Tuning system

Details Tuning system Tuning system

1980-05-16

1982-09-28

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455184, 455185, 455196, H03J 718, H03J 524

Patent

active

043522050

ABSTRACT:
A tuning system comprising a memory for storing therein local oscillation frequencies of a plurality of channels to be received and an intermediate frequency, a first control loop circuit for controlling an oscillation frequency of a controlled oscillator on the basis of one local oscillation signal stored in said memory, and a second control loop circuit for controlling a controlled oscillator in such a manner as to render the intermediate frequency of the tuner itself constant on the basis of the intermediate frequency stored in said memory after said first control loop circuit is locked.

REFERENCES:
patent: 4041535 (1977-08-01), Rzeszewski
patent: 4081752 (1978-03-01), Sumi
patent: 4100578 (1978-07-01), Arneson
patent: 4123713 (1978-10-01), Wine
patent: 4123716 (1978-10-01), Borg
patent: 4128849 (1978-12-01), Rhee
patent: 4142158 (1979-02-01), Belisomi
patent: 4155043 (1979-05-01), Sakamoto
patent: 4207531 (1980-06-01), Ito
patent: 4236251 (1980-11-01), Ohgishi
patent: 4305157 (1981-12-01), Mogi

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