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Standard filter approximations for low power Continuous Wavelet Transforms.

Authors
  • Casson, Alexander J
  • Rodriguez-Villegas, Esther
Type
Published Article
Journal
Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Publication Date
Jan 01, 2010
Volume
2010
Pages
646–649
Identifiers
DOI: 10.1109/IEMBS.2010.5627245
PMID: 21096545
Source
Medline
License
Unknown

Abstract

Analogue domain implementations of the Continuous Wavelet Transform (CWT) have proved popular in recent years as they can be implemented at very low power consumption levels. This is essential for use in wearable, long term physiological monitoring systems. Present analogue CWT implementations rely on taking mathematical a approximation of the wanted mother wavelet function to give a filter transfer function that is suitable for circuit implementation. This paper investigates the use of standard filter approximations (Butterworth, Chebyshev, Bessel) as an alternative wavelet approximation technique. This extends the number of approximation techniques available for generating analogue CWT filters. An example ECG analysis shows that signal information can be successfully extracted using these CWT approximations.

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