公开(公告)号：KR810000065B1

公开(公告)日：1981-02-04

申请号：KR770000090

申请日：1977-01-17

Applicant: MOTOROLA INC

Inventor： ANDREWS J ,  BETHARDS C

IPC: H04B1/40

Abstract: A compression amplifier processes both the audio modulating signal to the transmitter, and the audio output from the receiver, in a conventional amplitude modulated transceiver. Unique switching circuitry provides isolation between transmitter and receiver inputs to, and outputs from, the compression amplifier.

公开(公告)号：KR810001859B1

公开(公告)日：1981-11-17

申请号：KR770000581

申请日：1977-03-11

Applicant: MOTOROLA INC

Inventor： RAE J ,  ANDREWS J

IPC: H04B1/10

Abstract: The blanking cct. (10) includes a filter(32) which attenuates signals in the selected information passband of the receiver, and a sampling passband is chosen which contains the same noise signals that are found in the information passband. The filter is coupled to the portion of the receiver which receives radio signals prior to the circuitry which selects the information passband of frequencies. The signals passed by the filter are processed to generate blanking signals in response to the filtered signals.

公开(公告)号：US3750032A

公开(公告)日：1973-07-31

申请号：US3750032D

申请日：1972-02-24

Applicant: MOTOROLA INC

Inventor： ANDREWS J

IPC: H03G3/34 ,  H03J7/18 ,  H04B1/36

CPC classification number: H03J7/18 ,  H03G3/34

Abstract: A channel scanning and priority channel monitoring system for a multi-channel receiver includes a high frequency clock and a sequencing switch to rapidly scan the channels for signals and a low frequency clock and sampling switch to periodically monitor the priority channel for short time intervals during the reception of a non-priority signal. A variable response time squelch circuit is used to control the operation of the clocks. The squelch circuit operates in a fast response mode to rapidly sense the presence of a signal. After a signal has been acquired, the response time of the squelch circuit is determined by the strength of the signal being received, the squelch circuit operating in conjunction with a delay circuit to prevent the resumption of scanning during signal fades. A noise generator controlled by the variable response time squelch controls an audio muting squelch circuit in the receiver.

Abstract translation: 用于多通道接收机的信道扫描和优先级信道监测系统包括：高频时钟和顺序开关，用于快速扫描信道的信道;以及低频时钟和采样开关，以在短时间间隔周期性地监视优先级信道 接收非优先信号。 可变响应时间静噪电路用于控制时钟的工作。 静噪电路以快速响应模式工作，以快速感测信号的存在。 在获取信号之后，静噪电路的响应时间由所接收信号的强度决定，静噪电路与延迟电路一起工作，以防止在信号衰落期间恢复扫描。 由可变响应时间静噪控制的噪声发生器控制接收机中的音频静噪静噪电路。

公开(公告)号：BR7701665A

公开(公告)日：1978-01-24

申请号：BR7701665

申请日：1977-03-18

Applicant: MOTOROLA INC

Inventor： BETHARDS C ,  ANDREWS J

IPC: H04B1/40 ,  A42B1/04 ,  G11B20/04 ,  H04B1/44 ,  H04B1/64 ,  H04B1/38