Signal distributing and muting system for multiple channel FM st

Details Signal distributing and muting system for multiple channel FM st Signal distributing and muting system for multiple channel FM st

1976-12-29

1977-11-01

Olms, Douglas W.

1791001TD, H04H 500

Patent

active

040566854

ABSTRACT:
A signal distributing and muting system for a four-channel stereo receiver comprises a source of composite baseband signal, a source of bias potential and a plurality of differential amplifier type demodulators for developing a like plurality of audio difference components. The system includes a composite signal distributor having a first output terminal for applying composite signal to one of the demodulators and a second output terminal for applying composite signal for the remaining ones of the demodulators. A bias potential distributor has a first output terminal for applying operating bias to one demodulator and a second output terminal for applying operating bias to the remaining ones of the demodulators. A control signal is provided which has a first amplitude indicative of detection by the receiver of a four-channel pilot signal and a second different amplitude indicative of failure to detect such a pilot signal. A switch coupled to the second output terminals of the composite signal and bias potential distributors responds to a control signal of said first amplitude to render the remaining demodulators operative. In response to a control signal of a different amplitude the switch renders the remaining demodulators quiescent while simultaneously controlling the bias applied to these demodulators so that the power consumed by their differential amplifiers during the quiescent condition remain substantially the same as the power consumed during the operative condition.

REFERENCES:
patent: 3934092 (1976-01-01), Csicsatka
patent: 3944747 (1976-03-01), Eilers
patent: 3965302 (1976-06-01), Kurata
patent: 4016366 (1977-04-01), Kurata

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