H - Electricity – 03 – J
Patent
H - Electricity
03
J
365/6
H03J 5/04 (2006.01) H03J 1/00 (2006.01)
Patent
CA 1176767
ABSTRACT A channel selector comprises a programmable frequency-divider in which frequency-division ratio data available for deriving a desired local oscillation frequency according to the PLL technique are set, and a controller responsive to external control signals for producing fine tuning data to vary the frequency-division ratio data and varying the frequency-division ratio data according to the fine tuning data. The fine tuning data consist of up/ down data for indicating whether the frequency-division ratio data is to be increased or decreased and quantitative data representing the quantity to be varied. The fine tuning data are stored in a memory device. If the channel for which fine tuning data were produced is again selected, the controller reads out the frequency-division ratio data corresponding to that channel which have been preliminarily stored in the memory device, and at the same time reads out the fine tuning data corresponding to that channel from the memory device. The controller varies the read frequency-division ratio data according to the contents of the read fine tuning data, that is, the up/down data and the quantitative data, and then sets the varied new frequency-division ratio data in the programmable frequency-divider. Accordingly, the frequency-division ratio data derived as a result of the manual fine tuning operation carried out for a transmission frequency having a large frequency deviation, can be again set in the programmable frequency-divider without necessitating any manual operation by a TV viewer, when the same channel has been again selected to be received.
382179
Nippon Electric Co. Ltd.
Smart & Biggar
LandOfFree
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