AM stereo demodulator

Details AM stereo demodulator AM stereo demodulator

1985-10-03

1987-03-03

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

329112, 329124, 329137, H04H 500

Patent

active

046481141

ABSTRACT:
An AM stereo demodulator with which the transition from the stereo receiving mode to the monaural receiving mode upon a reduction in the field strength of the received signal is made gradual so as to eliminate an abrupt change in the sound quality. For stereo demodulation, a pair of reference signals are generated which are .pi./2 different in phase for stereo reception. As the field strength of the received signal approaches the level where a phase-locked loop in the demodulator would become unlocked from the carrier of the received signal, the phase difference between the two reference signals is gradually reduced to .pi./4.

REFERENCES:
patent: 4232189 (1980-11-01), Leitch
patent: 4339631 (1982-07-01), Nishioka
patent: 4349696 (1982-09-01), Akitake et al.
patent: 4358638 (1982-11-01), Numata et al.
patent: 4375580 (1983-03-01), Sauer
patent: 4536885 (1985-08-01), Loughlin

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