Adaptive notch filter design under multiple identical bandwidths |
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| Affiliation: | 1. School of Automation Science and Electrical Engineering, Beihang University, Beijing, China;2. National Key Laboratory of Science and Technology on Aerospace Intelligent Control, Beijing, China;1. Institute of Space Electronics and Information Technology, School of Electronic Science and Engineering, National University of Defense Technology, China;2. Department of Signal Processing and Acoustics, Aalto University, Finland;3. China Academy of Electronics and Information Technology, China Electronics Technology Group Corporation, China;1. National Research Center of Railway Safety Assessment, Beijing Jiaotong University, Beijing 100044, China;2. State Key Lab of Rail Traffic Control & Safety, Beijing Jiaotong University, Beijing 100044, China;1. Institute of Microengineering and Nanoelectronics (IMEN), University Kebangsaan Malaysia (UKM), Level 4 MINES Lab UKM, 43600 Bangi, Selangor, Malaysia;2. Department of Electrical, Electronic and Systems Engineering, Universiti Kebangsaan Malaysia (UKM), Faculty of Engineering & Built Environment, UKM, 43600 Bangi, Selangor, Malaysia |
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| Abstract: | ![]()
Digital notch filters are applied to remove or suppress the narrow-band interferences in digital signals, while preserving other components unchanged. Under the condition of the identical notch bandwidths, a novel design method is put forward in this paper to realize the adaptive notch filter with infinite-impulse response (IIR). Firstly, a specially simplified all-pass filter is introduced to construct an IIR non-adaptive notch filter, which serves as the core part in the adaptive one. Secondly, the criterion of least-mean-square (LMS) is applied to design the desired adaptive notch filter (ANF). The designed ANF can track and suppress multiple non-harmonic interference components simultaneously. Finally, the effectiveness and practicability of the proposed design method are verified by a set of experimental results. |
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| Keywords: | Adaptive notch filters (ANF) Multiple notch filters All-pass filters Least mean square (LMS) Identical bandwidths |
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