Sponsor
Portland State University. Department of Electrical Engineering.
First Advisor
Y.C. Jenq
Date of Publication
1-14-1994
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Electrical Engineering
Department
Electrical Engineering
Language
English
Subjects
Algorithms, Adaptive filters
DOI
10.15760/etd.6686
Physical Description
1 online resource (iv, 59 p.)
Abstract
The thesis presents a new adaptive notch filter (ANF) algorithm that is more accurate and efficient and has a faster convergent rate than previous ANF algorithms. In 1985, Nehorai designed an infinite impulse response (UR) ANF algorithm that has many advantages over previous ANF algorithms. It requires a minimal number of parameters with constrained poles and zeros. It has higher stability and sharper notches than any ANF algorithm until now. Because of the special filter structure and the recursive prediction error (RPE) method, however, the algorithm is very sensitive to the initial estimate of the filter coefficient and its covariance. Furthermore, convergence to the true filter coefficient is not guaranteed since the error-performance surface of the filter has its global minimum lying on a fairly flat region. We propose a new ANF algorithm that overcomes the convergence problem. By choosing a smaller notch bandwidth control parameter that makes the error-performance surface less flat, we can more easily detect a global minimum. We also propose a new convergence criterion to be used with the algorithm and a self-adjustment feature to reset the initial estimate of the filter coefficient and its covariance. This results in guaranteed convergence with more accurate results and more efficient computations than previous ANF algorithms.
Rights
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Persistent Identifier
https://archives.pdx.edu/ds/psu/28006
Recommended Citation
Huang, Yuchen, "Adaptive Notch Filter" (1994). Dissertations and Theses. Paper 4802.
https://doi.org/10.15760/etd.6686
Comments
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