIG. 16 shows a line blanking period in each line period of the 480P signal and a portion corresponding to a part of the video data period before and after the line blanking period. In such a portion, immediately before the portion corresponding to each video data period, SAV, which is timing reference code data composed of four words (3FF, 000,000, XYZ) each having a 10-bit configuration, is arranged. At the same time, immediately after the portion corresponding to each video data period, 4 words (3FF, 000,000, 0
00, XYZ), which is EAV, which is timing reference code data.

The 480P signal converted into a 10-bit quantized digital signal as shown in FIG. 16 is converted into serial data and transmitted when transmitted.

The digital video signal 48 is
Regarding the transmission of the 0P signal, on the transmitting side, based on the 480P signal to be transmitted, 8-bit word string data to which word synchronization data is added is formed. It is desired that the transmission be performed by using a transmission method that is converted into column data and transmitted, for example, from the viewpoint of effectively using existing integrated circuit elements (IC elements) and the like in configuring a transmission / reception circuit. Becomes

[0015]

As described above, on the transmitting side, 8-bit word string data to which word synchronization data is added is formed on the basis of data to be transmitted. If a digital video signal such as a 480P signal can be transmitted by a transmission system which is converted into 10-bit word string data by 8B / 10B conversion and transmitted, efficient use of a digital video signal such as a 480P signal can be achieved. Thus, the use range of a digital video signal such as a 480P signal is expanded.

Efficient use of a digital video signal such as a 480P signal or expansion of a use range of a digital video signal such as a 480P signal is achieved, for example, by a technique in the field of business or home electronic equipment. Bring further development. Therefore, from such a point of view, a means that can be relatively easily prepared is used.
A digital video signal such as an 80P signal is formed into 8-bit word string data to which word synchronizing data is added based on the digital video signal, and the 8-bit word string data is 8B / 1.
Under such a transmission system that the data is converted into 10-bit word string data by the 0B conversion and transmitted, there is a need for a method of transmitting the data so that the data can be reliably reproduced on the receiving side.

However, conventionally, on the transmission side, 8-bit word string data to which word synchronization data is added based on data to be transmitted is formed.
With the transmission mode in which the 8-bit word sequence data are transmitted is converted by the 8B / 10B conversion into 10-bit word sequence data, for example, 480P according to the word multiple data sequence based on the Y data sequence and C _B / C _R data sequence
By means of which signals can be arranged relatively easily,
There is no concrete example that realizes a transmission system capable of transmitting data so that the data can be reliably reproduced on the receiving side. Also, a document describing a technique relating to a transmission system capable of transmitting a digital video signal such as the 480P signal so that the digital video signal can be reliably reproduced on a receiving side by means capable of relatively easily preparing the digital video signal. Can not be found.

In view of the above, according to the invention described in the claims of the present application, 8-bit word string data to which word synchronization data is added is formed based on data to be transmitted, and the 8-bit word string data is formed. Column data is 8B / 10B
By the conversion, the data is converted into 10-bit word string data including 10-bit word data based on the data to be transmitted and 10-bit word synchronization data, and the transmission method is used to transmit the 10-bit word string data to be transmitted. Digital video signals such as 480P signals,
Provided are a data transmission method capable of transmitting data so that the data can be reliably reproduced on a receiving side by means that can be prepared relatively easily, and a data transmission device used for carrying out the method.

[0019]

A data transmission method according to one of the first to ninth aspects of the present invention provides a process for extracting 8 bits at a time from a digital video signal. To obtain 8-bit word string data based on the digital video signal. The 8-bit word string data is separated from the 8-bit word string data at a predetermined word interval by a specific word that is converted into 8-bit word data having a preset code. An additional word data group including the synchronization data is inserted, and 10 bits of the 8-bit word string data into which the additional word data group is inserted.
There is a portion based on the additional word data group including 10-bit word synchronization data having a predetermined positive or negative RD, which is obtained based on the specific word synchronization data by performing conversion to bit word string data. The composite 10-bit word string data is formed, the composite 10-bit word string data is converted into serial data, and the serial data is transmitted for transmission.

In particular, the data transmission method according to the invention described in claim 3 or 4 in the claims of the present application provides a digital video signal from which 8-bit word string data is to be obtained, that is, a digital video signal to be transmitted. The signal is assumed to be a 480P signal.

The data transmission apparatus according to the tenth aspect of the present invention performs a process of extracting 8 bits at a time from a digital video signal to obtain an 8-bit word based on the digital video signal. Column data is obtained, and an additional word data group including specific word synchronization data converted into 8-bit word data having a preset code is inserted into the 8-bit word string data at a predetermined word interval. , An 8-bit word string data forming / synchronizing data inserting means for obtaining 8-bit word string data into which the additional word data group is inserted, and an 8-bit word string data obtained from the 8-bit word string data forming / synchronizing data inserting means. Conversion to 10-bit word string data is performed, and based on the specific word synchronization data. Resulting Te contained 10-bit word synchronizing data with a predetermined positive or negative RD, to form a composite 10-bit word sequence data having a portion based on the additional word data group 8B / 10
Composite 10 obtained from B conversion unit and 8B / 10B conversion unit
Data transmitting means for converting the bit word string data into serial data and transmitting the serial data for transmission.

According to the data transmission method according to any one of the first to ninth aspects of the present invention as described above, the data is converted into serial data and transmitted. In the data transmission method according to the third or fourth aspect of the present invention, the RD is set to a predetermined positive or negative value in the composite 10-bit word string data based on the digital video signal converted to the 480P signal. This means that bit word synchronization data is included. Such 10-bit word synchronous data is, for example, + K which is word data DS10 with RD being positive.
28.5 or word data DS with negative RD
10, which is -K28.5. Then, the RD of the 10-bit word synchronization data included in the composite 10-bit word string data is determined based on whether the word synchronization data detection on the receiving side detects only the word synchronization data whose RD is positive, or not. The value is set in advance to be positive or negative depending on whether only the negative word synchronization data is detected.

Therefore, 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 is detected. The 10-bit word synchronization data is properly detected on the receiving side as word synchronization data required for processing for reproducing a digital video signal such as a 480P signal. It is said. Further, the 10-bit word string data included in the composite 10-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, the receiving side is required for processing for reproducing a digital video signal such as a 480P signal based on composite 10-bit word string data received while obtaining good transmission quality. A state in which the data synchronization state can be reliably obtained is secured.

According to the data transmission method according to any one of the first to ninth aspects of the present invention, RD is set to a predetermined positive or negative value. Conversion of composite 10-bit word string data with an additional word data group including 10-bit word synchronization data to serial data, transmission of the converted serial data, and further, reception and reception of the serial data on the receiving side Conversion of serial data to composite 10-bit 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. Accordingly, 8-bit word string data to which word synchronization data is added is formed based on data to be transmitted, and the 8-bit word string data is converted into 10-bit word string data by 8B / 10B conversion and transmitted. A digital video signal such as a 480P signal is
By using means that can be prepared relatively easily, the data can be transmitted so as to be surely reproduced on the receiving side.

In the data transmission apparatus according to the tenth aspect of the present invention, the data transmission means converts the data into serial data and transmits the serial data. The composite 10-bit word string data based on the video signal includes:
This means that 10-bit word synchronization data with RD being predetermined positive or negative is included. Such 10-bit word synchronization data is, for example, + K28.5 which is word data DS10 having RD positive or -K2 which is word data DS10 having RD negative.
8.5. Then, the RD of the 10-bit word synchronization data included in the composite 10-bit word string data
Depends on whether the word synchronization data detection on the receiving side is to detect only word synchronization data with RD being positive or only word synchronization data with RD being negative. Set to positive or negative.

Therefore, 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 the receiving side detects only the word synchronous data whose RD is negative is detected. The 10-bit word synchronization data is properly detected on the receiving side as word synchronization data required for processing for reproducing a digital video signal such as a 480P signal. It is said. Further, the 10-bit word string data included in the composite 10-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, the receiving side is required for processing for reproducing a digital video signal such as a 480P signal based on composite 10-bit word string data received while obtaining good transmission quality. A state in which the data synchronization state can be reliably obtained is secured.

According to the data transmission apparatus according to the tenth aspect of the present invention, the RD is set to a predetermined positive or negative value.
Conversion of composite 10-bit word string data with additional word data groups including 0-bit word synchronization data to serial data, transmission of the converted serial data, and reception and reception of serial data on the receiving side Conversion of serial data to composite 10-bit 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. Accordingly, 8-bit word string data to which word synchronization data is added is formed based on data to be transmitted, and the 8-bit word string data is converted into 10-bit word string data by 8B / 10B conversion and transmitted. With the transmission method to be transmitted, a digital video signal such as a 480P signal can be transmitted so that it can be reliably reproduced on the receiving side by using means that can prepare the signal relatively easily.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a data transmission method in which an example of a data transmission method according to the invention described in any one of claims 1 to 9 in the claims of the present application is implemented. An example of the data transmission device according to the invention described in claim 10 in the range of FIG.

In the example shown in FIG. 1, a 480P signal DVP, which is a digital video signal, is supplied to the composite 10-bit word string data forming unit 11. The 480P signal DVP is, for example, a 10-bit quantized digital signal taking the form of a data series as shown in FIG. 16, and is a parallel data having a word transmission rate of, for example, 54 MBps.

Compound 10-bit word string data forming section 11
In, the 480P signal DVP is supplied to the 8-bit word string data formation / synchronization data insertion unit 12. The 8-bit word string data formation / synchronization data insertion unit 12
A line synchronization signal SH and a field synchronization signal SV synchronized with the line period and the field period of the 80P signal DVP, a clock pulse signal CA having a frequency of 54 MHz, and a clock pulse signal CB having a frequency of 106.25 MHz are also supplied. , The additional word data group DWS from the word data sending unit 13 is supplied. The additional word data group DWS is composed of a plurality of 8-bit word data including 8-bit word synchronization data.
This is parallel data of 25 MBps.

The 8-bit word string data forming / synchronizing data inserting section 12 converts the data into 10-bit word string data using the line synchronization signal SH and the field synchronization signal SV, and further using the clock pulse signals CA and CB. Each bit data is added to the 480P signal DVP in which 10 bits forming each word sequentially arrive.
A process of sequentially taking out 8 bits at a time based on V is performed,
For example, in A of FIG. 2, D / 0 to D / 7, D / 8 to D
/ 15, D / 16 to D / 23, ... (D / 0,
.., D / 23,... Represent each bit data), so that 8-bit word data is sequentially formed.
Bit word data is formed continuously, and 8-bit word string data DZ '(8) having a word transmission rate of 106.25 MBps is obtained.

Further, in the 8-bit word string data forming / synchronizing data inserting section 12, the 8-bit word string data DZ '(8) obtained based on the 480P signal DVP is obtained.
, An additional word data group DWS including 8-bit word synchronization data from the word data sending unit 13 is inserted at a predetermined word interval, and
Based on the 80P signal DVP, composite 8-bit word string data DZ (8) including an additional word data group DWS and having a word transmission rate of 106.25 MBps is formed as shown in FIG. 2B. Note that the arrow t in FIG. 2 indicates the passage of time.

FIG. 3 shows a specific configuration example of the 8-bit word string data forming / synchronizing data inserting unit 12. In the example shown in FIG. 3, the 480P signal DVP is supplied to the switch 15. The control signal CSA from the switch control signal forming unit 16 is also supplied to the switch 15.

The switch control signal forming unit 16 is supplied with the line synchronization signal SH, the field synchronization signal SV, and the clock pulse signal CB.
Is, for example, EAV in the 480P signal DVP according to the line synchronization signal SH and the field synchronization signal SV.
, And a control signal CSB synchronized with a period that is an integral multiple of the cycle of the clock pulse signal CB.

The switch 15 is connected to a memory unit 17 and a memory unit 18. Then, the switch 15 responds to the control signal CSA in the 480P signal DVP.
For example, switching is performed at the beginning of each of five line periods starting from the EAV, whereby the 480P signal DVP
Are alternately supplied to the memory unit 17 and the memory unit 18 for five line periods starting from the EAV to distribute the 480P signal DVP to the memory unit 17 and the memory unit 18.

In connection with the memory units 17 and 18,
A memory control signal forming unit 19 is provided. The memory control signal forming unit 19 includes clock pulse signals CA and C
B is supplied. Then, the memory control signal forming unit 19
Sets the frequency to 54 based on the clock pulse signal CA.
A write control signal QW having a frequency of 106.2 MHz and a frequency of 106.2 based on a clock pulse signal CB are generated.
A read control signal QR of 5 MHz is generated, and the write control signal QW and the read control signal QR are supplied to both the memory units 17 and 18.

Thus, in the memory section 17, during the period in which the 480P signal DVP is supplied through the switch 15, the 480P signal DVP starts from the EAV.
The line period is written in a state where the word transmission rate is 54 MBps according to the write control signal QW having the frequency of 54 MHz. Further, even in the memory unit 18, in the period in which the 480P signal DVP is supplied through the switch 15, five line periods starting from the EAV of the 480P signal DVP correspond to the write control signal QW having a frequency of 54 MHz. 54MBp word transmission rate
s is written. Therefore, the word transmission rate of the 480P signal DVP in the memory units 17 and 18 for 5 line periods starting from the EAV is set to 54 MB.
Writing in the state of ps is performed alternately according to the switching of the switch 15 performed at the beginning of each of the five line periods starting from EAV in the 480P signal DVP.

The five-line period starting from EAV of the 480P signal DVP written in the memory unit 17 has a frequency of 106.25 MHz during the five-line period starting from EAV in the 480P signal DVP following the writing period.
In accordance with the read control signal QR as z, the data is read from the memory unit 17 by 8 bits at a time to form an 8-bit word sequentially. Thereby, 8-bit word string data DZ ′ (8) having a word transmission rate of 106.25 MBps is obtained from the memory unit 17 and supplied to the switch 20.

The 480 written in the memory unit 18
The EAV of the 480P signal DVP following the writing period also corresponds to the 5-line period starting from the EAV of the P signal DVP.
In the five line periods starting from, the frequency is set to 106.2.
In response to the read control signal QR of 5 MHz, the memory unit 1
The bits are read from 8 to 8 bits at a time to form an 8-bit word sequentially. As a result, 8-bit word string data DZ ′ (8) having a word transmission rate of 106.25 MBps is obtained from the memory unit 18 and supplied to the switch 20.

The switch 20 has a word data transmitting unit 1
3, an additional word data group DWS with a word transmission rate of 106.25 MBps is also provided.

The switch 20 changes the word transmission rate from the word data transmission unit 13 to 106.25 Mbps in response to the control signal CSB from the switch control signal formation unit 16.
Additional word data group DWS, memory unit 18
8-bit word string data DZ '(8) with a word transmission rate of 106.25 MBps from the memory unit 17
, And the 8-bit word string data DZ ′ (8) whose word transmission rate is 106.25 MBps is sequentially extracted. Thus, the switch 20 generates an additional word data group DWS having a word transmission rate of 106.25 MBps at a predetermined word interval from the 8-bit word string data DZ ′ (8) having a word transmission rate of 106.25 MBps. The composite 8-bit word string data DZ (8) formed by insertion is derived.

As described above, the composite 8-bit word string data DZ (8) derived from the switch 20 is supplied from the 8-bit word string data forming / synchronizing data inserting section 12 to 8B
The 8B / 10B converter 2 is supplied to the
8B converted to 10 bits every 8 bits in 1
/ 10B conversion.

The additional word data group DWS having a word transmission rate of 106.25 MBps from the word data transmission unit 13 is constituted by a plurality of 8-bit word data including 8-bit word synchronization data. Arbitrary 8-bit word data DE
X8, three 8-bit word synchronization data DEK8 and eight 8-bit word auxiliary data DEA8 are alternately arranged and connected, and further, at least one arbitrary 8-bit word data DEX8 is connected thereto. Is done.

The 8-bit word synchronization data DEK8 is 1
When converted to 0-bit word data, it is 8-bit word data which is the above-described word data DS10. Therefore, when the word synchronization data DEK8 is converted into 10-bit word data, it is called with a code name of K28.5. When the CRD, which is the RD of the word data arranged immediately before, is negative (-), + K2
8.5, and when the CRD, which is the RD based on the word data arranged immediately before, is positive (+), -K2
8.5.

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

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

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. 5A.
In FIG. 5A, DV8 represents each 8-bit word data forming the 8-bit word string data DZ '(8) read from each of the memory units 17 and 18 shown in FIG. The data is converted into 10-bit word data DV10 by the / 10B conversion.

The additional word data group DWS having a word transmission rate of 106.25 MBps from the word data transmission unit 13 includes, for example, 8-bit word synchronization data DEK at each of the start end and the end.
8 and 8-bit word auxiliary data DEA8 are alternately arranged three by three, and at least one 8-bit word data for inverting RD is arranged in a portion between the start end portion and the end portion. It is assumed.

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. 6A.
Also in FIG. 6A, DV8 represents each 8-bit word data forming 8-bit word string data DZ '(8) read from each of the memory units 17 and 18 shown in FIG. The data is converted into 10-bit word data DV10 by the 8B / 10B conversion.

The 8B / 10B converter 21 converts the composite 8-bit word string data DZ (8) from the 8-bit word string data formation / synchronization data insertion section 12 into 8B / 10B data.
After conversion, composite 8-bit word string data DZ (8)
, Forming composite 10-bit word string data DZ (10) having a word transmission rate of 106.25 MBps. At this time, the 8-bit word synchronization data DEK (8)
Is converted to K28.5, and the 8-bit word auxiliary data DEA (8) is converted to D21.3, and
Arbitrary 8-bit word data DEX8 is converted to 10-bit word data DXX. Converted to X.

Therefore, composite 8-bit word string data D
Z (8) additional word data group DWS inserted
Is as shown in FIG. 5A, the composite 1
When the 0-bit word string data DZ (10) has a portion based on the additional word data group DWS and the immediately preceding 10-bit word data DV10 makes RD positive (+), as shown in FIG. 5B. (Or as shown in FIG. 5C),
On the other hand, the immediately preceding 10-bit word data DV10 is R
When D is negative (-), the value is as shown in FIG. 5C (or as shown in FIG. 5B).

The composite 8-bit word string data DZ
Additional word data group DWS inserted in (8)
Is as shown in FIG. 6A, the composite 1
As shown in FIG. 6B, the 0-bit word string data DZ (10) has a portion based on the additional word data group DWS when the immediately preceding 10-bit word data DV10 makes RD positive (+). While the immediately preceding 10-bit word data DV
When RD is negative (-), 10 is as shown in FIG. 6C.

In addition to the above, the additional word data group DWS whose word transmission rate from the word data transmission unit 13 is 106.25 MBps is different from the above-mentioned example, for example, a predetermined number of arbitrary 8-bit word data. D
EX8 is followed by 8-bit word synchronization data DEK8, and the 8-bit word synchronization data DEK8 is followed by arbitrary 8-bit word data DEX8. The 8-bit word data DEX8 immediately before the 8-bit word synchronization data DEK8 is 8B. It is set to be 10-bit word data -DXX.X in which RD is negative (-) when converted to / 10B.

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. 7A.

An additional word data group DWS with a word transmission rate of 106.25 MBps from the word data transmission unit 13 is, for example, another example.
The first 8-bit word synchronization data DEK8 is followed by a predetermined number of arbitrary 8-bit word data DEX8, the predetermined number of arbitrary 8-bit word data DEX8 is followed by the second 8-bit word synchronization data DEK8, and The arbitrary 8-bit word data DEX8 follows the 8-bit word synchronous data DEK8, and when the 8-bit word data DV8 immediately before the first 8-bit word synchronous data DEK8 is converted into 8B / 10B, RD is negative ( -), Which is set to be 10-bit word data DV10, and 8-bit word data DEX8 up to the second 8-bit word synchronization data DEK8.
Immediately before the second 8-bit word synchronization data DEK8, when RD is negative (−) when 8B / 10B conversion is performed.
10-bit word data-DXX.X.

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. 8A.

Composite 8-bit word string data DZ (8)
However, when the portion where the additional word data group DWS is inserted is as shown in FIG. 7A,
8B / 1 is added to the composite 8-bit word string data DZ (8).
The composite 10-bit word string data DZ (10) obtained from the 8B / 10B converter 21 that performs the 0B conversion is represented by B
And the additional word data group DW
It is assumed that the portion based on S includes + K28.5 which makes RD positive (+). The composite 8-bit word string data DZ (8) is added to the additional word data group DW.
If the portion where S is inserted is as shown in FIG. 8A, the composite 8-bit word string data DZ
8B / 10B conversion unit 2 for performing 8B / 10B conversion on (8)
1, the composite 10-bit word string data DZ (1
0) is as shown in FIG. 8B, and the first 8-bit word synchronization data DEK8 and the second 8-bit word synchronization data DEK in the additional word data group DWS are added to the portion based on the additional word data group DWS.
+ K28. The two RDs being positive (+) based on
5 is included.

The composite 8-bit word string data DZ
(8), if the portion into which the additional word data group DWS is inserted is as shown in FIG. 7A or as shown in FIG. 8A, the additional word data group DWS is used. DWS sets the RD to positive (+) in a portion based on the additional word data group DWS in the composite 10-bit word sequence data DZ (10) obtained by subjecting the composite 8-bit word sequence data DZ (8) to 8B / 10B conversion. )), That is, the one that will contain + K28.5. However, in some cases,
In the composite 8-bit word string data DZ (8), the portion in which the additional word data group DWS is inserted is the same as that shown in FIG. 7A or that shown in FIG. 8A. The additional word data group DWS is added to the composite 10-bit word string data DZ (10) obtained by subjecting the composite 8-bit word string data DZ (8) to 8B / 10B conversion. In the part based on the word data group DWS,
It may be selected to include 10-bit word synchronization data with RD being negative (-), that is, -K28.5.

Under the above conditions, the composite 10-bit word string data DZ (10) formed in the 8B / 10B conversion section 21 is sent out from the composite 10-bit word string data formation section 11 and is subjected to P / S It is supplied to the conversion unit 22.
The P / S conversion unit 22 performs P / S conversion on the composite 10-bit word string data DZ (10) to increase the bit transmission rate based on the composite 10-bit word string data DZ (10) to 106.25 Mbps. × 10 = 1.0625G
It forms serial data DZS at bps and supplies the serial data DZS to the transmission signal forming unit 23. The transmission signal forming unit 23 transmits the serial data DZS through, for example, a data transmission path formed by using an optical fiber, and an optical signal suitable for a data transmission path formed by using an optical fiber. Transmit as SZ. Thereby, transmission of the serial data DZS is performed.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S converter 22 and the transmission signal generator 2
3 converts the composite 10-bit word string data DZ (10) having a word transmission rate of 106.25 MBps to serial data DZS having a bit transmission rate of 1.0625 Gbps and transmits the data. / S conversion unit 22 and transmission signal formation unit 23 are, for example,
Integrated circuits provided for transmission of digital video signals under fiber channel systems (I
C) It can be configured by effectively utilizing the elements. Therefore, 8-bit word string data to which word synchronization data is added based on the data to be transmitted is formed, which is converted to 10-bit word string data by 8B / 10B conversion and transmitted to be transmitted. According to the method, a digital video signal such as a 480P signal can be transmitted so as to be surely reproduced on the receiving side by means capable of relatively easily preparing the digital video signal.

FIG. 9 shows a composite 10-bit word string transmitted from the transmission signal forming unit 23 in the data transmission apparatus shown in FIG. 1 according to the example of the data transmission method according to the invention described in the claims of the present application. 1 shows an example of a data receiving device that receives an optical signal SZ based on serial data DZS obtained by converting data DZ (10).

In the example of the data receiving apparatus shown in FIG. 9, for example, a receiving section 25 for receiving an optical signal SZ transmitted through a data transmission line formed using an optical fiber is provided. 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, + K28.5 (or -K28.5), which is 10-bit word data in the serial data DZS, is used.
Detects the part converted into serial data as synchronous data, performs word synchronization based on the detected synchronous data, performs S / P conversion on serial data DZS, and performs A / C in FIG. A or C, as shown in FIG. 12A or FIG. 13A, for example, compound 10-bit word string data DZ (10) which is parallel data having a word transmission rate of 106.25 MBps.
To form The composite 1 shown in A or C of FIG. 10, A or C of FIG. 11, A of FIG. 12 or A of FIG.
The 0-bit word string data DZ (10) is selectively formed according to the contents of the additional word data group DWS and the RD of the data immediately before the additional word data group DWS. The composite 10-bit word string data DZ (10) obtained from the synchronous data detection / S / P converter 26
Is supplied to the 10-bit word string data restoration unit 27.

The synchronous data detection / S / P converter 26
, The composite 10-bit word string data DZ (1
+ K in the additional word data group DWS in 0)
28.5 (or -K28.5) is detected as synchronous data, and a synchronous data detection output signal SWS is transmitted.
This synchronous data detection output signal SWS is based on the contents of the additional word data group DWS and the additional word data group D in the composite 10-bit word string data DZ (10).
According to the RD of the data immediately before WS, for example, it is obtained as shown in B or D in FIG. 10, B or D in FIG. 11, B in FIG. 12 or B in FIG. In this way, the synchronous data detection output signal SWS obtained from the synchronous data detection / S / P conversion unit 26 is
Supplied to In the control signal forming section 28, a synchronization control signal CW based on the synchronization data detection output signal SWS is formed.

The 10-bit word string data recovery section 27 to which the composite 10-bit word string data DZ (10) is supplied from the synchronization data detection / S / P conversion section 26 has a synchronization control signal from the control signal forming section 28. CW is also provided. Then, in the 10-bit word string data restoration unit 27,
The composite 10-bit word string data DZ (10) is 10B /
The data is supplied to the 8B conversion unit 29, and the 10B / 8B conversion unit 29 performs 10B / 8B conversion on the composite 10-bit word string data DZ (10), thereby performing a composite 8-bit word having a word transmission rate of 106.25 MBps. Column data DZ (8) is formed.

At this time, the 10-bit word data DV1 included in the composite 10-bit word string data DZ (10)
0 is converted to 8-bit word data DV8. Also, ± DXX · X, ± K, which are 10-bit word data included in a portion based on the additional word data group DWS in the composite 10-bit word string data DZ (10),
28.5 and D21.3 are 8-bit data DE, respectively.
It is converted into X8, 8-bit word synchronous data DEK8 and 8-bit word auxiliary data DEA8. As a result, 1
The composite 8-bit word string data DZ (8) obtained in the 0B / 8B conversion unit 29 is the composite 8-bit word string data shown in FIG. 5A, FIG. 6A, FIG. 7A or FIG. This is equivalent to data DZ (8).

The composite 8-bit word string data DZ (8) from the 10B / 8B converter 29 is divided into word data
The data is supplied to the 0-bit word string data forming unit 30. The synchronization control signal CW from the control signal forming unit 28 is also supplied to the word data separation / 10-bit word string data forming unit 30. Then, in the word data separation / 10-bit word string data forming section 30, the word transmission rate is set to 106.25 from the composite 8-bit word string data DZ (8) under the control of synchronization by the synchronization control signal CW.
8-bit word string data DZ '(10) with MBps
Bit data DEX8 and 8-bit word synchronization data DE forming the additional word data group DWS
K8 and 8-bit word auxiliary data DEA8 are separated and taken out.

Further, in the word data separation / 10-bit word string data forming section 30, the 8-bit word string data DZ '(8) extracted from the composite 8-bit word string data DZ (8) is Each bit data is
10-bit word data is sequentially formed by performing a process of sequentially taking out 10 bits at a time on the basis of the AV, whereby the 10-bit word data is formed continuously, and a 10-bit word string having a word transmission rate of 54 MBps The data 480P signal DVP is obtained. In this case, the 8-bit word string data DZ '(8) is subjected to a process of sequentially extracting each bit data by 10 bits on the basis of the EAV to form 10-bit word data in order, for example, by 8 bits. The word string data DZ '(8) is stored in the memory means for a predetermined period,
A write control signal with a frequency of 106.25 MHz is written according to a write control signal, and a read control signal with a frequency of 54 MHz from the memory means for a predetermined period of 8-bit word string data DZ '(8) written in the memory means. , A process of reading out 10 bits at a time is performed.

In this way, the word data separation 10
48 obtained in the bit word string data forming unit 30
The 0P signal DVP is a 10-bit word string data restoration unit 2
7 is output as a restored output signal, and the 480P signal DV is output.
P will be reproduced.

An example of the data transmission method according to any one of the first to ninth aspects of the present invention is shown in FIG.
The digital video signal supplied to the 8-bit word string data forming / synchronizing data inserting unit 12 in one example of the data transmission device described in claim 10 of the present application, that is, the digital video signal to be transmitted is ,
480P signal. However, the data transmission method according to any one of claims 1 to 9 in the claims of the present application and the data transmission according to the invention described in claim 10 in the claims of the present application In the apparatus, the digital video signal to be transmitted does not need to be limited to the 480P signal. For example, a signal called "720P", 10 bits 4: 2:
2 component digital signal (D1 signal), 4fs
A digital video signal such as a c-composite digital signal (D2 signal) or an HD signal under an HDTV system can be used as a digital video signal to be transmitted.

[0071]

As is apparent from the above description, according to the data transmission method according to any one of the first to ninth aspects of the present invention,
The composite 10-bit word string data based on a digital video signal converted to serial data and transmitted as, for example, a 480P signal as in the data transmission method according to the invention according to claim 3 includes RD. , The RD of such 10-bit word synchronization data is detected by the receiving-side word synchronization data, and the RD is determined to be positive. It is set to be positive or negative in advance depending on whether only the word synchronization data is detected or only the word synchronization data with RD being negative is detected.

Therefore, 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 is detected. The 10-bit word synchronization data is properly detected on the receiving side as word synchronization data required for processing for reproducing a digital video signal such as a 480P signal. The 10-bit word string data included in the composite 10-bit word string data is obtained through an 8B / 10B conversion process, thereby providing good transmission quality. Therefore, the receiving side is required for processing for reproducing a digital video signal such as a 480P signal based on composite 10-bit word string data received while obtaining good transmission quality. A state in which the data synchronization state can be reliably obtained is secured.

According to the data transmission method according to any one of the first to ninth aspects of the present invention, RD is set to a predetermined positive or negative value. Conversion of composite 10-bit word string data with an additional word data group including 10-bit word synchronization data to serial data, transmission of the converted serial data, and further, reception and reception of the serial data on the receiving side The conversion of serial data into composite 10-bit word string data can be performed using, for example, a transmission circuit device used for transmitting and receiving a digital video signal under a fiber channel system. 8-bit word string data to which word synchronization data is added based on data to be performed A digital video signal such as a 480P signal is formed relatively easily by a transmission method which is formed and transmitted so that the 8-bit word string data is converted into 10-bit word string data by 8B / 10B conversion and transmitted. The transmission can be performed so that the data can be reliably reproduced on the receiving side by using the means that can be used.

In the data transmission apparatus according to the tenth aspect of the present invention, the data transmission means converts the data into serial data and transmits the serial data. The composite 10-bit word string data based on the video signal includes:
10-bit word synchronization data having a predetermined positive or negative RD is included, and the RD of the 10-bit word synchronization data included in the composite 10-bit word string data is the word synchronization on the receiving side. It is set to be positive or negative in advance depending on whether the data detection is to detect only the word synchronization data with RD being positive or only the word synchronization data with RD being negative. .

Therefore, 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 the receiving side detects only the word synchronous data whose RD is negative is detected. The 10-bit word synchronization data is properly detected on the receiving side as word synchronization data required for processing for reproducing a digital video signal such as a 480P signal. The 10-bit word string data included in the composite 10-bit word string data is obtained through an 8B / 10B conversion process, thereby providing good transmission quality. Therefore, the receiving side is required for processing for reproducing a digital video signal such as a 480P signal based on composite 10-bit word string data received while obtaining good transmission quality. A state in which the data synchronization state can be reliably obtained is secured.

According to the data transmission apparatus according to the tenth aspect of the present invention, RD is set to a predetermined positive or negative value.
Conversion of composite 10-bit word string data with additional word data groups including 0-bit word synchronization data to serial data, transmission of the converted serial data, and reception and reception of serial data on the receiving side Conversion of serial data to composite 10-bit word string data and the like can be performed using, for example, a transmission circuit device used for transmitting and receiving a digital video signal under a fiber channel system, and transmitted. The 8-bit word string data to which the word synchronization data is added is formed based on the power data, and the 8-bit word string data is converted into 10 bits by 8B / 10B conversion.
A digital video signal, such as a 480P signal, can be reliably reproduced on the receiving side by means of a transmission system which is transmitted so as to be converted into bit word string data and transmitted, using means capable of relatively easily preparing a digital video signal. Can be transmitted to

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a data transmission method according to an embodiment of the present invention; FIG. 1 is a block diagram illustrating a data transmission method according to an embodiment of the present invention; FIG. 3 is a block diagram illustrating an example of a data transmission device according to the described invention.

FIG. 2 is a time chart for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 9 in the claims of the present application.

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

FIG. 4 is a conceptual diagram for explaining 8-bit word auxiliary data used in an example of the data transmission method according to any one of claims 1 to 9 in the claims of the present application. It is.

FIG. 5 is a time chart for explaining an example of a data transmission method according to any one of the first to ninth aspects of the present invention.

FIG. 6 is a time chart for explaining an example of a data transmission method according to the invention described in any one of claims 1 to 9 in the claims of the present application.

FIG. 7 is a time chart for explaining an example of the data transmission method according to the invention described in any one of claims 1 to 9 in the claims of the present application.

FIG. 8 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 9 in the claims of the present application.

FIG. 9 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 ninth aspects of the present invention. It is a block block diagram.

FIG. 10 is a time chart used for describing the operation of the data receiving apparatus shown in FIG. 9;

FIG. 11 is a time chart used for describing the operation of the data receiving apparatus shown in FIG. 9;

FIG. 12 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 9;

FIG. 13 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 9;

FIG. 14 is a conceptual diagram serving to explain a “frame” used in transmitting digital data.

FIG. 15 is a conceptual diagram serving to explain word synchronization data used in transmitting digital data.

FIG. 16 is a conceptual diagram explaining an example of a data format of a digital video signal.

[Explanation of symbols]

11 ... composite 10-bit word string data forming unit, 1
2 ... 8-bit word string data formation / synchronous data insertion unit, 13 ... word data transmission unit, 15, 20,
..Switch, 16 ... Switch control signal forming unit,
17, 18: memory unit, 19: memory control signal forming unit, 21: 8B / 10B conversion unit, 22
... P / S converter, 23 ... Transmission signal generator,
25: receiving unit, 26: synchronous data detection, S /
P conversion unit, 27 ... 10-bit word string data restoration unit, 28 ... control signal formation unit, 29 ... 10B
/ 8B conversion unit, 30... Word data separation / 10-bit word string data formation unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 11/04 H04N 7/13 Z F-term (Reference) 5C057 AA03 BA04 BA11 CA00 CB08 DA06 EA06 EA09 EB02 EB03 EB11 EB16 EL01 EN01 EN03 GF08 GG04 GG06 GG07 5C059 KK00 PP04 PP16 RA02 RC02 SS03 UA02 UA05 5K029 EE06 HH26 5K047 DD02 FF17 HH12 HH44 LL02 LL04

Claims (10)

[Claims] 1. A digital video signal is subjected to a process of extracting 8 bits at a time to obtain an 8 bit signal based on the digital video signal.
While obtaining the bit word string data, an additional word data group including the specific word synchronizing data as the 8-bit word data having a predetermined code is provided at a predetermined word interval in the 8-bit word string data. The 8-bit word string data into which the additional word data group has been inserted is converted into 10-bit word string data, and the running disparity obtained based on the specific word synchronization data is determined in advance. Forming composite 10-bit word string data having a portion based on the additional word data group, including positive or negative 10-bit word synchronization data, and converting the composite 10-bit word string data into serial data. And a data transmission method for transmitting the serial data for transmission. 2. The data transmission method according to claim 1, wherein the digital video signal is a signal having a data format of 10-bit word string data. 3. A digital video signal having an aspect ratio of 1
3. The data transmission method according to claim 2, wherein the signal is standardized so as to be used for reproduction under the condition that the number of active lines for an image screen of 6: 9 is substantially 483. 4. Each of the digital video signals has a frame rate of 60 / 1.001 and a sampling frequency of 27M.
Hz, 1 Y data sequence lines per number of samples and 525 the number per 858,1 frame line and a C _B / C _R data series and wherein the forming a signal obtained by multiplexing claim 3, wherein Data transmission method. 5. An additional word data group is selected as a part based on the additional word data group in the composite 10-bit word string data, which includes 10-bit word synchronous data having a positive running disparity. The data transmission method according to any one of claims 1 to 4, wherein the data transmission is performed. 6. The additional word data group is selected as a part based on the additional word data group in the composite 10-bit word string data, which includes 10-bit word synchronous data having a negative running disparity. The data transmission method according to any one of claims 1 to 4, wherein the data transmission is performed. 7. The supplementary word data group includes auxiliary word data. When the auxiliary word data is converted into 10-bit words, the auxiliary word data is converted into 10-bit word data having a running disparity of neutral. 2. The method of claim 1, wherein
The data transmission method according to any one of claims 1 to 6. 8. The 8-bit word data immediately before the 8-bit word synchronization data, which is regarded as 10-bit word synchronization data when the bit conversion into a 10-bit word is performed, is converted into a 10-bit word. 6. The data transmission method according to claim 5, wherein when the bit conversion is performed, the data is set to be set so as to be converted into 10-bit word data having a negative running disparity. 9. An 8-bit word data immediately before an 8-bit word synchronous data which is converted to a 10-bit word synchronous data when the bit conversion into a 10-bit word is performed is converted into a 10-bit word. 7. The data transmission method according to claim 6, wherein when the bit conversion is performed, the data is set to be set so as to be converted into 10-bit word data having a positive running disparity. 10. A digital video signal is processed to take out 8 bits at a time to obtain 8-bit word sequence data based on the digital video signal, and a predetermined word interval is provided between the 8-bit word sequence data. An additional word data group including specific word synchronization data, which is 8-bit word data having a preset code, is inserted.
8-bit word string data forming / synchronizing data inserting means for obtaining bit word string data, and converting the 8-bit word string data obtained from the 8-bit word string data forming / synchronizing data inserting means into 10-bit word string data. And including 10-bit word synchronization data obtained based on the specific word synchronization data and having a predetermined positive or negative running disparity.
8 bits / 10 to form composite 10-bit word string data having a portion based on the additional word data group
A data transmission device comprising: a bit conversion unit; and data transmission means for converting composite 10-bit word string data obtained from the 8-bit / 10-bit conversion unit into serial data and transmitting the serial data for transmission.