Selectively coupled synthesizer for tuner of TV receiver

Details Selectively coupled synthesizer for tuner of TV receiver Selectively coupled synthesizer for tuner of TV receiver

1976-05-24

1978-12-05

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358195, 358167, 325464, 325468, 334 15, H04N 544, H04N 550, H04N 521, H04N 116

Patent

active

041288491

ABSTRACT:
A television receiver is disclosed including a varactor-type tuner selectively coupled to a synthesizer. Illustratively, the synthesizer includes a keyboard for selecting the desired channel within the UHF or VHF band, a channel memory for receiving and storing the selected channel and a programmable divider which divides selectively the output of the tuner's local oscillator in accordance with the selected channel to generate and apply its output to a phase comparator. The output of a reference oscillator also is applied to the phase comparator, whereby the output of the programmable divider is mixed therewith to obtain a tuning voltage to be applied to the tuner, which is associated with an automatic fine-tuning circuit (AFT); the AFT is adapted to be detuned selectively to increase the amplitude of the picture carrier signal and therefore, enhance the quality of the displayed images for weak signals, such as received from distant stations.

REFERENCES:
patent: 3632864 (1972-01-01), Evans
patent: 3902121 (1975-08-01), Yoshino et al.
patent: 3934191 (1976-01-01), Garskamp
patent: 3949158 (1976-04-01), Rzeszewski
patent: 3965423 (1976-06-01), Fish, Jr. et al.
patent: 3973228 (1976-08-01), Mueller et al.
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4009439 (1977-02-01), Rast
patent: 4025953 (1977-05-01), Sideris
patent: 4038689 (1977-07-01), Rzesewski et al.
patent: 4041535 (1977-08-01), Rzesewki et al.
A Frequency Synthesizer for Television Receivers; Breeze et al, Transactions BTR, Nov. 1974, pp. 259-263.
Hilliker; Simplified TV Tuning System; IEEE Transactions, Consumer Electronics, Feb. 1976.

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