jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
52 lines
801 B
Matlab
Executable File
52 lines
801 B
Matlab
Executable File
% pfftfilt(x,b)
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function y = pfftfilt(x,h,P,S,L)
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N = length(h);
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Lx = length(x);
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C = 2^ceil(log(L+S*L-1)/log(2));
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Np = S*L;
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K = Lx/L;
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y = zeros(Lx,1);
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Hp = zeros(C,P);
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Xkps = zeros(C,S*P);
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yk = zeros(C,1);
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Y = zeros(C,1);
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xzp = zeros(Lx+C-L,1);
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pidTbl = [2:P*S];
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pidTbl(P*S) = 1;
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pStbl = [0:P*S-1];
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pStbl(1) = 10;
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pid = 1;
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% h(k) => Hp(k)
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for p=1:P,
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Hp(1:C,p) = fft([h((p-1)*Np+1:p*Np);zeros(C-Np,1)],C);
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end;
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xzp(C-L+1:Lx+C-L) = x;
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for k=1:K,
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kL = (k-1)*L;
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Xkps(1:C,pid) = fft(xzp(kL+1:kL+C),C);
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pS = pid;
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Y = Hp(1:C,1).*Xkps(1:C,pid);
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for p=2:P,
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for i = 1:S
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pS = pStbl(pS);
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end;
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Y = Y + Hp(1:C,p).*Xkps(1:C,pS);
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end;
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yk = ifft(Y,C);
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y(kL+1:kL+L) = yk(C-L+1:C);
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pid = pidTbl(pid);
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end;
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