JP2000350201A - Method and device for data transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce and multiplex multiple digital video signals in the formats of a Y data series and a PB/PR series and to transmit them after 8B/10B conversion by a means which is prepared relatively easily. SOLUTION: A word string data is obtained by multiplexing multiple digital video signals, an 8-bit/10-bit converting process is performed for the word string data, and 20-bit word string data is generated and processed by transmission rate conversion; and additional word data groups including 20-bit word synchronizing data given a preset code are inserted at specific word intervals to generate composite 20-bit word string data, which is converted 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 performs a multiplexing process and an 8-bit / 10-bit conversion process on a plurality of digital video signals to obtain 20-bit word string data. A data transmission method for forming composite 20-bit word string data by inserting an additional word data group including word synchronization data into the obtained 20-bit word string data and transmitting the composite 20-bit word string data for transmission, and The present invention relates to a data transmission device provided for implementation.

[0002]

2. Description of the Related Art Digital data representing various kinds of signal information is transmitted in a system for transmitting digital data as an electric signal through a transmission line formed by using a coaxial cable or twisted pair line, or a digital data transmission system. There has been proposed a system that converts an optical signal into an optical signal and transmits the optical signal through a transmission line formed using an optical fiber. And
Digital data handled under such a digital data transmission system is, for example, several hundred Mbps to 1 Gbps.
Serial data having a bit transmission rate (bit rate) of about

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) to obtain 10-bit word string data. And what is actually transmitted is 8B / 10B
The 10-bit word string data formed by the conversion is converted into serial data obtained by further performing a parallel / serial conversion (P / S conversion) process.

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.

[0005] In transmitting such digital data, in order to make the 10B / 8B conversion performed on the reception side proper, it is necessary to accurately grasp each of the 10 bits formed by the 8B / 10B conversion on the transmission side. Therefore, it is assumed that 10-bit word string data converted into serial data and transmitted is appropriately inserted with word synchronization data on the transmission side. The word synchronization data is a 10-bit word data, but has a specific code that is not used as the 10-bit word data for transmitting information.

As described above, data transmission in which digital data to be transmitted is subjected to 8B / 10B conversion is recognized as providing good transmission quality.

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. High Definition Television (HDT
V) Systems and the like have been proposed. A digital video signal such as a digitized video signal under the HDTV system follows a data format as shown in FIG. 12, for example.

[0008] The data format of the digital video signal shown in FIG. 12 is a brightness signal data sequence (Y data sequence) representing a brightness signal component in the video signal as shown in FIG. And a color difference signal data sequence (P _B / P _R data sequence) representing a color difference signal component in the video signal, and the Y data sequence and the P _B / P _R data sequence are
It represents luminance signal information data forming a digital video signal and color difference signal information data forming a digital video signal.

Each of the word data forming each of the Y data sequence and the P _B / P _R data sequence has a 10-bit configuration. That is, each of the color difference signal information data represented as luminance signal information data and the P _B / P _R data sequence represented as Y data sequence, quantization with 10-bit word is digital image information data has been made. FIG. 12A shows a horizontal blanking period portion in each horizontal period portion of the Y data sequence and a part of a video data period portion before and after the horizontal blanking period portion, and FIG. has been shown a portion corresponding to a portion of the video data period portions in the horizontal blanking period section and the front and rear thereof in each horizontal period portion in P _B / P _R data sequence.

In the Y data series, immediately before a portion corresponding to each video data period, four words (3FF (Y), 000 (Y), 000) each having a 10-bit configuration.
(Y), XYZ (Y); each of 3FF and 000 is 1
In hexadecimal notation, "h" indicating hexadecimal notation is added and written as 3FFh and 000h, and (Y) indicates a word in the Y data series. ) Timing reference code data (SA
V: Start of Active Video) is arranged, and immediately after a portion corresponding to each video data period, 4 words (3FF (Y), 000) each having a 10-bit configuration.
(Y), 000 (Y), XYZ (Y)) timing reference code data (EAV: End of Active Video)
) Is arranged. Similarly, also in the P _B / P _R data sequence, just before the portion corresponding to the respective video data period,
Four words (3FF) each having a 10-bit configuration
(C), 000 (C), 000 (C), XYZ (C);
(C) represents that the word in P _B / P _R data sequence. ), And immediately after a portion corresponding to each video data period, 4 words (3FF (C), 000) each having a 10-bit configuration.
EAV consisting of (C), 000 (C), XYZ (C))
Is arranged. Of course, EAV and SAV in Y data series
Each is arranged in each horizontal blanking period portion in the Y data sequence and, EA in P _B / P _R data sequence
Husband V and SAV s are arranged in each horizontal blanking period portion of P _B / P _R data sequence.

[0011] In such Y data sequence and P _B / P _R data sequence is transmitted, Y data sequence and P _B /
P to _R data sequence, word multiplexing process at Moto horizontal blanking period portions each of EAV and SAV are disposed has been made to synchronization is subjected, the word multiple data series as shown in FIG. 13, 10 It is formed as a bit quantized digital signal. In the word multiplexed data series, immediately before each video data period portion, 8 words (3FF (C), 3FF (Y),
000 (C), 000 (Y), 000 (C), 000
(Y), XYZ (C), XYZ (Y)) are provided, and 8 words each having a 10-bit configuration are provided immediately after each video data period portion. (3FF (C), 3FF
(Y), 000 (C), 000 (Y), 000 (C),
000 (Y), XYZ (C), XYZ (Y)) are provided.

The digital video signal in the form of a word multiplexed data series is converted from parallel data to serial data and subjected to, for example, scramble processing and transmitted in the form of a transmission signal which is converted into an electric signal or an optical signal. Is done.

In the scrambling process in this case, the serial data to be processed is represented by a polynomial, which is sequentially divided by a primitive polynomial, for example, a ninth-order primitive polynomial: X ⁹ + X ⁴ +1. The quotient resulting from the operation is obtained as transmission data, the mark ratio of transmission data (the ratio of "0" and "1") is statistically reduced to 1/2 on average, and the transmission data is expressed by a primitive polynomial. This is a process for performing encryption. In actual transmission of transmission data, for example, instead of directly transmitting a quotient obtained by division by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1, the quotient is further divided by an expression: X + 1. The transmission data is data (polarity-free data) in which it and the inverted data have the same information.

On the receiving side receiving the transmission data, the received transmission data is subjected to a descrambling process by multiplying the received transmission data by an expression: X + 1 and further by a primitive polynomial: X ⁹ + X ⁴ +1 to convert the original serial data. Reproduce.

[0015]

BRIEF Problem to be Solved] In the digital video signal in the form of such Y data sequence and P _B / P _R data sequence, not Upon its transmission, for a single digital video signal only, a plurality Digital video signal is multiplexed so that it can be reproduced.
If transmission can be performed by performing B conversion, efficient use of digital video signals can be achieved while obtaining good transmission quality, and the range of use of digital video signals can be expanded. . Efficient use of digital video signals or expansion of the range of use of digital video signals, for example, will result in further development of technology in the field of business or household electronic devices. Therefore, from such a viewpoint, it is desired to take a measure capable of relatively multiplexing a plurality of digital video signals in a reproducible manner and performing 8B / 10B conversion and transmitting them by means that can be prepared relatively easily.

However, conventionally, the above-described Y
For digital video signal as the digital video signal in the form of data sequences and P _B / P _R data sequence,
Multiple of them are reproducibly multiplexed and 8B / 1
There is no concrete example that realizes a transmission system that can perform transmission by performing 0B conversion. In addition, such a plurality of digital video signals are multiplexed so that they can be reproduced, and
There is no document describing a technology related to a transmission system capable of performing B / 10B conversion for transmission.

[0017] In view of the above, the invention described in the claims of the present application provides, for example, the aforementioned Y data series and P
For digital video signal as the digital video signal in the form of a _B / P _R data sequence, with a means that can adjust relatively easily, multiplexes those multiple reproducibly, further subjected to 8B / 10B conversion A data transmission method capable of transmitting data by means of the data transmission method and a data transmission apparatus provided for the implementation thereof.

[0018]

According to a first aspect of the present invention, there is provided a data transmission method for multiplexing a plurality of digital video signals. To obtain word string data, subject the word string data to 8B / 10B conversion processing,
Forming 0-bit word string data, performing transmission rate conversion processing on the 20-bit word string data, and including 20-bit word synchronization data provided with a preset code at predetermined word intervals. An additional word data group is inserted to form composite 20-bit word string data, the composite 20-bit word string data is converted to serial data, and the serial data is transmitted for transmission.

In particular, in the data transmission method according to the invention described in claim 2 of the present application, the additional word data group includes a plurality of 20-bit word data to which a predetermined code is assigned. Are selected as those containing 20 bits word synchronization data.

A data transmission apparatus according to a seventh aspect of the present invention includes a data multiplexing means for multiplexing a plurality of digital video signals to obtain word string data, 20-bit word string data forming means for performing an 8B / 10B conversion process on the word string data obtained from the multiplexing means and forming 20-bit word string data, and 20-bit word string data obtained from the 20-bit word string data forming means , A transmission rate conversion process is performed, and an additional word data group including 20-bit word synchronization data to which a predetermined code is given is inserted at predetermined word intervals, and a composite 20-bit word string data is inserted. Conversion / data insertion means for forming the data and the composite 20 obtained from the speed conversion / data insertion means The Ttowado column data into serial data, and a data sending means for sending in order to transmit the serial data.

In the data transmission method according to any one of the first to sixth aspects of the present invention, a multiplexing process is performed on a plurality of digital video signals. 8B / 10B conversion processing and transmission rate conversion processing are performed on the word string data obtained by performing the conversion, and the data is converted into serial data and transmitted to the composite 20-bit word string data to be transmitted. Means that 20-bit word synchronization data to which a predetermined code is given is included. Such 20-bit word synchronization data is, for example, a plurality of 20-bit words to which a predetermined code is assigned, as in the data transmission method according to the invention described in claim 2 of the present application. A composite 20-bit word sequence is obtained only when data is selected to be continuous with a specific arrangement and an additional word data group is inserted into 20-bit word sequence data obtained by multiplexing a plurality of digital video signals. It appears in the data.

The 20-bit word synchronizing data provided with the predetermined code and included in the composite 20-bit word string data is converted by the receiving side that receives serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of digital video signals from composite 20-bit word string data obtained based on the received serial data. . Also, 2 included in the composite 20-bit word string data
Since the 0-bit word string data is obtained through an 8B / 10B conversion process, good transmission quality is provided. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the composite 20-bit word string data received while obtaining good transmission quality is established. , A state that can be obtained reliably.

[0023] In the data transmission method according to any one of the first to sixth aspects of the present invention, a predetermined code is provided. Conversion of the 20-bit word string data to which the bit-word synchronization data is added into serial data, transmission of the converted serial data, and further, reception of the serial data on the receiving side, and 20-bit word string of the received serial data Conversion to data and the like can be performed, for example, using a transmission circuit device used for transmitting and receiving digital video signals under an HDTV system. Therefore, according to the data transmission method according to have been present invention according to any one of claims 1 to 6 in the claims of the present application, digital take the form of a Y data sequence and P _B / P _R data sequence A digital video signal, such as a video signal, can be multiplexed reproducibly by means that can be prepared relatively easily, and can be transmitted after performing 8B / 10B conversion.

Further, in the data transmission apparatus according to the invention described in claim 7 of the present application, a word obtained by performing multiplexing processing on a plurality of digital video signals by data multiplexing means. 2 for column data
It is formed by performing 8B / 10B conversion processing by the 0-bit word string data forming means and transmission speed conversion processing by the speed conversion / data insertion means, and is converted into serial data by the data transmission means and transmitted for transmission. The composite 20-bit word string data includes 20-bit word synchronization data to which a predetermined code has been inserted, inserted by the speed conversion / data insertion means. Such 20-bit word synchronization data is, for example,
A plurality of 20-bit word data to which a predetermined code is assigned is selected to be continuous with a specific arrangement, and an additional word is added to 20-bit word string data obtained by performing multiplexing processing on a plurality of digital video signals. Only when a data group is inserted, it appears in the composite 20-bit word string data.

The 20-bit word synchronizing data provided with the predetermined code and included in the composite 20-bit word string data is converted by the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of digital video signals from composite 20-bit word string data obtained based on the received serial data. . Also, 2 included in the composite 20-bit word string data
Since the 0-bit word string data is obtained through an 8B / 10B conversion process, good transmission quality is provided. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the composite 20-bit word string data received while obtaining good transmission quality is established. , A state that can be obtained reliably.

According to the data transmission apparatus of the present invention described in claim 7 of the present application, a 20-bit word synchronous data to which a predetermined code is given is added. Conversion of bit word string data to serial data, transmission of converted serial data, and reception of serial data on the receiving side, conversion of received serial data to 20-bit word string data, and the like, for example, can be performed over a transmission circuit devices used in the transmission and reception of digital video signals in the original HDTV system, therefore, as a digital video signal in the form of a Y data sequence and P _B / P _R data sequence With means that can be relatively easily prepared for digital video signals,
Multiple of them are reproducibly multiplexed and 8B / 1
The transmission can be performed after performing the 0B conversion.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a data transmission method according to the present invention described in claims 1, 2, 3, 5 or 6 of the present invention. An example of the data transmission device according to the invention described in claim 7 in the range of FIG.

In the example shown in FIG.
Channel digital video signals DVS1, DVS2,
DVS3 and DVS4 are supplied to the data multiplexing unit 10. These four-channel digital video signals DVS
Each of 1 to DVS4 is Y shown in FIGS.
Multiplexing processing on data sequences and P _B / P _R data sequence is formed is subjected to 10-bit quantization digital signal taking word multiplexed data format embodiment of as shown in FIG. 13, P / S conversion And the bit transmission rate obtained by performing the scrambling process,
For example, serial data of 270 Mbps is bit-synchronized with each other.

In the data multiplexing unit 10, for example, as shown in FIGS.
Bit strings V1 / 0, V1 / transmitted as Mbps
1, V1 / 2, V1 / 3, V1 / 4, V1 / 5,...
.. A digital video signal DVS1 arriving as a bit string V2 / 0, V2 / 1, V2 / 2, V2 / 3, V2 / 4, transmitted at a bit transmission rate of 270 Mbps
Digital video signal DVS2 arriving as V2 / 5,..., Bit strings V3 / 0, V3 / 1, V3 / 2, V3 transmitted at a bit transmission rate of 270 Mbps
.., V3 / 4, V3 / 5,..., And a bit stream V4 / 0, V transmitted at a bit transmission rate of 270 Mbps
4/1, V4 / 2, V4 / 3, V4 / 4, V4 / 5,.
.., For example, by sequentially taking in 1-bit addresses in each of the digital video signals DVS4 and sequentially connecting them to 8 bits, as shown in FIG. 2, 8-bit word data V1 / 0 as shown in FIG. V4 / 1, V
1/2 to V4 / 3, V1 / 4 to V4 / 5, V1 / 6 to V
4/7,..., Or, for example, by successively taking in 8 bits in each of them and connecting them, as shown in FIG.
Bit word data V1 / 0 to V1 / 7, V2 / 0 to V
2/7, V3 / 0 to V3 / 7, V4 / 0 to V4 / 7,.
.. Are formed successively, and 8-bit word string data DU (8) having a word transmission rate of 135 MBps is obtained. Note that the arrow t in FIGS. 2 and 3 indicates the passage of time.

The 8-bit word string data DU (8) having a word transmission rate of 135 MBps formed in the data multiplexing unit 10 is supplied to the composite data forming unit 11. In the composite data forming section 11, the 8-bit word string data DU (8) is supplied to the 8B / 10B conversion / 20-bit word string data forming section 12.

In the 8B / 10B conversion / 20-bit word string data forming section 12, the 8-bit word string data D
U (8) is subjected to an 8B / 10B conversion process in which the 8 bits forming each word in the U (8) are partitioned, and each of the partitioned 8 bits is sequentially converted into 10-bit data. 1 sequentially obtained by the conversion process
The word transmission rate is set to 67.
20-bit word string data DM (2
0) is formed. Then, 20-bit word string data DM (20) having a word transmission rate of 67.5 MBps obtained from the 8B / 10B conversion / 20-bit word string data forming section 12 is supplied to the rate conversion / data insertion section 13.

The speed conversion / data insertion unit 13 includes, in addition to the 20-bit word string data DM (20), the 20-bit word synchronization data to which a predetermined code has been assigned from the word data transmission unit 14. An additional word data group DWT composed of a plurality of 20-bit word data is supplied. In the rate conversion / data insertion unit 13, the word transmission rate is set to 67.5M.
For 20-bit word string data DM (20) with Bps, the word transmission rate is, for example, 67.5 MB.
In addition to performing speed conversion for converting from ps to 74.25 MBps, an additional word data group DWT including 20-bit word synchronization data from the word data transmission unit 14 is inserted at a predetermined word interval.
4-channel digital video signals DVS1 to DVS4
, For example, a word transmission rate of 74.25 MB
composite 20-bit word string data DZ (20) as ps
To form

FIG. 4 shows a specific configuration example of the speed conversion / data insertion unit 13. In the example shown in FIG. 4, the word transmission rate obtained from 8B / 10B conversion / 20-bit word string data forming section 12 is 67.5 MBp.
The 20-bit word string data DM (20) as s is supplied to the switch 15. The switch 15 performs switching every predetermined period, for example, every 1 ms in response to the control signal CSA from the switch control signal forming unit 16, thereby changing the 20-bit word string data DM (20) for 1 ms.
The data is alternately supplied to the memory unit 17 and the memory unit 18 every interval, and the 20-bit word string data DM (20) is distributed and supplied to the memory unit 17 and the memory unit 18.

A memory control signal forming unit 19 is provided in association with the memory unit 17 and the memory unit 18.
The memory control signal forming unit 19 includes, for example, a clock signal CA having a frequency of 270 MHz synchronized with a clock signal in each of the four-channel digital video signals DVS1 to DVS4 and a clock signal CB having a frequency of 74.25 MHz. Supplied. Then, the memory control signal forming section 19 generates a write control signal QW having a frequency of 270 MHz / 4 = 67.5 MHz based on the clock signal CA, and sets a frequency of 74.70 MHz based on the clock signal CB. A read control signal QR having a frequency of 25 MHz is generated, and the write control signal QW and the read control signal QR are supplied to both the memory unit 17 and the memory unit 18.

Thus, in the memory section 17, the 20-bit word string data DM (2
0) is supplied, the word transmission rate of the 20-bit word string data DM (20) is changed to 67.5 M in response to the write control signal QW having a frequency of 67.5 MHz.
It is written in the state of Bps. Also, the memory unit 18
Also, in the period in which the 20-bit word string data DM (20) is supplied through the switch 15, the frequency of the 20-bit word string data DM (20) is 67.5.
In response to the write control signal QW of MHz, the data is written in a state where the word transmission speed is 67.5 MBps. Therefore, 20 in each of the memory unit 17 and the memory unit 18
When the word transmission speed of the bit word string data DM (20) is set to 67.5 MBps, writing to the switch 1 is performed.
5 is alternately performed for 1 ms in accordance with the switching every 1 ms.

The 20-bit word string data DM (20) written into the memory unit 17 for 1 ms is supplied with a read control signal QR having a frequency of 74.25 MHz during the next 1 ms. , Word transmission rate 74.2
20-bit word string data DM '(2
0) from the memory unit 17 and the switch 20
Supplied to The 20-bit word string data DM (20) written in the memory unit 18 for 1 ms
Also, within the next 1 ms, the frequency is set to 74.25M.
In response to the read control signal QR at Hz, 20-bit word string data DM '(20) having a word transmission rate of 74.25 MBps is read from the memory unit 18 and supplied to the switch 20. The switch 20 is also supplied with the additional word data group DWT from the word data transmission unit 14. The additional word data group DWT has a word transmission rate of 74.25 MBps.

In response to the control signal CSB from the switch control signal forming unit 16, the switch 20 reads the additional word data group DWT from the word data transmitting unit 14 with the word transmission speed of 74.25 MBps and the memory unit 18. The 20-bit word string data DM ′ (20) having the word transmission rate of 74.25 MBps and the word transmission rate read from the memory unit 17 are 74.25.
20-bit word string data DM '(20) with MBps
Are sequentially taken out for a predetermined word period. As a result, a word transmission rate of 74.25 is output from the switch 20.
20-bit word string data DM ′ converted to MBps
The compound 20-bit word string data DZ (20) formed by inserting the additional word data group DWT having a word transmission rate of 74.25 MBps at predetermined word intervals at (20) is derived.

Word transmission from word data sending section 14
Additional word data glue with speed of 74.25 MBps
Open DWT is provided with a predetermined code 20
Multiple 20-bit words containing bit word synchronization data
20-bit word synchronization data
The data is, for example, a Y data system as shown in FIG.
10 bits of EAV or SAV included in the column
Word data 3FF (Y), 000 (Y) and 000
(Y) and P as shown in FIG._B/ P _RDay
10 of EAV or SAV included in the data sequence
Word data 3FF (C), 000 (C) and 00
0 (C), which is 3 words formed based on
FF: 3FFh, 000,000: 000h and 00000: 000
h are sequentially arranged. 3FF: 3FF
h is 10-bit word data 3FF (Y) and 3FF
(C) is bit-multiplexed into 20-bit word data.
000h is 10 videos.
Word data 000 (Y) and 000 (C) are bit
Multiplexed into 20-bit word data.
You.

The additional word data group DWT having a word transmission rate of 74.25 MBps from the word data transmitting unit 14 includes three 20-bit word data 3FF: 3FFh, which are 20-bit word synchronous data.
000: 000h and 000000: h, and the other two
And 0-bit word data.

Such an additional word data group DWT
Is, in one specific example, three consecutive 20-bit word data 3 which are 20-bit word synchronization data.
FF: 3FFh, 000,000: 000h and 00000: 000
Prior to h, arbitrary 20-bit word data DX is to be arranged. In the composite 20-bit word string data DZ (20) formed by inserting such an additional word data group DWT, the portion into which the additional word data group DWT is inserted is, for example, as shown in FIG. You. 5. In FIG. 5, DM represents 20-bit word data forming 20-bit word string data DM '(20) read from each of the memory units 17 and 18 shown in FIG. , And the arrow t indicates the passage of time.

The additional word data group DWT
In another example of the specific example, three consecutive 20-bit word data 3FF: 3FFh, 0,000,000: 000h and 000: 0 which are 20-bit word synchronization data.
An arbitrary 20-bit word data DX is arranged before and after 00h. The composite 20-bit word string data DZ (20) formed by inserting such an additional word data group DWT has a portion where the additional word data group DWT is inserted, for example, as shown in FIG. You. Also in FIG. 6, the DM is the 2 read from each of the memory units 17 and 18 shown in FIG.
The 20-bit word data forming the 0-bit word string data DM '(20) is represented by DX.
0-bit word data, and an arrow t
Represents the passage of time.

The composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion section 13 is
The P / S converter 2 sent from the composite data forming unit 11
1 is supplied. In the P / S converter 21, the composite 2
The P / S conversion for converting parallel data into serial data is performed on the 0-bit word string data DZ (20) to obtain serial data based on the composite 20-bit word string data DZ (20). For example, scramble processing is performed on serial data based on composite 20-bit word string data DZ (20) by dividing by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further by dividing by an equation: X + 1. The processed serial data DZS is formed, and the serial data DZS is supplied to the transmission unit 22.

The transmitting section 22 converts the serial data DZS into
For example, in order to transmit through a data transmission line formed using a coaxial cable or an optical fiber, an electric signal suitable for the data transmission line formed using a coaxial cable or an optical fiber is used. The signal is converted into a transmission signal SZ which is an optical signal suitable for the formed data transmission path and transmitted. Thereby, the scrambled serial data DZ
Transmission of S is performed.

As described above, the 8-bit word string data DU (8) obtained by multiplexing the 4-channel digital video signals DVS1 to DVS4 has 8B
20 formed through the process of performing / 10B conversion processing
In the bit word string data DM (20), three consecutive 20-bit word data 3FF: 3FFh, 0,000,000: 000h and 000:
Compound word string data DZ formed by inserting an additional word data group DWT including 000h
(20) is converted into scrambled serial data DZS and transmitted. At this time, the 8-bit word string data DU (8) contains 8B / 10B
In the 20-bit word string data DM (20) formed through the process of performing the conversion process, the sequence of the code: “0” or “1” becomes 6 or more due to the characteristics of the 8B / 10B code. Therefore, the 20-bit word synchronous data 3FF: 3FFh, 000000h and 00
0: 000h does not appear. Therefore, composite 20
In the bit word string data DZ (20), the 20-bit word synchronization data 3FF: 3FFh, 000: 000000h and 00 included in the additional word data group DWT added to the 20-bit word string data DM (20).
Only 0: 000h plays the role of synchronous data. The scrambling process for the serial data based on the composite 20-bit word string data DZ (20) in the P / A converter 21 is not always necessary, and the serial data based on the composite 20-bit word string data DZ (20) is scrambled. Without being processed
It may be supplied to the transmission unit 22. When serial data based on the composite 20-bit word string data DZ (20) is transmitted without being subjected to scramble processing, improvement in transmission characteristics is expected.

FIG. 7 shows an example of the data transmission method according to the invention described in claims 1, 2, 4, 5 or 6 in the claims of the present application. An example of the data transmission device according to the invention described in Item 7 is shown.

In the example shown in FIG.
Channel digital video signals DVP1, DVP2,
DVP3 and DVP4 are supplied to the data multiplexing unit 30. These four channels of digital video signal DVP
Each of 1 to DVP4 is Y shown in FIGS.
Multiplexing processing on data sequences and P _B / P _R data sequence is formed is subjected, a 10-bit quantized digital signal having aspects of the word multiple data format as shown in FIG. 13, the bit rate For example, 2
It is parallel data of 7 MBps, and is word-synchronized with each other.

The data multiplexing unit 30 performs a multiplexing process for multiplexing by repeating, for example, sequentially taking out one word = 10 bits from each of the digital video signals DVP1 to DVP4, thereby obtaining a word transmission rate. Is obtained, for example, at 54 MBps to obtain 20-bit word string data DU (20). Then, the 20-bit word string data DU (20) obtained from the 20-bit word string data forming unit 30 is supplied to the composite data forming unit 31.

In the composite data forming section 31, 20-bit word string data DU (20) having a word transmission rate of 54 MBps is supplied to the 8B / 10B conversion / 20-bit word string data forming section 32.

In the 8B / 10B conversion / 20-bit word string data forming section 32, the 20-bit word string data DU (20) is divided into 8 bits, and
An 8B / 10B conversion process for sequentially converting each of the divided 8 bits into 10-bit data is performed.
Based on the 10-bit data sequentially obtained by the B / 10B conversion processing, 20-bit word string data DM (20) having a word transmission rate of 67.5 MBps is formed. The word transmission rate obtained from the 8B / 10B conversion / 20-bit word string data forming unit 32 is 67.5.
20-bit word string data DM (20) with MBps
Is supplied to the speed conversion / data insertion unit 33.

The speed conversion / data insertion section 33 includes, in addition to the 20-bit word string data DM (20), 20-bit word synchronization data to which a predetermined code has been assigned from the word data transmission section 34. An additional word data group DWT composed of a plurality of 20-bit word data is supplied. Then, in the rate conversion / data insertion section 33, the word transmission rate is set to 67.5M.
For 20-bit word string data DM (20) with Bps, the word transmission rate is, for example, 67.5 MB.
In addition to performing speed conversion for converting from ps to 74.25 MBps, an additional word data group DWT including 20-bit word synchronization data from the word data transmission unit 34 is inserted at a predetermined word interval, whereby
4-channel digital video signals DVP1 to DVP4
, For example, a word transmission rate of 74.25 MB
composite 20-bit word string data DZ (20) as ps
To form As described above, the additional word data group DWT supplied from the word data transmission unit 34 to the speed conversion / data insertion unit 33 has a word transmission rate of 74.2.
5 MBps.

A specific configuration example of the speed conversion / data insertion unit 33 is the same as the specific configuration example of the speed conversion / data insertion unit 13 shown in FIG. The additional word data group DWT including the 20-bit word synchronization data transmitted from the word data transmission unit 34 also corresponds to FIG.
20 sent from the word data sending unit 14 shown in FIG.
It is the same as the additional word data group DWT including the bit word synchronization data.
Three consecutive 20 bits that are 20-bit word synchronization data
Bit word data 3FF: 3FFh, 000: 000
h and 000: 000h, arbitrary 20-bit word data DX is arranged before the h and 000: 000h. Another specific example is that three consecutive 20-bit words which are 20-bit word synchronization data are used. Data 3FF: 3FFh,
Arbitrary 20-bit word data DX is arranged before and after 000: 000h and 000000h.

Then, in the speed conversion / data insertion unit 33, the same operation as in the speed conversion / data insertion unit 13 shown in FIG. 1 is performed, whereby the portion where the additional word data group DWT is inserted becomes For example, as shown in FIG. 5 or FIG.
Compound 20-bit word string data D at 25 MBps
Z (20) is obtained.

The composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion section 33 is
The P / S converter 3 sent from the composite data forming unit 31
5 is supplied. In the P / S converter 35, the composite 2
The P / S conversion for converting parallel data into serial data is performed on the 0-bit word string data DZ (20) to obtain serial data based on the composite 20-bit word string data DZ (20). For example, scramble processing is performed on serial data based on composite 20-bit word string data DZ (20) by dividing by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further by dividing by an equation: X + 1. The processed serial data DZS is formed, and the serial data DZS is supplied to the transmitting unit 36.

The transmitting section 36 converts the serial data DZS into
For example, in order to transmit through a data transmission line formed using a coaxial cable or an optical fiber, an electric signal suitable for the data transmission line formed using a coaxial cable or an optical fiber is used. The signal is converted into a transmission signal SZ which is an optical signal suitable for the formed data transmission path and transmitted. Thereby, the scrambled serial data DZ
Transmission of S is performed.

As described above, the 20-bit word string data DU (20) obtained by multiplexing the 4-channel digital video signals DVP1 to DVP4 is
The 20-bit word string data DM (20) formed through the process of performing the 8B / 10B conversion processing is added to three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 20-bit word synchronous data. 00
Additional word data group DWT including 0: 000h
Is converted into composite scrambled serial data DZS and transmitted. At this time, 8B / 1 is added to the 20-bit word string data DU (20).
In the 20-bit word string data DM (20) formed through the process of performing the 0B conversion process, 8B / 10
According to the characteristics of the B code, since the sequence of the code: "0" or "1" does not become 6 or more, the 20-bit word synchronous data 3FF: 3FFh, 000: 000h and 0
00: 000h does not appear. Therefore, composite 2
In the 0-bit word string data DZ (20), 20
20-bit word synchronous data 3FF: 3FFh, 000000h and 0 included in the additional word data group DWT added to the bit word string data DM (20)
Only 00: 000h plays the role of synchronous data. Further, the scramble processing for the serial data based on the composite 20-bit word string data DZ (20) in the P / A conversion unit 35 is not always necessary.
Serial data based on the composite 20-bit word string data DZ (20) may be supplied to the transmission unit 36 without being subjected to scramble processing. When serial data based on the composite 20-bit word string data DZ (20) is transmitted without being subjected to scramble processing, improvement in transmission characteristics is expected.

FIG. 8 shows transmission in the example of the data transmission apparatus shown in FIG. 1 according to the example of the data transmission method according to the invention described in claims 1, 2, 3, 5 or 6 in the claims of the present application. The scrambled serial data DZS obtained by converting the composite 20-bit word string data DZ (20) sent from the unit 22
1 shows an example of a data receiving apparatus that receives a transmission signal SZ based on the data.

In the example of the data receiving apparatus shown in FIG. 8, for example, an electric signal suitable for a data transmission line formed by using a coaxial cable or an optical fiber formed by using an optical fiber is used. And a receiving unit 40 for receiving a transmission signal SZ which is an optical signal suitable for the data transmission path. When receiving the transmission signal SZ, the receiver 40 reproduces the scrambled serial data DZS based on the received transmission signal SZ and supplies it to the S / P conversion / synchronization data detector 41. .

In the S / P conversion / synchronous data detecting section 41, the scrambled serial data DZ
S is multiplied by the expression: X + 1, and a ninth-order primitive polynomial:
The descrambling process is performed on the scrambled serial data DZS by multiplying by X ⁹ + X ⁴ +1 to obtain the scrambled serial data. Further, in the S / P conversion / synchronous data detecting unit 41, the scrambled serial data D
The serial data obtained by subjecting the ZS to the descrambling process is subjected to S / P conversion, and A or
For example, as shown in A of FIG.
Composite 20 which is parallel data with 4.25 MBps
The bit word string data DZ (20) is formed. Then, the composite 20-bit word string data DZ (20) obtained from the S / P conversion / synchronization data detection unit 41 is supplied to the speed conversion / synchronization data separation unit 42.

The S / P converter / synchronous data detector 41
, The composite 20-bit word string data DZ (2
0) in the additional word data group DWT.
Three consecutive 20-bit word data 3FF: 3FFh, 000000h which are 0-bit word synchronous data
And 000: 000h, and sends out a synchronous data detection output signal SWS. This synchronous data detection output signal S
WS is, for example, the composite 20-bit word string data DZ detected by the S / P conversion / synchronization data detection unit 41.
Three consecutive 20-bit word data 3FF: 3FF in the additional word data group DWT in (20)
Corresponding to the last one of h000: 000h and 000: 000h, it is obtained as shown in FIG. 9B or FIG. 10B. Note that the arrow t in FIGS. 9 and 10 indicates the passage of time.

As described above, the synchronous data detection output signal SWS obtained from the S / P conversion / synchronous data detector 41
Is supplied to the control signal forming unit 43. Then, in the control signal forming section 43, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The speed conversion / synchronization data separation unit 42 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection unit 41 receives the synchronization control signal from the control signal forming unit 43. CW is also provided. And
In the speed conversion / synchronization data separation unit 42, under the control of the word synchronization by the synchronization control signal CW, a 20-bit word having a word transmission rate of 74.25 Mbps is obtained from the composite 20-bit word string data DZ (20). Column data DM (20) and additional word data group DW
T is separated and taken out, and the taken-out 20-bit word string data DM (20) is subjected to speed conversion from a word transmission speed of 74.25 MBps to a word transmission speed of 67.5 MBps. Is applied.

The 20-bit word string data DM (20) with a word transmission rate of 67.5 MBps obtained from the rate conversion / synchronization data separation section 42 is supplied to a 10B / 8B conversion / 8-bit word string data formation section 44. Is done. 1
The synchronization control signal CW from the control signal forming unit 43 is also supplied to the 0B / 8B conversion / 8-bit word string data forming unit 44.

In the 10B / 8B conversion / 8-bit word string data forming section 44, the 10-bit address in the 20-bit word string data DM (20) is divided, and each of the divided 10 bits is divided. A 10B / 8B conversion process for sequentially converting the data to 8-bit data is performed, and the word transmission speed is set to 135 MBp based on the 8-bit data sequentially obtained by the 10B / 8B conversion process.
The 8-bit word string data DU (8) is formed as s.

The word transmission rate obtained from the 10B / 8B conversion / 8-bit word string data forming section 44 is 135 MB.
The 8-bit word string data DU (8) of ps is supplied to the data separation unit 45. In the data separation unit 45, one-bit or eight-bit addresses are sequentially extracted from the 8-bit word string data DU (8), divided into four groups, and the bits of each of the divided groups. The state where each of the data is individually derived is continued, and based on the 8-bit word string data DU (8), four-channel digital video signals DVS1 and DVS2 each being serial data having a bit transmission rate of 270 Mbps. , DVS3 and DVS4 are formed separately from each other. Thereby, the data separation unit 45
From the reproduced 4-channel digital video signal D
VS1 to DVS4 are derived.

In this way, the four-channel digital video signals DVS1 to DVS4, each of which is serial data having a bit transmission rate of 270 Mbps, are reproduced.

FIG. 11 shows transmission in the example of the data transmission apparatus shown in FIG. 7 according to the example of the data transmission method according to the invention described in claims 1, 2, 4, 5 or 6 in the claims of the present application. The composite 20 sent from the unit 36
Scrambled serial data DZS obtained by converting bit word string data DZ (20).
1 shows an example of a data receiving apparatus that receives a transmission signal SZ based on the data.

In the example of the data receiving apparatus shown in FIG. 11, for example, an electric signal suitable for a data transmission line formed by using a coaxial cable or an optical fiber formed by using an optical fiber is used. A receiving unit 50 is provided for receiving a transmission signal SZ which is an optical signal suitable for the data transmission path. The receiving unit 50 transmits the transmission signal SZ
Is received, the serial data DZS subjected to the scramble processing based on the received transmission signal SZ is reproduced, and the reproduced data is supplied to the S / P conversion / synchronous data detection unit 51.

In the S / P conversion / synchronous data detecting section 51, the scrambled serial data DZ
S is multiplied by the expression: X + 1, and a ninth-order primitive polynomial:
The descrambling process is performed on the scrambled serial data DZS by multiplying by X ⁹ + X ⁴ +1 to obtain the scrambled serial data. Further, in the S / P conversion / synchronous data detection unit 51, the serial data
The serial data obtained by subjecting the ZS to the descrambling process is subjected to S / P conversion, and A or
For example, as shown in A of FIG.
Composite 20 which is parallel data with 4.25 MBps
The bit word string data DZ (20) is formed. Then, the composite 20-bit word string data DZ (20) obtained from the S / P conversion / synchronization data detection unit 51 is supplied to the speed conversion / synchronization data separation unit 52.

The S / P converter / synchronous data detector 51
, The composite 20-bit word string data DZ (2
0) in the additional word data group DWT.
Three consecutive 20-bit word data 3FF: 3FFh, 000000h which are 0-bit word synchronous data
And 000: 000h, and sends out a synchronous data detection output signal SWS. This synchronous data detection output signal S
WS is, for example, the composite 20-bit word string data DZ detected by the S / P conversion / synchronization data detection unit 51.
Three consecutive 20-bit word data 3FF: 3FF in the additional word data group DWT in (20)
Corresponding to the last one of h000: 000h and 000: 000h, it is obtained as shown in FIG. 9B or FIG. 10B.

As described above, the synchronous data detection output signal SWS obtained from the S / P conversion / synchronous data detection section 51
Is supplied to the control signal forming unit 53. Then, in the control signal forming section 53, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The speed conversion / synchronization data separation section 52 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection section 51 is provided with a synchronization control signal from a control signal formation section 53. CW is also provided. And
In the speed conversion / synchronization data separation unit 52, under the control of the word synchronization by the synchronization control signal CW, a 20-bit word having a word transmission speed of 74.25 Mbps is obtained from the composite 20-bit word string data DZ (20). Column data DM (20) and additional word data group DW
T is separated and taken out, and the taken-out 20-bit word string data DM (20) is subjected to speed conversion from a word transmission speed of 74.25 MBps to a word transmission speed of 67.5 MBps. Is applied.

The 20-bit word string data DM (20) having a word transmission rate of 67.5 MBps obtained from the rate conversion / synchronization data separation section 42 is supplied to a 10B / 8B conversion / 20-bit word string data forming section 54. Is done.
10B / 8B conversion / 20-bit word string data forming unit 5
4 is also supplied with a synchronization control signal CW from the control signal forming unit 53.

In the 10B / 8B conversion / 20-bit word string data forming section 54, the 10-bit addresses in the 20-bit word string data DM (20) are divided, and each of the divided 10 bits is divided. A 10B / 8B conversion process for sequentially converting the data to 8-bit data is performed, and the word transmission rate is set to 54 MBp based on the 8-bit data sequentially obtained by the 10B / 8B conversion process.
The 20-bit word string data DU (20) is formed as s.

The word transmission speed obtained from the 10B / 8B conversion / 20-bit word string data forming unit 54 is 54 MB.
The 20-bit word string data DU (20) with ps is
The data is supplied to the data separation unit 55. In the data separation unit 55, from the 20-bit word string data DU (20),
10 bits are sequentially taken out and divided into four groups, and the state where each of the divided 10-bit data is individually derived as word data continues, and the 20-bit word string data DU (2
0), four channels of digital video signals DVP1, DVP2, DVP3 and DVP4, each of which is parallel data with a word transmission rate of 27 MBps.
Are formed separately from each other. Thereby, the reproduced four-channel digital video signals DVP1 to DVP4 are derived from the data separation unit 55.

In this way, the four-channel digital video signals DVP1 to DVP4, each of which is parallel data having a bit transmission rate of 27 MBps, are reproduced.

In the example of the data transmission method implemented using the example of the data transmission apparatus shown in FIG. 1 or FIG. 7, four channels of digital video signals are subjected to multiplexing processing. . However, the data transmission method according to any one of claims 1 to 6 in the claims of the present application, or the data transmission method according to the invention described in claim 7 in the claims of the present application Under the data transmission device, the digital video signal to be subjected to the multiplexing process need not be limited to four channels, but may be any plural channels.

Further, in the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 1, the digital video signal which is multiplexed and transmitted as four-channel serial data Transmission speed,
For example, it is set to 270 Mbps.
The bit transmission rate of each of the digital video signals converted into serial data of four channels to be multiplexed is 270
Mbps. Further, in the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 7, the digital video signal which is multiplexed and transmitted as four-channel parallel data has the respective word transmission rates. For example, the speed is set to 27 MBps, but the word transmission speed of each digital video signal converted into multiplexed 4-channel parallel data is not limited to 27 MBps.

[0078]

As is apparent from the above description, in the data transmission method according to any one of the first to sixth aspects of the present invention, a plurality of digital video A compound that is formed by subjecting a word string data obtained by performing a multiplexing process to a signal to an 8B / 10B conversion process and a transmission speed conversion process, converting the signal to serial data, and transmitting the serial data. The 20-bit word string data includes 20-bit word synchronization data to which a predetermined code is given. Such a 20-bit word synchronization data is, for example, a second embodiment of the present invention.
As in the data transmission method according to the invention described in
A plurality of 20-bit word data to which a predetermined code is assigned is selected to be continuous with a specific arrangement, and an additional word is added to 20-bit word string data obtained by performing multiplexing processing on a plurality of digital video signals. Only when a data group is inserted, it appears in the composite 20-bit word string data.

The 20-bit word synchronizing data provided with the predetermined code and included in the composite 20-bit word string data is converted on the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of digital video signals from composite 20-bit word string data obtained based on the received serial data. . Also, 2 included in the composite 20-bit word string data
Since the 0-bit word string data is obtained through an 8B / 10B conversion process, good transmission quality is provided. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the composite 20-bit word string data received while obtaining good transmission quality is established. , A state that can be obtained reliably.

According to the data transmission method according to the invention described in any one of claims 1 to 6 in the claims of the present application, a predetermined code given to 20 bits Conversion of the 20-bit word string data to which the word synchronization data has been added into serial data, transmission of the converted serial data, and reception of the serial data on the receiving side, and 20-bit word string data of the received serial data Can be performed using, for example, a transmission circuit device used for transmission and reception of a digital video signal under an HDTV system.
For digital video signal as the digital video signal in the form of a _B / P _R data sequence, with a means that can adjust relatively easily, multiplexes those multiple reproducibly, further subjected to 8B / 10B conversion Can be transmitted.

Further, in the data transmission apparatus according to the invention described in claim 7 of the present application, a word obtained by multiplexing a plurality of digital video signals by data multiplexing means is obtained. 2 for column data
It is formed by performing 8B / 10B conversion processing by the 0-bit word string data forming means and transmission speed conversion processing by the speed conversion / data insertion means, and is converted into serial data by the data transmission means and transmitted for transmission. The composite 20-bit word string data includes 20-bit word synchronization data to which a predetermined code has been inserted, inserted by the speed conversion / data insertion means. Such 20-bit word synchronization data is, for example,
A plurality of 20-bit word data to which a predetermined code is assigned is selected to be continuous with a specific arrangement, and an additional word is added to 20-bit word string data obtained by performing multiplexing processing on a plurality of digital video signals. Only when a data group is inserted, it appears in the composite 20-bit word string data.

The 20-bit word synchronizing data provided with the predetermined code and included in the composite 20-bit word string data is converted on the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of digital video signals from composite 20-bit word string data obtained based on the received serial data. . Also, 2 included in the composite 20-bit word string data
Since the 0-bit word string data is obtained through an 8B / 10B conversion process, good transmission quality is provided. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the composite 20-bit word string data received while obtaining good transmission quality is established. , A state that can be obtained reliably.

According to the data transmission apparatus according to the seventh aspect of the present invention, a 20-bit word synchronization data to which a predetermined code is given is added. Conversion of bit word string data to serial data, transmission of converted serial data, and reception of serial data on the receiving side, conversion of received serial data to 20-bit word string data, and the like, for example, can be performed over a transmission circuit devices used in the transmission and reception of digital video signals in the original HDTV system, therefore, as a digital video signal in the form of a Y data sequence and P _B / P _R data sequence With means that can be relatively easily prepared for digital video signals,
Multiple of them are reproducibly multiplexed and 8B / 1
The transmission can be performed after performing the 0B conversion.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A block configuration showing an example of the data transmission apparatus according to the invention described in claim 7 in the claims of the present application, in which the example of the data transmission method according to the invention described in 2, 3, 5, or 6 is implemented. FIG.

[Fig. 2] Claims 1 and 2 in the claims of the present application.
7 is a time chart for explaining an example of a data transmission method according to the invention described in 2, 3, 5, or 6.

[Fig. 3] Claims 1 and 2 in the claims of the present application.
7 is a time chart for explaining an example of a data transmission method according to the invention described in 2, 3, 5, or 6.

FIG. 4 is a block diagram showing a specific configuration example of a rate conversion / synchronization data insertion unit in the example of the data transmission device shown in FIG. 1;

[Fig. 5] Claims 1 and 2 in the claims of the present application.
7 is a time chart for explaining an example of a data transmission method according to the invention described in 2, 3, 5, or 6.

[Fig. 6] Claim 1, Claim 1 in the claims of the present application.
7 is a time chart for explaining an example of a data transmission method according to the invention described in 2, 3, 5, or 6.

[Fig. 7] Claims 1 and 2 in the claims of the present application.
A block configuration showing an example of the data transmission device according to the invention described in claim 7 in the claims of the present application, in which the example of the data transmission method according to the invention described in 2, 4, 5, or 6 is implemented. FIG.

FIG. 8: Claim 1 in the claims of the present application
FIG. 2 is a block diagram illustrating an example of a data receiving apparatus that receives a transmission signal transmitted from the example of the data transmission apparatus illustrated in FIG. 1 according to the example of the data transmission method according to the invention described in 2, 3, 5, or 6; It is.

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

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

FIG. 11 is a view showing a first embodiment of the present invention;
7 is a block diagram illustrating an example of a data receiving apparatus that receives a transmission signal transmitted from the example of the data transmission apparatus illustrated in FIG. 7 according to the example of the data transmission method according to the invention described in 2, 4, 5, or 6. It is.

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

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

[Explanation of symbols]

10, 30 ... data multiplexing section, 11, 31 ... composite data forming section, 12, 32 ... 8B / 10B conversion, 20-bit word string data forming section, 13, 33 ...
· Speed conversion · Data insertion unit, 14, 34 ··· Word data transmission unit, 15, 20 ··· Switch, 16
Switch control signal forming section, 17, 18: memory section, 19: memory control signal forming section, 21, 35
... P / S converter, 22, 36 ... Sender, 4
0, 50: receiving unit, 41, 51: S / P conversion / synchronous data detecting unit, 42, 52: speed conversion / synchronous data separating unit, 43, 53: control signal forming unit,
44 ... 10B / 8B conversion, 8-bit word string data forming unit, 45, 55 ... data separating unit, 54 ...
-10B / 8B conversion-20-bit word string data forming unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C059 RA01 RB10 RC02 RC24 SS06 UA24 5C063 AA11 AB03 AB07 AB09 DA07 DA13 5K028 EE03 KK01 MM17 RR03 SS06 SS07 5K029 EE18 GG01 GG03

Claims (7)

[Claims] A multiplexing process is performed on a plurality of digital video signals to obtain word string data, and the word string data is subjected to an 8-bit / 10-bit conversion process to form 20-bit word string data. For word string data,
A transmission rate conversion process is performed, and at a predetermined word interval, an additional word data group including 20-bit word synchronization data to which a preset code is given is inserted to form composite 20-bit word string data. A data transmission method for converting the composite 20-bit word string data into serial data and transmitting the serial data for transmission. 2. An additional word data group is selected so as to include, as a 20-bit word synchronization data, a portion in which a plurality of 20-bit word data to which a predetermined code is assigned is connected in a specific arrangement. The data transmission method according to claim 1, wherein: 3. A plurality of digital video signals, each having a
3. The data transmission method according to claim 1, wherein the bit-quantized digital signals are obtained by being converted into serial data and have a bit synchronization relationship with each other. 4. A digital video signal comprising a plurality of digital video signals,
3. The data transmission method according to claim 1, wherein the parallel data is a bit-quantized digital signal and has a word synchronous relationship with each other. 5. A plurality of 20-bit word data to which a predetermined code is assigned based on timing reference data included in each of a plurality of digital video signals, wherein the additional word data group has a specific arrangement. 5. The data transmission method according to claim 3, wherein the continuous part is selected to include 20-bit word synchronization data. 6. A scramble process is performed on serial data obtained by converting composite 20-bit word string data,
6. The data transmission method according to claim 1, wherein the scrambled serial data is transmitted to be transmitted. 7. A data multiplexing means for performing multiplexing processing on a plurality of digital video signals to obtain word string data, and performing 8 bit / 10 bit conversion processing on word string data obtained from said data multiplexing means. 20-bit word string data forming means for forming bit word string data; and 20 obtained from the 20-bit word string data forming means.
The bit word string data is subjected to transmission rate conversion processing, and at a predetermined word interval, an additional word data group including 20-bit word synchronization data to which a preset code is given is inserted, and Speed conversion / data insertion means for forming bit word string data; data transmission for converting composite 20-bit word string data obtained from the speed conversion / data insertion means into serial data and transmitting the serial data for transmission Means for transmitting data.