带通/带阻巴特沃斯滤波器设计，采用IIR滤波器设计思路，可以返回数字滤波器的二阶分割形式-Band-pass/band-reject Butterworth filter design, using IIR filter design ideas, you can return to the form of digital filter second-order segmentation

matlab程序滤波器,有IIR各种滤波器，可以实现低通，高通，带通，带阻等滤波器-matlab program filters, there are various IIR filters can achieve a low pass, high pass, band pass, band stop filter

FIR滤波器， 设计一个线性相位有限冲激响应低通滤波器，使其满足如下指标：通带边界为2kHz，阻带边界为2.5kHz，通带波纹 =0.005，阻带波纹 =0.005，抽样率为10kHz。采用多尔夫-切比雪夫窗进行设计，进行频谱分析。-FIR filter, design a linear phase FIR low-pass filter to meet the following indicators: passband border to 2kHz, stopband border to 2

五阶椭圆滤波器综合设计。具有1dB通带波纹，和一个最小20dB的阻带衰减。-Fifth-order elliptic filter integrated design. With 1dB passband ripple, and a minimum stopband attenuation of 20dB.