利用窗函数设计FIR滤波器，2、　　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。分别采用多尔夫-切比雪夫窗进行设计。-Using window function design FIR filter, 2, design a linear phase finite impulse response low-pass filter to meet the following indicators: pass-band boundary for the 2kHz, stopband border to 2.5kHz, passband ripple = 0.005, resistance band ripple = 0.005, the sampling rate of 10kHz. Were used Dorf- Chebyshev window design.