JPH04298862A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically attain a desired reproducing state, to easily attain a background music mode, a naration mode, etc., using post-recording and to very easily attain an optimum reproducing state corresponding to the purpose of the post-recording at the time of performance of the post-recording. CONSTITUTION:A expansion control signal SCE formed with a type code and a selecting code of sound is recorded on the sub-code data area AR1 (sub-code data DSB1) of a magnetic tape 16. In this manner, the desired reproducing state is set. At the time of reproducing, sound signals are automatically reproducing based on the above-mentioned type code and the selecting code. The sound is outputted from the speaker 28 designated by the selecting code. At this time, the state mixing the sounds by mixing the sound signals of different channels in desired mixing ratio is automatically reproduced, as well.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to recording/reproducing devices, particularly HDTVs (High Definition TVs),
For example, it relates to a recording/playback device suitable for high-definition.

0002

[Prior Art] Current television broadcasting (UHF, VH
In F), there are the following audio modes. (1) Monaural (2) Stereo (3) Audio multiplexing (a) Main audio (b) Sub audio (c) Main audio + sub audio

[0003] In the conventional television receiver, the above-mentioned audio modes are automatically switched based on a code added to the audio signal. however,
In the case of [(3) Audio multiplexing], the above (a) to (c)
The user himself/herself can manually select one of them, and if no selection operation is performed, it is preset that [(a) main audio] will be selected.

[0004] In a VTR, an audio signal is recorded together with a video signal in a format corresponding to each audio mode. for example,〔
(2) Stereo], the L side audio signal and the R side audio signal are recorded on different tracks. Also,〔
(3) Audio multiplexing], the main audio signal and the sub audio signal are recorded on different tracks.

[0005]

[Problem to be Solved by the Invention] Even if the user selects and records the sub-audio in the expectation that the sub-audio will be output when the VTR plays back, the VTR does not record the main audio signal and the sub-audio signal. In addition, since VTRs cannot automatically distinguish between the main audio signal and the sub audio signal, there is a problem in that during playback, it is unclear which of the main audio signal and the sub audio signal is to be reproduced. In such a case, there is a problem in that the selection of the sub-audio requires manual operation by the user.

[0006] Such problems are expected to increase more and more in the future. For example, in satellite broadcasting (including high-definition broadcasting that is scheduled to begin broadcasting), there are 29 types of audio modes, and each audio mode is broadcast on four channels, with the exception of some.

[0007] For broadcasting in an audio mode with two or more systems or an audio mode with independent supplementary audio (independent audio not related to video), the above-mentioned [(3)
) Audio multiplexing], there was a problem in that the user had to manually select the desired audio signal during playback.

[0008] Even when it is desired to reproduce two or more types of audio at an appropriate mixing ratio, there is a problem in that the mixing ratio must be manually set by the user during playback.

Furthermore, by after-recording,
Although it becomes possible to realize even more functions, the above-mentioned conventional technology has a problem in that it cannot cope with this.

[0010] Accordingly, an object of the present invention is to provide a recording/reproducing apparatus that can automatically reproduce audio according to a designated reproduction mode without manual operation by the user.

[0011]

[Means for Solving the Problems] In the present invention, in a recording/playback device that records and plays back a control code and a plurality of channels of audio data, the control code specifies at least the playback state of the sound during playback. The configuration is such that the code to be used is recorded.

0012

[Operation] In the recording/reproducing apparatus according to the present invention, at the time of recording, an area for recording a control code is set in a predetermined recording area of the recording medium.

[0013] In this area, a control code that specifies the reproduction state of the audio at the time of reproduction is recorded, and when the audio signal is reproduced, the audio is reproduced based on the above-mentioned control code.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. In this embodiment, a high-definition VTR capable of recording and reproducing four-channel audio signals will be described as an example. In the configuration of Figure 1,
For example, radio waves from a broadcasting satellite are received by an antenna (not shown) and supplied to the tuner 1.

The tuner 1 separates the video signal and the audio signal. The video signal is supplied to the video signal processing circuit 4 of the VTR 3 via the video signal output terminal 2.

The audio signal is demodulated into a PCM audio signal as original data. For example, various audio modes, that is, audio formats are set for the audio as shown in FIG. 2, and the format mode signal representing this audio format is transmitted to the PC
It is added to the M audio signal. The PCM audio signal is supplied to a correction code adding circuit 6 of the VTR 4 via an audio signal output terminal 5. The control signal and format mode signal are then supplied to the controller 8 of the VTR 4 via the control signal output terminal 7 of the tuner 1.

The video signal processing circuit 4 performs signal processing on the video signal supplied from the tuner 1. The video signal subjected to signal processing is outputted via an output terminal 10 and is also supplied to a switching circuit 11 .

The correction code addition circuit 6 adds an error correction code to the PCM audio signal supplied from the tuner 1. The audio data to which the error correction code has been added is supplied to the memory unit 12, and the audio data is sent to the memory unit 12 according to the write control signal.
is stored in

The controller 8 determines the audio format of the supplied audio data based on the control signal and format mode signal supplied from the tuner 1. A keyboard for inputting data and a display section (not shown) are connected to the controller 8, and when it is necessary to select an audio mode, a message to that effect is displayed on the display section.

[0020] The user selects a desired audio mode by operating the keyboard while looking at the display section, and also sets a selection code and forms selection information in order to obtain a desired playback state. This selection information is supplied from the keyboard to the controller 8 via the input terminal 13.

The controller 8 manages audio formats and selection information. Based on this audio format and selection information, subcode data DSB to which an error correction code is added is formed. This subcode data D
SB is stored in the memory section 12 according to the write control signal.

[0022] During recording, data from the controller 8 to the memory section 12
According to the read control signal, audio data and subcode data DSB are read out from the memory section 12 and supplied to the recording signal processing circuit 14 .

In the recording signal processing circuit 14, (8-10)
The signal is subjected to signal processing such as modulation, addition of a sync pattern, and parallel/serial conversion, and then supplied to the switching circuit 11.

In the switching circuit 11, the connection state between each circuit block and the magnetic head 15 is switched under the control of a controller (not shown). As a result, the above-mentioned digitally modulated audio signal and analog video signal are
The signals are sequentially supplied to the magnetic head 15 and recorded on the magnetic tape 16.

[0025] When recording audio signals, all four channels of audio signals are recorded. In addition, in the configuration of Fig. 1,
Although only one magnetic head 15 is shown, the number of channels, the track T constituting the field or frame
A required number of magnetic heads are provided depending on the number of R's.

FIG. 3 shows the recording format. As shown in FIG. 3A, one frame is composed of 20 tracks formed by the magnetic head 15 on the magnetic tape 16 from track TR0 to track TR19.

The configuration of each track, for example track TR1, is shown in FIG. 3B. As shown in Figure 3B,
From the start end of the track, subcode data area AR1,
A PCM audio data area AR2 and an analog video signal recording area AR3 are provided, respectively.

The configuration of the above-mentioned subcode data area AR1 is shown in FIG. 3C. As shown in FIG. 3C, the subcode data area AR1 within the track includes block B
Consisting of LK 0 to 35, each block BLK
The bit length of is 1 word [=8 bits].

A sync pattern PSY is stored in block BLK0 on the starting end side of subcode data area AR1, a frame address is stored in block BLK1, and a track address is stored in block BLK2.

Block BLK 3 includes block BLK
Parity data obtained by adding the data of block BLK 1 and block BLK 2 is stored.

Furthermore, from block BLK 4 to block B
The 32 blocks BLK up to LK 35 store subcodes and error correction codes.

[0032] The above blocks BLK 4 to BLK 35
As shown in FIG. 4, subcode data DSB formed across tracks TR0 to TR19 includes a subcode, parity C2 applied horizontally to this subcode, and parity C2 applied vertically to this subcode. parity C
1. In FIG. 4, the numbers in the upper column represent the track numbers, and the numbers in the horizontal column represent the block BL.
It represents the symbol SYMB corresponding to K4 to BLK35.

In the recording format shown in this embodiment, 20 tracks TR0 to TR19 are recorded as one unit, so the correction codes are set as C1 (32, 28), as shown in FIG. In the case of C2 (20, 14), 392 [=14×28] words of subcode can be recorded for each unit.

An extended control signal SCE consisting of a format code representing the audio format shown in FIG. 2 and a selection code for selecting a channel for outputting audio is recorded in this subcode data DSB. Note that the above-mentioned format code is formed based on the format mode signal.

Next, the reproduction will be explained. During reproduction, the magnetic head 15 traces each track TR on the magnetic tape 16, and a reproduction signal is supplied to the switching circuit 11.

In the switching circuit 11, the audio signal and the video signal are separated, the video signal is supplied to the video signal processing circuit 4, and the audio signal containing the subcode data DSB is supplied to the reproduction signal processing circuit 17.

In the reproduced signal processing circuit 17, the audio signal is reproduced by performing signal processing such as equalization, serial/parallel conversion, detection of sync pattern PSY, and (8-10) demodulation. This audio signal is stored in the memory section 12 as audio data. Note that the audio data that is reproduced and stored in the memory section 12 is for all four channels.

In the memory section 12, the reproduced audio data is read out based on the readout control signal supplied from the controller 8. This audio data is processed by the error correction circuit 1.
Recorded in 8.

The error correction circuit 18 performs error correction, and the signal is further supplied to the matrix circuit 19. The controller 8 receives the expansion control signal SCE from the memory section 12.
The extended control signal SCE is read out from the matrix circuit 1.
9.

The matrix circuit 19 separates the audio data format code and selection code based on the above-mentioned extended control signal SCE. Then, based on the format code and selection code, the amplifier 25 and speaker 28 to which the audio data is supplied are determined. The above audio data is supplied to the D/A converter 26 of the selected amplifier 25, and the audio data is converted into an analog signal. This analog signal is amplified by an amplifier 27 and then supplied to a selected speaker 28.

The speaker 28, as shown in FIG.
3 channel speakers 28L, 28 in front of the user
C and 28R are arranged, and speakers 28LB and 28RB constituting one channel are arranged behind the user, which is the so-called 3-1 system. Audio is output from these speakers 28 based on a pre-specified playback state, thereby making it possible to automatically realize a desired playback state.

In this embodiment, the extended control signal SCE that defines the audio reproduction state and the audio reproduction state achieved thereby will be explained below.

FIG. 5 shows the extended control signal SCE recorded in the subcode data DSB. That is, this extended control signal SCE is recorded at the position of symbol SYMB [=0] in tracks TR0 to TR11.

A format code corresponding to each audio format shown in FIG. 2 is recorded in a four-word area AR10 from track TR0 to track TR3 among tracks TR0 to TR11.

[0045] Also, from track TR4 to track TR1
In the area AR20 of 8 words up to 1, a selection code regarding the reproduced audio is recorded for each channel. This selection code associates the four channels of recorded audio with each of the four channels of reproduced audio. This selection code is used for each of the four channels of playback audio.
In this system, an identification code for four channels of recorded audio is set, and the mix ratio of the audio data is defined by making the identification code correspond to the volume.

In the area AR20, a 2-word area AR21 in tracks TR4 and TR5 is used as a selection code for the first channel, and a 2-word area AR22 in tracks TR6 and TR7 is used as a selection code for the second channel. , truck TR8 and truck TR9
The 2-word area AR23 is used as the selection code for the third channel, and the 2-word area AR23 in
The word area AR24 is used as the selection code for the fourth channel.

For example, in the case of 4-channel stereo (12) in FIG. 2, the selection code of area AR21 is the first channel [L], and the selection code of area AR22 is the second channel [L].
Channel [R], the selection code of area AR23 corresponds to the third channel [C], and the selection code of area AR24 corresponds to the fourth channel [S].

Each selection code in areas AR21 to AR24 shown in FIG. 5 is further divided into four areas for each 4 bits. For example, as shown in FIG. 5, area AR21 is divided into areas AR31a to AR31d. This area AR
31a to 31d correspond to four channels related to recorded audio.

Area AR31a corresponds to the first channel of recorded audio, area AR31b corresponds to the second channel of recorded audio, area AR31c corresponds to the third channel of recorded audio, and area AR31d corresponds to the fourth channel of recorded audio. Corresponds to the channel.

In addition, in the case of three monaural systems (7) in FIG. 2, as shown in FIG.
The selection code for area AR23 is the second channel [“Sub-sound 1”], and the selection code for area AR23 is the third channel [“Sub-sound 2”].
], the selection codes recorded in the area AR24 respectively correspond to the fourth channel.

[0051] Each area AR21 to AR24 shown in FIG.
The selection code is further divided into four areas each having four bits. For example, as shown in FIG. 8, area AR21 is divided into areas AR32a to AR32d. This area AR
32a to 32d correspond to four channels related to recorded audio.

The area AR32a corresponds to the first channel of recorded audio ["main audio"], the area AR32b corresponds to the second channel of recorded audio ["sub audio 1"], and the area AR
32c corresponds to the third channel of recorded audio [“sub-audio 2”].

[0053] The above-mentioned areas AR31a to 31d and area A
R32a to 32d are each composed of 4 bits. If you do not mix audio, add an identification code to channels that do not output audio during playback.

Enter [0] and enter [F] as an identification code for the channel that outputs audio during playback.
]. Furthermore, when mixing audio, as an identification code expressed in 4 bits, [0 to F] expressed in hexadecimal digits correspond to the volume level.

For example, an example of specifying a playback mode will be explained with reference to FIGS. 6 to 8. Note that (12
) 4-channel stereo and (7) 3 monaural systems will be explained as examples.

(1) In the case of 4-channel stereo - Figure 6
Regarding A, a selection code [F000] is recorded in the area AR21. Each digit of this selection code corresponds to [1st channel to 4th channel], that is, [L, R, C, S], so during playback, the magnetic The audio signal recorded in the first channel on the tape 16 is reproduced and output. Similarly, since [0F00] is recorded in the selection code of the second channel, the audio signal recorded in the second channel on the magnetic tape 16 is played back from the second channel [R]. and output.

[0056] The selection code for the third channel is [00F
0] is recorded, the third channel [C]
From there, the audio signal recorded in the third channel on the magnetic tape 16 is reproduced and output. Since [000F] is recorded in the selection code of the fourth channel, the audio signal recorded in the fourth channel on the magnetic tape 16 is reproduced and output from the fourth channel [S]. .

To explain this state with reference to FIG. 7, in the area AR21 corresponding to the first channel [L],
Since [F] is set at the [L] position, the audio signal recorded in the first channel is reproduced and output from the speaker 28L.

[0058] Area AR corresponding to the second channel [R]
22, since [F] is set at the position of [R], the audio signal recorded in the second channel is reproduced and output from the speaker 28R.

Area AR corresponding to the third channel [C]
23, since [F] is set at the position of [C], the audio signal recorded in the third channel is reproduced and output from the speaker 28C.

Area AR corresponding to the fourth channel [S]
Since [F] is set in the position of [S] in channel 24, the audio signal recorded in the fourth channel is reproduced and output from speakers 28LB and 28RB.

(2) In the case of 4-channel stereo - Figure 6
Regarding B, a selection code [00F0] is recorded in the area AR21. Therefore, during reproduction, the audio signal recorded in the third channel on the magnetic tape 16 is reproduced and output from the first channel [L]. Similarly, since the selection code [000F] is recorded in the area AR22, the audio signal recorded in the fourth channel on the magnetic tape 16 is played back from the second channel [R]. and output.

The selection code in areas AR23 and AR24 is

Since [0000] is recorded, no audio is output from the third channel [C] and the fourth channel [S].

To explain this state with reference to FIG. 7, in the area AR21 corresponding to the first channel [L],
Since [F] is set at the position [C], the audio signal recorded in the third channel is reproduced and output from the speaker 28L.

Area AR corresponding to the second channel [R]
22, since [F] is set in the position of [S], the audio signal recorded in the fourth channel is reproduced and output from the speaker 28R.

Regarding the audio from the third channel [C] and the fourth channel [S], the area AR23 and the area A
Any R24 selection code

[0000], [F
] is not set, so speakers 28C and 28
No audio is output from LB and 28RB.

(3) In the case of 4-channel stereo - Figure 6
Regarding C, a selection code [F070] is recorded in the area AR21. Therefore, during reproduction, the audio signals recorded on the first channel and the third channel on the magnetic tape 16 are reproduced and output from the first channel [L]. In this case, the level of the first channel is [F] and the level of the third channel is [7], so the volume ratio of the first channel and the third channel is [1:( 1/2) ].

Similarly, a selection code [0F07] is recorded in the area AR22. Therefore, when playing,
From the second channel [R], the audio signals recorded on the second channel and the fourth channel on the magnetic tape 16 are reproduced and output. In this case, the level of the second channel is [F] and the level of the fourth channel is [7], so the second channel and
The volume ratio of the fourth channel is [1:(1/2)].

To explain this state with reference to FIG. 7, in the area AR21 corresponding to the first channel [L],
[F] is set at the [L] position, and [7] is set at the [C] position.
] is set, so the first
The volume ratio of the channel and the third channel is [1:(1/
2) ] and the mixed audio is output.

Area AR corresponding to the second channel [R]
22, [F] is set in the position of [R], and [S
] is set to [7], so the speaker 28
From R, mixed audio is output with the volume ratio of the second channel and the fourth channel being [1:(1/2)].

The area AR23 and the area AR24 corresponding to the third channel and the fourth channel are both [0000
], so speakers 28C and 28LB, 2
No audio is output from 8RB.

(4) Figure 8 for the case of three monaural systems
In each of the areas AR21 to AR23, a selection code [F000] is recorded. Therefore, during reproduction, the audio signal recorded in the first channel on the magnetic tape 16 is reproduced and output from the first to third channels [L, C, R].

[0072] The selection code for the fourth channel is [000
0] is recorded, the 4th channel [S]
There is no sound output from.

To explain this state with reference to FIG. 7, areas AR21 to AR23 corresponding to the first to third channels
Since [F] is set at the [main audio] position in the middle, speakers 28L, 28R, and 28C
The audio signal recorded in the channel is played back and output.

Regarding the audio from the 4th channel, the selection code in area AR24 is

[0000],
[F] is not set, so speakers 28LB, 2
No audio is output from 8RB.

In this way, the desired playback state is set using the extended control signal SCE consisting of the audio format code and the selection code, the extended control signal SCE is recorded, and during playback, the desired playback state is set based on the above-mentioned format code and selection code. The audio signal is reproduced.

[0076] Therefore, a desired reproduction state can be automatically achieved without manual operation by the user. Even if there are many audio broadcasting formats such as satellite broadcasting, a desired reproduction state can be achieved in the same way.

[0077] While preventing changes (deterioration) in the original voice,
A desired playback state can be achieved, and if automatic selection is performed, the mode can be changed midway.

[0078] Furthermore, since the audio signals of different channels can be mixed at a desired mix ratio and the audio can be automatically played back in the mixed state, the following playback modes, which were difficult with conventional technology, are extremely easy. can be realized. (A) Background music mode (hereinafter referred to as B
(referred to as GM mode) Music is recorded by after-recording, and for example, the original sound is played back at a mix ratio of 80% and the music is 20% to give a BGM effect. (B) Narration mode The narration (commentary) is recorded by after-recording, and for example, the original sound is played back at a mix ratio of 20% and the narration at 80%, and the original sound is played back where the narration is not included.

[0079] The audio to be output from each of the four channel speakers is recorded as a selection code, the desired playback state is specified, and at the time of playback, the audio signal is played back based on the above-mentioned selection code. Even when performing after-recording, it is possible to extremely easily realize the optimal playback state according to the purpose of after-recording, and also to prevent errors in the playback state. For example, on a magnetic tape 16 on which four channels are recorded,
This prevents erroneous playback when performing after-recording on only two channels.

In this embodiment, the matrix circuit 19
Although a digital matrix circuit is used, the present invention is not limited to this, and an analog matrix circuit can also be used. In this case, the D/A converter 26 may be provided at a subsequent stage.

Furthermore, in a low-cost model, the matrix circuit 19 may be omitted and a switch circuit may be used instead.

[0082]

According to the recording/reproducing apparatus according to the present invention, during recording, an area for recording a control code is set in a predetermined recording area of the recording medium, and a control code specifying the audio reproduction state is stored in the area. is recorded, and when the audio signal is played back, the sound is played back based on the above-mentioned control code, so there is an effect that a desired playback state can be automatically realized. This makes it possible to achieve a desired reproduction state even when there are many audio broadcasting formats, such as satellite broadcasting.

[0083] Another advantage is that it is possible to achieve the desired playback state while preventing changes (deterioration) in the original sound, and when automatic selection is used, it is possible to change the mode midway. It has the effect of becoming.

Furthermore, since the audio signals of different channels can be mixed at a desired mix ratio and the audio can be automatically played back in the mixed state, it is possible to create background music using after-recording, which was difficult with conventional technology. This has the effect that modes such as mode, narration mode, etc. can be easily realized.

[0085] Even when performing after-recording, it is possible to extremely easily realize the optimal playback state according to the purpose of after-recording, and there is also an effect that errors in the playback state can be prevented.

[Brief explanation of the drawing]

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

FIG. 2 is a schematic diagram showing the audio format of satellite broadcasting.

FIG. 3 is a schematic diagram showing a recording format.

FIG. 4 is a schematic diagram showing the data structure of subcode data.

FIG. 5 is a schematic diagram showing the configuration of an extended control signal.

FIG. 6 is a schematic diagram showing an example of setting a selection code.

FIG. 7 is an explanatory diagram showing the arrangement of speakers of the 3-1 system.

FIG. 8 is a schematic diagram showing an example of setting a selection code.

[Explanation of symbols]

3 VTR 8 Controller 12 Memory section DSB Subcode data SCE Extension control signal AR1 Subcode data area AR21-AR24, AR31a-AR31d, AR3
2a~AR32d area

Claims (1)

[Claims] Claim 1: In a recording/playback device that records and plays back control codes and audio data of multiple channels, the control code is such that at least a code that specifies the playback state of sound during playback is recorded. A recording/playback device characterized by: