Tuner

Details Tuner Tuner

2005-11-22

2005-11-22

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S311000, C455S340000, C455S266000

Reexamination Certificate

active

06968173

ABSTRACT:
A tuner comprises a frequency changer which converts an input signal to a predetermined fixed intermediate frequency. The frequency changer is followed by an IF filter having a filter parameter, such as center frequency, which is electronically adjustable. A controller adjusts the adjustable filter characteristic so as to achieve a predetermined desired filtering performance, such as ensuring that the filter center frequency corresponds to the desired intermediate frequency. The controller comprises a local oscillator having the same type of tuned circuit as the IF filter. A phase locked loop compares the local oscillator frequency with a reference frequency and controls the tuned circuits of the IF filter and the local oscillator.

REFERENCES:
patent: 4524389 (1985-06-01), Isobe et al.
patent: 5283532 (1994-02-01), Burkhart et al.
patent: 6795128 (2004-09-01), Yamamoto
patent: 0863623 (1998-09-01), None
patent: 2101432 (1983-01-01), None
patent: 2270223 (1994-03-01), None
patent: 2294602 (1996-05-01), None
patent: 2335100 (1999-09-01), None
patent: 95/30283 (1995-11-01), None
patent: 99/59256 (1999-11-01), None

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