Noise eliminator for radio receiver
First Claim
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1. A noise eliminator for a radio receiver, comprising:
- first circuit means coupled to a signal path leading from a front end circuit to a demodulator circuit in the receiver and including a filter circuit for deriving a noise signal contained in a signal on said signal path;
second circuit means receiving said noise signal for averaging the same to produce an average signal;
third circuit means for producing a differential signal corresponding to a difference between said noise signal and said average signal;
gating means inserted between said demodulator circuit and an output terminal of the receiver for interrupting a transmission of a demodulated output signal to said output terminal when said gating means is nonconductive; and
fourth circuit means responsive to said differential signal for rendering said gating means nonconductive.
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Abstract
A noise eliminator for a radio receiver comprises an automatic gain control amplifier for amplifying a noise signal extracted from an intermediate-frequency signal or a detector output signal of the receiver, a circuit for producing a faithfully pulsating noise signal and an average noise signal from the output of the amplifier circuit, an operational circuit for detecting an impulse noise component through a comparative operation of the pulsating noise signal and the average noise signal, and a gate circuit for controlling a signal transmission in the receiver in accordance with the detected impulse noise component.
14 Citations
12 Claims
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1. A noise eliminator for a radio receiver, comprising:
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first circuit means coupled to a signal path leading from a front end circuit to a demodulator circuit in the receiver and including a filter circuit for deriving a noise signal contained in a signal on said signal path; second circuit means receiving said noise signal for averaging the same to produce an average signal; third circuit means for producing a differential signal corresponding to a difference between said noise signal and said average signal; gating means inserted between said demodulator circuit and an output terminal of the receiver for interrupting a transmission of a demodulated output signal to said output terminal when said gating means is nonconductive; and fourth circuit means responsive to said differential signal for rendering said gating means nonconductive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification