Removing residual power-line interference using WHT adaptive filter
Resource
[Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] EMBS/BMES Conference, 2002. Proceedings of the Second Joint
Journal
[Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] EMBS/BMES Conference, 2002. Proceedings of the Second Joint
Pages
-
Date Issued
2002
Date
2002
Author(s)
Lin, Bor-Shyh
Lin, Bor-Shing
Lee, Wan-Chi
Chong, Fok-Ching
Lin, Yue-Der
DOI
1094-687X
Abstract
Power-line interference is a common phenomenom in low-frequency biophysical measurement. The usual way of solving this is the use of a fixed bandwidth in an analog or digital notch filter. However, these methods are not very suitable when the power-line interference frequency is non-stationary. In this paper, an effective adaptive filter (ADF) structure is proposed to minimize the residual power-line interference without loss of reality. In order to obtain a satisfactory and acceptable convergence performance, the Walsh-Hadamard (WHT) transform is used in the ADF. Throughout many clinical measurements, the result of this structure is effective in eliminating EMI/EMC interference. However, to overcome the continuous changing frequency of power-line interference and to obtain a better convergence rate, a transform domain adaptive filter (TDADF) is used. An ECG result is shown after removing the power-line interference and its FFT.
SDGs
Type
journal article
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