Frequency counter for a television tuning system

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

H - Electricity

04

N

365/5

H04N 5/44 (2006.01) H03J 5/02 (2006.01) H03J 7/06 (2006.01) H04B 1/16 (2006.01)

Patent

CA 1108321

RCA 70850 FREQUENCY COUNTER FOR A TELEVISION TUNING SYSTEM 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.

277946

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