corr_signal.m文件可以通过自相关运算，将文件名为test的语音文件的音阶读出。
work1.m是一个GUI函数，图形化界面检测test.wav的音阶。
可用作展示自相关简单应用的过程。(The corr_signal.m file can read the phonetic order of the voice file named test by autocorrelation operation.
Work1.m is a GUI function, the graphical interface detects the scale of the test.wav.
It can be used as a process to show the simple application of autocorrelation.)