Predictive distortion reduction in am stereo transmitters

Details Predictive distortion reduction in am stereo transmitters Predictive distortion reduction in am stereo transmitters

H - Electricity

04

H

325/48

H04H 5/00 (2006.01)

Patent

CA 1182528

PREDICTIVE DISTORTION REDUCTION IN AM STEREO TRANSMITTERS ABSTRACT OF THE INVENTION An apparatus for generating a composite AM stereo broadcast signal wherein a carrier is angle modulated with stereo difference information contained in a first supplied signal and the angle-modulated carrier is then amplitude modulated with stereo sum information contained in a second supplied signal, an improvement wherein distortion is predicted by the use of a simulated transmitter and receiver to generate a correction signal having distortion representative components. Correction signals developed in this manner are used to modify the angle-modulating signal utilizing a feedback technique, a subtractive technique, or both, thereby reducing distortion in the output of the stereo difference signal channel of actual AM stereo receivers which receive said composite AM stereo signal.

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