JPH0468882A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To save labor for operating a sound output changeover switch in the case of reproduction by instantaneously identifying either stereo television or audio multiplex television in the case of reproduction, displaying it and preferentially outputting a main sound from a sound output in the case of reproduction due to audio duplex television. CONSTITUTION:Oscillation frequencies f1 and f2 of a stereo television identification adding signal and of a duplex sound identification adding signal are set about between 20KHz-30KHz. In the case of picture recording, a stereo (audio duplex) television identification adding signal generation circuit 72 (74) is operated, and a sound signal and the f1 and f2 are mixed and recorded through a HiFi sound recording (reproducing) head 10 onto a tape. Next, in the case of reproduction, signals from the head 10 are inputted to a stereo television identification filter circuit 101 and an audio duplex television identification filter circuit 102. When the f1 is detected, a stereo television display device 72 is operated and when the f2 is detected, an audio duplex television display device 73 is operated. On the other hand, when the f1 and f2 are simultaneously detected, a sound output switching circuit 87 is operated to automatically output the main sound of the audio duplex television at both an LCH and an RCH.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing device capable of recording and reproducing audio multiplex broadcasts.

[Conventional technology]

FIG. 3 shows a conventional magnetic recording/reproducing device.

In the figure, ■ is an antenna, 2 is a tuner, 3 is a video demodulation/detection circuit (hereinafter referred to as VIF), 4 is a video recording circuit,
5 is a video recording (playback) head, 6 is an audio demodulation and detection circuit C
Hereinafter referred to as SIF. ), 7 is an audio multiplex demodulation circuit (hereinafter M
(referred to as PX DEC), 8 is a HiFi audio circuit, 9
is a linear audio circuit, IO is HiFi audio recording (playback) -
・7C and 11 are C to linear audio recording (playback).

Next, the operation will be explained.

The signal received by the antenna 1 is tuned by the tuner 2, detected as a video signal by the VIF 3, and sent to the video recording circuit 4. The video is recorded on the tape via the video recording (playback) head 5.

On the other hand, the audio signal is detected as an audio signal by 5IF6,
In the case of an audio multiplexed signal, it is demodulated at the next stage MPX-DEC 7. For HiFi, this signal is recorded on the tape via the HiFi audio circuit 8, HiFi audio recording (playback) hand 10, and the linear audio is recorded on the tape via the linear audio circuit 9.linear audio recording (playback) hand. be done.

: The problem that the invention attempts to solve.

Conventional magnetic recording and reproducing devices are configured as described above, and although they can demodulate and record audio multiplex broadcast signals, they do not record identification signals that identify the recorded signals during playback, so the audio signals are It is impossible to tell instantly without monitoring, especially when playing a tape recorded with dual audio broadcasts, the main audio is output from the left of the left and right speakers (or headphones), and the sub audio is output from the right. At this time, the user needs to use the audio output switch switch to select which one is the - (generally speaking, switch to the main audio and listen to the main audio from the left and right speakers). The problem was that it was inconvenient.

The second invention was made to solve the above-mentioned problems, and it instantly identifies and displays stereo broadcasts or audio multiplex broadcasts during playback, and particularly when playing dual audio broadcasts, the main audio is prioritized and the audio is The object of the present invention is to obtain a magnetic recording/reproducing device that outputs output.

:Means for Solving the Problems]- The magnetic recording and reproducing device according to the present invention is provided with an audio multiplexing demodulation circuit section ↓, and has two channels for obtaining an audio multiplexing broadcast display output.
two oscillation circuits that generate two identification signals; means for multiplexing recording in a possible frequency band; means for detecting the identification signal during playback; means for displaying the audio multiplex broadcast or stereo broadcast using the output of the detecting means; and the output of the detecting means. In the case of audio multiplex broadcasting using the above system, the main audio is given priority to the main audio during playback and is output from the audio output.

[Function] In the present invention, the additional identification signal corresponding to the audio multiplex broadcast display of the audio multiplexing and demodulation circuit is outside the frequency band of the HiFi audio recording signal or the low frequency conversion color signal of the video signal and Audio multiplex broadcasting or stereo broadcast display is performed by multiplex recording in a frequency band that allows recording and playback, and especially in the case of audio multiplex broadcasting, main audio can be given priority and output from the audio output during playback.

〔Example〕

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

FIG. 1 shows a magnetic recording/reproducing apparatus according to an embodiment of the present invention.

In the figure, 1 is the antenna, 2 is the tuner, and 3 is the VI
P, 4 video recording circuit, 5 video recording (playback) head, 6
is SIF, 7 is MPX-DEC18 is f (i F i audio circuit (recording system), 9 is linear audio circuit (recording system), 1
0 is a HiFi audio recording (playback) head, 11 is a linear audio recording (playback) head, 49 is a video playback circuit, 71 is a stereo broadcast display device, 72 is a stereo broadcast identification additional signal generation circuit, 73 is a dual audio broadcast display 74 is a double audio broadcast identification additional signal generation circuit, 81 is a peak noise reduction encoder (hereinafter referred to as PNR-E), and 82 is a Hi
Fi voice identification additional signal mixing circuit (hereinafter referred to as A-1-MIX)
, 83 is an FM modulation circuit (hereinafter referred to as FM-MOD), 84 is a HiFi audio circuit (reproduction system), 85 is an FM demodulation circuit (hereinafter referred to as FM-DEM), 86 is a peak noise reduction decoder (hereinafter referred to as PNR-D), and 87 is an Audio output switching circuit, 91 is a linear audio circuit (reproduction system), 101 is a stereo broadcast identification filter circuit, 102 is a dual audio broadcast identification filter circuit, 201 is an L CH audio output terminal, 20
2 is an RcH audio output terminal.

Next, the operation will be explained.

The steps up to the stage of demodulation by MPX-DEC7 are completely the same as the conventional method, and will therefore be omitted.

Next, when the audio multiplex signal is demodulated, in the case of stereo broadcast 1, the stereo broadcast display device 71 operates and the display device lights up, and in the case of dual audio broadcast, the dual audio broadcast display device 73 operates, and the display device lights up. lights up.

Correspondingly, in the present invention, the stereo broadcast identification additional signal generation circuit 72 or the dual audio broadcast identification additional signal generation circuit 74 operates in accordance with the operation of the display devices 71 and 73.

Here, if each oscillation frequency of the stereo broadcast identification additional signal and the dual audio identification additional signal is f,,C2, in the present invention, f,,C2 corresponds to the HiFi audio signal band 207 to 20K.
Frequency that is outside the Hz band and can be recorded and reproduced, for example, 20
Set between KHz and 30 KHz. That is, 20
to seven < f + < f 2 < 30 K seven or 2
0KHz<fz<f, <30KHz.

Next, the output of the MPX-DEC7 is transmitted to the HiFi audio circuit (recording system) 8, in which the audio signals processed by the PNR-C81 are mixed by the A.r-MIX82, and then The FM-MOD83 in the stage performs FM demodulation and HiF
i The audio is recorded on the tape via the audio recording (playback) head 10.

During playback, the signal output through this head ]O is
The iFi audio circuit (playback system) 84 is manually powered. The signal FM demodulated by FM-DEM85 in 2 is P NP −
It is processed in D86 and sent to the next stage audio output switching circuit 87. On the other hand, the output signal of the FM-DEM 35 is branched to the stereo broadcast identification filter circuit 101. The signal is sent to the dual audio broadcast identification filter circuit 102. Each of these has band-limiting filter characteristics of rf2, so f
When detecting l, the stereo broadcast display W7 is displayed even during playback.
Similarly, when C2 is detected, the dual audio broadcast display device 73 is operated. At the same time, [, when detected, LCI
I audio output terminal 201. The LCM and RCH sounds of the audio output switching circuit 87 are sent to the Rc and audio output terminals 202, respectively, but when C2 is detected, the audio output switching circuit is activated and the LCH audio output terminals 201. Both Rc and l audio output terminals 202 operate to automatically output L C11, that is, the main audio of dual audio broadcasting. The video signal is exactly the same as the conventional one.

FIG. 2 shows a magnetic recording/reproducing apparatus according to another embodiment of the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. 41 is a luminance signal recording circuit, 42 is a color signal recording circuit,
43 is a color signal and identification additional signal mixing circuit, 45 is a luminance 1 sudden signal mixing recording amplifier, 51 is a luminance signal reproducing circuit, and 52 is a chrominance signal reproducing circuit.

Next, the operation will be explained.

If the respective oscillation frequencies of the stereo broadcast identification additional signal and the dual audio broadcast identification additional signal are fl' and C2', in the present invention, C1' and C2' can be recorded and reproduced in the low range outside the band of the low frequency conversion color signal. Frequency, e.g. 50KHz~100K
Set between Hz. That is, 50KHz<f+'<f
z'<100 or 50<C2'<f +'
<100 KHz.

Here, the output of the color signal recording circuit 42 and C1'.

fz+ is mixed in a chrominance signal and an additional signal mixing circuit 43 for each lsi, and is recorded by the video recording (reproduction) head 5 together with the luminance signal recording circuit 41 in the luminance 1 sudden signal mixing recording amplifier 45 at the next stage. During reproduction, the luminance signal component of the signal output through the head 5 is sent to the luminance signal reproducing circuit 51, and the chrominance signal component is sent to the chrominance signal reproducing circuit 52. f, ', f2' recorded multiplexed with the low frequency converted color signal is sent to the color signal reproducing circuit 5.
Stereo broadcast identification filter circuit 101.2 branches from the low frequency conversion color signal stage of 101. The signal is sent to the dual audio broadcast identification filter circuit 102.

Each of these has band-limiting filter characteristics of f, ', f2', so when f, ' is detected, the stereo broadcast display device 72 is operated even during playback, and similarly, when C2' is detected, The dual audio broadcast display device 73 is operated. Also, when f1 is detected at the same time, the L CH audio output terminal 201
．． The RcH audio output terminal 202 has an audio output switching circuit 8.
7 glue. H%RCH audio is sent to each, but f2'
At the time of detection, the audio output switching circuit 87 is activated, and both the LCM audio output terminal 201 and the RCH audio output terminal 202 are set to LC.
+1, that is, it operates to automatically output the main audio of dual audio broadcasting. Recording and playback of HiFi audio signals are completely the same as conventional ones.

1. Effects of the invention] As described above, according to the magnetic recording and reproducing apparatus according to the present invention,
Two oscillator circuits are provided in the audio multiplex demodulation circuit section and generate two identification signals for obtaining audio multiplex broadcast display output, and the identification signals generated by the oscillation circuits are
a frequency band which is outside the frequency band of the low frequency converted color signal of the audio recording signal or the video signal and is recordable and reproducible; means for multiplex recording; and means for detecting the identification signal during reproduction; In the case of the means for performing the audio multiplex broadcast or stereo broadcast display using the output of the detection means, and the audio multiplex broadcast using the output of the detection means,
Since it is equipped with a means for giving priority to the main audio and outputting it from the audio output during playback, it is possible to instantly identify audio multiplex broadcasts such as stereo broadcasts or dual audio broadcasts during playback, and Originally, even though you could only listen to either the main audio or the sub audio, you had to operate the main audio and the sub audio. This has the effect of being switched to

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a magnetic recording/reproducing apparatus according to another embodiment of the invention, and FIG. 3 is a block diagram of a conventional example. Figure: Here, 1 is the antenna, 2 is the tuner, 3 is the VI
P, 4 video recording circuit, 5 to video recording (playback), C, 6
is SIF, 7 is MPX-DEC18 is HiFt audio circuit (recording system), 9 is linear audio circuit (recording system), IO is H
iFi audio recording (playback) head, 11 is a linear audio recording (playback) head, 41 is a luminance signal recording circuit, 42 is a color signal recording circuit, 43 is a color signal and identification additional signal mixing circuit, 4
5 is a luminance 1 sudden signal mixing recording amplifier, 49 is a video reproduction circuit, 51 is a luminance signal reproduction circuit, 52 is a color signal reproduction circuit, 7
1 is a stereo broadcast display device, 72 is a stereo broadcast identification additional signal generation circuit, 73 is a dual audio broadcast display device, 74 is a dual audio broadcast identification additional signal generation circuit, and 81 is a PNR-E.
, 82 is A・] MIX, 83 is FM-MOD, 84 is H
iFi audio circuit (playback system), 85 is FM-DEM, 86
is PNR-[), 87 is an audio output switching circuit, 91 is a linear audio circuit (reproduction system), 101 is a stereo broadcast identification filter circuit, 102 is a dual audio broadcast identification filter circuit, 201 is an LcI4 audio output terminal, 202 is the Rc audio output terminal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a magnetic recording and reproducing device for recording and reproducing stereo broadcasts and audio multiplex broadcasts, two oscillation circuits are provided in the audio multiplex demodulation circuit section and generate two identification signals for obtaining audio multiplex broadcast display outputs; means for multiplex-recording the identification signal generated by the oscillation circuit in a frequency band that is outside the frequency band of a high-fidelity audio recording signal or a low-frequency converted color signal of a video signal and that is recordable and reproducible; means for detecting the identification signal during playback; means for displaying the audio multiplex broadcast or stereo broadcast using the output of the detection means; 1. A magnetic recording and reproducing device characterized by comprising: means for giving priority to audio and outputting it from the audio output.