Frequency counter for a television tuning system

Details Frequency counter for a television tuning system Frequency counter for a television tuning system

1976-05-21

1978-08-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358193, 358195, 325419, 325470, H04N 544, H04N 550, H04B 116, H04B 132

Patent

active

041092830

ABSTRACT:
A tuning system for a television receiver includes a local oscillator which is controlled first by a phase lock loop arrangement and then by an AFT discriminator arrangement for tuning the receiver to non-standard as well as standard frequency carriers. The phase lock loop arrangement includes a programmable divider for dividing the local oscillator frequency by a programmable factor corresponding to the presently selected channel. When the local oscillator is being controlled by the AFT discriminator arrangement, the count accumulated by the programmable divider during a reference interval determines how far the local oscillator frequency has drifted from its nominal value. If a predetermined frequency offset has been exceeded, control is returned to phase lock loop control and the programmable factor is incrementally changed.

REFERENCES:
patent: 3931579 (1976-01-01), Ma et al.
patent: 3962640 (1976-06-01), Bomba
patent: 3968444 (1976-07-01), Tenny
patent: 4009439 (1977-02-01), Rast
patent: 4024476 (1977-05-01), Briggs
patent: 4031549 (1977-06-01), Rast et al.

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