JP3501105B2 - Data transmission device and data transmission method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention described in the claims of the present application is data transmission for transmitting digital data representing a video signal and digital data representing an audio signal through a data transmission path formed by a coaxial cable or the like. The present invention relates to a device and a data transmission method.

[0002]

2. Description of the Related Art Video data (DV data) and audio data (DA) representing a video signal and an audio signal respectively obtained by digitizing a video signal and an audio signal which are signal elements forming a television broadcast signal. (Data) is transmitted through a data transmission line formed by, for example, a coaxial cable, the DV data and the DA data are usually in accordance with a preset format. As one of the formats used in such a case, what is called a serial data interface format (SDI format) has been proposed.

When the DV data and DA data are transmitted by using the SDI format, the DV data and DA data to be transmitted are, as shown in FIG. 5, each horizontal synchronization in the video signal SV. The data is divided and stored in each of a series of data sections DP that correspond to one line period (1H) starting from the signal SSH and are successively connected. Each data section DP includes an EAV (End of Active Video) portion (timing reference code data portion) having a 4-word structure, an ancillary area portion having a 268-word structure, and a SAV (Start of Act) having a 4-word structure.
ive Video) part (timing reference code data part)
, And a payload area portion of 1440 words, the whole is composed of 1716 words.

In each data division DP, DV data of up to 1440 words is stored in its payload area, and DA is stored in its ancillary area.
Up to 268 words of data are stored. Then, for example, if the DV data and DA data to be transmitted are NT
In the case of a video signal and an audio signal forming a television signal conforming to the SC system, a DV representing one frame period (first and second field periods) of the video signal in 525 consecutive data sections DP. Data and DA data corresponding thereto are stored.

FIG. 6 shows that 525 consecutive data sections D
An example of a state in which DV data representing one frame period of a video signal and corresponding DA data are stored in P (NL represents the number of the data section DP) is shown. In this example, in the payload area portion following the SAV portion which is the timing reference code data portion in each of the 244th data divisions DP from the 20th to the 263th of the continuous 525 data divisions DP 2 which is the first field period of the video signal.
DV data representing 40 line periods is stored, and DA data corresponding to the DV data is stored in 20
Stored in the ancillary area part following the EAV part which is the timing reference code data part in each of the 244th to 263rd data sections DP,
Furthermore, 2 out of 525 consecutive data sections DP
243 data sections D from 83rd to 525th
In each of P, DV data representing 240 line periods corresponding to the second field period of the video signal is stored in the payload area portion following the SAV portion corresponding to the timing reference code data, and the D data
DA data corresponding to V data is from 283rd to 52nd
It is stored in the ancillary area portion following the EAV portion which is the timing reference code data portion in each of the 243 data sections DP up to the fifth.

[0006]

As described above, S
When the DV format and the DA data are transmitted by using the DI format, the data section DP having a payload area part in which the divided DV data is stored and an ancillary area part in which the divided DA data is stored. Are sequentially transmitted through the data transmission line, but one set of DV data and DA data is transmitted for one data transmission line. Therefore, when transmitting different sets of DV data and DA data at substantially the same time or within a common transmission period, even if the transmission destinations are the same, depending on the number of sets of DV data and DA data. Multiple data transmission lines are required.

For example, when 10 sets of DV data and DA data are transmitted substantially simultaneously or to a common transmission destination within a common transmission period, 10 data transmission paths are required. Therefore, if each data transmission path is formed by a coaxial cable, it is required to lay 10 coaxial cables. As described above, providing a plurality of data transmission paths each formed by, for example, a coaxial cable leads to a complicated and large-scaled device or facility for data transmission, and further, for data transmission. It will lead to soaring costs.

In view of the above point, the invention described in the claims of the present application is such that a plurality of sets of DV data and DA data are transmitted at substantially the same time or in common, assuming that they conform to a data format such as an SDI format. It is not necessary to provide a plurality of data transmission paths according to the number of sets of DV data and DA data for transmitting a plurality of sets of DV data and DA data when transmitting to a common destination within a period. As a result, it is possible to avoid the situation that the configuration is complicated and the scale is increased.
Further, the present invention provides a data transmission device and a data transmission method that can reduce the cost for data transmission.

[0009]

A data transmission apparatus according to the invention described in any one of claims 1 to 3 in the claims of the present application comprises a plurality of sets of compressed DV data and DA data. A memory means in which data including a set is written, a control means for controlling a timing of reading data from the memory means, and a series of divided data stored in the memory means under the control of the control means. And a coding means for transmitting a data group composed of a series of data sections so as to be transmitted through one transmission line, and Each has a first timing reference code data portion,
Following the first timing reference code data portion, at least an ancillary area portion in which DA data is stored,
A second timing reference code data portion, and a second timing reference code data portion followed by at least the compressed D
A payload area portion in which V data is stored, and a plurality of compressed DV data are respectively stored in a series of payload area portions included in a series of data sections, and a series of a series of data sections included in a series of data sections. A plurality of DA data are stored in the ancillary area portion.

Further, in the data transmission method according to the invention described in any of claims 4 to 6 in the claims of the present application, a plurality of sets of compressed DV data and DA data are stored in the memory means. , A plurality of sets of compressed DV data and DA data are read from the memory means for each set, and a set of compressed DV data and DA data read from the memory means are sequentially stored. Is formed in accordance with a predetermined format, and a data group composed of a series of data sections is transmitted so as to be transmitted through one transmission path. And a first timing reference code data portion, and an ansilla that stores at least DA data following the first timing reference code data portion. An area portion, and the second time reference code data portion, following the second time reference code data portion, and configured as including a payload area portion of at least the compressed DV data is stored,
Compressed DV data and DA data forming a set are stored in a payload area portion and an ancillary area portion included in each of a series of data sections.

[0012] As described above, the data transmission device according to the invention described in any one of claims 1 to 3 in the claims of the present application, or claims 4 to 4 in the claims of the present application. In the data transmission method according to the invention described in any of items 6 to 6, the compressed D
Each of a series of data divisions formed for transmission of a set of V data and DA data is formed by storing compressed DV data and DA data forming each set in a payload area part and an ancillary area part, respectively. It is said that Then, for example, a data group is formed by a series of data sections including a predetermined number of data sections, and a plurality of video signals, each of which represents a plurality of video signals, are provided in the payload area portion of each of the predetermined number of data sections included in each data group. The compressed DV data is divided and stored. At that time, a plurality of DA data corresponding to a plurality of compressed DV data are divided and stored in the ancillary area portion in each of the predetermined number of data sections included in each data group.

Each data section corresponds to, for example, one line period of the video signal, and, for example, the number of data sections included in each data group forms one frame period of the video signal. It corresponds to the number of line periods, and in each of the predetermined number of data sections, a plurality of compressed DV data representing one frame period of each of a plurality of video signals are divided in the payload area portion. While being stored, a plurality of DA data corresponding to one frame period of each video signal is divided and stored in the ancillary area portion.

Therefore, a plurality of sets of compressed DV data and DA
The data is sequentially stored, for example, in a data group constituted by a predetermined number of series of data sections by the data amount corresponding to one frame period of the video signal. Then, the data group configured in this way is assumed to be capable of being sequentially transmitted through one transmission path formed by a coaxial cable,
Therefore, it is possible to obtain a state in which a plurality of sets of compressed DV data and DA data are transmitted to a common transmission destination substantially at the same time or within a common transmission period.

Therefore, the data transmission device according to any one of claims 1 to 3 in the claims of the present application, or claims 4 to 4 in the claims of the present application According to the data transmission method according to the invention described in any one of 6 to 6, it is assumed that a plurality of sets of compressed DV data and DA data comply with a data format such as an SDI format, substantially simultaneously or in common. During transmission to a common destination within a transmission period, a plurality of sets of compressed DV data and D
It is not necessary to provide a plurality of data transmission paths corresponding to the number of sets of compressed DV data and DA data for the transmission of the set of A data, and therefore the configuration becomes complicated and the scale becomes large. It is possible to avoid the situation of imitation, and further reduce the cost for data transmission.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of the present invention in which an example of a data transmission method according to the invention described in any one of claims 4 to 6 in the claims of the present application is implemented. An example of the data transmission device according to the invention described in any one of claims 1 to 3 in the range is shown.

In the example shown in FIG. 1, through the data input terminals 11A to 11J, 10 kinds of DV data DV1 and DV1 representing 10 different kinds of video signals respectively.
V2, DV3, ..., DV10 are input respectively,
Further, through the data input terminals 12A to 12J, ten kinds of DA data DA1, DA2, DA3 ,.
10 is input respectively.

The 10 types of DV data DV1 to DV10 and the 10 types of DA data DA1 to DA10 are a set of DV data DV1 and DA data VA1, and DV data VD2.
And the DA data VA2, the DV data VD3 and the DA data VA3, ..., The DV data DV10 and the DA data VA10 each form a television broadcasting signal conforming to the NTSC system. Video signal and audio signal to be reproduced. That is, the example shown in FIG. 1 is based on 10 sets of DV data and DA data, each of which represents a video signal and an audio signal forming a television broadcasting signal conforming to the NTSC system, and which are, for example, coaxial. It is supposed to perform a process of forming data that can be transmitted through one transmission line formed by a cable.

Each of the DV data DV1 to DV10 is, for example, 1,440 words = 1, for one line period (video signal one line period) of a video signal corresponding to each of them.
It is represented by 440 × 8 = 15,000 bits. Therefore, assuming that the number of effective image line periods in one frame period of the video signal is 480, each of the DV data DV1 to DV10 corresponds to one frame period of the corresponding video signal (one frame period of the video signal).
1,440 × 480 = 691,200 words = 69
It is represented by 1,200 × 8≈5.53 megabits (Mb).

On the other hand, in each of the DA data DA1 to DA10, a stereo audio signal corresponding to 5 frame periods of the video signal is converted into 32,032 × 2 = 64,064.
The audio signal corresponding to one frame period of the video signal is represented by 6 words.
4,064 / 5 = 12,812.8 words = 64,06
It is represented by 4 × 8 / 5≈102.5 kilobits (Kb). That is, each of the DA data DA1 to DA10 is
A portion (for one frame period of a video signal) that represents an audio signal corresponding to one frame period of a video signal,
It is represented by 64,064 / 5 = 12,812.8 words.

D through the data input terminals 11A to 11J
The V data DV1 to DV10 are data compression units 13A, 1
3B, 13C, ..., 13J, respectively.
In the data compression unit 13A, the data compression processing is performed on the DV data DV1. This DV data DV1
The data compression processing applied to the data is, for example, 1,440 × 480 = 691, 200 words = 69, which represents one video signal frame period in the DV data DV1.
1,200 × 8≈5.53 megabits is 1/10,
That is, 1,440 × 480/10 = 1,440 × 48 =
69,120 words = 69,120 × 8≈553 kilobits. As a result, in the data compression unit 13A, one second corresponds to 30 frame periods, so compressed DV data having a bit rate of 69,120 × 8 × 30≈16.6 megabits / second (Mb / s). DX1 is formed based on the DV data DV1.

Similarly, in the data compression section 13B, compressed DV data DX2 having a bit rate of 16.6 megabits / second or less is formed based on the DV data DV2, and the data compression sections 13C to 13C. Compressed DV data DX3 to DX10 having a bit rate of 16.6 Mbit / sec or less at 13J are formed based on the DV data DV3 to DV10, respectively.

The compressed DV data DX1 to DX10 obtained from the data compression units 13A to 13J are supplied to the memory units (memory means) 14A, 14B, 14C, ..., 14J, respectively. Further, the data input terminals 12A to 12J
The DA data DA1 to DA10 through the memory are directly connected to the memory units (memory means) 15A, 15B, 15C, ...
・, 15J respectively.

Each of the memory sections 14A to 14J and each of the memory sections 15A to 145 has a memory control signal forming section 2.
The write control signal QW from 0 is supplied. And
In the memory units 14A to 14J, the data compression unit 13
Compressed DV data DX1 to DX1 coming from A to 13J
0 is sequentially written in accordance with the write control signal QW. Further, in the memory units 15A to 15J, DA data DA1 coming from the data input terminals 12A to 12J.
DA10 are sequentially written in accordance with the write control signal QW.

The memory sections 14A to 14J have read control signals QX1, QX2, Q from the memory control signal forming section 20.
X3, ..., QX10 are supplied respectively. The read control signals QX1 to QX10 are stored in the memory units 14A to 14A.
For 4J, timing control is performed to make each of them sequentially in a read state for a predetermined period. That is, first, the read control signal QX1 causes the memory section 14A to be in the read state for a predetermined period, and subsequently, when the read state of the memory section 14A ends, the read control signal QX2 is read to the memory section 14B for the predetermined period. When the read state of the memory section 14B is finished, the read control signal QX3 is set.
Causes the memory section 14C to take a reading state for a predetermined period,
Such an operation is sequentially performed until the read control signal QX10 is brought into a state in which the memory section 14J is set to the read state for a predetermined period. Then, when the read state of the memory section 14J ends, the read control signal QX1 returns to the state in which the read control signal QX1 causes the memory section 14A to take the read state for a predetermined period, and the above-described operation is repeated.

In this case, the predetermined period in which the memory units 14A to 14J are in the read state is, for example, 1440 words in each of the compressed DV data DX1 to DX10 written in the memory units 14A to 14J. The period is selected to correspond to the time required for reading. Therefore, in response to the read control signal QX1, 1440 words DXD1 of the compressed DV data DX1 written therein are read from the memory section 14A, and the read control signal QX.
In response to the read control signal QX3, 1440 words of the compressed DV data DX2 written into the memory section 14B are read out from the memory section 14B.
14 of compressed DV data DX3 written to it from C
DXD3 for 40 words is read out ...
.., 1440 of the compressed DV data DX10 written in it from the memory unit 14J in response to the read control signal QX10
The state in which the DXD10 for the word is read is sequentially taken,
And it will be repeated.

In this way, the memory units 14A-14J
1440 of compressed DV data DX1 sequentially read from
Word for DXD1 to compressed DV data DX10 1440
The word portion DXD 10 is supplied to the encoder unit 21.

Each of the compressed DV data DX1 to DX10 written in each of the memory units 14A to 14J has a video signal one frame period of 1,440 × 48 = 69,1.
It is set to 20 words. Therefore, the memory units 14A-1
Each of the compressed DV data DX1 of 1440 words DXD1 to the compressed DV data DX10 of 1440 words DXD10 read from each of 4J is compressed DV data DX.
One video signal for one frame period to compressed DV data DX
1,4 per 10 video signal 1 frame period
40 × 48/1440 = 48 times.

On the other hand, read control signals QA1 and QA from the memory control signal forming section 20 are provided to the memo 0 sections 15A to 15J.
2, QA3, ..., QA10 are supplied respectively.
The read control signals QA1 to QA10 are stored in the memory unit 15
Timing control is performed on A to 15J so that each of them takes a reading state for a predetermined period in sequence. That is, first, the read control signal QA1 causes the memory section 15A to be in the read state for a predetermined period, and subsequently, when the read state of the memory section 15A ends, the read control signal QA2 changes to the memory section 15A.
Let B take the reading state for a predetermined period, and then,
When the read state of the memory section 15B is completed, the read control signal QA3 causes the memory section 15C to take the read state for a predetermined period, and such an operation is performed by the read control signal QA10.
This is sequentially performed until 5J is brought into a reading state for a predetermined period. Then, when the read state of the memory unit 15J is completed, the read control signal QA1 is output again to the memory unit 15A.
Then, the reading state is returned to for a predetermined period, and the above operation is repeated.

In such a case, the DA data D written in each of the memory units 15A to 15J is, for example, during a predetermined period in which the memory units 15A to 15J are in the read state.
A period corresponding to the time required to read 268 words in each of A1 to DA10 is selected. Therefore,
268-word DAD of DA data DA1 written in the memory unit 15A in response to the read control signal QA1
1 is read, DA data DA2 written in the memory unit 15B in response to the read control signal QA2.
, 268 words of DAD2 are read from the memory section 15C in response to the read control signal QA3, and 268 words of DAD3 of DA data DA3 written to the memory section 15C are read. Thus, the state in which the 268-word DAD10 of the DA data DA10 written in the memory unit 15J is read is sequentially taken, and this is repeated.

In this way, the memory units 15A to 15J
DA data DA1 for 268 words DAD1 to DA data DA10 for 268 words DA sequentially read from
D10 is supplied to the encoder unit (encoding means) 21.

In each of the DA data DA1 to DA10 written in the memory units 15A to 15J, one video signal frame period is 64,064 / 5 = 12,81.
It is supposed to be 2.8 words. Therefore, the memory unit 15A to
DA data for 268 words of DA data DA1 from each of 15J1 to DAD for 268 words of DA data DA10
Each of the reading of 10 is performed for one frame period of the video signal of the DA data DA1 to the video signal 1 of the DA data DA10.
64,064 / (5 × 26 for each frame period)
8) ≈ 47.8 times, therefore 48 times.

In the data read operation from the memory sections 14A to 14J and 15A to 15J as described above, the memory control signal forming section 20 for sending the read control signals QX1 to QX10 and QA1 to QA10 is the memory section 14A to 14A.
Thus, a control means for controlling the timing of reading data from J and 15A to 15J is formed.

In the encoder section 21, the memory section 1
Compressed DV data DX sequentially read from 4A to 14J
1440 words worth of DXD1 to compressed DV data DX1
0, 1440 words worth DXD10 and memory unit 15
2 of DA data DA1 sequentially read from A to 15J
68 words DAD1 to DA data DA10 of 268 words DAD10 are sequentially converted into S as shown in FIG.
Formatting to be stored in the payload area portion and the ancillary area portion in the data section DP according to the DI format is performed, and 1440 words of compressed DV data DX1 DXD1 to 1440 words of compressed DV data DX10 DXD10 Of the DA data DA1 and any of 268 words of the DA data DA1 to 268 words of the DAD10 are sequentially stored in the ancillary area portion.

Each of the continuous data sections DP thus formed is composed of an SAV part which is a timing reference code data part followed by a payload area part and an EAV part which is a timing reference code data part followed by an ancillary area part. Is included.

In such formatting in the encoder section 21, 525 consecutive data sections D
Data division group consisting of P is compressed DV data DX
48 forming one frame period of video signal in 1
1440 words worth of DXD1 to compressed DV data DX1
48 to form one frame period of video signal at 0
1440 words worth of DXD10 and DA data D
A video signal in A1 forms one frame period 4
It is prepared to store 48 268-word DADs 10 forming one frame period of a video signal in 8 268-word DAD1 to DA data DA10.
Then, one frame period of the video signal and DA data DA1 to DA1 in each of the compressed DV data DX1 to DX10.
It is assumed that a data division group consisting of 525 data divisions DP storing one frame period of a video signal in each DA 10 is successively connected.

As shown in FIG. 2 (NL represents the number of the data section DP), a data group consisting of 525 data sections DP that are successively connected has 19 pieces from the first to the 19th. In the data section DP, 1440 words worth DXD1 forming one video signal frame period in each of the compressed DV data DX1 to DX10.
To DXD10 and DA data DA1 to DA10, one frame period of the video signal is formed 26.
Eight words of DAD1 to DAD10 are not stored.

Then, in the 240th data section DP from the 20th to the 259th, 2 following the EAV portion which is the timing reference code data portion in each of them.
In the ancillary area portion of 68 words, 268 words worth DAD1 forming one video signal frame period in the DA data DA1 to 268 words worth DAD10 forming one video signal frame period in the DA data DA10 are sequentially stored. The state is repeated, DA
1/2 of one frame period of video signal of data DA1
DA data DA10 of video signal 1 frame period
Each of 268 words of DAD1 to DAD10 each of which forms / 2 is stored.

Also, 1440 following the SAV portion which is the timing reference code data portion in each of the 240th to 259th 240 data sections DP.
In the payload area portion of the word structure, 1440 words forming one frame period of the video signal in the compressed DV data DX1 are formed and 1440 parts forming one frame period of the video signal in the DXD1 to compressed DV data DX10.
The state where the word DXD10 is sequentially stored is repeated to form 1/2 of one video signal frame period of the compressed DV data DX1 to 1/2 of one video signal frame period of the compressed DV data DX10, respectively. Each of the 1440 words DXD1 to DXD10, which is set to 24, is stored.

Next, the compressed DV data DX1 is included in the 23 data sections DP from the 260th to the 282nd.
DDX1 to DXD10 for 1440 words forming one frame period of the video signal in each of DX10 to DX10, and DAD for 268 words forming one frame period of the video signal in each of DA data DA1 to DA10
1 to DAD10 are not stored.

Further, in the 240 data sections DP from the 283rd to the 522nd, the DA data DA1 is added to the ancillary area portion of 268 word structure following the EAV portion which is the timing reference code data portion in each. 268 words worth of DAD1 forming one video signal frame period in DAD1 to DA data of 268 words forming one video signal frame period of DA data DA10 are sequentially stored.
DA data DA1 of video signal 1 frame period 1 /
2 to DA data DAD1 to DAD10 corresponding to 268 words, each of which forms 24 of 1/2 for one frame period of the video signal DA10, are stored.

Further, in each of the 240 data sections DP from the 283rd to the 522nd, 144 following the SAV portion which is the timing reference code data portion.
In the payload area of 0 word, 1440 video signal DXD1 to compressed DV data DX1 forming one frame period DXD1 to compressed DV data DX10
144 to form one frame period of the video signal in
The state in which the DXD10 for 0 words is sequentially stored is repeated, and 1/2 of the video signal of the compressed DV data DX1 for one frame period to the video signal 1 of the compressed DV data DX10.
Each of 1440 words of DXD1 to DXD10, each of which makes up one half of the frame period and is 24, is stored.

The compressed DV data DX1 is recorded in the three data sections DP from the 523nd to the 525th.
DDX1 to DXD10 for 1440 words forming one frame period of the video signal in each of DX10 to DX10, and DAD for 268 words forming one frame period of the video signal in each of DA data DA1 to DA10
1 to DAD10 are not stored.

In this way, in the data group consisting of 525 data sections DP which are successively arranged, the 20th to 259th 240 pieces and the 283rd to 522nd 240 pieces Of 4
In each ancillary area portion of 268 words in each of the 80 data sections DP, one video signal one frame period of the DA data DA1 to one video signal one frame period of the DA data DA10 is formed, and each is formed of 48. 268 words of DAD1 to DAD10 are stored, and 240th to 259th are stored.
And 1440 in each of the 480th to 522nd to the 522nd 240 total 480 data sections DP.
In the payload area of the word structure, one video signal one frame period of the compressed DV data DV1 to one video signal frame period of the compressed DV data DV10 are formed, and 1440 words each of which is 1440 words DXD1 to DXD
Each of D10 is stored. And such a 525
A data group consisting of individual data sections DP is sequentially obtained from the encoder unit 21 and forms multiplexed video and audio data DSD.

The multiplexed video and audio data DSD sent from the encoder unit 21 has 10 types of NT.
A set of DV data DV1 and DA data DA1 representing a video signal and an audio signal forming a television broadcast signal conforming to the SC system, to DV data DV10.
And DA data DA10 as DV data DV1 to D
V10 is included under the compressed DV data DX1 to DX10, respectively, and is transmitted through one transmission line connected to the output end of the encoder unit 21, for example, formed by a coaxial cable. It is said that

FIG. 3 is a scope of claims of the present application in which another example of the data transmission method according to the invention described in any one of claims 4 to 6 in the scope of claims of the present application is implemented. Another example of the data transmission device according to any one of claims 1 to 3 in FIG.

In FIG. 3, the blocks, data and signals corresponding to the blocks, data and signals shown in FIG. 1 are shown with the same reference numerals as in FIG.
A duplicate description of them will be omitted.

The example shown in FIG. 3 is similar to the example shown in FIG. 1 except that the data compression section 13A and the data input terminal 12A are used.
Between the memory section 14A and the memory section 15A, the data compression section 13B, the data input terminal 12B and the memory section 14B.
And the memory unit 15B, the data compression unit 13C, the data input terminal 12C, the memory unit 14C, and the memory unit 15
Between the data compression unit 13J and the data input terminal 12J and the memory unit 14J and the memory unit 15J, an encoder unit 22A and a data transmission line 23 are provided.
A set of A and decoder section 24A, a set of encoder section 22B, data transmission line 23B and decoder section 24B, a set of encoder section 22C, data transmission line 23C and decoder section 24C, ..., encoder section 22J And a data transmission path 23J and a decoder section 24J.

The encoder section 22A includes a data compression section 1
Compressed DV data DX1 from 3A and data input terminal 1
DA data DA1 from 2A is supplied. In the encoder section 22A, as shown in FIG. 4, one frame period of each video signal in the DA data DA1 is numbered 20th to 262th in a data division group consisting of 525 data divisions DP that are successively arranged. Up to 24
The ancillary area portion following the EAV portion, which is the timing reference code data portion, in each of the three data sections DP, and 2 from the 283rd to 525th
The compressed DV data DX is stored in the ancillary area portion following the EAV portion which is the timing reference code data portion in each of the 43 data sections DP.
48 data sections D starting from the 20th of the data section group consisting of 525 data sections DP successively connected for one frame period of each video signal in 1
The compressed DV data DX1 and DA data DA1 stored in the payload area portion following the SAV portion, which is the timing reference code data portion, of each P are formatted according to the SDI format. Then, the composite data DZ1 according to the SDI format is transmitted from the encoder unit 22A.

Similarly, the encoder sections 22B, 22C, ...
.., 22J are compressed DV data DX2 from the data compression unit 13B, DA data DA2 from the data input terminal 12B, and compressed D from the data compression unit 13C, respectively.
DA data DA3 from the V data DX3 and the data input terminal 12C, ..., Compressed DV data DX10 from the data compression unit 13J and DA data DA10 from the data input terminal 12J are supplied. Then, in the encoder units 22B, 22C, ..., 22J, compressed DV data DX2 and DA data DA2, compressed DV data DX3 and DA data DA3 ,.
The compressed DV data DX10 and DA data DA10 are formatted according to the SDI format, and the encoder units 22B, 22C ,.
From the composite data DZ2 according to the SDI format
DZ3, ..., DZ10 are transmitted respectively.

The composite data DZ1 to DZ10 sent from the encoder units 22A to 22J are respectively transmitted to the data transmission line 2.
3A, 23B, 23C, ..., 23J, and decoder units 24A, 24B, 24C ,.
・, 24J will be supplied. In the decoder section 24A, the decompression process is performed on the composite data DZ1 transmitted through the data transmission path 23A, and the compressed DV data DX1 and the DA data DA1 are obtained in a separated state.

Similarly, in each of the decoder units 24B to 24J, the de-formatting process is performed on each of the composite data DZ2 to the composite data DZ10 transmitted via the data transmission path 23B. , Compressed DV data DX2 and DA data DA2 to compressed DV data DX10 and DA data DA
Each of the 10 is obtained in isolation from each other. Then, the compressed DV data DX1 to DX10 obtained from the decoder units 24A to 24J are supplied to the memory units 14A to 14J, respectively. Further, DA data DA1 to DA10 obtained from the decoder units 24A to 24J are stored in the memory unit 15A.
To 15J respectively.

In the memory units 14A to 14J, writing and reading of the compressed DV data DX1 to DX10 are performed in the same manner as in the example shown in FIG. 1, and the compressed DV data DX1 is read from the memory units 14A to 14J. Of 1
440 words worth of DXD1 to 1 of compressed DV data DX10
The DXD 10 of 440 words is read out and supplied to the encoder unit 21. In addition, the memory units 15A to 15A
In J, writing and reading of each of the DA data DA1 to DA10 are performed in the same manner as in the example shown in FIG. 1, and 268 words of the DA data DA1 are read from the memory units 15A to 15J. DA1
268 words of DAD 10 of 0 are read out and supplied to the encoder unit 21.

Further, in the encoder section 21, 1440 words worth DXD1 to 1440 words DXD10 of the compressed DV data DX1 sequentially read from the memory sections 14A to 14J and 1440 words worth DXD10 from the memory sections 15A to 15J are sequentially read. DA data DA
1 268 words worth of DAD1 to DA data DA10 of 2
A 68-word DAD 10 sequentially includes a payload area portion and a timing reference code data portion EAV portion following a SAV portion which is a timing reference code data portion in a data section DP according to the SDI format as shown in FIG. Formatting that is stored in the ancillary area portion that follows is performed in the same manner as in the example shown in FIG. As a result, the encoder unit 21
Therefore, any one of 1440 words DXD1 to 1440 words DXD10 of compressed DV data DX10 is stored in the payload area portion, and 2 bytes of DA data DA1 is stored in the ancillary area portion.
Data division D in which one of 68 words DAD1 to DA data DA10 of 268 words is stored
A data partition group consisting of 525 data partitions DP including P is sequentially obtained to form multiplexed video and audio data DSD.

In this way, the multiplexed video and audio data DSD sent from the encoder unit 21 is also 10
, Which represents a video signal and an audio signal forming a television broadcasting signal conforming to the NTSC standard
The set of the V data DV1 and the DA data DA1 to the set of the DV data DV10 and the DA data DA10 is the DV data D
V1 to DV10 are respectively compressed DV data DX1 to DX10
Therefore, it is included in the encoder section 2
It is assumed that the data is transmitted through one transmission line formed by, for example, a coaxial cable, which is connected to one output end.

In each of the above examples, 10 sets of DV data and D representing the video signal and the audio signal each forming the television broadcasting signal conforming to the NTSC system are provided.
According to claim 1 of the present application, a process for forming data that can be transmitted through one transmission line formed by, for example, a coaxial cable is performed based on the A data. To the data transmission device according to the invention described in any one of claims 3 to 3, or claim 4 in the claims of the present application.
In the data transmission method according to any one of claims 1 to 6, no limitation is imposed on the number of pairs of DV data and DA data, and the number of pairs of DV data and DA data is DV. It can be appropriately set in consideration of the data compression processing for the data.

[0056]

As is apparent from the above description, the data transmission device according to the invention described in any one of claims 1 to 3 of the claims of the present application, or the claims of the present application In the data transmission method according to the invention described in any one of claims 4 to 6, each of a series of data sections formed for transmission of a set of compressed DV data and DA data. However, each set of compressed DV data and DA data is stored in the payload area part and the ancillary area part, respectively. For example, a data group is formed by a series of data partitions including a predetermined number of data partitions. , A plurality of compressed DVs each representing a plurality of video signals in the payload area part of each of a predetermined number of data sections included in each data group Together over data is stored is divided, the ancillary area portion in each of a predetermined number of data segments in each data group, a plurality of compression D
A plurality of DA data corresponding to V data are divided and stored.

Each data section corresponds to, for example, one line period of the video signal, and, for example, the number of data sections included in each data group forms one frame period in the video signal. It corresponds to the number of line periods, and in each of the predetermined number of data sections, a plurality of compressed DV data representing one frame period of each of a plurality of video signals are divided in the payload area portion. While being stored, a plurality of DA data corresponding to one frame period of each video signal is divided and stored in the ancillary area portion.

Therefore, a plurality of sets of compressed DV data and a plurality of DA data are sequentially stored, for example, in a data group constituted by a predetermined number of series of data divisions by a data amount corresponding to one frame period of a video signal. Will be done. The data group configured in this manner can be sequentially transmitted through, for example, one transmission path formed by a coaxial cable, and therefore, a plurality of sets of compressed DV data and DA data are substantially formed. At the same time or within a common transmission period, a state of being transmitted to a common destination can be obtained.

Therefore, the data transmission device according to the invention described in any one of claims 1 to 3 in the claims of the present application, or claims 4 to 4 in the claims of the present application According to the data transmission method according to the invention described in any one of 6 to 6, it is assumed that a plurality of sets of compressed DV data and DA data comply with a data format such as an SDI format, substantially simultaneously or in common. During transmission to a common destination within a transmission period, a plurality of sets of compressed DV data and D
It is not necessary to provide a plurality of data transmission paths corresponding to the number of sets of compressed DV data and DA data for the transmission of the set of A data, and therefore the configuration becomes complicated and the scale becomes large. It is possible to avoid the situation of imitation, and further reduce the cost for data transmission.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of a data transmission method according to the invention described in any one of claims 4 to 6 in which the claims of the present application are implemented; FIG. 9 is a block configuration diagram showing an example of a data transmission device according to the invention described in any one of claims 3 to 4.

FIG. 2 is a conceptual diagram provided for explaining a data division group formed in the example shown in FIG.

FIG. 3 is a claim of the present application, in which another example of the data transmission method according to the invention described in any one of claims 4 to 6 of the present application is implemented. FIG. 6 is a block configuration diagram showing another example of the data transmission device according to the invention described in any one of claims 1 to 3.

FIG. 4 is a conceptual diagram provided for explaining data formatting performed in the example shown in FIG.

FIG. 5 is a conceptual diagram used for explaining data division according to the SDI format.

FIG. 6 is a conceptual diagram provided for explaining a data division group according to the SDI format.

[Explanation of symbols]

11A to 11J, 12A to 12J ... Data input terminal, 13A to 13J ... Data compression section, 14A to
14J, 15A to 15J ... Memory unit, 20 ...
Memory control signal forming unit, 21, 22A to 22J ...
Encoder part, 23A-23J ... Data transmission path,
24A to 24J ... Decoder section

Claims (6)

(57) [Claims] 1. A memory means in which data including a plurality of sets of compressed video data and audio data is written, a control means for controlling a timing of reading data from the memory means, and a control by the control means. Form a series of data divisions in which the data read from the memory means is divided and stored according to a predetermined format, and a data group constituted by the series of data divisions is formed into one transmission line. Encoding means for transmitting to be transmitted through the first timing reference code data portion and at least audio data following the first timing reference code data portion. Is stored in the ancillary area portion, a second timing reference code data portion, and a second timing reference code data portion. A plurality of compressed video data are stored in a series of payload area parts included in the series of data divisions, respectively. At the same time, a plurality of audio data are stored in a series of ancillary area portions included in the series of data divisions, respectively. 2. The data transmission device according to claim 1, wherein the series of data divisions are in accordance with a serial data interface format. 3. A series of data partitions, each of which is a video signal.
The data transmission device according to claim 1, wherein the data transmission device corresponds to a line period. 4. A plurality of sets of compressed video data and audio data are written in a memory means, and the plurality of sets of compressed video data and audio data are read from the memory means for each set, and the memory means is provided. A series of data sections in which the sets of the compressed video data and audio data read out from are sequentially stored are formed in accordance with a predetermined format, and a data group formed by the series of data sections is formed as one data group. Each of the series of data divisions comprises a first timing reference code data portion, and at least audio data following the first timing reference code data portion is stored. Ancillary area portion, a second timing reference code data portion, and a second timing reference code data portion. And a payload area portion in which at least compressed video data is stored following the ming reference code data portion, and the payload area portion and the ancillary area portion included in each of the series of data divisions have the above-mentioned set. A data transmission method, characterized in that compressed video data and audio data that form 5. The data transmission method according to claim 4, wherein the series of data divisions is in accordance with a serial data interface format. 6. A series of data sections, each of which is a video signal.
The data transmission method according to claim 4, wherein the line transmission period corresponds to the line period.