Synthesizer tuner

Details Synthesizer tuner Synthesizer tuner

1979-07-12

1981-08-04

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455184, 455186, H04B 126, H03L 718

Patent

active

042826039

ABSTRACT:
A selecting information for adjusting the frequency-dividing ratio of a programable divider in a PLL synthesizer tuner is stored in the memory.
In order to prevent the same selecting information from being written down in the different addresses in the memory, all of the selecting informations already written down in the memory is compared with the selecting information that is to be written down by a comparator circuit before the selecting information is written down in the memory. The output of the comparator circuit permis the selecting information to be written into the new addresses only when the selecting information that is to be written down is different from all of the selecting informations which have been written down already.

REFERENCES:
patent: 3990027 (1976-11-01), Kawashima
patent: 4110694 (1978-10-01), Wilhelm
patent: 4138647 (1979-02-01), Wine

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