Voltage controlled tuner with voltage variable frequency selecti

Details Voltage controlled tuner with voltage variable frequency selecti Voltage controlled tuner with voltage variable frequency selecti

1981-10-08

1983-08-16

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 334 15, H04B 116

Patent

active

043995594

ABSTRACT:
In a television receiver, two tunable traps are incorporated between the RF input and the tuner to attenuate undesired signals symmetrically located in frequency below and above respective desired RF carriers. The tunable traps are responsive to a control voltage generated independently of the tuning voltage for controlling the tuned circuits of the tuner so that the attenuation frequencies of the traps can be moved with respect to the respective frequencies of desired RF carriers to optimize interference reduction.

REFERENCES:
patent: 3517352 (1970-06-01), Marshall et al.
patent: 3550010 (1970-12-01), Byers
patent: 3696302 (1972-10-01), Gossard
patent: 3845393 (1974-10-01), Basset
patent: 3852670 (1974-12-01), Ma
patent: 4023106 (1977-05-01), Utsunomiya
patent: 4081771 (1978-03-01), Hendrickson
patent: 4153887 (1979-08-01), Poppa
patent: 4291290 (1981-09-01), Ijichi

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