Frequency-modulation stereophonic receiver

Details Frequency-modulation stereophonic receiver Frequency-modulation stereophonic receiver

1979-07-23

1981-02-17

Olms, Douglas W.

H04H 500

Patent

active

042516900

ABSTRACT:
A control circuit of an FM stereophonic receiver includes two sets of symmetrically arranged transistor pairs which form a DC supply regulating circuit therein and are connected to respective constant current sources. The control circuit receives an output signal from an FM detector and controls the coupling of the FM detector output to different input terminals of a switching circuit of the FM demodulator in response to a DC control signal indicative of the level of a received broadcast signal. The switching circuit receives a train of switching pulses of 38 kHz as a switching signal to derive a stereophonic or monophonic audio signal from the controllably applied FM detector output. The DC supply regulating circuit serves to maintain the DC level applied to the input terminals of the switching circuit at a constant value at all times to reduce noise which might occur in the reproduced audio signal when the receiver is switched over between the stereophonic and monophonic modes.

REFERENCES:
patent: 4194087 (1980-03-01), Sakaida
patent: 4198543 (1980-04-01), Schertz et al.

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