jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
87 lines
1.4 KiB
Matlab
Executable File
87 lines
1.4 KiB
Matlab
Executable File
% pfftcnv2(x,b)
|
|
function y = pfftcnv2(x,h,P,S,L)
|
|
|
|
N = length(h);
|
|
Lx = length(x);
|
|
C = 2^ceil(log(L+S*L-1)/log(2));
|
|
Np = S*L;
|
|
K = Lx/L;
|
|
|
|
y = zeros(1,Lx);
|
|
hp = zeros(P,C);
|
|
Hp = zeros(P,C);
|
|
xk = zeros(1,C);
|
|
Xk = zeros(1,C);
|
|
Xkps = zeros(S*P,C);
|
|
yk = zeros(1,C);
|
|
Y = zeros(1,C);
|
|
xzp = zeros(1,Lx+C-L);
|
|
pidTbl = [2:P*S];
|
|
pidTbl(P*S) = 1;
|
|
pStbl = [0:P*S-1];
|
|
pStbl(1) = 10;
|
|
|
|
pid = 1;
|
|
|
|
% h(k) => hp(k)
|
|
for p=1:P,
|
|
SLp = (p-1)*Np;
|
|
hp(p,1:Np) = h(SLp+1:SLp+Np);
|
|
end;
|
|
|
|
% hp(k) => Hp(k)
|
|
for p=1:P,
|
|
Hp(p,1:C) = fft(hp(p,1:C),C);
|
|
end;
|
|
|
|
xzp(C-L+1:Lx+C-L) = x;
|
|
|
|
tic;
|
|
|
|
for k=1:K,
|
|
|
|
kL = (k-1)*L;
|
|
xk(1:C) = xzp(kL+1:kL+C);
|
|
|
|
Xkps(pid,1:C) = fft(xk,C);
|
|
|
|
pS = pid;
|
|
Y = Hp(1,1:C).*Xkps(pid,1:C);
|
|
for p=2:P,
|
|
for i = 1:S
|
|
pS = pStbl(pS);
|
|
end;
|
|
Y = Y + Hp(p,1:C).*Xkps(pS,1:C);
|
|
end;
|
|
|
|
yk = ifft(Y,C);
|
|
|
|
y(kL+1:kL+L) = yk(C-L+1:C);
|
|
|
|
pid = pidTbl(pid);
|
|
|
|
end;
|
|
toc;
|
|
|
|
SUBPLOT(2,1,1),
|
|
plot(1:N,h);
|
|
n = [1:N];
|
|
XT = [Np*n];
|
|
set(gca,'XTick',XT);
|
|
grid;
|
|
PlotTitle = sprintf('Filterkoeffizienten h(n), N=%d, P=%d, S=%d, NP=%d',N,P,S,Np);
|
|
title(PlotTitle);
|
|
xlabel('n');
|
|
ylabel('h');
|
|
|
|
SUBPLOT(2,1,2),
|
|
plot(1:K*L,real(y(1:K*L)));
|
|
n = [1:N];
|
|
XT = [L*n];
|
|
set(gca,'XTick',XT);
|
|
grid;
|
|
PlotTitle = sprintf('Filterausgang y(n), K=%d, L=%d, C=%d',K,L,C);
|
|
title(PlotTitle);
|
|
xlabel('n');
|
|
ylabel('y');
|