Signal processing circuit for tuner which applies signal...

Details Signal processing circuit for tuner which applies signal... Signal processing circuit for tuner which applies signal...

2007-09-11

2007-09-11

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S266000, C455S315000

Reexamination Certificate

active

10927793

ABSTRACT:
A signal processing circuit for a tuner has a detector band pass filter for extracting a carrier of an intermediate frequency signal, a frequency counter for counting, based on a clock signal, a frequency of a carrier of the intermediate frequency signal which passes through the detector band pass filter, and an intermediate frequency variation signal outputting section for outputting an intermediate frequency variation signal based on a difference between the counted frequency and a frequency of the clock signal. Based on the intermediate frequency variation signal, a frequency selection characteristic of an intermediate frequency band pass filter, a signal detector, an adjacent interference detector, or an S-meter-band pass filter are controlled. In this manner, even when a carrier frequency of an intermediate frequency signal input from a tuner varies, the frequency selection characteristic of the intermediate frequency band pass filter, signal detector, adjacent interference detector, and S-meter-band pass filter can be suitably controlled.

REFERENCES:
patent: 5493710 (1996-02-01), Takahara et al.
patent: 5630215 (1997-05-01), Waldie et al.
patent: 2005/0260964 (2005-11-01), Wagner
patent: 2006/0003718 (2006-01-01), Oohata et al.
patent: 7-22975 (1995-01-01), None
English Patent Abstract for 7-22975 from esp@cenet, published Jan. 24, 1995.
Korean Office Action dated Apr. 28, 2006 issued in Korean Patent Application No. 10-2004-67798, with English translation, 3 pages.
English Patent Abstract for 7-22975 from esp@cenet, published Jan. 24, 1995.

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