Muting circuit for AM stereophonic receiver

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo

Patent

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Details

455212, 455222, H04H 500

Patent

active

044908385

ABSTRACT:
A muting circuit for an AM stereophonic receiver of the type that having a detector circuit operating upon an AM stereophonic signal, the carrier of which is phase-modulated by the difference signal of first and second stereo channel signals, for detecting the difference signal. The muting circuit includes a muting signal generating circuit for detecting the output level of the detector circuit exceeding a predetermined value and for generating a muting signal at least for periods when the predetermined value is exceeded, and a muting switch circuit for attenuating the output of the detector in response to the muting signal.

REFERENCES:
patent: 3716726 (1973-02-01), Trimble
patent: 4038604 (1977-07-01), Koerber
patent: 4150339 (1979-04-01), Sueyoshi et al.
patent: 4159396 (1979-06-01), Hilbert et al.
patent: 4178552 (1979-12-01), Amazawa et al.
patent: 4245348 (1981-01-01), Imazeki
patent: 4292552 (1981-09-01), Tanaka
patent: 4326297 (1982-04-01), Sato et al.

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