JP2002077804A - Method and device for data transmission, method for reproducing data, method for recording data, and data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit subject matter data to which overlap width data are added so that the material data may be recorded and reproduced properly. SOLUTION: When the material data to which the added overlap width data are added and which are recorded in a storage section 30 are outputted, an overlap width deleting and extracting circuit 203 deletes the overlap width data and, at the same time, extracts the overlap width data added to the material data in the final frame and a data transmitting circuit 204 transmits the material data in an SDTI-CP format. The overlap width data transmitted in a separate frame. A data receiving circuit 206 supplies material data to which overlap width data must be added to an overlap width adding circuit 207 and the circuit 207 adds the data the next frame to the material data as the overlap width data. The extracted overlap width data are added to the material data in the final frame. Therefore, the material data with the overlap width data can be transmitted in a state where the overlap width data are not added to the material data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data transmission method, a data transmission device, a data reproduction method, a data recording method, and a data recording / reproduction device. More specifically, assuming that the SDTI-CP format is used for the transmission of the material data, the extra data added to the time-sequence material data is deleted and transmitted, and the extra data added to the material data of the last frame is transmitted. Extract and transmit in another frame. When material data is received, extra data is added to the material data using the data of the next frame, and the extracted extra data is added to the material data of the last frame.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for a recording / reproducing apparatus which can quickly reproduce desired video / audio data and simultaneously record or reproduce a plurality of video / audio data, or reproduce while recording. In order to satisfy this demand, a device called an AV (Audio and / or Video) server capable of recording and reproducing video / audio data and the like using a randomly accessible recording medium, for example, a disk using magnetism or light, has become widespread. It is getting.

In this AV server, video / audio data is recorded in units of one frame so that editing processing and the like can be easily performed. In addition, in the editing process, various processes are often performed. For example, the material A shown in FIG.
When the video data Vb and the audio data Ab of the material B shown in FIG. 10B are connected to the video data Va and the audio data Aa of FIG.
As shown in 0C, the video is switched from the video data Va of the material A to the video data Vb of the material B at the editing point in frame units. For audio, cross-fade processing is performed to prevent noise from occurring due to discontinuity of audio data at the editing point. In this cross-fade process, the material B to be newly reproduced while fading out by lowering the audio level of the material A being reproduced.
The audio is switched by increasing the audio level and performing fade-in. In the case of performing the cross-fade processing, if the audio data of the material A ends at the edit point together with the video data, the fade-out operation cannot be performed.
As shown in A, the audio data Aa of the material A is subjected to a fade-out operation using the extra data, assuming that the audio data of the next frame is added as extra data for a predetermined time.

[0004]

By the way, when transmitting material data to which margin data is added as described above, the data amount of audio data per frame is increased by the margin data. Therefore, devices that do not support the material data to which the margin data is added, such as video tape recorders, are determined to be abnormal because the data amount is larger than the frame unit, and the transmitted material data is transferred to the magnetic tape. For example, it may not be possible to properly record the audio data, or the data amount of the audio data may be larger than that of the extra data, which may cause a problem that the phase of the audio is delayed from the video at the time of reproduction.

Therefore, according to the present invention, a data transmission method and a data transmission apparatus, and a data reproduction method and a data recording method capable of transmitting material data to which margin data is added so that recording and reproduction can be performed correctly. A method and a data recording / reproducing apparatus are provided.

[0006]

According to the data transmission method of the present invention, each one-line section of a video frame includes an end synchronization code area, an auxiliary data area, a start synchronization code area, and data of a material item. And a payload area into which data of a system item having information on data of the material item is inserted, and a data transmission method for transmitting a transmission packet of a serial data transfer interface, the data of the material item being a frame. When the margin data is added to the unit material data, information indicating that the data of the material item is margin data is inserted into the payload area.

In the data transmission apparatus, each one-line section of a video frame is associated with an end synchronization code area, an auxiliary data area, a start synchronization code area, material item data, and material item data. A payload area into which data of a system item having information is inserted;
In the data transmission device that transmits the transmission packet of the serial data transfer interface composed of the following, when transmitting the margin data added to the material data in the frame unit as the material item data, the data of the material item is It has control means for inserting information indicating that it is marginal data into the payload area.

In the data reproducing method, chronologically-ordered material data is read out from a randomly accessible recording medium in an allocated processing period, and the read-out chronologically-ordered material data is added to frame-based material data. In addition to removing the extra data, the extra data added to the last frame of the chronological material data is extracted, and each one-line section of the video frame includes an end synchronization code area, an auxiliary data area, , The start synchronization code area and the material data in the order of time from which the extra data was deleted or the material item data having the extracted extra data, and the data of the system item having information on the data of the material item were inserted. Serial data transfer interface consisting of a payload area and And it generates a transmission packet over scan, and outputs the material data read from the recording medium.

In the data recording method, each line section of a video frame may include an end synchronization code area, an auxiliary data area, a start synchronization code area, and time-sequential material data from which marginal data has been deleted or extracted. Receiving a transmission packet of a serial data transfer interface composed of a material item data having margin data, and a payload area into which a system item data having information on the material item data is inserted, and A predetermined amount of data is added as margin data from the beginning of the material data of the next frame to the material data of the order, and the time-ordered material data to which the margin data is added can be randomly accessed in the allocated processing period. It is to be recorded on a recording medium.

[0010] The data recording / reproducing apparatus reads out material data in a time sequence recorded on the recording medium in the allocated processing period from the randomly accessible recording medium, or reads out time-series material data in the processing period allocated to the recording medium. In a data recording / reproducing apparatus that records chronological material data, from a chronological material data group read from a recording medium,
A margin deletion extraction means for deleting margin data added to the frame-based material data and extracting margin data added to the last frame of the time-ordered material data, and a section of each one line of the video frame. However, an end synchronization code area, an auxiliary data area, a start synchronization code area, and data of a material item having time-sequential material data from which margin data has been deleted or extracted margin data, or data of a material item. And a data transmission means for generating and transmitting a transmission packet of a serial data transfer interface composed of a payload area into which data of a system item having information on the system item is inserted. In addition, each one-line section of the video frame is composed of an end synchronization code area, an auxiliary data area, a start synchronization code area, and a material having time-sequenced material data from which margin data has been deleted or extracted margin data. A payload area into which item data or system item data having information on material item data is inserted,
A data receiving means for receiving a transmission packet of a serial data transfer interface composed of: and time-sequential material data received by the data receiving means,
A margin addition processing means for adding a predetermined amount of data as margin data from the beginning of the material data of the next frame as margin data, wherein the time-sequence material data to which the margin data is added is transferred to the recording medium in the allocated processing period. It is to be recorded.

In the present invention, when the SDTI-CP format is used for transmitting material data, and when transmitting material data with margin data recorded on a hard disk device or the like, the margin data added to the material data is transmitted. Is deleted, and the extra data of the last frame is extracted and transmitted so as to be distinguished in another frame. When the material data is received, the margin data is added to the material data by using the data of the next frame and recorded on the hard disk device or the like. Further, when the extracted extra data is received, it is added to the material data of the last frame and recorded.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a data recording / reproducing apparatus, for example, an AV server.
The V server includes an input / output processing unit 20, a storage unit 30, and an operation management unit 40.
And the storage unit 30 and the operation management unit 40 are connected via a bus 50.

A plurality of input / output processing sections 20 can be provided. The input / output processing section 20 converts a transmission packet of a predetermined format supplied from the outside into a program such as a program which is material data in chronological order. Compressed video data and uncompressed or compressed audio data are separated, and the video / audio data is recorded in the storage unit 30. The information data supplied together with the material data in time order is supplied to the operation management unit 40. Also, the input / output processing unit 2
At 0, the video / audio data recorded in the storage unit 30 and the information data from the operation management unit 40 are read and output to the outside. The writing and reading of the video / audio data and the information data are performed via the bus 50.

In transmission of time-ordered material data, etc., SDT
It is assumed that an I-CP (Content Package) format is used. This SDTI-CP format is SMPT
E-259M "10-bit 4: 4: 2 Component and 4fsc NTSC
Composite Digital Signals-Serial Digital Interfac
e "(hereinafter referred to as the" SDI format ") using the standardized SMPTE-305M" Serial D "
Ata Transport Interface (hereinafter referred to as "SDTI format") is used to transmit data such as video and audio in a payload section.

Here, the format of the SDTI-CP will be described. In SDTI-CP, essential data of a program, for example, video and audio material data, is used as an essence (Ess
and information such as the title of the program, the video system (NTSC or PAL), and the audio sampling frequency are described as metadata.
And The content element (Content Element) is constructed from this essence and metadata, and the video and audio content items (Content Item) are generated using multiple content elements, and the content package is generated from the multiple content items and content elements. (Content Package), and the content package is transmitted using the payload area of the SDTI format.

FIG. 2 shows the SDTI-CP format. For example, in the case of a digital video signal of the NTSC 525 system, four words from the first word to the fourth word of each line are coded EAV (En
d of Active Video). 2 from the 5th word to the 272nd word
68 words are used as an auxiliary data area (ancillary data area) for storing auxiliary data, and store header information.

In the header information, the line number of the video frame and the word length of the payload area from the SAV to the EAV are set, and the payload area described later is fixed-length data or variable-length data. , And the address and the like of the sending side and the receiving side. In the SDTI-CP format, since the compressed video data is transmitted as a content item, the data amount differs for each picture, and the payload area is data of a variable length format.

Next, four words from the 273rd word to the 276th word are represented by a code SAV (Start of Active Video).
o) is used as a start synchronization code area for storing. The 277th and subsequent words correspond to a payload area in the SDTI format, and a content package is inserted into this area. In FIG. 2, the numbers in parentheses indicate the case of a PAL625 video signal.

Next, in the payload area shown in FIG. 2, data of items such as video are packaged as SDTI format variable-length blocks as described above. FIG. 3 shows the format of a variable-length block. "Separator" and "End Cod"
"e" indicates the start and end of the variable length block.

“Data Type” indicates what item the packaged data is, and the value of “Data Type” is, for example, “04h” in a system item (System Item), “05h” is set for a picture item (Picture Item) which is a material item, and “06h” is set for an audio item (Audio Item). AU that is another data
In the X item (Auxiliary Item), it is set to “07h”.
One word is 10 bits, for example, "04h"
In the case of 8 bits as shown in (1), 8 bits correspond to bits b7 to b0. Further, by adding even parity of bits b7 to b0 as bit b8 and adding logically inverted data of bit b8 as bit b9, data of 10 bits is obtained.

In “Word Count”, “Data
The “Dat” indicates the number of words of “Block”.
"a Block" is the data of each item. Here, the data of each item is packaged in a picture unit, for example, a frame unit, and the switching position of the program is set to a position of 10 lines in the NTSC system. 1 in
From the third line, system items, picture items,
Audio items and AUX items are transmitted in this order.

FIG. 4 shows the configuration of a system item. "System ItemType" and "Wor
“d Count” is “Data Ty” of the variable-length block.
pe "and" Word Count ". In one word "System Item Bitmap",
For example, a flag indicating whether an error detection and correction code such as a Reed-Solomon code is added,
flag indicating whether or not there is information of abel, Refer
ence Date / Time stamp, Curr
There are provided a flag indicating whether or not ent Date / Time stamp is included in the system item, a flag indicating whether a picture item, an audio item, and an AUX item are located after the system item, and the like. One-word “Content Package R”
“ate” indicates a package rate, which is the number of packages per second in the 1 × speed operation. In addition, one-word “Content Package”
In “e Type”, “StreamStat” for identifying the position of the picture unit in the stream is used.
An "es" flag, a transmission mode of the transmission packet, and a transmission timing mode when transmitting the transmission packet are shown.

"Content Package Ty"
"Channel" followed by two words "Channel Handl"
"e" is for determining the content package of each program when the content packages of a plurality of programs are multiplexed and transmitted. Also, the two-word “Co”
The "nuity count" is a 16-bit modulo counter. When a stream is switched by a stream switcher or the like, the value of this counter can be used to detect a switching point (editing point).

After “Continuity Count”, SMPTE Label or Reference
Date / Time and Current Date
/ Time indicating "SMPTE Universal"
Label "," Reference Date / Ti
me stamp "," Current Date / T
An “im stamp” area is provided.

After that, "Package Meta"
data Set ”or“ Picture Metada ”
ta Set "," Audio Metadata Se "
t "" Auxiliary Metadata Se
A "t" region is provided. In addition, "Picture Me
tadata Set "," Audio Metadat "
a Set "," Auxiliary Metadata "
Set ”indicates that the corresponding item is“ System I
It is provided when it is indicated that the content is included in the content package by the flag of “tem Bitmap”.

This "Package Metadata"
In the “Set” area, information on a content package such as a program title is shown. "Picture M
etadata Set "," Audio Metada "
ta Set "," Auxiliary Metadata "
In the “a Set” area, information on a corresponding packaged item such as video, audio, or AUX data is shown.

FIG. 5 shows the structure of items such as video and audio (hereinafter referred to as "material items") excluding system items. Block “It” for each item
“emType” indicates the type of the item, and is “05h” for a picture item, “06h” for an audio item, and “07h” for an AUX data item. In “Item Word Count”, the number of words up to the end of this block (“Wo of variable-length block”
rd Count ”). "Item
"Word Head" followed by "Item Head"
er "," Element Data Bloc "
The number "k" is indicated. The “Element Data Block” following the “ItemHeader” is the data area of the item.

As shown in FIG. 1, the input / output processing unit 20 for transmitting / receiving data in such a format includes an input / output control circuit 201, buffer memories 202 and 209, a margin deletion extraction processing circuit 203, and a data transmission circuit 204. ,
A data receiving circuit 206, a margin addition processing circuit 207,
It comprises a timing adjustment circuit 208.

The input / output control circuit 201 of the input / output processing unit 20
Now, the timing manager 4 of the operation management unit 40 described later
The video / audio data of the material to be transmitted is read from the storage unit 30 to the buffer memory 202 by using the time slot which is the processing period allocated by 01.
The video data held in the buffer memory 202 is
The data is supplied to the data transmission circuit 204. The audio data held in the buffer memory 202 is supplied to a margin deletion extraction processing circuit 203.

The margin deletion extraction processing circuit 203 deletes the margin data added to the audio data and supplies it to the data transmission circuit 204 as audio data having a data amount of a frame unit. In the process of deleting the extra data,
For example, by counting the number of audio data samples from the beginning of the frame for each frame and invalidating the audio data when the count value exceeds the number of samples for one frame, the extra data can be deleted. Also,
When the extra data is added to the last frame of the audio data in time order, the extra data added to the audio data of the last frame is extracted,
Data transmission circuit 2 separately from audio data in frame units
04.

The data transmission circuit 204 converts the supplied video data and audio data or the extracted extra data into SDTI data as the above-mentioned material item data.
-After the transmission packet is in the format of CP, parallel / serial conversion and transmission path encoding are performed, and the data is output as serial data.

Here, when transmitting the extracted marginal data, the data to be transmitted is transmitted so as to be distinguished that it is marginal data. For example, when video data cannot be obtained, or when it is determined that there is no picture item data by the “System Item Bitmap” of the system item, the data is supplied as a transmission of only margin data as material item data. It is possible to determine that the material data is extra data. In addition, the system item “Package Metadata Set” shown in FIG.
Alternatively, by inserting information indicating transmission of extra data into the area of “Audio Metadata Set”, it can be determined that transmission of extra data is possible. Further, when transmitting the extra data, it is also possible to add fixed data, for example, mute data and set the amount of data for one frame to detect this mute data to determine that the extra data is transmitted. .

The data receiving circuit 206 of the input / output processing unit 20
Then, when a transmission packet in the SDTI-CP format is received, the data is separated for each item, and the audio data for each frame supplied as an audio item is supplied to the margin addition processing circuit 207. The video data supplied as the picture item is supplied to the timing adjustment circuit 208, and the data of the system item is supplied to the input / output control circuit 201.

The margin addition processing circuit 207 uses the margin data supplied separately from the audio data of the next frame or the audio data of the frame unit to add margin data to the audio data of the frame unit. Also,
The timing adjustment circuit 208 delays the video data by the time required for the margin addition processing in the margin addition processing circuit 207, and adjusts the timing of the video data frame and the audio data frame.

The audio data to which the extra data has been added by the extra addition processing circuit 207 and the video data in which the audio data and the frame have been combined by the timing adjustment circuit 208 are supplied to and stored in the buffer memory 209.

The video and audio material data stored in the buffer memory 209 is recorded in the storage unit 30 by the input / output control circuit 201 using the time slot period assigned by the timing manager 401 of the operation management unit 40. Is done.

The input / output control circuit 201 controls the operation of the margin deletion extraction processing circuit 203, generates system item data and the like, and outputs the data to the data transmission circuit 20.
4 When data of a system item or the like is supplied from the data receiving circuit 206, the operation of the margin addition processing circuit 207 is controlled based on the supplied data.

The storage unit 30 is a recording / reproducing apparatus using a random-accessible recording medium, for example, Patterns
on et al., 1988 (“A Case f
or Redundant Arrays of Inexpensive Disks (RAI
D) ”, ACM SIGMOND Conference, Chicago, II
I, Jun. 1-3, 1988.), a RAID (Redundan
t Arrays of InexpensiveDisks). The storage unit 30 records the video data and the audio data supplied from the input / output processing unit 20. The recording medium that can be randomly accessed may be an optical disk, a semiconductor memory, or the like.

The timing manager 40 of the operation management unit 40
In 1, a processing period for each input / output processing unit 20 is allocated by setting a time slot by time-sharing the use right of the bus 50. For this reason, even if a plurality of input / output processing units 20 are connected to the bus 50, each of the input / output processing units 20 can correctly write and read video / audio data.

The file manager 402 manages what kind of material data is recorded in which position in the storage unit 30. Also, the effect manager 40
An operation panel (not shown) is connected to 3 to operate the AV server according to the operation of the operation panel.

Next, the transmission operation of the material data will be described. FIG. 6A shows the material data read from the storage unit 30 and stored in the buffer memory 202, and additional data is added to the audio data as shown by the hatched portions. The material data stored in the buffer memory 202 is read by the input / output control circuit 201, and video data is supplied to the data transmission circuit 204 as shown in FIG. 6B. In addition, the margin data is deleted from the voice data by the margin deletion extraction processing circuit 203 and supplied to the data transmission circuit 204. Further, the audio data F (k) -a to F (k + 2) -a are data in units of frames in time order, and are the last frames of the continuous frames of the audio data F (k + 2) -a. At times, the extra data MS added to the audio data F (k + 2) -a is extracted and supplied to the data transmission circuit 204 separately from the audio data in frame units.

The data transmission circuit 204 configures a system item using the data supplied from the input / output control circuit 201, and converts the video data into a picture item,
As shown in FIG.
It is transmitted as a transmission packet in the DTI-CP format. Further, the extra data MS is transmitted in the next frame of the video data F (k + 2) -v and the audio data F (k + 2) -a which are the last frames. Here, in the transmission of the margin data MS, the margin data is transmitted such that it can be determined that the data is margin data as described above.

As described above, even when margin data is added to the frame-based material data and recorded in the storage unit 30, when the material data recorded in the storage unit 30 is supplied to an external device, The extra data is deleted and transmitted as a data amount per frame. Therefore, even when the material data with the margin recorded in the storage unit 30 is recorded on a device having a fixed data amount per frame, for example, a video tape recorder, the material data from which the margin data is deleted is supplied. Therefore, the material data can be recorded and reproduced correctly. Further, since the extra data is transmitted in a distinguishable manner, ignoring the frame of the extra data MS can prevent a malfunction due to the supply of the extra data MS.

As shown in FIG. 6B, the extra data MS is transmitted in the next frame of the audio data F (k + 2) -a which is the last frame, so that the material data and material data of the next frame are transmitted. Data MS supplied after
6A, the material data to which the margin data shown in FIG. 6A is added can be restored and recorded in the storage unit 30.

Next, the operation of receiving the material data when the margin data MS is supplied in the next frame of the audio data F (k + 2) -a will be described. Data receiving circuit 206
Then, when the transmission packet in the SDTI-CP format is received as described above, the data is separated for each item, and the audio data supplied as the audio item is supplied to the margin addition processing circuit 207 and supplied as the picture item. The obtained video data is supplied to the timing adjustment circuit 208. The data of the system item is supplied to the input / output control circuit 201.

When the input / output control circuit 201 determines that the data is the margin data MS based on the data of the system item, the input / output control circuit 201 controls the operation of the margin addition processing circuit 207 to generate the audio data F (k + 2) −. At the timing of the frame next to a, the output of the extra data MS from the extra margin processing circuit 207 is prohibited.

FIG. 7 is a diagram showing the configuration of the margin addition processing circuit 207. The audio data supplied from the data receiving circuit 206 is supplied to the one-frame delay circuit 207a and the margin generating circuit 207b. The one-frame delay circuit 207a delays the audio data supplied from the data reception circuit 206 by one frame as shown in FIG. 8D, as shown in FIG. 8A.

The margin generating circuit 207b extracts the first predetermined amount from the audio data of each frame,
As shown in FIG. 8B, margin data is generated. In addition,
The extracted extra data MS is audio data F (k + 2) −
Since it is transmitted in the frame next to a, the first predetermined amount is extracted from the audio data of each frame to generate a margin data to be added to the audio data F (k) -a to F (k + 2) -a. it can.

The margin data generated by the margin generation circuit 207b is supplied to the delay circuit 207c, and the delay data is delayed so that the beginning of the margin data is the end position of the audio data of the corresponding frame as shown in FIG. 8C. Then, it is supplied to the adder 207d.

The audio data delayed by one frame by the one-frame delay circuit 207a is supplied to the adder 207d, and the audio data delayed by one frame and the excess data supplied from the delay circuit 207c are added. Thus, as shown in FIG. 8D, it is possible to generate audio data to which the extra data is added. The audio data to which the margin data has been added is supplied to the output control circuit 207e.

In the output control circuit 207e, the audio data to which the margin data has been added is supplied to the buffer memory 209 and held therein. Also, one frame delay circuit 207a
When the extra data MS is supplied to the adder 207d, the output of the extra data MS is prohibited,
This prevents the extra data MS from being output after the audio data of the last frame.

The video data shown in FIG. 8A is processed by the timing adjustment circuit 2 for the time required until the margin data is added to the audio data and output by the margin addition processing circuit 207.
08, and is made equal to the timing of the frame of the audio data as shown in FIG. 8D, supplied to the buffer memory 209 and held.

The video data and the audio data held in the buffer memory 209 are recorded in the storage unit 30 by the input / output control circuit 201 using the period of the assigned time slot.

As described above, even if the material data is transmitted in a state where no margin data is added, the margin data can be added using the material data of the next frame and the material data of the last frame can be added. Since the extracted extra data is added to the data, the material data transmitted as the data amount of each frame can be recorded in the storage unit 30 with the extra data added.

Further, even if the material data is transmitted in a state where the margin data is not added, the data can be recorded in the storage unit 30 with the margin data added. Not only can fade processing be performed, but also a phase shift between video and audio caused by switching of materials can be prevented.

For example, when one frame is synchronized with a video signal of (30 / 1.001) frames / second by 525 scanning lines and an audio signal having a sampling frequency of 48 kHz is divided into each frame of the video signal, The number of samples per video frame is 1601.6 samples / frame, which is not an integer value. Therefore, a reference sequence called a so-called 5-frame sequence is set as shown in FIG. 9A so that 8008 samples are obtained in 5 frames. For example, the sequence "1""3""5"
Is set to 1602 samples, and the number of samples of the sequence “2” and “4” is set to 1601, so that the number of samples from the sequence “1” to the sequence “5” is set to 8008 samples. I have.

Here, as a result of editing the material, the regularity of the sequence is no longer maintained at the edit point CP, and when the number of samples is reduced, as shown in FIG. Will be advanced. In such a case, since the material data is recorded in the storage unit 30 with the margin data added, when the number of samples is insufficient, the lack of the number of samples is compensated using the margin data as shown in FIG. 9C. Accordingly, a phase shift can be prevented.

[0058]

According to the present invention, when the material item data is marginal data to be added to the frame-based material data, information indicating that the material item data is marginal data is provided in the payload area. Is provided. Therefore, in addition to transmitting the material data by deleting the marginal data from the material data to which the marginal data is added, the marginal data is supplied when extracting and transmitting the marginal data added to the material data of the last frame. It can be correctly determined on the receiving side that the operation has been performed.

Further, it is assumed that time-sequential material data is read out from a randomly accessible recording medium in an allocated processing period, and the time-ordered material data read from the recording medium is added to frame-based material data. The marginal data is deleted, and marginal data added to the end of the time-ordered material data is extracted. This material data or marginal data is output as a transmission packet of the serial data transfer interface. For this reason, it is possible to transmit the material data recorded on the recording medium while maintaining compatibility even with a device that cannot process the material data to which the extra data is added.

Further, the transmission packet of the serial data transfer interface is received, and the first predetermined amount of data is added to the time-sequence material data from the next frame material data as margin data, and the time-sequence material data is added. When the material data is the last frame, the extra data supplied in the transmission packet is added and recorded on a recording medium that can be randomly accessed during the allocated processing period. For this reason, the receiving side of the material data can also perform processing such as cross-fading using the material data recorded on the recording medium.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a data recording / reproducing apparatus.

FIG. 2 is a diagram for explaining an SDTI-CP format.

FIG. 3 is a diagram showing a format of a variable-length block.

FIG. 4 is a diagram showing a configuration of a system item.

FIG. 5 is a diagram showing a configuration of another item except a system item.

FIG. 6 is a diagram illustrating an operation of transmitting material data.

FIG. 7 is a diagram illustrating a configuration of a margin addition processing circuit;

FIG. 8 is a diagram for explaining an operation of receiving material data.

FIG. 9 is a diagram for explaining phase adjustment of audio data.

FIG. 10 is a diagram illustrating a cross-fade process.

[Explanation of symbols]

20: input / output processing unit, 30: storage unit, 4
0: operation management unit, 50: bus, 201: input / output control circuit, 202, 209: buffer memory,
203... Margin removal extraction processing circuit, 204.
Data transmission circuit, 206 ... data reception circuit, 207
... margin addition processing circuit, 207a ... one frame delay circuit, 207b ... margin generation circuit, 207
c: delay circuit, 207d: adder, 207e
..Output control circuits, 208... Timing adjustment circuits,
401: timing manager, 402: file manager, 403: effect manager

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/765 H04N 5/781 510L 5/781 F-term (Reference) 5C053 FA14 FA21 FA23 GB06 GB11 HA21 JA03 JA05 JA23 KA05 KA24 5D044 AB07 BC01 BC06 CC04 DE03 DE12 DE40 DE49 FG30 GK12 HL11 5D110 AA13 AA17 AA29 CA05 CA13 CA42 DA04 DA18 DB02 5K028 AA14 EE03 KK01 KK13 MM04 MM16

Claims (12)

[Claims] 1. A system in which each one-line section of a video frame has an end synchronization code area, an auxiliary data area, a start synchronization code area, material item data, and information on the material item data. In a data transmission method for transmitting a transmission packet of a serial data transfer interface including a payload area into which item data is inserted, the material item data is a marginal data to be added to frame unit material data. A data transmission method comprising: inserting information indicating that the data of the material item is marginal data into the payload area. 2. The data transmission method according to claim 1, wherein the information indicating the margin data is inserted into a metadata set of the system item. 3. A system in which each one-line section of a video frame has an end synchronization code area, an auxiliary data area, a start synchronization code area, material item data, and information on the material item data. In a data transmission device for transmitting a transmission packet of a serial data transfer interface, comprising: a payload area into which data of an item is inserted; and a margin data to be added to material data in a frame unit as the material item data. A data transmission apparatus, comprising: a control unit that, when transmitting, inserts information indicating that the data of the material item is margin data into the payload area. 4. The data transmission apparatus according to claim 3, wherein the control unit inserts information indicating the margin data into a metadata set of the system item. 5. A method according to claim 1, wherein time-sequential material data is read from a randomly accessible recording medium in a processing period allocated thereto, and a marginal data added to the frame-based material data from the read time-sequential material data. And the marginal data added to the last frame of the time-sequential material data is extracted. Each one-line section of the video frame includes an end synchronization code area, an auxiliary data area, and a start synchronization area. A code area and a payload in which data of a material item having the time-ordered material data or the extracted marginal data from which the marginal data has been deleted, and a data of a system item having information on the data of the marginal item data have been inserted. Area and serial data transfer interface And generates a transmission packet, data reproducing method and outputting content data read from the recording medium. 6. The data reproducing method according to claim 5, wherein fixed data is added to the extracted margin data to obtain a data amount for one frame unit. 7. A section of each one line of a video frame includes an end synchronization code area, an auxiliary data area, a start synchronization code area, and said time-ordered material data from which marginal data has been deleted or extracted marginal data. Receiving a transmission packet of a serial data transfer interface comprising a data of a material item having a data area, and a payload area in which data of a system item having information on the data of the material item is inserted. A predetermined amount of data is added as margin data from the beginning of the material data of the next frame to the material data, and the time-ordered material data to which the margin data is added can be randomly accessed in the assigned processing period. A data recording method for recording on a medium. 8. The data recording according to claim 7, wherein when the extracted extra data is supplied by the transmission packet, the extra data is added to the time-ordered material data of the last frame. Method. 9. A method for reading out time-sequential material data recorded on the recording medium in an allocated processing period from a randomly accessible recording medium, or reading out the time-ordered material data in a processing period allocated to the recording medium. In the data recording / reproducing apparatus for recording data, from the time-sequential material data group read from the recording medium,
A margin deletion extraction processing means for deleting the margin data added to the frame-based material data and extracting the margin data added to the last frame of the time-ordered material data; The section is an end synchronization code area, an auxiliary data area, a start synchronization code area, and data of a material item having the time-ordered material data or the extracted marginal data from which the marginal data is deleted, or A data recording / reproducing apparatus, comprising: a payload area into which a system item data having information on item data is inserted; and a data transmitting means for generating and transmitting a transmission packet of a serial data transfer interface. apparatus. 10. The margin deletion extraction processing means,
10. The data recording / reproducing apparatus according to claim 9, wherein fixed data is added to the extracted marginal data to obtain a data amount for one frame unit. 11. A method for reading out time-sequential material data recorded on a recording medium from a random-accessible recording medium during an allocated processing period, or reading the time-ordered material data during a processing period allocated to the recording medium. In the data recording / reproducing apparatus for recording data, each one-line section of a video frame includes an end synchronization code area, an auxiliary data area, a start synchronization code area, and the time-ordered material data from which marginal data has been deleted. Receives a transmission packet of a serial data transfer interface composed of material item data having extracted margin data and a payload area into which system item data having information on the material item data is inserted. Data receiving means, and data received by the data receiving means. A margin addition processing means for adding a predetermined amount of data as margin data from the beginning of the material data of the next frame to the time-sequence material data, wherein the time-sequence material data to which the margin data is added Is recorded on the recording medium during the allocated processing period. 12. The margin adding unit, when the extracted margin data is obtained from the transmission packet received by the data receiving unit, adds the margin data to the time-ordered material data of the last frame. The data recording / reproducing apparatus according to claim 11, wherein the data recording / reproducing apparatus is added.