Tuners – Tuner unit with electromagnetic operator – Predetermined center frequency selector
Patent
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
Camasto Nicholas A.
Ng Jin F.
Safourek Benedict V.
Zenith Radio Corporation
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