Variable ramp speed TV tuning system for rapid channel tuning

Details Variable ramp speed TV tuning system for rapid channel tuning Variable ramp speed TV tuning system for rapid channel tuning

1980-12-29

1983-02-15

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455184, 455186, 3581931, 3581951, H04B 116, H04N 550, H03J 706

Patent

active

043744370

ABSTRACT:
Disclosed is a microcomputer-controlled frequency synthesis television tuning system utilizing variable tuning ramp speeds following channel selection. Channel tuning is expedited by means of three ramping speeds employed during the tuning process. The system initially ramps quickly toward the selected channel and then automatically and incrementally reduces tuning speed as the proper frequency is approached. Once the proper frequency has been reached, the variable ramp speed signal acquisition mode is terminated and an AFC mode is initiated. Large frequency changes are thus made possible over short periods to accomodate widely separated channels efficiently.

REFERENCES:
patent: 3943449 (1976-03-01), Hendrickson et al.
patent: 4070629 (1978-01-01), Merrell
patent: 4105948 (1978-08-01), Wolkstein
patent: 4114100 (1978-09-01), Klank
patent: 4156197 (1979-05-01), Merrell
patent: 4254506 (1981-03-01), Henderson et al.
patent: 4291413 (1981-09-01), Henderson et al.

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