FM stereophonic receiver

Details FM stereophonic receiver FM stereophonic receiver

1990-05-22

1992-08-04

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Quadrasonic

H04S 300

Patent

active

051366495

ABSTRACT:
An FM stereophonic receiver for receiving FM stereophonic broadcast signals, which includes a first comparison circuit for generating a first control signal corresponding to ratio of a left stereo signal (L) to a right stereo signal (R), a first separation circuit for separating the first control signal into a left dominant signal and a right dominant signal, a second comparison circuit for generating a second control signal corresponding to ratio of a stereo sum signal (L+R) to a stereo difference signal (L-R), a second separation circuit for separating the second control signal into a sum dominant signal and a difference dominant signal, a first level control circuit for controlling an output signal level of a stereo multiplex circuit through employment of the left and right dominant signals and the sum and difference dominant signals, a level detection device for detecting level of the second control signal, and a second level control circuit for controlling level of the difference dominant signal according to an output signal of the level detection device.

REFERENCES:
patent: 3772479 (1973-11-01), Hilbert
patent: 3959590 (1976-05-01), Scheiber
patent: 4162457 (1979-07-01), Grodinsky
patent: 4390749 (1983-06-01), Pearson
patent: 4941177 (1990-07-01), Mandell et al.

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