Aplicaciones de Filtros Digitales

• Decimación

• >> N=50;n=0:N-1;M=6;Nf=30;nf=Nf/2;

• >> x = sin(2*pi*0.042*n) + sin(2*pi*0.033*n);

• % Filtro pasobajo frecuencia de corte pi/6 --> 1/12

• >> B=fir1(Nf,1/6);

• >> [H,F]=freqz(B,1,250,1);

• >> xd = filter(B,1,x);

• % Eliminar el retraso

• >> xd(1:N-nf) = xd(nf+1:N);xd(N-nf+1:N)=zeros(1,nf);

• % Generar la secuencia de down-sampler

• >> y = xd(1:M:N-1);lxd=length(y);

• >> figure;plot(n,x,'r',n,xd,'g');

• >> figure;stem([1:lxd],y);

• >> figure;semilogy(F,abs(H));

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