Stereophonic receiving circuit providing improved switching char

Details Stereophonic receiving circuit providing improved switching char Stereophonic receiving circuit providing improved switching char

1985-06-11

1987-09-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, 455246, H04H 500

Patent

active

046913572

ABSTRACT:
A stereophonic receiving circuit in which automatic switchover from the monaural receiving mode to the stereophonic receiving mode as the input signal strength increases is made more smoothly and effectively by boosting the gradient of a S-meter control voltage above a certain level of the received signal. The conventional S-meter voltage is applied to one input of a differential amplifier, the other input of which receives a reference voltage. The output of the differential amplifier is applied to one input of an analog OR gate, the other input of which receives the S-meter voltage directly. The output of the analog OR circuit, which is the greater of the two inputs to the circuit, is applied to the control inputs of an electronic volume control circuit, a high-cut controller, and a stereophonic demultiplexer circuit.

REFERENCES:
patent: 4063039 (1977-12-01), Endres et al.
patent: 4620315 (1986-10-01), Imagawa
Data Sheet for CA3089 (RCA Integrated Circuits Catalog) 1976.

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