firbfilt.asv

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
[y,ft,bits]=wavread('hello.wav');
subplot(2,2,1);
plot(y);
xlabel('Time Index t');
ylabel('Amplitude');
title('原始时域图象');
subplot(2,2,2);
plot(abs(fft(y)));
xlabel('Frequence Index w');
ylabel('Amplitude');
title('原始频域图象');grid;
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);
v=fftfilt(b,y);
subplot(2,1,2);
plot(v);
xlabel('Time Index t');
ylabel('Amplitude');
title('FIR带通滤波时域图象');
sound(v,ft,bits);