中文说明：
本文综述了心音检测技术以及现代数字信号处理方法(谱估计、联合时一频分析、小波分析、模式识别)在心音信号分析中的应用及研究进展。
English Description：
This paper reviews the application and research progress of heart sound detection technology and modern digital signal processing methods (spectrum estimation, joint time-frequency analysis, wavelet analysis, pattern recognition) in heart sound signal analysis.