elliplfilt.m

使用Matlab实现了FIR与IIR滤波器

function [ output_args ] = Untitled4( input_args )
%UNTITLED4 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');grid;
subplot(2,2,2);
plot(abs(fft(y)));
xlabel('Frequence Index w');
ylabel('Amplitude');
title('原始频域图象');grid;
Wpl=2*1000/ft;
Wsl=2*1200/ft;
Rp = 1;
Rs = 100;
[Nl,Wnl] = ellipord(Wpl,Wsl,Rp,Rs);
[bl,al] = ellip(Nl,Rp,Rs,Wnl,'low');
vl=filter(bl,al,y);
subplot(2,2,3);
plot(vl);
xlabel('Time Index t');
ylabel('Amplitude');
title('ELLIP低通滤波时域图象');grid;
subplot(2,2,4);
plot(abs(fft(vl)));
xlabel('Frequence Index w');
ylabel('Amplitude');
title('低通滤波后频域图象');grid;
sound(vl,ft,bits);