JPS60142808U

JPS60142808U - Muting circuit

Info

Publication number: JPS60142808U
Application number: JP3080784U
Authority: JP
Inventors: 豊越智
Original assignee: 三洋電機株式会社
Priority date: 1984-03-02
Filing date: 1984-03-02
Publication date: 1985-09-21

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案実施例の回路ブロック図、第２図はＶＴ
Ｒのローディング状態を示す平面図、第３図は従来例を
示す回路ブロック図、第４図は第１図及び第３図におけ
る波形図である。主な符号の説明、Ｈ・・・・・・音声記録再生ヘッド、
・　８・・・・・・第１スイッチ手段、Ａ・・・・・・
制御信号、Ｂ・・・・・・ミュート信号、１４・・間第
２スイッチ手段、９・・・・・・バイアス発振器、Ｒ・
・−抵抗。Ｑ・・間第３スイッチ手段。Figure 1 is a circuit block diagram of an embodiment of the present invention, Figure 2 is a VT
FIG. 3 is a circuit block diagram showing a conventional example, and FIG. 4 is a waveform diagram in FIGS. 1 and 3. Explanation of main symbols: H...Audio recording/playback head;
・8...First switch means, A...
Control signal, B... Mute signal, 14... Second switch means, 9... Bias oscillator, R...
-Resistance. Q. Third switch means.

Claims

[Scope of utility model registration request]

An audio recording/reproducing head and one end of a coil of the head connected to an audio reproducing circuit are grounded in a first state, which is a recording state of a control signal specifying a recording state of the VTR.
a switch means to which the control signal is applied via a resistor and whose other end, which is connected to the audio recording circuit of the coil of the head, is grounded in a second state that is a state other than the recording state of the control signal; 2 switch means, means for generating a mute signal for a predetermined time at the start of recording, means for muting the audio recording circuit by the mute signal, and a first switch means connected to the other end of the coil of the head and for generating the control signal. a bias oscillator that starts oscillating in response to a state and stops oscillating in a second state; A third switch that sets the control signal to the second switch means to the second state while maintaining the control signal to the oscillator in the first state.
A muting circuit for a VTR audio recording and reproducing circuit, comprising a switch means.