Digital filter

Details Digital filter Digital filter

2011-08-09

2011-08-09

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

Reexamination Certificate

active

07995690

ABSTRACT:
Digital filter (104), comprising: a first frequency shifting mechanism (106) configured to shift an input spectrum (H(f)) of an input signal (100) by a first frequency distance (F1) to obtain a shifted frequency signal (122) with a shifted spectrum; a filter (108), configured to filter said shifted frequency signal with a predetermined transfer function to obtain a filtered signal (130); and a signal processor (110), said signal processor including: an adder (202), and at least a second frequency shifting mechanism (222), said signal processor (110) being configured to generate an output signal (140), which is a sum of said filtered signal (130) and said shifted frequency signal (122) and said output signal (140) has an output spectrum, which is shifted by a second frequency distance (DF) with respect to said shifted spectrum, wherein said second frequency distance (DF) is independent of said first frequency distance (F1).

REFERENCES:
patent: 2005/0013353 (2005-01-01), Alloin
patent: 2006/0019604 (2006-01-01), Hasarchi
patent: 2006/0290819 (2006-12-01), Benjebbour et al.
patent: 2007/0189419 (2007-08-01), Filipovic
patent: 1 160 978 (2001-12-01), None
patent: 1 696 563 (2006-08-01), None
patent: WO 2005/004499 (2005-01-01), None
U.S. Appl. No. 12/039,250, filed Feb. 28, 2008, Spalink, et al.

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