Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1983-06-24
1985-05-28
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
332 23A, 332 37D, 332 40, H04H 500
Patent
active
045204985
ABSTRACT:
An AM stereo modulator is disclosed which includes a limiter responsive to first and second audio signals for providing first and second equally limited amplitude limited signals. A quadrature amplitude modulator responds to the first and second amplitude limited signals and provides an amplitude modulated carrier signal having in-phase and quadrature-phase components modulated in accordance with the first and second amplitude limited signals, respectively. A distortion detector monitors the envelope of the quadrature amplitude modulated signal for detecting the extent to which the envelope differs from one of the two amplitude limited signals and for controlling the limiter in accordance with the extent of the difference. The distortion detector can also be used to control quadrature channel signal gain instead of the limiter. A program analyzer determines whether to control quadrature channel signal gain or the limiter with the distortion detector.
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Brady W. J.
Harris Corporation
Rubinson Gene Z.
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