Tuning method and apparatus for reducing interference...

Details Tuning method and apparatus for reducing interference... Tuning method and apparatus for reducing interference...

2005-11-21

2008-09-02

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S188100, C455S266000, C348S731000

Reexamination Certificate

active

07421262

ABSTRACT:
A tuning method comprises: detecting a fundamental intermediate frequency IF0of a channel to be received; determining whether the fundamental intermediate frequency IF0is affected by an adjacent channel; when the fundamental intermediate frequency IF0is affected by the adjacent channel, detecting a tuning intermediate frequency that is not affected by the adjacent channel while changing the fundamental intermediate frequency IF0; when there is no variable intermediate frequency that is not affected by the adjacent channel, detecting a variable intermediate frequency that is least affected by the adjacent channel as the tuning intermediate frequency; and tuning the channel using the tuning intermediate frequency. A tuning apparatus comprises: a tuner for detecting a fundamental intermediate frequency IF0of a channel to be received, a flash memory for storing a tuning algorithm, and a demodulator for detecting a tuning intermediate frequency while changing the fundamental intermediate frequency IF0, and for tuning the channel using the tuning intermediate frequency based on a prescribed tuning algorithm, the tuning intermediate frequency being a variable intermediate frequency IFnthat is not affected by an adjacent channel.

REFERENCES:
patent: 6876401 (2005-04-01), Yamamoto
patent: 7269401 (2007-09-01), Saito et al.
patent: 2005/0020220 (2005-01-01), Gamou
patent: 2005/0181741 (2005-08-01), Raj et al.

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