Variable threshold circuit for multifrequency signal receiver
专利汇可以提供Variable threshold circuit for multifrequency signal receiver专利检索，专利查询，专利分析的服务。并且PURPOSE:To detect a minimum input signal continuation time accurately for optional echo signal length and pause time between signal digits, by adding a detecting function for the leading edge of a signal digit to a conventional variable threshold type circuit. CONSTITUTION:A multifrequency signal is inputted to one output of a group L or H through a band-pass filter. One input signal is inputted to a comparing circuit CMP through a fixed threshold circuit Fth, and the other is supplied to the comparing circuit CMP through a rectifying circuit Vth, a switch, and a level holding cirucit LHD; and the output of the comparing circuit CMP is supplied to a rectifying circuit REC with a prescribed time constant. The output of the rectifying circuit REC opens a gate together with a voice guarding signal and at the trailing edge of the REC output, a flip-flop F/F is set to turn off a switch SW by the set output and also to drive a monostable multivibrator MM, thereby putting an echo eliminating circuit in operation. The output of the monostable multivibrator MM is used to reset the F/F.，下面是Variable threshold circuit for multifrequency signal receiver专利的具体信息内容。
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