JP2001053702A - Data transmitting method and data transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely reproduce plural SDTI signals on a reception side by converting compound 20 bits word string data formed by means of inserting an additional word data group containing 20 bits word synchronous data to which a code that is previously set is given into serial data and transmitting it. SOLUTION: In a 8B/10B conversion.20 bits word string data forming part 12, 20 bits word string data DM (20) is formed and it is supplied to a speed conversion.data insertion part 13. Compound 20 bits word string data DZ (20) formed in a speed conversion.data insertion part 13 is transmitted from a compound data forming part 11 and is supplied to a P/S conversion part 21. The P/S conversion part 21 forms serial data DZS to which a scramble processing is executed and supplies the serial data DZS to a transmission part 22. The transmission part 22 converts serial data DZS into a transmission signal SZ made to be an optical signal fitted to a data transmission line and transmits it so as to transmit it through the data transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention described in the claims of the present application performs a multiplexing process and an 8-bit / 10-bit conversion process on a plurality of digital signals to obtain 20-bit word string data. A data transmission method for forming composite 20-bit word string data by inserting an additional word data group containing word synchronization data into the generated 20-bit word string data, and transmitting the composite 20-bit word string data for transmission, and implementation thereof The present invention relates to a data transmission device provided for the above.

[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.

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

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

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

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

On the other hand, digital data representing image information, that is, image information data, usually has a huge amount of data. For example, when the data is transmitted or recorded, the quality of the data is substantially reduced. It is desired that the data is compressed so that the data amount can be reduced without lowering the data amount. Therefore, various researches and developments have been made on data compression techniques for reducing the amount of image information data. One of the results is digital data representing image information, especially moving image information. Regarding data compression for image information data that is
Moving Picture Experts Group (MPEG), a working group under the Technical Committee under the International Standards Organization
A standard system called MPEG, which has been examined and approved as a standard, has been proposed.

In the standard method called MPEG, image information data is subjected to data compression by high-efficiency coding.
When data compression by high-efficiency encoding according to EG is performed, data compression with an extremely high compression rate can be realized.
In addition, there is an advantage that an image reproduced based on the image information data subjected to the data compression can be of high quality. Therefore, in the field of business or home electronic devices such as digital video cameras and digital video tape recorders, image information data (M
PEG image information data) tends to increase.

When transmitting compressed digital video data such as MPEG image information data, and compressed digital video and audio data obtained by adding audio data to the digital video data as serial data through a transmission path. As an interface developed to be used, SDTI (Serial Data Transport
Interface) has been proposed. This SD
TI is the US SMPTE (Society of Motion Pictur)
e and Television Engineers), which is standardized as "SMPTE 305M".

A signal format under the SDTI (SDTI signal format) is, for example, as shown in FIG. FIG. 12A shows one line period in the SDTI signal format when the bit transmission rate when serialized is 270 Mbps, and forms 10-bit word string data in which one word is composed of 10 bits. are doing. Then, one frame period is formed by, for example, 525 line periods formed by connecting 525 lines.

For one line period shown in FIG. 12A, the timing reference code data: EAV (End of
Active Video) and ancillary data (Ancillar
y Data) section and timing reference code data: SAV (S
tart of Active Video), followed by the payload section. EAV and SAV, respectively,
Four words (3FF, 000,000, XYZ; hexadecimal notation (the same applies hereinafter)) having the same word structure and each having a 10-bit structure are sequentially arranged. The auxiliary data section includes header data. In the payload part, user data and an error detection code: CR
C is arranged.

In the header data included in the auxiliary data portion, for example, as shown in FIG.
, An auxiliary signal flag consisting of three words (000, 3FF, 3FF): ADF, followed by data identification: DID, second data identification: SDID, data count: DC, line number: LN0, line number : LN
1, line number error detection code: LNCRC0, line number error detection code: LNCRC1, code and authorized address identification: C & AAI, 16 word destination address, 16 word source address, block type: BT, payload error detection code flag: CRCFL, spare data for header extension: RSV0 to RSV4, header error detection code: HDCRC0, header error detection code: HDCRC1,
Check sum: CS is sequentially arranged. Such header data is composed of a total of 53 words.

An SDT used for transmitting compressed digital video data or video and audio data.
A digital signal formed in accordance with the I signal format (hereinafter referred to as an SDTI signal) is converted from parallel data to serial data, and is usually subjected to scrambling and transmitted in the form of a transmission signal that is converted into an electric signal or an optical signal. Is done.

In the scrambling process in such a 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, and the mark ratio of transmission data (the ratio between "0" and "1") is statistically reduced to 1/2 on average, and the transmission data is primitive polynomial. Is a process that has been performed by the 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 the formula: X + 1, and further multiplying it by a ninth-order primitive polynomial: X ⁹ + X ⁴ +1. Plays back serial data.

[0016]

SUMMARY OF THE INVENTION SDTI as described above
In the signal, upon transmission through a transmission line after being converted into serial data, not only a single SDTI signal but also a plurality of SDTI signals are multiplexed so as to be surely reproduced on the receiving side. 8B / 10B mentioned above
If the transmission can be performed by performing the conversion, the efficient use of the SDTI signal can be achieved while obtaining good transmission quality, and the use range of the SDTI signal can be expanded. Efficient use of the SDTI signal, expansion of the use range of the SDTI signal, and the like, for example, lead to further development of technology in the field of business or household electronic devices. Therefore, from such a viewpoint, a plurality of SDs can be provided by means that can be prepared relatively easily.
There is a need for a method of multiplexing the TI signal so that it can be reliably reproduced on the receiving side, performing 8B / 10B conversion, and transmitting the TI signal.

However, conventionally, SDTI
There is no concrete example that realizes a transmission system capable of transmitting a plurality of signals by multiplexing the signals so as to be surely reproduced on the receiving side and performing 8B / 10B conversion. Further, a document or the like describing a technique relating to a transmission system capable of multiplexing such a plurality of SDTI signals so as to be surely reproduced on a receiving side, performing 8B / 10B conversion, and transmitting the data is not found. .

In view of the above, the invention described in the claims of the present application is designed so that a plurality of SDTI signals can be reliably reproduced on the receiving side by means capable of relatively easily preparing the SDTI signals. Multiplexed with 8B
Provided is a data transmission method capable of performing / 10B conversion and transmitting the data, and a data transmission apparatus provided for implementing the method.

[0019]

According to the data transmission method of the present invention, a plurality of SDTI signals are subjected to multiplexing processing. To obtain word string data, subject the word string data to 8B / 10B conversion processing,
Bit word string data is formed, a transmission rate conversion process is performed on the 20-bit word string data, and a predetermined code is given at predetermined word intervals.
An additional word data group including 0-bit word synchronization data is inserted to form composite 20-bit word string data, the composite 20-bit word string data is converted to serial data, and the serial data is transmitted for transmission. It is assumed.

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

A data transmission apparatus according to a seventh aspect of the present invention includes a data multiplexing means for performing multiplexing processing on a plurality of SDTI signals to obtain word string data; A 20-bit word string data forming means for performing 8-bit / 10-bit conversion processing on the word string data obtained from the multiplexing means and forming 20-bit word string data, and a 20-bit word data obtained from the 20-bit word string data forming means. For column data,
A transmission rate conversion process is performed, and at a predetermined word interval, an additional word data group including 20-bit word synchronization data provided with a preset code is inserted to form composite 20-bit word string data. Speed conversion and data insertion means, and data transmission means for converting composite 20-bit word string data obtained from the speed conversion and data insertion means into serial data and transmitting the serial data for transmission. Is done.

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

The 20-bit word synchronizing data provided with the predetermined code and included in the composite 20-bit word string data is transmitted to the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of SDTI signals from composite 20-bit word string data obtained based on the received serial data. Also, the 20-bit word string data included in the composite 20-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of SDTI signals based on the composite 20-bit word string data received with good transmission quality, 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 a digital video signal under an HDTV system (high definition television system). Therefore, according to the data transmission method according to the invention described in any one of claims 1 to 6 in the claims of the present application, the SDTI signal is provided with a means that can be prepared relatively easily. A plurality of data can be multiplexed so as to be surely reproduced on the receiving side, and can be transmitted after performing 8B / 10B conversion.

Further, in the data transmission apparatus according to the invention described in claim 7 of the present application, a word string obtained by performing multiplexing processing on a plurality of SDTI signals by data multiplexing means. The data is formed by performing 8B / 10B conversion processing by 20-bit word string data forming means and transmission rate conversion processing by speed conversion / data insertion means, and converted into serial data by data transmission means for transmission. The composite 20-bit word string data to be transmitted is given a predetermined code inserted by the speed conversion / data insertion means.
This means that 0-bit word synchronization data is included.
Such 20-bit word synchronization data is selected, for example, as a series of a plurality of 20-bit word data to which a predetermined code is assigned, with a specific arrangement,
2 obtained by multiplexing a plurality of SDTI signals
Only when the additional word data group is inserted into the 0-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 converted by the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of SDTI signals from composite 20-bit word string data obtained based on the received serial data. Also, the 20-bit word string data included in the composite 20-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of SDTI signals based on the composite 20-bit word string data received with good transmission quality, A state where it 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, The transmission circuit device used for transmitting and receiving a digital video signal under the HDTV system can be used, and therefore, a plurality of SDTI signals can be relatively easily prepared by using a plurality of devices on the receiving side. Multiplexing and 8B / 10B conversion so that it can be reliably reproduced by It will be possible.

[0028]

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.
SDTI signal DTI1, DTIS2, D of channel
The TIS 3 and the DTIS 4 are supplied to the data multiplexing unit 10. 4 channel SDTI signals DTI1 to DTI
Each of S4 is represented by S, as shown in FIGS.
A 10-bit quantized digital signal, which is a 10-bit word string data formed in accordance with the DTI signal format, is obtained by performing conversion to serial data.
It is serial data of 270 Mbps and is bit-synchronized with each other.

In the data multiplexing unit 10, for example, as shown in FIGS.
Bit strings V1 / 0, V1 / transmitted as 0 Mbps
1, V1 / 2, V1 / 3, V1 / 4, V1 / 5,...
··· SDTI signal DTIs arriving as bit stream V transmitted at a bit transmission rate of 270 Mbps
2/0, V2 / 1, V2 / 2, V2 / 3, V2 / 4, V
SDTI signal DTI arriving as 2/5,.
S2, bit strings V3 / 0, V3 / 1, V3 / 2, V3 / transmitted at a bit transmission rate of 270 Mbps
S coming as 3, V3 / 4, V3 / 5, ...
The DTI signal DTIS3 and the bit transmission rate are set to 27
Bit strings V4 / 0, V4 / transmitted as 0 Mbps
1, V4 / 2, V4 / 3, V4 / 4, V4 / 5, ...
As shown in FIG. 2, for example, by sequentially taking in 1-bit destinations from each of the SDTI signals DTIs 4 arriving as ・ and sequentially connecting them to 8-bit destinations,
8-bit word data V1 / 0 to V4 / 1, V1 / 2 to
V4 / 3, V1 / 4 to V4 / 5, V1 / 6 to V4 / 7,
······ formed successively, or
For example, by sequentially taking in 8-bit addresses in each of them and connecting them, as shown in FIG. 3, 8-bit word data V1 / 0 to V1 / 7, V2 / 0 to V2 / 7,
V3 / 0 to V3 / 7, V4 / 0 to V4 / 7, ...
Are sequentially formed, and 8-bit word string data DU (8) having a word transmission rate of 270 Mbps × 4/8 = 135 MBps is obtained. Note that FIG.
An arrow t in FIG. 3 indicates a lapse of time.

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

In the 8B / 10B conversion / 20-bit word string data forming section 12, the 8-bit word string data D
U (8) is subjected to an 8B / 10B conversion process in which the 8 bits forming each word in the U (8) are partitioned, and each of the partitioned 8 bits is sequentially converted into 10-bit data. 1 sequentially obtained by the conversion process
The word transmission rate is set to 13 based on 0-bit data.
20-bit word string data DM (20) with 5 MBps / 2 = 67.5 MBps is formed. And 8B /
The word transmission rate obtained from the 10B conversion / 20-bit word string data forming unit 12 is set to 67.5 MBps.
The 0-bit word string data DM (20) is supplied to the speed conversion / data insertion unit 13.

The speed conversion / data insertion section 13 includes, in addition to the 20-bit word string data DM (20), 20-bit word synchronization data to which a predetermined code is assigned from the word data transmission section 14. An additional word data group DWT composed of a plurality of 20-bit word data is supplied. Then, the rate conversion / data insertion unit 13 sets the word transmission rate to 67.5.
20-bit word string data DM (20) with MBps
, The word transmission rate is, for example, 67.5.
At the same time as performing the speed conversion for converting from MBps to 74.25 MBps, an additional word data group DWT including the 20-bit word synchronization data from the word data transmission unit 14 is inserted at predetermined word intervals. SDTI signals DTI1 to DTIs of the channel
4, the word transmission rate is, for example, 74.25.
MBps composite 20-bit word string data DZ (2
0) is formed.

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

A memory control signal forming unit 19 is provided in association with the memory unit 17 and the memory unit 18.
For example, the memory control signal forming unit 19 is supplied with a clock signal CA having a frequency of 270 MHz synchronized with the clock signal in each of the four channels of SDTI signals DTI1 to DTIS4 and a clock signal CB having a frequency of 74.25 MHz. Is done. 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. Read control signal Q at 25 MHz
R 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 set to 67.5 according to the write control signal QW having a frequency of 67.5 MHz.
It is written in the state of MBps. Also, the memory unit 1
8, during the period in which the 20-bit word string data DM (20) is supplied through the switch 15,
The bit word string data DM (20) sets the frequency to 67.
According to the write control signal QW of 5 MHz, writing is performed in a state where the word transmission rate is 67.5 MBps.
Therefore, the writing in the state where the word transmission rate of the 20-bit word string data DM (20) in each of the memory unit 17 and the memory unit 18 is 67.5 MBps is performed alternately for 1 ms in accordance with the switching of the switch 15 every 1 ms. It is done to.

The 20-bit word string data DM (20) written to the memory section 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. , The word transmission rate to 74.
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) with 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 word transmission rate of the additional word data group DWT is set to 74.25 MBps.

The switch 20 reads the additional word data group DWT from the word data transmission unit 14 at the word transmission rate of 74.25 MBps and the memory unit 18 in response to the control signal CSB from the switch control signal forming unit 16. 74.25 MBps
20-bit word string data DM ′ (20)
The word transmission rate read from the memory unit 17 is set to 7
20-bit word string data D at 4.25 MBps
Each of M ′ (20) is sequentially extracted for a predetermined word period. Thus, the switch 20 adds an additional word data group having a word transmission rate of 74.25 MBps to the 20-bit word string data DM '(20) whose word transmission rate is converted to 74.25 MBps at a predetermined word interval. Composite 20 formed by insertion of DWT
Bit word string data DZ (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 2
It is composed of a plurality of 20-bit word data including 0-bit word synchronization data. Then, the 20-bit word synchronization data included therein is, for example, A
And B, three 10-bit word data 3FFh, 000h and 000h (h) corresponding to three words of the EAV included in the SDTI signal format as shown in FIG.
Is a hexadecimal representation, and the same applies to the following.) 3F, which is three word data formed by multiplexing two data groups (two groups)
F: 3FFh, 00000: 000h and 000: 000h
Are sequentially arranged. 3FF: 3FF
h is a bit multiplex of 10-bit word data 3FFh and 10-bit word data 3FFh to form 20-bit word data.
h is obtained by bit-multiplexing 10-bit word data 000h and 10-bit word data 000h into 20-bit word data.

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: 3FF which are 20-bit word synchronous data.
h, 000: 000h and 000: 000h, and other 20-bit word data.

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

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

The composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion unit 13 is
The P / S converter 2 sent from the composite data forming unit 11
1 is supplied. In the P / S converter 21, the composite 2
P / S conversion for converting parallel data into serial data is performed on the 0-bit word string data DZ (20), and the bit transmission rate based on the composite 20-bit word string data DZ (20) is 74.25 × 20 = 1.485 Gbp
s is obtained, and the serial data is converted into, for example, a ninth-order primitive polynomial: X ⁹ + X ⁴ +1
, And scramble processing on the serial data based on the composite 20-bit word string data DZ (20) by dividing by the formula: X + 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 four-channel SDT
The 8-bit word string data DU (8) obtained by performing multiplexing processing on the I signals DDIS1 to DDIS4 has 8B /
In the 20-bit word string data DM (20) formed through the process of performing the 10B conversion processing, three consecutive 20-bit word data 3FF: 3FFh, 000: 000h and 000: 0
Composite 20-bit word string data DZ formed by inserting an additional word data group DWT including 00h
(20) is converted into scrambled serial data DZS and transmitted. At this time, the 8-bit word string data DU (8) contains 8B / 10B
In the 20-bit word string data DM (20) formed through the process of performing the conversion process, the sequence of the code: “0” or “1” becomes 6 or more due to the characteristics of the 8B / 10B code. Therefore, the 20-bit word synchronous data 3FF: 3FFh, 000000h and 00
0: 000h does not appear. Therefore, composite 20
In the bit word string data DZ (20), the 20-bit word synchronization data 3FF: 3FFh, 000: 000000h and 00 included in the additional word data group DWT added to the 20-bit word string data DM (20).
Only 0: 000h plays the role of synchronous data.

The composite 20 in the P / S converter 21
The scrambling process for the serial data based on the bit word string data DZ (20) is not always necessary, and the serial data based on the composite 20-bit word string data DZ (20) is not subjected to the scrambling process and the transmission unit 22 May also be supplied. When serial data based on the composite 20-bit word string data DZ (20) is transmitted without being subjected to scramble processing, an improvement in transmission characteristics is expected.

In the data transmission apparatus shown in FIG. 1 as described above, the P / S conversion section 21 and the transmission section 22 perform bit transmission of composite 20-bit word string data having a word transmission rate of 74.25 MBps. 1.485G rate
The P / S conversion unit 21 and the transmission unit 22 are converted into serial data having a bps and transmitted without being subjected to scramble processing or without being subjected to scramble processing. And an integrated circuit (IC) element provided for transmission of a digital video signal under the following conditions. Therefore, each has a bit transmission rate of 270M
4 channel SD which is serial data to be bps
Assuming that the TI signal can reliably obtain the data synchronization state required for the reproduction process on the receiving side by the 20-bit word synchronization data, the TI signal can be easily prepared without the need to develop new circuit elements and the like. It can be done by means that can do.

FIG. 7 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 SDTI signals DTIP1, DTIP2, D
TIP3 and DTIP4 are supplied to the data multiplexing unit 30. SDTI signals DTIP1 to DTI of four channels
Each of P4 is represented by S, as shown in FIGS.
This is a 10-bit quantized digital signal which is 10-bit word string data formed according to the DTI signal format, and its word transmission rate is, for example, 27 MB.
This is parallel data of ps and is word-synchronized with each other.

In the data multiplexing unit 30, each of the four channel SDTI signals DTIP 1 to DTIP 4
For example, a multiplexing process of multiplexing by repeatedly taking out one word = 10 bits is performed.
The word transmission rate is, for example, 27 MBps × 4/2 =
20-bit word string data DU (2
0) is obtained. Then, 2 obtained from the data multiplexing unit 30
The 0-bit word string data DU (20) is supplied to the composite data forming unit 31.

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

In the 8B / 10B conversion / 20-bit word string data forming section 32, the 20-bit word string data DU (20) is divided into 8 bits, and
An 8B / 10B conversion process for sequentially converting each of the divided 8 bits into 10-bit data is performed.
Based on 10-bit data sequentially obtained by the B / 10B conversion processing, the word transmission rate is set to 54 MBps × 2.
The 20-bit word string data DM (20) with 0 / (8 × 2) = 67.5 MBps is formed. And 8B /
The word transmission rate obtained from the 10B conversion / 20-bit word string data forming unit 32 is set to 67.5 MBps.
The 0-bit word string data DM (20) is supplied to the speed conversion / data insertion unit 33.

The speed conversion / data insertion unit 33 includes, in addition to the 20-bit word string data DM (20), 20-bit word synchronization data to which a predetermined code has been assigned from the word data transmission unit 34. An additional word data group DWT composed of a plurality of 20-bit word data is supplied. Then, in the rate conversion / data insertion unit 33, the word transmission rate is set to 67.5.
20-bit word string data DM (20) with MBps
, The word transmission rate is, for example, 67.5.
At the same time as performing speed conversion for converting from MBps to 74.25 MBps, an additional word data group DWT including 20-bit word synchronization data from the word data transmitting unit 34 is inserted at a predetermined word interval. Channel SDTI signals DTIP1 to DTIP
4, the word transmission rate is, for example, 74.25.
MBps composite 20-bit word string data DZ (2
0) is formed. Thus, the word data sending unit 34
The additional word data group DWT supplied to the rate conversion / data insertion unit 33 from the
4.25 MBps.

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

Then, in the speed conversion / data insertion unit 33, the same operation as that of the speed conversion / data insertion unit 13 shown in FIG. 1 is performed, so that the part where the additional word data group DWT is inserted becomes For example, as shown in FIG. 5 or FIG.
Composite 20-bit word string data DZ (20) with 4.25 MBps is obtained.

The composite 20-bit word string data DZ (20) formed in the speed conversion / data insertion section 33 is
The P / S converter 3 sent from the composite data forming unit 31
5 is supplied. In the P / S converter 35, the composite 2
P / S conversion for converting parallel data to serial data is performed on the 0-bit word string data DZ (20), and the bit transmission rate based on the composite 20-bit word string data DZ (20) is 74.25 MBps × 20 = 1.48
5 Gbps serial data is obtained, and 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 four-channel SDT
8 bits are added to 20-bit word string data DU (20) obtained by performing multiplexing processing on I signals DTIP1 to DTIP4.
2 formed through the process of performing B / 10B conversion processing
In the 0-bit word string data DM (20), three consecutive 20-bit word data 3FF: 3FFh, 000000: 00h and 00 which are 20-bit word synchronization data.
Additional word data group DWT including 0: 000h
Is converted into composite scrambled serial data DZS and transmitted. At this time, 8B / 1 is added to the 20-bit word string data DU (20).
In the 20-bit word string data DM (20) formed through the process of performing the 0B conversion process, 8B / 10
According to the characteristics of the B code, since the continuation of the code “0” or “1” does not exceed 6 or more, the 20-bit word synchronous data 3FF: 3FFh, 000: 000h and 0
00: 000h does not appear. Therefore, composite 2
In the 0-bit word string data DZ (20), 20
20-bit word synchronous data 3FF: 3FFh, 000000h and 0 included in the additional word data group DWT added to the bit word string data DM (20)
Only 00: 000h plays the role of synchronous data.

The composite 20 in the P / S converter 35
The scrambling process for the serial data based on the bit word sequence data DZ (20) is not always necessary, and the serial data based on the composite 20-bit word sequence data DZ (20) is not subjected to the scrambling process and the transmission unit 36 May also be supplied. When serial data based on the composite 20-bit word string data DZ (20) is transmitted without being subjected to scramble processing, improvement in transmission characteristics is expected.

In the data transmission apparatus shown in FIG. 7 as described above, the P / S conversion unit 35 and the transmission unit 36 perform bit transmission of composite 20-bit word string data having a word transmission rate of 74.25 MBps. 1.485G rate
The P / S conversion unit 35 and the transmission unit 36 are converted to serial data having a bps and transmitted without being subjected to scramble processing or without being subjected to scramble processing. And an integrated circuit (IC) element provided for transmission of a digital video signal under the following conditions. Therefore, each has a bit transmission rate of 27 MB
4-channel SDT that is parallel data with ps
Assuming that the I signal can reliably obtain the data synchronization state required for the reproduction process on the receiving side by the 20-bit word synchronization data, the I signal can be easily prepared without the need to develop new circuit elements and the like. It can be done by means that can do.

FIG. 8 shows transmission in the example of the data transmission apparatus shown in FIG. 1 according to the example of the data transmission method according to the invention described in claims 1, 2, 3, 5 or 6 in the claims of the present application. The transmission signal SZ based on the scrambled (or not scrambled) serial data DZS obtained by converting the composite 20-bit word string data DZ (20) sent from the unit 22 1 shows an example of a data receiving device that receives a message.

In the example of the data receiving apparatus shown in FIG. 8, 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. And a receiving unit 40 for receiving a transmission signal SZ which is an optical signal suitable for the data transmission path. When receiving the transmission signal SZ, the receiving unit 40 reproduces the scrambled (or not scrambled) serial data DZS based on the received transmission signal SZ, and reproduces the S / S data. It is supplied to the P conversion / synchronization data detection unit 41.

In the S / P conversion / synchronous data detecting section 41, the scrambled serial data DZ
S is multiplied by the expression: X + 1, and a ninth-order primitive polynomial:
The descrambling process is performed on the scrambled serial data DZS by multiplying by X ⁹ + X ⁴ +1 to obtain the scrambled serial data (or directly take in the scrambled serial data DZS). ).

Further, the S / P converter / synchronous data detector 4
1, the S / P conversion is performed on serial data DZS obtained by performing descrambling processing on the scrambled serial data DZS (or serial data DZS not performing scrambling processing).
As shown in FIG. 9A or FIG. 10A, for example, compound 20-bit word string data DZ which is parallel data with a word transmission rate of 74.25 MBps
Form (20). Then, the composite 20-bit word string data DZ (20) obtained from the S / P conversion / synchronization data detection unit 41 is supplied to the speed conversion / synchronization data separation unit 42.

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

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

The speed conversion / synchronization data separation section 42 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection section 41 is provided with a synchronization control signal from the control signal formation section 43. CW is also provided. And
In the speed conversion / synchronization data separation section 42, under the control of the word synchronization by the synchronization control signal CW, a 20-bit word having a word transmission rate of 74.25 MBps is obtained from the composite 20-bit word string data DZ (20). Column data DM (20) and additional word data group D
The WT and the WT are separated and taken out, and the taken-out 20-bit word string data DM (20) is converted in speed from a word transmission speed of 74.25 MBps to a word transmission speed of 67.5 MBps. Is applied.

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

In the 10B / 8B conversion / 8-bit word string data forming section 44, the 10-bit addresses in the 20-bit word string data DM (20) are divided, and each of the divided 10 bits is divided into 20-bit word string data DM (20). A 10B / 8B conversion process for sequentially converting the data to 8-bit data is performed, and the word transmission rate is set to 135 MB based on the 8-bit data sequentially obtained by the 10B / 8B conversion process.
The 8-bit word string data DU (8) having ps is formed.

The word transmission rate obtained from the 10B / 8B conversion / 8-bit word string data forming section 44 is 135M.
The 8-bit word string data DU (8) having Bps is supplied to the data separation unit 45. In the data separation unit 45, one-bit or eight-bit addresses are sequentially extracted from the 8-bit word string data DU (8), divided into four groups, and the bits of each of the divided groups. The state in which each of the data is individually derived is continued, and the SDTI signal DT of four channels, each of which is serial data with a bit transmission rate of 270 Mbps, based on the 8-bit word string data DU (8)
IS1, DDIS2, DDIS3, and DTIS4 are formed separately from each other. Thereby, the reproduced 4-channel SDTI signal DT is output from the data separation unit 45.
IS1 to DTIS4 are derived.

In this way, each of the four channels of SDTI signals DTIS1 to DTIS4, each of which is serial data having a bit transmission rate of 270 Mbps, is reproduced.

FIG. 11 shows the transmission in the example of the data transmission apparatus shown in FIG. 7 according to the example of the data transmission method according to the invention described in claims 1, 2, 4, 5 or 6 in the claims of the present application. The composite 20 sent from the unit 36
An example of a data receiving apparatus that receives a transmission signal SZ based on serial data DZS that has been subjected to scramble processing (or not subjected to scramble processing) and obtained by converting bit word string data DZ (20). Show.

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

In the S / P conversion / synchronous data detecting section 51, the scrambled serial data DZ
S is multiplied by the expression: X + 1, and a ninth-order primitive polynomial:
The descrambling process is performed on the scrambled serial data DZS by multiplying by X ⁹ + X ⁴ +1 to obtain the scrambled serial data (or directly take in the scrambled serial data DZS). ).

Further, the S / P conversion / synchronous data detector 5
1, the S / P conversion is performed on serial data DZS obtained by performing descrambling processing on the scrambled serial data DZS (or serial data DZS not performing scrambling processing).
As shown in FIG. 9A or FIG. 10A, for example, compound 20-bit word string data DZ which is parallel data with a word transmission rate of 74.25 MBps
Form (20). Then, the composite 20-bit word string data DZ (20) obtained from the S / P conversion / synchronization data detection unit 51 is supplied to the speed conversion / synchronization data separation unit 52.

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

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

The speed conversion / synchronization data separation unit 52 to which the composite 20-bit word string data DZ (20) is supplied from the S / P conversion / synchronization data detection unit 51 is provided with a synchronization control signal from a control signal formation unit 53. CW is also provided. And
In the speed conversion / synchronization data separation section 52, 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 D
The WT and the WT are separated and fetched, and the fetched 20-bit word string data DM (20) is converted from a word transmission rate of 74.25 MBps to a word transmission rate of 67.5 MBps. Is applied.

The word transmission rate obtained from the rate conversion / synchronization data separation section 52 is set to 67.5 MBps.
The bit word string data DM (20) is supplied to a 10B / 8B conversion / 20 bit word string data forming unit 54. The 10B / 8B conversion / 20-bit word string data forming unit 54 includes a synchronization control signal C from the control signal forming unit 53.
W is also supplied.

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

The word transmission rate obtained from the 10B / 8B conversion / 20-bit word string data forming unit 54 is 54M
20-bit word string data DU (20) to be Bps
Is supplied to the data separation unit 55. Data separation unit 55
, 10 bits are sequentially extracted from the 20-bit word string data DU (20), divided into four groups, and 1 of each of the divided groups.
The state in which each of the 0-bit data is individually derived as word data continues, and the 20-bit word string data DU
Based on (20), each has a word transmission rate of 27 MB
4 channel SD which is parallel data with ps
TI signals DTIP1, DTIP2, DTIP3 and DT
IP4s are formed separately from each other. Thereby,
From the data separation unit 55, the reproduced 4-channel SD
The TI signals DTIP1 to DTIP4 are derived.

In this way, each of the four channels of SDTI signals DTIP1 to DTIP4, each of which is parallel data with a bit transmission rate of 27 MBps, is reproduced.

In the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 1 or FIG. 7, four channels of the SDTI signal are subjected to the multiplexing process. 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 SDTI signal provided for the multiplexing process need not be limited to four channels, but may be any plural channels.

Further, in the example of the data transmission method implemented by using the example of the data transmission apparatus shown in FIG. 1, the SDTI signal, which is multiplexed and transmitted as four-channel serial data, is transmitted by each bit transmission. The rate is set to, for example, 270 Mbps.
The bit transmission rate of each of the TI signals is 270 Mbps.
It is not limited to. Further, in the example of the data transmission method implemented using the example of the data transmission apparatus shown in FIG. 7, the SDTI signal which is multiplexed and transmitted as the parallel data of four channels has the respective word transmission rates. For example, although the data rate is set to 27 MBps, the word transmission rate of each of the SDTI signals, which are multiplexed and transmitted as 4-channel parallel data, is also set to 27 MBps.
It is not limited to MBps.

[0085]

As is apparent from the above description, in the data transmission method according to any one of the first to sixth aspects of the present invention, a plurality of SDTI signals are provided. The word sequence data obtained by performing the multiplexing process is subjected to the 8B / 10B conversion process and the transmission speed conversion process, and is formed to be converted into serial data and transmitted to be transmitted.
The bit word string data includes 20-bit word synchronization data given a predetermined code. Such 20-bit word synchronization data is
For example, as in the data transmission method according to the invention described in claim 2 of the present application, a plurality of 20-bit word data to which a predetermined code is assigned is selected to be continuous with a specific arrangement. And
2 obtained by multiplexing a plurality of SDTI signals
Only when the additional word data group is inserted into the 0-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 converted on the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of SDTI signals from composite 20-bit word string data obtained based on the received serial data. Also, the 20-bit word string data included in the composite 20-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of SDTI signals based on the composite 20-bit word string data received with good transmission quality, A state where it can be reliably obtained is secured.

According to the data transmission method according to the invention described in any one of claims 1 to 6 in the claims of the present application, a 20-bit code having a predetermined code is provided. Conversion of the 20-bit word string data to which the word synchronization data has been added into serial data, transmission of the converted serial data, and reception of the serial data on the receiving side, and 20-bit word string data of the received serial data Can be performed using, for example, a transmission circuit device used for transmission and reception of a digital video signal under an HDTV system, and therefore, the SDTI signal can be prepared relatively easily. Means for multiplexing the plurality so that they can be reliably reproduced on the receiving side, and 8B / 1 Performing B conversion, so that can be transmitted.

Also, in the data transmission apparatus according to the invention described in claim 7 of the present application, a word string obtained by performing multiplexing processing on a plurality of SDTI signals by data multiplexing means. The data is formed by performing 8B / 10B conversion processing by 20-bit word string data forming means and transmission rate conversion processing by speed conversion / data insertion means, and converted into serial data by data transmission means for transmission. The composite 20-bit word string data to be transmitted is given a predetermined code inserted by the speed conversion / data insertion means.
This means that 0-bit word synchronization data is included.
Such 20-bit word synchronization data is selected, for example, as a series of a plurality of 20-bit word data to which a predetermined code is assigned, with a specific arrangement,
2 obtained by multiplexing a plurality of SDTI signals
Only when the additional word data group is inserted into the 0-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 converted on the receiving side receiving the serial data based on the composite 20-bit word string data including the same. It is to be properly detected as word synchronization data required for processing for reproducing a plurality of SDTI signals from composite 20-bit word string data obtained based on the received serial data. Also, the 20-bit word string data included in the composite 20-bit word string data is obtained through the 8B / 10B conversion processing, thereby providing good transmission quality. Therefore, on the receiving side, the data synchronization state required for the reproduction processing of a plurality of SDTI signals based on the composite 20-bit word string data received with good transmission quality, A state where it 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, The transmission circuit device used for transmitting and receiving the digital video signal under the HDTV system can be used, and therefore, a plurality of the SDTI signals can be received and received by means that can be prepared relatively easily. Multiplexes and performs 8B / 10B conversion so that it can be reliably reproduced on the side, and transmits the data. So that it is theft.

[Brief description of the drawings]

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

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

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

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

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

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

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

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

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

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

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

FIG. 12 is a conceptual diagram illustrating an example of an SDTI signal format.

[Explanation of symbols]

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

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/08 H04N 7/08 Z 7/081 7/13 Z 7/24 F term (reference) 5C059 MA00 RB01 RB19 RC02 RE00 SS02 SS21 SS30 UA24 5C063 AB03 AB05 CA40 5K028 AA14 BB08 GG00 KK01 MM17 NN01 5K030 HA08 HB01 HB02 JA01 JT01 JT04 LA07 LB15 5K047 AA11 BB02 CC02 FF17 HH01 HH43 LL04

Claims (7)

[Claims] A multiplexing process is performed on a plurality of digital signals each formed according to a specific signal format used for transmitting compressed digital video data or video and audio data to obtain word string data. The 8-bit / 10-bit conversion process is performed on the word-string data to form 20-bit word-string data, and the transmission-rate conversion process is performed on the 20-bit word-string data.
At a predetermined word interval, an additional word data group including 20-bit word synchronization data to which a preset code is given is inserted to form composite 20-bit word sequence data, and the composite 20-bit word sequence is formed. A data transmission method for converting data into serial data and transmitting the serial data for transmission. 2. An additional word data group is selected so as to include, as a 20-bit word synchronization data, a portion in which a plurality of 20-bit word data to which a predetermined code is assigned is connected in a specific arrangement. The data transmission method according to claim 1, wherein: 3. A digital signal according to claim 1, wherein each of said plurality of digital signals is obtained by converting a 10-bit quantized digital signal into serial data, and has a bit synchronous relationship with each other. 2. The data transmission method according to 2. 4. The method according to claim 1, wherein each of the plurality of digital signals is parallel data converted into a 10-bit quantized digital signal and has a word synchronous relationship with each other. Data transmission method. 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, with an additional word data group having 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. Data multiplexing for multiplexing a plurality of digital signals formed according to a specific signal format used for transmitting compressed digital video data or video and audio data to obtain word string data. Means for performing an 8-bit / 10-bit conversion process on the word string data obtained from the data multiplexing means, and forming 20-bit word string data; and a 20-bit word string data forming means. 20 obtained from
The bit word string data is subjected to transmission rate conversion processing, and at a predetermined word interval, an additional word data group including 20-bit word synchronization data to which a preset code is given is inserted, and Speed conversion / data insertion means for forming bit word string data; data transmission for converting composite 20-bit word string data obtained from the speed conversion / data insertion means into serial data and transmitting the serial data for transmission Means for transmitting data.