Squelch arrangement for AM/FM radio receiver

Details Squelch arrangement for AM/FM radio receiver Squelch arrangement for AM/FM radio receiver

1984-05-31

1986-08-19

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

455212, 455222, 455312, H04B 110

Patent

active

046073906

ABSTRACT:
A radio receiver has an IF amplifier whose output is connected to an AM demodulator and an FM demodulator. The noise level at the output of the FM demodulator is measured and, when it exceeds a predetermined threshold level, the audio output stage of the receiver is disconnected from the circuit. Noise generated when amplitude modulated signals with a high degree of modulation are received may cause unwanted disconnection of the output circuit. This is prevented by a circuit connected to the output of the AM demodulator which detects negative peaks of the modulation signal which exceed a negative threshold. The integrated peak signals form a correction signal which prevents disconnection of the output stage.

REFERENCES:
patent: 3728634 (1973-04-01), Watkinson
patent: 3745467 (1973-07-01), Lundquist et al.
patent: 3875514 (1975-04-01), Klein
patent: 3919645 (1975-11-01), Ohsawa et al.
patent: 4304004 (1981-12-01), Von Der Neyen

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