Sound system having suppression of AM stereophonic receiving cir

Details Sound system having suppression of AM stereophonic receiving cir Sound system having suppression of AM stereophonic receiving cir

1981-06-17

1984-08-28

Pellinen, A. D.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 94, H04H 500

Patent

active

044685378

ABSTRACT:
A multi-function sound system including an AM stereophonic receiving function in which interference with operating circuits in modes other than the AM stereophonic mode is eliminated. A limiter receives a IF AM stereophonic received signal and removes the amplitude variation components therefrom and couples the resulting signal to a phase detector composed of a phase-locked loop which produces as an output signal a sub-signal. A switch is provided which deactivates both the limiter and the voltage-controlled oscillator in the phase-locked loop circuit when the sound system is set to other than the AM stereophonic receiving mode.

REFERENCES:
patent: 3167614 (1965-01-01), Holt et al.
patent: 3296378 (1967-01-01), Fish et al.
patent: 3378773 (1968-04-01), Jeffers
patent: 3792199 (1974-02-01), Saeki
patent: 4030036 (1977-06-01), Kusano
patent: 4215316 (1980-07-01), Yamaguchi et al.

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