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公开(公告)号：US5138277A
公开(公告)日：1992-08-11
申请号：US589239
申请日：1990-09-28
IPC分类号： H03G3/20
CPC分类号： H03G3/30 , H03G3/3036
摘要： A switched capacitor integrator is used within the feedback loop of an automatic gain control (AGC) circuit to provide a very long time constant (5 minutes or more) when the amplitude of the gain-controlled signal is within predetermined limits. The time constant is automatically and quickly changed to a much shorter value when the gain-controlled signal is outside the predetermined limits, thereby allowing the AGC circuit to rapidly bring the gain-controlled signal amplitude within the desired range between the predetermined limits. Time constants of orders of magnitude longer than those readily realized with prior art methods of long time-constant filtering are achieved.
摘要翻译： 当自动增益控制（AGC）电路的反馈回路中使用开关电容积分器，以在增益控制信号的幅度在预定限度内时提供非常长的时间常数（5分钟或更长）。 当增益控制信号超出预定极限时，时间常数自动快速地变化到更短的值，从而允许AGC电路将增益控制的信号振幅迅速地提高到预定极限之间的期望范围内。 实现了比用现有技术的长时间常数滤波方法容易实现的时间常数的数量级。
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公开(公告)号：US4872145A
公开(公告)日：1989-10-03
申请号：US45929
申请日：1987-05-04
申请人： James A. Culbert , Daniel M. Seslar
发明人： James A. Culbert , Daniel M. Seslar
CPC分类号： H03K5/08 , G01S7/527 , H03H11/04 , Y10S367/901
摘要： A noise trap circuit particularly suitable for use in an electro-acoustic system, operates to suppress low level signals or noise while allowing a relatively large signal to pass unattenuated between input and output terminals of the circuit. Blocking elements between the input and output terminals establish a high impedance path to the noise but switch to a conductive state when the large signals are present at the input terminals. Shunt elements across the output terminals provide a low resistance path or "crowbar" when only the noise is present at the input terminals, but switch to a non-conductive state when the large signals are sensed at the circuit input.
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