compute the ideal impulse

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Carlos Castillo
Carlos Castillo 2013-12-1
回答： Youssef Khmou 2013-12-1
trying to calculate the window functions for use in filter design but I get an error when the command ideallp(omc,M) is use there is an error received. Please advise. Thank you
EDU>> wp=0.25*pi;
ws=0.35*pi;
Ap=0.1; As=50;
deltap=(10^(Ap/20)-1)/(10^(Ap/20)+1);
deltas=(1+deltap)/(10^(As/20));
delta=min(deltap, deltas); A=-20*log10(delta);
Deltaw=ws-wp; omc=(ws+wp)/2;
L=ceil(6.6*pi/Deltaw)+1; M=L-1; %Window length and order
n=0:M; hd=ideallp(omc,M);
h=hd.*hamming(L)';
Undefined function 'ideallp' for input arguments of type 'double'.

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回答（2 个）

Matt J
Matt J 2013-12-1
ideallp doesn't appear to be a stock MATLAB function. Execute the following
>> which ideallp
to see if you even have it.
Youssef Khmou
Youssef Khmou 2013-12-1
try this function :
function F = ideallp(wc,N);
t = (N-1)/2;
x = [0: (N-1)];
m = x - t + eps;
F = sin(wc*m) ./ (pi*m);

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