Television receiver phase locked loop tuning arrangement

Details Television receiver phase locked loop tuning arrangement Television receiver phase locked loop tuning arrangement

1982-09-24

1984-04-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 455182, 455260, 3581951, H03L 716

Patent

active

044424132

ABSTRACT:
In a channel selection system of a television receiver set using a frequency synthesizer system, the local oscillator output of a voltage controlled oscillator in a tuner is coupled to through a prescaler to a programmable frequency divider. To a frequency division ratio specification input terminal of the programmable frequency divider is coupled a frequency division ratio setting data from a frequency division ratio memory. When the broadcast wave frequency is deviated from a predetermined value due to the frequency division ratio setting data, a fine tuning data corresponding to the deviation and a direction specification data representing the direction of the deviation are memorized in a random-access memory (RAM). The fine tuning data read out from the RAM is coupled to a fine tuning signal generator where it is added to or subtracted from the frequency division ratio setting data prevailing in the programmable frequency divider. The data obtained from the fine tuning signal generator as a result of the addition or subtraction is coupled as a new frequency division ratio setting data to a frequency division ratio specification input terminal of the programmable frequency divider.

REFERENCES:
patent: 4109283 (1978-08-01), Rast
patent: 4344045 (1982-08-01), Das et al.
patent: 4355416 (1982-10-01), Malerba
patent: 4360832 (1983-11-01), Rzeszewski
Hilliker, "Simplified TV Tuning System", IEEE Transactions on Consumer Electronics, Feb. 1976, pp. 61-68.

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