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Classical low-pass filter and real-time wavelet-based denoising technique implementedon a DSP: a comparison study*

Published online by Cambridge University Press:  25 October 2002

Ch. Dolabdjian ,
J. Fadili  and
E. Huertas Leyva
Ch. Dolabdjian*
Affiliation:
Groupe de Recherche en Informatique, Image et Instrumentation de Caen (CNRS UMR 6072), ISMRA et Université de Caen, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
J. Fadili
Affiliation:
Groupe de Recherche en Informatique, Image et Instrumentation de Caen (CNRS UMR 6072), ISMRA et Université de Caen, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
E. Huertas Leyva
Affiliation:
Groupe de Recherche en Informatique, Image et Instrumentation de Caen (CNRS UMR 6072), ISMRA et Université de Caen, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France
*
C.Dolabdjian@greyc.ismra.fr
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Abstract

We have implemented a real-time numerical denoising algorithm, using the Discrete Wavelet Transform (DWT), on a TMS320C3x Digital Signal Processor (DSP). We also compared from a theoretical and practical viewpoints this post-processing approach to a more classical low-pass filter. This comparison was carried out using an ECG-type signal (ElectroCardiogram). The denoising approach is an elegant and extremely fast alternative to the classical linear filters class. It is particularly adapted to non-stationary signals such as those encountered in biological applications. The denoising allows to substantially improve detection of such signals over Fourier-based techniques. This processing step is a vital element in our acquisition chain using high sensitivity magnetic sensors. It should enhance detection of cardiac-type magnetic signals or magnetic particles in movement.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 20 , Issue 2: Instrumentation Interdisciplinary Colloque (C2I 2001) , November 2002 , pp. 135 - 140
Copyright
© EDP Sciences, 2002

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Footnotes

*

This paper has been first presented orally at the C2I colloquium in February 2001

References

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