?? dftf.m
字號(hào):
function DFTF
% Program to compute DFT coefficients using DIT FFT
% (Program 3c.2, p171; program name: dftf.m)
%
clear all;
direction = -1; %1 - forward DFT, -1 - inverse DFT
in = fopen('dataout.dat','r');
x = fscanf(in,'%g %g',[2,inf]);
fclose(in);
x = x(1,:)+x(2,:)*i; % form complex numbers
if direction==1
y=fft(x,length(x)) % compute FFT
else
y=ifft(x,length(x)) % compute IFFT
end
% Save/Print the results
out=fopen('dataout.dat','w');
fprintf(out,'%g %g\n',[real(y); imag(y)]);
fclose(out);
subplot(2,1,1),plot(1:length(x),x); title('Input Signal');
subplot(2,1,2),plot(1:length(y),y); title('Output Signal');
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