JPH04114363A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform such control that an output form according with the mode based on the classification discrimination result of the audio mode is obtained by comparing outputs of reproducing means from L-side hifi and normal tracks. CONSTITUTION:At the time of reproducing the recorded stereo broadcast, the L channel audio signal from a hifi L channel recording/reproducing circuit 4 and the L+R audio signal from a normal audio recording/reproducing circuit 6 are compared with each other by a level comparator 7. When receiving a signal indicating the stereo broadcast recording, an output switching circuit 8 is set to the stereo audio reproducing mode where outputs from the circuit 4 and a hifi R channel recording/reproducing circuit 5 are simultaneously outputted. At the time of reproducing the bilingual broadcast recording, main audio signals from circuits 4 and 6 are compared with each other. When receiving a signal indicating bilingual or monaural recording, the circuit 8 is set to the audio reproducing mode where only the audio signal from the circuit 6 is outputted, and main sounds are automatically outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device such as a VTR, and in particular,
The present invention relates to a magnetic recording and reproducing device suitable for use in reproducing a tape recorded with audio multiplex broadcasting.

[Conventional technology]

Conventional VTRs, for example, service technical data: Hitachi Hi
-F i digital memory video deck VT-Z5
0. VT 270; VTR No. 134-1 (August 1988) Two-circuit logic edition, page 2, the playback audio output mode for audio multiplex broadcasting is selected by a manual switch. , unless the switch for selecting the playback audio mode is operated, the playback audio output mode last set during the past playback is maintained.

Therefore, for example, when playing back a tape on which 2 was recorded as a Japanese language broadcast during the previous playback, if you select and set the output of only the main audio, and then play back a tape that was recorded as a stereo broadcast,
Only the left channel is output, and in order to obtain audio output for both left and right channels, it was necessary to manually switch the playback audio mode selection switch to switch the playback audio output mode.

[Problem to be solved by the invention]

As mentioned above, in the conventional technology, when playing back a tape on which audio multiplex broadcasting is recorded, no consideration is given to automatically determining the audio multiplexing mode type, and each time the audio multiplexing mode type changes, It is necessary for the user to operate a switch to change the playback audio output mode, which poses a concern regarding so-called usability.

The present invention has been made in view of the above points, and its object is to provide an easy-to-use magnetic recording system that can automatically switch the playback audio output mode according to the recorded audio mode when playing a tape. The purpose is to provide a playback device.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides stereo broadcasting,
Equipped with a function that receives audio multiplex broadcasts such as bilingual broadcasts and monaural broadcasts, detects the type of audio mode, and records audio signals separated as appropriate according to the type of audio mode on predetermined tracks of the magnetic tape. In addition, a first audio signal reproducing means for reproducing a signal from a high-fidelity track of a magnetic tape recording an audio signal on the left channel side (hereinafter referred to as the downstream side), and a first audio signal reproducing means for reproducing the signal from the high-fidelity track of the magnetic tape on which the audio signal on the left channel side (hereinafter referred to as the R side), and the right channel side (hereinafter referred to as the R side).
a second audio signal reproducing means for reproducing a signal from a high-fidelity track of a magnetic tape on which an audio signal is recorded; a third audio signal reproducing means for reproducing a signal from a normal track of a magnetic tape on which an audio signal is recorded; Second. The outputs from the third audio signal reproducing means are output individually, or the outputs from the first audio signal reproducing means are output separately.
．． output switching means capable of selecting either mode of outputting the output from the second audio signal reproduction means at the same time;
In the magnetic recording and reproducing device, the output of the first audio signal reproducing means and the output of the third audio signal reproducing means are compared to determine the type of audio mode, and the type of audio mode is determined according to the mode based on the determination result. a discrimination control means for controlling the output switching means so that the output mode is set to the output mode;
or an audio mode identification signal superimposition method that records an audio mode identification signal generated according to the audio mode type of the broadcast received during recording in a superimposed manner on, for example, a vertical retrace period of the video signal. and a discrimination control means for detecting an audio mode identification signal superimposed on the video signal during playback and controlling the output switching means so that the output mode corresponds to the audio mode based on the detection result. The structure is said to be

[Effect]

In the invention according to claim 1, the first audio signal reproducing means for reproducing the signal from the L-side high-fidelity track and the third audio signal reproducing means for reproducing the signal from the normal track by the discrimination control means during reproduction. If the comparison results match, 1, for example, rHJ (
Alternatively, a signal at the "L" (or "H") level is output if the comparison results do not match, and a signal at the "L" (or "H") level is output. That is, when a tape recording a stereo broadcast is played back, the L channel audio signal is played from the L side high-fidelity track, and the L+R audio signal is played from the normal track, so these are compared by the discrimination control means. This allows it to be determined that it is a stereo broadcast recording, and a signal indicating that it is a stereo broadcast is sent to the output switching means, thereby producing stereo audio in which the playback outputs from the L side and R side hi-fi tracks are simultaneously output. The playback mode will be automatically selected. On the other hand, when playing back a tape recording a bilingual broadcast, the main audio signal is played from the left high-fidelity track, the main audio signal is similarly played from the normal track, and the two match. Even when a tape recording monaural broadcasting is played back, the same audio signal is played back from the L-side high-fidelity track and the normal track, so they match, and the discrimination control means determines that the audio mode is other than stereo broadcasting. can. If the audio mode is other than stereo broadcasting, a signal indicating this is sent from the discrimination control means to the output switching means, and in this case, the output switching means outputs only the playback output from the normal track, for example. The audio playback mode that outputs only the main audio is automatically selected in the case of a bilingual broadcast recording tape.

In the invention according to claim 2, for example, a signal indicating that the broadcast is a bilingual broadcast and a signal indicating that the broadcast is a broadcast other than the bilingual broadcast are used as an audio mode identification signal during the vertical retrace period of the video signal during recording. Signal (on the other hand)

(It is also possible that there is no audio mode identification signal) is recorded in a superimposed manner. When the discrimination control means determines that the broadcast is bilingual based on the audio mode identification signal superimposed on the reproduced video signal during playback, it is automatically placed in an audio playback mode that outputs only the main audio, and If it is determined that it is something other than broadcasting, it is automatically placed in an audio reproduction mode in which the reproduction outputs from the L side and R side hi-fi tracks are output at the same time.

〔Example〕

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 1 shows a home high-fidelity V according to a first embodiment of the present invention.
This is a block diagram of the main parts of the TR. In the figure, 1 is a tuner, 2 is an audio multiplexing demodulation circuit, 3 is an L+R/Main switching circuit, 4 is a high-fidelity upper channel recording/playback circuit, and 5 is a high-fidelity R channel recording/playback circuit. circuit, 6 is a normal audio recording/playback circuit, 7 is a level comparator, 8 is an output switching circuit, 9a to 9c are audio output terminals, 10a to 1
0C is an audio signal input terminal from the tape playback system.

During recording, the audio signal received by the tuner 1 is sent to the audio multiplex demodulation circuit 2, and the broadcast audio mode (stereo broadcast, bilingual broadcast, monaural broadcast) is determined based on the identification signal included in the received audio signal. At the same time, they are separated as appropriate depending on the broadcast audio mode. When receiving a stereo broadcast, the L channel audio signal and the R channel audio signal are sent from the audio multiplexing demodulation circuit 2 to the high-fidelity upper channel recording/reproducing circuit 4 and the high-fidelity R channel recording/reproducing circuit 5, respectively. By the fight channel record B/playback circuit 4 and the high-fidelity R channel recording/playback circuit 5, the L side of the magnetic tape,
An L channel audio signal and an R channel audio signal are respectively recorded on the R side hi-fi track. In addition, from the audio multiplex demodulation circuit 2 to the L+R/Main switching circuit 3
The L channel audio signal and the R channel audio signal sent to the
In the n switching circuit 3, the L+R audio signal (monaural signal) is obtained by adding the L channel audio signal and the R channel audio signal, and the L+R audio signal is sent to the normal audio recording/reproducing circuit 6. The L+R audio signal is recorded on the normal track of the magnetic tape.

On the other hand, when receiving bilingual broadcasting, the audio multiplex demodulation circuit 2
A main audio signal (Main audio signal) is sent from the hi-fi upper channel recording/reproducing circuit 4, and a sub audio signal (Sub audio signal) is sent to the hi-fi R channel recording/reproducing circuit 5. The main audio signal is recorded on the R side hi-fi track, and the sub audio signal is recorded on the R side high-fidelity track. In response to the Japanese language switching signal, only the main audio signal is output, so that only the main audio signal is recorded on the normal track of the magnetic tape.

Furthermore, when receiving monaural broadcasting, the high-fidelity channel recording/playback circuit 4. Hi-Fi R Channel Record 8/
Regeneration circuit 5. The same audio signal is sent to the normal audio multiplexing and demodulation circuit 6 on the L side.

The same audio signal is recorded on both the R side high-fidelity track and the normal track.

In the above configuration, during playback, signals from the tape playback system are input to the audio signal input terminals 10a to 10c, and the L
The signal from the side hi-fi track is sent to the hi-fi upper channel recording/reproducing circuit 4, and the signal from the R-side hi-fi track is sent to the hi-fi R channel recording/reproducing circuit 5.
The signals from the normal tracks are respectively reproduced by the normal audio recording/reproducing circuit 6 and sent to the output switching circuit 8. In addition, the output of the high-fidelity channel @/playback circuit 4 and the normal audio recording/playback circuit 6 are also shown.
The outputs of are sent to the level comparator 7 and compared.

Now, when a stereo broadcast recording is played back, the level comparator 7 compares the L channel audio signal from the high-fidelity upper channel recording/playback circuit 4 with the L+R audio signal from the normal audio recording/playback circuit 6. . in this case,
Naturally, the two signals are different, so based on this, the level comparator 7 determines that it is a stereo broadcast recording,
A signal indicating that it is a stereo broadcast recording is output to the output switching circuit 8. When the output switching circuit 8 receives a signal indicating that it is a stereo broadcast recording, the output switching circuit 8 enters a stereo audio reproduction mode in which outputs from the high-fidelity upper channel recording/reproducing circuit 4 and the high-fidelity R channel recording/reproducing circuit 5 are simultaneously output. Therefore, when playing back a stereo broadcast recording, stereo audio is automatically output.

On the other hand, when reproducing a bilingual broadcast record, the level comparator 7 compares the main audio signal from the high-fidelity upper channel recording/playback circuit 4 with the main audio signal from the normal audio recording/playback circuit 6. Ru.

In this case, since both signals are the same, the level comparator 7 determines that the audio mode is other than stereo broadcast recording, and outputs a signal indicating this (a signal indicating bilingual or monaural). Output to the switching circuit 8. When the output switching circuit 8 receives a signal indicating the above-mentioned two languages or monaural, it enters an audio playback mode in which only the audio signal from the normal audio recording/playback circuit 6 is output, and the main audio is automatically output. The Rukoto.

When reproducing a monaural recording, the process is exactly the same as when reproducing a bilingual broadcast recording, and only the audio signal from the normal audio recording/reproducing circuit 6 is output.

In this embodiment, only the audio signal from the normal audio recording/playback circuit 6 is output when bilingual broadcast records and monaural recordings are played. Only the audio signal from the circuit 4 may be output, or the audio signals from the normal audio recording/reproducing circuit 6 and the high-fidelity channel recording/reproducing circuit 4 may be output simultaneously.

In this embodiment, which has such a configuration and operation mode, when playing back a stereo broadcast recording, the left and right channel audio signals are automatically output simultaneously, and when playing back a bilingual broadcast recording, the audio signals are automatically output simultaneously. Since the main audio is output to , the playback audio output mode can be automatically switched according to the recorded audio mode, without having to manually switch the playback audio mode each time as in the past, improving usability. do.

FIG. 2 shows a home high-fidelity V according to a second embodiment of the present invention.
This is a blog diagram of the main parts of TR, in which 1 is a tuner, 2 is an audio multiplexing demodulation circuit, and 3 is L + R / Ma
in switching circuit, 4 is a high-fidelity channel recording/playback circuit, 5 is a high-fidelity R channel recording/playback circuit,
6 is a normal audio recording/playback circuit, 8 is an output switching circuit, 9a to 9C are audio output terminals, and 10a to 10c are audio signal input terminals from the tape playback system, and these are the components shown in FIG. 1 above. It is equivalent to Also, 11
12 is a video/audio mode identification signal MIX circuit, 12 is a video recording/playback circuit, 13 is a video signal input terminal, 14 is a video signal input terminal from the tape playback system, 15 is an audio mode identification signal generation circuit, and 16 is an audio mode This is an identification signal detection/discrimination circuit.

During recording, the audio signal received by the tuner 1 is sent to the audio multiplex demodulation circuit 2, and the broadcast audio mode (stereo broadcast, bilingual broadcast, monaural broadcast) is determined based on the identification signal included in the received audio signal. At the same time, they are separated as appropriate depending on the broadcast audio mode. The signal indicating the broadcast audio mode type described above is transmitted to the audio mode identification signal generation circuit 1.
5, and the audio mode identification signal generation circuit 15 generates an identification signal indicating bilingual broadcasting in the case of bilingual broadcasting, and in the case of broadcasting audio mode other than bilingual broadcasting. An identification signal indicating this is generated. Note that in this embodiment, since it is sufficient to be able to distinguish between bilingual broadcasting and other broadcasting, there is no problem in generating only an identification signal indicating that it is one of them. The audio mode identification signal generated in the audio mode identification signal generation circuit 15 is sent to the video/audio mode identification signal MIX circuit 11 to which the video signal demodulated by the tuner 1 is input, and the audio mode identification signal is In the MIX circuit 11, the video signal is superimposed on the vertical retrace period of the video signal, and recorded on the video track of the magnetic tape by the video recording/reproducing circuit 12.

Furthermore, the audio signal received by the tuner 1 is recorded in exactly the same manner as in the first embodiment, depending on the broadcast audio mode type. That is, when receiving a stereo broadcast, an L channel audio signal and an R channel audio signal are recorded on the L side and R side high-fidelity tracks of the magnetic tape, respectively, and an L+R audio signal is recorded on the normal track. Furthermore, when receiving bilingual broadcasting, the main audio signal is recorded on the L-side high-fidelity track, the sub-audio signal is recorded on the R-side high-fidelity track, and only the main audio signal is recorded on the normal track.

Furthermore, when receiving monaural broadcasts, the L side.

The same audio signal is recorded on both the R side high-fidelity track and the normal track.

When the tape on which the audio mode identification signal is superimposed and recorded during the vertical retrace period of the video signal is played back as described above, the video recording/playback circuit 12 receives the video signal picked up from the tape from the video signal input terminal 14. reproduces the input signal and outputs it from the video signal output terminal 13.

The output video signal of the video recording/reproducing circuit 12 is also sent to the audio mode identification signal calibration/discrimination port 116, and the audio mode identification signal superimposed as described above is detected, and the audio mode identification signal is detected. - In the discrimination circuit 16,
It is determined whether the identification signal indicating bilingual broadcasting is an identification signal indicating an audio mode other than bilingual broadcasting, and accordingly, a bilingual/stereo (monaural) switching signal is sent to the output switching circuit 8. Output.

Similarly to the first embodiment, the output switching circuit 8 receives the signal of the L-side hi-fi track from the hi-fi upper channel B/reproduction circuit 4, and the signal of the R-side hi-fi track from the hi-fi R channel recording/reproduction circuit 5. , the signals from the normal track are input to the normal audio multiplexing and demodulating circuit 6, and the audio mode identification signal detection and
The output form is switched by a bilingual/stereo (monaural) switching signal from the discrimination circuit 16.

When a bilingual broadcast record is played back, an identification signal indicating bilingual broadcasting is detected, and the audio mode identification signal detection/discrimination circuit 16 sends out an instruction signal to output only the main audio. At least one of the output of the audio recording/reproducing circuit 6 and the output of the high-fidelity channel recording/reproducing circuit 4 is automatically selected and output. In addition, when a stereo broadcast record or a monaural broadcast record is played back, an identification signal indicating that the broadcast is other than a bilingual broadcast is detected, and the audio mode identification signal detection/discrimination port @16 is output from the L side hi-fi track. An instruction signal is sent to simultaneously output the signal from the R-side hi-fi track and the output from the hi-fi upper channel recording/reproducing circuit 4 and the output from the hi-fi R channel recording/reproducing circuit 5. Ru.

The present embodiment having such a configuration and operation mode also provides the same effects as the first embodiment.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to automatically switch the playback audio output mode according to the type of recorded audio mode without requiring manual operation as in the conventional case, which is convenient for the user. This type of VTR has great value.

[Brief explanation of the drawing]

FIG. 1 shows a home high-fidelity V according to a first embodiment of the present invention.
Block diagram of main parts of TR FIG. 2 is a block diagram of main parts of a home high-fidelity VTR according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Tuner, 2... Audio multiplexing demodulation circuit, 3-L+R/Main switching circuit, 4...
HiFi top channel recording/playback circuit. 5... Hi-Fi R channel recording/playback circuit, 6...
- Normal audio recording/playback circuit, 7... Level comparator, 8... Output switching circuit, 11... Video/audio mode identification signal MIX circuit. 12...Video recording/reproduction circuit, 15...Audio mode identification signal generation circuit, 16...Audio mode identification signal detection/discrimination circuit.

Claims (1)

[Claims] 1. Receive audio multiplex broadcasts such as stereo broadcasts, bilingual broadcasts, or monaural broadcasts, detect the type of audio mode, and magnetically separate audio signals as appropriate according to the type of audio mode. A first audio signal reproducing means has a function of recording each on a predetermined track of the tape, and reproduces a signal from a high-fidelity track of the magnetic tape on which the audio signal of the left channel side is recorded; A second audio signal reproducing means for reproducing the signal from the high-fidelity track of the recorded magnetic tape, and a monaural signal or bilingual main audio signal that is the sum of the audio signal on the left channel side and the audio signal on the right channel side. a third audio signal reproducing means for reproducing the signal from the normal track of the magnetic tape on which is recorded, and the outputs from the first, second and third audio signal reproducing means are each output independently, or In a magnetic recording and reproducing apparatus, the magnetic recording and reproducing device includes an output switching means that can select either mode of simultaneously outputting the outputs from the first and second audio signal reproducing means, wherein the first audio signal reproducing means and the output of the third audio signal reproducing means to determine the type of audio mode, and control the output switching means to select an output form corresponding to the mode based on the determination result. means,
A magnetic recording/reproducing device characterized in that: 2. Receive audio multiplex broadcasts such as stereo broadcasts, bilingual broadcasts, and monaural broadcasts, detect the type of audio mode, and separate audio signals as appropriate according to the type of audio mode onto predetermined tracks of the magnetic tape. Equipped with a recording function,
a first audio signal reproducing means for reproducing the signal from the high-fidelity track of the magnetic tape on which the audio signal on the left channel side is recorded; and a first audio signal reproducing means for reproducing the signal from the high-fidelity track on the magnetic tape on which the audio signal on the right channel side is recorded. The second audio signal reproducing means reproduces a signal from a normal track of a magnetic tape on which a monaural signal obtained by adding the left channel side audio signal and right channel side audio signal or a bilingual main audio signal is recorded. outputs from the third audio signal reproducing means and the first, second, and third audio signal reproducing means, respectively;
in a magnetic recording and reproducing apparatus, which is equipped with an output switching means that can select one of two modes: output from the audio signal reproducing means simultaneously, depending on the type of the audio mode of the broadcast received at the time of recording. an audio mode identification signal superimposing means for superimposing and recording the generated audio mode identification signal on the video signal; detecting the audio mode identification signal superimposed on the video signal during playback; 1. A magnetic recording and reproducing apparatus, further comprising a discrimination control means for controlling said output switching means so as to obtain an output form. 3. In claim 2, if it is determined during playback that bilingual broadcasting is recorded, the output switching means automatically switches to a state of outputting only the main audio signal,
The magnetic device is characterized in that the output switching means is configured to automatically switch to a state in which audio signals of both left and right channels are output when it is determined that the audio signal is recorded in a format other than bilingual broadcasting during playback. Recording and playback device.