JP2000209174A - Data transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely provide a data synchronization state on a reception side by forming composite 8-bit word string data, converting the composite 8-bit word string data to serial data and transmitting them. SOLUTION: The MPEG image information data a0-a7 of 8 channels are supplied to an 8-bit word string data formation part 11. In the 8-bit word string data formation part 11, the MPEG image information data a0-a7 of the 8 channels are supplied to a speed conversion/word synchronization data insertion part 12 in the state of mutually taking bit synchronization. In the speed conversion/word synchronization data insertion part 12, 8-bit word data are successively formed by one bit each corresponding to each other and 8-bit word string data formed by connecting the 8-bit word data are obtained. By a transmission system for sending out the 8-bit word string data obtained in such a manner to be transmitted, this transmission method capable of multiplexing and transmitting the plural MPEG image information data is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application is based on a plurality of image information data, each of which has been subjected to data compression by high-efficiency coding.
Bit word sequence data is obtained, an additional word data group including word synchronization data is inserted into the obtained 8-bit word sequence data to form composite 8-bit word sequence data, and the composite 8-bit word sequence data is transmitted. The present invention relates to a data transmission method for transmitting data.

[0002]

2. Description of the Related Art In the field of transmission of digital data including information data representing various kinds of signal information such as image information, an electric signal based on digital data is obtained, and is used by a coaxial cable or twisted pair line or the like. A system for transmitting digital data through a transmission line formed by using an optical fiber, and a system for transmitting digital data to an optical signal and transmitting the same through a transmission line formed using an optical fiber have been put into practical use. The transmission format of digital data is an STM (Synchronous Transfer Mode) format in which a fixed frame period is set, and an ATM (Asynchronous Transport Mode) in which a fixed frame period is not set.
nsfer Mode) format.

[0003] The current digital network formed by adopting such a digital data transmission system has been developed based on a telephone line network. With the development of digital network transmission, multiplexing of data and high-speed broadening of signals based on data to be transmitted are inevitably pursued in order to realize efficient data transmission. As one of the techniques for multiplexing digital data and transmitting it as a high-speed wideband signal, SDH (Synchronous
A technology called Digital Hierarchy) has been established in ITU-T (formerly CCIR).

[0004] The SDH proposes a new STM format that is compatible with future high-speed broadband services.
A synchronous multiplexing structure having a basic unit called TM-1 is adopted. STM-1 is 270, as shown in FIG.
A transmission signal having a cycle of nine rows, that is, 270 bytes x 9 = 2,430 bytes, based on the assumption that data division of bytes (Byte; 1 byte = 8 bits (Bit)) constitutes each row. , Such a unit period division is called a “frame”. 2 in each of the 9 rows forming each frame
The first 9 bytes of the 70 bytes form the section overhead (SOH) and the AU point, and the remaining 261 bytes of the 270 bytes form the information area.

[0005] The section overhead and the AU point consist of a total of 9 bytes x 9 = 81 bytes, including A1, A2, B1, B2, C1, D1 to D12, and E1.
1, E2, F1, K1, K2, H1, H2, H3, Z
1 and Z2. These have the contents as shown in FIG. 21, respectively, wherein A1 and A2 (frame pattern) are 8-bit word synchronization data, and are A3 and A3 of three consecutive bytes at the beginning of the first row. The succeeding 3-byte A2 forms a synchronization pattern in each frame. The 8-bit word synchronization data A1 and A
Each of Nos. 2 is assumed to have a predetermined code assigned thereto, and “11110110” is assigned to A1 and “00101000” is assigned to A2.

[0006] One cycle of the STM-1 is set to 125 µsec. Therefore, the transmission capacity is 270 bytes x 9 x 1/1.
25 × 10 ⁻⁶ seconds × 8 = 155.520 megabits / second (155.520 Mbps).

Further, transmission using STM-1 has been further developed, and high-speed transmission in which a plurality of STM-1s are multiplexed has been proposed, and a transmission signal at that time is referred to as STM-N. The STM-N is, for example, as shown in FIG.
-1, # 2,..., STM-1 #n are formed by byte interleaving multiplexing in the data multiplexing unit 10.

As a communication service employing SDH as described above, SONET (Synchronous Optimal
A high-speed data transmission service called “cal Network” is known.

On the other hand, digital data representing image information, that is, image information data, usually has a huge amount of data. It is desired that data compression be performed so that the data amount can be reduced without lowering. Therefore, various researches and developments have been made on data compression techniques to reduce the amount of image information data. One of the results is digital information representing image information, especially moving image information. Regarding data compression for image information data that is data, as a method to implement it,
Moving Picture Experts Group (MPEG), a working group under the Technical Committee under the International Standards Organization
A standard method 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 (hereinafter referred to as MPEG image information data) which has been subjected to data compression by high-efficiency coding according to MPEG. ) That tend to increase.

In the transmission of such MPEG image information data, a predetermined code, such as the above-mentioned word synchronization data A1 and A2, is assigned on the transmission side based on the data to be transmitted. The 8-bit word string data to which the word synchronization data is added is formed, and the 8-bit word string data is transmitted by a transmission method to be transmitted.
For example, in configuring a transmission / reception circuit, for example, an existing integrated circuit element (I
This is desired from the viewpoint that C element and the like can be used effectively.

[0012]

As described above, on the transmitting side, based on the data to be transmitted, 8-bit word string data to which word synchronization data to which a predetermined code is assigned is added is formed. Since it is desired to transmit MPEG image information data using a transmission method in which the 8-bit word string data is transmitted to be transmitted, not only a single MPEG image information data but also a plurality of MPEG image information data are transmitted. If data can be multiplexed and transmitted, efficient use of MPEG image information data can be achieved, and the range of use of MPEG image information data can be expanded. Efficient use of MPEG image information data, expansion of the use range of MPEG image information data, and the like, for example, will result in further development of technology in the field of business or household electronic devices.

However, conventionally, on the transmitting side, 8-bit word string data to which word synchronization data to which a predetermined code is assigned is formed based on data to be transmitted is formed. There is no concrete example that realizes a transmission system capable of multiplexing and transmitting a plurality of MPEG image information data by using a transmission method in which 8-bit word string data is transmitted to be transmitted. Also, there is no document or the like that describes a technique relating to a transmission system capable of multiplexing and transmitting such a plurality of MPEG image information data.

In view of the above, the invention described in the claims of the present application is based on the data to be transmitted, for example, in which a predetermined code assignment such as word synchronization data A1 and A2 is performed. It is possible to multiplex and transmit a plurality of MPEG image information data by a transmission method in which 8-bit word string data to which the word synchronization data is added is formed, and the 8-bit word string data is transmitted to be transmitted. Provide a possible transmission method.

[0015]

According to a first aspect of the present invention, there is provided a data transmission method comprising: an 8-bit word based on a plurality of MPEG image information data; Obtaining column data and inserting an additional word data group including 8-bit word synchronization data to which a predetermined code has been assigned at predetermined word intervals in the obtained 8-bit word sequence data. Thus, the composite 8-bit word string data is formed, the composite 8-bit word string data is converted into serial data, and transmitted to transmit the serial data.

In particular, the data transmission method according to the invention described in each of claims 5, 6, 7 and 8 in the claims of the present application provides a method for transmitting a plurality of MPEG image information data respectively. , Each of which was serial data 8
A plurality of multiplexed MPEG image information, which are serial image data obtained by multiplexing a plurality of individual MPEG image information data, which are MPEG image information data of a channel and which are in a bit synchronization relationship with each other, each being individual serial data. MPEG video information data having 7 or less channels, each of which is serial data, and which are in bit synchronization with each other, and each of which is an 8-bit word. It is assumed that a plurality of pieces of MPEG video information data in the form of column data, which sequentially arrive for each 8-bit word data, are repeated.

According to the data transmission method according to any one of the first to eighth aspects of the present invention as described above, a plurality of MPEG signals to be transmitted are transmitted. Composite 8 based on image information data
The bit word string data includes 8-bit word synchronization data to which a predetermined code is assigned. Such 8-bit word synchronization data is
For example, the 8-bit word synchronization data A1 and A2 used in the SDH are used. Further, for example, three 8-bit word synchronization data A1 are continuously connected, and further, the 8-bit word synchronization data A1 and A2 are successively arranged. It is assumed that three A2s are consecutively arranged.

Then, it is transmitted including 8-bit word synchronization data to which a predetermined code is assigned.
The composite 8-bit word string data based on the plurality of MPEG image information data is converted into 8-bit word synchronization data by the receiving side to reproduce the plurality of MPEG image information data from the composite 8-bit word string data. It is assumed that the required word synchronization data is properly detected. Therefore, on the receiving side, a state is ensured in which the data synchronization state required for the reproduction processing of a plurality of MPEG image information data based on the received composite 8-bit word string data can be reliably obtained. You.

That is, according to the data transmission method according to any one of the first to eighth aspects of the present invention, a predetermined code is set based on data to be transmitted. The 8-bit word string data to which the word synchronization data to which the 8-bit word string data is assigned is formed, and a plurality of MPEG image information data are multiplexed and transmitted according to a transmission method for transmitting the 8-bit word string data. Will be able to do that.

Further, in the data transmission method according to the invention described in each of claims 5, 6, 7 and 8 in the claims of the present application, a plurality of MPs
In obtaining 8-bit word string data based on the EG image information data, a plurality of MPEG image information data are converted into 8-channel MP data each of which is serial data.
EG image information data having a bit synchronization relationship with each other, and a plurality of multiplexed MPEG image information data which are serial data obtained by multiplexing a plurality of individual MPEG image information data each being individual serial data. MPEG video information data of 7 or less channels each being serial data and having a bit synchronization relationship, and 8-bit word string data each having a bit synchronization relationship with each other. And a plurality of MPEG video information data, which repeatedly arrives at each 8-bit word data. Thereby, 8-bit word string data based on a plurality of MPEG image information data can be obtained reliably.

[0021]

FIG. 1 shows an example of a data transmission apparatus in which an example of a data transmission method according to the invention described in the claims of the present application is implemented.

In the example shown in FIG. 1, 8-channel MPEG image information data a0, a1, a2, a3,
a4, a5, a6 and a7 are supplied to the 8-bit word string data forming unit 11. Each of the eight channels of MPEG image information data a0 to a7 is serial data having a bit transmission rate of, for example, 19.4 Mbps. In the 8-bit word string data forming unit 11, 8
The MPEG image information data a0 to a7 of the channel are supplied to the speed conversion / word synchronization data insertion unit 12 in a state where they are bit-synchronized with each other. The speed conversion / word synchronization data insertion unit 1 includes a word data transmission unit 13.
Supplies an additional word data group DWS composed of a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is assigned.

In the rate conversion / word synchronization data insertion unit 12, for example, as shown in FIG. 2A, the bits arrive in parallel with each other in a bit-synchronized state. To 19.4 Mbps 8
In each of the MPEG image information data a0 to a7 of the channel, for example, a0 / 0 to a7 /
0, a0 / 1 to a7 / 1, a0 / 2 to a7 / 2, ...
································································································· 8 bit word data is formed sequentially by one bit (8 bits in total) corresponding to each other Obtain 8-bit word string data. With respect to the 8-bit word string data based on the 8-channel MPEG image information data a0 to a7 obtained in this way, the word transmission speed is, for example, from 19.4 megabytes / second (19.4 MBps) to 19.44 MBps. And a word data sending unit 1 at a predetermined word interval.
The additional word data group DWS including the 8-bit word synchronization data from No. 3 is inserted, so that the word transmission rate based on 8-channel MPEG image information data a0 to a7 is, for example, 19.44 MBps. The bit word string data DZ (8) is formed.

FIG. 3 shows an example of a specific configuration of the speed conversion / word synchronization data insertion unit 12. In the example shown in FIG. 3, 8-bit word string data DX based on 8-channel MPEG image information data a0 to a7.
(8) is supplied to the switch 15. The switch 15
In accordance with the control signal CSA from the switch control signal forming unit 16, switching is performed at predetermined time intervals, for example, at intervals of 1 ms, whereby 8-bit word string data DX (8)
Are alternately supplied to the memory unit 17 and the memory unit 18 every 1 ms, and the distribution of the 8-bit word string data DX (8) to the memory unit 17 and the memory unit 18 is performed.

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 an 8-channel MPE
A clock signal CA whose frequency synchronized with the clock signal in each of the G image information data a0 to a7 is 19.4 MHz and a clock signal CB whose frequency is 19.44 MHz are supplied. Then, the memory control signal forming unit 19 sets the frequency to 19.
A write control signal QW of 4 MHz is generated, and
The frequency is set to 19.44M based on the clock signal CB.
Hz and a write control signal Q
W and the read control signal QR are stored in the memory unit 17 and the memory unit 1
8 to both.

Thus, in the memory section 17, the 8-bit word string data DX (8)
Is supplied, the 8-bit word string data D
X (8) is written in a state where the word transmission rate is 19.4 MBps according to the write control signal QW having a frequency of 19.4 MHz. Also, in the memory section 18, the 8-bit word string data DX is transmitted through the switch 15.
In the period in which (8) is supplied, the word transmission rate of the 8-bit word string data DX (8) is 19.4 MB in accordance with the write control signal QW having a frequency of 19.4 MHz.
It is written in the state of ps. Therefore, the memory unit 17
The writing of the 8-bit word string data DX (8) in each of the memory sections 18 at a word transmission rate of 19.4 MBps is performed alternately for 1 ms in accordance with the switching of the switch 15 every 1 ms.

The 8-bit word string data DX (8) written into the memory unit 17 for 1 ms is the next 1-bit word data DX (8).
Within ms, the word transmission rate is set to 19.44M according to the read control signal QR whose frequency is set to 19.44 MHz.
The data is read from the memory unit 17 as 8-bit word string data DX ′ (8) of Bps and supplied to the switch 20. Also, the 8-bit word string data DX (8) written in the memory unit 18 for 1 ms is the next 1 m.
During s, the word transmission rate is 19.44 MB according to the read control signal QR whose frequency is 19.44 MHz.
The data is read from the memory unit 18 as 8-bit word string data DX ′ (8) of ps and supplied to the switch 20.
The switch 20 is also supplied with the additional word data group DWS from the word data sending unit 13. The additional word data group DWS has a word transmission speed of 19.
It is assumed to be 44 MBps.

The switch 20 reads an additional word data group DWS with a word transmission speed of 19.44 MBps from the word data transmission unit 13 and reads from the memory unit 18 in response to a control signal CSB from the switch control signal forming unit 16. 8-bit word string data DX '(8) having a word transmission rate of 19.44 MBps and a memory unit 1
7. The word transmission speed read from 19.44MBp
Each of the 8-bit word string data DX '(8) as s is sequentially extracted for a predetermined word period. Thus, as shown in FIG. 2B, the word transmission rate is converted from the switch 20 to the 8-bit word string data DX '(8) whose word transmission rate is converted to 19.44 MBps at a predetermined word interval. Is derived by inserting an additional word data group DWS whose data is 19.44 MBps. Note that the arrow t in FIG. 2 indicates the passage of time.

The additional word data group DWS having a word transmission rate of 19.44 MBps from the word data transmitting unit 13 is composed of a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is assigned. For example, at least one arbitrary 8-bit data is arranged at the start end portion,
Subsequently, three 8-bit word synchronization data A1
(Predetermined code “11110110” is allocated), followed by three 8-bit word synchronization data A2 (predetermined code “00101000” is allocated). Are connected to the terminal.

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. FIG.
In MPEG, 8-bit word data forming the 8-bit word string data DX '(8) read from each of the memory units 17 and 18 shown in FIG. 3 is represented by MPEG. It represents arbitrary 8-bit data.

The additional word data group DWS having a word transmission rate of 19.44 MBps from the word data transmitting unit 13 has, for example, at least one arbitrary 8-bit data at the start end thereof, and Then, three 8-bit word synchronization data A1 are connected, and then, three 8-bit word synchronization data A2 are connected to reach a terminal portion, and the terminal portion also has at least one arbitrary one. It has a configuration in which 8-bit data is arranged.

Such an additional word data group DW
In the composite 8-bit word string data DZ (8) formed by inserting S, the portion where the additional word data group DWS is inserted is as shown in FIG. FIG.
MPEG also uses the memory unit 17 shown in FIG.
, And 18 represent the respective 8-bit word data forming the 8-bit word string data DX ′ (8) read out from each of them, and DX represents arbitrary 8-bit data.

As described above, the composite 8-bit word string data DZ (8) formed in the speed conversion / word synchronization data insertion section 12 is sent from the 8-bit word string data formation section 11 and is converted into parallel / serial data. (P / S)
It is supplied to the conversion unit 21. The P / S converter 21 performs P / S conversion on the composite 8-bit word string data DZ (8) to convert parallel data into serial data, and converts the data into composite 8-bit word string data DZ (8). Forming serial data DZS based on the serial data DZS.
S is supplied to the transmission unit 22. The transmitting unit 22 transmits the serial data DZS through a data transmission path formed using a coaxial cable or an optical fiber, for example, to transmit an electrical signal suitable for a data transmission path formed using a coaxial cable. 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.

FIG. 6 shows an example of a data transmission apparatus in which another example of the data transmission method according to the invention described in the claims of the present application is implemented.

In the example shown in FIG. 6, eight data multiplexing sections 31A, 31B, 31C,..., 31H are provided, and these data multiplexing sections 31A to 31H are provided.
Include three-channel individual MPEG image information data a0, b0 and c0, a1, b1 and c1, a2, b, respectively.
, A7, b7 and c7 are supplied. Individual MPEG image information data a0, b0, c0-a
7, b7 and c7 each have a bit transmission rate of 2
It is serial data of 5.9 Mbps.

The data multiplexing section 31A multiplexes the three-channel individual MPEG image information data a0, b0 and c0, and sets the bit transmission rate to 25.9 Mbps × 3 = 77.
Multiplex MPEG, which is serial data of 7 Mbps
The image information data DM0 is formed. Data multiplexing unit 31B
31H also multiplexes the three-channel individual MPEG image information data a1, b1 and c1 to a7, b7, and c7, each of which is multiplexed MPEG image information which is serial data having a bit transmission rate of 77.7 Mbps. Data DM1, DM2,..., DM7 are formed.

The 8-channel multiplexed MPEG image information data DM0 to DM7, each of which is serial data having a bit transmission rate of 77.7 Mbps, obtained from the data multiplexing units 31A to 31H, respectively, is an 8-bit word string data forming unit. 11 is supplied. In the 8-bit word string data forming unit 11, the multiplexed MPEG image information data DM0 to DM7 of eight channels are supplied to the speed conversion / word synchronization data insertion unit 12 in a state where they are bit-synchronized with each other. . The rate conversion / word synchronization data insertion unit 12 receives a plurality of words including 8-bit word synchronization data to which the word transmission rate is set to 77.76 MBps and to which a predetermined code is assigned from the word data transmission unit 13. Is supplied as an additional word data group DWS composed of 8-bit word data.

In the rate conversion / word synchronization data insertion unit 12, for example, as shown in FIG. 7A, the bits arrive in parallel with each other in a bit-synchronized state. To 77.7 Mbps 8
Channel multiplexed MPEG image information data DM0-DM
7, for example, in FIG.
7/0, b0 / 0 to b7 / 0, c0 / 0 to c7 / 0,.
The 8-bit word data is sequentially formed by one bit corresponding to each other (total of 8 bits) as represented by each of..., Whereby the 8-bit word data is formed continuously. To obtain 8-bit word string data. For 8-bit word string data based on the 8-channel multiplexed MPEG image information data DM0 to DM7 obtained in this way, the word transmission speed is changed from, for example, 77.7 MBps to 77.76 MB.
In addition to performing the speed conversion for converting to ps, at a predetermined word interval, the additional word data group D including the 8-bit word synchronization data from the word data sending unit 13 is added.
For example, as shown in FIG. 7B, the WS is inserted into the 8-bit word string data whose word transmission rate is converted to 77.76 Mbps, and the word transmission rate is increased by 77 at a predetermined word interval. .76 MBps is formed by inserting an additional word data group DWS.
8-channel multiplexed MPEG image information data DM0-D
Word transmission rate of 77.76 Mbps based on M7
To form the composite 8-bit word string data DZ (8). Note that the arrow t in FIG. 7 indicates the passage of time.

Speed conversion / word synchronous data insertion unit 12
Has a specific configuration similar to the specific configuration example shown in FIG. 3, for example. Then, the word data sending unit 1
3, the additional word data group DWS having a word transmission rate of 77.76 MBps is the same as the additional word data group DWS transmitted from the word data transmission unit 13 in the example shown in FIG. It is composed of a plurality of 8-bit word data including the assigned 8-bit word synchronization data. For example, at least one arbitrary 8-bit data is arranged at a start end portion thereof, followed by three 8 bit word data. A structure in which bit word synchronization data A1 is continuous, and subsequently, three 8-bit word synchronization data A2 are continuously connected to the end, or at least one arbitrary 8 bit is provided at the start end portion. Data is arranged, followed by three 8-bit word synchronization data A1. Three 8-bit word synchronization data A2 is continuous reaches the end portion, are those having a structure in which at least one of any 8-bit data is arranged in its end portion.

Such an additional word data group DW
4 or FIG. 5, the composite 8-bit word string data DZ (8) formed by inserting S is the composite 8-bit word string data DZ (8) in which the additional word data group DWS is inserted.
This is the same as the bit word string data DZ (8).

As described above, the composite 8-bit word string data DZ (8) formed in the speed conversion / word synchronization data insertion section 12 is sent out from the 8-bit word string data formation section 11 to generate the P / S It is supplied to the conversion unit 21. The P / S converter 21 performs P / S conversion on the composite 8-bit word string data DZ (8) to convert parallel data into serial data, and converts the data into composite 8-bit word string data DZ (8). The serial data DZS is formed based on the serial data DZS, and the serial data DZS is supplied to the transmission unit 22. The transmission unit 22 converts the serial data DZS into, for example,
An electric signal suitable for a data transmission line formed using a coaxial cable or an optical signal formed using an optical fiber for transmission through a data transmission line formed using a coaxial cable or an optical fiber. The signal is converted into a transmission signal SZ which is an optical signal suitable for the data transmission path and transmitted. Thereby, transmission of the serial data DZS is performed.

FIG. 8 shows an example of a data transmission apparatus in which another example of the data transmission method according to the invention described in the claims of the present application is implemented.

In the example shown in FIG. 8, five-channel MPEG image information data Da, Db, Dc, Dd and De are supplied to an 8-bit word string data forming unit 11. 5-channel MPEG image information data Da to D
e, the bit transmission rate is, for example, 29.162
Mbps. In the 8-bit word string data forming unit 11, the MP of 5 channels
When the EG image information data Da to De are bit synchronized with each other, the speed conversion / word synchronization data insertion unit 1
2 is supplied. In addition, the speed conversion / word synchronization data insertion unit 12 is provided with a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is assigned from the word data transmission unit 13. A word data group DWS is provided. The word transmission rate of the additional word data group DWS is selected to be, for example, 19.44 MBps.

In the speed conversion / word synchronization data insertion unit 12, for example, as shown in FIG. 9A, the bits arrive in parallel with each other in a bit synchronization state. 9 is 29.162 Mbps, for example, in each of the five channels of MPEG image information data Da to De, for example, in FIG.
Each bit data represented as 0, Da1 to De1, Da2 to De2,... Is sequentially fetched in units of 8 bits in order from Da to De and back to Da to form an 8-bit word. Data is formed one after another, thereby obtaining 8-bit word string data in which such 8-bit word data is formed continuously. The 8-bit word string data has a word transmission speed of 2
9.162 Mbps x 5/8 = 18.22625 MBp
s.

The M channel of 5 channels obtained in this way
For 8-bit word string data based on the PEG image information data Da to De, the word transmission speed is, for example,
In addition to performing rate conversion for converting from 18.22625 MBps to 19.44 MBps, it includes 8-bit word synchronous data having a word transmission rate of 19.44 MBps from the word data transmission unit 13 at predetermined word intervals. Insert an additional word data group DWS,
Thus, for example, as shown in FIG. 9B, an 8-bit word string data whose word transmission rate is converted to 19.44 MBps is added at a predetermined word interval to make the word transmission rate 19.44 MBps. The composite 8-bit word string data DZ (8) having a word transmission rate of 19.44 MBps is formed based on 5-channel MPEG image information data Da to De formed by inserting the word data group DWS. Note that the arrow t in FIG. 9 indicates the passage of time.

Speed conversion / word synchronous data insertion unit 12
Has a specific configuration similar to the specific configuration example shown in FIG. 3, for example.
Are five-channel MPEG image information data Da to De
Frequency synchronized with the clock signal in each of
9.162 MHz, the clock signal CB has a frequency of 19.44 MHz, and accordingly, the write control signal QW has a frequency of 2
9.162 MHz × 5/8 = 18.222625 MHz, and the read control signal QR sets the frequency to 19.44M.
Hz, and the word data transmitting unit 1
3 is an additional word data group DW composed of a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is assigned.
S is assumed to have a word transmission rate of 19.44 MBps.

The additional word data group DWS having a word transmission rate of 19.44 MBps from the word data transmitting unit 13 is composed of a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is allocated. For example, at least one arbitrary 8-bit word data is arranged at the start end portion thereof, followed by three 8-bit word synchronization data A1, followed by 3 The 8-bit word synchronization data A2 is connected to the end.

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

As described above, the composite 8-bit word string data DZ (8) formed in the speed conversion / word synchronization data insertion section 12 is sent out from the 8-bit word string data formation section 11 to generate the P / S It is supplied to the conversion unit 21. The P / S converter 21 performs P / S conversion on the composite 8-bit word string data DZ (8) to convert parallel data into serial data, and converts the data into composite 8-bit word string data DZ (8). The serial data DZS is formed based on the serial data DZS, and the serial data DZS is supplied to the transmission unit 22. The transmission unit 22 converts the serial data DZS into, for example,
An electric signal suitable for a data transmission line formed using a coaxial cable or an optical signal formed using an optical fiber for transmission through a data transmission line formed using a coaxial cable or an optical fiber. The signal is converted into a transmission signal SZ which is an optical signal suitable for the data transmission path and transmitted. Thereby, transmission of the serial data DZS is performed.

The transmission signal SZ is assumed to have been subjected to an encoding process using, for example, a CMI code. CMI
As shown in FIG. 11, the code represents “0” as a low-level portion in a period corresponding to a ビ ッ ト bit period and a high-level portion in a period corresponding to a ビ ッ ト bit period. 1
A low level portion or a high level portion during a period corresponding to a bit period is indicated, and every time "1" appears, level switching from a low level portion to a high level portion or from a high level portion to a low level portion is performed. You.

FIG. 12 shows an example of a data transmission apparatus in which another example of the data transmission method according to the invention described in the claims of the present application is implemented.

In the example shown in FIG. 12, 8-bit word string data forming section 11 stores 5-channel MPEG image information data Da, Db, Dc, Dd, and De, each of which is 8-bit word string data. The state of being sequentially supplied in units of each 8-bit word data is repeated. Each of the MPEG image information data Da to De, which is 8-bit word string data, has, for example, a word transmission speed of 2 bits.
9.162 Mbps / 8 = 3.664525 MBps as parallel data.

In the 8-bit word string data forming unit 11, five channels of MPEG image information data Da to D
Each 8-bit word in each of e is sequentially supplied to the speed conversion / word synchronization data insertion unit 12. In addition, the word conversion rate is set to 19.44 MBp from the word data transmission section 13 to the rate conversion / word synchronization data insertion section 12.
s, an additional word data group DW composed of a plurality of 8-bit word data including 8-bit word synchronization data to which a predetermined code is assigned.
S is supplied.

In the speed conversion / word synchronization data insertion unit 12, for example, as shown in FIG. 13A, five channels of MPEG image information in which the state of arriving sequentially in units of 8-bit word data is repeated. In each of the data Da to De, for example, in FIG. 13A, Da0 to Da7, Db0 to Db7, Dc0 to Dc
A word transmission rate of 5 is formed by continuously forming 8-bit word data, as represented by 7,.
X 29.162 Mbps / 8 = 18.22625 MBp
The 8-bit word string data to be s is obtained. For the 8-bit word string data based on the five-channel MPEG image information data Da to De obtained in this way, the word transmission speed is set to, for example, 18.22625.
At the same time as performing speed conversion for converting from MBps to 19.44 MBps, an additional word data group DWS including 8-bit word synchronization data from the word data transmission unit 13 is inserted at a predetermined word interval. As shown in FIG. 13B, an additional word data group DWS having a word transmission rate of 19.44 MBps at a predetermined word interval is added to 8-bit word string data whose word transmission rate is converted to 19.44 MBps. Is formed by inserting a five-channel MPE
Based on the G image information data Da to De, composite 8-bit word string data DZ (8) having a word transmission rate of 19.44 MBps is formed. Note that the arrow t in FIG. 13 indicates the passage of time.

Also in this example, the speed conversion / word synchronization data insertion unit 12 has a specific configuration similar to the specific configuration example shown in FIG. 3, for example.
The clock signal CA has a frequency of 29.162 MHz synchronized with the clock signal of each of the five-channel MPEG image information data Da to De, and the clock signal CB has a frequency of 19.44 MH.
z, and accordingly, the write control signal QW
Has a frequency of 29.162 MHz × 5/8 = 18.226
25 MHz, the read control signal QR has a frequency of 19.44 MHz, and a plurality of data including 8-bit word synchronization data to which a predetermined code is assigned from the word data transmission unit 13. The additional word data group DWS constituted by 8-bit word data has a word transmission speed of 19.44 MBp.
s.

The additional word data group DWS whose word transmission rate from the word data transmitting section 13 is 19.44 MBps is the same as the additional word data group DWS transmitted from the word data transmitting section 13 in the example shown in FIG. Similarly, for example, at least one arbitrary 8-bit word data is arranged at a start end portion thereof, followed by three 8-bit word synchronization data A1, followed by three 8-bit word synchronization data A1. The configuration is such that the bit word synchronization data A2 continues to reach the end.

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

As described above, the composite 8-bit word string data DZ (8) formed in the speed conversion / word synchronization data insertion section 12 is sent out from the 8-bit word string data formation section 11 to generate the P / S It is supplied to the conversion unit 21. The P / S converter 21 performs P / S conversion on the composite 8-bit word string data DZ (8) to convert parallel data into serial data, and converts the data into composite 8-bit word string data DZ (8). The serial data DZS is formed based on the serial data DZS, and the serial data DZS is supplied to the transmission unit 22. The transmission unit 22 converts the serial data DZS into, for example,
An electric signal suitable for a data transmission line formed using a coaxial cable or an optical signal formed using an optical fiber for transmission through a data transmission line formed using a coaxial cable or an optical fiber. The signal is converted into a transmission signal SZ which is an optical signal suitable for the data transmission path and transmitted. Thereby, transmission of the serial data DZS is performed.

FIG. 14 shows composite 8-bit word string data DZ transmitted from the transmission unit 22 in the data transmission apparatus shown in FIG. 1 according to an example of the data transmission method according to the invention described in the claims of the present application. (8) Transmission signal SZ based on serial data DZS obtained by conversion
1 shows an example of a data receiving device that receives a message.

In the example of the data receiving apparatus shown in FIG. 14, for example, an electric signal suitable for a data transmission line 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. The receiving unit 41 transmits the transmission signal SZ
Is received, the serial data DZS based on the received transmission signal SZ is reproduced, and the reproduced serial data DZS is supplied to the serial / parallel (S / P) conversion / word synchronous data detection unit 42.

S / P conversion / word synchronous data detector 42
In this case, serial / parallel conversion is performed on the serial data DZS, and, for example, as shown in FIG. 15A or FIG.
Composite 8-bit word string data DZ (8), which is parallel data of Bps, is formed. Then, the composite 8-bit word string data DZ (8) obtained from the S / P conversion / word synchronization data detection unit 42 is supplied to the speed conversion / word synchronization data separation unit 43.

In the S / P conversion / word synchronization data detecting section 42, the composite 8-bit word string data DZ
In the additional word data group DWS in (8),
It detects three consecutive 8-bit word synchronization data A1 and the following three consecutive 8-bit word synchronization data A2, and sends out a word synchronization data detection output signal SWS. The word synchronization data detection output signal SWS is, for example, a composite 8-bit word string data DZ (8) detected by the S / P conversion / word synchronization data detection unit 42.
, The last of the three consecutive 8-bit word synchronization data A1 and the three consecutive 8-bit word synchronization data A2 in the additional word data group DWS, ie, three 8-bit word synchronizations Data A
The data is obtained as shown in FIG. 15B or FIG. 16B corresponding to the last 8-bit word synchronization data A2 of the one and three 8-bit word synchronization data A2.

Thus, the word synchronous data detection output signal SWS obtained from the S / P conversion / word synchronous data detecting section 42 is supplied to the synchronous signal forming section 44. Then, in the synchronization signal forming section 44, a word synchronization signal CW based on the word synchronization data detection output signal SWS is formed.

S / P conversion / word synchronous data detecting section 42
The word converting signal CW from the synchronizing signal forming unit 44 is also supplied to the speed conversion / word synchronizing data separating unit 43 to which the composite 8-bit word string data DZ (8) is supplied. Then, in the rate conversion / word synchronization data separation section 43, the word transmission rate is set to 19.44 MBps from the composite 8-bit word string data DZ (8) under the control of synchronization by the word synchronization signal CW. The bit word string data DX (8) and the additional word data group DWS are separated and extracted, and the extracted 8-bit word string data DX (8) has a word transmission rate of 19.44 MBps. A rate conversion to a word transmission rate of 19.4 MBps is performed.

Further, in the rate conversion / word synchronization data separation section 43, the word transmission rate is set to 19.4 Mbps.
8-bit word string data DX converted to
The state in which each of the eight bit data in each 8-bit word data constituting (8) is individually taken out continues, and each of the eight bit data based on the 8-bit word string data DX (8) has a bit transmission rate of 19 bits. 8-channel MPEG image information data a0, a1, a2, a3, a4, a5, a6, and a7 are formed as serial data of .4 Mbps. As a result, from the speed conversion / word synchronization data separation unit 43, the reproduced 8-channel MP
EG image information data a0 to a7 are derived.

FIG. 17 shows a composite 8-bit word string transmitted from the transmission unit 22 in the data transmission apparatus shown in FIG. 6 according to another example of the data transmission method according to the invention described in the claims of the present application. Transmission signal S based on serial data DZS obtained by converting data DZ (8)
1 shows an example of a data receiving device that receives Z.

In the example of the data receiving apparatus shown in FIG. 17, similarly to the example of the data receiving apparatus shown in FIG. 14, the receiving section 41, the S / P conversion / word synchronous data detecting section 42 , Speed conversion / word synchronization data separation unit 43
And a synchronizing signal forming section 44, which operate in the same manner as the corresponding sections in the data receiving apparatus shown in FIG.

Then, in the example of the data receiving apparatus shown in FIG.
3, a state in which each of the eight bit data in each of the 8-bit word data constituting the 8-bit word string data DX (8) converted to a word transmission rate of 77.7 MBps is individually extracted. Continuously, based on the 8-bit word string data DX (8), 8-channel multiplexed MPEG image information data DM0, DM1, DM2, DM3, DM4, each being serial data having a bit transmission rate of 77.7 Mbps. DM5
DM6 and DM7 are obtained. Then, from the speed conversion / word synchronization data separation unit 43, the multiplex MP of eight channels
The EG image information data DM0 to DM7 are derived, and the eight data separation units 47A, 47B, 47C, 47D, 47
E, 47F, 47G and 47H, respectively.

In the data separation section 47A, the multiplex MP
Based on the EG image information data DM0, three-channel individual MPEG image information data a0 and b0 each of which is serial data having a bit transmission rate of 25.9 Mbps.
And c0 are derived separately from each other. Similarly, in the data separation section 47B, each of the bit transmission rates is set to 25.9M based on the multiplexed MPEG image information data DM1.
The three-channel individual MPEG image information data a1, b1 and c1, which are serial data of bps, are separated and derived from each other.
Based on the multiplexed MPEG image information data DM2, three-channel individual MPEG image information data a, each of which is serial data having a bit transmission rate of 25.9 Mbps.
2, b2 and c2 are separated from each other and are derived. In the data separation unit 47D, each of the bit transmission rates is 25.9 Mb based on the multiplexed MPEG image information data DM3.
The three-channel individual MPEG image information data a3, b3, and c3, which are serial data of ps, are separated from each other and are derived. In a data separation unit 47E, each bit transmission rate is determined based on the multiplexed MPEG image information data DM4. 3 channel individual MPEG image information data a which is serial data with
4, b4 and c4 are separated from each other and are derived. In the data separation unit 47F, each of the bit transmission rates is 25.9 Mb based on the multiplexed MPEG image information data DM5.
The three-channel individual MPEG image information data a5, b5, and c5, which are serial data of ps, are separated from each other and are derived. In the data separation unit 47G, each of the bit transmission rates is based on the multiplexed MPEG image information data DM6. 3 channel individual MPEG image information data a which is serial data with
6, b6, and c6 are separated from each other and are derived. In the data separation unit 47H, each of the bit transmission rates is 25.9 Mb based on the multiplexed MPEG image information data DM7.
Three-channel individual MPEG image information data a7, b7, and c7, which are serial data of ps, are separated and derived.

Thus, individual MPs each of which is serial data with a bit transmission rate of 25.9 Mbps
EG image information data a0, b0, c0 to a7, b7, c
7 are reproduced.

FIG. 18 shows a composite 8-bit word transmitted from the transmission unit 22 in the data transmission apparatus shown in FIG. 8 according to still another example of the data transmission method according to the invention described in the claims of the present application. An example of a data receiving device that receives a transmission signal SZ based on serial data DZS obtained by converting column data DZ (8) is shown.

In the example of the data receiving apparatus shown in FIG. 18, for example, a receiving unit 41 for receiving a transmission signal SZ transmitted through a data transmission path formed by using a coaxial cable or an optical fiber. Is provided. When receiving the transmission signal SZ, the receiving unit 41 reproduces the serial data DZS based on the received transmission signal SZ, and supplies the reproduced serial data DZS to the S / P conversion / word synchronization data detection unit 42.

S / P conversion / word synchronous data detecting section 42
In FIG. 19, serial / parallel conversion is performed on the serial data DZS, and as shown in FIG. 19A, for example, compound 8-bit word string data DZ which is parallel data having a word transmission rate of 19.44 MBps. (8)
Is formed. Then, the composite 8-bit word string data D obtained from the S / P conversion / word synchronization data detection unit 42
Z (8) is supplied to the speed conversion / word synchronization data separation unit 43.

In the S / P conversion / word synchronous data detecting section 42, the composite 8-bit word string data DZ
In the additional word data group DWS in (8),
It detects three consecutive 8-bit word synchronization data A1 and the following three consecutive 8-bit word synchronization data A2, and sends out a word synchronization data detection output signal SWS. The word synchronization data detection output signal SWS is, for example, a composite 8-bit word string data DZ (8) detected by the S / P conversion / word synchronization data detection unit 42.
, The last of the three consecutive 8-bit word synchronization data A1 and the three consecutive 8-bit word synchronization data A2 in the additional word data group DWS, ie, three 8-bit word synchronizations Data A
It is obtained as shown in FIG. 19B, corresponding to the last 8-bit word synchronization data A2 of the one and three 8-bit word synchronization data A2.

The word synchronous data detection output signal SWS obtained from the S / P conversion / word synchronous data detecting section 42 is supplied to the synchronous signal forming section 44. Then, in the synchronization signal forming section 44, a word synchronization signal CW based on the word synchronization data detection output signal SWS is formed.

S / P conversion / word synchronous data detector 42
The word converting signal CW from the synchronizing signal forming unit 44 is also supplied to the speed conversion / word synchronizing data separating unit 43 to which the composite 8-bit word string data DZ (8) is supplied. Then, in the rate conversion / word synchronization data separation section 43, the word transmission rate is set to 19.44 MBps from the composite 8-bit word string data DZ (8) under the control of synchronization by the word synchronization signal CW. The bit word string data DX (8) and the additional word data group DWS are separated and extracted, and the extracted 8-bit word string data DX (8) is added with a word transmission rate of 19.44 MBps. The transmission speed is 29.162 Mbps × 5/8 = 18.226
A speed conversion to 25 MBps is performed.

Further, in the rate conversion / word synchronization data separation section 43, the word transmission rate is set to 18.22625.
The state in which each of the eight bit data in each 8-bit word data constituting the 8-bit word string data DX (8) converted into the MBps is sequentially taken out five by five continues, and the 8-bit word Column data DX
Based on (8), each has a bit transmission rate of 29.162
5 bits of MPEG image information data Da, Db, Dc, Dd and D, which are serial data of Mbps
e is formed. As a result, from the speed conversion / word synchronization data separation unit 43, the reproduced 5-channel MPE
G image information data Da to De are derived.

FIG. 20 shows a composite 8-bit word transmitted from the transmission unit 22 in the data transmission apparatus shown in FIG. 12 according to still another example of the data transmission method according to the invention described in the claims of the present application. Column data DZ (8)
1 shows an example of a data receiving apparatus that receives a transmission signal SZ based on serial data DZS obtained by converting the data.

In the example of the data receiving apparatus shown in FIG. 20, similarly to the example of the data receiving apparatus shown in FIG. 18, receiving section 41, S / P conversion / word synchronous data detecting section 42 are provided. , A speed conversion / synchronous data separating unit 43 and a synchronizing signal forming unit 44, which operate in the same manner as the corresponding units in the data receiving apparatus shown in FIG.

In the example of the data receiving apparatus shown in FIG. 20, 8-bit word string data DX (8) converted to a word transmission rate of 18.22625 MBps in rate conversion / synchronization data separation section 43. )
Are repeated, and the state in which five pieces of each 8-bit word data are sequentially taken out is repeated, and each of the word transmission speeds is set based on the 8-bit word string data DX (8).
162 Mbps / 8 = 3.642525 MBps 8
5-channel MPEG as bit word string data
Image information data Da to De are sequentially obtained, and are derived from the speed conversion / synchronization data separation unit 43. In this way, each increases the word transmission rate to 3.64525 MBp
Each of the five-channel MPEG image information data Da to De converted into 8-bit word string data s is reproduced.

In the example of the data transmission method according to the invention described in the claims of the present invention, which is carried out using the data transmission apparatus shown in FIG. 8 or FIG. Although image information data is multiplex-transmitted, the multiplexed MPEG
The number of image information data is not limited to five channels, but may be, for example, seven or less channels.

[0082]

As is apparent from the above description, according to the data transmission method according to any one of the first to eighth aspects of the present invention,
The composite 8-bit word string data based on a plurality of MPEG image information data to be transmitted includes 8-bit word synchronization data to which a predetermined code has been assigned. The 8-bit word synchronization data included in the composite 8-bit word string data is
For example, the 8-bit word synchronization data A1 and A2 used in the SDH are used. Further, for example, three 8-bit word synchronization data A1 are continuously connected, and further, the 8-bit word synchronization data A1 and A2 are successively arranged. It is assumed that three A2s are consecutively arranged. The composite 8-bit word string data based on a plurality of MPEG image information data, which is transmitted including the 8-bit word synchronization data to which the predetermined code is assigned, is received by the receiving side. 8
Since the bit word synchronization data is to be properly detected as word synchronization data required for processing for reproducing a plurality of MPEG image information data from the composite 8-bit word string data, On the side, a state in which the data synchronization state required for the reproduction processing of a plurality of MPEG image information data based on the received composite 8-bit word string data is reliably obtained is secured. .

That is, according to the data transmission method according to any one of the first to eighth aspects of the present invention, a predetermined code is set based on data to be transmitted. The 8-bit word string data to which the word synchronization data to which the 8-bit word string data is assigned is formed, and a plurality of MPEG image information data are multiplexed and transmitted according to a transmission method for transmitting the 8-bit word string data. Will be able to do that.

Further, in the data transmission method according to the invention described in each of claims 5, 6, 7 and 8 in the claims of the present application, a plurality of MPs
In obtaining 8-bit word string data based on the EG image information data, a plurality of MPEG image information data are converted into 8-channel MP data each of which is serial data.
EG image information data having a bit synchronization relationship with each other, and a plurality of multiplexed MPEG image information data which are serial data obtained by multiplexing a plurality of individual MPEG image information data each being individual serial data. MPEG video information data of 7 or less channels each being serial data and having a bit synchronization relationship, and 8-bit word string data each having a bit synchronization relationship with each other. A plurality of MPEG video information data, and a state of sequentially arriving for each 8-bit word data in each of the plurality of MPEG video information data is repeated. Will be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a data transmission device that implements an example of a data transmission method according to the invention described in the claims of the present application.

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

FIG. 3 is a block diagram showing a specific configuration example of a rate conversion / word synchronization data insertion unit in the data transmission device shown in FIG. 1;

FIG. 4 is a time chart for explaining an example of a data transmission method according to the invention described in the claims of the present application;

FIG. 5 is a time chart for explaining an example of a data transmission method according to the invention described in the claims of the present application;

FIG. 6 is a block diagram showing an example of a data transmission device in which another example of the data transmission method according to the invention described in the claims of the present application is implemented.

FIG. 7 is a time chart for explaining another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 8 is a block diagram showing an example of a data transmission device in which still another example of the data transmission method according to the invention described in the claims of the present application is implemented.

FIG. 9 is a time chart for explaining still another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 10 is a time chart for explaining an example of a data transmission method according to the invention described in the claims of the present application.

FIG. 11 is a conceptual diagram serving to explain encoding used in an example of the data transmission method according to the invention described in the claims of the present application.

FIG. 12 is a block diagram showing an example of a data transmission apparatus in which still another example of the data transmission method according to the invention described in the claims of the present application is implemented.

FIG. 13 is a time chart for explaining still another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 14 is a block diagram illustrating an example of a data receiving apparatus that receives a transmission signal transmitted according to an example of a data transmission method according to the invention described in the claims of the present application.

FIG. 15 is a time chart for explaining the operation of the data receiving apparatus shown in FIG. 14;

FIG. 16 is a time chart used for describing the operation of the data receiving device shown in FIG. 14;

FIG. 17 is a block diagram illustrating an example of a data receiving apparatus that receives a transmission signal transmitted according to another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 18 is a block diagram showing an example of a data receiving apparatus for receiving a transmission signal transmitted according to still another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 19 is a time chart used for describing the operation of the data receiving device shown in FIG. 18;

FIG. 20 is a block diagram showing an example of a data receiving apparatus for receiving a transmission signal transmitted according to still another example of the data transmission method according to the invention described in the claims of the present application.

FIG. 21 is a conceptual diagram for explaining STM-1 used for transmitting digital data.

FIG. 22 shows an STM-
FIG. 3 is a conceptual diagram serving to explain STM-N obtained by multiplexing 1s.

[Explanation of symbols]

11 ... 8-bit word string data forming unit, 12 ...
・ Speed conversion ・ Word synchronous data insertion unit, 13: Word data transmission unit, 15, 20: Switch, 1
6 switch control signal forming unit 17, 18, 18
Memory unit, 19 ... memory control signal forming unit, 21
... P / S converter, 22 ... transmitter, 31A-
31H: data multiplexing unit, 41: receiving unit, 4
2... S / P conversion / word synchronous data detection unit, 43
... Speed conversion / word synchronous data separation unit, 44
.Synchronization signal forming unit, 47A to 47H ... data separation unit

Claims (8)

[Claims] 1. An 8-bit word string data based on a plurality of image information data, each of which has been subjected to data compression by high-efficiency coding, and a predetermined word interval is added to the 8-bit word string data. Is inserted, an additional word data group including 8-bit word synchronization data to which a predetermined code is assigned is inserted to form composite 8-bit word string data. A data transmission method for converting to serial data and transmitting the serial data for transmission. 2. An 8-bit word string data based on a plurality of image information data is subjected to transmission rate conversion prior to insertion of an additional word data group.
Data transmission method as described. 3. The data transmission method according to claim 1, wherein the additional word data group is selected to include a portion in which a plurality of the same 8-bit word synchronization data continue. 4. An additional word data group is defined by a portion where a plurality of first 8-bit word synchronization data continues,
4. The data transmission method according to claim 3, wherein the data transmission method includes a portion including a plurality of continuous portions of second 8-bit word synchronization data different from the 8-bit word synchronization data. 5. Eight-channel video information data, each of which is serial data obtained by performing data compression by high-efficiency coding on a plurality of pieces of image information data, and has a bit synchronization relationship with each other. The data transmission method according to any one of claims 1 to 4, wherein: 6. Serial data obtained by multiplexing a plurality of individual video information data, each of which is a serial data obtained by subjecting a plurality of image information data to data compression by individual high efficiency coding. The data transmission method according to any one of claims 1 to 4, wherein the multiplexed video information data of eight channels are in bit synchronization with each other. 7. A plurality of image information data, each of which is serial data obtained by performing data compression by high-efficiency coding, is video information data of 7 channels or less, and is bit synchronous with each other. The data transmission method according to any one of claims 1 to 4, wherein the data transmission method has a relationship. 8. An 8-bit word string data obtained by subjecting a plurality of pieces of image information data to data compression by high-efficiency encoding, wherein each of the plurality of 8-bit word string data is an 8-bit word string. 2. The method according to claim 1, wherein a state of sequentially arriving for each data is repeated.
The data transmission method according to any one of claims 1 to 4.