Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1983-05-31
1985-03-12
Brown, Thomas W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
045049661
ABSTRACT:
An AM stereo demodulator having monophonic and stereophonic modes of operation and adapted to demodulate a QAM signal whose quadrature-phase signal has a low frequency slot containing substantially no information signal therein. The demodulator includes a low-pass filter for filtering the quadrature-phase signal so as to provide a filtered signal containing only signals in the low frequency slot of the quadrature-phase signal. A window comparator compares the amplitude of the filtered signal with two threshold levels and provides a first output signal when the filtered signal is outside of the range bounded by the threshold levels. A circuit is included for placing the AM stereo demodulator in the monophonic mode of operation in response to the first output signal.
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Brady W. J.
Brown Thomas W.
Harris Corporation
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