Noise activated mute for FM reception in an AM/FM radio receiver

Details Noise activated mute for FM reception in an AM/FM radio receiver Noise activated mute for FM reception in an AM/FM radio receiver

1984-03-26

1986-04-01

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455194, 455212, 455222, 455200, H03J 718, H04B 110

Patent

active

045802866

ABSTRACT:
In an integrated AM-FM radio circuit connected for operation in the FM mode, the voltage appearing across the normally unused AM tank at the IF amplifier is noise in that AM band centered at 455 KHz. That noise, which is present only when the IF amplifier is not limiting due to the presence of an FM signal therein, is used for muting the receiver. The noise is passed through a simple IC-on-board low pass filter to a noise detector and then to a voltage controlled attenuator to attenuate the demodulated audio from the FM detector to the audio amplifier.

REFERENCES:
patent: 3626294 (1972-12-01), Dancy
patent: 3628046 (1971-12-01), Bilotti
patent: 4107613 (1978-08-01), Queen et al.
patent: 4330866 (1982-05-01), Malchow
patent: 4397040 (1983-08-01), Jandel et al.
"Advanced FM-IF" by Wile, 6/11/82, IEEE Transactions on Consumer Electronics, vol. CE-28, No. 3, pp. 383-392.

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