录制语音信号， 编写 matlab 代码分析所录制的语音信号， 观察语音信号中蕴含的 alpha 分布， 并进行 alpha 分布的拟合， 对语音信号及其 alpha 特征进行分析(Record speech signals, write matlab code to analyze the recorded speech signals, observe the alpha distribution contained in the speech signals, and fit the a