Fm stereo demodulator

Details Fm stereo demodulator Fm stereo demodulator

1988-09-13

1990-11-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 1, H04H 500

Patent

active

049724827

ABSTRACT:
Levels of a stereo sum signal and a stereo difference signal are detected by first and second level detectors (7, 9), respectively. Outputs of the first and second level detectors (7, 9) are compared with each other by a comparator (10). A voltage controlled amplifier (4) is responsive to an output of the comparator (10) for changing a level of the stereo difference signal, when a broadcasting signal including only either one of a left stereo signal and a right stereo signal is received, such that the levels of the stereo sums signal and the stereo difference signal are equal to each other.

REFERENCES:
patent: 4249038 (1981-02-01), Stienstra
patent: 4748669 (1988-05-01), Klayman

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