JPH04285767A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a mode which is out of definition by converting an indiscriminatable mode into a prescribed sound mode with an audio mode conversion circuit when the indiscriminatable mode is generated in decoding a regional audio mode discriminating signal by rewriting one part of plural audio recording regions. CONSTITUTION:In the case of four-channel postrecording, four-channel audio signals are impressed upon input terminals 1-4, and if their contents are two stereo systems, a four-channel audio mode discriminating signal is impressed upon an input terminal 5. The two-channel audio mode discriminating signals are impressed upon recording signal processing circuits 10 and 11 of audio recording regions 1 and 2 respectively by an audio mode discriminating signal conversion circuit 7. The audio signals of channels 1 and 2 and the two-channel audio mode discriminating signal 8 are converted into a recording signal of the audio recording region 1 by the circuit 10, while the audio signals of channels 3 and 4 and the two-channel audio mode discriminating signal 9 into a recording signal of the audio recording region 2 by the circuit 11, and then they are recorded in the regions 1 and 2 respectively. Consequently, no indefined mode is generated under reproducing, because of rewrite for all channels.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus for recording and reproducing audio signals, which records and reproduces identification signals for identifying modes of audio signals of a plurality of channels and a group of audio signals.

0002

2. Description of the Related Art A high-definition MUSE signal can transmit a video signal and a four-channel audio signal. therefore,
Since there are various audio modes depending on the content of the 4-channel audio signal, the Telecommunications Technology Council has established control signals to identify these modes.
25 types of audio modes shown in (Table 1) are defined.

0003

[Table 1]

A method for recording and reproducing these four-channel audio signals and control signals is disclosed in Japanese Patent Application No. 2-258024 filed by the inventor of the present invention.

[0005]

[Problem to be solved by the invention] In the above conventional example,
4-channel audio signal of video/audio signal recording/playback device and 4
The following recording method is available as a method for recording and reproducing a channel audio mode identification signal on a recording medium. That is, a 4-channel audio signal is distributed and recorded in a plurality of audio recording areas for each channel or 2 channels, and an area audio mode identification signal corresponding to the audio mode within that recording area is recorded in each recording area. However, at the time of reproduction, the 4-channel audio mode identification signal is decoded from each area audio mode identification signal, and the audio signal group is reproduced.

[0006] This recording and reproducing method makes it easy to perform after-recording (hereinafter referred to as post-recording) in units of 2 channels or 1 channel, in which the recording area of the audio signal and the audio mode identification signal occupies a relatively small proportion on the recording medium. , a certain recording area is rewritten due to dubbing and 4
Even if the channel audio mode changes, the 4-channel audio mode identification signal can be changed without rewriting other recording areas.

However, in this recording and 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) is 4 in the conventional example.
This shows an example of changing the audio mode when dubbing the audio signal of the channel in units of 2 channels.
In case 6, an undefined audio mode occurs and the 2-channel audio identification signal (area audio mode identification signal) cannot be decoded.

[0008]

[Table 2]

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

0010

[Means for Solving the Problems] In order to solve this problem, the present invention includes recording and reproducing means for recording and reproducing audio signals of a plurality of channels and an audio mode identification signal corresponding to the mode of the audio signal group. , the recording and reproducing means distributes and records the audio signals of the plurality of channels to a plurality of rewritable audio recording areas on the recording medium, and in each of the audio recording areas, corresponds to the audio mode within the recording area. A recording and reproducing apparatus that records an area audio mode identification signal and decodes an audio mode identification signal corresponding to a group of audio signals to be reproduced and output from the area audio mode identification signal, and that The present invention uses a recording and reproducing apparatus characterized in that it has an audio mode conversion circuit that converts to a predetermined audio mode when an unidentifiable mode occurs during decoding of the area audio mode identification signal by rewriting.

[0011]

[Operation] With the above-described configuration, the present invention prevents the occurrence of an undefined mode when the area audio mode identification signal is rewritten, and prevents the audio from being generated even when connected to another VTR or television. This has the effect of not causing any inconvenience to the signal interface.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a tape format in the recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 to 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 an audio mode identification signal input terminal. 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 section, 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 recording area 2 reproduction signal processing circuit. Reproduction signal processing circuit, 17 and 1
8 is a region audio mode identification signal, 19 is an audio mode identification signal inverse 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. Further, in FIG. 2, 30 is a magnetic tape, 31 is a video recording area on a recording track, 32 is an audio recording area 1 on the recording track, 33 is an audio recording area 2, 34 and 35 on the recording track are edit gaps.

First, normal recording and reproduction will be explained. Mode of channel 1 audio signal to input terminal 1, channel 2 audio signal to input terminal 2, channel 3 audio signal to input terminal 3, channel 4 audio signal to input terminal 4, and 4-channel audio signal to input terminal 5. A video signal is applied to the input terminal 6 and a 4-channel audio mode identification signal representing the 4-channel audio mode identification signal. The audio mode identification signal conversion circuit 7 converts the 4-channel audio mode identification signal into 2 based on the audio mode identification signal conversion table.
For example, if the content of the 4-channel audio mode identification signal applied to the input terminal 5 is "4CH (3-1 system) stereo", the content of "stereo" and "CS" is converted into a channel audio mode identification signal. A channel audio mode identification signal is applied 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 channel 1 and channel 2 audio signals and the 2-channel audio mode identification signal 8 applied to the input terminals 1 and 2 into audio recording area 1 recording signals, and records the signals. The signal is applied to the reproducing section 13. Furthermore, 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 audio recording area 2 recording signals. , recording/reproducing section 13
to be applied. The video recording signal processing circuit 10 converts the video signal applied to the input terminal 6 into a video recording area recording signal and applies it to the recording/reproducing section 13 .

The recording tracks on the magnetic tape 30 are a video recording area 31, an audio recording area 1 (32), and an audio recording area 2.
(33) and gaps 34 and 35. During 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. . During reproduction, the recording/reproducing section 13 reproduces the signals recorded in the audio recording area 1, audio recording area 2, and video recording area, and outputs 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 outputs the 2-channel audio mode identification signal 17 to the 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 2-channel audio mode identification signal 18 to the audio mode identification signal inverse conversion circuit 19. do. The audio mode identification signal inverse conversion circuit 15 converts the audio recording area 1 to the reproduction signal processing circuit 1 based on the audio mode identification signal conversion table.
4 and audio recording area 2 playback signal processing circuit 15 into a 4-channel audio mode identification signal. CS'', a 4-channel audio mode identification signal with the content of ``4CH (3-1 system) stereo'' is output to the output terminal 24. The video reproduction signal processing circuit 16 outputs the video signal to the output terminal 25.

The recording and reproducing apparatus shown in FIG. 1 is configured to record 4-channel audio signals in two recording areas for every 2 channels, and during recording, the 4-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, the two 2-channel audio mode identification signals are converted into a 4-channel audio mode identification signal based on the conversion table shown in Table 4. However, (Table 3) and (Table 4) show part of the conversion table.

[0018]

[Table 3]

[0019]

[Table 4]

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

In the case of 4-channel dubbing, 4-channel audio signals are applied to input terminals 1 to 4, and if the content of these 4-channel audio signals is 2 stereo systems, it is called ``2 stereo systems''.
A 4-channel audio mode identification signal having the contents of is applied to the input terminal 5. The audio mode identification signal conversion circuit 7 applies two-channel audio mode identification signals of "stereo" and "stereo" to the audio recording area 1 recording signal processing circuit 10 and the audio recording area 2 recording signal processing circuit 11, respectively. Audio recording area 1 recording signal processing circuit 10 is channel 1
The audio signal of channel 2 and the 2-channel audio mode identification signal 8 are converted into the audio recording area 1 recording signal, and the audio recording area 2 recording signal processing circuit 11 converts the audio signal of channel 3 and channel 4 and the 2-channel audio mode identification signal 8. The identification signal 9 is converted into an audio recording area 2 recording signal and recorded in the audio recording area 1 and audio recording area 2, respectively. During reproduction, four-channel audio signals are output from the output terminals 20 to 23, and a four-channel audio mode identification signal with 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, an undefined mode will not occur.

In the case of 2-channel dubbing, when 2-channel audio signals are applied to input terminals 3 and 4, if the content of the 2-channel audio signals is stereo, the 2-channel audio mode identification signal with the content of "stereo" is set as 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 audio recording area 2 recording signals,
Record in audio recording area 2. At this time, the contents recorded in the audio recording area 1 remain unchanged. Therefore, the 2-channel audio mode identification signal 8 recorded in the audio recording area 1 is "stereo", and the 2-channel audio mode identification signal 9 recorded in the audio recording area 2 is "stereo".
becomes. During playback, 4-channel audio signals are output from output terminals 20 to 23, and the content of the 2-channel audio mode identification signal is "stereo"/"stereo", so the 4-channel audio mode with the content of "stereo 2 systems" is selected. An identification signal is output from the output terminal 24.

Similarly, in the case of 2-channel dubbing, if 2-channel audio signals are applied to input terminals 1 and 2, and the content of these 2-channel audio signals is 2 monaural systems, 2-channel audio with 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 channel 1 and channel 2 audio signals and the 2-channel audio mode identification signal 8 into an audio recording area 1 recording signal, and records the signal in the audio recording area 1. At this time,
The contents recorded in the audio recording area 2 remain unchanged. Therefore, the 2-channel audio mode identification signal recorded in audio recording area 1 is "monaural 2", and the 2-channel audio mode identification signal recorded in audio recording area 2 is "CS". During playback, 4-channel audio signals are output from output terminals 20 to 23, and since the contents of the 2-channel audio mode identification signal are "monaural 2" and "CS", the audio mode is not defined in Table 1. . In this case, the audio mode identification signal inverse conversion circuit 24 outputs from the output terminal 24 a 4-channel audio mode identification signal with the content of "4 monaural channels" based on (Table 4).

[0024] The above embodiment shows a recording/reproducing apparatus that records two channels of audio and a two-channel audio mode identification signal in the same audio recording area. This is a circuit that converts a channel audio mode identification signal into a 1-channel audio mode identification signal, and the 1-channel audio mode identification signal is, for example, "R", "
It is also possible to consider a recording and reproducing apparatus that records one channel of audio and one channel audio mode identification signal in the same audio recording area. In this case, you can perform dubbing for each channel of the audio signal.
Even in this case, when an audio mode not defined in Table 1 is generated during post-recording, it is always converted into a 4-channel audio mode identification signal defined by the conversion table of the audio mode identification signal inverse conversion circuit.

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

In addition, among the n-channel audio signals, m
When recording and reproducing only the audio signal of channel (n>m), or when recording all n channels but reproducing only m channel (n<m), obtain the audio mode identification signal of n channel. It is more practical to obtain m-channel audio mode identification signals. For this purpose, it is assumed that an audio mode identification signal is input and an m channel audio mode identification signal indicating the mode of m reproduced audio signal groups is output.

[0027] To give concrete numerical values, 8 channels (
In a recording and reproducing device that can record all audio signals of n=8), even when selectively reproducing 4 channels (m=4) during playback, each area audio mode identification signal is decoded and a 4 channel audio mode signal is generated. It is convenient to output . Even in this case, when an undefined audio mode is generated during post-recording, it is always converted into an m-channel audio mode identification signal defined by the conversion table of the audio mode identification signal inverse conversion circuit.

[0028] In the future, the definition of voice mode will be (Table 1)
) may be expanded from ), but in that case, it can be handled by rewriting the conversion tables in (Table 3) and (Table 4).

[0029]

As described above, by implementing the present invention, it is possible to input and output n-channel audio and n-channel audio mode identification signals, and in dubbing, the minimum unit of the audio recording area on the recording track is Even if dubbing is performed in any combination for each dubbing, 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 dubbing, and as a result of dubbing, unreasonable audio modes can be created. Even if this occurs, a conversion table in the internal circuitry allows the most suitable predefined audio mode to be assigned to that mode.

[Brief explanation of the drawing]

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

FIG. 2 is a schematic diagram of a tape format in 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 section 14 Audio Recording area 1 playback signal processing circuit 15 Audio recording area 2 playback signal processing circuit 16 Video playback signal processing circuits 17, 18 Area audio mode identification signal 19 Audio mode identification signal inverse conversion circuits 20 to 23 Output terminal 30 Magnetic tape 31 Video recording area 32 Audio recording area 1 33 Audio recording area 2 34, 35 Edit gap

Claims (2)

[Claims] 1. Recording and reproducing means for recording and reproducing a plurality of channels of audio signals and an audio mode identification signal corresponding to a mode of an audio signal group, the recording and reproducing means recording and reproducing the plurality of channels of audio signals on a recording medium. Distributing and recording into a plurality of rewritable audio recording areas, recording an area audio mode identification signal corresponding to the audio mode in the recording area in each of the audio recording areas, and recording the audio signal group to be reproduced and output. A recording/reproducing device that decodes the area audio mode identification signal and outputs a corresponding audio mode identification signal, the recording/reproducing device rewriting a part of the plurality of audio recording areas to identify the area audio mode identification signal when decoding the area audio mode identification signal. 1. A recording and reproducing device comprising an audio mode conversion circuit that converts to a predetermined audio mode when an impossible mode occurs. 2. Record n-channel audio signals (n is an integer) and reproduce m-channel audio signals (m is an integer, n>m), or record m-channel audio signals among the n-channel audio signals. 2. The recording and reproducing apparatus according to claim 1, which records and reproduces information.