Bileaflet mechanical valve sound analysis using a continuous wavelet transform.

Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs
Hiroshi SugikiKeishu Yasuda

Abstract

Bileaflet mechanical valve closing sounds have splits, the duration of which is not constant in normally functioning valves. However, no reports have discussed the influences of valve malfunction on the split interval, neither have any studies discussed the fact that mechanical valve closing sound signals must be analyzed using a time-frequency analysis because they are nonstationary signals. The continuous wavelet transform (CWT), a time-frequency analyzing method using mother wavelets modified by scale numbers, was selected in this study for analyzing bileaflet valve closing sounds because it is easy to understand and has no limitations such as the cross-terms in the Wigner-Ville distribution or the tradeoff between time and frequency resolutions of the short-time Fourier transform. This study compares the properties of the mother wavelets of various CWTs and selects one that is suitable for detection of the clear split in bileaflet mechanical valve closing sound signals. This article also establishes a standard frequency analyzing system for bileaflet mechanical valve sounds. A preliminary study with chirp Doppler signals for comparing the frequency properties of the mother wavelets of various CWTs suggested that Ishikawa's ...Continue Reading

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Citations

Apr 17, 2008·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hiroshi SugikiKenji Sugiki
Apr 17, 2008·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Y SawaH Watanabe
Nov 7, 2009·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Andrea BagnoGino Gerosa
Dec 26, 2009·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Takashi SugikiKenji Sugiki
Mar 31, 2011·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Clemens RomataAndrea Bagno
May 29, 2012·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hiroshi SugikiKenji Sugiki
Mar 10, 2009·Computer Methods and Programs in Biomedicine·Ilias MaglogiannisAntonis Stasis
Sep 9, 2015·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hiroshi SugikiYoshiro Matsui
Oct 12, 2017·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Simone TosoniAndrea Bagno
Mar 8, 2018·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hiroshi Sugiki, Kenji Sugiki
Mar 24, 2007·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hiroshi SugikiKenji Sugiki
Jun 19, 2007·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Y SawaH Watanabe
May 15, 2009·The International Journal of Artificial Organs·Andrea BagnoGino Gerosa

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