A Chaotic Viewpoint on Noise Reduction from Respiratory Sounds

Malihe Molaie^a, S. Jafari^a, M. H. Moradi^a, J. C. Sprott^b, S. Mohammad Reza Hashemi Golpayegani^a
^aDepartment of Biomedical Engineering, Amirkabir University of Technology, 424 Hafez Avenue,Tehran 15875-4413, Iran
^bDepartment of Physics, University of Wisconsin--Madison, Madison, WI 53706, USA

Received 20 July 2013, Received in revised form 2 October 2013, Accepted 31 October 2013, Available online 4 December 2013

ABSTRACT

Analysis of respiratory sounds can help the recognition of various respiratory diseases. Due to acoustic noise in hospital environments, the recorded sounds are polluted. The noise can destroy the analysis and should therefore be removed. Because of the chaotic nature of respiratory sounds, traditional noise reduction methods may not be efficient. Thus taking advantage of algorithms especially devised for noise reduction from chaotic signals can lead to better results. In this paper, a new method based on an original local projection algorithm is presented to reduce the noise in respiratory sounds.

Ref: M. Molaie, S. Jafari, M. H. Moradi, J. C. Sprott, and S. M. R. H. Golpayegani, Biomedical Signal Processing and Control 10, 245-249 (2014)

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