基于Simulink的自适应心音增强

记录心音的过程中,不可避免地要引入很多种噪音.这些干扰噪音对记录的心音波形产生不利因素,甚至会严重影响心音分析的结果.在对心音信号进行进一步的处理之前,必须对噪声加以抑制.针对心音信号的非平稳性,提出了以自适应滤波方法来消除干扰,并提出了以心音间隙期的样值作为参考噪声的分析方法.运用动态系统仿真工具Simulink,建立了LMS自适应滤波的心音增强模型.实验结果表明,该方法能有效地抑制噪音,达到增强心音的目的.

Adaptive Enhancementt of Heart Sound Based on Simulink

In the course of recording heart sound, it is inevitable that many kinds of noise will be merged in the main signal. These kinds of noise disbennifit the heart sounds, even import awful influence to analysis result. So, before further processings of phonocardiographic records, noise must be suppressed. Because heart-sound is a highly nonstationary signal, this paper presents the application of adaptive filter method to the elimination of noise,and at the same time, employs the datum of heart-sound plot as the reference noise. With simulink, a modeling and simulation tool for dynamical systems, the model of LMS adaptive heart-sound enhancement is established.Tests prove this method makes effective denoising and heart-sound enhancement.