心音信号包络提取和识别方法的比较分析研究

Analysis and Improvement to the Methods of Envelope Extraction of Heart Sounds

对心音信号进行进一步的自动识别和分析之前,首先对其进行包络提取是目前比较常用且很有效的信号处理方法,采用合理的包络提取方法得到的信号包络一般都包含有原信号的有效时域信息。对于心音信号,采用包络信号进行心音各个成分的识别,进而提取有用的生理参数,不但不会影响检测精确度,而且会减少计算量,简化识别流程,提高识别效率。在分析比较几种常用的心音包络提取算法的基础上,应用基于短时平均能量的方法提取心音信号包络,获得了比较好的效果。

Heart sound envelope extraction is a common and effective approach applied before automatic identification and further analyses.The envelope of heart sound signal,which is extracted using an appropriate method,contains effective time-domain information of the original signal.The method of using envelope signal for heart sound components recognition,and then extracting useful physiological parameters,will not affect the detection accuracy,but will reduce the computation,simplify the identification process and improve the recognition efficiency.In this paper,after comparing several commonly used methods for heart sound envelope extraction,the short-time average energy method are used for getting heart sound envelope.The results show that this method is promising a good performance.