JPS6129562U

JPS6129562U - Crosstalk prevention circuit

Info

Publication number: JPS6129562U
Application number: JP11352284U
Authority: JP
Inventors: 智竹森
Original assignee: 株式会社日立製作所
Priority date: 1984-07-27
Filing date: 1984-07-27
Publication date: 1986-02-22

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区は現在の可聴信号音ＢＴの送出回路図、第２図は
話中音の信号説明図、第３図はＳＶ−バリスタの特性線
図、第４図は本発明の一実施例の可聴信号音ＢＴの送出
回路図である。ＳＵＢ−ｏｚｍ”・加入者、Ｎｏ’．ｏ〜ｍＴＲＫ
ｌ−通話回路を構成するトランク、Ａ・・・加入者の
監視およ′び通話電流供給リレー、ｂｔ・・・話中音送
出リレー接点。The first section is a sending circuit diagram of the current audible signal tone BT, the second figure is a signal explanation diagram of the busy tone, the third figure is a characteristic diagram of the SV-varistor, and the fourth figure is an example of an embodiment of the present invention. FIG. 3 is a circuit diagram for transmitting an audible signal tone BT. SUB-ozm"・Subscriber, No'. o ~mTRK
1-Trunk constituting a telephone call circuit; A...Subscriber monitoring and communication current supply relay; bt...Busy tone sending relay contact;

Claims

[Scope of utility model registration request]

An audible signal tone is induced from the third winding of the relay circuit that monitors the calling subscriber and the called subscriber in the trunk that constitutes the telephone exchange circuit and supplies the telephone call current to the first and second windings to make a telephone call. In the audible signal tone sending circuit that sends out the relay from the circuit to the subscriber, a nonlinear element is inserted in series with the third winding of the relay circuit, so that the audible signal tone is sent to the communication circuit, but the voice signal from the subscriber is not. A crosstalk prevention circuit characterized by being configured to prevent crosstalk using a constant voltage element.