JPS60147904A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record simultaneously a different sound signal to an FM sound circuit and a linear sound circuit through automatic discrimination by providing a sub-sound connection line and a switching circuit activated only by a duplex sound signal between an 8mm. video tape recorder and a sound multiplex TV tuner. CONSTITUTION:An output of a main sound signal 5 of a sound multiplex TV tuner 3 and an input of an FM sound circuit 1 of an 8mm. video tape recorder are connected directly. Furthermore, the switching circuit 9 is provided between the output of a sub- sound signal 6 and the linear sound circuit 2 of the 8mm. video tape recorder so that the sub-sound signal 6 is inputted to the linear sound circuit 2 at the reception of duplex sound and the main sound signal 5 is inputted at the reception of normal sound. When the TV tuner 3 receives a signal other than the duplex sound signal, since the duplex sound signal is not detected by a duplex sound control signal detecting circuit 4, the switching circuit 9 is thrown to the position (a) and a normal sound signal from an output terminal of the sound signal 5 of the tuner 3 is inputted and recorded to the FM sound circuit and the linear sound circuit 2 of the 8mm. video camera. The normal sound signal of the FM sound circuit 1 and the linear sound circuit 2 is selected at reproduction.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing device, and particularly has a two-system monaural audio circuit, and is capable of recording and reproducing audio multiplexed (1) dual audio broadcasts from Chi-Chi. The present invention relates to a magnetic recording and reproducing device suitable for

[Background of the invention]

FIG. 1 is a block diagram of an 8-video tape recorder (hereinafter referred to as 8-video tape recorder) in a known magnetic recording/reproducing device. In the figure, 1 is an audio multiplexing F that records and reproduces audio on a video track using a video head in B'Mi tone.
2 is a circuit of the M recording method (hereinafter abbreviated as FM audio), and 2 is a circuit of a method (hereinafter abbreviated as linear audio) for recording and reproducing on a dedicated track using a dedicated head, which is a conventional audio circuit for post-recording. The octagonal video consists of two systems: an audio circuit and a linear audio circuit. When recording the audio of the two-wheeled audio broadcast using the audio multiplex television tuner 6 in this 8rMn video, the audio carrier wave from the tuner 3 is detected by the dual audio control signal detection circuit 4 when the dual audio broadcasting control signal is detected. The demodulation mode of the audio carrier wave 3 is switched, and the main audio signal 5 and the sub audio signal 6 are output from the tuner 6. Further, a double voice display 8 is performed in response to a command signal from the control signal detection circuit 4. From this display, the changeover switch 7 is used to select only one of the main audio signal 5 and the sub audio signal 6 for recording. That is, the main audio signal 5
Alternatively, only one of the sub-audio signals 6 can be recorded and reproduced, and even if the user wants to listen to the other audio later, it is impossible because the other audio is not recorded.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus which can eliminate the above-mentioned drawbacks and simultaneously record and reproduce a main audio signal and a sub audio signal when receiving a dual audio signal.

[Summary of the invention]

The feature of the present invention is that 81III11 video and audio multiplex TV
blood .

-- A sub-audio connection and a switching circuit that works only on the dual audio signal are provided between the two audio signals, and different audio signals can be simultaneously recorded in the m-audio circuit and the linear audio circuit by automatic discrimination. In this way, the main audio signal or the sub audio signal can be output by switching between the kite audio signal and the linear audio signal during playback of the 8-bit video.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. Second
The figure is a block diagram showing one embodiment of the magnetic recording/reproducing circuit according to the present invention, and the same parts as in FIG. In Fig. 2, the points that are true to Fig. 1 are that the main audio signal 5 output of the audio multiplex TV tuner 3 and the FM audio circuit 10 input of the 8m video are directly connected, and the sub audio signal 6 output and the 8m video FM audio circuit 10 are directly connected. +j
When the double voice signal is busy between the near voice circuit 20, the sub voice signal 6 is sent.
However, a switching circuit 9 is provided so that the main audio signal 5 can be input manually to the linear audio circuit 2 during normal audio reception.

In the present invention, when the audio multiplex TV tuner 3 receives a signal other than a dual audio signal, the dual audio control signal detection circuit 4
Since the dual voice control signal is not detected, the switching circuit 9
is on side a, and the normal audio signal from the output end of the main audio signal 5 of the tuner 3 is input to the FM audio circuit 1 and linear audio circuit 2 of the 8N video and can be recorded.

At the time of reproduction, it is possible to select the normal audio signals of the VII voice circuit 1 and the linear audio circuit 20.

When the audio multiplex TV tuner 3 receives a dual audio signal, the dual audio control signal detection circuit 4 detects the dual audio control signal, and the tuner 5 uses the main audio signal 5 and the sub audio signal based on this control signal. Outputs signal 6. Further, the control signal displays the dual audio signal display 8 and operates the switching circuit 9 to perform bllllK switching. tuner 5
The main audio signal 5 is input to the FM audio circuit 1 of the 8-video, and the sub-audio signal 6 is manually input to the linear audio circuit 2 of the 8-video via a switching circuit 9, and each signal is recorded simultaneously. be able to. During playback, if the 11M audio circuit 1 is selected, the main audio signal 5 can be output, and if the 1J near audio circuit 2 is selected, the sub audio signal 6 can be output.

In the embodiment shown in FIG. 2, the m audio circuit 1 may be connected to the switching circuit 9 and the linear audio circuit 2 may be connected to the main audio signal 5. Furthermore, the changeover switch 9 may be connected between the main audio signal 5 and the m audio circuit 1.

〔Effect of the invention〕

As described above, according to the present invention, dual audio carrier waves can be selected in an 8.8 video tape recorder, and main audio signals and sub audio signals can be simultaneously recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional magnetic recording/reproducing apparatus, and FIG. 2 is a block diagram showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention. 1...m audio circuit 2...linear audio circuit 6...audio multiplex W-tainer 4...double audio control signal detection circuit 7.9...changeover switch 8...double audio display 9 ...switching circuit

Claims (1)

[Claims] 1. In a video tape recorder that has two types of monaural audio circuits, an FM audio circuit and a linear audio circuit, the dual audio signal of the audio multiplex TV tuner is automatically determined, and one audio circuit is used as the main audio signal, and the other audio Recording is done by simultaneously inputting the sub-audio signal to the circuit, and during playback,
A magnetic recording/reproducing device characterized in that it is possible to listen to a main audio signal or a sub audio signal arbitrarily by selecting a PX audio circuit or a linear audio circuit.