Adaptive wideband AFC system

Details Adaptive wideband AFC system Adaptive wideband AFC system

1977-09-16

1978-10-24

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

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

Patent

active

041224930

ABSTRACT:
Circuitry compensating for inherent nonlinearities in the tuning voltage sensitivity of varactor tuners, thereby providing relatively constant AFC pull-in range throughout the band of operating frequencies, is shown. In both the VHF and UHF bands, the AFC system develops an error correction voltage in proportion to the tuning voltage. With respect to reception of VHF channels, a gain switching circuit operates to reduce the proportion of AFC error correction voltage developed on a High Band VHF channel, thereby compensating for increased tuning voltage sensitivity on High Band VHF. With respect to reception of UHF channels, a tuning voltage sensing circuit operates to effect an error correction voltage that is a greater proportion of the tuning voltage when the tuning voltage is above a pre-determined value corresponding to approximately channel 60.

REFERENCES:
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 3959728 (1976-05-01), Yamazaki et al.
patent: 4005256 (1977-01-01), Arumugham

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