Automatic frequency control for digital tuning systems

Details Automatic frequency control for digital tuning systems Automatic frequency control for digital tuning systems

1976-08-12

1978-10-31

Griffin, Robert L.

325423, 325470, H04B 106

Patent

active

041237161

ABSTRACT:
Apparatus is provided for automatically compensating for frequency drift in a digitally tuned varactor tuner. An Automatic Frequency Control signal for tuning the varactor tuner is produced in response to the direction of a tuning error. A signal level detector is used to inhibit the AFC signal when weak signals are being tuned by the varactor tuner thereby preventing continuous searching by the tuning system.

REFERENCES:
patent: 2976411 (1961-03-01), Kahn
patent: 3492584 (1970-01-01), Takahashi
patent: 3806826 (1974-04-01), Schlosser
patent: 3845393 (1974-10-01), Basset
patent: 3863156 (1975-01-01), Bogert
patent: 3936753 (1976-02-01), Clark
patent: 3949158 (1976-04-01), Rzeszewski et al.
patent: 3988681 (1976-10-01), Schurmann
patent: 4004231 (1977-01-01), Elshuber et al.
"An Automatic-Freq.-Control System For High-Freq. Radio Receivers" by Reynolds, Post Office Electrical Engineers' Journal, vol. 67, pt.2, pp. 115-117, Jul. 1974.

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