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On the design of adaptive notch filters
Author(s) -
Clarke D. W.
Publication year - 2001
Publication title -
international journal of adaptive control and signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 66
eISSN - 1099-1115
pISSN - 0890-6327
DOI - 10.1002/acs.652
Subject(s) - band stop filter , control theory (sociology) , noise (video) , estimator , sine wave , transient (computer programming) , filter (signal processing) , computer science , convergence (economics) , signal (programming language) , adaptive filter , amplitude , electronic engineering , low pass filter , mathematics , algorithm , physics , engineering , statistics , electrical engineering , artificial intelligence , image (mathematics) , economic growth , operating system , control (management) , quantum mechanics , computer vision , programming language , economics , voltage
In instrumentation and other applications, the on‐line estimation of the frequency and amplitude of a noise‐corrupted sinewave is of great practical interest. Recently an adaptive notch filter (ANF) with global convergence properties has been developed, and is a candidate approach to our problem. This paper analyses the transient and noise properties of this ANF and equips the method with design equations. Using frequency ranges greater than (up to 2 decades) and signal/noise ratios less than (down to −16 dB) those commonly found in the ANF literature, it is verified by extensive simulations that the new frequency estimator has excellent tracking and noise‐rejection properties, provided that the signal/noise ratio is not too small. A comparison is made of its behaviour with that of a phase‐locked loop, a method commonly used in practice. Copyright © 2001 John Wiley & Sons, Ltd.
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