Noise and Disturbance Reduction for Heart Sounds in Cycle-Frequency Domain Based on Nonlinear Time Scaling

被引：27

作者：

Tang, Hong ^{[1
]}

Li, Ting ^{[2
]}

Qiu, Tianshuang ^{[1
]}

机构：

[1] Dalian Univ Technol, Dept Biomed Engn, Dalian 116024, Peoples R China

[2] Dalian Nationalities Univ, Coll Electromech & Informat Engn, Dalian 116600, Peoples R China

来源：

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING | 2010年 / 57卷 / 02期

基金：

美国国家科学基金会;

关键词：

Cycle-frequency domain; cyclic stationarity enhancement; disturbance reduction; heart sounds; noise reduction; nonlinear time scaling; ALGORITHM;

D O I：

10.1109/TBME.2009.2028693

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

Through an investigation of various clinical cases, heart sounds are found to be quasi-cyclostationary. Nonlinear time scaling from cycle-to-cycle is proposed to enhance cyclic stationarity, where nonlinear time scaling is approximated by a piecewise linear function. The techniques of cyclostationary signal processing are employed in this paper to reduce noise and disturbance in the cycle-frequency domain. Heart sounds can be theoretically recovered in the presence of additive, zero mean noise, and disturbance (perhaps non-Gaussian, nonstationary, or colored). The experimental tests in various conditions confirm the theoretical results.

引用

页码：325 / 333

页数：9

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