JPS5942513U

JPS5942513U - Switching noise prevention circuit for magnetic recording and reproducing equipment

Info

Publication number: JPS5942513U
Application number: JP13785682U
Authority: JP
Inventors: 豊越智
Original assignee: 三洋電機株式会社
Priority date: 1982-09-10
Filing date: 1982-09-10
Publication date: 1984-03-19

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図は従来回路の構成図、第２図は同回路の゛タイム
チャート図、第３図は本考案回路の１実施例の回路構成
図、第４図は同回路の要部のタイムチャート図である。主な図番の説明、１・・・・・・磁気ヘッド、２・・・
・・・入力手段、４．５・・・・・・第１、第２スイッ
チ回路、１１・・・・・・指令信号形成手段、１２・・
・・・・バイアス信号発生回路、１０・・・・・・制御
信号形成回路、１３・・・・・・付与回路、１４・・・
・・・解除回路、１５・・・・・・遅延回路。Figure 1 is a configuration diagram of a conventional circuit, Figure 2 is a time chart diagram of the same circuit, Figure 3 is a circuit diagram of an embodiment of the circuit of the present invention, and Figure 4 is a time chart of the main parts of the circuit. It is a diagram. Explanation of main figure numbers, 1...Magnetic head, 2...
...Input means, 4.5...First and second switch circuits, 11...Command signal forming means, 12...
...Bias signal generation circuit, 10...Control signal formation circuit, 13...Providing circuit, 14...
...Release circuit, 15...Delay circuit.

Claims

[Scope of utility model registration request]

a magnetic head for recording and reproducing audio signals; a means for inputting audio signals; and a first switch for inputting a reproduction output signal from the magnetic head and an audio signal from the input means and outputting one of the input signals. a circuit, and one of the magnetic heads.
a second switch circuit whose end is grounded in the recording mode; a command signal forming means for forming a recording command signal and a reproduction command signal; a bias signal generating circuit activated based on the recording command signal; and a bias signal generating circuit activated based on the output of the command signal forming means. means for creating a signal for controlling the first switch; and in a recording mode;
a circuit for applying the generating circuit output to the other end of the magnetic head together with the first switch circuit output; and in a recording mode;
a circuit that releases the connection of the application circuit to a ground point; and a circuit that delays the release operation of the release circuit for a time longer than the response delay time of the first and second switch circuits when switching from playback mode to recording mode. A switching noise prevention circuit for a recording/reproducing device comprising a circuit.