Demodulator circuit in multiplex stereo and monophonic receiver

Details Demodulator circuit in multiplex stereo and monophonic receiver Demodulator circuit in multiplex stereo and monophonic receiver

1976-03-08

1977-07-12

Olms, Douglas W.

H04H 500

Patent

active

040355853

ABSTRACT:
An FM multiplex receiver comprises an averaging detection type demodulator circuitry. Two negative feedback paths lead from the L and R outputs of the switching circuit to the input of the amplifier, the output of which is connected to the input of the switching circuit. Output signals from the switching circuit are time-shared alternative ones in the stereophonic reception and continuous ones in the monophonic reception. The amplification factor observed during monophonic reception is substantially one half of that observed during stereophonic reception. With a very simple circuitry, the occurrence of undesired difference in sound levels is prevented between the monophonic listening and the stereophonic listening.

REFERENCES:
patent: RE28617 (1975-11-01), McShan
patent: 3301959 (1967-01-01), Jenkins
patent: 3662113 (1972-05-01), VON Recklinghausen
Electronic Circuits by E. J. Angelo, McGraw-Hill, 1958, p. 598.

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