AM Stereo receivers

Details AM Stereo receivers AM Stereo receivers

1977-08-31

1980-11-04

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455265, H04R 504

Patent

active

042321891

ABSTRACT:
Radio receiver systems for recovering stereo program signals from a composite stereo signal which has been modulated with either quandrature modulation or modified quadrature modulation techniques. In one embodiment, a receiver is provided which directly recovers the program signals from the composite signal by means of product detectors, without first converting the composite signal into an IF signal. In another embodiment an IF stage is provided, but is designed to have broad bandpass characteristics. This embodiment additionally includes a phase locked loop for forcing the IF frequency into the center of the IF passband. In either case, the stereo demodulation is accomplished by product detectors which multiply the composite signal by phase reference signals. Several methods of synthesizing stable phase reference signals are shown.

REFERENCES:
patent: 3031529 (1962-04-01), Colodny
patent: 3043914 (1962-07-01), Collins, Jr.
patent: 3059189 (1962-10-01), Perisig
patent: 3109896 (1963-11-01), Boothroyd
patent: 3311833 (1967-03-01), Lewis
patent: 3944749 (1976-03-01), Kahn
patent: 4018994 (1977-04-01), Kahn
patent: 4037165 (1977-07-01), Ogita

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