JP2001268542A - Distribution system, transmission system and receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an Internet technology using an extrahigh speed network capable of removing a asynchronous state between an image and a sound. SOLUTION: In the distribution system for distributing non-compressed digital video data and digital sound data, the transmitting side generates real data adopting a non-compressed D1 image for one picture (one field or one frame) and digital sound data obtained by dividing AES/EBU sound data for one picture into plural frames as one data unit and transmits the real data. The receiving side receives the real data and reproduces the digital video data for one picture unit and the digital sound data of plural frames for one picture from the real data, generates output control data for outputting the digital video data to a monitor, adds the generated data to the video data and reproduces the video data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to communication technology.
In particular, it relates to an Internet technology using an ultra-high-speed network.

[0002]

2. Description of the Related Art Internet-related technologies are developing rapidly. The conventional Internet is mostly used for accessing information existing on the Internet, has a narrow band, and is still insufficient for high-speed communication of large amounts of data. In particular, the communication / broadcasting fusion technology has a huge amount of data to be transmitted and received, and it is difficult to commercialize the technology with the current Internet technology.

[0003]

Further, the present VOD
The (Video On Demand) system uses compressed digital video and audio (MJPEG, MPEG) and the like. These images are general-level images, not business-level high-quality images.

As for transmission and reception of uncompressed digital images, Japanese Patent Application Laid-Open No. H11-331155 discloses a means for transmitting and receiving digital images and voices using QoS in ATM. However, in such a method, when a collision (collision) between packets occurs during transmission of an IP packet, or when a data packet is retransmitted due to a network failure during transmission of the IP packet, the synchronization deviation between video and audio is added. And it is not suitable for practical use.

The present invention has been made in view of the above situation, and has as its object to provide a technique for distributing a large amount of data. Another object of the present invention is to provide an Internet technology using an ultra-high-speed network capable of eliminating a synchronization shift between an image and a sound. It is another object of the present invention to provide a technology for integrating communication and broadcasting via the Internet.

[0006]

In order to achieve the above object, a distribution system according to a first aspect of the present invention is a distribution system that distributes uncompressed digital video data and digital audio data, and includes a predetermined screen. Transmission data generating means for generating transmission target actual data in a plurality of data units, each of which includes digital video data for one minute and digital audio data divided into a plurality of frames by the predetermined screen, and the transmission target actual data Transmitting means for transmitting the actual data transmitted by the transmitting means, digital video data of a predetermined screen unit from the real data received by the receiving means, and And a reproducing means for reproducing and outputting digital audio data of a plurality of frames for a screen. And wherein the door.

[0007] According to this configuration, the digital video data and the digital audio data are incorporated into the same data for data transfer. Therefore, it is possible to realize stable network transfer in which synchronization between video and audio is not deviated due to data transmission delay due to collision or the like occurring on the Internet or data drop due to network failure.

[0008] The transmission data generating means includes, for example, transmission target real data in a plurality of data units, each of which includes one screen of digital video data and one frame of digital audio data divided into a plurality of frames. Is provided.

The reproducing means reproduces digital video data of one screen unit and digital audio data of a plurality of frames for one screen from the actual data received by the receiving means, and further outputs the digital video data. Means for generating output control data for adding to the video data. According to this configuration, the reproduction means adds the output control data necessary for display to the actual data. Therefore, there is no need to send and receive output control data,
The traffic can be reduced.

The digital video data for one screen is, for example, digital video data for one frame or one field.

The digital video data is, for example, uncompressed D1 data or HDTV (High Definition
levision) uncompressed data.

The data unit of the actual data includes digital video data for one screen, digital audio data divided into a plurality of frames for one screen, and padding data. The padding data is set to an amount such that the sum of the amount of the padding data, the amount of the digital video data, and the amount of the digital audio data becomes the least common multiple of the block size in the data storage structure in the transmitting system. It is desirable. This enables high-speed access.

The padding data is valid in the disk device and does not need to be actually transmitted. Therefore,
Means for discarding the padding data so as not to be output may be arranged.

For example, the transmission data generating means generates attribute information indicating characteristics and format of the transmission data,
The file name, the attribute information, and the actual data are stored in association with each other, and the reproducing system requests the transmitting system to transmit data, and the transmitting system responds to the request. Transmitting a list of file names and a list of attribute information to the playback side system, and the playback side system notifies the transmission side system by specifying an arbitrary file name from the received list of file names. The reproducing system sets the receiving characteristic based on the attribute information corresponding to the selected file name, and the transmitting system sets the transmitting characteristic based on the attribute information corresponding to the notified file name. Set.

According to this configuration, the transmitting system transmits a list of file names and a list of attribute information to the reproducing system, and the transmitting system and the reproducing system communicate with each other.
Transmission characteristics and reception characteristics are set based on attribute information corresponding to the selected file name. Therefore, the setting operation can be performed at high speed.

Further, a transmission system according to a second aspect of the present invention is a transmission system for transmitting digital video data and digital audio data, and comprises a predetermined screen of digital video data and a plurality of frames of the predetermined screen. Transmission data generating means for generating transmission target actual data in a plurality of data units, each of which has the digital audio data divided as a single data unit; and transmission means for transmitting the transmission target actual data. I do.

The transmission data generating means generates transmission target actual data in a plurality of data units, each of which includes one screen of digital video data and one frame of digital audio data divided into a plurality of frames. Means may be provided.

The digital video data is, for example, uncompressed D1 data or HDTV (High Definition Televis).
ion) -specific uncompressed data.

The data unit of the actual data includes digital video data for one screen, digital audio data divided into a plurality of frames for one screen, and padding data. The padding data is set to an amount such that, for example, the sum of the amount of digital video data, the amount of digital audio data, and the amount of padding data becomes the least common multiple of the block size in the data storage structure in the transmitting system. You.

[0020] The transmitting means may include means for discarding the padding data so as not to be output. The transmission data generation unit generates attribute information indicating characteristics and format of transmission data, stores a file name, the attribute information, and the actual data in association with each other, and the transmission unit generates a request from a receiving system. , A list of file names and a list of attribute information are transmitted, and transmission characteristics are set and transmitted based on the attribute information corresponding to the notified file name.

A receiving system according to a third aspect of the present invention is a receiving system for receiving digital video data and digital audio data, the digital video data for a predetermined screen and a plurality of frames for the predetermined screen. Receiving means for receiving real data in a plurality of data units in which digital audio data divided into a single data unit is provided; digital video data in a predetermined screen unit from the real data received by the receiving means; Reproducing means for reproducing and outputting the digital audio data of a plurality of frames.

The reproducing means reproduces digital video data of one screen unit and digital audio data of a plurality of frames for one screen from the actual data received by the receiving means, and further outputs the digital video data. Means for generating output control data for adding to the video data.

A recording medium according to a fourth aspect of the present invention is a transmission system for transmitting digital video data and digital audio data to a computer, comprising: a predetermined screen of digital video data; Transmission data generating means for generating transmission target actual data in a plurality of data units, in which digital audio data divided into a plurality of frames is used as one data unit, and transmission means for transmitting the transmission target actual data. Recording the program.

A recording medium according to a fifth aspect of the present invention is a receiving system for receiving digital video data and digital audio data by a computer, comprising: a digital video data for a predetermined screen; Receiving means for receiving real data in a plurality of data units, in which the digital audio data divided into a plurality of frames is one data unit, and digital video data in a predetermined screen unit from the real data received by the receiving means. A program for functioning as a reproducing means for reproducing and outputting a plurality of frames of digital audio data for a screen is recorded.

Further, a recording medium according to a sixth aspect of the present invention is a recording medium to which data is accessed in units of blocks, and includes format information indicating the type and characteristics of the data;
The padding data includes data including a plurality of data units, each of which includes video data for one screen and audio data divided into a plurality of frames for one screen, and padding data. It is characterized in that data having a data structure having a size such that the sum of the data is the least common multiple of the block size of the recording medium is recorded.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION A video-on-demand (Video On Demand) system according to an embodiment of the present invention capable of distributing uncompressed D1 video and audio over the Internet in a video-on-demand format. Will be described.

FIG. 1 shows a system configuration of a video-on-demand system according to a first embodiment of the present invention. 1, the video-on-demand system includes a distribution server 11, a storage server (distribution data creation server) 12, a client 13, a Giga-bit Neighbor
twork (gigabit network) 14. Distribution server 11, storage server 12, and client 1
3 is a high-speed interface (I / F) 15, 16, 1
It is connected to a Giga-bit Network (Giga-bit Network) 14 via.

As shown in FIG. 2, the distribution server 11 stores a plurality of pairs (one pair in the figure) of server devices 111A and 111B (referred to as 111 in general) so that the data can be distributed while being stored. And a plurality of large-capacity storage devices 11
2 is provided.

Each large-capacity storage device 112 is composed of a large-capacity disk array or the like. This large capacity disk array stores a variety of formats of audiovisual (AV) data, and is a RAID (Redundant Arrangement) that minimizes the performance degradation due to the block size.
rays of Independent Disks) Disk arrays are preferred. Also, D1 (IT) having a transfer rate of 270 Mbps
In order to handle a digital component signal based on the UR 601 (CCIR 601) standard or a broadcasting digital video specification based on the ITU-R 601 (CCIR 601) standard, an OC-12 (OC-x: Optical Carrier) is used. 'n' (OC-
n); Optical communication carrier 'n'; ITU-TSS physical standard created for optical fibers used in transmission systems. OC-12 is 6
A high-speed network interface of 22.08 Mbps or more is required.

Each of the server devices 111A and 111B has a high-speed network interface and a daemon process. The daemon process includes a management daemon for managing QoS and a distribution daemon for executing transfer and accumulation. The management daemon manages the distribution daemon to deal with the error and QoS display functions. It also generates management data such as an access log and an operation log. The distribution daemon is a process for providing information and distributing AV data to the client 13 and the storage server 12.

The distribution server 11 is a large-scale system.
For this reason, Giga-bit Network 1
4) A plurality of high-definition moving images and audios of a plurality of streams are simultaneously distributed.

The storage server 12 includes a server device 121 and a high-speed disk system 122, as shown in FIG. 3, in order to store and distribute images from a video deck (may be a camera or the like) in real time. And D1
A tape deck 123, a monitor device 124 for D1,
A V tape deck 125 and a DV monitor device 126 are provided.

The high-speed disk system 122 has substantially the same configuration as the large-capacity storage device 112 of the distribution server 11. The D1 tape deck 123 plays a D1 specification tape. The D1 monitor device 124 is a monitor device that displays a reproduction signal of the D1 tape deck 123. DV
The tape deck 125 reproduces a DV specification tape. D
The V monitor device 126 is a monitor device that displays a reproduction signal of the DV tape deck 125.

The server device 121 is composed of a management daemon, a distribution daemon, a data storage daemon and software, and data editing software so that images can be stored and distributed. The management daemon and the distribution daemon perform the same functions as those of the distribution server 11. The data storage daemon is a process for writing data from the input interface 16 to the high-speed disk system 122 composed of a RAID disk or the like. The data storage software is VCRs 123 and 125
Is software that can perform video control using a time code in order to store AV data. The data editing software is software for updating and adding information of an AV header portion of accumulated AV data. Since the storage server 12 is an input system, it is arranged at a place where an input is required. Since the basic performance is accumulation,
The distribution is one stream.

The client 13 is a system for requesting, reproducing, and displaying AV data. As shown in FIG. 4, a client device 131 and a D1 monitor device 13 are provided.
2 and a DV monitor 133. D1
Monitor device 132 is a monitor device that displays the received D1 data. The DV monitor 133 is a monitor that displays DV data.

The client device 131 is composed of an AV data output interface, a reception daemon, and server access software having a user interface for reproducing AV data and acquiring information on AV data from the server. ing. The AV data output interface is an interface for converting (decoding if necessary) AV data in accordance with the format of the received AV data and outputting the converted AV data. The receiving daemon is A
This is a process for receiving V data. The server access software is software for inputting a video title selection, a reproduction / stop instruction, and the like.

Next, the data format defined in this embodiment will be described. Giga-bit Network1
In order to transfer the synchronized digital moving image and audio from the high-speed disk using the Internet Protocol (IP), the data format shown in FIG. 5 is adopted in this embodiment. This data format is composed of an AV header, and n pieces of multi-AV data, which are a set of video data, digitized audio data, and padding data.

The AV header stores information (characteristic information) on the AV data such as the format, title, and access right of the AV data.

Specifically, the AV header has an AV data type, a block size of a distribution disk, a video rate, a size of multi-dia data, a video format, a video timing, a video dominance, a video packing, a video color space, and a video capture type. , Video bit rate, video pixel size, video image size (width),
Video image size (height), video transfer size, audio frame rate, audio sample format,
It consists of the number of audio channels, audio sample rate, audio frame size, audio data reserve size, and reserved area.

(1) The AV data type is multi-A
Indicates the type of V data, for example, 8 bits of D1, D
V and D1 indicate 10 bits.

(2) The block size of the distribution disk indicates a size corresponding to the disk block of the stored data, and is set to, for example, 4096 kbytes.

(3) The VL_RATE parameter used in the SGI VL library is set as the video rate. This value represents the number of display frames or display fields displayed per second. For example, VL_CAP_TY
PE = VL_CAPTURE_NOINTERLEVE
D, when VL_RATE = 60, 60 fields / second in the interlace setting.

(4) The multimedia data size indicates the capacity size (1 unit) of the multi AV data.
For example, it is set to 352256 bytes.

(5) The video format is SGI V
The VL_FORMAT parameter used in the L library is set. This value indicates the video input / output format of the video signal of the video option of SGI. For example, VL_FORMAT = VL_FORMAT_DIG
If ITAL_COMPONENT = SERIAL,
D1 component serial signal (SMPTE259M
Indicates compliance).

(6) The video timing is the SGI VL
VL_TIMING used in the VL library
The parameters are set. This value indicates the video input / output timing of the video option of the SGI. For example, VL_
TIMING = VL_TIMING_525_CCIR
In the case of 601, D1 NTSC (National TelevisionS
Input / output at the timing of ystem commit).

(7) The video dominance is the SGI VL
VL_FIELD_ used in the VL library
The DOMINANCE parameter is set. This value is VL_CAP used in the SGI VL library.
Used with _TYPE. This value indicates the dominance of the field or frame. For example, VL_CA
P_TYPE = VL_CAPTURE_NOINTER
LEVEL, VL_FIELD_DOMINANCE =
In the case of VL_FIELD_DOMINANCE, the start field is set to the F1 field in the interlace setting.

(8) The video packing is performed using the SGI VL
VL_PACKIN used in the VL library
The G parameter is set. This value sets a format for packing the video signal of the SGI video controller into digital data. For example, VL_PACKKI
If NG = VL_PACKING_YVYU_422_8, the 32-bit word "UUUUUUUYYYYY"
YYYVVVVVVVYYYYYYYY ".

(9) The video color space is VL_COLORSP used in the SGI VL library.
ACE parameters are set. This value changes the video signal of the SGI video controller to the specified color space. For example, VL_COLORSPACE = VL_
In the case of COLORSPACE_CCIR601, ITU
-RBT. 601-5.

(10) The video capture type is S
VL_CAP_ used in GI VL library
The TYPE parameter is set. This value changes the input / output capture type of the video signal of the SGI video controller. For example, VL_CAP_TYPE = VL
In the case of _CAPTURE_NOINTERLEAVED, interlace is set.

(11) Video bit rate Indicates the display resolution of uncompressed D1 video. (12) Video pixel size Indicates the capacity of video data per pixel. For example,
2 (bytes) is set.

(13) Video image size (width) Indicates the number of pixels in the field or frame width of video data. For example, it is set to 720 (pixel). (14) Video image size (height) Indicates the number of lines (height) of the field or frame width of video data. For example, it is set to 243 (lines).

(15) Video transfer size Indicates the data capacity of the video data portion. Actual capacity is "picture pixel size" x "picture image size (width)" x "
Video image size (height) ". For example, it is set to 239920 (bytes).

(16) Audio Frame Rate Indicates the sampling rate of audio data. For example, 48
000 (Hertz). (17) Audio Sample Format The SGI AL library uses a linear pulse code modulation (PCM) digital data format to represent digital audio samples. The audio sample format indicates this sample format. For example, it is set to 24 (bits).

(18) Number of audio channels Indicates the number of audio input / output channels. For example, it is set to 2 (channel).

(19) Audio sample rate Indicates the accuracy of a full-scale range of an audio signal that can be sampled. For example, it is set to 24 (bits).

(20) Audio frame size Indicates the capacity per audio frame. (21) Audio data reserve size Indicates the maximum number of audio frames that can be collected within one field or one frame unit time. (22) Reserve area This is an additional area for user parameters.

Each of the multi AV data shown in FIG. 5 has one frame or one field (one screen) of A data.
It stores V data, and is composed of an AV data number, video data, the number of audio frames, audio frame data, and padding data. The AV data number is a serial number of the multi AV data.
The video data stores video data for one field or one frame to be transferred. The audio frame data stores the number of audio frames. The audio frame data stores audio data for one frame. Padding data is
This is data for adjusting the data size to the least common multiple of the disk block size.

Note that the format shown in FIG.
In the case of other forts, various video formats can be handled by setting another parameter value in the AV header.

(Operation) (1) First, a procedure for creating and storing data for distribution will be described. The storage server 12 appropriately stores the images and sounds stored on the D1 video tape or the DV tape into the D1 video tape or the DV tape.
The image data and the audio data are obtained by reproduction on the tape deck 123 and the DV tape deck 125. The server device 121 converts the created data into a multi AV
Generate format data. The AV data type and the like of the AV header are determined by the type of reproduced data. The size of the padding data is selected so that the size of one multi-AV data is the least common multiple of the size of the data block of the large-capacity storage device 112 provided in the storage server 12 or the distribution server 11.

The file name of the multi-AV data is set by an operator or the like via a GUI before reproduction, for example. Further, the data is stored in a format in an expanded state without being compressed.

The storage server 12 stores the multi-AV data in its own high-speed disk system 122 and transmits it to the distribution server 11. The distribution server 11 receives the multi-AV data from the storage server 12 and stores the data in one of the large-capacity storage devices 112. Since the server devices 111A and 111B are provided, data can be received even when the distribution server 11 is transmitting data.

The uncompressed D1 video data is composed of a signal used for controlling output timing at the time of video output based on the D1 control area data and actual video data based on the D1 active area data. The control area data is data necessary for outputting an uncompressed D1 video as a video, and the data in each field is basically the same data. When the data is transferred over the network as computer data, the D1 control area data is not necessary for the above reason, and only the D1 active data shown in FIG.
2 is stored.

(2) Next, the operation of the client 13 requesting the distribution server 11 to transmit multi-AV data, receiving the distribution, and reproducing the AV data will be described with reference to FIG. Client device 131 of client 13
Requests the distribution server 11 for a list of file names (TOC) of multi-AV data that can be distributed and a list of AV header information (step S11).

In response to this request, distribution server 11
The distribution data file name and the AV header information are transmitted to the client 13 (step S21). Client 13
Displays a list of received distribution data file names on a screen, for example, and the user selects a file name of the AV data to be reproduced via the GUI (step S1).
2). The client device 131 transmits the selected file name to the distribution server 11 (Step S13).

The distribution server 11 sets optimum values for disk transfer and network transfer from the AV header of the selected file (step S22). On the other hand, the client 13 sets the optimum value for network transfer, the set value for receiving video data and the set value for receiving audio data from the AV header information received in advance corresponding to the selected file name. (Step S14). The client 13 starts preparation for reception, and makes a transmission request for distribution data to the distribution server 11 (step S15).

The distribution server 11 receives the transmission request (step S23), and starts transmitting distribution data to the client 13 (step S24). Distribution server 1
The first server device 111A or 11B discards the padding data from the multi-AV data stored in the large-capacity storage device 112, extracts only the remaining portion (active data), and places it on the Giga-bit Network 14. Send out. That is, the padding data is added to increase the size of the multi-AV data to an integral multiple of the blocking size of the disc in order to access the disc at a high speed, and it is necessary to output the padding data to the Giga-bit Network 14. There is no. Therefore, the server device 111A or 11B discards the padding data from the multi-AV data read from the large-capacity storage device 112 into the internal memory and extracts only the remaining portion (the portion shown in FIG. 5).
Send it out on the Giga-bit Network 14. As described above, the D1 output control data is not transmitted.

When the transmission of the distribution data is started, the distribution server 11 is locked so as not to accept a communication request other than the transmission of the currently transmitted multi-AV data (step S25). When the transmission is completed, the lock is released. The client 13 receives the data from the distribution server 11, temporarily accumulates the data in a large-capacity buffer device (not shown), reproduces / outputs the data, and displays it on a monitor (step S16).

The large-capacity buffer device is composed of a ring buffer and the like. The received data is put into this buffer, and is read out by a FIFO (first-in first-out) method, thereby absorbing transmission time variations and the like to provide a stable display. Becomes possible.

Further, in order to reproduce uncompressed D1 format data, control frame data for adding a control frame is originally required. However, in this embodiment, only the actual data is transmitted to the client 13. The client device 131 generates a control frame, adds the control frame to the video data read from the buffer device, and supplies it to the D1 monitor 132. Monitor 13 for D1
2 reproduces and displays the video data from the control frame and the video data.

Upon completion of data reception, the client 13 requests the distribution server 11 to close the connection. The distribution server 11 and the client 13 execute a connection closing process, and subsequently execute a termination process.

As described above, according to this embodiment,
When the client refers to the content data from the client, the AV header information is also passed. The server and the client can determine the optimum network transfer block size and the like from the AV header information, and perform high-speed and stable data transfer.

Further, according to this embodiment, padding data is added for speeding up data transfer from the distribution data storage disk of the server system to the memory. The disk can be accessed at a high speed if input / output is performed for each disk block size. The data size of the data to which padding data is added is larger, but the actual transfer speed is higher than the case where padding data is not set. The data size including the padding data size is set to be the least common divisor of “padding data + video frame ｛or field size｝ + audio data size” and “disk block size”.

According to this embodiment, active data of D1 uncompressed data is transferred. D1 uncompressed video is
It consists of two types, a normal control frame and an active frame. The control frame is a control frame for setting a timing when displaying an image. This control frame has the same data in every frame in the portion where the display timing is taken. Therefore, in order to reduce the transfer load at the time of data transfer by network communication, the control frame data is removed at the time of accumulating the server delivery data, only the active frame is stored, and only the active frame data is delivered to the client 13. Then, a video image can be displayed by adding a control frame in the client 13. This reduces the transfer data size by 20%
It can be made smaller.

According to this embodiment, data transfer is performed by incorporating video and audio into the same data. Therefore, Giga
It is possible to realize stable network transfer in which synchronization between video and audio is not deviated due to data transmission delay due to collision or the like occurring on the -bit Network 14 or data drop due to network failure.

In the above embodiment, a system for distributing data on one transmission line using a broadband network interface has been described. However, if a wideband network interface cannot be prepared, a plurality of narrowband network interfaces are used. The present invention can also be provided by dividing data and distributing it.

The uncompressed D1 video and AES / EBU audio data are stored for each frame (or field).
To synchronize each data, unadjust
Synchronization for each frame is achieved by the user time function. Further, even when synchronization is lost, correction within one frame (or field) is possible.

The present invention is not limited to the above embodiment, and various modifications and applications are possible. For example,
In the above embodiment, D1 data is shown as uncompressed digital video data. However, the present invention can be similarly applied to, for example, HDTV uncompressed digital video data.

The present invention is not limited to the Internet, but can be applied to data distribution using various protocols.

[0079]

As described above, according to the present invention,
Video data can be appropriately distributed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a distribution system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a distribution server.

FIG. 3 is a diagram showing a configuration of a storage server.

FIG. 4 is a diagram showing a configuration of a client.

FIG. 5 is a diagram illustrating a data format.

FIG. 6 is a flowchart illustrating an operation in which a client requests a distribution server to transmit multi-AV data, receives the distribution, and reproduces the AV data.

[Explanation of symbols]

11 Delivery server 12 Storage server 13 Client 14 Ultra high-speed network or Giga-bit Network
(Gigabit network)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Harada 5-3-6 Akasaka, Minato-ku, Tokyo Tokyo Electron Limited F-term (reference) 5C063 AA11 AB03 AB09 DA01 DA05 DA13 5C064 BC10 BC18 BC20 BC23 BC25 BD01 BD03 BD07 EA03

Claims (19)

[Claims] 1. A distribution system for distributing uncompressed digital video data and digital audio data, wherein a digital video data for a predetermined screen and digital audio data divided into a plurality of frames by the predetermined screen are combined into one. A transmission-side system including transmission data generation means for generating transmission-target actual data in a plurality of data units, and transmission means for transmitting the transmission-target actual data; and transmitting the actual data transmitted by the transmission means. A reproducing unit comprising: receiving means for receiving; and reproducing means for reproducing and outputting digital video data of a predetermined screen unit and digital audio data of a plurality of frames for the predetermined screen from the actual data received by the receiving means. A distribution system, comprising: 2. The transmission data generating means includes: a plurality of data units of transmission target real data in which digital video data for one screen and digital audio data divided into a plurality of frames for one screen are used as one data unit. The distribution system according to claim 1, further comprising: 3. The reproducing means reproduces digital video data of one screen unit and digital audio data of a plurality of frames for one screen from the actual data received by the receiving means, and further comprises the digital video data. 3. The distribution system according to claim 2, further comprising: a unit that generates output control data for outputting the video data and adds the generated output control data to the video data. 4. The digital video data for one screen includes one
The distribution system according to claim 2, wherein the distribution system is digital video data for a frame or one field. 5. The distribution system according to claim 1, wherein the digital video data is uncompressed D1 data or uncompressed data conforming to HDTV (High Definition Television) specifications. 6. The data unit of the actual data includes digital video data for one screen, digital audio data divided into a plurality of frames for one screen, and padding data. 3. The sum of an amount of digital video data and an amount of digital audio data is set to an amount that is a least common multiple of a block size in a data storage structure in the transmission side system. The distribution system described in 1. 7. The distribution system according to claim 6, wherein said transmitting means includes means for discarding padding data so as not to be output. 8. The transmission data generating means generates attribute information indicating a characteristic and a format of transmission data, stores a file name, the attribute information, and the actual data in association with each other. For the transmitting system,
Requesting transmission of data, the transmitting system transmits a list of file names and a list of attribute information to the reproducing system in response to the request, and the reproducing system transmits a list of received file names. From among them, an arbitrary file name is designated and notified to the transmission side system, the reproduction side system sets reception characteristics based on attribute information corresponding to the selected file name, and the transmission side system The distribution system according to any one of claims 1 to 7, wherein a transmission characteristic is set based on attribute information corresponding to the notified file name. 9. A transmission system for transmitting non-compressed digital video data and digital audio data, wherein one digital video data of a predetermined screen and the digital audio data divided into a plurality of frames by the predetermined screen are combined into one. A transmission system, comprising: transmission data generation means for generating transmission target actual data in a plurality of data units as data units; and transmission means for transmitting the transmission target actual data. 10. The transmission data generation means includes a plurality of data units of transmission target real data in which one screen includes digital video data for one screen and digital audio data divided into a plurality of frames for one screen. The transmission system according to claim 9, further comprising: means for generating 11. The transmission system according to claim 9, wherein the digital video data is uncompressed D1 data or uncompressed data conforming to HDTV (High Definition Television) specifications. 12. The data unit of the real data includes digital video data for one screen, digital audio data divided into a plurality of frames for one screen, and padding data, and the padding data is an amount of digital video data. 11. The sum of the amount of digital audio data and the amount of padding data is set to an amount that is the least common multiple of the block size in the data storage structure in the transmitting system. The transmission system according to 1. 13. The transmission system according to claim 12, wherein said transmission means includes means for discarding padding data so as not to be output. 14. The transmission data generating means generates attribute information indicating the characteristics and format of the transmission data, stores a file name, the attribute information, and the actual data in association with each other. A list of file names and a list of attribute information are transmitted in response to a request from the receiving system, and a transmission characteristic is set and transmitted based on the attribute information corresponding to the file name notified from the receiving system. The transmission system according to any one of claims 9 to 13, wherein: 15. A receiving system for receiving digital video data and digital audio data, wherein the digital video data for a predetermined screen and the digital audio data divided into a plurality of frames by the predetermined screen are formed in one data unit. Receiving means for receiving real data in a plurality of data units, and reproducing and outputting digital video data in a predetermined screen unit and digital audio data in a plurality of frames for the predetermined screen from the real data received by the receiving means A receiving system comprising: 16. The reproduction means reproduces digital video data of one screen unit and digital audio data of a plurality of frames for one screen from the actual data received by the reception means, and further reproduces the digital video data. The receiving system according to claim 15, further comprising: a unit configured to generate output control data for outputting the image data and add the generated output control data to video data. 17. A transmission system for transmitting uncompressed digital video data and digital audio data to a computer, comprising: a predetermined screen of digital video data; and a predetermined screen of digital audio data divided into a plurality of frames. A transmission data generation unit that generates transmission target actual data in a plurality of data units, each of which has one data unit; and a transmission unit that transmits the transmission target actual data. 18. A receiving system for receiving uncompressed digital video data and digital audio data by a computer, comprising: a predetermined screen of digital video data; and a plurality of frames of digital audio data divided by the predetermined screen. Receiving means for receiving real data in a plurality of data units each of which is one data unit, converting digital video data in a predetermined screen unit and digital audio data in a plurality of frames for the predetermined screen from the real data received by the receiving means. A computer-readable recording medium on which a program for functioning as a reproducing means for reproducing and outputting is recorded. 19. A recording medium to which data is accessed in block units, comprising format information indicating the type and characteristics of data, video data for one screen, and audio data divided into a plurality of frames for one screen. Is composed of data including a plurality of data units each of which is one data unit, and padding data, wherein the padding data is a sum of video data and audio data,
A computer-readable recording medium which records data having a data structure having a size that is a least common multiple of a block size of the recording medium.