用matlab实现巴特沃斯高通滤波器的M文件。本例读取电脑自带的XP开机声音，加上低频噪声，然后滤波看效果。-With Matlab M-file Butterworth high-pass filter. This case, read the computer comes with XP start-up sound, coupled with the low-frequency noise, and then filtering to see results.