AM Quadrature stereo systems

Details AM Quadrature stereo systems AM Quadrature stereo systems

1982-08-23

1983-08-30

Pellinen, A. D.

H04H 500

Patent

active

044018533

ABSTRACT:
Compatible AM quadrature stereo systems generating a carrier amplitude modulated by the signal sum, predistorted to cancel distortion in an envelope detector in a receiver caused by quadrature sidebands, and angle modulated by a pilot and the signal difference. The receiver separates the amplitude and angle modulation of the carrier, and delivers the signals separately. The transmitting apparatus may have multiple modulation circuits with linear amplifiers, may be an unequalized AM mono transmitter with auxiliary angle modulation apparatus, or may be an equalized AM mono transmitter. The signal sum received by a mono receiver with an envelope detector is substantially free from distortion. Noise-reduction circuits may be used in the stereo receiver, which delivers the signals separately without distortion.

REFERENCES:
patent: 3122610 (1964-02-01), Csicsatka
patent: 4182932 (1980-01-01), Fisher et al.
patent: 4225751 (1980-09-01), Hershberger
patent: 4236042 (1980-11-01), Leitch

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