Signal level detect circuits

专利名称：Signal level detect circuits发明人：Yoshio Shimizu申请号：US07/471598申请日：19900129公开号：US04973962A公开日：19901127

摘要：A signal level detecting circuit comprises an input terminal to which an inputsignal with level variations is applied, a level comparator operative to compare the levelof the input signal with the level of a reference signal variable in level and to produce acomparison output signal having first and second levels in response to differencesbetween the level of the input signal and the level of the reference signal, a controlsignal generator operative to produce control signals one of which is obtained when aperiod of time in which the comparison output signal has the first level is not longer thanone of two different reference periods of time and the other of which is obtained whenthe period of time in which the comparison output signal has the first level is not shorterthan the other of two different reference periods of time, a pulse generator operative toproduce a pulse signal having its pulse duty factor varied in response to the controlsignals obtained from the control signal generator, and an integrator operative toproduce an integration output signal based on the pulse signal obtained from the pulsegenerator and to supply the level comparator with the integration output signal as thereference signal.

申请人：SONY CORPORATION

代理机构：Hill, Van Santen, Steadman & Simpson

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