Digitally controlled tuner with automatic fine tuning

Details Digitally controlled tuner with automatic fine tuning Digitally controlled tuner with automatic fine tuning

1976-12-20

1978-11-28

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325420, 358191, H04B 106

Patent

active

041278224

ABSTRACT:
A tuning system for digitally controlled electronically tuned tuner with automatic fine tuning (AFT) constantly operable to hold the tuner at a predetermined optimum frequency setting, especially a television channel. A reversible counter provides the digital signal to control the tuning of the tuner and is, itself, deliberately shifted from one setting to another by pulses from a source, such pulses being applied to the UP input terminal of the counter as the up-tuning pulses to shift the tuner frequency higher. Pulses from the same source are also used as down-tuning pulses when applied to the DOWN input terminal of the tuning pulses to a lower frequency supplied to two AFT AND circuits. One output logic up-tuning instruction signal E.sub.U of the AFT circuit enables the up-tuning AFT AND circuit only in a certain sub-range below the desired frequency. The other output logic down-tuning instruction signal E.sub.D of the AFT circuit enables the other AFT AND circuit only in a certain sub-range above the desired frequency. Consequently, deliberate application of up-or-down-tuning pulses to the UP or DOWN terminals changes the count as desired, being only partially counteracted by the lower frequency, AFT-controlled pulses to the opposite counter terminal.

REFERENCES:
patent: 3949158 (1976-04-01), Rzeszewski et al.
patent: 4004231 (1977-01-01), Elshuber et al.
patent: 4025953 (1977-05-01), Sideris
patent: 4038689 (1977-07-01), Rzeszewski et al.
patent: 4041535 (1977-08-01), Rzeszewski et al.

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