Noise activated mute for FM reception in an AM/FM radio receiver
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United States of America Patent
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-
Apr 1, 1986
Grant Date -
N/A
app pub date -
Mar 26, 1984
filing date -
Mar 26, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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