Complex digital signal channel select filter for analog...

Details Complex digital signal channel select filter for analog... Complex digital signal channel select filter for analog...

2004-10-18

2008-12-09

Nguyen, Tu X (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S213000

Reexamination Certificate

active

07463874

ABSTRACT:
A fully-integrated tuner for performing signal channel selection and image rejection in an analog cable television system is provided. Various embodiments disclose a tuner including an analog RF section to process an analog RF input signal and generate complex low intermediate frequency digital signals, and a signal processing section configured to reduce image and signal leakage in the complex low intermediate frequency signals. The signal processing section selects a signal channel of the complex low intermediate frequency signals and suppresses channel components adjacent to the signal channel. In one embodiment, the signal processing section includes a complex digital signal channel select filter to select the signal channel and suppress the adjacent channel components. In other embodiments, the complex digital signal channel select filter selects the signal channel, shapes the selected signal channel to generate a shaped signal channel, and equalizes a group delay of the shaped signal channel.

REFERENCES:
patent: 5737035 (1998-04-01), Rotzoll
patent: 6177964 (2001-01-01), Birleson et al.
patent: 6377315 (2002-04-01), Carr et al.
patent: 6892060 (2005-05-01), Zheng
patent: 7098967 (2006-08-01), Kanno et al.
patent: 2003/0162521 (2003-08-01), Vorenkamp et al.
patent: 2006/0189290 (2006-08-01), Olson

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