本课题研究设计了一个图形用户界面（Graphical User Interface，简称 GUI，又称图形用户接口），用以调用显示出心音信号的时域波形、频域波形、能量分布、心率以及一些特征信息。-This paper has designed a graphical user interface (Graphical User Interface, referred to as GUI, also known as the graphical user interface),which used