firb.m

使用Matlab实现了FIR与IIR滤波器

function [ output_args ] = Untitled1( input_args )
%UNTITLED1 Summary of this function goes here
%  Detailed explanation goes here
ft=22050;
fcuts=[1000 1200 3000 3200];
mags = [0 1 0];
devs = [10^(-100/20),(1-10^(-1/20)),10^(-100/20)];
[N,Wn,beta,ftype] = kaiserord(fcuts,mags,devs,ft);
kw = kaiser(N+1,beta);
b = fir1(N,Wn,kw);
[h,w] = freqz(b,1);
plot(w/pi,20*log10(abs(h)));grid;
xlabel('w/pi'); ylabel('Gain, dB');
title('Fir Bandpass Filter');