JP2002298556A - Device for recording sound signal, device for reproducing sound signal and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound signal recorder capable of recording a multiplex mode information of a sound signal and recording the sound signal in a format that can be reproduced by a sound signal reproducing device which does not refer to the multiplex mode information on a recording medium. SOLUTION: A multiplex mode discriminating part 2 discriminates a multiplex mode from a multiplex sound signal and prepares multiplex mode information. Otherwise, a multiplex mode information inputting part inputs multiplex mode information from the outside apart from the multiplex sound signal. A recording part 6 makes a sound signal for recording from a sound signal for recording generating part 5 to be a sound signal for recording file 8 and on the other hand, makes the multiplex mode information to be a multiplex mode information file 9 apart from the file 8. The recording part 6 records both the files on a DVD-R 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an audio signal recording device,
Regarding an audio signal reproducing device and an audio signal recording medium,
The present invention relates to a method for handling audio signals of audio multiplex broadcasting such as bilingual broadcasting and stereo broadcasting in accordance with a multiplex system.

[0002]

2. Description of the Related Art As a device for recording or reproducing a video signal and an audio signal of a television (TV) broadcast or the like, a video tape recorder (VTR) or a video cassette recorder is used.
(VCR) was conventionally common. In a VTR, a magnetic tape was a recording medium.

On the other hand, in addition to a VTR as a video signal and audio signal reproducing device, a DVD player has begun to spread in recent years. DVD (Digital Versatile D)
An optical disk called isc) is a recording medium for video signals and audio signals. The DVD video standard is defined for an apparatus such as a DVD player that plays only a DVD.

[0004] DVDs have the following advantages over magnetic tapes. First, the size of a DVD is, for example, about 12 cm in diameter and about 1 mm in thickness, which is smaller than a magnetic tape. Even with such a small size, a DVD has a capacity as large as a magnetic tape. For example, in the DVD video standard,
The DVD can record about 4.7 Gbytes of video signals, audio signals, and the like. This data amount is equivalent to an average movie, that is, video and audio for a time of about 135 minutes. As described above, the DVD can record the video signal and the audio signal for a sufficient time at a high density with the small size. Therefore, D
VD can save storage space compared to a magnetic tape of the same data amount.

Next, the data format of the DVD video standard is common to DVD-ROM which is a data recording medium for a personal computer (personal computer). Therefore, the video recorded on the DVD can be reproduced on the display of the personal computer by the DVD-ROM drive of the personal computer. In addition to the above advantages, a DVD can perform random access for each title of a recorded video at a higher speed than a magnetic tape. Because of the advantages described above, DVD is expected as a recording medium for video and audio replacing magnetic tape.

In a VTR, both recording and reproduction of data are possible. However, DVD players can only reproduce data. It is desirable for a user to be able to record video and audio on a DVD by himself. In particular, like a conventional VTR, a TV broadcast program is
It is desirable to be able to record on VD. Therefore, DVD-R, DV,
D-RAM and DVD-RW have been developed. DVD
-R is a DVD on which data can be recorded only once. DV
The D-RAM and DVD-RW are DVDs whose data can be rewritten a plurality of times. Furthermore, these recordable DVs
A DVD video camera capable of recording video and audio on D and a DVD video recorder capable of recording a TV broadcast program have been developed.

[0007] DVD video cameras and DVD video recorders are based on the DVD video recording standard instead of the read-only DVD video standard. The DVD video recording standard differs from the DVD video standard in various ways. In particular, the format of the audio signal differs as described below.

In the DVD video standard, a video signal and an audio signal are recorded as a video stream and an audio stream, respectively. In the DVD video standard, a multiplexing method (also referred to as a multiplex mode) of an audio signal recorded in an audio stream is called an audio attribute of the audio stream. The audio attributes include, for example, monaural (1 channel), stereo (2 channels), dual monaural (2 channels) such as bilingual broadcasting, and 5.1 channel surround (6 channels).

In the DVD video standard, the audio attribute of one audio stream is limited to one type in one title. Therefore, in the DVD video standard, the audio attribute must not be changed in the middle of one title. For example, switching from stereo to dual monaural should not be performed on the same audio stream. Therefore, a DVD player conforming to the DVD video standard changes the multiplexing method of the reproduced audio signal within one title as follows. When authoring a DVD, two or more audio streams are recorded for one title. The audio attributes of each audio stream are different from each other. One of those audio streams is switched in accordance with the reproduction of the video signal. Thereby, D
The VD player can change the multiplexing method of the reproduced audio signal within one title.

[0010] Furthermore, recording of a plurality of audio streams for one title as described above also has the following advantages. For example, when recording a movie on a DVD, dialogue is recorded in a plurality of languages, such as English, Japanese, and French. Each language is recorded in a separate audio stream. In this way, a movie recorded on the same DVD can be viewed by selecting one of languages from a plurality of countries.

In the DVD video recording standard, D
Unlike the VD video standard, one audio stream may have a plurality of audio attributes in one title. This is because, in the data format defined by the DVD video recording standard, for example, information about when and how the audio signal multiplexing system changes in an audio stream (hereinafter, audio signal multiplexing system information). Is recorded in real time. As a result, in the DVD video recording standard, the multiplexing method of the audio signal can be changed in real time in the middle of the title based on the multiplexing method information.

[0012]

As described above, users can record on DVDs themselves, and DVD recorders and the like that conform to the DVD video recording standard have begun to spread rapidly. Accompanying this, DVDs that record video signals and audio signals in accordance with the DVD video recording standard, such as DVDs recorded by DVD recorders, are increasing. However, these DVDs cannot be reproduced by a DVD player conforming to the conventional DVD video standard due to the difference in the format of the audio signal as described above.

Accordingly, the present invention relates to an audio signal recording apparatus capable of recording multiplex method information of an audio signal, wherein the audio signal can be recorded on a recording medium in a format that can be reproduced by an audio signal reproducing apparatus that does not refer to the multiplex method information. A recording device is provided. If such an audio signal recording device complies with, for example, the DVD video recording standard, the DVD recorded by the audio signal recording device can
The audio signal reproducing device conforming to the DVD video standard as well as the audio signal reproducing device conforming to the VD video recording standard can be reproduced.

[0014]

According to the present invention, there is provided an audio signal recording apparatus comprising: at least one multiplex audio signal input unit for inputting at least one multiplex audio signal from the outside; A multiplexing method determining unit for determining the multiplexing method of the input multiplexed audio signal and outputting the result of the determination as multiplexing method information, or (b)
A multiplexing method information input unit for externally inputting multiplexing method information of the multiplexed audio signal; separating and extracting a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input unit; An audio signal extraction unit for outputting as a plurality of extracted audio signals; an input audio signal including the extracted audio signal; inputting at least one of the input audio signals as an output audio signal; A switch for switching a signal in accordance with a predetermined input; a recording audio signal generation unit for generating a recording audio signal based on the output audio signal from the switch; and a recording audio signal and the multiplexing method. A recording unit for recording information and a file as separate files on a recording medium.

Here, audio signal multiplexing methods include, for example, monaural (1 channel), stereo (2 channels), dual monaural (2 channels) such as bilingual broadcasting, and the like.
Includes 5.1 channel surround (6 channels).

In the above-described audio signal recording apparatus, a file of the multiplex system information of the audio signal can be recorded as a file different from the audio signal. Therefore, when reproducing the audio signal recorded by the audio signal recording device, the audio signal reproducing device can select whether or not to refer to the multiplex method information.

For example, if the above audio signal recording device is a DVD
It is assumed that the terminal supports the video standard. In that case,
The data structure of the audio signal and the like recorded by the audio signal recording device described above has a portion not defined by the DVD video standard, that is, a multiplex format information file, in addition to the portion defined by the DVD video standard. However, the audio signal reproducing device conforming to the DVD video standard can prevent the multiplexing format information file from being referred to when reproducing the audio signal. Therefore, the audio signal reproducing device conforming to the DVD video standard can reproduce the audio signal recorded by the above-described audio signal recording device without extending the conventional configuration.

In the above-described audio signal recording apparatus, the multiplexing system information is determined from the multiplexed audio signal input by the multiplexing system determining unit, or is externally input through the multiplexing system information input unit. Here, the input of the multiplexing system information by the multiplexing system information input unit includes, for example, a case where the multiplexing system information of the multiplexed audio signal is received in a packet different from the multiplexed audio signal through network communication. In that case, the multiplexed audio signal does not need to include the multiplexing scheme information.

The audio signal recording device converts the format of the input audio signal to the switch before inputting the signal to the switch, aligns the signal to a predetermined format, and outputs the signal to the switch. Unit may be further provided. In such an audio signal recording device, when the format of the input multiplexed audio signal changes during recording, or when there are a plurality of multiplexed audio signals and the respective formats are different, the format conversion unit The format of the audio signal input to the generation unit can be converted to a common format. Therefore, the recording audio signal generation unit can easily adjust the format of the recording audio signal. Therefore, even if the audio signal reproducing apparatus limits the format of the audio signal to one type in one title such as the DVD video standard, the audio signal recorded by the audio signal recording apparatus can be reproduced. .

Here, the title means the entire multiplex audio signal input to the audio signal recording device from the start to the end of recording. The user operates a mechanical switch such as a button to start and end recording of the multiplexed audio signal in real time. Alternatively, the user sets the recording start and end times in the audio signal recording device before the recording starts. The above audio signal recording device automatically starts and ends recording at each time.

The above-mentioned audio signal recording apparatus further includes an audio signal synthesizing section for synthesizing a synthesized audio signal based on the extracted audio signal, wherein the input audio signal to the switch converts the synthesized audio signal. In addition, it may be included. In such an audio signal recording device, a synthesized audio signal can be newly synthesized from the input multiplexed audio signal. Thus, for example, when the channel of the input multiplexed audio signal decreases during recording, the above-described audio signal recording device synthesizes the synthesized audio signals of the same number of channels as the reduced channels and adds the synthesized audio signal to the original multiplexed audio signal. it can. Therefore, the number of channels of the recording audio signal can be made constant in one file. Therefore, the audio signal recorded by the audio signal recording apparatus can be reproduced even if the audio signal reproducing apparatus limits the number of channels of the audio signal within one title as in the DVD video standard, for example.

In the above-described audio signal recording apparatus according to the present invention, the recording audio signal generating section may include a high-efficiency encoding section for performing high-efficiency encoding on the output audio signal. Thus, the above-described audio signal recording device can reduce the information amount of the recording audio signal as compared with the input multiplexed audio signal. As a result, the above-described audio signal recording apparatus can record a multiplex audio signal on a recording medium at a high density.

The recording section includes a temporary storage section for temporarily storing the multiplexing system information, and after recording one of the files of the recording audio signal on the recording medium, The audio signal recording apparatus according to the present invention may be characterized in that the corresponding multiplexing method information is read out from the temporary storage unit and recorded on the recording medium as a file separate from the recording audio signal. In such an audio signal recording device, the recording unit can continuously record one of the files of the audio signal for recording without substantial interruption. In particular, in the physical format on the recording medium, the recording area of the recording audio signal for each file can be made substantially continuous. That is, for example, a video signal, a sub-picture (sub-picture) signal, a synchronization signal, an address information and an error correction code on a recording medium, and the like, except that a recording area for data other than multiplexing information is interposed therebetween. The recording area of the recording audio signal for each file can be continuous. Therefore, even if the audio signal reproducing apparatus continuously reproduces an audio signal recorded in a substantially continuous recording area on a DVD such as a DVD-R, the above-described audio signal recording is performed. The audio signal recorded by the device can be reproduced.

The data temporarily stored in the temporary storage section is preferably multiplex system information, not a recording audio signal. This is because the amount of information of the multiplex method information is considerably smaller than that of the recording audio signal, so that the capacity of the temporary storage unit can be reduced.

The recording apparatus according to the present invention is characterized in that the recording unit records the recording audio signal included in one file in a substantially continuous recording area on the recording medium. It is good. One file of the recording audio signal is recorded in a substantially continuous recording area on the recording medium. Therefore, even if the audio signal reproducing apparatus continuously reproduces an audio signal from a substantially continuous recording area on a DVD, such as a DVD-R, the audio signal for recording is continuously reproduced. Can be played back. Furthermore,
In the above-described audio signal recording device, the recording unit can record the recording audio signal on the recording medium at a substantially constant recording speed.
Therefore, recording of the recording unit can be easily controlled. In addition, continuous reproduction of the audio signal recorded by the audio signal recording device can be facilitated.

The above-described audio signal recording apparatus according to the present invention comprises:
The recording audio signal and the multiplexing method information further includes a temporary recording medium for temporarily recording, the recording unit temporarily records the recording audio signal and the multiplexing method information on the temporary recording medium, Thereafter, the data may be transferred from the temporary recording medium to the recording medium and recorded as separate files. Thus, the recording audio signal and the multiplex method information can be temporarily recorded on the temporary recording medium when the above-mentioned audio signal recording device is not loaded with the recording medium. The recording audio signal and the multiplex method information temporarily recorded on the temporary recording medium can be recorded on the recording medium at an appropriate time.

[0027] The temporary recording medium may be a semiconductor memory. The semiconductor memory can write data at a higher speed than a general recording medium for recording an audio signal, such as a DVD. Therefore, it can be used as the following buffer at the time of recording by the recording unit. Generally, the processing speed of data such as creation of a file by the recording unit is faster than the speed of writing data to the recording medium. Therefore, the data is recorded on the temporary recording medium until the data is written on the recording medium after the processing such as the creation of the file, thereby compensating for the speed difference.
In addition, when the amount of information such as a recording audio signal exceeds the capacity of a recording medium, data can be recorded on a temporary recording medium instead of the recording medium.

Alternatively, the temporary recording medium may be a hard disk. The hard disk has a large capacity which is equal to or larger than that of a general recording medium, such as a DVD, for recording an audio signal. Therefore, in the above-described audio signal recording apparatus, the entire file of the recording audio signal can be temporarily recorded on the hard disk before recording on the recording medium. Therefore, for example, the entire file of the recording audio signal is reproduced from the hard disk by an appropriate audio signal reproducing device,
The entire reproduced sound can be confirmed before recording on the recording medium.

[0029] The audio signal recording apparatus according to the present invention may be characterized in that the predetermined input to the switch includes the multiplexing system information. If the multiplex method information is an output from the multiplex method discriminating unit, the switch can determine a change of the multiplex method from the multiplex method information in real time, and can switch and output the output audio signal in real time. Therefore, the recording audio signal generation unit and the recording unit can continuously process the audio signal without interruption when changing the multiplexing method. As a result, the entire file of the recording audio signal is continuously recorded on the recording medium regardless of the change of the multiplexing method.

When the multiplexing system information included in the predetermined input to the switch is an output from the multiplexing system information input unit, for example, the switch inputs the multiplexing system information corresponding to the input audio signal before the input audio signal. it can. Thereby,
After the change of the multiplexing method is determined in advance, the output audio signal can be switched and output in real time according to the determination result. Therefore, the recording audio signal generation unit and the recording unit can continuously process the audio signal without interruption when changing the multiplexing method. As a result, the entire file of the recording audio signal is continuously recorded on the recording medium regardless of the change of the multiplexing method.

(A) The recording audio signal generation unit comprises:
A digital signal processing unit for performing predetermined digital signal processing on the output audio signal from the switch;
And (b) a synchronization signal generator for generating a synchronization signal in synchronization with the digital signal processing; and (B) the switch switches the output audio signal in synchronization with the synchronization signal. That is, the above-described audio signal recording apparatus according to the present invention may be characterized.

In the above audio signal recording device, when the switch is outputting a plurality of output audio signals, the output audio signals can be simultaneously switched. Therefore, it is possible to prevent the audio signal of a certain channel from being left in the output audio signal without being switched and mixed as noise in the recording audio signal. Further, the switch can switch the output audio signal in synchronization with the digital signal processing of the recording audio signal generation unit. Therefore, it is possible to avoid that a part of one recording audio signal is lost and mixed with the other recording audio signal before and after the switch 4 is switched during digital signal processing by the recording audio signal generation unit. As a result, it is possible to avoid that noise due to a shift in synchronization between the switching of the switch 4 and the digital signal processing is included in the reproduced sound.

The above-described audio signal recording apparatus according to the present invention comprises:
For either or both of the input audio signal and the output audio signal, in response to the predetermined input to the switch, (a) perform fade-out before switching the output audio signal by the switch, b) a fade unit for fading in the input audio signal after switching the output audio signal by the switch. As a result, the volume of the reproduced sound can be gradually reduced before a portion corresponding to switching of the output sound signal by the switch, and gradually increased after the portion. As a result, it is possible to avoid that the reproduced sound is interrupted unnaturally, that the volume of the reproduced sound is changed discontinuously, and that noise is included at a portion corresponding to the time when the output audio signal is switched by the switch.

The above-described audio signal recording apparatus according to the present invention comprises:
For either or both of the input audio signal and the output audio signal, according to the predetermined input to the switch, (a) set a mute when the output audio signal is switched by the switch, b) The apparatus may further include a mute unit for canceling the mute after the output audio signal is switched by the switch. As a result, the volume of the reproduced sound can be rapidly reduced at a portion corresponding to the time when the output audio signal is switched by the switch, and quickly restored after the portion. In this case, it is possible to prevent a rapid change in the volume from being heard from the reproduced sound. As a result, it is possible to avoid that the reproduced sound is interrupted unnaturally, that the volume of the reproduced sound is changed discontinuously, and that noise is included at a portion corresponding to the time when the output audio signal is switched by the switch.

An audio signal recording apparatus according to another aspect of the present invention comprises: at least one multiplex audio signal input unit for externally inputting at least one multiplex audio signal; (a) the multiplex audio signal input unit A multiplexing method discriminating unit for discriminating a multiplexing method of the multiplexed audio signal input to, and outputting the result of the discrimination as multiplexing method information, or (b)
A multiplexing method information input unit for externally inputting multiplexing method information of the multiplexed audio signal; separating and extracting a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input unit; An audio signal extraction unit for outputting as a plurality of extracted audio signals; an audio signal temporary storage unit for temporarily storing an input audio signal including the extracted audio signal;
A recording audio for reading out, as an output audio signal, a signal specified by the multiplexing method information from the input audio signals stored in the audio signal temporary storage unit, and generating a recording audio signal from the output audio signal. Signal generator;
And a recording unit for recording the recording audio signal and the multiplexing system information as separate files on a recording medium.

Here, the audio signal multiplexing method includes, for example, monaural (1 channel), stereo (2 channels), dual monaural (2 channels) such as bilingual broadcasting, and the like.
Includes 5.1 channel surround (6 channels).

In the above-described audio signal recording apparatus, a file of the multiplex system information of the audio signal can be recorded as a file separate from the audio signal. Therefore, when reproducing the audio signal recorded by the audio signal recording device, the audio signal reproducing device can select whether or not to refer to the multiplex method information.

For example, if the above audio signal recording device is a DVD
It is assumed that the terminal supports the video standard. In that case,
The data structure of the audio signal and the like recorded by the audio signal recording device described above has a portion not defined by the DVD video standard, that is, a multiplex format information file, in addition to the portion defined by the DVD video standard. However, the audio signal reproducing device conforming to the DVD video standard can prevent the multiplexing format information file from being referred to when reproducing the audio signal. Therefore, the audio signal reproducing device conforming to the DVD video standard can reproduce the audio signal recorded by the above-described audio signal recording device without extending the conventional configuration.

In the above-described audio signal recording apparatus, the multiplexing system information is determined from the multiplexed audio signal input by the multiplexing system determining unit, or is externally input through the multiplexing system information input unit. Here, the input of the multiplexing system information by the multiplexing system information input unit includes, for example, a case where the multiplexing system information of the multiplexed audio signal is received in a packet different from the multiplexed audio signal through network communication. In that case, the multiplexed audio signal does not need to include the multiplexing scheme information.

The above-described audio signal recording apparatus according to the present invention comprises:
Preferably, it is included in a personal computer. In that case, for example, the multiplexed audio signal input unit, one of the multiplexed format determination unit or the multiplexed format information input unit, and the audio signal extraction unit may be included in peripheral devices such as a capture board and a tuner board. The audio signal temporary storage unit may be a main memory such as a RAM. Further, the CPU may function as a recording audio signal generation unit. The recording unit is preferably a DVD-R drive, a DVD-RAM drive,
VD-RW drive, CD-R drive and CD-RW
An optical disk drive such as a drive. in this way,
In the audio signal recording device according to the present invention, even when the audio signal extraction unit and the recording audio signal generation unit are formed on different substrates, they can be linked via the audio signal temporary storage unit.

The above audio signal recording device reads out the extracted audio signal from the audio signal temporary storage unit, performs digital signal processing, and stores the digital audio signal as a part of the input audio signal in the temporary audio storage unit. A signal processing unit may be further provided. In such an audio signal recording device, a new audio signal can be generated from the extracted audio signal by digital signal processing. Thereby, for example, when the channel of the input multiplexed audio signal decreases during recording, the above-described audio signal recording device can generate the audio signal of the same number of channels as the reduced channel and add it to the original multiplexed audio signal. . Therefore, the number of channels of the recording audio signal can be made constant within one file. Therefore, the audio signal recorded by the audio signal recording apparatus can be reproduced even if the audio signal reproducing apparatus limits the number of channels of the audio signal within one title as in the DVD video standard, for example.

In the above-described audio signal recording apparatus according to the present invention, the recording audio signal generating section may include a high-efficiency encoding section for performing high-efficiency encoding on the output audio signal. Such an audio signal recording device can reduce the amount of information of an audio signal for recording as compared with an input multiplexed audio signal. As a result, the above-described audio signal recording apparatus can record a multiplex audio signal on a recording medium at a high density.

The recording section includes a temporary storage section for temporarily storing the multiplexing system information, and after recording one of the files of the recording audio signal on the recording medium, the recording audio signal is temporarily stored in the recording medium. The audio signal recording apparatus according to the present invention may be characterized in that the corresponding multiplexing method information is read out from the temporary storage unit and recorded on the recording medium as a file separate from the recording audio signal. In such an audio signal recording device, the recording unit can continuously record one of the files of the audio signal for recording without substantial interruption. In particular, in the physical format on the recording medium, the recording area of the recording audio signal for each file can be made substantially continuous. That is, for example, a video signal, a sub-picture (sub-picture) signal, a synchronization signal, an address information and an error correction code on a recording medium, and the like, except that a recording area for data other than multiplexing information is interposed therebetween. The recording area of the recording audio signal for each file can be continuous. Therefore, even if the audio signal reproducing apparatus continuously reproduces an audio signal recorded in a substantially continuous recording area on a DVD such as a DVD-R, the above-described audio signal recording is performed. The audio signal recorded by the device can be reproduced.

The data temporarily stored in the temporary storage section is preferably multiplex system information, not a recording audio signal. This is because the amount of information of the multiplex method information is considerably smaller than that of the recording audio signal, so that the capacity of the temporary storage unit can be reduced.

It is preferable that the recording section records the recording audio signal included in one file in a substantially continuous recording area on the recording medium. It may be a feature. One file of the recording audio signal is recorded in a substantially continuous recording area on the recording medium. Therefore, even if the audio signal reproducing apparatus continuously reproduces an audio signal from a substantially continuous recording area on a DVD such as a DVD-R, the recording audio signal is continuously output. Can be played. Furthermore,
In the above-described audio signal recording device, the recording unit can record the recording audio signal on the recording medium at a substantially constant recording speed.
Therefore, recording of the recording unit can be easily controlled. In addition, continuous reproduction of the audio signal recorded by the audio signal recording device can be facilitated.

The above-described audio signal recording apparatus according to the present invention comprises:
The recording audio signal and the multiplexing method information further includes a temporary recording medium for temporarily recording, the recording unit temporarily records the recording audio signal and the multiplexing method information on the temporary recording medium, Thereafter, the data may be transferred from the temporary recording medium to the recording medium and recorded as separate files. Such an audio signal recording apparatus can temporarily record an audio signal for recording and multiplex system information on a temporary recording medium when a recording medium is not mounted. The recording audio signal and the multiplex method information temporarily recorded on the temporary recording medium can be recorded on the recording medium at an appropriate time.

The temporary recording medium may be a semiconductor memory. The semiconductor memory can write data at a higher speed than a general recording medium for recording an audio signal, such as a DVD. Therefore, it can be used as the following buffer at the time of recording by the recording unit. Generally, the processing speed of data such as creation of a file by the recording unit is faster than the speed of writing data to the recording medium. Therefore, the data is recorded on the temporary recording medium until the data is written on the recording medium after the processing such as the creation of the file, thereby compensating for the speed difference.
In addition, when the amount of information such as a recording audio signal exceeds the capacity of a recording medium, data can be recorded on a temporary recording medium instead of the recording medium.

Alternatively, the temporary recording medium may be a hard disk. The hard disk has a large capacity which is equal to or larger than that of a general recording medium, such as a DVD, for recording an audio signal. Therefore, in the above-described audio signal recording apparatus, the entire file of the recording audio signal can be temporarily recorded on the hard disk before recording on the recording medium. Therefore, for example, the entire file of the recording audio signal is reproduced from the hard disk by an appropriate audio signal reproducing device,
The entire reproduced sound can be confirmed before recording on the recording medium.

When the output audio signal is switched according to the multiplexing system information, (a) the output audio signal before the switching is subjected to fade-out processing, and (b)
The audio signal recording device according to the present invention may be characterized in that the recording audio signal generation unit includes a fade unit for performing a fade-in process on the output audio signal after the switching. . As a result, the volume of the reproduced sound can be gradually reduced before a portion corresponding to the time when the output audio signal is switched by the switch, and gradually increased after the portion. As a result, it is possible to avoid that the reproduced sound is interrupted unnaturally, that the volume of the reproduced sound is changed discontinuously, and that noise is included at a portion corresponding to the time when the output audio signal is switched by the switch.

When the output audio signal is switched in accordance with the multiplexing system information, the recording audio signal generation unit includes a mute unit for performing a mute process on the output audio signal. An audio signal recording device may be a feature. As a result, the volume of the reproduced sound can be rapidly reduced at a portion corresponding to the time when the output audio signal is switched by the switch, and quickly restored after the portion. In this case, it is possible to prevent a rapid change in the volume from being heard from the reproduced sound. As a result, it is possible to avoid that the reproduced sound is interrupted unnaturally, that the volume of the reproduced sound is changed discontinuously, and that noise is included at a portion corresponding to the time when the output audio signal is switched by the switch.

An audio signal recording apparatus according to still another aspect of the present invention comprises: at least one multiplex audio signal input unit for externally inputting at least one multiplex audio signal; A multiplexing scheme determining unit for determining the multiplexing scheme of the multiplexed audio signal input to the unit, and outputting the determination result as multiplexing scheme information, or
(b) a multiplexing system information input unit for externally inputting multiplexing system information of the multiplexed audio signal; separating a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input unit. An audio signal extraction unit for extracting and outputting as a plurality of extracted audio signals; inputting an input audio signal including the extracted audio signal; outputting at least one of the input audio signals as an output audio signal; A switch for switching an output audio signal according to a predetermined input;
An encoding format is determined according to the multiplexing system information from the multiplexing system discriminating unit, a high-efficiency encoding is performed on the output audio signal from the switch in the encoding format, and the processed audio signal is recorded. An encoding processing unit for outputting as an audio signal; and a recording unit for recording the recording audio signal and the multiplexing system information as separate files on a recording medium.

Here, the audio signal multiplexing method includes, for example, monaural (1 channel), stereo (2 channels), dual monaural (2 channels) such as bilingual broadcasting, and the like.
Includes 5.1 channel surround (6 channels).

In the above-described audio signal recording device, a file of the multiplex system information of the audio signal can be recorded as a file separate from the audio signal. Therefore, when reproducing the audio signal recorded by the audio signal recording device, the audio signal reproducing device can select whether or not to refer to the multiplex method information. For example, it is assumed that the above audio signal recording device supports the DVD video standard. In this case, the data structure of the audio signal and the like recorded by the audio signal recording device described above includes, in addition to the portion specified by the DVD video standard, a DV signal.
It has a part not specified in the D-video standard, that is, a multiplex system information file. However, an audio signal reproducing device conforming to the DVD video standard, when reproducing the audio signal,
It is possible not to refer to the multiplex method information file.
Therefore, the audio signal reproducing device conforming to the DVD video standard can reproduce the audio signal recorded by the above-described audio signal recording device without extending the conventional configuration.

The above audio signal recording apparatus records an audio signal for recording in a different encoding format every time the multiplex system is changed. In this case, the above-described audio signal recording apparatus ends the title being recorded and starts recording another title every time the multiplexing method is changed. As a result, one file of the recording audio signal is generally recorded in a plurality of titles. Therefore, when the recording audio signal included in one file is reproduced, the reproduced audio is discontinuous to some extent every time the title is changed. On the other hand, within each title, an optimal encoding format can be selected according to the multiplexing method of the multiplexed audio signal that was the source of the recording. For example, when the number of channels is reduced due to the change of the multiplexing method, it is not necessary to add the audio signals of the same number of channels as the number of the reduced channels. Since the increase in the amount of extra information can be avoided in this way, the quality of the recording audio signal that has been highly efficiently encoded by the encoding processing unit can be improved.

In the above-described audio signal recording apparatus, the multiplex system information is determined from the multiplexed audio signal input by the multiplex system determination unit, or is externally input through the multiplex system information input unit. Here, the input of the multiplexing system information by the multiplexing system information input unit includes, for example, a case where the multiplexing system information of the multiplexed audio signal is received in a packet different from the multiplexed audio signal through network communication. In that case, the multiplexed audio signal does not need to include the multiplexing scheme information. In particular, when multiplexing system information is input by the multiplexing system information input unit,
For example, the multiplexing method information is input before the multiplexed audio signal is input, so that the encoding processing unit can easily change the encoding format.

The audio signal reproducing apparatus according to the present invention comprises: (a)
A recording audio signal file including a recording audio signal corresponding to a multiplex audio signal; and (b) a multiplex method information file including multiplex method information of the multiplex audio signal. A read unit for reading a file and the multiplex format information file; and a reproducing unit for reproducing an audio signal based on the recording audio signal and the multiplex format information. The audio signal reproducing device can reproduce the audio signal from the recording medium on which the recording audio signal and the multiplex system information are recorded by the audio signal recording device according to the present invention.

[0057] The reproducing section comprises: (a) a recording audio signal reproducing section for reproducing the recording audio signal from the recording audio signal file; and (b) the multiplexing scheme information from the multiplexing scheme information file. A multiplexing method information reproducing unit for reproducing, comprising: reproducing an audio signal from a specific portion of the recording audio signal according to the multiplexing method information,
The above audio signal reproducing device may be a feature. The audio signal reproducing apparatus can reproduce, for example, only a stereo broadcast portion from a TV broadcast music program or only a bilingual broadcast portion from a foreign film program.

The recording medium according to the present invention comprises: (a) a recording audio signal file including a recording audio signal corresponding to a multiplex audio signal; and (b) a multiplex method information file including multiplex method information of the multiplex audio signal. , Are recorded in separate recording areas. When the audio signal reproducing device reproduces the audio signal from the recording medium according to the present invention, it is possible to select whether to refer to the multiplex format information file. For example, an audio signal reproducing apparatus conforming to a standard that limits the multiplexing method to one type in one title, such as the DVD video standard, can reproduce an audio signal only from a recording audio signal file without reference to a multiplexing method information file. .

The recording medium according to the present invention may be characterized in that the recording audio signal file is recorded on a substantially continuous recording area. In the recording medium described above, the recording audio signal is recorded in a substantially continuous recording area. Therefore, an audio signal reproducing apparatus conforming to a standard capable of continuously reproducing only audio signals recorded in a substantially continuous recording area, such as a DVD-R, can reproduce an audio signal from the recording medium.

The recording medium according to the present invention may be detachable from any of a device for recording and a device for reading the audio signal file for recording and the multiplex format information file. This allows the user to freely and easily carry the recording medium. Further, a recording medium can be stored separately from the above-described device.

The recording medium according to the present invention is preferably a DVD-R. In that case, the format of the recording audio signal file conforms to the DVD video standard. On the other hand, the format of the multiplex method information file is UDF (Universal
Disk Format). Therefore, a DVD player conforming to the DVD video standard can reproduce an audio signal based only on a recording audio signal file recorded on the DVD-R. On the other hand, if the DVD recorder can read the multiplexing method information file together with the recording audio signal file from the DVD-R, the audio signal can be reproduced while appropriately changing the multiplexing method. Further, the personal computer can read the multiplex format information file together with the recording audio signal file from the DVD-R by using a DVD-ROM drive, DVD-R drive, DVD-RAM drive or DVD-RW drive. Further, since the recording medium is a DVD-R, data can be recorded only once. So, for example,
By using it as an audio signal recording medium for official recording or for public evidence, it is possible to prevent data from being tampered with intentionally or negligently.

[0062]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below with reference to the drawings by way of preferred embodiments.

Embodiment 1 [Configuration of Audio Signal Recording Apparatus 100 According to Embodiment 1] FIG.
FIG. 1 is a block diagram illustrating a configuration of an audio signal recording device 100 according to a first embodiment of the present invention. The audio signal recording device 100 according to the first embodiment is an audio signal recording unit of a DVD-R recorder.

The tuner Ch receives the radio wave of the TV broadcast through the antenna A or the cable Ca and converts it into an intermediate frequency signal. Here, the TV broadcast may be an analog broadcast or a digital broadcast. Furthermore, TV broadcasts are generally audio multiplex broadcasts, and include, for example, monaural, stereo, or bilingual broadcasts. The multiplex audio signal input unit 1
An intermediate frequency signal is input from the tuner Ch, and a multiplex audio signal is detected from the intermediate frequency signal. The detected multiplexed audio signal is output to the audio signal extraction unit 3.

The multiplexing type discriminating unit 2 is a multiplexed audio signal input unit 1
The multiplexing method (also referred to as multiplexing mode) is determined from the multiplexed audio signal detected by (1). More specifically, the multiplexing scheme discriminating unit 2 detects a control signal from the multiplexed audio signal, and discriminates the multiplexing scheme from the control signal. Here, the multiplexing method includes
Monaural, stereo, dual monaural such as bilingual broadcasting, multilingual with three or more channels, multichannel sound for stereophonic sound (front, surround, and other sound effects, etc.), special multichannel sound such as karaoke sound, etc. There is a method. Further, the multiplexing scheme discriminating unit 2 creates multiplexing scheme information as a signal indicating the determined multiplexing scheme.

The audio signal extracting section 3 demodulates the audio signals of a plurality of channels, which are generally multiplexed into the multiplexed audio signal, and extracts the audio signals of the respective channels as mutually independent extracted audio signals. Here, the types of the extracted audio signals include a monaural audio signal, a left channel (Lch) audio signal and a right channel (Rch) audio signal in a stereo broadcast, and a main audio signal and a sub audio signal in a dual monaural broadcast. There is.

Further, the audio signal extracting section 3 includes an analog / digital (AD) converter 3a. The AD converter 3a converts an extracted audio signal, which is an analog signal, into a digital signal by linear PCM. As a result, the audio signal extraction unit
The extracted audio signal output from 3 is a digital signal in all channels.

The format conversion unit 11 is a voice signal extraction unit 3
And extracts the extracted audio signal, and adjusts each format to a certain one. After that, an extracted audio signal of a certain format is input to the switch 4. As a result, the format of the output audio signal from the switch 4 becomes uniform. Therefore, the high-efficiency encoding unit 5 of the recording audio signal generation unit 5
For a, the same high-efficiency encoding process may be performed on the audio signal output from the switch 4. Therefore, the high efficiency coding unit 5a
Can easily perform efficient encoding of the output audio signal. In addition, since the setting of the high-efficiency encoding section 5a for the format of the output audio signal can be made constant, interruption for resetting can be avoided. As a result, the recording audio signal can be generated substantially continuously, so that the recording unit can record the recording audio signal file substantially continuously.

The audio signal synthesizing section 10 synthesizes a new audio signal from some of the extracted audio signals extracted by the audio signal extracting section 3. The synthesized voice signal (synthesized voice signal) is input to the switch 4 together with the extracted voice signal. The synthesized audio signal includes, for example, a surround effect audio signal, a reverberation audio signal, a subwoofer audio signal, a center effect audio signal, and the like.

The surround effect audio signal and the reverberant audio signal are obtained by adding or subtracting the Lch audio signal and the Rch audio signal of the stereo sound, delaying the original stereo sound by a predetermined delay amount, and setting a predetermined gain. Can be combined. In addition, the synthesis may be performed using the phase difference and the volume difference between the Lch audio signal and the Rch audio signal. When a stereo sound signal to which the above-mentioned surround effect sound signal or reverberation sound signal is added is reproduced, when the delay amount and the gain are both large, the reverberation of the reproduced sound resonates for a long time. Conversely, when the delay amount is small, the reverberation of the reproduced sound can be reduced. As a result, a large open feeling such as an outdoor concert can be given to the reproduced sound.

The subwoofer audio signal is obtained by passing a stereo audio signal or the like through a low-pass filter, separating and amplifying a low-frequency component thereof, and converting the signal into a channel different from the original stereo audio signal. The subwoofer audio signal can be reproduced by a speaker having good reproduction characteristics with respect to a low frequency, separately from the original stereo audio signal.

The center effect audio signal is obtained by passing a stereo audio signal or the like through a band-pass filter, separating and amplifying a frequency component from about 100 hertz to about several thousand hertz, and using a different channel from the original stereo audio signal. This is an audio signal. For example, the center effect audio signal is obtained by separating a frequency component corresponding to the dialog of an actor from an audio signal of a movie, a TV drama, or the like, and converting the frequency component into an audio signal different from the background sound. In that case, the actor's dialogue can be reproduced on a different speaker from the background sound.

Each of the above synthesized audio signals is a virtual multi-channel audio signal, and is actually synthesized from a stereo audio signal having only two channels. As described above, the synthesized audio signal generation unit 10 virtually synthesizes an audio signal having a larger number of channels from an audio signal having a predetermined number of channels. Before starting the recording of the title, the user sets in advance the type of the synthesized audio signal synthesized by the audio signal synthesizing unit 10 using a mechanical switch B1 such as a button.

The switch 4 inputs an extracted audio signal from the audio signal extracting unit 3 and a synthesized audio signal from the audio signal synthesizing unit 10 as input audio signals. Further, the switch 4 inputs the multiplex method information from the multiplex method discriminating section 2.
The switch 4 selects audio signals of several channels from the input audio signals based on the multiplexing scheme information, and outputs the selected audio signals to the recording audio signal generation unit 5 as output audio signals. The switch 4 switches the output audio signal particularly when detecting a change in the multiplexing method from the multiplexing method information.

Before starting the recording of the title, the user inputs a predetermined signal to the switch 4 by a mechanical switch B2 such as a button, for example, thereby presetting the multiplexing method of the output audio signal. However, the type of the multiplexing method set as such is limited to one type in one title.
Due to this limitation, the audio signal recording apparatus 100 of the first embodiment
An audio signal can be recorded on the VD-R7 so that it can be reproduced by a DVD player conforming to the DVD video standard, as described later. When the multiplexed audio signal has a specific multiplexing method, the switch 4 selects an output audio signal based on the multiplexing method set by the user. For example, when the user sets the selection of the main audio signal, when the multiplexing method of the multiplexed audio signal is dual monaural, the switch 4 selects the main audio signal as the output audio signal.

The recording audio signal generator 5 generates a recording audio signal based on the output audio signal from the switch 4.
In particular, the recording audio signal generation unit 5 includes a high efficiency encoding unit 5a. The high-efficiency encoding unit 5a performs high-efficiency encoding on the audio signal output from the switch 4, and encodes the audio signal in a predetermined encoding format. The encoding format includes, for example, linear PCM (pulse code modulation), MPEG / audio, Dolby Digital (hereinafter, referred to as AC-3), and the like. Before starting the recording of the title, the user selects an encoding format in advance by using a mechanical switch B3 such as a button.

The linear PCM can maintain the highest sound quality of reproduced sound as compared with other encoding formats. In the case of linear PCM, the encoding format in the AD converter 3a of the audio signal extraction unit 3 may be used as it is. On the other hand, MPEG / Audio and AC-3 are linear PCM
Since the audio signal can be more efficiently compressed as compared with the above, the amount of information per channel of the audio signal for recording can be reduced. Therefore, the number of recordable channels can be increased as compared with the linear PCM, or the area for recording the audio signal on the DVD-R7 can be reduced.

Further, the recording audio signal generation unit 5 includes a multiplexing unit 5
including b. Since the output audio signal from the switch 4 has a plurality of channels, the multiplexing unit 5b multiplexes the output audio signals of the plurality of channels and generates a recording audio signal as one serial signal.

The recording section 6 includes a semiconductor laser 6a for irradiating the surface of the DVD-R 7 with a laser, and blinks the semiconductor laser 6a in accordance with a digital signal to be recorded.
When a part of the recording film on the surface of the DVD-R7 is irradiated with a strong laser by the semiconductor laser, the irradiated part is altered by the heat of the laser. As a result, the light reflectance changes in the portion of the recording film irradiated with the laser. Thus, the recording unit 6
Converts the digital signal into the optical reflectance of the recording film of the DVD-R7 and records it.

The recording section 6 converts the recording audio signal from the recording audio signal generation section 5 into one recording audio signal file 8 for at least one title. The recording unit 6 handles the recording audio signal file 8 as an audio stream of the DVD video standard. On the other hand, the recording unit 6 receives a video signal file from a video signal processing unit (not shown) in the DVD-R recorder and a sub-video signal file from a sub-video signal processing unit (not shown) in the DVD-R recorder. Enter each. The recording unit 6 handles the video signal file and the sub-video signal file as a video stream and a sub-picture stream of the DVD video standard, respectively. The recording unit 6 divides each of the three streams into a plurality of packets.
Each packet has a structure specified by the DVD video standard, and particularly includes a predetermined header. The recording unit 6 multiplexes those packets as one stream,
-Record sequentially to R7.

On the other hand, the recording unit 6 inputs the multiplexing system information from the multiplexing system determining unit 2 to the temporary storage unit 6b. Temporary storage unit 6b
Combines the multiplexing method information of the title with its elapsed time information in a UDF file, ie, a multiplexing method information file 9
And record temporarily. Here, the elapsed time information of the multiplex method information is information indicating a temporal position in the title of the recording audio signal corresponding to the multiplex method information. The temporal position of the recording audio signal in the title is represented by, for example, the elapsed time from the recording start time of the title to the recording time of the recording audio signal.

FIG. 2A is a perspective view showing the entire appearance of the DVD-R 7 and the state of laser irradiation from the pickup P of the DVD player. FIG. 2B is an enlarged view of a region A surrounded by a broken line in FIG.
FIG. 2 (b) also shows a cross section B perpendicular to the surface of the DVD-R7 and along the radial direction. DVD-R7
Is the standard for DVD-R (DVD-R for General Ver.2.0)
It is a disc with a diameter of about 120mm and a thickness of about 1.2mm in conformity with. The disk substrate 70 has a thickness of about 0.6 mm and is a polycarbonate disk.

A groove 71 is provided on the surface of the disk substrate 70. The groove 71 is a spiral groove coaxial with the disk substrate 70. The groove 71 has a finely wavy shape in the horizontal direction, that is, a wobble 71a. The land 72 is a surface portion of the disk substrate 70 between the grooves 71. The prepit 77 is a groove in the land 72, and there are one to three for every 16 periods of the wobble 71a. The pre-pit 77 is located near the maximum displacement position of the wobble 71a going outward in the radial direction of the disk substrate 70 (hereinafter, referred to as the vertex of the wobble 71a).

The recording film 73 is on the surface of the groove 71. The recording film 73 contains an organic dye. The organic dye is preferably purple. A part of the recording film 73 is irradiated with a strong laser having a power of about 30 mW, preferably a red laser, from the semiconductor laser 6a of the recording part 6. Recording film irradiated with laser at that time
The portion 73 is altered by the heat of the laser, and in particular, changes the light absorption characteristics. As a result, the light reflectance of the portion of the recording film 73 that has been subjected to the laser irradiation changes as compared with the other portions. The portion of the recording film 73 where the light reflectance has changed is called a pit. The portion of the disk substrate 70 that is in contact with the pits is irreversibly deformed by a rise in temperature during recording. Therefore, in DVD-R7, DV
Unlike the D-RW and the DVD-RAM, the change in the light reflectance of the recording film 73 is limited to only once. As a result, DVD
In -R7, data can be written only once by forming pits.

The reflection film 74 is a thin film covering the entire groove 71 and the land 72, and is made of a metal having high light reflectance, preferably gold. The overcoat layer and the adhesive layer 75 cover the reflective film 74, level the unevenness of the groove 71 and the land 72,
The disk substrate 70 and the support plate 76 are closely bonded. The support plate 76 has a thickness of about 0.6 mm and is a polycarbonate disk.

FIG. 3 shows a DVD-R7 by a DVD player.
FIG. 5 is a diagram for explaining a radial push-pull signal S0, a wobble signal Sw, and a pre-pit signal Sp read from the ASIC. (A), (b), (c), (d), and (e) of FIG. 3 are a radial push-pull signal S0, a first filtered signal S1,
The wobble signal Sw, the second filtered signal S2, and the pre-pit signal Sp.

Pickup P of DVD player ((a) of FIG. 2)
) Is applied to the groove 71 of the DVD-R7. At that time, the spot on the groove 71 of the laser has a diameter slightly larger than the width of the groove 71. The irradiated laser is reflected by the recording film 73 on the groove 71 at the reflectance of each irradiated portion. The pickup P detects the intensity of the reflected light with a photodetector. The photodetector is optically split into two parts. Each divided part is a groove 71
The intensity of light reflected from the outside and inside in the radial direction of the disk substrate 70 with respect to the center line 71c (see FIG. 2B) is detected. The intensity of the reflected light detected by each of the divided portions of the photodetector is converted into an electric signal having an amplitude proportional to the intensity of the reflected light. The difference between the two converted electric signals is calculated by the push-pull method. As a result, the radial push-pull signal S0 is obtained, for example, with a waveform as shown in FIG.

The radial push-pull signal S0 is filtered by a band-pass filter. As a result, a frequency band component of about 140 kHz around the radial push-pull signal S0, that is, a first filtered signal S1 is obtained with a waveform as shown in FIG. Further, the first filtered signal S1 is binarized, and the wobble signal Sw is obtained as a rectangular wave as shown in FIG. Wobble signal
The frequency of the Sw is almost constant, for example, about 140 kHz when the rotation speed of the DVD-R7 is the standard speed of 3.84 m / s. The wobble signal Sw has a predetermined phase relationship with the data signal read from the pit, and is used, for example, as a clock signal at the time of recording.

Apart from the above, a radial push-pull signal
Filter S0 with a high-pass filter. As a result, a predetermined high frequency component of the radial push-pull signal S0, that is, a second filtered signal S2 is obtained with a waveform as shown in (d) of FIG. Further, only the amplitude component equal to or larger than a predetermined threshold value is extracted from the second filtered signal S2 by the comparator, and the extracted component is binarized. As a result, the pre-pit signal Sp
The waveform is obtained as shown in FIG. The pre-pit signal Sp has one to three peaks every 16 cycles of the wobble signal Sw. Like the wobble signal Sw, the pre-pit signal Sp has a predetermined phase relationship with respect to the data signal read from the pit, and is used as a recording clock signal, for example, like the wobble signal Sw. Further, the pre-pit signal Sp is less likely to cause crosstalk between tracks recorded on the groove 71 than the wobble signal Sw. Thereby,
The pre-pit signal Sp is less likely to lose phase information than the wobble signal Sw. Therefore, the pre-pit signal Sp is used as an index of the physical address of the track.

<Physical Format on DVD-R7> The shortest length T of a pit is about 0.40 μm. The recording of digital signals by pits is based on mark edge recording. That is, the edge of the pit in the length direction is
Represents the transition from to 1 or from 1 to 0. As a result, 1-bit data is recorded per recording area having a length of 1T on the groove 71.

The recording area on the groove 71 is identified as one sync frame for each continuous area having a length of 1488T. Since one cycle of the wobble 71a is equal to 186T, eight cycles of the wobble 71a are included in one sync frame. The start of the sync frame is determined so as to coincide with the vertex of the wobble 71a. Further, the data recording area of the continuous 26 sync frames on the groove 71 is called one sector, and the data recording area of the continuous 16 sectors is called one ECC block. Here, ECC is an error correction code (Error C
orrection Code).

There are three types of pre-pits 77: synchronous pit B0, even / odd pit B1, and address pit B2. Synchronous pit
B0 provides a synchronization signal for synchronizing with a sync frame when writing and reading pits. Synchronous pit B0
Is installed in an even-numbered sync frame in one sector, for example. In addition, it may be installed in an odd-numbered sync frame. In any case, synchronous pit B0 is 2
One for each sync frame. Further, the synchronization pit B0 is set near the vertex of the first cycle of the wobble included in the even-numbered sync frame.

The even-odd pit B1 indicates that the synchronous pit B0 is set in the even-numbered sync frame in one sector. That is, when the synchronous pit B0 is set in the odd-numbered sync frame, the even-odd pit B1 is not set. Furthermore,
The even-odd pit B1 is the second sync frame in one sector and is set near the vertex of the second cycle of the wobble included in the sync frame.

The address pit B2 is set near the vertex of the third cycle of the wobble included in the same sync frame as the synchronization pit B0. The address pit B2 indicates the head position of the area where the address information of the sync frame is recorded.

FIG. 4 is a diagram showing a physical format on the recording area of the DVD-R7. The recording area of the DVD-R7 includes a disc specific information recording area (BCA) 7a and a recording power calibration area (PCA: Power
Calibration Area) 7b, file system information recording area
7c, a lead-in area 7d, a data area 7e, and a lead-out area 7f. Physical addresses indicating the positions of these areas are specified by the pre-pit signal Sp.

The BCA 7a is an area where information unique to the DVD-R7, such as a serial number, is recorded. PCA 7b is a recording unit 6
Is an area in which data for calibrating the power of the laser at the time of writing is recorded. At the start of recording, the recording unit 6 first adjusts the power of the laser at the time of writing by the PCA. After adjusting the laser power in the PCA, the recording unit 6 starts recording data. File system information recording area
Reference numeral 7c denotes an area in which information of the file system itself of the DVD-R7 is recorded, and an area for recording address information of a file recorded in the DVD-R7.

The lead-in area 7d is an area for recording predetermined data indicating the head of the data area 7e. The data area 7e is an area where the recording unit 6 can write data. The lead-out area 7f is an area for recording predetermined data indicating the end of the data area 7e. The data in the lead-in area 7d and the lead-out area 7f are stored in the recording unit.
When the writing of the data area 7e by 6 is completed, the data is written by the recording unit 6.

The DVD-R7 is a DVD-R according to the first embodiment.
It is removable from both the recorder and the DVD player. Therefore, it is convenient to carry. Furthermore, DVD-
In R7, data can be written only once by the recording unit 6, and cannot be rewritten. Therefore, since data falsification can be prevented, it is optimal for recording official data.

[Operation of the Audio Signal Recording Apparatus 100 According to the First Embodiment] The operation of the audio signal recording apparatus 100 according to the first embodiment configured as described above will be described below. Tuner C
h receives TV broadcast radio waves through antenna A or cable Ca, converts it to an intermediate frequency signal, and multiplexes audio signal input unit 1
Output to The multiplexed audio signal input unit 1 detects a multiplexed audio signal from the input intermediate frequency signal, and outputs the detected multiplexed audio signal to the multiplexing scheme discriminating unit 2 and the audio signal extracting unit 3.

The multiplexing scheme discriminating section 2 discriminates the multiplexing scheme of the input multiplexed audio signal and creates multiplexing scheme information of the multiplexed audio signal. After that, the multiplexing information is output to the switch 4 and the recording unit 6. On the other hand, the audio signal extracting unit 3 creates an extracted audio signal by demodulating the audio signals of a plurality of channels multiplexed from the input multiplexed audio signal. Of the extracted audio signals, those of analog signals are converted into digital signals by the AD converter 3a. The extracted audio signal is output to the switch 4 as a digital signal.

The audio signal synthesizing section 10 inputs a part or all of the extracted audio signal and synthesizes a synthesized audio signal of a type preset by the user. As an example of the setting, a case where a copy of a stereo Lch audio signal, a copy of an Rch audio signal, and a surround effect audio signal are set will be described below. The synthesized voice signal is output to switch 4.

<Selection of output audio signal by switch 4>
The user sets the multiplexing method of the output audio signal to the switch 4 in advance, for example, to stereo. Further, it is set in advance that the switch 4 selects the main audio signal when the multiplexing method of the multiplexed audio signal is switched from stereo to dual monaural. Based on such settings, the switch 4 selects an output audio signal from the input audio signals, for example, as follows.

When recording of one title is started, if the multiplexing method of the multiplexed audio signal is determined to be stereo from the multiplexing information, the switch 4 selects an Lch audio signal and an Rch audio signal from the input audio signal. Thereafter, when it is determined from the multiplexing method information that the multiplexing method has been switched from stereo to dual monaural in the same title, the switch 4 selects the Lch audio signal and the copy of the Lch audio signal among the input audio signals. That is, the stereo Rch audio signal is L
A copy of the ch audio signal is output from the switch 4. In this way, the output audio signal can be substantially switched from the stereo audio signal to the dual monaural main audio signal while the multiplexing method of one title is set to stereo.

The same applies to the case where the user sets the selection of the sub audio signal to the switch 4. That is, when it is determined from the multiplexing method information that the multiplexing method has been switched from stereo to dual monaural in the same title, the switch 4 selects the Rch audio signal and the copy of the Rch audio signal among the input audio signals. In this way, the output audio signal can be substantially switched from the stereo audio signal to the dual monaural sub audio signal while the multiplexing method of one title is set to stereo. Further, when the multiplexing method of the multiplexed audio signal is switched from stereo to monaural, the output audio signal can be substantially switched from stereo to monaural while the multiplexing method of one title is set to stereo.

Instead of the above stereo setting, the user presets the multiplexing method of the output audio signal to surround in the switch 4. Based on such settings, the switch 4 selects an output audio signal from the input audio signals, for example, as follows.

When recording of one title is started, if the multiplexing method of the multiplexed audio signal is determined to be surround from the multiplexing information, the switch 4 selects a 6-channel surround audio signal from the input audio signal. Thereafter, when it is determined from the multiplexing method information that the multiplexing method has been switched from surround to stereo within the same title, the switch 4 selects a stereo audio signal and a surround effect audio signal from the input audio signal. That is, the surround effect audio signal is output from the switch 4 as the audio signals of the remaining four channels excluding the stereo audio signals of the two channels. Thus, even if the multiplexing method of the multiplexed audio signal is switched from surround to stereo during the recording of one title, and the number of channels of the extracted audio signal is reduced, the recording of the title can be continued.

The recording audio signal generating section 5 executes high efficiency encoding on the audio signal output from the switch 4 by the high efficiency encoding section 5a. The encoding format at that time is set in advance by the user.

The recording section 6 converts the recording audio signal from the recording audio signal generation section 5 into one recording audio signal file 8 for at least one title. The recording unit 6 divides the recording audio signal file 8 into a plurality of audio packets as an audio stream of the DVD video standard. Each audio packet includes a predetermined header. Similarly, the recording unit 6 divides the video signal file and the sub-video signal file into video packets and sub-picture packets, respectively. The recording unit 6 multiplexes the above three types of packets into one multiplexed stream. Furthermore,
The multiplexed stream is sequentially recorded in a substantially continuous recording area on the DVD-R7 as described later. As a result, the recording area of the recording audio signal file 8 sandwiches the respective recording areas of the video packet, the sub-picture packet, the header of the audio packet, the synchronization signal, the address information on the recording medium, and the error correction code. And is substantially continuous.

Further, during the underbuffer run, the recording section 6 creates padding information (dummy data) having the same information amount as the insufficient recording audio signal. The padding information is inserted into the missing part in the audio packet. Thereby, the recording unit 6 avoids interruption of the recording operation during the underbuffer run, and prevents interruption of the data of the recording audio signal file 8.

Thus, the recording section 6 records the recording audio signal file 8 in a substantially continuous recording area on the DVD-R 7. As a result, the recording unit 6 can reduce the execution of linking particularly when recording the recording audio signal file 8. Thus, in the first embodiment, it is possible to prevent a decrease in recording capacity and an increase in processing time due to linking.

On the other hand, the recording unit 6 temporarily stores the multiplexing system information from the multiplexing system determining unit 2 in the temporary storage unit 6b. Temporary storage
6b forms the multiplexing information file 9 by combining the multiplexing information with the elapsed time information. After the recording of the recording audio signal file 8 is completed, the recording unit 6 reads out the multiplex format information file 9 from the temporary storage unit 6b and records it on the DVD-R7.

[Data Format on DVD-R7]
FIG. 5 is a diagram showing a data format in the data area 7e of the recording area on the DVD-R7. In FIG. 5, as an example, it is assumed that three titles A, B, and C are recorded.

The disc management information recording area 21 is a data area
It is located at the innermost periphery of 7e and records disk management information described later. The title-related information recording area 22 is located outside the disc management information recording area 21 and records title-related information described later. The disc management information recording area 21 and the title related information recording area 22 are each set to a predetermined size in advance. The remaining data area 7e is a title recording area 23, in which a video signal, a sub-video signal, and an audio signal are recorded for each title.

<Recording of Title Data> The recording unit 6 multiplexes the recording audio signal file of the first title A together with the video signal file of the title A and the sub-video signal file as described above. Form a stream. Further, the recording unit 6 sequentially records the multiplexed stream of the title A in one recording area substantially continuous from the head of the title recording area 23, that is, in the title A recording area 23a. As a result, the recording area of the recording audio signal file of the title A is substantially continuous in the title A recording area 23a. That is, a video packet, a sub-picture packet, a header of an audio packet, a synchronization signal, address information on a recording medium and an error correction code,
Are substantially continuous with the respective recording areas interposed therebetween.

The video signals, sub-video signals and audio signals of the titles B and C are recorded outside the title A recording area 23a in the same manner as the title A. As a result, in the title recording area 23, a title A recording area 23a, a title B recording area 23b, and a title C recording area 23c are formed in that order. However, the title recording area 23 such as between the title A recording area 23a and the title B recording area 23b.
Information about linking is recorded between recording areas of two titles that are continuous in the title. Further, an area outside the title C recording area 23c is set as a lead-out area 7f by a finalizing process described later.

<Recording of Title-Related Information> After the recording of the title A in the title A recording area 23a is completed, the recording unit 6 reads the multiplex format information file 9 from the temporary storage unit 6b. Further, the recording unit 6 creates title A-related information by combining the information about the title A, such as the multiplex method information file 9, the label of the title, and the recording date and time. Here, the label of the title is input by the user, for example, and the recording date and time is output by the clock inside the DVD-R recorder, for example.
Each is set. The title A related information is recorded in one recording area substantially continuous from the head of the title related information recording area 22, that is, in the title A related information recording area 22a.

The title-related information of the titles B and C is recorded outside the title-A-related information recording area 22a and is recorded similarly to the title A. As a result, in the title related information recording area 22, a title A related information recording area 22a, a title B related information recording area 22b, and a title C related information recording area 22c are formed in that order. Further, predetermined padding information is recorded in a remaining area in the title-related information recording area 22 by a finalizing process described later.

FIG. 6 is a diagram in which the video signal V, sub-picture signal P, and audio signal S recorded in the title A recording area 23a are arranged in parallel and in the order of the broadcast time of the title A. In FIG. 6, as an example, it is assumed that the user previously selects the main audio for dual monaural, and sets the selection of switch 4 for title A to stereo. Therefore, the audio signal S has two channels, Lch and Rch.

It is further assumed that the multiplexing method of the multiplexed audio signal of title A is switched between stereo and dual monaural as follows. First, the start time of title A
It is stereo from A0 to the first switching time A1.
The first switching time A1 to the second switching time A2 is dual monaural, and the second switching time A2
Is stereo until the third switching time A3. The third switching time A3 to the fourth switching time A4 is dual monaural, and the fourth switching time A4 to the end time A5 of the title A is stereo.

The audio signal S in the title A recording area 23a is
Recorded as follows by the selection of switch 4. From the start time A0 of the title A to the first switching time A1, a stereo Lch audio signal is used for the Lch of the audio signal S,
On the other hand, in Rch, an Rch audio signal is recorded. First switching time A1 to second switching time
Until A2, the Lch of the audio signal S is an Lch audio signal, that is, a dual monaural main audio signal, while the Rch is an Lch audio signal.
Each copy of the ch audio signal is recorded. From the second switching time A2 to the third switching time A3, and from the fourth switching time A4 to the end time of the title A
Until A5, the Lch audio signal and the Rch audio signal are recorded in the Lch and the Rch of the audio signal S, respectively. From the third switching time A3 to the fourth switching time A4, a copy of the Lch audio signal and a copy of the Lch audio signal are recorded in the Lch and Rch of the audio signal S, respectively.

FIG. 7 shows the data format of title-related information 30 for title A. Title related information
Reference numeral 30 denotes a title label 31, title information 32, multiplex method information file data 33, and title end information. The title information 32 includes the recording date of the title, the TV broadcast channel, and the multiplexing method set for the switch 4. In the example of FIG. 6, the title information 32 includes that the multiplexing method of the audio signal S is set to stereo.

The multiplex method information file data 33 is data of the multiplex method information file 9 and includes multiplex method information of the original audio signal before recording and elapsed time information thereof.
The first multiplexing method information file data 33a includes (a) the start time A0 of the title A, (b) the multiplexing method of the original audio signal at the time A0 is stereo, and (c) the first switching time. The time T1 until A1 is shown. The second multiplex method information file data 33b includes (a) first switching time A1,
(b) The multiplexing method of the original audio signal is switched to the dual monaural at the time A1, and (c) the time T2 until the second switching time A2. The third multiplexing method information file data 33c includes (a) the second switching time A2, (b)
At time A2, the multiplexing method of the original audio signal is switched to stereo, and (c) the time T until the third switching time A3.
Shows 3. The fourth multiplex method information file data 33d is
(a) Third switching time A3, (b) At time A3, the multiplexing method of the original audio signal has been switched to dual monaural,
And (c) a time T4 up to a fourth switching time A4. The fifth multiplexing method information file data 33e includes (a) the fourth switching time A4, (b) that the multiplexing method of the original audio signal has been switched to stereo at time A4, and (c) the end time of title A. Time T5 until A5 is shown.

Finally, the title end information 34 indicates the end time of the title. For title A, title end information 34 is end time A5.

<Recording of Disc Management Information> After the recording of the title C is completed, when no further recording is to be performed on the DVD-R7, the recording unit 6 performs a finalizing process on the DVD-R7. At this time, the recording unit 6 particularly creates the disc management information with reference to the information in the title-related information recording area 22 and the title recording area 23, and generates the disc management information recording area 21.
Record to.

The disc management information is created according to the DVD video standard. The disc management information includes (a) the total number of titles recorded in the data area 7e, (b) the label of the title, (c) the title information (recording date, TV broadcast channel, multiplex set for the switch 4). And the like, and (d) the respective addresses of the title A recording area 23a, title B recording area 23b, and title C recording area 23c. However, the disc management information does not include any address information in the title-related information recording area 22.

[Playback on DVD Player Compliant with DVD Video Standard] A DVD-R7 in which three titles A to C are recorded as described above by the DVD-R recorder according to the first embodiment.
Is reproduced by a DVD player conforming to the DVD video standard.

In the DVD video standard, the audio attribute of the audio stream, that is, the multiplexing method, is defined as one type for each title. The DVD player first reads the disc management information from the disc management information recording area 21. Since the disc management information complies with the DVD video standard as described above, the DVD player can reproduce the data of titles A to C from the DVD-R7 based on the disc management information.

The DVD player particularly determines the multiplexing method of the reproduced audio signal for each title to be the one indicated by the disc management information. For example, the title A is determined to be stereo. After the determination, while the title A is being reproduced, the multiplexing method of the reproduced audio signal is fixed to stereo. Therefore,
During playback of the title A, the DVD player processes the reproduced audio signal as a stereo Lch audio signal and an Rch audio signal. However, the Rch of the audio signal S of the title A recorded on the DVD-R7 includes, as shown in FIG.
Are alternately recorded. Therefore, the above D
The voice actually reproduced by the VD player is the same as that in the first embodiment.
Sounds as set in the multiplexing method for the switch 4 of the DVD-R recorder. That is, when the multiplexing method of the original audio signal is stereo, the reproduced audio can be heard in stereo. On the other hand, when the multiplexing method of the original audio signal is dual monaural, the reproduced audio is heard as the main audio. In this way, the DVD player fixes one multiplexing method in one title according to the DVD video standard, and then switches the reproduction sound to the switch 4.
Can be switched substantially as set for.

As described above, the disc management information does not include any address information in the title related information recording area 22.
Accordingly, the DVD player does not access the title-related information recording area 22. That is, the DVD player reproduces title data without referring to title-related information. Thus, it is possible to prevent the DVD player from performing an abnormal operation such as runaway due to access to the title-related information recording area 22. Thus, the DVD-R recorded by the DVD-R recorder according to the first embodiment
7 can be reproduced by a DVD player conforming to the DVD video standard.

In the first embodiment, the DVD-R is used as the recording medium. In addition, DVD-RW, DVD-RAM, or
An audio signal recording device 10 according to the first embodiment is used for a magneto-optical disk or the like.
The recording medium may be set to 0. In particular, DVD-RW has D
Like the VD-R, it can be reproduced by an audio signal reproducing device such as a DVD player conforming to the DVD video standard.

[Position of AD Converter] In the first embodiment, the audio signal extraction unit 3 includes the AD converter 3a. Thus, the audio signal synthesizing unit 10 can synthesize a high-quality synthesized audio signal by digital signal processing. Further, the high efficiency encoding section 5a of the recording audio signal generation section 5 can perform high efficiency encoding of the audio signal output from the switch 4 at high speed.

In addition to the audio signal extracting section 3, for example, the switch 4 may have an AD converter. In that case, preferably, the switch 4 processes only the selected output audio signal by the AD converter. As a result, the number of channels to be A / D converted can be reduced as compared with the case where the extracted audio signals of all the channels are A / D-converted in the audio signal extraction unit 3.
The number of converters can be reduced.

In addition to the switch 4, a recording audio signal generation unit 5
May have an AD converter. In this case, the recording audio signal generation unit 5 determines, for example, whether each of the audio signals output from the switch 4 is a digital signal or an analog signal.
Of the output audio signals, those which are digital signals are input to an AD converter and AD-converted. On the other hand, an output audio signal that is an analog signal is not passed through the AD converter. After such processing, the recording audio signal generation unit 5 starts generating a recording audio signal. When the A / D conversion of the output audio signal is performed by the recording audio signal generation unit 5, the number of channels to be A / D converted can be reduced as compared with the case where the A / D conversion of the extracted audio signal is performed in the audio signal extraction unit 3, similarly to the switch 4. Therefore, the number of AD converters can be reduced.

[Input of a Plurality of Multiple Audio Signals] The audio signal recording apparatus 100 according to the first embodiment
In addition, a plurality of different multiplexed audio signal input units may be provided. For example, the multiplexed audio signal input unit 1 is a tuner Ch.
Multiplex audio signal of TV broadcast. With it
Another plurality of multiplexed audio signal input units may input a plurality of multiplexed audio signals from an external audio input, a digital video camera, and a personal computer, respectively. Further, a multiplexed audio signal input unit different from the multiplexed audio signal input unit 1 may input a multiplexed audio signal of TV broadcast of another channel from the common tuner Ch.

When there are a plurality of multiplexed audio signal input sections as described above, preferably, there are a plurality of multiplexing scheme discriminating sections corresponding to the respective multiplexed audio signal input sections. In this case, the switch 4 selects an output audio signal from the extracted audio signals in accordance with a plurality of pieces of multiplexing scheme information from a plurality of multiplexing scheme determining units. Thus, a plurality of multiplexed audio signals can be transmitted to the first embodiment.
As in the case of DVD-
Can be recorded in R7.

<< Embodiment 2 >> FIG. 8 is a block diagram showing an audio signal reproducing apparatus 200 according to Embodiment 2 of the present invention. The audio signal reproducing device 200 according to the second embodiment is an audio signal reproducing unit of a DVD player. Example 1 for DVD-R7
It is similar to that of Therefore, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof is the same as that of the first embodiment.

The reading section 201 is a pickup of the DVD player described above, and includes a semiconductor laser 201a for irradiating a laser to the surface of the DVD-R7 and a light detection for detecting light reflected from the surface of the DVD-R7. Unit 201b. The semiconductor laser 201a irradiates a laser to the surface of the DVD-R7. The intensity of the laser at that time was determined by the recording unit of the first embodiment.
Since it is weaker than 6a 6a, the light reflectance does not change at the portion of the recording film irradiated with the laser. Semiconductor laser 201a
Is reflected by the surface of the DVD-R7. The photodetector 201b detects the intensity of the reflected light. As described in the description of the first embodiment, the DVD-R7 transmits the digital signal to the recording film 73.
Is recorded as a change in light reflectance. Therefore, if the intensity change of the reflected light is detected by the photodetector 201b, the DVD-
The digital signal recorded in R7 can be read.

The recording audio signal reproducing unit 202 includes a read unit 2
In step 01, a recording audio signal is detected from the signal read from the DVD-R7. The multiplexing system information reproducing unit 203 detects multiplexing system information from the signal read from the DVD-R7 by the reading unit 201. The control unit 204 includes a read unit 201
The read unit based on the synchronization signal, wobble signal Sw and pre-pit signal Sp read from the DVD-R7
Control 201. For example, the above-described servo control of the pickup and setting of a read destination address are performed.

The audio signal processing unit 205 receives the recording audio signal from the recording audio signal reproducing unit 202 and converts it into audio signals of a plurality of channels. The audio signal processing unit 205 particularly includes a decoder 205a for decoding the audio signal for recording. Thus, for example, the recording audio signal compressed by the high-efficiency encoder similar to the high-efficiency encoder 5a of the recording audio signal generator 5 of the first embodiment is decoded. The audio signals of a plurality of channels output from the audio signal processing unit 205 are respectively input to the speakers 207 and converted into audio.

The audio signal processing control unit 206 determines the multiplexing system from the multiplexing system information and the like output by the multiplexing system information reproducing unit 203, and based on the multiplexing system, for example, the audio to be output by the audio signal processing unit 205 A signal is selected, or a speaker 207 as an output destination is specified.

The DVD-R 7 is a DVD-R according to the first embodiment.
When the audio signal recorded by the recorder is included, the audio signal reproducing apparatus 200 according to the second embodiment can reproduce the audio signal from the DVD-R7 by referring to the multiplexing system information as follows.

The reading section 201 reads the disc management information from the disc management information recording area 21 (see FIG. 5) and also reads the title related information from the title related information recording area 22 (see FIG. 5). The audio signal processing control unit 206 can select the multiplexing method of the audio signal to be output by the audio signal processing unit 205 based on the multiplexing method information of the title-related information. For example, when the multiplexing method is alternately switched between stereo and dual monaural in one title as shown in FIG. 6, the audio signal processing control unit 206 can select only the dual monaural part. Thus, for example, FIG.
Example 2 when the title A of the TV program is a TV broadcast foreign movie program
The audio signal reproducing apparatus 200 according to the present invention can reproduce only the foreign film part of the bilingual broadcast by skipping the CM part of the stereo broadcast. As described above, the audio signal reproducing device 200 according to the second embodiment can reproduce the audio signal of the format according to the DVD video standard recorded by the audio signal recording device according to the first embodiment.

The audio signal reproducing device according to the second embodiment can be realized by a personal computer as follows. For example, DVD-RO
The M drive functions as a reading unit 201, and the CPU executes a predetermined program to execute the recording audio signal reproducing unit 20.
2 and function as the multiplex method information reproducing unit 203.

<< Embodiment 3 >> FIG. 9 is a block diagram showing a configuration of an audio signal recording apparatus 300 according to Embodiment 3 of the present invention. The audio signal recording device 300 according to the third embodiment is similar to the audio signal recording device 300 according to the first embodiment.
Similarly, this is an audio signal recording unit of the DVD-R recorder, which is obtained by adding a temporary recording medium 301 to the same configuration as that of the first embodiment. Therefore, in the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description of the first embodiment will be referred to.

The temporary recording medium 301 is either a hard disk or a semiconductor memory. The recording unit 6 stores the recording audio signal file 8 and the multiplex format information file 9 in a DVD-R.
Before recording on 7, the information can be temporarily recorded on the temporary recording medium 301.

When the temporary recording medium 301 is a large-capacity hard disk, the recording unit 6 can record the entire recording audio signal file 8 and the multiplex format information file 9 on the temporary recording medium 301. Therefore, for example, before recording on the DVD-R7, the recording audio signal file 8 can be reproduced from the temporary recording medium 301 and its contents can be confirmed. Furthermore, when the audio signal recording apparatus 300 according to the third embodiment does not mount the DVD-R7, the recording unit 6 can record data on the temporary recording medium 301 instead of the DVD-R7. Moreover, the audio signal recording device according to the third embodiment
When the same DVD-R drive is shared by another device and the DVD-R drive cannot be used due to the use of the other device, the recording unit 6 records data on the temporary recording medium 301 instead of the DVD-R. it can.

On the other hand, when the temporary recording medium 301 is a semiconductor memory, the recording unit 6 can record data on the temporary recording medium 301 faster than recording on the DVD-R7. Therefore, the recording unit 6 can use the temporary recording medium 301 as a buffer when recording data on the DVD-R7. For example, when data writing is interrupted at the time of vibration or an operation of avoiding scratches on the surface of the DVD-R7, the data at the time of interrupting writing can be held in the temporary recording medium 301. As a result, the recording unit 6 can quickly restart the data writing.

Embodiment 4 FIG. 10 is a block diagram showing a configuration of an audio signal recording device 400 according to Embodiment 4 of the present invention. The audio signal recording device 400 according to the fourth embodiment is similar to the audio signal recording device 400 according to the first embodiment.
Similarly, this is an audio signal recording unit of a DVD-R recorder, which is obtained by adding a synchronization signal generation unit 401 to the configuration similar to that of the first embodiment. Therefore, in the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description of the first embodiment will be referred to.

The recording audio signal generating unit 5 is the same as in the first embodiment.
High-efficiency encoding section 5 for the audio signal output from switch 4
a and a multiplexing unit 5b. Both high efficiency coding and multiplexing are digital signal processing. The synchronization signal generation unit 401 generates a synchronization signal for synchronizing with the digital signal processing. The switch 4 switches the output audio signal in synchronization with the synchronization signal.

For example, it is assumed that the encoding format in the recording audio signal generation section 5 is linear PCM, and the output audio signals are stereo Lch audio signals and Rch audio signals. In that case, the synchronization signal generation unit 401 generates a BCK signal and an LRCK signal, which are rectangular wave voltage signals having a constant frequency, as synchronization signals. Multiplexer 5b
Outputs a recording audio signal as a serial signal synchronized with the BCK signal and the LRCK signal in the following manner.
First, when the LRCK signal is at the high potential H, the Lch audio signal is output, while when the LRCK signal is at the low potential L, the Rch audio signal is output.
b is selected respectively. Next, the multiplexing unit 5b latches the selected audio signal at the rising edge of the BCK signal. Thereby, 0 and 1 of the selected audio signal are determined at the sampling rate defined by the frequency of the BCK signal.

When the multiplexing method of the audio signal is switched from stereo to dual monaural at the time of the above processing by the multiplexing unit 5b, the switch 4 switches, for example, the Rch audio signal to the copy of the Lch audio signal in synchronization with the LRCK signal. Thus, it is possible to prevent a part of one audio signal from being lost and mixed with the other audio signal before and after the switch 4 is switched. As a result, switching of the switch 4 and the multiplexing unit 5
It is possible to avoid noise included in the reproduced sound due to a deviation in synchronization with the processing in b.

It is assumed that, apart from the above case, the audio signal output from the switch 4 is a time-division multi-channel audio signal. The high-efficiency encoding section 5a of the recording audio signal generation section 5 performs high-efficiency encoding of the output audio signal in the order of the input channels. In this case, the synchronization signal generation unit 401 generates a synchronization signal synchronized with the channel switching by the high efficiency encoding unit 5a. When the multiplexing method of the input audio signal to the switch 4 is switched, the switch 4 switches the output audio signal in synchronization with the synchronization signal of the synchronization signal generation unit 401. This makes it possible to match the break of the output audio signal by time division with the switching of the output audio signal by the switch 4. Therefore, it is possible to prevent a part of one output audio signal from being lost before and after the switch 4 is switched and mixed with the other output audio signal. As a result, it is possible to avoid that the reproduced voice includes noise due to a synchronization deviation between the switching of the switch 4 and the processing in the high-efficiency encoding unit 5a.

In the fourth embodiment, the synchronization signal generator 401 generates a synchronization signal, and the switch 4 switches the output audio signal in synchronization with the synchronization signal. Alternatively, the switch 4 may switch the output audio signal in synchronization with the horizontal synchronization signal or the vertical synchronization signal included in the video signal. In that case,
Since the audio signal is synchronized with the horizontal synchronization signal and the vertical synchronization signal of the video signal, for example, the multiplexing method of the audio signal is switched in synchronization with the switching of the frame of the video signal, whereby the audio can be switched naturally.

Embodiment 5 FIG. 11 is a block diagram showing a configuration of an audio signal recording device 500 according to Embodiment 5 of the present invention. The audio signal recording device 500 according to the fifth embodiment is similar to the audio signal recording device 500 according to the first embodiment.
Similarly, this is an audio signal recording unit of a DVD-R recorder, which is the same as the first embodiment except that two fade units 501 and 502 are added. Therefore, in the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description of the first embodiment will be referred to.

The first fade section 501 receives the extracted audio signal from the audio signal extracting section 3 and the synthesized audio signal from the audio signal synthesizing section 10, respectively, and outputs them as input audio signals to the switch 4. The second fade section 502 receives output audio signals from the switch 4 and relays them to the recording audio signal generation section 5. Further, the first fade unit 501 and the second fade unit 502 each receive multiplexing system information from the multiplexing system determining unit 2.

The first fade unit 501 performs the following processing on the extracted audio signal and the synthesized audio signal, and the second fade unit 502 performs the following processing on the output audio signal. When the first fade unit 501 detects switching of the multiplexing method of the multiplexed audio signal from the multiplexing method information, the first fade unit 501 first performs a fade-out process on the extracted audio signal and the synthesized audio signal.
More specifically, the first fade unit 501 starts gradually lowering the volume of the extracted audio signal and the synthesized audio signal from the time of the above detection. Thereafter, by the time of inputting the extracted audio signal corresponding to the switched multiplexing method, the first fade unit 501 lowers the volume of the extracted audio signal and the synthesized audio signal to an inaudible level. Here, the time of the fade-out processing is set to a fixed number of clocks, and is about several tens msec.

After the start of the input of the extracted audio signal corresponding to the switched multiplex system, the first fade unit 501 performs a fade-in process. Specifically, the first fade section 501
Starts gently increasing the volume of the extracted voice signal and the synthesized voice signal from the start of the input, and returns to the original level. Here, the time of the fade-in processing is set to a fixed number of clocks, and is about several tens msec.

When the second fade section 502 detects a change in the multiplexing method of the multiplexed audio signal from the multiplexing information,
First, a fade-out process is performed on the output audio signal.
More specifically, the second fade section 502 starts to gradually lower the volume of the output audio signal from the time of the above detection. Thereafter, by the time the output audio signal corresponding to the switched multiplexing method is input, the second fade unit 502 lowers the volume of the output audio signal to a non-audible level. Here, the time of the fade-out processing is set by a fixed number of clocks, and is several tens of ms.
It is about ec.

After the start of the input of the output audio signal corresponding to the switched multiplex system, the second fade section 502 performs a fade-in process. Specifically, the second fade section 502
Starts gently increasing the volume of the output audio signal from the start of the input, and returns to the original level. Here, the time of the fade-in processing is set to a fixed number of clocks, and is about several tens msec.

At the time of the above fade-out processing,
When the volume of both the input audio signal and the output audio signal decreases to a level at which neither of them can be heard, the switch 4 switches the output audio signal. As a result, the switch 4 can smoothly switch the output audio signal. As a result, it is possible to reduce the generation of discontinuous reproduced sound, particularly the generation of noise when the multiplexing system is switched. For example, in the case of recording a foreign film program of TV broadcasting, discontinuous changes in volume and the like between a foreign film part of bilingual broadcasting and a CM part of stereo broadcasting can be reduced.

As in the fifth embodiment, it is preferable to provide two fade portions before and after the switch 4. Other,
It is also possible to provide only one fade portion before or after the switch 4. However, when the fade unit is provided only before the switch 4, the output audio signal from the switch 4 may include noise due to the switching operation of the switch 4.

[Difference in Operation of Fade Unit According to Position of AD Converter] In the fifth embodiment, the audio signal extraction unit 3 includes the AD converter 3a. Alternatively, for example, the switch 4 may have an AD converter, and only the selected output audio signal may be processed by the AD converter. In that case, the extracted audio signal input to the first fade unit 501 may include an analog signal. Therefore, in the first fade unit 501, the time of the fade-in process and the time of the fade-out process are set to constant values for the analog signal. On the other hand, all the output audio signals of the switch 4 are digital signals.
Therefore, in the second fade unit 502, the time of the fade-in process and the time of the fade-out process are set to a fixed number of clocks in the same manner as described above.

Apart from the switch 4, the recording audio signal generator 5 may have an AD converter. In that case, an analog signal may be included in the output audio signal of the switch 4 input to the second fade unit 502. Therefore, in the second fade section 502, similarly to the first fade section 501, the time of the fade-in process and the time of the fade-out process are set to constant values for analog signals.

Embodiment 6 FIG. 12 is a block diagram showing a configuration of an audio signal recording device 600 according to Embodiment 6 of the present invention. The audio signal recording device 600 according to the sixth embodiment is similar to the audio signal recording device 600 according to the first embodiment.
Similarly, this is an audio signal recording unit of a DVD-R recorder, which is the same as the first embodiment except that two mute units 601 and 602 are added. Therefore, in the sixth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description of the first embodiment will be referred to.

The first mute section 601 receives the extracted audio signal from the audio signal extraction section 3 and the synthesized audio signal from the audio signal synthesis section 10, respectively, and outputs them as input audio signals to the switch 4. The second mute unit 602 receives the output audio signals from the switch 4 and relays them to the recording audio signal generation unit 5. Further, the first mute unit 601 and the second mute unit 602 each receive multiplexing system information from the multiplexing system determining unit 2.

The first mute section 601 performs the following processing on the extracted audio signal and the synthesized audio signal, and the second mute section 602 performs the following processing on the output audio signal. The first mute unit 601 sets mute for the extracted audio signal and the synthesized audio signal when detecting the switching of the multiplexing method of the multiplexed audio signal from the multiplexing information. That is,
The sound volume of the extracted audio signal and the synthesized audio signal is quickly reduced. As a result, the volume of the extracted audio signal and the synthesized audio signal decreases to an inaudible level. After the start of input of the extracted audio signal corresponding to the switched multiplex method, the first mute unit
601 releases the mute. That is, the volume of the extracted voice signal and the synthesized voice signal is quickly raised and returned to the original level.

When the second mute section 602 detects a change in the multiplexing method of the multiplexed audio signal from the multiplexing method information,
Set mute for output audio signal. That is,
Immediately lower the volume of the output audio signal. As a result, the volume of the output audio signal drops to a level that is not audible. After starting the input of the output audio signal corresponding to the switched multiplexing method,
The second mute unit 601 releases the mute. That is, the volume of the output audio signal is quickly raised and returned to the original level.

The switch 4 switches the output audio signal after setting and before canceling the above-mentioned mute, that is, when the volume of both the input audio signal and the output audio signal has decreased to a level at which neither is audible. Thereby, the switch 4 can smoothly switch the output audio signal. as a result,
It is possible to reduce the generation of discontinuous reproduced voice, particularly the generation of noise when the multiplexing system is switched. For example, in the case of recording a TV broadcast foreign movie program, discontinuous changes in volume and the like between the bilingual broadcast foreign movie portion and the stereo broadcast CM portion can be reduced.

In the fifth embodiment, a fade portion is provided before and after the switch 4. On the other hand, in the sixth embodiment, the switch 4
A mute section was installed before and after each. In addition to the above,
A fade section may be provided before or after the switch 4, and a mute section may be provided on the other side.

Generally speaking, the fade processing can reduce the noise at the time of switching the multiplexing system more effectively than the mute processing. Therefore, for example, the first mute unit 60 of the sixth embodiment
When 1 is replaced with a fade portion, noise at the time of switching the multiplexing method included in the audio signal input to the switch 4 can be effectively reduced. However, since the fade section generally has a more complicated configuration than the mute section, a circuit in which the first mute section 601 is replaced with a fade section is more complicated than in the sixth embodiment.

Embodiment 7 FIG. 13 is a block diagram showing a configuration of an audio signal recording device 700 according to Embodiment 7 of the present invention. The audio signal recording device 700 according to the seventh embodiment is similar to the audio signal recording device 700 according to the first embodiment.
Similarly, it is an audio signal recording unit of the DVD-R recorder. In the seventh embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description of the first embodiment will be referred to.

The audio signal recording apparatus 700 according to the seventh embodiment has three pairs of multiplexed audio signal input sections and a multiplexing scheme discriminating section.
The first multiplex audio signal input unit 1a inputs an intermediate frequency signal from the tuner Ch, and detects a first multiplex audio signal from the intermediate frequency signal. The second multiplex audio signal input unit 1b inputs the second multiplex audio signal through the external audio input terminal Sin.
For example, another DVD player or digital video camera is connected to the external audio input terminal Sin. The third multiplex audio signal input unit 1c inputs the third multiplex audio signal from the personal computer PC. All of the first to third multiplexed audio signals are output to the audio signal extraction unit 3.

The first and second multiplexing mode discriminators 2a and 2b
The multiplexing method is determined from the first and second multiplexed audio signals input to the first and second multiplexed audio signal input units 1a and 1b, respectively. Further, the first and second multiplexing method discriminating units 2a and 2b respectively create first and second multiplexing method information corresponding to the multiplexing methods discriminated. On the other hand, the multiplexing system information input unit 2c inputs the multiplexing system information from the personal computer PC separately from the third multiplexed audio signal input to the third multiplexed audio signal input unit 1c. The multiplexing method information input unit 2c outputs the input multiplexing method information as third multiplexing method information.

The audio signal extracting section 3 demodulates audio signals of a plurality of channels from each of the first through third multiplexed audio signals, and extracts them as extracted audio signals. At this time, each format of the extracted audio signal differs depending on the type of the multiplexed audio signal.

The format conversion section 701 includes the audio signal extraction section 3
And extracts the extracted audio signal, and adjusts each format to a certain one. After that, an extracted audio signal of a certain format is input to the switch 4. As a result, the format of the output audio signal from the switch 4 becomes uniform. Therefore, the high-efficiency encoding unit 5 of the recording audio signal generation unit 5
For a, the same high-efficiency encoding process may be performed on the audio signal output from the switch 4. Therefore, the high efficiency coding unit 5a
Can easily perform efficient encoding of the output audio signal. In addition, since the setting of the high-efficiency encoding section 5a for the format of the output audio signal can be made constant, interruption for resetting can be avoided. As a result, since the recording audio signal can be generated substantially continuously, the recording unit can continuously record the recording audio signal file.

<< Eighth Embodiment >> FIG. 14 is a block diagram showing a configuration of an audio signal recording apparatus 110 according to an eighth embodiment of the present invention. The audio signal recording device 110 according to the eighth embodiment is similar to the audio signal recording device 110 according to the first embodiment.
Similarly, it is an audio signal recording unit of the DVD-R recorder. The audio signal recording device 110 according to the eighth embodiment is different from the audio signal recording device 110 according to the first embodiment (see FIG. 1) in that a multiplex method information input unit 112 is provided instead of the multiplex method discriminating unit 2. The other configurations are the same as those of the first embodiment. Therefore, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof is the same as that of the first embodiment.

The multiplexing system information input unit 112 inputs multiplexing system information from the outside independently of the corresponding multiplexed audio signal. The input multiplexing system information is stored in the switch 4 and the recording unit 6.
Output to For example, as shown in FIG. 14, a recording audio signal file may be input to the multiplex audio signal input unit 1 and a multiplex method information file may be input to the multiplex method information input unit 112 from an external personal computer PC.

In addition, the multiplex audio signal input unit 1 and the multiplex method information input unit 112 are connected to a common network interface. Thus, of the data transmitted from the outside via the network, the recording audio signal file may be input to the multiplex audio signal input unit 1 and the multiplex method information file may be input to the multiplex method information input unit 112.

The input of the multiplexing system information to the multiplexing system information input unit 112 is preferably before the input of the corresponding multiplexed audio signal to the multiplexed audio signal input unit 1. Thereby, the switching timing of the output audio signal by the switch 4 is
This can be set in advance before the input audio signal is input to the switch 4. Therefore, unlike the first embodiment, the switch 4 does not need to read the multiplex method information at the time of switching. Therefore,
The switch 4 can easily and reliably switch the output audio signal.

Further, different from the first embodiment, the recording unit 6 can record the multiplex format information file on the DVD-R 7 before the recording audio signal file. Therefore, the recording time of the multiplex method information file can be saved when the recording unit 6 performs the title end processing. Therefore, recording of the next title can be started quickly.

<< Embodiment 9 >> FIG. 15 is a block diagram showing a configuration of an audio signal recording apparatus 310 according to Embodiment 9 of the present invention. The audio signal recording device 310 according to the ninth embodiment is different from the audio signal recording device 310 according to the eighth embodiment.
Similarly, it is an audio signal recording section of a DVD-R recorder, and is the same as the eighth embodiment except that a temporary recording medium 311 is added. Therefore, in the ninth embodiment, the same components as those in the eighth embodiment are denoted by the same reference numerals as those in the eighth embodiment, and the description thereof will be the same as that of the eighth embodiment. Further, the temporary recording medium 311 and its operation are exactly the same as those of the temporary recording medium 301 of the third embodiment.
Therefore, the description of Example 3 is cited.

Embodiment 10 FIG. 16 shows Embodiment 10 of the present invention.
FIG. 4 is a block diagram showing the configuration of an audio signal recording device 410 according to FIG. The audio signal recording device 410 according to the tenth embodiment is an audio signal recording unit of a DVD-R recorder, similar to the eighth embodiment, and has a configuration similar to that of the eighth embodiment with the addition of a synchronization signal generation unit 411. Therefore, in the tenth embodiment, the same components as those of the eighth embodiment are denoted by the same reference numerals as those of the eighth embodiment, and the description thereof will be the same as that of the eighth embodiment. Further, the synchronization signal generation unit 411 and its operation are exactly the same as those of the synchronization signal generation unit 401 of the fourth embodiment. Therefore, the description of Example 4 is cited.

Embodiment 11 FIG. 17 shows Embodiment 1 of the present invention.
1 is a block diagram showing a configuration of an audio signal recording device 510 according to Example 1. The audio signal recording device 510 according to the eleventh embodiment is an audio signal recording unit of a DVD-R recorder as in the eighth embodiment, and has two fade units 511 and 5 in the same configuration as the eighth embodiment.
12 is added. Therefore, in the eleventh embodiment, the same components as those in the eighth embodiment are denoted by the same reference numerals as those in the eighth embodiment, and the description thereof is the same as that of the eighth embodiment. Further, the two fade portions 511 and 512 and their functions are exactly the same as the two fade portions 501 and 502 of the fifth embodiment. Therefore,
The description of Example 5 is cited.

Embodiment 12 FIG. 18 shows Embodiment 1 of the present invention.
2 is a block diagram illustrating a configuration of an audio signal recording device 610 according to Embodiment 2. The audio signal recording device 610 according to the twelfth embodiment is an audio signal recording unit of a DVD-R recorder as in the eighth embodiment, and has two mute units 611 and 6 similar to the eighth embodiment.
12 is added. Therefore, in the twelfth embodiment, the same components as those of the eighth embodiment are denoted by the same reference numerals as those of the eighth embodiment, and the description thereof will be the same as that of the eighth embodiment. Further, the two mute units 611 and 612 and their operations are exactly the same as the two mute units 601 and 602 of the sixth embodiment. Therefore,
The description of Example 6 is cited.

Embodiment 13 FIG. 19 shows Embodiment 13 of the present invention.
FIG. 3 is a block diagram showing a configuration of an audio signal recording device 900 according to Embodiment 3. The audio signal recording apparatus 900 according to the thirteenth embodiment is an audio signal recording unit of a DVD-R recorder as in the first embodiment. The audio signal recording apparatus 900 according to the thirteenth embodiment differs from the audio signal recording apparatus 900 according to the first embodiment (see FIG. 1) in that an encoding processing unit 905 is provided instead of the recording audio signal generation unit 5. The other configurations are the same as those of the first embodiment. Therefore, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof is the same as that of the first embodiment.

The encoding processing unit 905 inputs the output audio signal from the switch 4 and the multiplexing system information from the multiplexing system determining unit 2. The encoding processing unit 905 determines the multiplexing method from the multiplexing method information, and selects an encoding format according to the multiplexing method. For example, the number of channels, the bit rate, the number of effective audio bits (the number of quantization bits), and the sampling frequency are selected. Further, when the multiplex system is switched, the encoding format is also switched.

With the encoding format selected according to the multiplexing method, the encoding processing unit 905 performs high-efficiency encoding on the output audio signal corresponding to the multiplexing information, and generates a recording audio signal. I do. Thus,
The encoding processing unit 905 can generate a high-quality recording audio signal as compared with the case of performing high-efficiency encoding in a fixed encoding format. Therefore, the generation of the recording audio signal by the encoding processing unit 905 is particularly suitable for recording high-quality audio such as a music program.

The recording section 6 receives a recording audio signal from the encoding section 905. The recording unit 6 collects the recording audio signals of the respective titles into one recording audio signal file with the recording audio signals as different titles for each encoding format. That is, each time the encoding format is switched, the recording unit 6 records the recording audio signal as another title. Therefore, the encoding format of the recording audio signal is constant within one title. Therefore, the recording audio signal can be reproduced by a DVD player conforming to the DVD video standard.

However, the recording unit 6 writes title-related information each time one title is completed, and changes the encoding format before starting recording the next title.
As a result, a series of recording audio signals are likely to be discontinuous when the title is switched. When reproducing such a recording audio signal, the reproduced audio is likely to be unnatural and discontinuous when the title is switched. Therefore, the mute processing or the fade processing may be performed on the recording audio signal at the same time when the encoding processing unit 905 switches the encoding format. Thereby, similarly to the fifth and sixth embodiments, it is possible to reduce the generation of discontinuous sounds.

Before the user starts recording the title, the encode processing unit 90 is operated by a mechanical switch B3 such as a button.
Switching of the encoding format for 5 may be suppressed in advance. By doing so, one DVD
-An increase in the number of titles recorded in R7 can be suppressed.
Therefore, for example, one DVD as in the DVD video standard
-If the maximum number of titles that can be recorded in R7 is limited, it is possible to prevent the number of titles from reaching the upper limit before data is recorded in all recording areas on DVD-R7.

<< Embodiment 14 >> FIG. 20 shows Embodiment 14 of the present invention.
4 is a block diagram showing a configuration of an audio signal recording device 910 according to Example 4. The audio signal recording device 910 according to the fourteenth embodiment is an audio signal recording unit of a DVD-R recorder as in the eighth embodiment. The audio signal recording device 910 according to the fourteenth embodiment is different from the audio signal recording device 910 according to the eighth embodiment (see FIG. 14) in that an encoding processing unit 915 is provided instead of the recording audio signal generation unit 5. Other configurations are the same as those of the eighth embodiment, and therefore, they are denoted by the same reference numerals as those of the eighth embodiment, and the description thereof is the same as that of the eighth embodiment.

When the multiplexing system information input unit 801 is inputting the multiplexing system information before the corresponding multiplexed audio signal, the encoding processing unit 915 can preset the switching of the encoding format according to the multiplexing system information. Therefore, the encoding processing unit 915 can easily and reliably switch the encoding format, and can generate a high-quality recording audio signal. The other operations of the encoding processing unit 915 are exactly the same as those of the encoding processing unit 905 of the thirteenth embodiment.

[Embodiment 15] [Configuration of audio signal recording apparatus according to Embodiment 15] FIG.
FIG. 16 is a block diagram illustrating a configuration of an audio signal recording device 1000 according to Embodiment 15 of the present invention. The audio signal recording apparatus 1000 according to the fifteenth embodiment is configured by a personal computer as follows.

The tuner board 1010 has a tuner 101 inside.
4, the first multiplex audio signal input unit 1011, the multiplex method determination unit 101
2. Includes a first audio signal extraction unit 1013. The tuner 1014 receives an electric wave of TV broadcast through the external antenna A or the cable Ca and converts it into an intermediate frequency signal. Here, the TV broadcast may be an analog broadcast or a digital broadcast. Furthermore, TV broadcasts are generally audio multiplex broadcasts,
For example, it includes monaural, stereo, or bilingual broadcasting. The intermediate frequency signal is input to a first multiplex audio signal input unit 1011. First multiplex audio signal input section 1011 detects a first multiplex audio signal from the intermediate frequency signal. The detected first multiplexed audio signal is output to first audio signal extraction section 1013.

The multiplexing scheme discriminating section 1012 discriminates the multiplexing scheme from the first multiplexed audio signal detected by the first multiplexed audio signal input section 1011. Here, the multiplexing method includes monaural, stereo, dual monaural such as bilingual broadcasting, multi-lingual with three or more channels, multi-channel sound for three-dimensional sound (front, surround, and other sound effects, etc.), and karaoke sound. Includes special multi-channel audio. Further, the multiplexing method determining unit 1012 creates first multiplexing method information corresponding to the determined multiplexing method. The first multiplex method information is the same as the multiplex method information of the first embodiment. Therefore, the description thereof is the same as that of the first embodiment.

The first audio signal extraction unit 1013 demodulates the audio signals of a plurality of channels multiplexed on the first multiplexed audio signal, and extracts the audio signals of each channel as the first extracted audio signal. I do. Here, the type of the first extracted audio signal includes a monaural audio signal, an Lch audio signal and an Rch audio signal in stereo broadcasting, a main audio signal and a sub audio signal in dual monaural broadcasting, and the like. Further, the first audio signal extraction unit 1013 includes an AD converter 1013a. The AD converter 1013a converts an analog signal of the first extracted audio signal into a digital signal by linear PCM. As a result, the first extracted audio signal output from the first audio signal extraction unit 1013 is a digital signal in all channels.

The network board 1020 includes therein a second multiplexed audio signal input unit 1021, a multiplexed system information input unit 1022, a second audio signal extraction unit 1023, and a network interface.
Including 1024. The network board 1020 is connected to, for example, an external network LAN. For example, a video server is provided on the network LAN, and transmits a multiplexed audio signal and its multiplexing system information in separate packets. The network interface 1024 receives each packet from the network LAN, receives the multiplexed audio signal to the second multiplexed audio input unit 1021, and inputs the multiplexed information to the multiplexed information input unit 1022.
To each output.

The second multiplex audio signal input unit 1021 inputs the multiplex audio signal from the network interface 1024 as a second multiplex audio signal. On the other hand, the multiplex method information input unit
Reference numeral 1022 inputs multiplexing method information from the network interface 1024 as second multiplexing method information.

The second audio signal extracting section 1023 demodulates the audio signals of a plurality of channels, which are generally multiplexed into the second multiplexed audio signal, and extracts the audio signals of each channel as the second extracted audio signal. I do. Here, the type of the second extracted audio signal includes a monaural audio signal, an Lch audio signal and an Rch audio signal in a stereo broadcast, and the like. The multiplex audio signal output from the network interface 1024 is a digital signal. Therefore, the second extracted audio signal output from the second audio signal extraction unit 1023 is a digital signal in all channels.

The main memory 1040 is a RAM. The main memory 1040 inputs the first extracted audio signal from the first audio signal extraction unit 1013 and the second extracted audio signal from the second audio signal extraction unit 1023 as input audio signals, and temporarily stores them. Further, the main memory 1040 is provided with a multiplexing type discriminating unit.
The first multiplex method information from 1012 is input to the multiplex method information input unit 10
The second multiplexing method information is input from 22 and temporarily stored.

The digital signal processing section 1100 reads some of the first extracted audio signal and the second extracted audio signal from the main memory 1040 and synthesizes a new audio signal therefrom. The synthesized audio signal (synthesized audio signal) is temporarily stored in main memory 1040 as an input audio signal together with other extracted audio signals. Here, the synthesized audio signal includes, for example, a surround effect audio signal, a reverberation audio signal, a subwoofer audio signal, a center effect audio signal, and the like. The type of the synthesized voice signal is set by controlling the digital signal processing unit 1100 by the CPU 1050.

The CPU 1050 executes a predetermined program stored in the main memory 1040. Accordingly, a recording audio signal is generated from the input audio signal stored in main memory 1040 as follows based on the multiplexing scheme information stored in main memory 1040. For example, the CPU 1050 reads the first or second multiplex method information from the main memory 1040. The CPU 1050 selects a first or second extracted audio signal from the main memory 1040 or some channels of a synthesized audio signal synthesized therefrom based on the multiplexing system information, and outputs a high-efficiency encoding unit as an output audio signal. Output to 1110. The CPU 1050 switches the output audio signal particularly when detecting a change in the multiplexing method from the multiplexing method information.

The user can set the multiplex system of the output audio signal by the program executed by the CPU 1050. However,
The type of multiplexing method set as such is limited to one type in one title. Due to the limitation, Example 1
5, the audio signal recording apparatus 1000 converts the audio signal to the DVD-R7, and
It can be recorded so that it can be reproduced by the player. When the multiplexed audio signal has a specific multiplexing method, the CPU 1050 selects an output audio signal based on the multiplexing method set by the user. For example, when the user sets the selection of the main audio signal, the CPU 1050 selects the main audio signal as the output audio signal when the multiplexing method of the multiplex audio signal is dual monaural.

The high-efficiency encoding section 1110 encodes the output audio signal in a predetermined encoding format under the control of the CPU 1050. The encoding format is, for example,
Includes linear PCM (pulse code modulation), MPEG / audio, Dolby Digital (hereinafter referred to as AC-3), and the like. The user can select an encoding format by a program executed by the CPU 1050.

The CPU 1050 multiplexes the audio signals encoded by the high-efficiency encoding section 1110, and generates a recording audio signal as one serial signal. Thus, the CPU 1050
Functions as a recording audio signal generation unit in the fifteenth embodiment.

The CPU 1050 converts the recording audio signal into one recording audio signal file for at least one title.
1080. Further, the CPU 1050 multiplexes the recording audio signal file 1080 with the video signal processing unit and the sub-video signal processing unit (both not shown) in the personal computer, together with the respective files of the video signal and the sub-video signal. Output to R drive 1060.

The DVD-R drive 1060 writes data to the DVD-R 7 in the same manner as the recording section 6 of the first embodiment. The description of the writing operation is the same as that of the first embodiment. The DVD-R drive 1060 includes a RAM 1061. The DVD-R drive 1060 includes the first multiplex method information from the multiplex method discrimination unit 1012 and the multiplex method information input unit 10.
The second multiplexing method information from 22 is temporarily stored in the RAM 1061 as a multiplexing method information file 1090, respectively. As in the first embodiment, the multiplexing method information file 1090 is obtained by combining the multiplexing method information of the title with the elapsed time information.
The multiplex format information file 1090 is an audio signal file for recording.
After recording on DVD-R7 of 1080, it is recorded on DVD-R7.

The DVD-R drive 1060 stores the recording audio signal file 1080 and the multiplex format information file 1090 in a DVD.
-Recording can be temporarily performed on the hard disk 1301 and the buffer memory 1302 before recording on R7.

The hard disk 1301 has such a large capacity that the entire recording audio signal file 1080 and the multiplex system information file 1090 can be recorded. Therefore, for example, DVD-
Before recording on R7, the recording audio signal file 1080 can be reproduced from the hard disk 1301 to check its contents. Furthermore, when the DVD-R 7 is not mounted on the DVD-R drive 1060, the DVD-R drive 1060 can record data on the hard disk 1301 instead of the DVD-R 7. In addition, the DVD-R drive 1060 writes and reads data to and from the DVD-R,
Other data can be recorded to 01.

The buffer memory 1302 is preferably a RAM, and can record data at a higher speed than DVD-R7. Therefore, the DVD-R drive 1060 is used for vibration or DVD-R drive.
When data writing is interrupted during an operation of avoiding a scratch or the like on the surface of R7, data at the time of interrupting writing can be held in the buffer memory 1302. As a result, DVD-R drive
The 1060 can quickly resume data writing.

Since the structure of the DVD-R7, particularly the physical format, is exactly the same as that of the first embodiment, the description of the first embodiment will be cited.

[Audio Signal Recording Apparatus 1000 According to Embodiment 15]
Operation] The operation of the audio signal recording apparatus 1000 according to Embodiment 15 configured as described above will be described below.

[0213] The tuner board 1010 receives the radio wave of the TV broadcast through the antenna A or the cable Ca. First multiplex audio signal input section 1011 detects a first multiplex audio signal from the radio wave. First audio signal extraction section 1013 converts the first multiplexed audio signal into a first extracted audio signal. The first extracted audio signal is temporarily stored in main memory 1040. The multiplexing method determining unit 2 determines the multiplexing method of the first multiplexed audio signal and creates first multiplexing method information. After that, the first multiplex method information is temporarily stored in the main memory 1040.

The network board 1020 is a network board.
The second multiplex audio signal and the second multiplex method information are input independently from the LAN. The second multiplex method information is stored in the main memory 1040 and the RAM 10 in the DVD-R drive 1060.
61 is temporarily stored.

[0215] The digital signal processing unit 1100, for example, converts the stereo L of the first extracted audio signal and the second extracted audio signal.
The ch audio signal and the Rch audio signal are read from the main memory 1040. Further, a stereo Lch audio signal copy, an Rch audio signal copy, and a surround effect audio signal are synthesized from the read audio signal. These synthesized voice signals are temporarily stored in the main memory 1040 as input voice signals.

<Selection of output audio signal by CPU 1050>
The user previously sets the multiplexing method of the output audio signal to, for example, stereo by a program executed by the CPU 1050.
Further, when the multiplexing method of the first multiplexed audio signal is switched from stereo to dual monaural, the main audio signal is preset to be selected. Based on such settings, the CPU 1050 selects an output audio signal from the input audio signals, for example, as follows.

When the recording of one title is started and the multiplexing method of the first multiplexed audio signal is determined to be stereo based on the first multiplexing method information, the CPU 1050 outputs the first extracted audio signal among the input audio signals. Are selected between the Lch audio signal and the Rch audio signal. Then in the same title,
It is assumed that the multiplexing method of the first multiplexed audio signal is switched from stereo to dual monaural. The CPU 1050 determines the switching from the first multiplex method information. At that time, the CPU 1050 selects the Lch audio signal of the first extracted audio signal and its copy from the input audio signals. here,
As described above, the copy of the Lch audio signal is one of the synthesized audio signals that were previously synthesized by the digital signal processing unit 1100 and temporarily stored in the main memory 1040. In this way, the output audio signal can be substantially switched from the stereo audio signal to the dual monaural main audio signal while the multiplexing method of one title is set to stereo.

The same applies to the case where the user sets the selection of the sub audio signal. That is, when it is determined from the multiplexing method information that the multiplexing method has been switched from stereo to dual monaural in the same title, the CPU 1050 selects an Rch audio signal and a copy of the Rch audio signal from the input audio signals. Here, the copy of the Rch audio signal is previously synthesized by the digital signal processing unit 1100 as described above, and
This is one of the synthesized speech signals temporarily stored in 1040. In this way, the output audio signal can be substantially switched from the stereo audio signal to the dual monaural sub audio signal while the multiplexing method of one title is set to stereo.
Further, when the multiplexing method of the multiplexed audio signal is switched from stereo to monaural, the output audio signal can be substantially switched from stereo to monaural while the multiplexing method of one title is set to stereo.

[0219] Instead of the above stereo setting, the user presets the multiplexing method of the output audio signal to surround.
Based on such settings, the CPU 1050 selects an output audio signal from the input audio signals, for example, as follows.

When the recording of one title is started, if the multiplexing method of the multiplexed audio signal is determined to be surround from the multiplexing method information, the CPU 1050 selects a surround audio signal of 6 channels from the input audio signals. After that, when it is determined from the multiplex method information that the multiplex method has been switched from surround to stereo in the same title, the switch 4
Selects a stereo audio signal and a surround effect audio signal from the input audio signals. That is, the surround effect audio signal is read from the main memory 1040 as the remaining four-channel audio signals excluding the two-channel stereo audio signals. Here, the surround effect audio signal is synthesized in advance by the digital signal processing unit 1100 as described above,
This is one of the synthesized speech signals temporarily stored in the main memory 1040. In this way, when the multiplexing method of the multiplexed audio signal is switched from surround to stereo during the recording of one title, a surround effect audio signal having the same number of channels as the reduced number of extracted audio signals can be supplemented. Thereby, the recording of the title can be substantially continued.

When switching the output audio signal, the CPU 1050 preferably performs a fade process on the output audio signal before and after the switching. That is, similarly to the fade unit of the fifth embodiment, the output audio signal before switching is faded out, and the output audio signal after switching is faded in. As a result, when the volume of the output audio signal decreases to a level that is not audible, the CPU 1050 switches the output audio signal. As a result, it is possible to reduce the generation of discontinuous audio when the multiplex system is switched. For example, commercial T
In the case of recording a movie program of V station, discontinuous changes in volume and the like between a movie portion of a bilingual broadcast and a CM portion of a stereo broadcast can be reduced.

Instead of the fade process, the CPU 1050 may perform a mute process on the output audio signal. That is, similarly to the mute unit of the sixth embodiment, the mute is set for the output audio signal before switching, and the mute is released after the switching. As a result, when the volume of the output audio signal falls to a level that is not audible, the CPU 1050 switches the output audio signal. As a result, it is possible to reduce the generation of discontinuous audio when the multiplex system is switched.

The CPU 1050 encodes and multiplexes the output audio signal read from the main memory 1040 with high efficiency,
-Output to R drive 1060. DVD-R drive 1060
Records the recording audio signal file 1080 in a substantially continuous recording area on the DVD-R7. That is, the recording audio signal file 1080 is recorded in a continuous recording area with a recording area for a video signal, a sub-video signal, a synchronization signal, address information on a recording medium, and an error correction code interposed therebetween.

The DVD-R drive 1060 creates padding information (dummy data) having the same information amount as the insufficient recording audio signal during the underbuffer run. The padding information is inserted into the missing portion in the recording audio signal file 1080. As a result, the DVD-R drive 1060 avoids interruption of the recording operation during the underbuffer run, and prevents interruption of the data of the recording audio signal file 1080.

Thus, the DVD-R drive 1060 records the recording audio signal file 1080 in a substantially continuous recording area on the DVD-R7. As a result, the DVD-R drive 1060 can reduce the execution of linking particularly when recording the recording audio signal file 1080. Thus, in the fifteenth embodiment, it is possible to prevent a reduction in recording capacity and an increase in processing time due to linking.

After the recording of the recording audio signal file 1080 is completed, the DVD-R drive 1060
Is read from the RAM 1061 and recorded on the DVD-R7.
The data format on the DVD-R7 is exactly the same as that of the first embodiment. Therefore, the description thereof is the same as that of the first embodiment.

Thus, the audio signal from the DVD-R 7 recorded by the DVD-R drive 1060 according to the fifteenth embodiment is
As in the first embodiment, the data can be reproduced by a DVD player conforming to the DVD video standard.

In the fifteenth embodiment, it is preferable that the time when the second multiplex method information is input to the multiplex method information input unit 1022 be changed to the second multiplex sound signal corresponding to the second multiplex method information. It is before the time of input to the signal input unit 1021. Thus, the CPU 1050 can set in advance the timing of switching of the output audio signal read from the main memory 1040 for the second extracted audio signal before the reading.

Further, the DVD-R drive 1060 can record the multiplex method information file on the DVD-R 7 before the recording audio signal file for the second multiplex method information. Therefore, the recording time of the multiplex format information file can be saved when the DVD-R drive 1060 finishes the title. Therefore, recording of the next title can be started quickly.

In the fifteenth embodiment, the multiplexing system discriminating unit, the audio signal extracting unit, the digital signal processing unit, and the high-efficiency encoding unit are configured as hardware. In addition, the CPU 1050 may be caused to function as a multiplexing scheme discriminating section, an audio signal extracting section, a digital signal processing section, or a high-efficiency encoding section by a predetermined program. In that case, the multiplex audio signal input
A converter is included to convert the multiplexed audio signal to a digital signal when the multiplexed audio signal is an analog signal.

In any of the above embodiments, instead of configuring the multiplexing method discriminating section, audio signal extracting section, switch or recording audio signal generating section as hardware, the CPU is made to function as each by a predetermined program. Is also good.

In the above embodiment, the recording medium is DVD-R
And In addition, it may be a magnetic recording medium, a magneto-optical recording medium (MO), a semiconductor memory, or a magnetic tape that is removable from a recording device and a reproducing device.

[0233]

As described above, the audio signal recording apparatus according to the present invention can record the multiplex system information of the audio signal in a file different from the audio signal. Therefore, when reproducing the audio signal recorded by the audio signal recording device according to the present invention, the audio signal reproducing device can select whether or not to refer to the multiplex method information. In particular, the above audio signal recording device
It is assumed that the terminal supports the VD video standard. In this case, the data structure of the audio signal and the like recorded by the audio signal recording apparatus has a multiplexing format information file not conforming to the DVD video standard in addition to the portion specified by the DVD video standard. However, the audio signal reproducing device conforming to the DVD video standard can prevent the multiplexing format information file from being referred to when reproducing the audio signal. Therefore, the audio signal reproducing device conforming to the DVD video standard can reproduce the audio signal recorded by the above-described audio signal recording device without extending the conventional configuration.

The audio signal reproducing apparatus according to the present invention can refer to the multiplex system information file when reproducing the audio signal recorded by the above-described audio signal recording apparatus according to the present invention. Therefore, when the above-described audio signal recording apparatus records a program that switches between bilingual broadcasting and stereo broadcasting, for example,
The audio signal reproducing apparatus according to the present invention can reproduce, for example, only bilingual broadcasts by referring to the multiplex system information file.

In the audio signal recording medium according to the present invention, a file of multiplex system information of the audio signal is recorded as a file separate from the audio signal. Therefore, when reproducing the audio signal recorded on the recording medium, the audio signal reproducing device can select whether or not to refer to the multiplex method information. In particular, it is assumed that the audio signal recording medium according to the present invention is compatible with the DVD video standard. In such a case, the audio signal reproducing apparatus conforming to the DVD video standard may be the DV signal according to the present invention.
When reproducing the audio signal recorded in D, it is possible not to refer to the multiplex system information. Therefore, an audio signal can be reproduced in the same manner as a DVD conforming to the conventional DVD video standard. On the other hand, the audio signal reproducing apparatus according to the present invention can refer to the multiplex system information file when reproducing the audio signal recorded on the audio signal recording medium according to the present invention.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an audio signal recording device 100 according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a recording medium D according to the first embodiment of the present invention.
It is a figure which shows VD-R7. (a) is a perspective view showing the entire appearance of the DVD-R7 and the state of laser irradiation from the pickup P of the DVD player. (b) is an enlarged view of the area A surrounded by the broken line in (a) when viewed from the back surface.

FIG. 3 illustrates a radial push-pull signal S0, a wobble signal Sw, and a radial push-pull signal S0 read from a DVD-R7 according to the first embodiment of the present invention.
FIG. 3 is a diagram for explaining a pre-pit signal Sp.
(a), (b), (c), (d), and (e) are the radial push-pull signal S0, the first filtered signal S1, and the wobble signal S, respectively.
w, the second filtered signal S2, and the pre-pit signal Sp.

FIG. 4 is a diagram showing a physical format on a recording area of a DVD-R7 according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a data format in a data area 7e of a recording area on the DVD-R7 according to the first embodiment of the present invention.

FIG. 6 shows a video signal V and a sub-video signal recorded in the title A recording area 23a on the DVD-R7 according to the first embodiment of the present invention.
FIG. 3 is a diagram in which P and audio signals S are arranged in parallel and in the order of broadcast time of title A.

FIG. 7 shows a data format of title-related information 30 on title A recorded on DVD-R7 according to the first embodiment of the present invention.

FIG. 8 is a block diagram illustrating an audio signal reproduction device 200 according to Embodiment 2 of the present invention.

FIG. 9 is a block diagram illustrating a configuration of an audio signal recording device 300 according to a third embodiment of the present invention.

FIG. 10 shows an audio signal recording device 400 according to Embodiment 4 of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 11 shows an audio signal recording device 500 according to Embodiment 5 of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 12 shows an audio signal recording device 600 according to Embodiment 6 of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 13 illustrates an audio signal recording device 700 according to a seventh embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 14 illustrates an audio signal recording device 110 according to an eighth embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 15 illustrates an audio signal recording device 310 according to a ninth embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

FIG. 16 shows an audio signal recording device 41 according to Embodiment 10 of the present invention.
FIG. 3 is a block diagram showing a configuration of 0.

FIG. 17 shows an audio signal recording device 51 according to Embodiment 11 of the present invention.
FIG. 3 is a block diagram showing a configuration of 0.

FIG. 18 shows an audio signal recording device 61 according to a twelfth embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of 0.

FIG. 19 shows an audio signal recording device 90 according to Embodiment 13 of the present invention.
FIG. 3 is a block diagram showing a configuration of 0.

FIG. 20 shows an audio signal recording device 91 according to Embodiment 14 of the present invention.
FIG. 3 is a block diagram showing a configuration of 0.

FIG. 21 shows an audio signal recording device 10 according to Embodiment 15 of the present invention.
It is a block diagram which shows the structure of 00.

[Explanation of symbols]

 100 Audio signal recording device 1 Multiplexed audio signal input unit 2 Multiplexing type discriminating unit 3 Audio signal extraction unit 3a A / D conversion unit 4 Switch 5 Recording audio signal generation unit 5a High efficiency encoding unit 5b Multiplexing unit 6 Recording unit 6a Semiconductor laser 6b Temporary storage unit 7 DVD-R 8 Recording audio signal file 9 Multiplex information file 10 Audio signal synthesis unit 11 Format conversion unit A Antenna Ca cable Ch Tuner B1 Button for setting input to audio signal synthesis unit 10 B2 Switch 4 Button for setting input of B3 Button for inputting setting to audio signal generator 5 for recording

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/10 311 G11B 27/00 D 20/12 27/02 H 27/00 G10L 9/18 J M ( 72) Inventor Hideki Kurumi 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term (reference) 5D044 AB05 BC01 BC05 CC04 CC09 DE02 DE03 DE12 DE43 DE54 DE57 DE58 GK04 GK12 5D045 DA20 DB01 5D110 AA13 AA16 CB CB04 CB07 CC06 CF05 DA04 DB02 DC19 DC22

Claims (27)

[Claims] At least one multiplexed audio signal input unit for externally inputting at least one multiplexed audio signal; determining a multiplexing method of the multiplexed audio signal input to the multiplexed audio signal input unit, and determining the multiplexing method A multiplexing scheme discriminating section for outputting a result as multiplexing scheme information; for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input section and outputting as a plurality of extracted audio signals. An audio signal extraction unit for inputting an input audio signal including the extracted audio signal, outputting at least one of the input audio signals as an output audio signal, and switching the output audio signal according to a predetermined input A switch; a recording audio signal generation unit for generating a recording audio signal based on the output audio signal from the switch; and Audio signal recording apparatus having; recording unit for recording on a recording medium and a multiplexing system information as different files. 2. An at least one multiplex audio signal input unit for externally inputting at least one multiplex audio signal; a multiplex method information input unit for externally inputting multiplex method information of the multiplex audio signal; An audio signal extraction unit for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the audio signal input unit and outputting the extracted audio signals as a plurality of extracted audio signals; inputting an input audio signal including the extracted audio signal; A switch for outputting at least one of the input audio signals as an output audio signal and switching the output audio signal in accordance with a predetermined input; a recording audio signal based on the output audio signal from the switch A recording audio signal generating unit for generating a recording audio signal; and recording the recording audio signal and the multiplexing format information as separate files on a recording medium. Recording of the order; audio signal recording apparatus having a. 3. A format converter for converting each format of the input audio signal to the switch before inputting to the switch, adjusting the format to a predetermined one, and outputting the signal to the switch. The audio signal recording device according to claim 1 or 2. 4. At least one multiplexed audio signal input section for externally inputting at least one multiplexed audio signal; determining a multiplexing method of the multiplexed audio signal input to the multiplexed audio signal input section, and determining the multiplexing method A multiplexing method discriminating unit for outputting a result as multiplexing method information; for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input unit, and outputting the extracted signals as a plurality of extracted audio signals. An audio signal extraction unit; an audio signal temporary storage unit for temporarily storing an input audio signal including the extracted audio signal;
A recording audio for reading out, as an output audio signal, a signal specified by the multiplexing method information from the input audio signals stored in the audio signal temporary storage unit, and generating a recording audio signal from the output audio signal. Signal generator;
And a recording unit for recording the recording audio signal and the multiplexing system information as separate files on a recording medium. 5. At least one multiplexed audio signal input unit for externally inputting at least one multiplexed audio signal; a multiplexing system information input unit for externally inputting multiplexing system information of the multiplexed audio signal; An audio signal extraction unit for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the audio signal input unit and outputting the extracted audio signals as a plurality of extracted audio signals; An audio signal temporary storage unit for storing; among the input audio signals stored by the audio signal temporary storage unit, a signal specified according to the multiplexing scheme information is read as an output audio signal, and from the output audio signal A recording audio signal generating unit for generating a recording audio signal; and recording the recording audio signal and the multiplexing system information as separate files. Recording unit for recording the medium; audio signal recording apparatus having a. 6. The audio signal recording device according to claim 1, further comprising an audio signal synthesizing unit for synthesizing a synthesized audio signal based on the extracted audio signal, wherein the input audio signal to the switch is the synthesized audio signal. The audio signal recording device according to claim 1, further comprising: 7. A digital signal processing unit for reading out the extracted audio signal from the audio signal temporary storage unit, performing digital signal processing, and storing the digital audio signal as a part of the input audio signal in the temporary audio storage unit. , Claim 4
Or the audio signal recording device according to claim 5. 8. The recording audio signal generation unit according to claim 1, wherein the recording audio signal generation unit has a high efficiency encoding unit for performing high efficiency encoding on the output audio signal. An audio signal recording device as described in the above. 9. The recording unit includes a temporary storage unit for temporarily storing the multiplexing system information, and after recording one of the recording audio signal files on the recording medium, the recording audio signal is recorded. The method according to any one of claims 1 to 5, wherein the multiplexing method information corresponding to the signal is read from the temporary storage unit, and is recorded on the recording medium as a file different from the recording audio signal. The audio signal recording device according to claim 1. 10. The recording unit according to claim 1, wherein the recording unit records the recording audio signal included in one file in a substantially continuous recording area on the recording medium.
The audio signal recording device according to any one of claims 1 to 5. 11. The audio signal recording device, further comprising a temporary recording medium for temporarily recording the recording audio signal and the multiplexing system information, wherein the recording unit includes the recording audio signal and the multiplexing system. 6. The audio according to claim 1, wherein information is temporarily recorded on the temporary recording medium, and thereafter, the information is transferred from the temporary recording medium to the recording medium and recorded as separate files. Signal recording device. 12. The audio signal recording device according to claim 11, wherein said temporary recording medium is a semiconductor memory. 13. The audio signal recording device according to claim 11, wherein said temporary recording medium is a hard disk. 14. The audio signal recording device according to claim 1, wherein the predetermined input to the switch includes the multiplexing system information. 15. The recording audio signal generation unit comprises: (a)
A digital signal processing unit for performing predetermined digital signal processing on the output audio signal from the switch;
And (b) including a synchronization signal generation unit for generating a synchronization signal in synchronization with the digital signal processing; and wherein the switch switches the output audio signal in synchronization with the synchronization signal. Claims 1 and 2
Or the audio signal recording device according to claim 3. 16. In response to either or both of the input audio signal and the output audio signal according to the predetermined input to the switch, (a) before switching the output audio signal by the switch Fade out,
4. The audio signal recording apparatus according to claim 1, further comprising: a fade section for performing a fade-in of the input audio signal after the output audio signal is switched by the switch. 17. When the output audio signal is switched according to the multiplex system information, (a) performing a fade-out process on the output audio signal before the switching,
(b) The recording audio signal generation unit includes a fade unit for performing a fade-in process on the output audio signal after the switching. Audio signal recording device. 18. The method according to claim 18, wherein: either or both of the input audio signal and the output audio signal are muted when the output audio signal is switched by the switch according to the predetermined input to the switch. And set (b)
4. The audio signal recording device according to claim 1, further comprising: a mute unit configured to release the mute after the output audio signal is switched by the switch. 19. The recording audio signal generation unit includes a mute unit for performing a mute process on an output audio signal when the output audio signal is switched according to the multiplexing scheme information. The audio signal recording device according to claim 4 or 5. 20. At least one multiplexed audio signal input unit for externally inputting at least one multiplexed audio signal; determining a multiplexing method of the multiplexed audio signal input to the multiplexed audio signal input unit, and determining the multiplexing method A multiplexing scheme discriminating section for outputting a result as multiplexing scheme information; for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the multiplexed audio signal input section and outputting the extracted signals as a plurality of extracted audio signals An audio signal extraction unit for inputting an input audio signal including the extracted audio signal, outputting at least one of the input audio signals as an output audio signal, and switching the output audio signal according to a predetermined input A switch for determining an encoding format according to the multiplexing scheme information from the multiplexing scheme determining unit, An encoding processing unit for performing efficiency encoding in the encoding format and outputting a processed audio signal as a recording audio signal; and a recording medium in which the recording audio signal and the multiplexing scheme information are separately stored as files. An audio signal recording device, comprising: 21. at least one multiplex audio signal input unit for externally inputting at least one multiplex audio signal; a multiplex system information input unit for externally inputting multiplex system information of the multiplex audio signal; An audio signal extraction unit for separating and extracting a plurality of audio signals from the multiplexed audio signal input to the audio signal input unit and outputting the extracted audio signals as a plurality of extracted audio signals; inputting an input audio signal including the extracted audio signal; A switch for outputting at least one of the input audio signals as an output audio signal and switching the output audio signal in accordance with a predetermined input; encoding in accordance with the multiplexing scheme information from the multiplexing scheme determining unit A format is determined, high-efficiency encoding is performed on the output audio signal from the switch in the encoding format, and the processed audio signal is processed. An audio signal recording unit comprising: an encoding processing unit for outputting a voice signal as a recording audio signal; and a recording unit for recording the recording audio signal and the multiplexing system information as separate files on a recording medium. apparatus. 22. A recording audio signal file containing a recording audio signal corresponding to a multiplexed audio signal, and a multiplexing scheme information file containing multiplexing scheme information of the multiplexed audio signal, respectively. A reading unit for reading the recording audio signal file and the multiplex format information file from a recording medium; and a reproducing unit for reproducing an audio signal based on the recording audio signal and the multiplex format information. Signal reproducing apparatus having the same. 23. The reproducing section, comprising: (a) a recording audio signal reproducing section for reproducing the recording audio signal from the recording audio signal file; and (b) the multiplexing scheme from the multiplexing scheme information file. A multiplexing method information reproducing unit for reproducing information, including: reproducing an audio signal from a specific portion of the recording audio signal according to the multiplexing method information;
23. The audio signal reproducing device according to claim 22, wherein: 24. A recording audio signal file including a recording audio signal corresponding to a multiplexed audio signal and a multiplexing scheme information file including multiplexing scheme information of the multiplexed audio signal, respectively. A recording medium recorded in the recording area. 25. The recording medium according to claim 24, wherein said recording audio signal file is recorded on a substantially continuous recording area. 26. The recording medium according to claim 24, wherein the recording medium is detachable from any of a device for recording and a device for reading out the recording audio signal file and the multiplex format information file. 27. The recording medium according to claim 24, which is a DVD-R.