JPH11134814A - Audio recording medium and audio reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable audible reproduction of sounds at the time of high-speed reproduction by carrying out multiple recording of audio information for normal reproduction and corresponding audio information for high-speed reproduction into an audio recording medium. SOLUTION: An MPEG encoder 2 of an audio reproducing device includes an MPEG video coding circuit 4a for coding video data, an MPEG audio coding circuit 4b for coding audio information for normal reproduction, and an MPEG high-speed reproduction audio coding circuit 4c for coding audio information for high-speed reproduction. The coding circuits 4a, 4b and 4c operate in parallel and carry out coding at their respective predetermined compression rates. The MPEG high-speed reproduction audio coding circuit 4c compresses information at a compression rate higher than that of the MPEG audio coding circuit 4b. Each of the coded data is written into a memory by a memory controller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio recording medium and an audio reproducing apparatus for reproducing audio such as a television broadcast, and more particularly to a random access audio recording medium and audio recorded on the audio recording medium. The present invention relates to a sound reproducing apparatus for reproducing a sound.

[0002]

2. Description of the Related Art At present, as a device for recording / reproducing television broadcasts or the like, a VTR (Video Ta
pe Recorder) is widely spread. When performing high-speed reproduction using this VTR, the magnetic tape is rotated at a high speed and reproduced.

[0003] When video data and audio data recorded on a random access type recording medium such as a magneto-optical disk are reproduced at a high speed, the video data and audio data recorded on the recording medium are reproduced at intervals. I was doing.

[0004]

However, the above-mentioned VT
In R, the voice reproduced at high speed was not audible.

When audio data recorded on a random access type recording medium is reproduced at high speed, audio data recorded on the recording medium is reproduced step by step. Met.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the invention described in claims 1 to 5 and 11 is to provide a sound capable of reproducing sound so as to be audible during high-speed reproduction. An object of the present invention is to provide an audio recording medium on which data is recorded.

It is an object of the present invention to provide a sound reproducing apparatus capable of reproducing sound so that the sound can be heard in high-speed reproduction.

[0008]

According to the first aspect of the present invention, there is provided an audio recording medium in which audio information for normal reproduction and audio information for high-speed reproduction corresponding thereto are multiplex-recorded.

[0009] Since the normal reproduction audio information and the corresponding high-speed reproduction audio information are multiplex-recorded, it is possible to reproduce the sound so that the user can hear it even during the high-speed reproduction.

An audio recording medium according to a second aspect is the audio recording medium according to the first aspect, wherein the audio recording medium includes video information corresponding to the audio information, and includes audio information for normal reproduction and audio for high-speed reproduction. The information is characterized by being multiplex-recorded substantially in synchronization with the video information.

Since the audio information for normal reproduction and the audio information for high-speed reproduction are multiplexed and recorded in synchronization with the video information, the audio information can be reproduced so as to match the video information.

According to a third aspect of the present invention, there is provided the audio recording medium according to the second aspect, wherein the video information is recorded in a compressed state and includes an independent image and a dependent image. It is characterized by.

Since the video information is recorded as an independent image and a subordinate image, it is possible to easily compress the video information.
Here, for example, in the case of MPEG, the independent image refers to uncompressed video data (key frame) generated for each predetermined frame, and the dependent image refers to video data obtained by a difference from the key frame. . By reproducing only the independent image, high-speed reproduction becomes possible.

According to a fourth aspect of the present invention, there is provided the audio recording medium according to the third aspect, wherein the independent video information and the high-speed reproduction audio information are recorded from a start portion of a recording sector. Features.

Since the independent video information and the audio information for high-speed reproduction are recorded from the start of the recording sector, high-speed reproduction is facilitated by searching for the start of the sector.

According to a fifth aspect of the present invention, there is provided the audio recording medium according to the third or fourth aspect, wherein a start position of a recording sector in which independent video information and high-speed reproduction audio information are recorded is specified. Instruction signal to be recorded.

Since the instruction signal for specifying the start position of the recording sector where the independent video information and the audio information for high-speed reproduction are recorded is recorded, high-speed reproduction is facilitated by reproducing according to the instruction signal.

According to a sixth aspect of the present invention, there is provided an audio reproducing apparatus comprising: an audio recording medium in which normal reproduction audio information and corresponding high-speed reproduction audio information are multiplex-recorded; A reproduction means for reproducing at a speed and a reproduction selecting means for selecting the normal reproduction audio information when the reproduction means performs the normal reproduction and selecting the high-speed reproduction audio information when the reproduction means reproduces at a high speed.

Since the reproduction selecting means selects the normal reproduction audio information at the time of the normal reproduction and selects the high-speed reproduction audio information at the time of the high-speed reproduction, it is easy to switch between the normal reproduction and the high-speed reproduction.

According to a seventh aspect of the present invention, there is provided the audio reproducing apparatus according to the sixth aspect, wherein the audio recording medium includes video information corresponding to the audio information, and includes audio information for normal reproduction and audio for high-speed reproduction. The information is time-division multiplexed and recorded almost in synchronization with the video information. At the time of high-speed reproduction, the video information and the audio information for high-speed reproduction are reproduced at high speed.

At the time of high-speed reproduction, the video information and the audio information for high-speed reproduction are reproduced at high speed, so that the processing at high-speed reproduction becomes easy.

According to an eighth aspect of the present invention, there is provided the audio reproducing apparatus according to the seventh aspect, wherein the video information recorded on the audio recording medium is a compressed video comprising independent video information and subordinate video information. Information, and is characterized in that at the time of high-speed reproduction, independent video information and audio information for high-speed reproduction are selected and reproduced.

Since the video information is composed of independent video information and subordinate video information, it is easy to compress the video information.

An audio reproducing apparatus according to a ninth aspect is the audio reproducing apparatus according to the seventh aspect, wherein the independent video information and the audio information for high-speed reproduction are recorded on the audio recording medium from the start of the recording sector. In high-speed reproduction, independent video information and high-speed reproduction audio information are reproduced from the start of a recording sector.

Since the independent video information and the high-speed reproduction audio information are recorded from the start of the recording sector, the processing at the time of high-speed reproduction becomes easy.

According to a tenth aspect of the present invention, there is provided the audio reproducing apparatus according to the eighth or ninth aspect, wherein the audio recording medium stores independent video information and high-speed reproducing audio information. An instruction signal for specifying the start position of the audio data is recorded, and the reproducing apparatus selects and reproduces the independent video information and the audio information for high-speed reproduction according to the instruction signal.

Since the instruction signal for specifying the start position of the recording sector in which the independent video information and the high-speed reproduction audio information are recorded is recorded, high-speed reproduction is facilitated by reproducing according to the instruction signal.

An audio recording medium according to claim 11 is the audio recording medium according to any one of claims 1 to 5, wherein the audio recording medium is a magneto-optical disk.

Since the audio recording medium is a magneto-optical disk, it can record audio information and video information for a long time.

[0030] An audio reproducing apparatus according to a twelfth aspect is the audio reproducing apparatus according to any one of the sixth to tenth aspects,
The audio recording medium is a magneto-optical disk.

Since the audio recording medium is a magneto-optical disk, it is possible to reproduce audio information and video information for a long time.

[0032]

FIG. 1 is a block diagram showing a schematic configuration of an audio reproducing apparatus according to an embodiment of the present invention.
This audio reproducing apparatus detects a received broadcast wave and converts the received broadcast wave into video information and audio information after signal processing, and an MPEG (Moving) for encoding the video information and audio information output by the tuner 1. Picture Experts G
roup) for temporarily storing the encoded data output from the encoder 2 and the MPEG encoder 2 in a memory (not shown), and reading and outputting the data from the memory in synchronization with the timing of writing to the magneto-optical disk 5 Memory controller 3, an encoder 4 for modulating and outputting write data input from the memory controller 3, a magnetic head 6 for recording data by a magnetic field together with a pickup 7 when writing data, The magnetic disk 5 is irradiated with laser light having a wavelength of 635 nm at a predetermined timing, and information such as data magnetically recorded on the magneto-optical disk 5, a synchronization signal, and a wobble signal based on the physically recorded wobble is transmitted. A pickup 7 for reading, a spindle motor 8 for rotating the magneto-optical disk 5, A head amplifier 9 for amplifying and outputting the high frequency output from the up 7, a decoder 10 for demodulating and outputting data read by the pickup 7, and a video data and an audio data for the data from the decoder 10. A demultiplexer 11 for demultiplexing the video data, an MPEG video demodulation circuit 12 for decoding video data in the MPEG format, an on-screen display circuit 13 for superimposing and outputting video data and character data, and NTSC ( National Television System C
ommittee) video signal or PAL (Phase Altern)
an NTSC / PAL signal generation circuit 14 for generating and outputting a video signal of the ation by line) system, an audio demodulation circuit 15 for demodulating and outputting audio data,
And a time-saving audio circuit 16 for reproducing audio during high-speed reproduction.

When recording video data and audio data on the magneto-optical disk 5, the video information and audio information received by the tuner 1 are encoded by the MPEG encoder 2, and the encoded data is output to the memory controller 3. The memory controller 3 temporarily stores the code data in a memory (not shown). And pickup 7
After the pickup is moved to the track for recording data, the memory controller 3 reads the encoded data from the memory and outputs it to the encoder 4 in synchronization with the timing of writing to the magneto-optical disk 5. The encoder 4 modulates the encoded data, and records the encoded data on the magneto-optical disk 5 by the action of a magnetic field by the magnetic head 6.

When reproducing video data and audio data from the magneto-optical disk 5, after tracking by the pickup 7, the data read by the pickup 7 is output to the decoder 10 via the head amplifier 9 and the decoder 10 demodulates the data. The demultiplexer 11 separates the encoded data demodulated by the decoder 10 into video data and audio data and outputs the video data and the audio data. The MPEG video demodulation circuit 12 decodes and outputs the video data output from the demultiplexer 11. The video data is stored in the on-screen display circuit 1
3, character data is superimposed, and NTSC / PA
The signal is converted into an NTSC video signal or a PAL video signal by the L signal generation circuit 14 and output. Further, the audio demodulation circuit 15 includes the demultiplexer 11.
The demodulated audio data is demodulated and output.

FIGS. 2 and 3 are views for explaining the file structure of the magneto-optical disk according to the present embodiment. As shown in FIG. 2, a directory area is provided in the first recording area of the magneto-optical disk 5, and the directory area has a file name of each file,
Usage status, creation date and time, file capacity, FAT (File Allocation Table) number of the first data, and the like are recorded. A FAT area is provided next to the directory area, and information on which area in the data area each file is recorded is recorded. A data area is provided next to the FAT area, and a total of n 2 kB areas (sectors) are provided.

As shown in FIG. 3, when video 1 is recorded, a directory related to video 1 is recorded in the first area of the directory area. Video 1 "F of the first data
By referring to the "AT number", it can be understood that information of 2 kB of the first video data is recorded in the data area corresponding to the FAT number "1". It can be seen from the reference that the subsequent 2 kB information is recorded in the data area corresponding to the FAT number “2.” As described above, by sequentially referring to the contents of the FAT area, the information of 7 kB becomes 4 It can be seen that the data is recorded in two data areas.

FIG. 4 is a diagram for explaining the MPEG encoder 2 in further detail. MPEG encoder 2
Is an MPEG video encoding circuit 4a for encoding video data, an MPEG audio encoding circuit 4b for encoding normal reproduction audio information, and an MPEG high-speed encoding circuit for encoding high-speed reproduction audio information. And a reproduction audio encoding circuit 4c.

MPEG video encoding circuit 4a and MPEG
The audio encoding circuit 4b and the audio encoding circuit for MPEG high-speed reproduction 4c operate in parallel, and perform encoding at a predetermined compression ratio. MPEG high-speed playback audio encoding circuit 4c
Are compressed at a higher compression ratio than the MPEG audio encoding circuit 4b, and each encoded data is written to the memory by the memory controller 3.

For example, when recording video data on the magneto-optical disk 5 by 5 sectors and audio data by 1 sector, the data structure shown in FIG. 5 is used. The area 1 is composed of 60 sectors, and includes 10 video data composed of 5 sectors and 10 audio data composed of 1 sector. After recording the video data and the audio data in the area 1, the compressed audio data encoded by the audio encoding circuit 4c for MPEG high-speed reproduction is recorded for one sector. That is, the compressed audio data is compressed and recorded at a compression rate 10 times that of the normal audio data.

As will be described later, at the time of high-speed reproduction, only the key frames of the video compression data are sequentially reproduced, and the video data is reproduced at a high speed. There is a need. This processing is mainly performed by a CPU (Central
sing Unit).

The instruction signal area in the data structure shown in FIG. 5 includes information on the start position of the recording sector of video data, the start position of the recording sector of audio data, and information on the compressed audio data (recording sector start position, compression ratio, Information on whether the data is arranged in sector units, etc.), the ratio between video data and audio data, and the compression ratio between video data and audio data are recorded. This instruction signal area is recorded in a predetermined sector, and is referred to during reproduction. For example, by recording the instruction signal area so that it is always located before the key frame and recording the key frame in the sector immediately after that, processing at the time of high-speed reproduction becomes easy. That is,
If the instruction signal area is detected at the time of high-speed reproduction and only the key frame immediately after that is reproduced, high-speed reproduction of video data can be performed.

During normal reproduction, the MPEG video demodulation circuit 12
And the audio demodulation circuit 15
The video data and the audio data separated by 1 are demodulated and reproduced. At this time, the demultiplexer 11 can separate the video data and the audio data by extracting the instruction signal area.

During high-speed reproduction, the MPEG video demodulation circuit 12
Reproduces and outputs only the key frames of the video data separated by the demultiplexer 11. At this time,
The demultiplexer 11 extracts the instruction signal area and outputs only the key frame to the MPEG video demodulation circuit 12. The demultiplexer 11 detects the position of the sector where the compressed audio data is recorded based on the information recorded in the instruction signal area, and outputs only the compressed audio data to the time-saving audio circuit 16. Since the time stamp corresponding to the compressed audio data corresponds to the time when only the key frame is reproduced, the high-speed audio can be reproduced in synchronization with the video simply by decoding.

In the present embodiment, video information is also recorded, but only normal reproduction audio information and high-speed reproduction audio information may be recorded. Further, in the present embodiment, a description has been given using a magneto-optical disk, but a recording medium such as a magnetic tape for simultaneously recording video information and audio information may be used. Further, in the present embodiment, the video information is M
Although compression is performed by the PEG method, compression may be performed by another method, and the video information may be an analog video signal instead of a digital signal.

[0045]

According to the audio recording medium of the first aspect, since the normal reproduction audio information and the corresponding high-speed reproduction audio information are multiplex-recorded, the audio is recorded so that the user can hear it even during the high-speed reproduction. It becomes possible to reproduce.

According to the audio recording medium of claim 2,
Since the audio information for normal reproduction and the audio information for high-speed reproduction are multiplexed and recorded in synchronization with the video information, the audio information can be reproduced so as to match the video information.

According to the audio recording medium of claim 3,
Since the video information is recorded as the independent image and the subordinate image, the video information can be easily compressed.

According to the audio recording medium of the fourth aspect,
Since the independent video information and the high-speed reproduction audio information are recorded from the start of the recording sector, high-speed reproduction is facilitated by searching for the start of the sector.

According to the audio recording medium of claim 5,
Since the instruction signal for specifying the start position of the recording sector in which the independent video information and the high-speed reproduction audio information are recorded is recorded, high-speed reproduction is facilitated by reproducing according to the instruction signal.

According to the sound reproducing apparatus of claim 6,
Since the reproduction selecting means selects the normal reproduction audio information at the time of the normal reproduction, and selects the high-speed reproduction audio information at the time of the high-speed reproduction, it is easy to switch between the normal reproduction and the high-speed reproduction.

According to the sound reproducing apparatus of the seventh aspect,
At the time of high-speed reproduction, the video information and the audio information for high-speed reproduction are reproduced at high speed, so that the processing at high-speed reproduction becomes easy.

According to the audio reproducing apparatus of claim 8,
Since the video information is composed of the independent video information and the dependent video information, it is easy to compress the video information.

According to the ninth aspect of the audio reproducing apparatus,
Since the independent video information and the high-speed reproduction audio information are recorded from the start of the recording sector, the processing at the time of high-speed reproduction is facilitated.

According to the audio reproducing apparatus of the tenth aspect, since the instruction signal for specifying the start position of the recording sector in which the independent video information and the audio information for high-speed reproduction are recorded is recorded, the reproduction is performed according to the instruction signal. By doing so, high-speed reproduction becomes easy.

According to the audio recording medium of the present invention, since the audio recording medium is a magneto-optical disk, it is possible to record audio information and video information for a long time.

According to the audio reproducing apparatus of the twelfth aspect, since the audio recording medium is a magneto-optical disk, it is possible to reproduce audio information and video information for a long time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an audio reproduction device according to an embodiment of the present invention.

FIG. 2 is a diagram (part 1) for explaining a file structure of a magneto-optical disk according to the embodiment;

FIG. 3 is a diagram (part 2) for explaining the file structure of the magneto-optical disk according to the embodiment;

FIG. 4 is a diagram for explaining the MPEG encoder 2 in further detail;

FIG. 5 is a diagram showing a data structure of data recorded by the audio reproducing device according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuner 2 MPEG encoder 3 Memory controller 4 Encoder 5 Magneto-optical disk 6 Magnetic head 7 Pickup 8 Spindle motor 9 Head amplifier 10 Decoder 11 Demultiplexer 12 MPEG video demodulation circuit 13 On-screen display circuit 14 NTSC / PAL signal generation circuit 15 Audio demodulation Circuit 16 Audio reduction circuit

Claims (12)

[Claims] 1. An audio recording medium in which normal reproduction audio information and corresponding high-speed reproduction audio information are multiplex-recorded. 2. The audio recording medium includes video information corresponding to audio information, and the normal reproduction audio information and the high-speed reproduction audio information are multiplex-recorded substantially in synchronization with the video information, respectively. The audio recording medium according to claim 1, wherein: 3. The audio recording medium according to claim 2, wherein said video information is recorded in a compressed state, and includes an independent image and a dependent image. 4. The audio recording medium according to claim 3, wherein the independent video information and the high-speed reproduction audio information are recorded from a start portion of a recording sector. 5. The audio recording medium according to claim 3, wherein an instruction signal for specifying a start position of a recording sector in which the independent video information and the high-speed reproduction audio information are recorded is recorded. 6. An audio recording medium in which audio information for normal reproduction and audio information for high-speed reproduction corresponding thereto are multiplex-recorded, reproduction means for reproducing the recording medium at different reproduction speeds of normal reproduction and high-speed reproduction, An audio reproducing apparatus comprising: a reproduction selecting unit that selects the normal reproduction audio information when the reproduction unit performs normal reproduction; and a reproduction selection unit that selects the high-speed reproduction audio information when the reproduction unit performs high-speed reproduction. 7. The audio recording medium includes video information corresponding to audio information, and the normal reproduction audio information and the high-speed reproduction audio information are time-division multiplexed and recorded substantially in synchronization with the video information, respectively. 7. The audio reproducing apparatus according to claim 6, wherein the video information and the audio information for high-speed reproduction are reproduced at high speed during high-speed reproduction. 8. The video information recorded on the audio recording medium is compressed video information including independent video information and subordinate video information, and at the time of high-speed reproduction, the independent video information and the high-speed reproduction audio information 8. The sound reproducing apparatus according to claim 7, wherein said sound reproducing apparatus selects and reproduces the selected sound. 9. The audio recording medium has the independent video information and the high-speed reproduction audio information recorded from the start of a recording sector. When the high-speed reproduction is performed, the independent video information and the high-speed reproduction audio information are recorded. 8. The audio reproducing apparatus according to claim 7, wherein information is reproduced from a start portion of a recording sector. 10. An instruction signal for specifying a start position of a recording sector in which the independent video information and the audio information for high-speed reproduction are recorded is recorded on the audio recording medium, and the reproducing apparatus transmits the instruction signal. 10. The audio reproducing apparatus according to claim 8, wherein the independent video information and the high-speed reproduction audio information are selected and reproduced according to a signal. 11. The audio recording medium according to claim 1, wherein the audio recording medium is a magneto-optical disk. 12. The audio reproducing apparatus according to claim 6, wherein said audio recording medium is a magneto-optical disk.