A novel application of the S-transform in removing powerline interference from biomedical signals

Chien Chun Huang, Sheng-Fu Liang, Ming Shing Young, Fu-Zen Shaw

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Powerline interference always disturbs recordings of biomedical signals. Numerous methods have been developed to reduce powerline interference. However, most of these techniques not only reduce the interference but also attenuate the 60 Hz power of the biomedical signals themselves. In the present study, we applied the S-transform, which provides an absolute phase of each frequency in a multi-resolution time-frequency analysis, to reduce 60 Hz interference. According to results from an electrocardiogram (ECG) to which a simulated 60 Hz noise was added, the S-transform de-noising process restored a power spectrum identical to that of the original ECG coincident with a significant reduction in the 60 Hz interference. Moreover, the S-transform de-noised the signal in an intensity-independent manner when reducing the 60 Hz interference. In both a real ECG signal from the MIT database and natural brain activity contaminated with 60 Hz interference, the S-transform also displayed superior merit to a notch filter in the aspect of reducing noise and preserving the signal. Based on these data, a novel application of the S-transform for removing powerline interference is established.

Original languageEnglish
Pages (from-to)13-27
Number of pages15
JournalPhysiological Measurement
Volume30
Issue number1
DOIs
Publication statusPublished - 2009 Apr 27

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Electrocardiography
Mathematical transformations
Noise
Notch filters
Databases
Power spectrum
Brain

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Physiology
  • Physiology (medical)

Cite this

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abstract = "Powerline interference always disturbs recordings of biomedical signals. Numerous methods have been developed to reduce powerline interference. However, most of these techniques not only reduce the interference but also attenuate the 60 Hz power of the biomedical signals themselves. In the present study, we applied the S-transform, which provides an absolute phase of each frequency in a multi-resolution time-frequency analysis, to reduce 60 Hz interference. According to results from an electrocardiogram (ECG) to which a simulated 60 Hz noise was added, the S-transform de-noising process restored a power spectrum identical to that of the original ECG coincident with a significant reduction in the 60 Hz interference. Moreover, the S-transform de-noised the signal in an intensity-independent manner when reducing the 60 Hz interference. In both a real ECG signal from the MIT database and natural brain activity contaminated with 60 Hz interference, the S-transform also displayed superior merit to a notch filter in the aspect of reducing noise and preserving the signal. Based on these data, a novel application of the S-transform for removing powerline interference is established.",
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A novel application of the S-transform in removing powerline interference from biomedical signals. / Huang, Chien Chun; Liang, Sheng-Fu; Young, Ming Shing; Shaw, Fu-Zen.

In: Physiological Measurement, Vol. 30, No. 1, 27.04.2009, p. 13-27.

Research output: Contribution to journalArticle

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