Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-09-23
1984-10-23
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455165, 455186, H04B 126
Patent
active
044792484
ABSTRACT:
A tuning system is provided in which the tuning function is substantially integrated in a microprocessor. A fixed modulus counter is cascaded with a programmable counter (or timer) found within the microprocesor thereby extending the counting range of the programmable counter. Then by prescaling the output of the local oscillator to a value below the toggle frequency of the microprocessor counter, the microprocessor may periodically measure the output frequency of the oscillator and, if necessary, generate correction signals therefor.
REFERENCES:
patent: 3980951 (1976-09-01), Breeze
patent: 4110693 (1978-08-01), Evans
patent: 4142162 (1978-10-01), Alberkrack
patent: 4220922 (1980-09-01), Ikeguchi
patent: 4270145 (1981-05-01), Farina
patent: 4280140 (1981-07-01), Skerlos
patent: 4287601 (1981-09-01), Borg
Consider the Value-Added Benefits of .mu.C Use in Consumer Products, by D. Bennett, Fairchild Semiconductor, EDN Mar. 5, 1979.
Caspari Frederick W.
Heuer Daniel A.
Smith Bruce E.
Briody Thomas A.
Chin Tommy P.
Goodman Edward W.
Streeter William J.
The Magnavox Company
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