JPS617167U

JPS617167U - switch circuit

Info

Publication number: JPS617167U
Application number: JP9090484U
Authority: JP
Inventors: 義己縫村
Original assignee: 株式会社東芝
Priority date: 1984-06-20
Filing date: 1984-06-20
Publication date: 1986-01-17

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 the drawing]

第１図は本考案のスイッチ回路の一実施例を示す回路図
、第２図は本考案の他の実施例を示す回路図、第３図は
従来のスイッチ手段を用いた音声多重信号処理回路の概
略を示すブロック図、第４図は第３図の回路におけるモ
ード切換特性例を示す特性図である。２１・・・・・・音声多重信号復調用ＩＣ、２２・・・
・・・制御装置、Ｑ２・・・・・・トランジスタ、Ｒ５
，Ｒ６・・・・・・抵抗、Ｄエ，Ｄ２・・・・・・ダイ
オード。Fig. 1 is a circuit diagram showing one embodiment of the switch circuit of the present invention, Fig. 2 is a circuit diagram showing another embodiment of the invention, and Fig. 3 is an audio multiplex signal processing circuit using conventional switch means. FIG. 4 is a characteristic diagram showing an example of mode switching characteristics in the circuit of FIG. 3. 21... IC for audio multiplex signal demodulation, 22...
...Control device, Q2...Transistor, R5
, R6... Resistor, D, D2... Diode.

Claims

[Scope of utility model registration request]

(1) A first circuit that supplies an output having a voltage value of a first level or a second level, and a transistor having a collector connected to a first resistor and an emitter connected to a second resistor. The first and second resistors and the collector-emitter path of the transistor are connected in series between a voltage source and a reference potential point, and when the transistor is conductive, the potentials at the collector and emitter of the transistor are the same as the collector-emitter path of the transistor. a second circuit exhibiting a level between the first level and the second level; a third circuit controlling the base potential of the transistor to make the transistor conductive or non-conductive; unidirectional conducting elements connected in opposite directions between the output supply point of the first circuit and the collector of the transistor, and between the output supply point of the first circuit and the emitter of the transistor, respectively. , when the transistor is conductive, one of the unidirectional conductive elements is conductive according to the output level of the output supply point, and when the transistor is non-conductive, both unidirectional conductive elements are non-conductive. A switch circuit comprising a fourth circuit.

(2) The first circuit is a circuit that constitutes a part of a television audio multiplex broadcast receiver, and has a first level voltage value during stereo broadcasting and a second level voltage value during dual broadcasting. supplying an output having a voltage value of -level, when the transistor of the second circuit conducts;
The switch circuit according to claim 1, which is a utility model registered, characterized in that the switch circuit supplies an output determined by the potential of the collector or emitter of the transistor in place of the circuit output of the transistor, thereby switching to a monaural broadcasting mode. .