AFC waveshaping circuit

Details AFC waveshaping circuit AFC waveshaping circuit

1977-09-09

1978-11-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325422, 325459, 334 16, H04N 550, H04B 116

Patent

active

041258630

ABSTRACT:
Automatic frequency control (AFC) circuitry compensating for the nonlinear tuning voltage sensitivity characteristics of voltage-controlled tuners is shown. The circuit uses a nonlinear device, such as a zener diode, to develop an amount of error correction voltage that increases with increasing tuning voltage. In addition, through the use of a VHF Bandswitch voltage, the circuit controls an impedance in a network that combines the tuning voltage with the voltage developed by the AFC system in response to tuning errors. As a result, a greater amount of AFC error correction voltage is developed on Low Band VHF channels than on High Band channels. In this manner, substantially constant AFC pull-in range is maintained both within and among High and Low Band VHF and UHF channels.

REFERENCES:
patent: 4005256 (1977-01-01), Arumugham

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