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 computer simulation. Some specific problems in the algorithm are discussed. The algorithm has been applied to heart sound signal analysis and some valuable results are obtained,
出处
《北京生物医学工程》
1997年第3期129-134,140,共7页
Beijing Biomedical Engineering
基金
国家自然科学基金
