男女生识别、文字端点检测
sgn.m是判断符号的函数
在使用GUI时输入的数字必须为英文状态下（搜狗输入法英文）
端点检测和基频计算是在GUI
m文件转到GUI中，基本没什么变化，主要就是使用了全局变量。(Gender recognition and text endpoint detection

SGN. M is a function of judging signs

When using GUI, the input number must be in English

Endpoint detection and fundamental frequency calculation are in GUI

The m file is transferred to the GUI. Basically, there is no change. The main thing is to use global variables.)