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wheres the problem of this fiter code

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elaine
elaine 2014-11-27
关闭： MATLAB Answer Bot 2021-8-20
bb1=[1,-0.9];
imp=1;
M=22;
r=0.9;
l=0:M;
bb2=r.^l;
HH=filter(bb1,1,bb2);
ZZ = filter(HH,1,imp)
nn=0:(length(HH)-1);
stem(nn,ZZ(nn+1));
xlabel('(n)')
ylabel('impulse response')

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Henrik
Henrik 2014-11-27
Without any explanations of your code it's hard to tell, but my guess would be that
ZZ = filter(HH,1,imp)
should be
ZZ = filter(imp,1,HH);
This gives no errors, but I don't know if it's correct.

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