利用高通、低通、带通、带阻等滤波器对信号进行处理，滤除噪声，获得想要的信号。-Using high-pass, low pass, band pass, band stop filter such as signal processing, filtering noise, obtain the desired signal.

Matlab产生高通、带通、带阻滤波器方法，希望对刚接触滤波器的初学者有帮助！-Matlab produce high pass, band pass, band stop filter method, and I hope to help beginners new to the filter!