Automatic frequency control for local oscillator used with an AM

Details Automatic frequency control for local oscillator used with an AM Automatic frequency control for local oscillator used with an AM

1984-06-21

1986-04-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

331 17, 455262, H04H 500

Patent

active

045832447

ABSTRACT:
The AFC gain of the local oscillator of an AM stereophonic decoder is linearized by the use of difference channel (L-R) information for controlling the capacitance of two varactor-type devices coupled across and in series with the oscillator inductance coil. The improvement helps to prevent "falsing" of the pilot tone indicator and the mono/stereo mode circuitry, particularly at the ends of the tuning range of a manually tuned receiver.

REFERENCES:
patent: 4377728 (1983-03-01), Hilbert
patent: 4525686 (1985-06-01), Yokoya

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