JP2000041245A - Audio video recorder - Google Patents

Abstract

An object of the present invention is to provide a recording device that can access a change point of an audio signal at a high speed when recording an audio / video signal having a plurality of audio signal modes. . SOLUTION: There are provided means for recording an audio signal and a video signal on a recording medium, and means for detecting a signal mode of the audio signal, and information on a recording position of a change point of the mode of the audio signal is stored in a predetermined position of the recording medium. Record.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for recording an audio video signal on a recording medium.

[0002]

2. Description of the Related Art Currently, audio signals of television signals being broadcast include audio multiplex broadcasting such as monaural mode, stereo mode, and bilingual broadcasting. For example,
Western broadcasting is often broadcast in two languages,
When commercials are inserted in the broadcast of the program,
Bilingual broadcasting and stereo broadcasting or monaural broadcasting may be mixed.

[0003] When an audio signal and a video signal are encoded and recorded on a recording medium, each encoded data is packed, and then each pack is multiplexed and recorded on the recording medium.

[0004] Also, there is an MPEG2 encoding system as an international standard system for compression encoding of video signals. this is,
It performs intra-frame coding and inter-frame coding, and includes a group of pictures (G
OP) as a unit.
At least one frame of this GOP is subjected to intra-frame encoding, and the remaining frames are subjected to inter-frame encoding. In the MPEG2 encoding method, this GOP is an access unit.

It is also common to detect a scene change of a video signal and match the start of the GOP with the scene change to enable access at the scene change.

[0006]

However, the point at which the mode of the audio signal has changed is the point at which the contents of the program change, and there is a problem that there is no means for accessing this change point at high speed. I was

When the audio signal and the video signal are packed and recorded, the point at which the mode of the audio signal changes does not always match the pack which is also the access unit, and the point at which the mode of the audio signal changes is accessed. They also had the problem that they could not do it.

[0008] In addition, when a video signal is encoded by the MPEG2 encoding method, it is difficult to access the audio signal at the change point because the mode change point of the audio signal does not always coincide with the GOP.

[0009] When some breaks are created as index points for a long-time video signal, a scene change and a GOP are made coincident, and using this as an index causes too many scene changes. It was difficult to create a break according to the video content such as the situation.

In view of the above, the present invention provides a recording apparatus capable of accessing a changing point of an audio signal at a high speed when recording an audio video signal having a plurality of audio signal modes such as a television broadcast. With the goal.

[0011]

A recording apparatus according to the present invention is an apparatus for recording an audio / video signal on a recording medium, comprising means for recording an audio signal and a video signal on a recording medium, and a signal mode of the audio signal. The audio recording apparatus further comprises means for detecting, and records information on a recording position of a change point of the mode of the audio signal at a predetermined position on a recording medium.

The signal mode of the audio signal may include at least two of a monaural mode, a stereo mode, a surround mode, and a voice multiplex mode.

Further, the apparatus further comprises means for encoding the audio signal and the video signal, respectively, wherein the encoded data of the audio signal and the video signal are packed into packs of a predetermined size, respectively. The pack is multiplexed and recorded on a recording medium,
The audio signal is packed so that the change point of the mode of the audio signal coincides with the head of the pack.

The video signal and the audio signal for a predetermined period are recorded as a title, and are recorded as different titles when the mode of the audio signal changes.

Further, the information relating to the audio signal mode is recorded at a predetermined position on a recording medium.

Also, the recording apparatus of the present invention is an apparatus for recording an audio / video signal on a recording medium, and means for recording an audio signal and a video signal on a recording medium,
Means for detecting a change point of the audio signal is provided, and information on a recording position of the change point is recorded at a predetermined position on a recording medium.

A recording apparatus according to the present invention is an apparatus for recording an audio / video signal on a recording medium, comprising an audio encoding means for encoding an audio signal and outputting audio encoded data, and an audio encoding means for encoding a video signal. Video encoding means for outputting video encoded data, means for recording the video encoded data and the audio encoded data on a recording medium, and means for detecting a change point of the signal mode of the audio signal, The video encoding means comprises:
One or more frames (hereinafter, or fields)
Is a group of pictures (GOP), at least one frame of the GOP is subjected to intra-frame encoding processing, the remaining frames are subjected to inter-frame encoding processing, and the mode change point of the audio signal is set at the head of the GOP. It is configured as follows.

Further, the recording apparatus of the present invention is an apparatus for recording an audio / video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting encoded audio data; Video encoding means for outputting encoded video data, means for recording the encoded video data and the encoded audio data on a recording medium, and means for detecting a change point of the audio signal. The coding means sets one or a plurality of frames (hereinafter, or fields) as a group of pictures (GOP), at least one of the GOPs is subjected to intra-frame coding, and the remaining frames are subjected to inter-frame coding. The change point of the audio signal is set to be the head of the GOP.

The recording apparatus of the present invention is an apparatus for recording an audio / video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting audio encoded data; Video encoding means for outputting video encoded data, means for packing the audio encoded data into audio packs of a predetermined size, means for packing the video encoded data into video packs of a predetermined size, Means for multiplexing the audio pack and the video pack;
Means for recording the multiplexed data pack on a recording medium,
Means for detecting a change point of the signal mode of the audio signal, wherein the head of one or both of the audio pack and the video pack is matched with the signal mode change point of the audio signal. It was done.

Further, the recording apparatus of the present invention is an apparatus for recording an audio / video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting encoded audio data; Video encoding means for outputting video encoded data, means for packing the audio encoded data into audio packs of a predetermined size, means for packing the video encoded data into video packs of a predetermined size, Means for multiplexing the audio pack and the video pack;
Means for recording the multiplexed data pack on a recording medium,
Means for detecting a transition point of an audio signal, wherein any of the audio pack and the video pack,
Alternatively, both heads are made to coincide with the change point of the audio signal.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, an embodiment of a recording apparatus according to the present invention will be described in detail with reference to the drawings.

First, a first embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 1, the recording apparatus of this embodiment
Video signal encoder 101, audio signal encoder 1
02, audio mode detector 103, recording processor 10
4. The recording medium 10 which is constituted by the recording head 105
Record in 6.

The input video signal is encoded by the video signal encoder 101 and video encoded data is output. Similarly, the audio signal is encoded by the audio signal encoder 102, and audio encoded data is output.

The audio mode detector 103 detects a plurality of audio signal modes such as a stereo mode, a monaural mode, a surround mode, and a voice multiplex mode such as a bilingual mode.

The recording processor 104 has video encoded data,
The recording head 105 records the audio encoded data.
In the recording medium 106. Further, the recording processor 104 processes the recording position of the video coded data or audio coded data corresponding to the change point of the audio signal mode at a predetermined position of the recording medium 106 in accordance with the video and audio coded data. I do.

With this configuration, when reproducing the recording medium, by reading the recording position of the change point of the audio signal mode, it is possible to access the change point of the audio signal mode at high speed. .

The audio signal mode is a monaural mode, a stereo mode, a surround mode, and an audio multiplex mode. However, it is sufficient that at least two of these modes are included, and other modes may be included. .

(Embodiment 2) Next, a second embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 2 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 2, the recording apparatus of the present embodiment
Video signal encoder 201, audio signal encoder 2
02, audio mode detector 203, recording processor 20
4. It is composed of a recording head 205, a video packer 207, and an audio packer 208, and records on the recording medium 206.

The input video signal is encoded by the video signal encoder 201, and video encoded data is output. The video packer 207 packs the video signal into a predetermined size pack and outputs the video pack. Similarly, the audio signal is encoded by the audio signal encoder 202, and the encoded audio data is output. The audio packer 208 packs the audio signal into a pack of a predetermined size and outputs the audio pack.

The audio mode detector 203 detects a plurality of audio signal modes such as a stereo mode, a monaural mode, a surround mode, and an audio multiplex mode, similarly to the audio mode detector 103 of the first embodiment.

The video packer 207 and the audio packer 208 insert a predetermined pack header at the head of the video pack and the audio pack and pack them. The head of this pack and the audio mode detector 20
3. The respective encoded data are packed so that the audio mode change points detected by step 3 match.

The recording processor 204 multiplexes a video pack and an audio pack, performs recording processing, and performs recording processing.
In the recording medium 206. Further, the recording processor 204 performs processing to record information for specifying the recording position of the video pack or the audio pack corresponding to the change point of the audio signal mode at a predetermined position of the recording medium 106.

With this configuration, it is possible to access the change point of the audio signal mode at high speed by reading the recording position of the change point of the audio signal mode from the recording medium. Further, in the present embodiment in which the data is packed and recorded, the pack is the access unit.
By matching the head of the pack with the change point of the audio signal mode, access can be easily made at the change point of the audio signal mode.

Incidentally, the method of aligning the position of arbitrary encoded data with the head position of the pack may be to insert predetermined stuffing data or to change the size information described in the pack header or the like. Good.

In the first and second embodiments,
The information on the recording position of the change point of the audio signal mode may be address information on the recording medium.

Further, a predetermined memory is provided, and during recording of the audio / video signal, every time the audio signal mode changes, the recording position information of the change point is stored in the predetermined memory, and the recording of the audio / video signal is completed. Thereafter, the data may be read from the predetermined memory and recorded at a predetermined position on the recording medium.

As the recording position information of the change point, address information of the change point, an address immediately before the change of the audio signal mode, or a recording end address of the audio video signal may be recorded.

As the recording position information of the change point, address information of the change point and a recording data amount until the audio signal mode is changed or the recording of the audio video signal is completed may be recorded.

The recording position information of the change point may be recorded in a predetermined area as data recording management information of the audio / video signal.

The recording position information of the change point and information representing the audio signal mode may be recorded as data recording management information.

The recording position information of the change point may be recorded as one of the header information of the audio / video coded data.

When recording a video signal and an audio signal in units of titles, when the audio signal mode changes, the recording process may be continued as a different title. By doing so, the audio signal mode in each title can be the same, and recording / reproducing management becomes easy.

Also, information representing the attributes of the video signal and audio signal of each title is recorded as title management information at a predetermined position on a recording medium for each title, and the recording position information of the change point of the audio signal mode is recorded in the title management information. What is necessary is just to record as one.

Further, a predetermined memory is provided, and during recording of the audio / video signal, whenever the audio signal mode changes, the recording position information of the change point is stored in the predetermined memory, and the recording of the audio / video signal is completed. After doing
The information may be read from the predetermined memory and recorded at a predetermined position as one of the title management information.

As the recording position information of the change point, the address information of the change point and the address immediately before the change of the audio signal mode or the recording end address of the audio video signal are recorded as one of the title management information. You may.

As the recording position information of the change point, the address information of the change point and the recording data amount until the audio signal mode is changed or the recording of the audio video signal is completed are included in one of the title management information. May be recorded.

Further, the recording position information of the change point and the information representing the audio signal mode may be recorded as one of the title management information.

(Embodiment 3) Next, a third embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 3 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 3, the recording apparatus of the present embodiment
Video signal encoder 301, audio signal encoder 3
02, a signal change detector 303, a recording processor 304, and a recording head 305, and perform recording on a recording medium 306.

The input video signal is encoded by the video signal encoder 301, and video encoded data is output. Similarly, the audio signal is encoded by the audio signal encoder 302, and audio encoded data is output.

The signal change detector 303 detects a change point of the audio signal. The recording processor 104 performs recording processing of video encoded data and audio encoded data, and records the encoded data on a recording medium 106 by a recording head 105. further,
The recording processor 104 processes the recording position of the video encoded data or the audio encoded data at the changing point of the audio signal in accordance with the video and audio encoded data so as to be recorded at a predetermined position on the recording medium 106.

The audio signal is attached in relation to the content of the video signal, for example, the BGM changes when the scene or situation changes, and the change in the audio signal substantially coincides with the change in the video content.

With this configuration, when reproducing the recording medium, by reading out the recording position of the change point of the audio signal, the change point of the audio signal can be accessed at high speed.

The method of detecting the change point of the audio signal may be to detect a level change, or to detect a change in the audio signal by detecting a silent state.
The spectrum distribution may be detected, and any method may be used as long as it detects a change in the audio signal.

Further, the method of detecting the change point of the audio signal is such that when a silent state of the audio signal continues for a predetermined period,
A point in the silent period may be detected as a change point of the audio signal.

In the method of detecting a change point of an audio signal, a point at which the audio signal enters a sound state after a predetermined period of silence may be detected as a change point of the audio signal.

(Embodiment 4) Next, a fourth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 4 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 4, the recording apparatus of the present embodiment
Video signal encoder 401, audio signal encoder 4
02, a signal change detector 203, a recording processor 404, a recording head 405, a video packer 407, and an audio packer 408. The input audio / video signal is recorded on a recording medium 406.

The input video signal is encoded by the video signal encoder 401, and video encoded data is output. The video packer 407 packs the video signal into a predetermined size pack and outputs the video pack. Similarly, the audio signal is encoded by the audio signal encoder 402 to output audio encoded data, and the audio packer 408 packs the audio signal into a pack of a predetermined size and outputs the audio pack.

The signal change detector 403 detects a change point of the audio signal, similarly to the signal change detector 303 of the third embodiment.

The video packer 407 and the audio packer 408 insert a predetermined pack header at the head of the video pack and the audio pack and pack them. The pack is detected by the signal change detector 403. The respective encoded data are packed so that the audio signal change points coincide with each other.

A recording processor 404 multiplexes a video pack and an audio pack, performs recording processing, and performs recording processing.
On the recording medium 406. Further, the recording processor 404 performs processing so as to record, at a predetermined position on the recording medium 406, information that can specify the recording position of the video pack or the audio pack corresponding to the transition point of the audio signal.

With this configuration, when reproducing the recording medium, by reading the recording position of the change point of the audio signal, it is possible to access the change point of the audio signal at high speed. Further, in the present embodiment in which a pack is recorded as a pack, the pack is an access unit. By matching the head of the pack with the change point of the audio signal, access is possible at the change point of the audio signal.

As a method of matching the position of arbitrary encoded data with the start position of a pack, predetermined stuffing data may be inserted, or the size information of the pack may be changed.

In the third and fourth embodiments,
The information on the recording position of the change point of the audio signal may be address information on the recording medium.

Also, a predetermined memory is provided, and during recording of the audio / video signal, recording position information of a change point of the audio signal is stored in the predetermined memory, and after the recording of the audio / video signal is completed, the predetermined memory is stored. And may be recorded at a predetermined position on a recording medium.

As the recording position information of the change point, the address information of the change point and the address immediately before the change of the audio signal or the recording end address of the audio video signal may be recorded.

Further, as the recording position information of the change point, address information of the change point and a recording data amount until the audio signal changes or the recording of the audio video signal ends may be recorded.

The recording position information of the change point may be recorded in a predetermined area as data recording management information of the audio / video signal.

The recording position information of the change point may be recorded as one of the header information of the audio / video coded data.

When a video signal and an audio signal are recorded in units of titles, the recording process may be continued as different titles in accordance with changes in the audio signal.

Information representing the attributes of the video signal and audio signal of each title is recorded as title management information at a predetermined position on the recording medium for each title, and the recording position information of the change point of the audio signal is recorded in the title management information. It is sufficient to record as one.

Further, a predetermined memory is provided, and during recording of the audio / video signal, every time the audio signal changes, the recording position information of the change point is stored in the predetermined memory, and the recording of the audio / video signal is completed. Thereafter, the information may be read from the predetermined memory and recorded at a predetermined position as one of the title management information.

As the recording position information of the change point, the address information of the change point and the address immediately before the change of the audio signal or the recording end address of the audio / video signal are recorded as one of the title management information. Is also good.

As the recording position information of the change point, the address information of the change point and the recording data amount until the audio signal changes or the recording of the audio video signal ends are taken as one of the title management information. It may be recorded.

(Embodiment 5) Next, a fifth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 5 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 5, the recording apparatus of the present embodiment
Video signal encoder 501, audio signal encoder 5
02, audio mode detector 503, recording processor 50
4. The recording medium 50, which is constituted by the recording head 505
Record in 6.

The video signal encoder 501 includes a first selector 507, a second selector 510, an intra-frame encoder 508, and an inter-frame encoder 509.

The input video signal is encoded by the video signal encoder 501, and video encoded data is output. Similarly, the audio signal is encoded by the audio signal encoder 502, and audio encoded data is output.

The audio mode detector 503 detects a plurality of audio signal modes such as a stereo mode, a monaural mode, a surround mode, and an audio multiplex mode, similarly to the audio mode detector 103 of the first embodiment.

The recording processor 504 has video encoded data,
The recording head 505 records the audio encoded data.
On the recording medium 506.

The input video signal is supplied to the first selector 5
07, the signal is selectively input to the intra-frame encoder 508 and the inter-frame encoder 509, and the second selector 51
“0” selects and outputs the output of the intra-frame encoder 508 and the output of the inter-frame encoder 509. The intra-frame encoder 508 performs an intra-frame encoding process on the input video signal, and the inter-frame encoder 509 performs an inter-frame encoding process on the video signal. Intra-frame encoding processing is performed at intervals of a plurality of frames, and a group of pictures (GOP) is formed based on this cycle to perform encoding processing. Normally, the selector 507 and the selector 510 operate so that a GOP is formed at a predetermined cycle and encoding processing is performed. However, when a change in the audio signal mode is detected by the audio mode detector 503, control is performed so that the GOP is configured such that this change point coincides with the beginning of the GOP.

In the case where the intra-frame encoding process is performed periodically as described above, the GOP is used as an access unit. By configuring as described above, when the recording medium is reproduced, the change point of the audio signal mode is changed. And can be easily accessed.

(Embodiment 6) Next, a sixth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 6 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 6, the recording apparatus of this embodiment
Video signal encoder 601, audio signal encoder 6
02, audio mode detector 603, recording processor 60
4. A recording head 605, a video packer 607, and an audio packer 608, which record on a recording medium 606.

The video signal encoder 601 comprises a first selector 609 and a second selector 6 as in the fifth embodiment.
12, an intra-frame encoder 610 and an inter-frame encoder 611.

The input video signal is encoded by a video signal encoder 601 to output video encoded data. The video packer 607 packs the video signal into a predetermined size pack and outputs a video pack. Similarly, the audio signal is encoded by the audio signal encoder 602 to output audio encoded data, and the audio packer 608 packs the audio signal into a pack of a predetermined size and outputs the audio pack.

The audio mode detector 603 detects a plurality of audio signal modes such as a stereo mode, a monaural mode, a surround mode, and an audio multiplex mode, similarly to the audio mode detector 103 of the first embodiment.

The video packer 607 and the audio packer 608 insert a predetermined pack header at the head of the video pack and the audio pack and pack them. The head of the pack and the audio mode detector 60
3. The respective encoded data are packed so that the audio mode change points detected by step 3 match.

A recording processor 604 multiplexes a video pack and an audio pack, performs recording processing, and performs recording processing.
On the recording medium 606.

The operation of the video signal encoder 601 is the same as that of the fifth embodiment, the GOP is formed, the intra-frame encoding process and the inter-frame encoding process are performed, and the mode change point of the audio signal is changed. At the beginning of the GOP.

In the present embodiment, the point which is the head of the GOP and the head of the pack is an accessible point. However, by configuring as in this embodiment, the GOP
And the beginning of the pack coincide with the change point of the audio signal mode, and access can be made at the change point of the audio signal mode.

A method for matching the position of arbitrary coded data with the start position of a pack may be such that predetermined stuffing data may be inserted or size information described in the pack header or the like may be changed. Good.

In the fifth and sixth embodiments, information on the audio signal mode may be recorded at a predetermined position on the recording medium.

When recording a video signal and an audio signal in units of titles, when the audio signal mode changes, the recording process may be continued as a different title. By doing so, the audio signal mode in each title can be the same, and recording / reproducing management becomes easy.

Further, it is possible to record title management information representing the attributes of a video signal and an audio signal at a predetermined position on a recording medium for each title, and record information representing the audio signal mode as one of the title management information. Good.

A predetermined memory is provided, and each time the audio signal mode changes, the audio signal mode is stored in the predetermined memory. After the recording of the audio video signal is completed, the audio signal mode is stored in the predetermined memory. The audio signal mode of each title may be recorded as one of the title management information.

(Embodiment 7) Next, a seventh embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 7 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 7, the recording apparatus of the present embodiment
Video signal encoder 701, audio signal encoder 7
02, audio mode detector 703, recording processor 70
4. It is composed of a recording head 705, a video packer 707, and an audio packer 708, and records on a recording medium 706.

The video signal encoder 701 includes a first selector 709 and a second selector 7 as in the fifth embodiment.
12, an intra-frame encoder 710 and an inter-frame encoder 711.

This embodiment is almost the same as the sixth embodiment. The head of the GOP in the video signal encoding process is
Recording is performed on the recording medium 706 so that the head of the video pack and the audio pack and the mode change point of the audio signal coincide with each other. The difference is that the specified information is recorded on a recording medium.

With this configuration, it is possible to access at the changing point of the audio signal mode, and
By reading the information specifying the mode change point, it is possible to process the access to the mode change point at high speed.

The recording position information of the change point of the audio signal mode may be used as address information on the recording medium.

A predetermined memory is provided, and during the recording of the audio / video signal, whenever the audio signal mode changes, the recording position information of the change point is stored in the predetermined memory, and the recording of the audio / video signal is completed. Thereafter, the data may be read from the predetermined memory and recorded at a predetermined position on the recording medium.

As the recording position information of the change point, address information of the change point, an address immediately before the change of the audio signal mode, or a recording end address of the audio video signal may be recorded.

Further, as the recording position information of the change point, the address information of the change point and the amount of recording data until the audio signal mode changes or the recording of the audio video signal ends may be recorded.

The recording position information of the change point may be recorded in a predetermined area as data recording management information of the audio / video signal.

Further, recording position information of a change point and information representing the audio signal mode may be recorded as data recording management information.

The recording position information of the change point may be recorded as one of the header information of the audio / video coded data.

When recording a video signal and an audio signal in units called titles, when the audio signal mode changes, the recording process may be continued as a different title. By doing so, the audio signal mode in each title can be the same, and recording / reproducing management becomes easy.

Information indicating the attributes of the video signal and audio signal of each title is recorded as title management information at a predetermined position on the recording medium for each title, and the recording position information of the change point of the audio signal mode is recorded in the title management information. What is necessary is just to record as one.

Further, a predetermined memory is provided, and during recording of the audio / video signal, every time the audio signal mode changes, the recording position information of the change point is stored in the predetermined memory, and the recording of the audio / video signal is completed. After doing
The information may be read from the predetermined memory and recorded at a predetermined position as one of the title management information.

As the recording position information of the change point, the address information of the change point and the address immediately before the change of the audio signal mode or the recording end address of the audio / video signal are recorded as one of the title management information. You may.

As the recording position information of the change point, the address information of the change point and the recording data amount until the audio signal mode is changed or the recording of the audio video signal is completed are included in one of the title management information. May be recorded.

Also, the recording position information of the change point and the information indicating the audio signal mode may be recorded as one of the title management information.

(Eighth Embodiment) Next, an eighth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 8 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 8, the recording apparatus of the present embodiment
Video signal encoder 801, audio signal encoder 8
02, a signal change detector 803, a recording processor 804, and a recording head 805 for recording on a recording medium 806.

Also, as in the fifth embodiment, the video signal encoder 801 comprises a first selector 807, a second selector 810, an intra-frame encoder 808, an inter-frame encoder 809, Consists of

The input video signal is encoded by a video signal encoder 801 and video encoded data is output. Similarly, the audio signal is encoded by the audio signal encoder 802, and audio encoded data is output.

The recording processor 804 has video encoded data,
The recording head 805 records the audio encoded data.
On the recording medium 506.

The signal change detector 803 detects a change point of the audio signal similarly to the signal change detector 303 of the third embodiment.

The input video signal is subjected to intra-frame encoding and inter-frame encoding for each GOP as in the fifth embodiment. However, when a change in the audio signal is detected by the signal change detector 803,
Control is performed so that the GOP is configured so that this change point coincides with the beginning of the GOP.

When a GOP is formed and the intra-frame encoding process is performed periodically, the GOP is an access unit.
With the configuration described above, it is possible to easily access the audio signal at the point where the signal of the audio changes when reproducing the recording medium.

(Embodiment 9) Next, a ninth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 9 is a block diagram of the recording apparatus of this embodiment.

As shown in FIG. 9, the recording apparatus of the present embodiment
Video signal encoder 901, audio signal encoder 9
02, a signal change detector 903, a recording processor 904, a recording head 905, a video packer 907, and an audio packer 908.
Record in 6.

Further, the video signal encoder 901 comprises a first selector 909 and a second selector 9 as in the fifth embodiment.
12, an intra-frame encoder 910 and an inter-frame encoder 911.

The input video signal is encoded by a video signal encoder 901 to output video encoded data. The video packer 907 packs the video signal into a predetermined size pack and outputs a video pack. Similarly, the audio signal is encoded by an audio signal encoder 902, and audio encoded data is output. The audio packer 908 packs the audio signal into a pack of a predetermined size and outputs an audio pack.

The signal change detector 903 detects a change point of the audio signal as in the signal change detector 303 of the third embodiment.

The video packer 907 and the audio packer 908 insert a predetermined pack header at the head of the video pack and the audio pack, and pack them. The pack is detected by the signal change detector 903. Each encoded data is packed so that the change point of the audio signal matches.

A recording processor 904 multiplexes a video pack and an audio pack, performs recording processing, and performs recording processing.
On the recording medium 906.

The operation of the video signal encoder 901 is the same as that of the eighth embodiment, and the GOP is formed to perform the intra-frame encoding process and the inter-frame encoding process. At the beginning of the GOP.

In the present embodiment, the point which is the head of the GOP and the head of the pack is an accessible point. However, the configuration as in the present embodiment enables the start of the GOP, the head of the pack, and the audio signal. The change point coincides, and access at the change point of the audio signal becomes possible.

The method of matching the position of arbitrary encoded data with the start position of the pack may be such that predetermined stuffing data may be inserted or the size information described in the pack header or the like may be changed. Good.

In the eighth and ninth embodiments, when a video signal and an audio signal are recorded in a unit called a title, when the audio signal changes, the recording process may be continued as a different title.

(Embodiment 10) Next, a tenth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 10 is a block diagram of the recording apparatus of this embodiment.

As shown in FIG. 10, the recording apparatus of this embodiment comprises a video signal encoder 1001, an audio signal encoder 1002, an audio mode detector 1003, a recording processor 1004, a recording head 1005, a video packer 1007, and an audio packer 1008, and records the information on the recording medium 706.

The video signal encoder 1001 includes a first selector 1009, a second selector 1012, an intra-frame encoder 1010, and an inter-frame encoder 1011 as in the fifth embodiment. Be composed.

This embodiment is almost the same as the ninth embodiment. The head of the GOP in the video signal encoding process is
The recording medium 100 is set so that the beginning of the video pack and the audio pack coincide with the change point of the audio signal.
6, recording information specifying the recording positions of the video pack and the audio pack, which are the changing points of the audio signal, is recorded on the recording medium 1006.

With this configuration, it is possible to access at the changing point of the audio signal, and it is possible to process the access to the changing point at a high speed by reading the information specifying the changing point of the audio signal. Becomes

(Eleventh Embodiment) Next, an eleventh embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG.
FIG. 2 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 11, the recording apparatus of this embodiment comprises a video signal encoder 1101, an audio signal encoder 1102, an audio mode detector 1103, a recording processor 1104, a recording head 1105, a video packer 1107, and an audio packer 1108, and records it on the recording medium 1106.

The input video signal is encoded by a video signal encoder 1101 and video encoded data is output. The video packer 1107 packs the video signal into a pack of a predetermined size and outputs a video pack.
Similarly, the audio signal is output from the audio signal encoder 11.
02, the encoded audio data is output, and the audio packer 1108 packs it into a pack of a predetermined size and outputs an audio pack.

As in the second embodiment, the audio mode detector 1103 includes a stereo mode, a monaural mode,
A plurality of audio signal modes such as a surround mode and an audio multiplex mode are detected.

The video packer 1107 and the audio packer 1108 insert a predetermined pack header at the head of the video pack and the audio pack to pack the data. The head of the pack and the audio mode detector 1103 are detected. The respective encoded data are packed so that the audio mode change points coincide with each other.

In the present embodiment in which a pack is recorded and recorded, the pack is an access unit. By matching the head of the pack with the change point of the audio signal mode, access is possible at the change point of the audio signal mode.

The method of matching the position of arbitrary encoded data with the start position of the pack may be such that predetermined stuffing data may be inserted or the size information described in the pack header or the like may be changed. Good.

[0149] The information on the audio signal mode may be recorded at a predetermined position on the recording medium.

When recording a video signal and an audio signal in a unit called a title, when the audio signal mode changes, the recording process may be continued as a different title. By doing so, the audio signal mode in each title can be the same, and recording / reproducing management becomes easy.

Further, it is possible to record title management information representing attributes of video signals and audio signals at a predetermined position on a recording medium for each title, and record information representing the audio signal mode as one of the title management information. Good.

A predetermined memory is provided. Each time the audio signal mode changes, the audio signal mode is stored in the predetermined memory, and after the recording of the audio / video signal is completed, the data is stored in the predetermined memory. The audio mode signal of each title may be recorded as one piece of title management information.

The audio signal mode is the monaural mode, the stereo mode, and the audio multiplex mode. However, the audio signal mode may include at least two of them, and may include other modes such as the surround mode. .

(Twelfth Embodiment) Next, a twelfth embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG.
FIG. 2 is a block diagram of the recording apparatus of the present embodiment.

As shown in FIG. 12, the recording apparatus of this embodiment comprises a video signal encoder 1201, an audio signal encoder 1202, a signal change detector 1203, and a recording processor 1
204, recording head 1205, video packer 120
7 and an audio packer 1208, and records it on a recording medium 1206.

The input video signal is encoded by a video signal encoder 1201 to output encoded video data. The encoded video signal is packed into a predetermined size pack by a video packer 1207, and a video pack is output.
Similarly, the audio signal is output from the audio signal encoder 12.
02, the encoded audio data is output, and the audio packer 1208 packs it into a pack of a predetermined size and outputs an audio pack.

The signal change detector 1203 detects a change point of the audio signal as in the third embodiment.

The video packer 1207 and the audio packer 1208 insert a predetermined pack header at the head of the video pack and the audio pack and pack them. The head of the pack and the signal change detector 1203
Each encoded data is packed so that the change point of the audio signal detected by the above is matched.

In the present embodiment in which a pack is recorded and recorded, the pack is an access unit. By matching the head of the pack with the change point of the audio signal, access is possible at the change point of the audio signal.

The method of aligning the position of arbitrary encoded data with the head position of a pack may be such that predetermined stuffing data may be inserted, or the size information described in the pack header or the like may be changed. Good.

When a video signal and an audio signal are recorded in units of titles, the recording process may be continued as different titles at a change point of the audio signal.

In the encoding process for the video signal,
The method of forming and encoding a GOP as a unit for performing the intra-frame encoding process and the inter-frame encoding process has been described. However, the present invention is not limited to this, and the encoding process is performed in units of a plurality of frames (or fields). The same applies to the case where the plurality of frames are considered as a GOP.

In the video signal encoding process, frames are used as a unit. However, a field may be used as a unit, and the same applies to an encoding process using a plurality of fields or a plurality of frames.

[0164]

By recording the point at which the mode of the audio signal changes on the recording medium, it becomes possible to access the mode change point of the audio signal at high speed.

[0165] Further, in the case where audio and video coded data are packed and recorded, by matching the mode change point of the audio signal with the beginning of the pack, it is possible to access the mode change point. By recording the mode change point of the signal on the recording medium, it is possible to access the mode change point at high speed.

Further, by detecting the signal level, spectrum distribution, silence state, etc. of the audio signal, and recording the change point of the audio signal on the recording medium, the change point of the audio signal is accessed at high speed. It becomes possible. Further, by using the change point of the audio signal as an index point, it is possible to specify an index point according to the content of the video signal.

In the case where audio and video encoded data are recorded in the form of a pack, the change point of the audio signal can be accessed by matching the change point of the audio signal with the head of the pack. By recording the change point of the audio signal on the recording medium, the change point of the audio signal can be accessed at high speed.

In encoding a video signal, GOP
When the intra-frame coding and the inter-frame coding are performed in units of, by making the mode change point of the audio signal coincide with the beginning of the GOP, it is possible to access at the mode change point of the audio signal.

In encoding a video signal, GOP
In the case of performing intra-frame encoding and inter-frame encoding processing in units of, and recording audio and video encoded data in a packed form, the beginning of the GOP, the beginning of the pack, and the mode change point of the audio signal should be matched. Thereby, it is possible to access the mode change point of the audio signal.

In encoding a video signal, GOP
In the case of performing intra-frame encoding and inter-frame encoding processing in units of, and recording audio and video encoded data in a packed form, the head of the GOP and the head of the pack are matched with the mode change point of the audio signal, By recording the pack recording position, which is the mode change point, on the recording medium, it becomes possible to access the mode change point of the audio signal at high speed.

In coding a video signal, GOP
When the intra-frame coding and the inter-frame coding processing are performed in units of, the change point of the audio signal and the beginning of the GOP are matched to allow access at the change point of the audio signal.

In encoding a video signal, GOP
In the case of performing intra-frame encoding and inter-frame encoding processing in units of, and recording audio and video encoded data in a packed form, the beginning of the GOP, the beginning of the pack, and the change point of the audio signal are matched. , It is possible to access the changing point of the audio signal.

In encoding a video signal, GOP
When the intra-frame encoding and the inter-frame encoding are performed in units of, and the audio and video encoded data are packed and recorded, the beginning of the GOP and the beginning of the pack coincide with the change point of the audio signal. By recording the pack recording position, which is the transition point, on the recording medium, it becomes possible to access the transition point of the audio signal at high speed.

In the case where audio and video encoded data are recorded in a packed form, the head of the pack and the mode change point of the audio signal are made to coincide with each other, so that
It is possible to access the mode change point of the audio signal.

In the case where audio and video encoded data are packed and recorded, by matching the head of the pack with the change point of the audio signal, it is possible to access the change point of the audio signal. Become.

When a video signal and an audio signal are recorded in units of a title, if the audio signal mode changes, the recording process is continued as a different title, so that the audio signal mode in each title can be the same. In addition, recording and reproduction management becomes easy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a recording apparatus of the present invention.

FIG. 2 is a block diagram showing a recording apparatus according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a third embodiment of the recording apparatus of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the recording apparatus of the present invention.

FIG. 5 is a block diagram showing a recording apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a recording apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a recording apparatus according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing an eighth embodiment of the recording apparatus of the present invention.

FIG. 9 is a block diagram showing a ninth embodiment of the recording apparatus of the present invention.

FIG. 10 is a block diagram showing a tenth embodiment of the recording apparatus of the present invention.

FIG. 11 is a block diagram showing an eleventh embodiment of the recording apparatus of the present invention.

FIG. 12 is a block diagram showing a twelfth embodiment of the recording apparatus of the present invention.

[Explanation of symbols]

101, 201, 301, 401, 501, 601, 7
01,801,901,1001,1101,1201
Video signal encoder 102, 202, 302, 402, 502, 602, 7
02,802,902,1002,1102,1202
Audio signal encoder 103, 203, 503, 603, 703, 1103
Audio mode detector 104, 204, 304, 404, 504, 604, 7
04,804,904,1004,1104,1204
Recording processor 105, 205, 305, 405, 505, 605, 7
05,805,905,1005,1006,110
5,1205 Recording head 106,206,306,406,506,606,7
06,806,906,1006,1106,1206
Recording medium 303, 403, 803, 903 Signal change detector 507, 510, 609, 612, 709, 712, 8
07,810,909,912,1009,1012
Selector 508,610,710,808,910,1010
In-frame encoders 509, 611, 711, 809, 911, 1011
Inter-frame encoders 607, 608, 707, 708, 907, 908, 1
007, 1008, 1107, 1108, 1207, 1
208 Packer 1003, 1203 Level change point detector

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) CJ13 CJ14 CK18 DA01 DA04 DA11 DA15 EA07

Claims (21)

[Claims] An apparatus for recording an audio / video signal on a recording medium, comprising: means for recording an audio signal and a video signal on a recording medium; and means for detecting a signal mode of the audio signal. A recording apparatus for recording information on a recording position of a mode change point at a predetermined position on a recording medium. 2. The recording apparatus according to claim 1, wherein the signal mode of the audio signal includes at least two modes among a monaural mode, a stereo mode, a surround mode, and an audio multiplex mode. Means for encoding the audio signal and the video signal, respectively, wherein the encoded data of the audio signal and the video signal are packed into packs of a predetermined size, and the audio signal and the video signal are packed. 2. The recording apparatus according to claim 1, wherein the pack is multiplexed and recorded on a recording medium, and the pack is packed such that a change point of a mode of the audio signal coincides with a head of the pack. 4. The recording apparatus according to claim 1, wherein a video signal and an audio signal for a predetermined period are recorded as a title, and are recorded as different titles when a mode of the audio signal changes. 5. The recording apparatus according to claim 1, wherein the information on the audio signal mode is recorded at a predetermined position on a recording medium. 6. An apparatus for recording an audio / video signal on a recording medium, comprising: means for recording an audio signal and a video signal on a recording medium; and means for detecting a change point of the audio signal. A recording apparatus for recording information on a recording position at a predetermined position on a recording medium. 7. An audio signal and a video signal are encoded by means of encoding means, respectively, and the encoded data of the audio signal and the video signal are packed into packs of a predetermined size, respectively. 7. The recording apparatus according to claim 6, wherein the pack is multiplexed and recorded on a recording medium, and the pack is packed such that a change point of the audio signal coincides with a head of the pack. 8. An apparatus for recording an audio / video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting audio encoded data; and encoding the video signal to output video encoded data. Video encoding means, means for recording the video encoded data and the audio encoded data on a recording medium, and means for detecting a change point of the signal mode of the audio signal, the video encoding means, One or more frames (hereinafter, or fields) are grouped into a group of pictures (GO)
P), wherein at least one frame of the GOP is subjected to intra-frame encoding processing, the remaining frames are subjected to inter-frame encoding processing, and the mode change point of the audio signal is set at the head of the GOP. Recording device. 9. The recording apparatus according to claim 8, wherein the signal mode of the audio signal includes at least two modes among a monaural mode, a stereo mode, a surround mode, and an audio multiplex mode. 10. A means for packing said audio encoded data into an audio pack of a predetermined size, a means for packing said video encoded data into a video pack of a predetermined size, and said audio pack and said video pack. Multiplexing means for recording the multiplexed data on a recording medium, and packing the audio pack and / or the video pack so that the beginning of either or both of the audio pack and the change point of the audio signal coincide with each other. 9. The recording apparatus according to claim 8, wherein the recording apparatus is used. 11. The recording apparatus according to claim 8, wherein information relating to a recording position of the change point of the audio signal is recorded at a predetermined position on a recording medium. 12. The recording apparatus according to claim 8, wherein a video signal and an audio signal for a predetermined period are recorded as a title, and are recorded as different titles when a mode of the audio signal changes. 13. The recording apparatus according to claim 8, wherein the information relating to the audio signal mode is recorded at a predetermined position on a recording medium. 14. An apparatus for recording an audio video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting audio encoded data;
Video encoding means for encoding a video signal and outputting video encoded data; means for recording the video encoded data and the audio encoded data on a recording medium; and means for detecting a change point of the audio signal. The video encoding means includes one or a plurality of frames (hereinafter, or fields) as a group of pictures (GO).
P), wherein at least one frame of the GOP is subjected to intra-frame encoding processing, the remaining frames are subjected to inter-frame encoding processing, and the change point of the audio signal is set at the beginning of the GOP. apparatus. 15. A means for packing said audio encoded data into an audio pack of a predetermined size, a means for packing said video encoded data into a video pack of a predetermined size, and said audio pack and said video pack. Multiplexing means for recording the multiplexed data on a recording medium, and packing the audio pack and / or the video pack so that the beginning of either or both of the audio pack and the change point of the audio signal coincide with each other. The recording apparatus according to claim 14, wherein the recording apparatus is used. 16. The recording apparatus according to claim 14, wherein information on a recording position of the audio signal with respect to a change point is recorded at a predetermined position on a recording medium. 17. An apparatus for recording an audio video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting encoded audio data;
A video encoding unit that encodes a video signal and outputs video encoded data; a unit that packs the audio encoded data into an audio pack having a predetermined size; and a unit that packs the video encoded data into a video pack having a predetermined size. Means for multiplexing the audio pack and the video pack, means for recording the multiplexed data pack on a recording medium, and means for detecting a change point of the signal mode of the audio signal, A recording apparatus, wherein the head of one or both of the audio pack and the video pack coincides with a signal mode change point of the audio signal. 18. The recording apparatus according to claim 17, wherein the signal mode of the audio signal includes at least two modes among a monaural mode, a stereo mode, a surround mode, and an audio multiplex mode. 19. The recording apparatus according to claim 17, wherein a video signal and an audio signal for a predetermined period are recorded as a title, and are recorded as different titles when the mode of the audio signal changes. 20. A recording apparatus according to claim 17, wherein information relating to said audio signal mode is recorded at a predetermined position on a recording medium. 21. An apparatus for recording an audio video signal on a recording medium, comprising: audio encoding means for encoding an audio signal and outputting encoded audio data;
A video encoding unit that encodes a video signal and outputs video encoded data; a unit that packs the audio encoded data into an audio pack having a predetermined size; and a unit that packs the video encoded data into a video pack having a predetermined size. Means for multiplexing the audio pack and the video pack, means for recording the multiplexed data pack on a recording medium, and means for detecting a change point of an audio signal. And a head of either or both of the video signal and the video pack, and a change point of the audio signal.