Muting circuit

DETAILED DESCRIPTION What is claimed is: 1.
In a receiver including carrier selection means for tuning to a selected signal and further including an information signal demodulator coupled to said carrier selection means and having a baseband output for supplying a demodulated signal to load means and a logic output for providing a logic output signal, said logic output signal being of a first type when said information signal is present and being of a second type when said information signal is absent, a signal processing arrangement comprising: low-pass filter means coupled to said logic output for providing a low-pass filtered logic signal corresponding to said logic output signal, said low-pass filter means including filter capacitance means for storing charge, wherein first and second levels of stored charge correspond to said filtered logic signal being of said first and second types, respectively; signal gate means having a control point coupled to said low-pass filter means, and being coupled between said baseband output and said load means for coupling said baseband signal to said load means when said filtered logic signal is of said first type and not coupling said baseband signal therebetween when said low-pass filtered logic signal is of said second type; and control means coupled to said filter capacitance means for selectively setting said stored charge to said second level.
2.
The arrangement recited in claim 1 wherein said control means is coupled to said carrier selection means for setting said stored charge to said second level when said carrier selection means is being tuned from a previously selected signal to a newly selected signal.
3.
The arrangement recited in claim 2 wherein said control means includes current supply means for varying said stored charge at a predetermined rate for setting to said second level.
4.
The arrangement recited in claim 3 wherein said filter capacitance means comprises a shunt capacitance and said current supply means comprises resistively coupled potential clamp means for selectively and controllably discharging said shunt capacitance to said second level of charge