Rangayyan R M, Lehner R J
Department of Electrical Engineering, University of Calgary, Alberta, Canada.
Crit Rev Biomed Eng. 1987;15(3):211-36.
Many disease of the heart cause changes in heart sounds and additional murmurs before other signs and symptoms appear. Hence, heart sound analysis by auscultation is the primary test conducted by physicians to assess the condition of the heart. Yet, heart sound analysis by auscultation as well as analysis of the phonocardiogram (PCG) signal have not gained widespread acceptance. This is due mainly to many controversies regarding the genesis of the sounds and the lack of quantitative techniques for reliable analysis of the signal features. The heart sound signal has much more information than can be assessed by the human ear or by visual inspection of the signal tracings on paper as currently practiced. Here, we review the nature of the heart sound signal and the various signal-processing techniques that have been applied to PCG analysis. Some new research directions are also outlined.
许多心脏疾病在出现其他体征和症状之前，就会导致心音变化并出现额外的杂音。因此，听诊进行的心音分析是医生评估心脏状况的主要检查方法。然而，听诊的心音分析以及心音图（PCG）信号分析尚未得到广泛认可。这主要是由于关于声音产生的许多争议以及缺乏可靠分析信号特征的定量技术。心音信号所包含的信息远比目前通过人耳评估或目视检查纸上的信号描记所能获取的信息多。在此，我们回顾心音信号的性质以及已应用于PCG分析的各种信号处理技术。还概述了一些新的研究方向。
