DocumentCode :
1089854
Title :
Adaptive noise canceling applied to sinusoidal interferences
Author :
Glover, John R., Jr.
Author_Institution :
University of Houston, Houston, TX, USA
Volume :
25
Issue :
6
fYear :
1977
fDate :
12/1/1977 12:00:00 AM
Firstpage :
484
Lastpage :
491
Abstract :
This paper investigates a new method for eliminating sinusoidal or other periodic interference corrupting a signal. This task is typically accomplished by explicitly measuring the frequency of the interference and implementing a notch filter at that frequency. The method proposed herein uses an adaptive filter to eliminate the interference. The procedure is called adaptive noise canceling and is applicable when an auxiliary reference input is available containing the interference alone. The reference input is filtered in such a way that it closely matches the interfering sinusoid, and is then subtracted from the primary input leaving the signal alone. The results of this research show that when a sum of sinusoids is applied to an adaptive filter, the filter converges to a dynamic solution in which the weights of the filter are time varying. This time-varying solution implements a tunable notch filter, with a notch located at each of the reference frequencies. When used in noise-canceling applications, this adaptive notch filter provides a simple alternative to other methods of tracking and eliminating sinusoidal interferences.
Keywords :
Adaptive filters; Distortion; Frequency estimation; Frequency measurement; Helium; Interference cancellation; Interference elimination; Matched filters; Noise cancellation; Signal design;
fLanguage :
English
Journal_Title :
Acoustics, Speech and Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
0096-3518
Type :
jour
DOI :
10.1109/TASSP.1977.1162997
Filename :
1162997
Link To Document :
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