xcorr

Hi

   Could you please tell me how to understand the delay from the output of the numbers in the below program being displayed? I know the concept of xcorr. I am new to matlab, please help me get through this.

fs=100 t = 0:1/fs:1; x = sin(2*pi*t); y = sin(2*pi*t+pi/10); plot(t,x,t,y) [c, lags] = xcorr(x,y)

Thanks in advance

Answer 1

[Wayne King]

The frequency of your inputs is 1 Hz, or 2*pi radians per second

The phase lag is pi/10 radians, which corresponds to

pi/10*(1/(2*pi)) seconds. That is 5 sample points at your sampling frequency.

Look at c for c(101:110) which corresponds to lags 0 to 10. See that the maximum value occurs at lag 5, which corresonds to 0.05 seconds as expected.