Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
1998-04-21
2001-04-17
Pham, Chi (Department: 2631)
Pulse or digital communications
Receivers
Interference or noise reduction
C455S296000, C379S413020
Reexamination Certificate
active
06219390
ABSTRACT:
THE FIELD OF THE INVENTION
The present invention is directed generally towards interference cancellers, and more particularly towards an interference canceller which uses digital synthesis techniques to eliminate narrow band radio frequency interference (RFI).
BACKGROUND OF THE INVENTION
Conventional narrow band RFI cancellers such as line-interference cancellers eliminate the RFI present in a signal in order to improve the clarity and strength of the signal. Such devices are well known in the art and employ analog techniques to analyze the spectrum of a signal, estimate the level of RFI present in the signal, and then subtract this estimated RFI from the signal.
Such devices are used, for example, as part of communications receivers to eliminate the narrow band RFI generated by power lines. These conventional devices, however, suffer from a significant drawback in that the amount of RFI which can be eliminated is limited. Accordingly, there is a need for a device which can eliminate greater amounts of RFI. Therefore, it would be desirable to provide a canceller which can overcome the drawback of conventional cancellers by employing digital synthesis techniques to eliminate narrow band RFI.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided an adaptive RFI canceller using digital synthesis and a digital to analog converter for eliminating narrow band RFI.
REFERENCES:
patent: 5235612 (1993-08-01), Stilwell et al.
patent: 5410750 (1995-04-01), Cantwell et al.
patent: 5537443 (1996-07-01), Yoshino et al.
patent: 5761237 (1998-06-01), Petersen et al.
patent: 5894500 (1999-04-01), Bruckert et al.
Lucent Technologies - Inc.
Pham Chi
Tran Khai
LandOfFree
Adaptive interference canceller using digital control... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive interference canceller using digital control..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive interference canceller using digital control... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2455595