JP2000350171A - Data transmission method and data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a plurality of digital video signals that is multiplexed in a reproducible way with a comparatively easy means by applying transmission rate conversion processing to 20-bit word stream data formed through multiplex processing, inserting an attached word data group to form composite 20-bit word stream data, converting the resulting data into serial data and transmitting the serial data. SOLUTION: Digital video signals DVS1-DVS4 among digital video signals DVS1-DVS5 of 5 channels are directly fed to a 20-bit word stream data generating section 10. Furthermore, a prescribed time difference with respect to the respective signals DVS1-DVS4 is given to the signal DVS5 by a time difference imparting section 11 to obtain a digital video signal DVS5', and it is fed to the 20-bit word stream data generating section 10. The signals DVS1-DVS5 are obtained by applying multiplexing processing and serial data conversion to a data series and a PB/PR data series and received with horizontal blanking period parts of the signals arranged equally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application performs multiplexing processing on a plurality of digital video signals to obtain 20-bit word string data. Data transmission method for forming composite 20-bit word string data by inserting an additional word data group including word synchronization data, and transmitting the composite 20-bit word string data for transmission, and data transmission apparatus provided for carrying out the method About.

[0002]

2. Description of the Related Art In the field of transmission of digital data containing information data representing various kinds of signal information such as image information, the digital data is converted into serial data, an electric signal based on the serial data is obtained, and the signal is coaxial. A system for transmitting data through a transmission line formed using a cable or twisted pair line,
Alternatively, digital data is converted into serial data, and the serial data is converted into an optical signal, and the optical
A system for transmitting data through a transmission line formed using fibers has been put to practical use.

On the other hand, in the field of video signals, digitization has been attempted from the viewpoint of realizing diversification of transmitted information and high 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, for example, a data format as shown in FIG.

[0004] The data format of the digital video signal shown in FIG. 10 includes a luminance signal data sequence (Y data sequence) representing a luminance signal component in the video signal as shown in FIG. in the as shown, comprises from the color difference signal data sequence representing the color difference signal components (P _B / P _R data sequence) in the video signal, the word data forming the respective Y data sequence and P _B / P _R data sequence Each has a 10-bit configuration. That is, each of the Y data sequence and P _B / P _R data sequence is a 10-bit quantized digital signal. FIG. 10A shows a horizontal blanking period portion in each horizontal period portion of the Y data sequence and a part of the video data period portion before and after the horizontal blanking period portion, and FIG. some of the horizontal blanking period section and the video data period portions before and after thereof in each horizontal period portion in P _B / P _R data sequence is shown.

In the Y data series, each video data period
Immediately before the intervening part, four words each consisting of 10 bits
C (3FF (Y), 000 (Y), 000 (Y), XY
Z (Y); 3FF and 000 are in hexadecimal notation,
(Y) indicates that it is a word in the Y data series
You. ), The timing reference code data (SAV:
Start of Active Video)
Immediately after the data period part, each is made up of 10 bits.
4 words (3FF (Y), 000 (Y), 000)
(Y), XYZ (Y))
Data (EAV: Endof Active Video) is provided.
Similarly, P_B/ P_REach video, even in the data series
Immediately before the data period portion, each has a 10-bit configuration.
4 words (3FF (C), 000 (C), 000)
(C), XYZ (C); 3FF and 000 are displayed in hexadecimal
And (C) is P_B/ P_RA word in the data series
To express. ) Will be distributed
Immediately after each video data period part, each has 10 bits
4 words (3FF (C), 000 (C),
000 (C), XYZ (C))
You. Of course, each of EAV and SAV in Y data series
Is the portion of each horizontal blanking period in the Y data series
And P_B/ P_REAV in the data series and
Each of SAV is P_B/ P _REach horizontal in the data series
It is allocated to the blanking period part.

Note that 000 to 003 and 3 in hexadecimal notation
The codes represented as FC to 3FF are prohibited codes that are not used as video data.

[0007] In such Y data sequence and P _B / P _R data sequence is transmitted, Y data sequence and P _B /
The P _R data sequence, word multiplexing process at Moto horizontal blanking period portions each of EAV and SAV are disposed has been made to the synchronization is performed, the word multiple data series as shown in FIG. 11, 10-bit Formed as a 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, subjected to, for example, scramble processing and transmitted in the form of 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 equation: X + 1, and further multiplied by a primitive polynomial: X ⁹ + X ⁴ +1 to convert the original serial data. Reproduce.

[0011]

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 If digital video signals can be multiplexed and transmitted in a reproducible manner,
Efficient use of the digital video signal is achieved, and the range of use of the digital video signal is 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 point of view, there is a need for a measure capable of reproducing and multiplexing and transmitting a plurality of digital video signals by means that can be prepared relatively easily.

However, in the prior art, the aforementioned Y
For digital video signal as the digital video signal in the form of data sequences and P _B / P _R data sequence,
There is no concrete example that realizes a transmission system capable of transmitting a plurality of these in a reproducible manner.
Further, there is no document or the like that describes a technique relating to a transmission system that can multiplex such a plurality of digital video signals in a reproducible manner and transmit the multiplexed signals.

[0013] 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 data.
_A data transmission method capable of reproducing and multiplexing a plurality of digital video signals such as digital video signals in the form of a _B / P _R data series in a reproducible manner with means capable of relatively easily preparing them. And a data transmission device provided for the implementation.

[0014]

According to a first aspect of the present invention, there is provided a data transmission method comprising the steps of: transmitting at least one of a plurality of digital video signals; Other than with the horizontal blanking period portion aligned,
A multiplexing process is performed on a plurality of digital video signals, with at least one being in a state where a time difference has occurred with respect to the other so that the video data period corresponds to the horizontal blanking period of the other. To form a 20-bit word string data. The 20-bit word string data is subjected to transmission rate conversion processing, and is provided with a predetermined code at predetermined word intervals.
Inserting an additional word data group containing bit word synchronization data to form composite 20-bit word string data, converting the composite 20-bit word string data to serial data, and transmitting the serial data for transmission It is said.

[0015] 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.

According to a seventh aspect of the present invention, there is provided a data transmission apparatus for transmitting a signal other than at least one of a plurality of digital video signals in a horizontal blanking period portion. Are aligned, and at least one is set to be in a state where a time difference is generated with respect to the other to make the video data period correspond to the horizontal blanking period of the other. A 20-bit word string data forming means for multiplexing the digital video signal to form 20-bit word string data; and performing a transmission rate conversion process on the 20-bit word string data obtained from the 20-bit word string data forming means. At the same time, at a predetermined word interval, a predetermined code including 20-bit word synchronization data is included. And a composite data forming means for forming composite 20-bit word string data by inserting the additional word data group, and converting the composite 20-bit word string data obtained from the composite data forming means into serial data, and converting the serial data. And data transmission means for transmitting the data for transmission.

In the data transmission method according to any one of the first to sixth aspects of the present invention as described above, at least one of the methods except for at least one is horizontal. A plurality of blanking period portions aligned with each other and at least one of which has a time difference with respect to the other in order to make the video data period portion correspond to the horizontal blanking period portion with respect to the other one; The composite 20-bit word string data which is formed based on the digital video signal and transmitted to be converted into serial data and transmitted includes the 20-bit word synchronization data provided with a predetermined code. Will be. Such a 20-bit word synchronous data is, for example, a plurality of 2 bits to which a predetermined code is allocated as in the data transmission method according to the invention described in claim 2 of the present application.
Only when the 0-bit word data is selected to be continuous with a specific arrangement and the additional word data group is inserted into the 20-bit word string data obtained by multiplexing a plurality of digital video signals, the composite 20 It appears in the 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 transmitted to the receiving side receiving the serial data based on the composite 20-bit word string data including the same. The word synchronization data required for the process of reproducing a plurality of digital video signals from the composite 20-bit word string data obtained based on the received serial data. You. Therefore, on the receiving side, the received composite 20
The data synchronization state required for the reproduction processing of a plurality of digital video signals based on the bit word string data is as follows:
A state where it can be reliably obtained is secured.

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 With respect to a digital video signal such as a video signal, a plurality of such digital video signals can be reproducibly multiplexed and transmitted by means that can be prepared relatively easily.

Further, in the data transmission apparatus according to the invention described in claim 7 of the present application, the composite 20 bits transmitted to be transmitted after being converted into serial data by the data transmitting means are transmitted. The word string data includes 20-bit word synchronization data to which a predetermined code is given.
The 0-bit word synchronization data is obtained by, for example, selecting a plurality of 20-bit word data to which a predetermined code has been assigned to be continuous with a specific arrangement, and performing a multiplexing process on a plurality of digital video signals. 20
Only when the additional word data group is inserted into the bit word string data, 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 transmitted to the receiving side which receives the serial data based on the composite 20-bit word string data including the data. The word synchronization data required for the process of reproducing a plurality of digital video signals from the composite 20-bit word string data obtained based on the received serial data. ,
Therefore, on the receiving side, a state is ensured in which the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the received composite 20-bit word string data is reliably obtained. .

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,
A plurality of them can be reproduced and multiplexed and transmitted.

[0023]

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, DVS4 and DVS5 are set such that the digital video signals DVS1 to DVS4 among them are directly supplied to the 20-bit word string data forming unit 10, and the digital video signals DVS5 among them. Is converted into a digital video signal DVS5 'in the time difference providing unit 11, and is supplied to the 20-bit word string data forming unit 10. The time difference providing unit 11 causes the digital video signal DVS5 to have a predetermined time difference with respect to each of the digital video signals DVS1 to DVS4.
Is a digital video signal DVS5 ′.

[0025] each of the digital video signal DVS1~DVS5 of these 5 channels s is multiplexing process is formed is subjected to a Y data sequence and P _B / P _R data sequence shown in A and B in FIG. 10, As shown in FIG. 11, a 10-bit quantized digital signal in the form of a word multiplexed data format is converted to serial data by a conversion to serial data. Therefore, it is assumed that bit synchronization has been achieved with each other. The digital video signals DVS1 to DVS5 arrive with their horizontal blanking periods being aligned.

The digital video signals DVS1-DVS1
VS4 is supplied to the 20-bit word string data forming unit 10 with the horizontal blanking period portions aligned, but the digital video signal DVS5 is converted by the time difference providing unit 11 into digital video signals DVS1 to DVS1.
In order to make the video data period part correspond to the horizontal blanking period part of each of the VS4, the 20-bit word string data forming unit 10 generates a digital video signal DVS5 ′ having a time difference with respect to each of the digital video signals DVS1 to DVS4. Supplied. At this time, the digital video signal DVS5 '
Is set to, for example, 20.5H, where H is a time corresponding to one horizontal period, with respect to each of the digital video signals DVS1 to DVS4.

In the 20-bit word string data forming unit 10, the digital video signals DVS1 to DVS4 are in a state where the horizontal blanking period portions are aligned, and the digital video signal DVS5 'is converted to the digital video signals DVS1 to DVS4. In order to make the video data period part correspond to the horizontal blanking period part for each of the digital video signals DVS1 to DVS4, the digital video signals DVS1 to DVS4 have a time difference of 20.5H, for example. The 5-channel digital video signals DVS1 to DVS4 and DVS5 'are subjected to multiplexing processing for multiplexing by repeatedly taking out, for example, 10 bits from each of them, thereby reducing the word transmission rate. , 67.5 MBps, 20-bit word string data D Obtain (20). The 20-bit word string data DM (20) obtained from the 20-bit word string data forming unit 10 is
Supplied to

In the composite data forming unit 12, the 20-bit word string data DM (20) is supplied to the speed conversion / data insertion unit 13. In addition, the speed conversion / data insertion unit 13 receives, from the word data transmission unit 14, additional word data composed of a plurality of 20-bit word data including 20-bit word synchronization data to which a predetermined code has been assigned. A group DWT is provided.

Then, the rate conversion / data insertion unit 13 sets the word transmission rate to 67.5 MBps.
For the bit word string data DM (20), the word transmission rate is, for example, from 67.5 MBps to 74.2.
A speed conversion for converting the data to 5 MBps is performed, and at a predetermined word interval, the speed conversion from the word data transmitting unit 14 is performed.
An additional word data group DWT including 0-bit word synchronization data is inserted, so that the word transmission rate based on the 5-channel digital video signals DVS1 to DVS4 and DVS5 ′ can be set to, for example, 74.25 MBp.
The composite 20-bit word string data DZ (20) is formed as s.

FIG. 2 shows a specific configuration example of the speed conversion / data insertion unit 13. In the example shown in FIG. 2, five channels of digital video signals DVS1 to DVSD are output.
20-bit word string data DM (20) based on VS4 and DVS5 ′ is supplied to the switch 15. The switch 15 receives the control signal C from the switch control signal forming unit 16.
In accordance with the SA, switching is performed every predetermined period, for example, every 1 ms.
M (20) is stored in the memory unit 17 and the memory unit 1 every 1 ms.
8 and alternately supplied to form a 20-bit word string data DM.
(20) is distributed 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, digital video signals DVS1 to DVS4 and DVS of five channels.
The frequency synchronized with the clock signal in each of 5 ′ is 2
A clock signal CA having a frequency of 70 MHz and a frequency of 74.
A clock signal CB having a frequency of 25 MHz is supplied. Then, the memory control signal forming unit 19 outputs the clock signal CA
270 MHz / 4 = 67.5 MH
z, a write control signal QW having a frequency of 74.25 MHz is generated based on a clock signal CB, and the write control signal QW and the read control signal QR are stored in a 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 are alternately performed for 1 ms in accordance with the switching every 1 ms.

The 20-bit word string data DM (20) written to the memory unit 17 for 1 ms is supplied with the 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.

The switch 20 reads the data from the additional word data group DWT and the memory unit 18 in which the word transmission rate from the word data transmission unit 14 is set to 74.25 MBps according to the control signal CSB from the switch control signal forming unit 16. 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.

The additional word data group DWT having a word transmission rate of 74.25 MBps from the word data transmitting unit 14 has a predetermined code given to 20.
It is composed of a plurality of 20-bit word data including bit word synchronization data. The 20-bit word synchronization data is, for example, a 10-bit word of EAV or SAV included in a Y data sequence as shown in FIG. Data 3FF (Y), 000 (Y) and 000
(Y) and 10-bit word data 3FF (C), 000 (C) and 000 of EAV or SAV included in the P _B / P _R data series as shown in FIG.
3F, which is a 3 word formed based on (C)
F: 3FFh, 00000: 000h and 000: 000h
Are sequentially arranged. 3FF: 3FFh
Are 10-bit word data 3FF (Y) and 3FF
(C) is bit-multiplexed into 20-bit word data, and h indicates hexadecimal notation. Also, 000000h is 2 bits obtained by bit-multiplexing 10-bit word data 000 (Y) and 000 (C).
This is 0-bit word data, and h represents hexadecimal notation.

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 where the additional word data group DWT is inserted is as shown in FIG. 3, for example. You. 3, 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. In the composite 20-bit word string data DZ (20) formed by inserting such an additional word data group DWT, the portion where the additional word data group DWT is inserted is as shown in FIG. 4, for example. You. Also in FIG. 4, 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.

As described above, the composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion section 13 is sent out from the composite data formation section 12, and is converted into parallel / serial (P / S). It is supplied to the conversion unit 21. In the P / S converter 21, the composite 20-bit word string data DZ (20) is subjected to P / S conversion for converting parallel data into serial data, and converted to the composite 20-bit word string data DZ (20). And divides the serial data by, for example, a ninth-order primitive polynomial: X ⁹ + X ⁴ +1.
By performing scramble processing on serial data based on the composite 20-bit word string data DZ (20) by dividing by +1 to form scrambled serial data DZS, 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 digital video signal D
VS1 to DVS4 are in a state where the horizontal blanking period portions are aligned, and the digital video signal D
VS5 'is a digital video signal DVS so that the video data period portion corresponds to the horizontal blanking period portion of each of the digital video signals DVS1 to DVS4.
For example, 20.5H for each of VS1 to DVS4
, And the five-channel digital video signals DVS1 to DVS4 and DVS
20 'word string data DM (20) based on 5'
And three consecutive 20-bit word data 3FF: 3FFh, 000: 0 which are 20-bit word synchronization data.
The composite 20-bit word string data DZ (20) formed by inserting the additional word data group DWT including 00h and 000: 000h is converted into scrambled serial data DZS and transmitted. At this time, in the 20-bit word string data DM (20) based on the 5-channel digital video signals DVS1 to DVS5, three consecutive 20-bit word data 3FF: 3F which are 20-bit word synchronization data
When the portions corresponding to Fh, 000: 000h and 000000: h appear, the 20-bit word string data DM
There is no point in inserting 20-bit word synchronization data into (20).

5 channel digital video signal DVS
1 to DVS4 and DVS5 ′, three consecutive 20-bit word data 3F, which are 20-bit word synchronization data, in the 20-bit word string data DM (20).
F: 3FFh, 00000: 000h and 000: 000h
Is assumed to appear, digital video signals DVS1 to DVS4 and DVS of five channels
When performing multiplexing processing for multiplexing by repeating, for example, sequentially taking out 10-bit addresses from each of them at 5 ′, 6 10-bit word data 3FFh, 6FF, which are continuous in the multiplexed data. 3FFh, 000
h, 000h, 000h and 000h will appear. Therefore, in the 20-bit word string data DM (20), three consecutive 2 bits which are 20-bit word synchronization data
0-bit word data 3FF: 3FFh, 00:00
Whether the portions corresponding to 0h and 000: 000h appear or not is determined by the 5-channel digital video signals DVS1 to DVS1.
In the data multiplexed by performing multiplexing processing on the DVS 4 and the DVS 5 ′, six consecutive 10-bit word data 3FFh, 3FFh, 000h, 000h, 0
It is a matter of whether 00h and 000h appear. In this regard, such portions will not appear in the multiplexed data for the following reasons.

5 channel digital video signal DVS
1 to DVS4 and DVS5 ′, the multiplexed data obtained by performing the multiplexing process includes six consecutive 1s in the multiplexed data.
0-bit word data 3FFh, 3FFh, 000h,
000h, 000h and 000h appear in (1)
Each of the first and second 10-bit word data 3FFh is a 5-channel digital video signal DVS1 to DVS1.
Timing reference data EAV in DVS4 and DVS5 ', 3FFh in SAV or 3Fh in auxiliary data
(2) First to fourth 10-bit word data 000h following two 10-bit word data 3FFh and 3FFh are obtained based on the digital video signals DVS1 to DVS4 and DVS of five channels.
This is a case where the condition is satisfied based on 000h in the timing reference data EAV or SAV or 000h in the auxiliary data in VS5 '.

However, the digital video signals DVS1 to DVS4 and DVS5 'of the five channels are such that the horizontal blanking periods of the digital video signals DVS1 to DVS4 are aligned, and the digital video signal DVS5' is Video signal DVS1
In order to make the video data period part correspond to the horizontal blanking period part for each of the DVS4, for example, for each of the digital video signals DVS1 to DVS4, for example,
There is a time difference of 20.5H. Therefore, from the digital video signals DVS1 to DVS4, 3FFh or 000h in the timing reference data EAV or SAV in the horizontal blanking period portion,
Alternatively, when 3FFh or 000h in the auxiliary data is obtained, the digital video signal DVS5 'is not a horizontal blanking period portion in which the timing reference data EAV and SAV, the auxiliary data, etc. are present, but is a video data period portion. Digital video signal DVS
5 ′, the timing reference data EA in them
3FFh or 000h in V or SAV or 3FFh or 000h in auxiliary data cannot be obtained.

Therefore, the above conditions (1) and (2) are not satisfied, and the digital video signals DVS1 to DVS1 of five channels are not satisfied.
Six consecutive 10-bit word data 3FFh, 3FFh, 000h, 00 are included in multiplexed data obtained by performing multiplexing processing on DVS4 and DVS5 ′.
0h, 000h and 000h do not appear. That is, in the 20-bit word string data DM (20), three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 000: 20 which are 20-bit word synchronization data.
The portion corresponding to 000h does not appear.

FIG. 5 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, DVP4 and DVP5 are set such that digital video signals DVP1 to DVP4 among them are directly supplied to the 20-bit word string data forming unit 30, and digital video signal DVP5 among them. Is converted into a digital video signal DVP5 'in the time difference providing section 31, and is supplied to the 20-bit word string data forming section 30. The time difference providing unit 31 causes the digital video signal DVP5 to have a predetermined time difference with respect to each of the digital video signals DVS1 to DVP4.
Is a digital video signal DVP5 ′.

[0048] each of the digital video signal DVP1~DVP5 of these 5 channels s is multiplexing process is formed is subjected to a Y data sequence and P _B / P _R data sequence shown in A and B in FIG. 10, A 10-bit quantized digital signal in the form of a word multiplexed data format as shown in FIG. 11, parallel data having a bit transmission rate of, for example, 27 MBps, which is word-synchronized with each other It is said. The digital video signals DVP1 to DVP5 arrive in a state where the horizontal blanking periods are aligned.

The digital video signals DVP1 to DVP1 to DVP
The VP4 is supplied to the 20-bit word string data forming unit 30 with the horizontal blanking period portions aligned, but the digital video signal DVP5 is converted by the time difference providing unit 31 into the digital video signals DVP1 to DVP1.
In order to make the video data period part correspond to the horizontal blanking period part of each of the VP4, the digital video signal DVP5 ′ having a time difference with respect to each of the digital video signals DVP1 to DVP4 is sent to the 20-bit word string data forming unit 30 as Supplied. At this time, the digital video signal DVP5 '
Is set to, for example, 20.5H, where H is a time corresponding to one horizontal period, with respect to each of the digital video signals DVP1 to DVP4.

In the 20-bit word string data forming unit 30, the digital video signals DVP1 to DVP4 are in a state where the horizontal blanking period portions are aligned with each other, and the digital video signal DVP5 'is converted to the digital video signals DVP1 to DVP4. In order to make the video data period part correspond to the horizontal blanking period part for each of the digital video signals DVSP to DVP4, the digital video signals DVSP to DVP4 have a time difference of 20.5H, for example. The five-channel digital video signals DVP1 to DVP4 and DVP5 ′ are subjected to multiplexing processing for multiplexing by repeating, for example, sequentially taking out one word = 10 bits from each of them, thereby increasing the word transmission rate. Is a 20-bit word with, for example, 67.5 MBps Obtain data DM (20). Then, the 20-bit word string data DM (20) obtained from the 20-bit word string data forming section 30 is supplied to the composite data forming section 32.

In the composite data forming section 32, the 20-bit word string data DM (20) is supplied to the speed converting / data inserting section 33. Further, the speed conversion / data insertion unit 33 receives, from the word data transmission unit 34, additional word data composed of a plurality of 20-bit word data including 20-bit word synchronization data to which a predetermined code has been assigned. A group DWT is provided.

Then, in the rate conversion / data insertion unit 33, the word transmission rate is set to 67.5 MBps.
For the bit word string data DM (20), the word transmission rate is, for example, from 67.5 MBps to 74.2.
A speed conversion for converting to 5 MBps is performed, and at a predetermined word interval, the speed conversion from the word data transmitting unit 34 is performed.
An additional word data group DWT including 0-bit word synchronization data is inserted, so that the word transmission rate based on the 5-channel digital video signals DVS1 to DVS4 and DVS5 'can be set to, for example, 74.25 MBp.
The composite 20-bit word string data DZ (20) is formed as s.

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 that of the speed conversion / data insertion unit 13 shown in FIG. 1 is performed, whereby the portion in which the additional word data group DWT is inserted becomes For example, as shown in FIG. 3 or FIG.
Compound 20-bit word string data D at 25 MBps
Z (20) is obtained.

As described above, the composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion section 33 is sent from the composite data formation section 32 and supplied to the P / S conversion section 35. Is done. P / S converter 35
, The composite 20-bit word string data DZ (2
0), P for converting parallel data into serial data
/ S conversion to obtain composite 20-bit word string data DZ
While obtaining serial data based on (20), the serial data is converted into, for example, a ninth-order primitive polynomial: X ⁹ +
By performing a scramble process on serial data based on the composite 20-bit word string data DZ (20) by dividing by X ⁴ +1 and further dividing by the formula: X + 1,
The scrambled serial data DZS is formed, and the serial data DZS is supplied to the transmitting unit 36.

The transmitting unit 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 digital video signal D
VP1 to DVP4 are in the state where the horizontal blanking period portions are aligned, and the digital video signal D
VP5 'is a digital video signal DVP corresponding to the horizontal blanking period of each of the digital video signals DVP1 to DVP4.
For example, for each of VP1 to DVP4, 20.5H
5 digital video signals DVP1 to DVP4 and DVP in a state where a time difference has occurred.
20 'word string data DM (20) based on 5'
And three consecutive 20-bit word data 3FF: 3FFh, 000: 0 which are 20-bit word synchronization data.
The composite 20-bit word string data DZ (20) formed by inserting the additional word data group DWT including 00h and 000: 000h is converted into scrambled serial data DZS and transmitted. Become. At this time, in the 20-bit word string data DM (20) based on the 5-channel digital video signals DVP1 to DVP4 and DVP5 ', three consecutive 20-bit word data 3FF: 3FFh, 000 which are 20-bit word synchronization data. : 000h and 00:00
When a portion corresponding to 0h appears, the scrambled 20-bit word string data DM (20) has 20 bits.
Although there is no point in inserting bit word synchronization data, the five-channel digital video signals DVS1 to DVS4 and DVS obtained in the example shown in FIG.
For the same reason as in the case of the 20-bit word string data DM (20) based on 5 ', the 20-bit word string data DM (20) based on the five-channel digital video signals DVP1 to DVP4 and DVP5'
Three consecutive 20-bit word data 3FF: 3FFh, 000 in the bit word string data DM (20):
The parts corresponding to 000h and 000: 000h do not appear.

FIG. 6 shows a composite 20-bit word string transmitted from the transmission unit 22 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 the claims of the present application. An example of a data receiving device that receives a transmission signal SZ based on scrambled serial data DZS obtained by converting data DZ (20) is shown.

In the example of the data receiving apparatus shown in FIG. 6, 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 41 is provided 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 41 reproduces the scrambled serial data DZS based on the received transmission signal SZ, and converts it into serial / parallel (S / P) conversion / synchronous data detection. To the unit 42.

In the S / P conversion / synchronous data detection section 42, 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 42, the scrambled serial data D
The serial data obtained by subjecting the ZS to the descrambling process is subjected to S / P conversion so that, for example, as shown in FIG. 7A or FIG.
The composite 20-bit word string data DZ (20), which is parallel data of 25 MBps, is formed. And S
Composite 20 obtained from / P conversion / synchronous data detection unit 42
The bit word string data DZ (20) is supplied to the speed conversion / synchronization data separation unit 43.

The S / P converter / synchronous data detector 42
, 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 42.
Three consecutive 20-bit word data 3FF: 3FF in the additional word data group DWT in (20)
Corresponding to the last of h, 000: 000h and 000: 000h, it is obtained as shown in FIG. 7B or FIG. 8B. Note that the arrow t in FIGS. 7 and 8 indicates the passage of time.

As described above, the synchronous data detection output signal SWS obtained from the S / P conversion and synchronous data detecting section 42
Is supplied to the control signal forming unit 44. Then, in the control signal forming section 44, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The speed conversion / synchronization data separation section 43 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection section 42 has a synchronization control signal from the control signal formation section 44. CW is also provided. And
In the speed conversion / synchronization data separation unit 43, 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 43 is
Supplied to In the data separation unit 45, 20 bit data in each 20-bit word data constituting the 20-bit word string data DM (20) from the speed conversion / synchronization data separation unit 43 are sequentially grouped into 10 groups of 10 bits each. The state where the data is divided and the bit data of each group is individually taken out continues, and
5-channel digital video signals DVS1, DVS each being serial data based on the bit word string data DM (20) and having a bit transmission rate of 270 Mbps.
VS2, DVS3, DVS4 and DVS5 'are formed separately from each other. Thereby, the data separation unit 45
From the reproduced 5-channel digital video signal D
VS1 to DVS4 and DVS5 'are derived.

As described above, digital video signals DVS1 to DVS4 and DV of five channels each being serial data having a bit transmission rate of 270 Mbps.
Each of S5 'is reproduced. Then, the reproduced digital video signals DVS1 to DVS4 are in a state where the horizontal blanking period portions are aligned, and the reproduced digital video signals DVS5 ′ are the digital video signals DVS1 to DVS4. In order to make the video data period part correspond to the horizontal blanking period part, for example, a time difference of 20.5H is generated for each of the digital video signals DVS1 to DVS4.

FIG. 9 shows a composite 20-bit word string transmitted from the transmission unit 36 in the example of the data transmission apparatus shown in FIG. 5 according to the example of the data transmission method according to the invention described in the claims of the present application. An example of a data receiving device that receives a transmission signal SZ based on scrambled serial data DZS obtained by converting data DZ (20) is shown.

In the example of the data receiving apparatus shown in FIG. 9, 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 51 is provided for receiving a transmission signal SZ which is an optical signal suitable for the data transmission path. When receiving the transmission signal SZ, the receiving unit 51 reproduces the scrambled serial data DZS based on the received transmission signal SZ, and supplies it to the S / P conversion / synchronization data detection unit 52. .

In the S / P conversion / synchronous data detecting section 52, 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 52, the serial data D
The serial data obtained by subjecting the ZS to the descrambling process is subjected to S / P conversion so that, for example, as shown in FIG. 7A or FIG.
The composite 20-bit word string data DZ (20), which is parallel data of 25 MBps, is formed. And S
Composite 20 obtained from / P conversion / synchronous data detection unit 52
The bit word string data DZ (20) is supplied to the speed conversion / synchronization data separation unit 53.

The S / P converter / synchronous data detector 52
, 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 the composite 20-bit word string data DZ detected by the S / P conversion / synchronization data detection unit 52, for example.
Three consecutive 20-bit word data 3FF: 3FF in the additional word data group DWT in (20)
Corresponding to the last of h, 000: 000h and 000: 000h, it is obtained as shown in FIG. 7B or FIG. 8B.

As described above, synchronous data detection output signal SWS obtained from S / P conversion / synchronous data detection section 52
Is supplied to the control signal forming unit 54. Then, in the control signal forming section 54, the synchronous data detection output signal SW
A synchronization control signal CW based on S is formed.

The speed conversion / synchronization data separation unit 53 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection unit 52 is provided with a synchronization control signal from the control signal formation unit 54. CW is also provided. And
In the speed conversion / synchronization data separation section 53, 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) having a word transmission rate of 67.5 MBps obtained from the rate conversion / synchronization data separation section 53 is
Supplied to In the data separation section 55, 20 bit data in each 20-bit word data constituting the 20-bit word string data DM (20) from the speed conversion / synchronization data separation section 53 are sequentially grouped into 10 groups of 10 bit data. The state of being separated and individually taken out continues, whereby the 20-bit word string data DM (2
0), and digital video signals DVP1, DVP2, DVP3, DVP4, and DVP5 'of five channels, each of which is parallel data having a word transmission rate of 27 MBps, are formed separately from each other. Thereby, the reproduced 5-channel digital video signals DVP1 to DVP4 and DVP5 ′ are output from the data separation unit 55.
Is derived.

In this manner, the digital video signals DVP1 to DVP4 and DVP of the five channels each being converted into parallel data having a word transmission rate of 27 MBps.
Each of 5 'is reproduced. The reproduced digital video signals DVP1 to DVP4 are in a state where the horizontal blanking period portions are aligned, and the reproduced digital video signals DVP5 ′ are the digital video signals DVP1 to DVP4. In order to make the video data period part correspond to the horizontal blanking period part, it is assumed that a time difference of, for example, 20.5H is generated for each of the digital video signals DVP1 to DVP4.

In the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 1 or FIG. 5, the digital video signal of five channels provided for the multiplexing process is Among them, the four-channel digital video signal is set in a state where the horizontal blanking period portions are aligned, and the other one-channel digital video signal is set for each of the four-channel digital video signals. In order to make the video data period part correspond to the horizontal blanking period part, the digital video signals of four channels are set to have a time difference of, for example, 20.5H. 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 five channels, but can be any plural channels. Regarding the video signal, in providing the multiplexing process, other than at least one of them is set to a state in which the horizontal blanking period portion is aligned, and at least one of the other is used for the other. In order to make the video data period part correspond to the horizontal blanking period part, it is possible to make a time difference with respect to the other parts.

Further, in the example of the data transmission method carried out by using the example of the data transmission apparatus shown in FIG. 1, a digital video signal which is multiplexed and transmitted as 5 channels of serial data Transmission speed,
For example, it is set to 270 Mbps.
The bit transmission rate of each of the multiplexed 5-channel serial data digital video signals 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. 5, the digital video signal converted into multiplexed 5-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 5-channel parallel data is not limited to 27 MBps.

[0076]

As is apparent from the above description, at least one of the data transmission methods according to the inventions described in any one of claims 1 to 6 in the claims of the present application is described. Except for the others, the horizontal blanking interval portions are aligned, and at least one has a time difference with respect to the other to make the video data interval portion correspond to the horizontal blanking interval portion for the other. The composite 20-bit word string data formed based on the plurality of digital video signals in a state and transmitted to be converted into serial data and transmitted is a 20-bit word provided with a predetermined code. Synchronous data is included, and such 2
The 0-bit word synchronization data is, for example, a plurality of 20-bit word data to which a predetermined code is assigned, as in the data transmission method according to the second aspect of the present invention. Only when the additional word data group is inserted into the 20-bit word string data obtained by performing multiplexing processing on a plurality of digital video signals, It is assumed to appear.

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. The word synchronization data required for the process of reproducing a plurality of digital video signals from the composite 20-bit word string data obtained based on the received serial data. You. Therefore, on the receiving side, the received composite 20
The data synchronization state required for the reproduction processing of a plurality of digital video signals based on the bit word string data is as follows:
A state where it can be reliably obtained is secured.

In the data transmission method according to any one of the first to sixth aspects of the present invention, a predetermined code is provided. The 20-bit word string data with the added 20-bit word synchronization data into serial data, transmitting the converted serial data, receiving the serial data on the receiving side, and receiving the 20-bit data of the received serial data. The conversion into 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 an HDTV system. Therefore, according to the data transmission method according to any one of the first to sixth aspects of the present invention,
For digital video signal as the Y data sequence and P _B / P _R data sequence of the digital video signal in the form, relatively easily with a means that can adjust it for multiplexing and transmitting them more reproducibly Can be done.

Further, in the data transmission apparatus according to the invention described in claim 7 of the present application, a composite 20 bit transmitted to be converted into serial data and transmitted by data transmitting means is transmitted. The word string data includes 20-bit word synchronization data to which a predetermined code is given.
The 0-bit word synchronization data is obtained by, for example, selecting a plurality of 20-bit word data to which a predetermined code has been assigned to be continuous with a specific arrangement, and performing a multiplexing process on a plurality of digital video signals. 20
Only when the additional word data group is inserted into the bit word string data, it appears in the composite 20-bit word string data. Then, the 20-bit word synchronization data given the predetermined code and included in the composite 20-bit word string data is received 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 serial data obtained, On the receiving side, a state is ensured in which a data synchronization state required for the reproduction processing of a plurality of digital video signals based on the received composite 20-bit word string data is reliably obtained.

According to the data transmission apparatus according to the seventh aspect of the present invention, a 20-bit word synchronous data to which a predetermined code is added 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,
A plurality of them can be reproduced and multiplexed and transmitted.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 9 is a block diagram illustrating an example of a data transmission device in which the example of the data transmission method according to the invention described in 2, 3, 5, or 6 is implemented.

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

[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] 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. 5] Claims 1 and 2 in the claims of the present application.
FIG. 9 is a block diagram illustrating an example of a data transmission device in which an example of the data transmission method according to the invention described in 2, 4, 5, or 6 is implemented.

[Fig. 6] Claim 1, Claim 1 in the claims of the present application.
FIG. 9 is a block diagram showing an example of a data receiving device that receives a transmission signal transmitted according to the example of the data transmission method according to the invention described in 2, 3, 5, or 6.

FIG. 7 is a time chart for explaining an operation of the example of the data receiving apparatus shown in FIG. 6;

FIG. 8 is a time chart for explaining the operation of the example of the data receiving apparatus shown in FIG. 6;

FIG. 9: Claim 1 in the claims of the present application
FIG. 9 is a block diagram showing an example of a data receiving apparatus that receives a transmission signal transmitted according to the example of the data transmission method according to the invention described in 2, 4, 5, or 6.

FIG. 10 is a conceptual diagram provided for describing an example of a data format of a digital video signal.

FIG. 11 is a conceptual diagram provided for describing an example of a data format of a digital video signal.

[Explanation of symbols]

10, 30... 20-bit word string data forming unit,
11, 31: time difference providing unit, 12, 32: composite data forming unit, 13, 33: speed conversion / data inserting unit, 14, 34: word data sending unit, 1
5, 20: switch, 16: switch control signal forming unit, 17, 18: memory unit, 19:
Memory control signal forming unit, 21, 35 P / S converter, 22, 36 transmitter, 41, 51 receiver, 42, 52 S / P conversion / synchronous data detection , 43, 53 ... speed conversion / synchronous data separation unit,
44, 54 ... control signal forming section, 45, 55 ...
Data separation unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 11/24 F term (Reference) 5C057 AA03 BA11 CA07 CB08 DA06 EA02 EA07 EB02 EL01 GF08 GG04 GG06 GG07 5C063 AA11 AB03 AB07 AC01 DA13 DA20 5K047 AA12 CC04 CC08 DD02 GG33 GG42 HH04 HH42 LL01

Claims (7)

[Claims] 1. A digital video signal other than at least one of the plurality of digital video signals is set in a state where a horizontal blanking period portion is aligned, and the at least one of the plurality of digital video signals is horizontal with respect to the other one. In order to make the video data period part correspond to the blanking period part, a multiplexing process is performed on the plurality of digital video signals to form 20-bit word string data under a state where a time difference is generated with respect to the other ones. Then, a transmission rate conversion process is performed on the 20-bit word string data, and an additional word data group including 20-bit word synchronization data provided with a predetermined code is inserted at predetermined word intervals. To form composite 20-bit word string data, convert the composite 20-bit word string data into serial data, Data transmission method for transmitting in order to transmit data. 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. Other than at least one of the plurality of digital video signals, the horizontal blanking period portions are aligned, and at least one of the plurality of digital video signals is horizontally aligned with the other. In order to make the video data period part correspond to the blanking period part, a multiplexing process is performed on the plurality of digital video signals to form 20-bit word string data under a state where a time difference is generated with respect to the other ones. 20-bit word string data forming means, and 20 obtained from the 20-bit word string data forming means.
A transmission rate conversion process is performed on the bit word string data, and an additional word data group including 20-bit word synchronization data to which a predetermined code is given is inserted at a predetermined word interval. Compound data forming means for forming bit word string data; and data sending means for converting the compound 20-bit word string data obtained from the compound data forming means into serial data and transmitting the serial data for transmission. Data transmission device provided.