Comparing two non periodic signals (signal shift)

Hi guys, My name is Salah, I have two non periodic signals and im trying to find the shift between them using matlab. the signals are from spectrometer. I attached excel file that contains two signals and photo for them

Thanks Salah

Answer 1

[Ahmet Cecen]

Import your signals as A and B using the wizard. Also import the time information (x-axis) as T.

 X=(ifft(fft(A).*conj(fft(B))));
 shiftindex=find(X==max(X));
 shift=T(shiftindex)-T(1);  % This is the time value of the shift.

Also check below for a plot of the shifted signal and comparison.

 figure
 plot(A);
 hold on;
 plot(circshift(B,(find(X==max(X)))));

[salah]

I will try it. Thank you Ahmet

[salah]

I tried that but this error appears.

*( Undefined function 'fft' for input arguments of type 'char'.

Error in shift2 (line 9) X=(ifft(fft(A).*conj(fft(B))));)*