Pre-tuner tracking traps responsive to a tuning voltage

Details Pre-tuner tracking traps responsive to a tuning voltage Pre-tuner tracking traps responsive to a tuning voltage

1980-05-30

1982-11-30

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455213, 358196, H04B 126

Patent

active

043619096

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. In one embodiment, the tunable traps are responsive to a tuning voltage for controlling the tuned circuits of the tuner so that the attenuation frequencies of the traps track the frequencies of the RF carriers associated with selected channels. In another embodiment the attenuation frequencies of the traps are moved with respect to the respective frequencies of desired RF carriers to optimize interference reduction.

REFERENCES:
patent: 3550010 (1970-12-01), Byers
patent: 3582670 (1974-12-01), Ma
patent: 3593154 (1971-07-01), Blass
patent: 3622891 (1971-11-01), Leland
patent: 3696302 (1972-10-01), Gossard
patent: 4153887 (1979-05-01), Poppa
patent: 4215372 (1980-07-01), Suzuki

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