北京生物医学工程

基于时频分解法抑制Wigoner分布交叉项的研究及其在心音分析中应用 _

Suppression o f the Crossterm in Wigner Distribution Based on Time-FrequenceDomain Decomposition Technique and ItsApplication to Heart Sound Signal Analysis

作者：高小榕; 陈奎孚; 杨福生; 孙晓英;

单位：清华大学电机系; 中国协和医科大学基础医学院;

关键词：心音; 信号分析; Wigner分布; 时频分析;

分类号：

出版年·卷·期（页码）：1997·1·3（129-134）

摘要：

通过时域分段、频域分解，将关心的时频区域分解成多个子区域，把每个子区域上独立求得的Ｗｉｇｎｅｒ分布函数拼接成总体Ｗｉｇｎｅｒ分布，从而抑制常规Ｗｉｇｎｅｒ分布的交叉项。仿真结果表明了这一方法的有效性。文中讨论了时频分解中几种现象，给出了相应措施。将这一方法应用于实际的心音分析，证明可提取反映生理过程的参数。

Suppression of Wigner distribution crossterm by time-frequency domain decomposition was studied. By segmenting in time domain and frequence domain, the whole domain were cut into many subdomains, and the whole domain Wigner Distribution can be obtained by concatenate the subdomain Wigner distributions. Thus, the crossterm in conventional Wigner distribution was suppressed. Theoretically, the external crossterm can be eliminated by using this technique. The validity of the method has been verified by compute...

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