FM signal processor

Details FM signal processor FM signal processor

1994-11-10

1997-02-18

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

331 20, 331 25, 329323, H04H 500

Patent

active

056048084

ABSTRACT:
An FM signal phase-shifted by 90.degree. and an FM signal not phase-shifted are supplied to a multiplier to demodulate a stereo composite signal. A 90.degree. phase shifting circuit has a first oscillation circuit whose phase shift amount varies according to a timing at which the amount of a current flowing through a charging and discharging capacitor is changed. A multiplexer is provided to process the stereo composite signal to output left and right channel signals. The multiplexer has a second oscillation circuit for generating a signal multiplied by the stereo composite signal to extract the left and right channel signals from the composite signal. The first and second oscillation circuits each have a differential amplifier. The constant current of the constant current source of each differential amplifier is set by trimming-regulate it by a regulating circuit.

REFERENCES:
patent: 4631499 (1986-12-01), Kasperkovitz
patent: 4817167 (1989-03-01), Gassmann
patent: 5038115 (1991-08-01), Myers et al.
patent: 5257312 (1993-10-01), Therssen et al.
patent: 5293135 (1994-03-01), McGinn
patent: 5341107 (1994-08-01), Bijker et al.
patent: 5357544 (1994-10-01), Horner et al.
patent: 5440586 (1995-08-01), Den Braber
patent: 5493713 (1996-02-01), Horsfall et al.

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