公开(公告)号：US3870958A

公开(公告)日：1975-03-11

申请号：US42368873

申请日：1973-12-11

Applicant: RCA CORP

Inventor： RYPINSKI CHANDOS ARTHUR ,  PERA JAIME ERNESTO

IPC: H04M11/06 ,  H04B1/02

CPC classification number: H04M11/066

Abstract: A circuit for coupling audio tone data signals from a source at the input end of a transmitter to which is also coupled a microphone includes a negative feedback amplifier characterized by a D.C. voltage at the output that remains close to that at the input.

Abstract translation: 用于耦合来自发射器输入端的源的音频音频数据信号的电路也耦合到麦克风，该电路还包括负反馈放大器，其特征在于输出处的直流电压保持接近于输入处的电压。