MPX stereo signal demodulator

Details MPX stereo signal demodulator MPX stereo signal demodulator

1976-10-08

1977-09-20

Olms, Douglas W.

H04H 500

Patent

active

040499189

ABSTRACT:
A multiplex (MPX) stereo signal demodulator includes a first differential amplifier supplied with a composite stereo signal and second, third differential amplifiers cascode-connected to the first differential amplifier and supplied with a 38 KHz subcarrier signal so as to obtain, by demodulation, a pair of audio signals as the multiplying results of the composite and subcarrier signals. A fourth differential amplifier supplied with the composite stereo signal, the input level of which is adjustable, is provided and the output signal therefrom is mixed with the pair of audio signals through a current mirror circuit so as to compensate the separation ratio therebetween.

REFERENCES:
patent: 3573382 (1971-04-01), Feit
patent: 3842211 (1974-10-01), Metro
patent: 3947645 (1976-03-01), Mizukami et al.

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