Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2006-01-03
2006-01-03
Le, Lana (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S306000, C455S334000, C455S226100
Reexamination Certificate
active
06983136
ABSTRACT:
A Method for filter tuning using direct digital sub-sampling is provided. The tuning is accomplished in the digital domain by determining the filter characteristics from the shape of the transfer function. The input signal (1) is passed through the filter (3) and is then sub-sampled by and Analog-to-digital Converter (ADC) (5). The sub-sampled signal (6) is then processed in the digital domain using a digital circuit (7) that is used to determine the center frequency (Fc) and Quality factor (Q) and/or other important filter parameters. The Fc, Q and/or other important filter parameters are then adjusted by generating digital control signals (8) that can be converted to analog signals (10) using Digital-to-analog Converters (DACs) (9).
REFERENCES:
patent: 4172967 (1979-10-01), Porter et al.
patent: 4402089 (1983-08-01), Knight et al.
patent: 4495470 (1985-01-01), Bristol
patent: 5640698 (1997-06-01), Shen et al.
patent: 5945889 (1999-08-01), Shanthi-Pavan et al.
patent: 5949832 (1999-09-01), Liebetreu et al.
patent: 5963856 (1999-10-01), Kim
patent: 6078630 (2000-06-01), Prasanna
patent: 6122496 (2000-09-01), Yoshioka
patent: 6266522 (2001-07-01), Holden et al.
patent: 6278866 (2001-08-01), Elder et al.
patent: 6307443 (2001-10-01), Gabara
patent: 6512803 (2003-01-01), Heinzl et al.
patent: 6577854 (2003-06-01), Hotto
patent: 6658263 (2003-12-01), Ke et al.
patent: 6683919 (2004-01-01), Olgaard et al.
patent: 6741636 (2004-05-01), Lender
patent: 2001/0049267 (2001-12-01), Takalo et al.
patent: 2002/0181614 (2002-12-01), Mostafa et al.
patent: 2004/0219900 (2004-11-01), Zheng et al.
DeVries Chris
Mason Ralph
Cassan MacLean
Eno Semiconductor Inc.
Le Lana
LandOfFree
Directly tuned filter and method of directly tuning a filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Directly tuned filter and method of directly tuning a filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directly tuned filter and method of directly tuning a filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3600230