JP2000350170A - 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-DVS5 of 5 channels are fed to a 20-bit word stream data generating section 11, which obtains 20-bit word stream data DM(20) from each of the signals DVS1-DVS5. The 20-bit word stream dada DM(20) are fed to a rate conversion.data insertion section 13 of a composite data generating section 12. Furthermore, an attached word data group DWT consisting of a plurality of 20-bit word stream data including 20-bit word synchronization data to which a predetermined code is assigned from a word data transmission section 14 is supplied to the rate conversion and data insertion section 13.

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 in each horizontal period in the Y data sequence and a portion corresponding to a part of the video data period before and after the horizontal blanking period.
The B of FIG. 10, there is shown a portion corresponding to a portion of the video data period in the horizontal blanking period and before and after in each horizontal period 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); 3FF and 000 are represented in hexadecimal, and (Y) represents a word in the Y data series. ) Timing reference code data (S
AV: Start of Active Video), and immediately after a portion corresponding to each video data period, four words (3FF (Y), 00) each having a 10-bit configuration.
0 (Y), 000 (Y), XYZ (Y)) of timing reference code data (EAV: End of Active Vid).
eo). 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);
3FF and 000 are in hexadecimal notation, and (C) is P _B /
Indicating that it is a word in P _R data series. ), And immediately after the portion corresponding to each video data period, 4 words (3FF (C), 000 (C), 000) each having a 10-bit configuration.
(C), XYZ (C)). Of course, EAV and SAV Each of the in Y data sequence, Y data is arranged in a portion corresponding to the horizontal blanking period in the sequence, also people P _B / P _R data in the sequence of the EAV and SAV husband, P disposed in a portion corresponding to the horizontal blanking period in _B / P _R data sequence.

[0006] 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 the portion corresponding to the horizontal blanking period, each of the EAV and SAV are disposed has been made to the synchronization is performed, the word multiple data series as shown in FIG. 11 , Formed as a 10-bit quantized digital signal. In a word multiplexed data sequence, immediately before a portion corresponding to each video data period, 8 words (3FF) each having a 10-bit configuration are used.
(C), 3FF (Y), 000 (C), 000 (Y),
000 (C), 000 (Y), XYZ (C), XYZ
(Y)), each of which has a 10-bit configuration immediately after a portion corresponding to each video data period.
Words (3FF (C), 3FF (Y), 000 (C),
000 (Y), 000 (C), 000 (Y), XYZ
(C), XYZ (Y)) are provided.

A digital video signal in the form of a word multiplex data sequence is converted from parallel data to serial data, subjected to scrambling, and transmitted in the form of a transmission signal that is converted into an electric signal or an optical signal. .

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 multiplying the received transmission data by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1. Plays back serial data.

[0010]

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, conventionally, the above-mentioned 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.

[0012] 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
_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. The present invention also provides a data transmission device used for the implementation.

[0013]

According to a first aspect of the present invention, there is provided a data transmission method for multiplexing a plurality of digital video signals. A 20-bit word string data is formed by performing transmission rate conversion processing on the 20-bit word string data, and includes a 20-bit word synchronization data provided with a predetermined code at a predetermined word interval. Insert an additional word data group
The composite 20-bit word string data is formed, the composite 20-bit word string data is converted into serial data, and the serial data is transmitted.

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 multiplexing a plurality of digital video signals to form a 20-bit word string data. The column data forming means and the 20-bit word string data obtained from the 20-bit word string data forming means are subjected to transmission rate conversion processing, and are provided with a predetermined code at predetermined word intervals. Compound data forming means for forming compound 20-bit word string data by inserting an additional word data group including word synchronization data;
Data transmission means for converting composite 20-bit word string data obtained from the composite data forming means into serial data and transmitting the serial data for transmission.

In the data transmission method according to any one of the first to sixth aspects of the present invention, the data is transmitted after being converted into serial data. The transmitted composite 20-bit word string data based on a plurality of digital video signals includes 20-bit word synchronization data to which a predetermined code is given. 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. Are selected to be continuous with the array of 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 obtained 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. .

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, a plurality of digital data transmitted by the data transmission means after being converted into serial data and transmitted. The composite 20-bit word string data based on the video signal includes 20-bit word synchronization data to which a predetermined code is given, and such 20-bit word synchronization data includes, for example, a predetermined code. A plurality of 20-bit word data to which the assignment has been made is selected to be continuous with a specific arrangement. Then, given a predetermined code, the 20-bit word synchronization data included in the composite 20-bit word string data is the composite 20-bit synchronization data including the same.
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 at a receiving side receiving serial data based on the bit word string data Therefore, the receiving side is required for the reproduction processing of a plurality of digital video signals based on the received composite 20-bit word string data. A state in which the data synchronization state can be reliably obtained is secured.

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.

[0020]

FIG. 1 shows an embodiment of a data transmission method according to the present invention described in claims 1, 2, 3 or 6 of the present invention. 7 shows an example of a data transmission device according to the invention described in claim 7 of the present invention.

In the example shown in FIG.
Channel digital video signals DVS1, DVS2,
DVS3, DVS4 and DVS5 are supplied to the 20-bit word string data forming unit 11. Each of the five channels of the digital video signal DVS1~DVS5 is multiplex processing to the Y data sequence and P _B / P _R data sequence shown in A and B of Figure 10 is formed is subjected, as shown in FIG. 11 The bit transmission rate obtained by subjecting a 10-bit quantized digital signal having a mode of a word multiplexed data format to conversion into serial data and performing scramble processing, for example,
It is serial data of 270 Mbps and is bit-synchronized with each other.

In the 20-bit word string data forming section 11, digital video signals DVS1 to DVS1 of five channels are provided.
The DVS 5 is subjected to a multiplexing process of sequentially taking out, for example, 10 bits from each of them and multiplexing them to obtain 20-bit word string data DM (20) having a word transmission rate of, for example, 67.5 MBps. . And 20
The 20-bit word string data DM (20) obtained from the bit word string data forming unit 11 is
2 is supplied.

In the composite data forming section 12, 20-bit word string data DM (20) is supplied to the speed conversion / data insertion section 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.

In the rate conversion / data insertion unit 13, 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 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, whereby the word transmission rate based on the 5-channel digital video signals DVS1 to DVS5 is set to, for example, 74.25 MBps.
The 0-bit word string data DZ (20) is formed.

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 VS5
Is supplied to the switch 15. The switch 15 responds to a control signal CSA from the switch control signal forming unit 16,
Switching is performed at predetermined intervals, for example, at intervals of 1 ms, whereby the 20-bit word string data DM (20) is
The memory unit 17 and the memory unit 18 are alternately supplied every 1 ms, and the 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, a clock signal CA having a frequency of 270 MHz synchronized with the clock signal in each of the five-channel digital video signals DVS1 to DVS5 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 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 read out during the next 1 ms in accordance with the read control signal QR having a frequency of 74.25 MHz. , 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 an additional word data group DWT from the word data transmission section 14 at a word transmission rate of 74.25 MBps and the memory section 18 in response to the control signal CSB from the switch control signal forming section 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.

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
Is 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.
H is in hexadecimal notation
You. Also, 000: 000h is 10-bit word data
Data 000 (Y) and 000 (C) are bit-multiplexed and 2
0-bit word data, where h is hexadecimal
Indicates that it is a display.

The additional word data group DWT having a word transmission rate of 74.25 MBps from the word data transmission 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 unit 13 is sent from the composite data formation unit 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). Forming serial data DZS based on the serial data DZS and transmitting the serial data DZS
Feed to 2. The transmission unit 22 transmits the serial data DZS
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 a 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 data transmission path formed and transmitted. Thereby, transmission of the serial data DZS is performed.

As described above, three consecutive 20-bit word data 3F, which is 20-bit word synchronous data, is added to the 20-bit word string data DM (20) based on the 5-channel digital video signals DVS1 to DVS5.
F: 3FFh, 00000: 000h and 000: 000h
20-bit word string data DZ (20) formed by inserting an additional word data group DWT including
Is converted into serial data DZS and transmitted. At this time, in each of the five-channel digital video signals DVS1 to DVS5 subjected to the multiplexing process in a state where the scramble process is performed, 20 bits are used. Three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 000:
When a portion where 000h is formed appears, 2
There is no point in inserting the 20-bit word synchronization data into the 0-bit word string data DM (20).

A 5-channel digital video signal DV to be subjected to multiplexing processing after being subjected to scramble processing.
Three consecutive 20-bit word data 3 as 20-bit word synchronization data in each of S1 to DVS5
FF: 3FFh, 000,000: 000h and 00000: 000
The part where h will be formed is a series of six 10
Bit word data 3FFh, 3FFh, 000h, 0
00h, 000h, and 000h are portions corresponding to those converted into serial data. That is, the digital video signal DV of 5 channels subjected to the scramble processing
In each of S1 to DVS5, six consecutive 10-bit word data 3FFh, 3FFh, 000h, 00
The problem is whether or not a portion corresponding to the data obtained by converting 0h, 000h and 000h into serial data appears.
In this regard, such portions will not appear substantially for the following reasons.

First, assuming that m is an integer equal to or greater than 10 and that there is a continuous portion of m-bit "0" in each of the digital video signals DVS1 to DVS5 subjected to the scramble process, the scramble process of the portion is performed. The previous original data is A (X); m-bit “0” sequence; B (X) and B (X) as arbitrary data;
(X) is multiplied by a formula (X + 1) and a ninth-order primitive polynomial: (X ⁹ + X ⁴ +1), that is, [A
(X); m bits of “0” continuation; B (X)] × (X +
1) × (X ⁹ + X ⁴ +1) = [A (X); m bits of “0” continuous; B (X)] × G (X), where G
(X) = (X + 1) × (X ⁹ + X ⁴ +1)).

Thus, [A (X); m-bit "0"
[Continuation of m bits of “0”] × G (X) in data expressed as B (X)] × G (X) is XXX
XXXXXXX is 10 bits obtained by adding the results of A (X) × G (X), and YYYYYYYYYY is B
XXXXXXXXXXX0... 0YYYYYYY as 10 bits obtained by adding the result of (X) × G (X)
YYY, where 0... 0 is a series of m-10 bits of “0”. Such data: XXXXXX
XXXXXX0... 0YYYYYYYYYY are digital video signals DVS1 to DVS5 before scramble processing.
It is considered that may be present in the respective result of the scramble processing, the probability of consecutive m-bit "0" is generated on the basis of such data, because it depends on the scrambling initial value, it is considered as 2 ^-10 Can be.

Also, assuming that in each of the scrambled digital video signals DVS1 to DVS5, n is an integer of 10 or more and that there is a portion where n-bit "1" continues, the scrambling process of that portion is performed. The previous original data is A (X); n-bit "1"sequence; B (X) and B (X) as arbitrary data;
(X) is multiplied by a formula (X + 1) and a ninth-order primitive polynomial: (X ⁹ + X ⁴ +1), that is, [A
(X); n bits of “1” continuation; B (X)] × (X +
1) × (X ⁹ + X ⁴ +1) = [A (X); n-bit “1” continuation; B (X)] × G (X), where G
(X) = (X + 1) × (X ⁹ + X ⁴ +1)).

Thus, [A (X); n-bit "1"
Of data; B (X)] × G (X)
Where [continuation of n-bit “1”] × G (X) is
[Continuation of n-bit “1”] × (X + 1) = Xⁿ+1
Because there is (Xⁿ+1) × (X ⁹+ X^Four+1) = (X⁹
+ X^Four+1) × Xⁿ+ (X⁹+ X^Four+1) and XX
XXXXXXXXXX is the sum of the results of A (X) × G (X)
10 bits and YYYYYYYYYY is B
10 bits obtained by adding the result of (X) × G (X)
XXXXXXXXXXX0 ... 0YYYYYYY
YYY, (where 0... 0 is n-10 bits
(Continuation of “0”). Such data: XXXXXX
XXXXXX0 ... 0YYYYYYYYYY is
Digital video signals DVS1 to DVS5 before the amble processing
It is thought that each of the
As a result, based on such data, a series of n-bit “1” s
The probability that the connection will occur depends on the initial scramble value.
And 2^-TenCan be considered.

Thus, the digital video signals DVS1 to DVS of the five channels subjected to the scramble processing are obtained.
5, each of 6 consecutive 10-bit word data 3FFh, 3FFh, 000h, 000h, 000
The probability that a portion corresponding to the data obtained by converting h and 000h into serial data appears is as small as 2 ^-60 ,
Can be practically ignored. Therefore, the digital video signal DV of 5 channels subjected to the scramble processing
In each of S1 to DVS5, six consecutive 10-bit word data 3FFh, 3FFh, 000h, 00
It can be considered that portions corresponding to those obtained by converting 0h, 000h and 000h to serial data do not substantially appear.

FIG. 5 shows an example of a 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 supplied to the 20-bit word string data forming unit 31. Each of the five channels of the digital video signal DVP1~DVP5 is multiplex processing to the Y data sequence and P _B / P _R data sequence shown in A and B of Figure 10 is formed is subjected, as shown in FIG. 11 A 10-bit quantized digital signal having such a word multiplexed data format as described above, and is a parallel data having a word transmission speed of, for example, 27 MBps, and is word-synchronized with each other.

In the 20-bit word string data forming section 31, digital video signals DVP1 to DVP1 of five channels are provided.
In DVP5, from each of them, for example, 1 word = 1
A multiplexing process for sequentially extracting and multiplexing the 0-bit data as 10-bit data is performed to form 20-bit word string data DM (20) having a word transmission rate of, for example, 67.5 MBps. At this time, scramble processing is performed on the 10-bit data by dividing the sequentially extracted 10-bit data by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1 and further by dividing the expression by X + 1 to perform scramble processing. The multiplexing process is performed on the 10-bit data thus obtained to obtain word string data DM (20). Then, the 20-bit word string data DM (20) having a word transmission rate of 67.5 MBps obtained from the 20-bit word string data forming section 31 is combined with the composite data forming section 3.
2 is supplied.

In the composite data forming section 32, the 20-bit word string data DM (20) from the 20-bit word string data forming section 31 is converted into a speed conversion / data inserting section 33.
Supplied to 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 section 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, whereby the word transmission rate based on the five-channel digital video signals DVP1 to DVP5 is set to, for example, 74.25 MBps.
The 0-bit word string data DZ (20) is formed.

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 where 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
The serial data DZS based on (20) is formed, and the serial data DZS is supplied to the transmission unit 36. The transmission unit 36 transmits the serial data DZS through, for example, a data transmission line formed using a coaxial cable or an optical fiber, so that an electric signal suitable for a data transmission line formed using a coaxial cable is used. Alternatively, the signal is converted into a transmission signal SZ which is an optical signal suitable for a data transmission path formed by using an optical fiber and transmitted. Thereby, transmission of the serial data DZS is performed.

As described above, 20-bit word string data DM (20) based on 5-channel digital video signals DVP1 to DVP5 is added to three consecutive 20-bit word data 3F as 20-bit word synchronization data.
F: 3FFh, 00000: 000h and 000: 000h
20-bit word string data DZ (20) formed by inserting an additional word data group DWT including
Is converted to serial data DZS and transmitted. At this time, the digital video signal D of 5 channels
10-bit data is sequentially extracted from each of VP1 to DVP5, scramble processing is performed on the extracted 10-bit data, and the scrambled 1
In the 20-bit word string data DM (20) obtained by performing the multiplexing process on the 0-bit data, three consecutive 20-bit word data 3FF: 3FFh, 000000h and 20-bit word synchronization data, which are 20-bit word synchronization data, When a portion corresponding to 000: 000h appears, there is no point in inserting 20-bit word synchronization data into the 20-bit word string data DM (20).

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
When the portions corresponding to 0h and 000000h appear, the digital video signals DVP1 to DVP of five channels are displayed.
10-bit data is sequentially extracted from each of VP5,
In the data obtained by performing scramble processing on the extracted 10-bit data, six consecutive 10-bit data are included.
Bit word data 3FFh, 3FFh, 000h, 0
00h, 000h and 000h will appear in a portion corresponding to the data converted to serial data. However, in this regard, for the same reason as in the case of the scrambled five-channel digital video signals DVS1-DVS5 in the example shown in FIG. 1, the five-channel digital video signals DVP1-DVP5 are used.
10-bit data is sequentially taken out from each of P5, and six consecutive 10-bit word data 3FFh, 3FFh, 000h, 00 are included in data obtained by performing scramble processing on the taken-out 10-bit data.
0h, 000h, and 000h can be considered to have substantially no portion corresponding to those converted into serial data, and therefore, the 20-bit word string data DM
In (20), three consecutive 20-bit word data 3FF: 3FFh, 0 which are 20-bit word synchronization data
It can be considered that the portions corresponding to 00: 000h and 000000h do not substantially 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. 1 shows an example of a data receiving device that receives a transmission signal SZ based on serial data DZS obtained by converting data DZ (20).

In the example of the data receiving apparatus shown in FIG. 6, for example, an electric signal suitable for a data transmission path formed by using a coaxial cable, or an optical signal 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 receiving unit 41 reproduces the serial data DZS based on the received transmission signal SZ, and reproduces the reproduced serial data DZS.
ZS is supplied to a serial / parallel (S / P) conversion / synchronous data detection unit 42.

In the S / P conversion / synchronous data detector 42, the serial data DZS is subjected to S / P conversion,
For example, as shown in FIG. 7A or FIG.
Composite 20-bit word string data DZ (20) that is parallel data with a word transmission rate of 74.25 MBps
Is formed. Then, the composite 20-bit word string data DZ obtained from the S / P conversion / synchronization data detection unit 42
(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.

In this way, 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 a 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) having a word transmission rate of 67.5 MBps obtained from the speed conversion / synchronization data separation unit 43 is converted into a data separation unit 45.
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, DVS2, DVS3, and DVS, each of which is scrambled serial data having a bit transmission rate of 270 Mbps based on bit word string data DM (20).
4 and DVS5 are formed separately from each other. Thereby, the reproduced 5-channel digital video signals DVS1 to DVS5 are derived from the data separation unit 45. In this way, each has a bit rate of 270M.
Each of the 5-channel digital video signals DVS1 to DVS5, which is serial data of bps, is reproduced.

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. 1 shows an example of a data receiving device that receives a transmission signal SZ based on serial data DZS obtained by converting data DZ (20).

In the example of the data receiving apparatus shown in FIG. 9, for example, an electric signal suitable for a data transmission path 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 receiver 51 reproduces the serial data DZS based on the received transmission signal SZ, and reproduces the reproduced serial data DZS.
The ZS is supplied to the S / P conversion / synchronous data detection unit 52.

In the S / P conversion / synchronous data detector 52, the serial data DZS is subjected to S / P conversion,
For example, as shown in FIG. 7A or FIG.
Composite 20-bit word string data DZ (20) that is parallel data with a word transmission rate of 74.25 MBps
Is formed. Then, the composite 20-bit word string data DZ obtained from the S / P conversion / synchronization data detection unit 42
(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, the synchronous data detection output signal SWS obtained from the S / P conversion / synchronous data detector 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 word transmission rate is set to 74.
From 25 MBps, the word transmission rate is 67.
The speed conversion to 5 MBps is performed.

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 unit 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 unit 53 are sequentially converted into 10-bit 10 bit data. The extracted 10-bit data is multiplied by an expression: X + 1, and a ninth-order primitive polynomial: X
By performing a descrambling process on the 10-bit data by multiplying by ⁹ + X ⁴ +1 to obtain 10-bit data before the scrambling process, successively dividing the data into five groups and individually extracting the data, Thereby, based on the 20-bit word string data DM (20),
5-channel digital video signals DVP each of which is parallel data with a word transmission rate of 27 MBps
1, DVP2, DVP3, DVP4 and DVP5 are formed as being separated from each other. Thereby, the reproduced 5-channel digital video signals DVP1 to DVP5 are derived from the data separation unit 55. In this way, each of the five-channel digital video signals DVP1 to DVP5, which is converted into parallel data with a word transmission rate of 27 MBps, is reproduced.

In the example of the data transmission method implemented using the example of the data transmission apparatus shown in FIG. 1 or FIG. 5, for example, a digital video signal of five channels is multiplexed and transmitted. However, the number of digital video signals to be multiplexed and transmitted is not limited to five channels, but may be any number of channels.

Further, in the example of the data transmission method implemented using the example of the data transmission apparatus shown in FIG. 1, the digital video signal which is multiplexed and transmitted as five-channel 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.

[0068]

As apparent from the above description, according to the data transmission method according to any one of the first to sixth aspects of the present invention,
The composite 20-bit word string data based on a plurality of digital video signals to be transmitted after being converted to serial data and transmitted includes 20-bit word synchronization data provided with a predetermined code. The 20-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. It is selected as a series with an array. 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 obtained serial data. Therefore, on the receiving side, the received composite 2
A state in which the data synchronization state required for the reproduction processing of a plurality of digital video signals based on the 0-bit word string data can be reliably obtained.

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, a plurality of digital data transmitted by the data transmission means after being converted into serial data and transmitted. The composite 20-bit word string data based on the video signal includes 20-bit word synchronization data to which a predetermined code is given, and such 20-bit word synchronization data includes, for example, a predetermined code. A plurality of 20-bit word data to which the assignment has been made is selected to be continuous with a specific arrangement. Then, given a predetermined code, the 20-bit word synchronization data included in the composite 20-bit word string data is the composite 20-bit synchronization data including the same.
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 at a receiving side receiving serial data based on the bit word string data Therefore, the receiving side is required for the reproduction processing of a plurality of digital video signals based on the received composite 20-bit word string data. A state in which the data synchronization state can be reliably obtained is secured.

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 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.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 13 is a block diagram showing an example of a 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, or 6 is implemented. is there.

FIG. 2 is a block diagram showing a specific configuration example of a rate conversion / data insertion unit in the example of 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, 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, or 6.

[Fig. 5] 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. 6] Claim 1, Claim 1 in the claims of the present application.
FIG. 7 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, 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 data video signal.

FIG. 11 is a conceptual diagram explaining an example of a data format of a digital data video signal.

[Explanation of symbols]

11, 31... 20-bit word string data forming unit,
12, 32 ... composite data forming unit, 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, 21,3
5 ... P / S converter, 22, 36 ... transmitter,
41, 51 ... receiving unit, 42, 52 ... S / P conversion / synchronous data detecting unit, 43, 53 ... speed conversion
Synchronous data separation unit, 44, 54 ... control signal formation unit, 45, 55 ... data separation unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 7/00 H04N 7/13 Z H04N 7/24 7/167 Z 7/167 F-term (Reference) 5C059 KK41 KK43 LB01 RB01 RB06 RB10 RB12 RC02 RC11 RC22 RD03 RE04 RF01 SS02 SS03 SS06 UA02 UA31 UA36 5C063 AA11 AB03 AB07 CA16 CA23 CA40 DA07 DA13 DB09 5C064 CA02 CA14 CB01 CC04 5K028 AA06 A0311 SG03 CC03 KK LL01

Claims (7)

[Claims] A multiplexing process is performed on a plurality of digital video signals to form 20-bit word string data. The 20-bit word string data is subjected to a transmission rate conversion process, and at predetermined word intervals, An additional word data group including a 20-bit word synchronization data to which a predetermined code is given is inserted to form composite 20-bit word string data, and the composite 20-bit word string data is converted to serial data. And a data transmission method for transmitting the serial 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
2. A bit-quantized digital signal is obtained by being subjected to scramble processing and serially transmitted, and has a bit synchronous relationship with each other.
Or the data transmission method according to 2. 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. When multiplexing a plurality of digital video signals to form 20-bit word string data,
A method of sequentially extracting bit data of a predetermined number of bits from each of the plurality of digital video signals, performing scramble processing on the extracted bit data, and performing multiplexing processing on the scrambled bit data. The data transmission method according to claim 4, wherein 6. An additional word data group is defined by 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 in a specific arrangement. 6. The data transmission method according to claim 3, wherein the continuous part is selected to include the 20-bit word synchronous data. 7. A 20-bit word string data forming means for multiplexing a plurality of digital video signals to form 20-bit word string data, and a 20-bit word string data 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.