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2. 发明授权

US5392456A Method of controlling filter time constant and filter circuit having the time constant control function based on the method 失效
标题翻译：基于该方法控制滤波时间常数的方法和具有时间常数控制功能的滤波电路
公开(公告)号：US5392456A
公开(公告)日：1995-02-21
申请号：US592340
申请日：1990-10-03
申请人： Isamu Mitomo , Nobuo Tsukamoto , Arata Nakagoshi , Jiroh Sakaguchi , Kazuo Yamakido , Hiroshi Noguchi , Atushi Hoshi
发明人： Isamu Mitomo , Nobuo Tsukamoto , Arata Nakagoshi , Jiroh Sakaguchi , Kazuo Yamakido , Hiroshi Noguchi , Atushi Hoshi
IPC分类号： H03H11/04 , H03H11/12 , H04B7/26 , H04B1/10
CPC分类号： H03H11/1291
摘要： A method of controlling the time constant of a filter for use in a radio receiver which receives a signal, transmitted from a transmitting station at a predetermined period, intermittently at the predetermined period and demodulates and delivers the received signal, a filter circuit having the time constant control function based on the method, and a radio receiver having the filter circuit. Preferably, the filter has its time constant switchable stepwise and specifically, parallel connection of capacitors or shortcircuiting of resistors is controlled by turning on/off switches. A controller within the filter circuit or the radio receiver performs control for applying a predetermined periodical signal (or standard pulse signal) to the filter and controlling the time constant of the filter in accordance with an output signal (or triangular pulse) during a first time zone within each operation interval for the intermittent reception and for filtering the signal from the transmitting station and causing a demodulating circuit to demodulate and deliver a filtered signal.
摘要翻译：一种控制无线电接收机中使用的滤波器的时间常数的方法，该无线电接收机接收以预定周期从发送站以预定周期间歇地发送的信号，并且对接收到的信号进行解调和传送，具有时间基于该方法的恒定控制功能和具有滤波器电路的无线电接收机。优选地，该滤波器的时间常数可逐步切换，具体地说，通过接通/断开开关来控制电容器的并联或电阻的短路。滤波器电路或无线电接收机内的控制器执行用于将预定周期信号（或标准脉冲信号）施加到滤波器的控制，并且在第一时间内根据输出信号（或三角波脉冲）控制滤波器的时间常数在间歇接收的每个操作间隔内，对来自发送站的信号进行滤波，并使解调电路解调并传送滤波信号。

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