公开(公告)号：US3909727A

公开(公告)日：1975-09-30

申请号：US46249374

申请日：1974-04-19

Applicant: RCA CORP

Inventor： HUGHES CARROLL DUANE ,  PAINTER WALTER CHARLES ,  RYPINSKI CHANDOS ARTHUR

IPC: H03G3/00 ,  H03G3/34 ,  H04W88/02 ,  H04B1/10 ,  H04M11/00

CPC classification number: H04W88/027 ,  H03G3/005 ,  H03G3/34

Abstract: The suppression of speaker noise caused by data signaling in a mobile radio system is achieved by detecting the presence of a single audio tone frequency over a time period and when the presence of such a tone is detected causing muting of the speaker of the mobile radio receiver.

Abstract translation: 在移动无线电系统中由数据信令引起的扬声器噪声的抑制是通过在一段时间内检测单个音频音频的存在以及当检测到存在这样的音调导致移动无线电接收机的扬声器的静音而实现的 。

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。