FM stereo multiplex demodulator

Details FM stereo multiplex demodulator FM stereo multiplex demodulator

1984-06-07

1986-03-25

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

329123, 329167, 455214, H04H 500

Patent

active

045788073

ABSTRACT:
A composite FM stereo multiplex signal is demodulated using a double-balanced switching circuit cooperating with current mirror circuits so that demodulation and separation of the multiplexed signals occurs in the current domain. The switching circuit receives a switching signal that is a sub-carrier frequency of the FM stereo multiplex carrier signal, and the switching circuit is provided with the composite stereo signal as a output current signal from a first current mirror circuit. Outputs from the switching circuit are then fed to respective left and right channel current mirror circuits where the current output signals therefrom are substracted in respective current difference circuits from the composite current output signal produced by the first current mirror circuit, thereby producing left and right channel stereo signals having predetermined separation and signal-to-noise ratio.

REFERENCES:
patent: 4049918 (1977-09-01), Ohsawa
patent: 4054839 (1977-10-01), Ohsawa
patent: 4074075 (1978-02-01), Ohsawa
patent: 4115663 (1978-09-01), De Weger
patent: 4140878 (1979-02-01), Ohsawa
patent: 4167649 (1979-09-01), Ohsawa et al.
patent: 4390746 (1983-06-01), Higashiyama et al.

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