Sequential channel tuning system with a memory

Details Sequential channel tuning system with a memory Sequential channel tuning system with a memory

1975-10-14

1977-05-10

Safourek, Benedict V.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325455, 325468, 334 15, H04B 126

Patent

active

040231070

ABSTRACT:
An all-channel two mode television tuning system includes a presettable counter for deriving the number of a receivable television channel by counting the local oscillator frequency. The frequency is varied by a ramp voltage circuit under the control of a comparator which adjusts the tuning based upon the difference between the derived channel number and a desired channel number sequentially generated by externally activated channel counters. A 82 .times. 1 bit read/write memory is addressed in the first or program mode by the generated channel number to provide locations for storage of signals for tuning to preselected channels. In the second or operate mode logic circuitry interrupts the advancement of the channel counters whenever a generated channel number corresponds to a preselected channel number.

REFERENCES:
patent: 3748645 (1973-07-01), Kawashima
patent: 3845394 (1974-10-01), Hamada
patent: 3864637 (1975-02-01), Kanow
patent: 3931579 (1976-01-01), Ma et al.
patent: 3940702 (1976-02-01), Yoshimura et al.
patent: 3955145 (1976-05-01), Kawashima

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