butterhfilt.m

使用Matlab实现了FIR与IIR滤波器

function [ output_args ] = Untitled3( input_args )
%UNTITLED3 Summary of this function goes here
%  Detailed explanation goes here
[y,ft,bits]=wavread('hello.wav');
subplot(2,1,1);
plot(y);
xlabel('Time Index t');
ylabel('Amplitude');
title('原始时域图象');
Wp =2*5000/ft;
Ws = 2*4800/ft;
Rp = 1;
Rs = 100;
[N,Wn] = buttord(Wp,Ws,Rp,Rs);
[b,a] = butter(N,Wn,'high');
v=filter(b,a,y);
subplot(2,1,2);
plot(v);
xlabel('Time Index t');
ylabel('Amplitude');
title('BUTTER高通滤波时域图象');
sound(v,ft,bits);