FM stereo demodulator

Details FM stereo demodulator FM stereo demodulator

1978-04-03

1979-09-04

Claffy, Kathleen H.

325492, 325483, H04H 500, H04B 110

Patent

active

041669258

ABSTRACT:
In an FM stereo demodulator, a detector circuit for detecting a low supply voltage is used. The detection level of this detector circuit is made substantially equal to a supply voltage value at the time when the oscillation frequency of an oscillator circuit for reproducing a subcarrier signal begins to change. The stereo reproduction of the demodulator is compulsorily switched to monaural reproduction by an output from the detector circuit. As a result, the generation of an abnormal sound which is attributed to the beat between the reproduced subcarrier signal having fluctuated and a subcarrier signal component of a received broadcast signal is prevented.

REFERENCES:
patent: 3916321 (1975-10-01), Morse
patent: 4091241 (1978-05-01), Sakaida

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