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Cross-correlation for signal matches

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Steven Chong
Steven Chong on 23 Jun 2015
How can i cross-correlate two different signals to determine whether they are matched by frequency. In depth of my question is that the signals will cross-correlate their frequencies and when contain same frequency then the product will have high amplitude and vice versa

Answers (1)

Salaheddin Hosseinzadeh
Salaheddin Hosseinzadeh on 23 Jun 2015
Edited: Salaheddin Hosseinzadeh on 23 Jun 2015
Dear Steven,
Here is a example code i used to find the phase-shift between two different signals. I used cross-correlation to determine the phase shift.
In line 26 you can see the crosscorr() function which performs, well of course you know what that does ;)
Hope this helps. If you made the code any better share it with me plz.
Good luck ;)
  3 Comments
Salaheddin Hosseinzadeh
Salaheddin Hosseinzadeh on 24 Jun 2015
crosscorr(x,y), generates an output signal which has its peak where the two signals have the most relation. They may not neccesarily match!
You can compare the audio signal in time domain using crosscorr(), or, first take their Fourier transform (fft()) and compare their frequency spectrum, this is up to you.
I assume if two signals are similar in time domain, they will be similar in frequency domain as well.
This is what I understand at least!
Good luck.

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