【作者】 付文杰；

【导师】 王玉泰；

【作者基本信息】 济南大学 ， 信号与信息处理， 2011， 硕士

【摘要】 近些年以来,随着生活环境的恶化和工作压力加大,心血管疾病已经成为严重危害人类健康的疾病之一。心音信号是检测心血管疾病检测的一个重要手段,目前心音信号的检测一般通过听诊器,凭借医疗工作者的经验进行判断,这种方式具有很大的主观性和局限性。为了能够快速、客观的检测心音信号,本文设计了基于开放式多媒体应用平台(Open Multimedia Applications Platform,简称OMAP)的心音分析仪。本文首先介绍了心音信号的特性和基于心音检测心血管疾病技术的发展基本情况,然后根据心音信号目前的发展状况和趋势提出了基于OMAP的心音分析仪的思想;本文在对心音分析仪的关键技术进行了研究的基础上,确定了基于OMAP3530的心音分析仪的硬件设计方案和软件设计方案。在心音信号的算法处理上,经过仔细对比当前的心音信号的处理技术,提出采用自相关系数的方法对心音信号分段,以心音信号的小波包能量熵为特征,采用DTW分类算法对心音信号进行分类。心音分析仪的硬件设计采用核心板加底板的设计方案,这样方便升级核心芯片和扩展功能。为了方便软件的开发和系统的升级,方便管理OMAP3530内存和硬件资源,选取了开源的Linux操作系统,并根据心音分析仪的需求,对Linux内核裁剪和移植。心音分析仪的软件开发基于Nokia公司Qt图形界面集成开发工具,采用分层设计的思想,为心音分析仪预留了升级的接口,方便心音分析仪的调试和升级。论文在最后采用Ti公司的C6runapp编译工具对心音分析仪的软件进行了优化,并对心音分析仪的功能做了测试。本文基于OMAP平台实现了心音分析仪的设计,为心音信号的自动化处理提供了一种新平台,为心音信号用于心血管疾病领域的辅助诊断奠定了基础。更多还原

【Abstract】 Recently, with the deterioration of living conditions and increased work pressure, cardiovascular disease has become one of the serious diseases that do harm to human health. Heart sound is an important measure for cardiovascular disease detection, however, heart sound signal detection generally through a stethoscope currently, which depends on the judgment of medical workers’experience. This method may have lots of subjectivity. In order to detect cardiovascular diseases quickly and objectively, we designed a heart sound analyzer based on OMAP (Open Multimedia Applications Platform) in this paper.This paper introduces the characteristics of heart sounds and the development of heart sounds detection of cardiovascular diseases technology firstly. Subsequently, we studied the key technologies of heart sound analyzer, and then we proposed the design idea of heart sound analyzer based on OMAP hardware.In heart sound processing, we carefully compared the current heart sound signal segmentation technology, and then adopted the correlation coefficients of the heart sound for heart sound segmentation. The wavelet packet energy entropy was extracted as feature of heart sound signal, and DTW was used for heart sound classification.In order to upgrade the core chip and extend functions of heart sound analyzer, we employed the core board and bottom board design scheme. In order to develop software, upgrade systems conveniently, manage memory and hardware resources of OMAP3530, we selected the open source Linux operating system in our project. Linux kernel has been cut and transplanted according to the demand of heart sound analyzer. We adopted Nokia Qt GUI development tools for the design of heart sound analyzer software. In order to upgrade and debug the software easily, we took the hierarchical design ideas, and reserved the interface to upgrade the program.Finally, we optimized the heart sound analyzer software by the use of Ti’s C6runapp compiler tools, and tested the function of heart sounds analyzer, and achieved the goals of this heart sound analyzer system.In this paper, we realized the design of heart sound analyzer based on OMAP, which provides a new platform for the automated processing of heart sounds and plays a basis role for the assistant diagnosis of cardiovascular disease.更多还原