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论文类型： 期刊论文

发表时间： 2010-02-01

发表刊物： IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING

收录刊物： PubMed、SCIE、Scopus

卷号： 57

期号： 2

页面范围： 325-333

ISSN号： 0018-9294

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

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.