基于混沌特性的复合心音发生器的设计与研究

摘要

Synthetic heart sound signals have certain application value in the teaching and scientific re-search.Here,a composite heart sound generator is designed.Firstly,the generation mechanism and chaos characteristics of heart sounds are analyzed,and the principle of composite heart sound is com-posed.Then based on chaotic characteristics of heart sound,a heart sound generator is constructed, which includes heart sound generating sub model on the left and right.With that,a set of amplitude and period adj ustable synthetic heart sound signal is obtained by processing the output waveform.After the a-nalysis of time-frequency and chaos characteristics of synthetic heart sound signal,it reveals that synthet-ic heart sound signal is highly similar to actual heart sound,and it can basically meet the need of teaching and scientific research.%产生合成心音信号在教学、科研中都有一定的实际应用价值，本文提出一种复合心音发生器。首先分析心音的产生机理和混沌特性，提出复合心音的合成原则，然后从心音的混沌特性出发构建一种心音发生器，它包括左侧心音产生子模型和右侧心音产生子模型，对它们的输出波形进行合成处理，从而得到一组幅值、周期都可调的合成心音信号。通过对合成心音信号的时频特征和混沌特征进行分析，结果表明，该合成心音信号与实际心音信号具有很高的相似度，可以基本满足教学和科研的需求。