JP2589888B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal recording / reproducing apparatus for recording and reproducing an audio signal of a plurality of channels and an identification signal for identifying a mode of an audio signal group.

[0002]

2. Description of the Related Art Hi-vision MUSE signals can transmit video signals and four-channel audio signals. Therefore,
Since there are various audio modes depending on the content of the audio signal of the four channels, a control signal for identifying these modes is determined by the Telecommunication Technology Council,
25 types of audio modes shown in (Table 1) are defined.

[0003]

[Table 1]

As a method of recording and reproducing the 4-channel audio signal and the control signal, there is Japanese Patent Application No. 2-258024 filed by the present inventor.

[0005]

In the above conventional example,
4 channel audio signal and 4 channel of video / audio signal recording / reproducing device
There is the following recording method as a method of recording and reproducing the channel audio mode identification signal on the recording medium. That is, the four-channel audio signal is distributed to a plurality of audio recording areas for every one or two channels and recorded, and an area audio mode identification signal corresponding to the audio mode in the recording area is recorded in each recording area. At the time of reproduction, the four-channel audio mode identification signal is decoded from each area audio mode identification signal, and an audio signal group is reproduced.

According to this recording / reproducing method, after-recording (hereinafter, referred to as after-recording) in units of two channels or one channel, in which a recording area of an audio signal and an audio mode identification signal occupies a relatively small area on a recording medium, is easy. A certain recording area is rewritten by post-recording,
Even if the channel audio mode changes, there is an advantage that the 4-channel audio mode identification signal can be changed without rewriting the other recording area again.

However, in this recording / reproducing method, when a certain recording area is dubbed, an audio mode not defined in (Table 1) may occur depending on the mode of the rewritten audio signal. (Table 2) shows 4 in the conventional example.
8 shows an example of changing the audio mode when the audio signal of the channel is dubbed in units of two channels.
In the case of 6, an undefined audio mode is generated, and decoding of the two-channel audio identification signal (area audio mode identification signal) becomes impossible.

[0008]

[Table 2]

Therefore, the conventional recording method has a problem that the audio mode identification signal cannot be decoded from the area audio mode identification signal in some cases.

[0010]

In order to solve this problem, the present invention comprises recording / reproducing means for recording and reproducing an audio signal of a plurality of channels and an audio mode identification signal corresponding to the mode of the audio signal group. The recording / reproducing means distributes and records the audio signals of a plurality of channels to a plurality of rewritable audio recording areas on a recording medium, and each of the audio recording areas corresponds to an audio mode in the recording area. A recording / reproducing apparatus that records an area audio mode identification signal and decodes an audio mode identification signal corresponding to an audio signal group to be reproduced and output from the area audio mode identification signal, and further includes a part of the plurality of audio recording areas. When an indistinguishable mode occurs during decoding of the area audio mode identification signal by rewriting, the audio to be converted to a predetermined audio mode It is to use a recording and reproducing apparatus characterized by having over de conversion circuit.

[0011]

According to the present invention, an undefined mode is prevented from occurring when the area audio mode identification signal is rewritten by the above-described configuration, and the audio signal is output even when connected to another VTR or television. There is an effect that no inconvenience occurs in the signal interface.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a recording and reproducing apparatus according to one embodiment of the present invention, and FIG. 2 is a schematic diagram of a tape format in the recording and reproducing apparatus according to one embodiment of the present invention.
In FIG. 1, 1-4 are audio signal input terminals, 5 is an audio mode identification signal input terminal, 6 is a video signal input terminal, 7 is an audio mode identification signal conversion circuit, 8 and 9 are area audio mode identification signals, and 10 is Audio recording area 1 recording signal processing circuit,
11 is an audio recording area 2 recording signal processing circuit, 12 is a video recording signal processing circuit, 13 is a recording / reproducing unit, 14 is an audio recording area 1 reproduction signal processing circuit, 15 is an audio recording area 2 reproduction signal processing circuit, and 16 is a video. Reproduction signal processing circuit, 17 and 1
8 is an area audio mode identification signal, 19 is an audio mode identification signal reverse conversion circuit, 20 to 23 are audio signal output terminals, 24 is an audio mode identification signal output terminal, and 25 is a video signal output terminal. In FIG. 2, reference numeral 30 denotes a magnetic tape, 31 denotes a video recording area on a recording track, 32 denotes an audio recording area 1 on a recording track, 33 denotes an audio recording area 2, 34 and 35 on a recording track, and edit gaps.

First, normal recording and reproduction will be described. Input terminal 1 has an audio signal of channel 1, input terminal 2 has an audio signal of channel 2, input terminal 3 has an audio signal of channel 3, input terminal 4 has an audio signal of channel 4, and input terminal 5
The video signal is applied to the input terminal 6 and a four-channel audio mode identification signal representing the mode of the four-channel audio signal. The audio mode identification signal conversion circuit 7 converts the four-channel audio mode identification signal into a two-channel audio mode identification signal based on the audio mode identification signal conversion table, and converts the four-channel audio mode identification signal applied to the input terminal 5. For example, if the content is “4CH (3-1 system) stereo”, the two-channel audio mode identification signal having the contents of “stereo” and “CS” is recorded in the audio recording area 1 recording signal processing circuit 10 and the audio recording area 2 recording signal processing circuit 11 Respectively. The audio recording area 1 recording signal processing circuit 10 has an input terminal 1
And channel 2 applied to input terminal 2
And the two-channel audio mode identification signal 8 are converted to the audio recording area 1 recording signal and applied to the recording / reproducing unit 13. The audio recording area 2 recording signal processing circuit 11 converts the audio signals of channels 3 and 4 and the 2-channel audio mode identification signal 9 applied to the input terminals 3 and 4 into the audio recording area 2 recording signal. , Recording and reproducing unit 1
3 The video recording signal processing circuit 10 has an input terminal 6
Is converted into a video recording area recording signal and applied to the recording / reproducing unit 13.

The recording tracks on the magnetic tape 30 are a video recording area 31, an audio recording area 1 (32), an audio recording area 2
(33) and gaps 34 and 35. At the time of recording, the recording / reproducing unit 13 records the audio recording area 1 recording signal in the audio recording area 1, the audio recording area 2 recording signal in the audio recording area 2, and the video recording area recording signal in the video recording area. . At the time of reproduction, the recording / reproducing unit 13 reproduces signals recorded in the audio recording area 1, the audio recording area 2, and the video recording area, and the audio recording area 1 reproduction signal processing circuit 14 and the audio recording area 2 reproduction signal processing circuit, respectively. 15 and the video reproduction signal processing circuit 16.

The audio recording area 1 reproduction signal processing circuit 14 outputs the audio signal of channel 1 and the audio signal of channel 2 to output terminals 20 and 21, respectively, and converts the two-channel audio mode identification signal 17 into an audio mode identification signal inverse conversion circuit. 19. The audio recording area 2 reproduction signal processing circuit 15 outputs the audio signal of channel 3 and the audio signal of channel 4 to output terminals 22 and 23, respectively, and applies the two-channel audio mode identification signal 18 to the audio mode identification signal inverse conversion circuit 19. I do.
The audio mode identification signal reverse conversion circuit 15 is configured to output the audio recording area 1 reproduced signal processing circuit 1 based on the audio mode identification signal conversion table.
4 and the audio recording area 2 The 2 channel audio mode identification signal applied from the reproduction signal processing circuit 15 is converted into a 4 channel audio mode identification signal. If it is “CS”, a 4-channel audio mode identification signal having the content of “4CH (3-1 system) stereo” is output to the output terminal 24. The video reproduction signal processing circuit 16 outputs a video signal to the output terminal 25.

The recording / reproducing apparatus shown in FIG. 1 records audio signals of four channels in two recording areas every two channels. At the time of recording, the four-channel audio mode identification signal is as shown in Table 3. It is converted into two 2-channel audio mode identification signals (area audio mode identification signals) based on the conversion table. Conversely, during playback, two
The channel audio mode identification signal is converted into a 4-channel audio mode identification signal based on the conversion table in (Table 4). However, (Table 3) and (Table 4) show a part of the conversion table.

[0018]

[Table 3]

[0019]

[Table 4]

When dubbing audio onto a magnetic tape recorded as described above, the recording / reproducing apparatus performs the following operation. However, in the following embodiments, it is assumed that the audio mode of "4CH (3-1 system) stereo" is recorded before dubbing is performed.

In the case of four-channel audio dubbing, a four-channel audio signal is applied to input terminals 1 to 4. If the content of the four-channel audio signal is two stereo, "two stereo"
Is applied to the input terminal 5. The audio mode identification signal conversion circuit 7 applies the “stereo” and two-channel audio mode identification signals having the contents of “stereo” to the audio recording area 1 recording signal processing circuit 10 and the audio recording area 2 recording signal processing circuit 11, respectively. The audio recording area 1 recording signal processing circuit 10 converts the audio signals of channel 1 and channel 2 and the 2-channel audio mode identification signal 8 into an audio recording area 1 recording signal.
The audio recording area 2 recording signal processing circuit 11 converts the audio signals of channels 3 and 4 and the 2-channel audio mode identification signal 9 into an audio recording area 2 recording signal, and records them in the audio recording area 1 and the audio recording area 2 respectively. . In reproduction, a four-channel audio signal is output from the output terminals 20 to 23, and a four-channel audio mode identification signal having the content of “two stereo systems” is output from the output terminal 24. In this case, since all channels are rewritten, if only a predetermined audio mode is handled, the undefined mode does not occur.

In the case of two-channel audio dubbing, when a two-channel audio signal is applied to the input terminals 3 and 4, if the content of the two-channel audio signal is stereo, a two-channel audio mode identification signal of "stereo" is transmitted to the audio mode. The signal is applied from the identification signal conversion circuit 7 to the audio recording area 2 recording signal processing circuit 11. The audio recording area 2 recording signal processing circuit 11 converts the audio signals of channels 3 and 4 and the 2-channel audio mode identification signal 9 into an audio recording area 2 recording signal,
It is recorded in the audio recording area 2. At this time, the contents recorded in the audio recording area 1 remain unchanged. Therefore, the two-channel audio mode identification signal 8 recorded in the audio recording area 1 is “stereo”, and the two-channel audio mode identification signal 9 recorded in the audio recording area 2 is “stereo”.
Becomes In reproduction, a 4-channel audio signal is output from the output terminals 20 to 23, and the content of the 2-channel audio mode identification signal is "stereo" / "stereo". The identification signal is output from the output terminal 24.

Similarly, in the case of two-channel audio dubbing, when two-channel audio signals are applied to the input terminals 1 and 2, if the contents of the two-channel audio signals are two monaural systems, two-channel audio having the content of "monaural 2" The mode identification signal is applied from the audio mode identification signal conversion circuit 7 to the audio recording area 1 recording signal processing circuit 10. The audio recording area 1 recording signal processing circuit 10 converts the audio signals of channel 1 and channel 2 and the 2-channel audio mode identification signal 8 into an audio recording area 1 recording signal, and records it in the audio recording area 1. At this time,
The contents recorded in the audio recording area 2 remain unchanged. Therefore, the two-channel audio mode identification signal recorded in the audio recording area 1 is “monaural 2”, and the two-channel audio mode identification signal recorded in the audio recording area 2 is “CS”. In reproduction, four-channel audio signals are output from the output terminals 20 to 23, and the contents of the two-channel audio mode identification signal are "monaural 2" and "CS".
Therefore, the audio mode is not defined in Table 1.
In this case, in the audio mode identification signal inverse conversion circuit 24, based on (Table 4), the content of "monaural four systems"
The channel audio mode identification signal is output from the output terminal 24.

The above embodiment shows the recording / reproducing apparatus for recording the two-channel audio mode and the two-channel audio mode identification signal in the same audio recording area. A circuit for converting the channel audio mode identification signal into a one-channel audio mode identification signal.
"L", "C", "S", "monaural", audio 1
A recording / reproducing apparatus that records a channel and a one-channel audio mode identification signal in the same audio recording area is also conceivable. In this case, after-recording can be performed for each channel of the audio signal. In this case, when an audio mode not defined in (Table 1) occurs due to the after-recording, it is always defined by the conversion table of the audio mode identification signal reverse conversion circuit. 4
It is converted to a channel audio mode identification signal.

In another embodiment, an n-channel audio signal is divided into k sets of audio signals, and an audio mode identification signal conversion circuit converts the n-channel audio mode identification signals into k sets of audio mode identification signals. A recording / reproducing apparatus which records the audio signals of each of the k sets and the mode identification signal of each set of the audio signals in the same recording area separated by an edit gap on a recording medium is conceivable. Also in this case, when a voice mode not defined in Table 1 occurs by dubbing a part of the audio signal divided into k groups, the voice mode is always defined by the conversion table of the voice mode identification signal inversion circuit. It is converted into an n-channel audio mode identification signal.

In addition, m of the n-channel audio signals
When only the audio signal of channel (n> m) is recorded and reproduced, or when all n channels are recorded and only m channel (n <m) is reproduced, an audio mode identification signal of n channel is obtained. It is more practical to obtain the m-channel audio mode identification signal than to obtain the m-channel audio mode identification signal. For this purpose, an audio mode identification signal is input and an m-channel audio mode identification signal indicating the mode of the m reproduced audio signal groups is output.

More specifically, in a recording / reproducing apparatus capable of recording all audio signals of eight channels (n = 8), even when selectively reproducing four channels (m = 4) during reproduction, It is convenient to decode the area audio mode identification signal and output a 4-channel audio mode signal. Also in this case, when an undefined audio mode is generated by the after-recording operation, the audio mode is converted into an m-channel audio mode identification signal always defined by a conversion table of the audio mode identification signal inversion circuit.

In the future, the definition of the voice mode may be expanded from (Table 1). In this case, it is possible to cope by rewriting the conversion tables of (Table 3) and (Table 4). .

[0029]

As described above, by practicing the present invention, it is possible to input and output n-channel audio and an n-channel audio mode identification signal. Even if the dubbing of any combination is performed every time, the reproduced n-channel audio mode identification signal can be changed to the identification signal of the mode of the n-channel audio signal after the audio dubbing. Even if it occurs, it is possible to assign a predefined voice mode that is most suitable for that mode by using a conversion table of the internal circuit.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram of a tape format according to an embodiment of the present invention.

[Explanation of symbols]

 1 to 6 input terminal 7 audio mode identification signal conversion circuit 8, 9 area audio mode identification signal 10 audio recording area 1 recording signal processing circuit 11 audio recording area 2 recording signal processing circuit 12 video recording signal processing circuit 13 recording / reproducing unit 14 audio Recording area 1 playback signal processing circuit 15 Audio recording area 2 playback signal processing circuit 16 Video playback signal processing circuit 17, 18 Area audio mode identification signal 19 Audio mode identification signal inverse conversion circuit 20-23 Output terminal 30 Magnetic tape 31 Video recording area 32 Voice recording area 1 33 Voice recording area 2 34, 35 Edit gap

Claims (2)

(57) [Claims] 1. A recording / reproducing means for recording and reproducing an audio signal of a plurality of channels and an audio mode identification signal corresponding to a mode of an audio signal group, wherein the recording / reproducing means records the audio signals of the plurality of channels on a recording medium. While distributing and recording in a plurality of rewritable audio recording areas, an area audio mode identification signal corresponding to an audio mode in the recording area is recorded in each of the audio recording areas, and the audio signal group to be reproduced and output is recorded. What is claimed is: 1. A recording / reproducing apparatus which decodes a corresponding audio mode identification signal by decoding said area audio mode identification signal and outputs said audio mode identification signal when decoding said area audio mode identification signal by rewriting a part of said plurality of audio recording areas. A recording mode, comprising an audio mode conversion circuit for converting to a predetermined audio mode when an impossible mode occurs; Raw equipment. 2. An n-channel (n is an integer) audio signal is recorded and an m-channel (m is an integer, n> m) audio signal is reproduced, or an m-channel audio signal among the n-channel audio signals is reproduced. The recording / reproducing apparatus according to claim 1, which performs recording / reproducing.