巴特沃斯和切比雪夫低、带通滤波器matlab程序，能播放、读取音乐，加噪，滤噪等。画出加噪前、加噪后、滤波后波形。-Butterworth and Chebyshev low, band-pass filter matlab procedures, can play music, reading, adding noise, filtering etc.. Before the addition of noise, plus noise, after the filter waveform.