Electronic tuning control system for television

Details Electronic tuning control system for television Electronic tuning control system for television

1975-08-13

1976-09-14

Richardson, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325419, 334 15, H04B 116

Patent

active

039809510

ABSTRACT:
A fine tunable electronic channel select system for controlling the varactor tuner of a television receiver or the like and including a dual mode prescaler for dividing the local oscillator (VCO) frequency of the tuner by a first divisor and then by a second divisor to produce a selectively variable average divide during a sample period, a programmable digital divider for dividing the output of the prescaler by a predetermined divisor corresponding to a selected television channel, a channel selection mechanism for controlling the programmable divider, a signal source for generating a stable reference frequency, a frequency/phase comparator for comparing the output of the programmable divider with the reference signal to develop an error signal, an integrator/amplifier for integrating the error signal to develop a biasing signal for controlling the tuner, and a fine-tune control circuit for selectively controlling the length of time the prescaler operates in each of its two modes, thereby enabling incremental variation of the biasing signal to provide fine tuning of the varactor tuner.

REFERENCES:
patent: 3913020 (1975-10-01), Anrooy
patent: 3924192 (1975-12-01), George

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