Noise suppressing circuit in an FM tuner

Details Noise suppressing circuit in an FM tuner Noise suppressing circuit in an FM tuner

1991-03-29

1993-10-19

Peng, John K.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 7, 455212, 455222, 455223, H04H 500

Patent

active

052553191

ABSTRACT:
A noise suppressing circuit has a gate for controlling a composite signal applied to a stereo demodulator of an FM tuner, and a detector for detecting a noise included in the composite signal and for producing a noise dependent signal for controlling the gate to close it. A pilot signal detector is provided for detecting a pilot signal included in the composite signal for producing a pilot dependent pulses. In response to the noise dependent signal and to the pilot dependent pulses, gate control pulses are applied to the gate, thereby closing the gate in synchronism with the pilot signal.

REFERENCES:
patent: 4066845 (1978-01-01), Kishi
patent: 4314377 (1982-02-01), Kondo et al.
patent: 4419541 (1983-12-01), Kishi et al.

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