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发布时间：2019-03-09

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：Scopus、SCIE、PubMed

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.