JPH05242598A - Signal recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even when the ID code of each area is different, the audio signals can be selected and the unmixed audio signals can be reproduced. [Structure] The two reproduced signals by the head 2 are magnetic tape 1
More reproduced, supplied to the digital audio reproduction circuit 3, demodulated, and then output to the ID detection circuits 4 and 5. Here, the ID code is extracted and output to the comparison processing circuit 6. As a result of comparison between the ID codes in the comparison processing circuit 6, if they do not match, a plurality of audio reproduction modes are generated based on the combination of the input ID codes and output to the selection circuit 7. .. Input terminal 8 in selection circuit 7
One audio reproduction mode signal is selected and supplied to the audio reproduction circuit 9 by the mode selection designation signal introduced via the. Based on the audio reproduction mode signal supplied here, the audio data of each audio reproduction signal from the digital audio reproduction circuit 3 is distributed to the required channels, and the corresponding speakers 10 ₁ to 10 _n are selected. Then, the audio data is supplied to the selected speaker and output after D / A conversion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus having a plurality of audio channels.

[0002]

2. Description of the Related Art Conventionally, magnetic tapes, optical disks, etc. have been used as media for recording images, but magnetic tapes are generally used for reasons such as cost reasons.
A video tape recorder (hereinafter referred to as a VTR) is typical as a device for recording and reproducing using the magnetic tape. In recent years, a high-definition television system has been particularly adopted for the purpose of further improving the image quality of current television broadcasting. For example, the current NTS
Not only is there a demand for high-quality broadcasting that simply surpasses the image quality of the C method, but there is also a demand for the creation of a system that provides a powerful and realistic sensation that is comparable to stereoscopic video.

The video and audio have been reformed in order to produce a force and a sense of presence that is comparable to this three-dimensional video, and the video changes from visual information to line-of-sight information as the screen becomes larger, that is, the vertical and horizontal directions of the monitor screen. The aspect ratio is changed from the current 3 to 4 to, for example, 9 to 16, and the audio is changed from the conventional 2-channel stereo to the 3-1 system (the front side has three channels for the center and left and right channels, and the rear side has one surround channel). It has a stereophonic system called 4-channel stereo. In this way, the high-definition television system makes it possible to approach a stereoscopic image as much as possible from both video and audio. A VTR having a recording format compatible with a plurality of, for example, four audio channels is adopted as a device for recording / reproducing this.

FIG. 2 shows a VTR tape format compatible with the so-called high-definition television system, which is a Japanese high-definition television system. In FIG. 2, reference numeral 20 indicates a magnetic tape, and digital audio signal recording areas 22 and 23 and a video signal recording area 24 are provided on the magnetic tape 20. This digital audio signal recording area 22, 23
And the video signal recording area 24 form one track 21. The audio signal is recorded in this audio signal recording area 22, 2
Each area of 3 has 2 channels each in case of PCM system of 48 KHz sampling and 16 bit quantization, or PC of 32 KHz sampling and 12 bit non-linear quantization.
In the case of the M method, each 4 channels are recorded. In this tape format, since each area can be recorded independently, for example, the audio signal recording area 22 is used for music recording, and the audio signal recording area 23 is used for after recording (hereinafter referred to as dubbing). A method can be considered.

FIG. 3 shows a format of the digital audio signal recording area. In FIG. 3, reference numeral 30 represents one data format of the audio signal recording area 22 or 23 of the track 21, for example, of the plurality of tracks of the tape format shown in FIG. This includes a preamble 40, a postamble 60 for clock synchronization, and n
Data area 5 divided into +1 blocks B0 to Bn
0 and are provided. Further, the data format of the block in the data area 50, for example, the block B0, is subdivided, and includes a synchronization code 51, an address 52, an ID code 53 indicating a voice reproduction mode, and a parity 54 for detecting a bit error. It is composed of a data section 55 in which an audio signal is recorded.

FIG. 4 shows a function setting diagram of the ID code.
(Only the part relating to the voice mode is simplified and described.) ◎ In Fig. 4, the function setting of each ID code is ID000.
Indicates a 4-channel stereo system of 3-1 system, and ID
Reference numeral 001 indicates a 2-channel 4-channel stereo system.
ID010 shows two sets of two-channel stereo system, and ID011 shows two-channel stereo system with two sets of monaural signals. Further, ID100 shows a system having four channels of monaural signals, and ID101 shows a system having three channels of monaural signals. In addition, ID000 is the audio reproduction mode (A), ID001 is the audio reproduction mode (B)
Further, ID010 corresponds to the audio reproduction mode (C), ID011 corresponds to the audio reproduction mode (D), ID100 corresponds to the audio reproduction mode (E), and ID101 corresponds to the audio reproduction mode (F).

Here, the 48 KHz sampling 16
When 4-channel stereo of 3-1 system is recorded in the above format in the bit quantization system,
The ID codes of the audio signal recording areas 22 and 23 shown in are recorded as ID000, respectively. Further, the CH 1 and 2 signals shown in Table 1 are recorded in the data portion of the audio signal recording area 22, and the CH 3 and 4 signals are recorded in the data portion of the audio signal recording area 23. During reproduction, the audio signal recording areas 22, 2
ID000 is read from each of the ID codes 3 and CH1 to CH1 of the data portion of the audio signal recording areas 22 and 23 are read.
By reading out the signal of 4, the 4 of 3-1 system
The channel stereo is played.

However, since the tape format has two audio recording areas in one track, for example, the track 21 shown in FIG. 2 is recorded by the 2-2 system 4-channel stereo (ID001). Then, if it is assumed that after-recording (ID100) of two monaural channels is recorded for the rear channels of the same track 21,
The ID code recorded in this case is the voice recording area 2
2 has ID001, and voice recording area 23 has ID100.
Becomes In the audio recording area 22, the respective data parts of the audio recording areas 22 and 23 are Lf (front side left channel signal) and Rf (front side right channel signal) shown in Table 1, and in the audio recording area 23, These are M3 (the third monaural signal on the rear channel) and M4 (the fourth monaural signal on the rear channel).

Therefore, when the track 21 is reproduced, 2 is recorded according to the ID bit 001 of the audio recording area 22.
-2 system 4 channel stereo sound is reproduced and the front 2 channel stereo sound (Lf, Rf) is rear 2 channel post-recorded monaural sound (M3, M4)
There was a drawback that they would be mixed and regenerated.

That is, in the conventional signal recording / reproducing apparatus, when the ID code of each area shows a different audio reproduction mode, only one ID code is used as a correct value, and the audio reproduction mode is determined by the ID code. As a result, the two areas are mixed and reproduced at the same time, which causes a problem that independent reproduction cannot be performed before and after the four channels of the audio signal.

[0011]

In the conventional signal recording / reproducing apparatus as described above, when the ID code of each area indicates a different audio reproduction mode, only one ID code is determined as a correct value. Since the audio reproduction mode signal determined by the ID code is reproduced, there is a problem that independent reproduction cannot be performed before and after four channels of the audio signal. Therefore, in order to solve the above problems, it is an object of the present invention to provide a signal recording / reproducing apparatus capable of selecting and determining the audio reproduction mode without any inconvenience even when the ID code is different in each area. There is.

[0012]

A signal recording / reproducing apparatus according to the present invention includes a recording means for recording a plurality of audio signals having a plurality of attribute data, a reproducing means for reproducing the plurality of audio signals, and the reproducing means. Comparing the respective attribute data from the extracting means for extracting the respective attribute data from the audio signal from the voice signal and comparing the respective attribute data from the extracted attribute data with each other when the results do not match. Means, selection means for selecting desired reproduction mode data from the plurality of reproduction mode data from the comparison means, and audio signals from the reproduction means are distributed to channels according to the reproduction mode data selected from the selection means. And a means for outputting to a speaker corresponding to the channel.

[0013]

In the present invention, the ID codes in the two audio signal recording areas are extracted from the reproduced audio signal to be reproduced and compared, so that if the ID codes are different from each other, the set of the ID codes is different. Independent reproduction is possible by generating a sound reproduction mode according to the combination and further selecting and determining it.

[0014]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a signal recording / reproducing apparatus according to the present invention. In FIG. 1, reference numeral 1 is a magnetic tape, and the respective audio signals of the two recorded audio signal recording areas are reproduced by the head 2 and supplied to the digital audio reproducing circuit 3. In the digital audio reproduction circuit 3, the modulated code is restored to the original digital audio signal and supplied to the ID detection circuits 4 and 5 and the audio reproduction circuit 9. The ID code is extracted from each audio signal by the ID detection circuits 4 and 5, and is supplied to the comparison processing circuit 6. From the two ID codes supplied to the comparison processing circuit 6, one or a plurality of audio reproduction mode signals are generated and output to the selection circuit 7. In the selection circuit 7, when the input audio reproduction mode signal is a single signal, it is output to the audio reproduction circuit 9 as it is, and when it is plural, one is selected by the mode selection designation signal introduced through the input terminal 8. The audio reproduction mode is selected and output to the audio reproduction circuit 9. In the audio reproduction circuit 9, the audio data of each audio reproduction signal from the digital audio reproduction circuit 3 is distributed to necessary channels based on the supplied audio reproduction mode signal, and after being converted from digital to analog,
A plurality of speakers 10 ₁ to 10 _n corresponding to the channel are selected and driven.

The comparison processing circuit 6 compares the two input ID codes and, if the ID codes match with each other, outputs a voice reproduction mode signal corresponding to the ID code, resulting in a mismatch. In this case, based on the combination of the two input ID codes, a plurality of audio reproduction mode signals corresponding to the combination are generated and output.

The operation of the present embodiment thus configured will be described. First, it is assumed that the 2-2 system 4-channel stereo (ID001) is recorded on the track 21 shown in FIG. 2, and then the monaural 4-channel post-recording (ID100) is recorded on the same track 21.

A reproduction signal of the audio signal recording area 22 (where ID001 is recorded) recorded on the magnetic tape 1 and a reproduction signal of the audio signal recording area 23 (where ID100 is recorded) pass through the head 2. It is supplied to the digital audio reproducing circuit 3 via the. In the digital audio reproduction circuit 3, the modulated code is demodulated to the original digital reproduction signal, the reproduction signal of the audio signal recording area 22 is supplied to the ID detection circuit 4, and the reproduction signal of the audio signal recording area 23 is It is supplied to the ID detection circuit 5. Further, the respective reproduction signals of the audio signal recording areas 22 and 23 are supplied to the audio reproduction circuit 9. ID from the reproduction signal supplied to the ID detection circuit 4
The code 001 is extracted, and the ID code 100 is extracted from the reproduction signal supplied to the ID detection circuit 5.

The ID codes 001 and 100 extracted by the ID detection circuits 4 and 5 are supplied to the comparison processing circuit 6 so that the I and
The D code 001,100 is compared. When the ID codes do not match here, the input ID code 00
Based on the combination of 1,100, the front side 2-channel stereo audio playback mode (B), the post-recording rear mono 2 channel audio playback mode (E), and the 2-channel stereo and post-recording mono 2 channel audio The audio reproduction mode (B + E) of the mix is generated and output to the selection circuit 7.

In the selection circuit 7, a mode selection designation signal according to the user's request is supplied through the input terminal 8 so that one of the three audio reproduction mode signals from the comparison processing circuit 14 is selected and supplied to the audio reproduction circuit 9. To be done. Based on the audio reproduction mode signal supplied in the voice reproduction circuit 9, audio data of each of the audio reproduction signal from the digital audio reproduction circuit 3 is respectively allocated to channels required, further speakers 10 ₁ corresponding to the channel
A plurality of 10 _n are selected. Then, the audio data is converted from digital to analog and then supplied to the selected speaker and output.

As described above, in this embodiment, the ID codes in the two reproduced audio signal recording areas are extracted,
When the ID codes differ from each other by further comparison, one or more audio reproduction modes are generated according to the combination of the ID codes, and one audio reproduction mode is further generated according to the mode selection designation signal from the user. The audio reproduction mode can be selected and determined, and an audio channel signal corresponding to it can be output.

In this embodiment, two ID detecting circuits are provided, but it is also possible to share one ID detecting circuit in a time division manner.

[0022]

As described above, according to the present invention, even if the ID code of each area indicates a different audio reproduction mode, the audio reproduction mode can be selected and determined without any inconvenience, so that the audio information can be reproduced before and after the four channels of audio information. It is possible to suppress the confusion of.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a signal recording / reproducing apparatus according to the present invention.

[Figure 2] VTR tape format diagram compatible with the high-definition system

3 is a data format diagram of a digital audio signal recording area in FIG.

FIG. 4 is a function setting diagram of the ID code in FIG.

[Explanation of symbols]

 3 ... Digital audio reproduction circuit 4, 5 ... ID detection circuit 6 ... Comparison processing circuit 7 ... Selection circuit 8 ... Mode selection designation signal input terminal 9 ... Audio reproduction circuit

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Claims (1)

[Claims] 1. A recording unit for recording a plurality of audio signals having a plurality of attribute data, a reproducing unit for reproducing the plurality of audio signals, and each attribute data extracted from the audio signals from the reproducing unit. Extracting means, comparing means for comparing the respective attribute data from the extracting means and generating reproduction mode data from the extracted respective attribute data when the results do not match, and a plurality of reproducing mode data from the comparing means Selection means for selecting a desired reproduction mode data from the selection means, and means for distributing the audio signal from the reproduction means to a channel in accordance with the reproduction mode data selected from the selection means and outputting it to a speaker corresponding to the channel. A signal recording / reproducing apparatus characterized in that