MATLAB: Cross correlation problem..

cross correlation

Hey every1..

I have two signals they identical but one is delayed with some time D and I am trying to use cross correlation to find out the delay time.. It should return the time I used to delay the Signal.. I am stuck with this and don't know how to sort it out .. read couple of articles and It didn't work.. I know there is an in-built function in Matlab to help this but yet couldn't manage to make it work either.. [lag,criterion] = delay(x,y)

I know lag should be the delay I given e.g lag = 3 and the delay function should return 3 at the end and x,y should be my two signals??

Any ideas how to solve this problem..?

Best Answer

Hi Susan,

I guess you are looking for the xcorr function from Signal Processing Toolbox ...

Titus

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MATLAB: Features selection problem..

What you are asking is not, in general, feasible.

How many reference values are used for each decision?

Assume there are two reference values and three original inputs. Then what you are asking for is equivalent to training with a 5-dimensional input and testing with only three of the inputs.

Hope this helps.

Greg

MATLAB: Delay using Cross correlation

The output of xcorr is an array of values of how one array is similar to the other. The maximum value is when two arrays match the most. Find the place (position) of the maximum value in the array (you can look it up from the variable editor, or use built-in functions such as 'find' and 'max', I don't remember exactly). So, if your max value is at position 25, it means that the delay is 25. Also, I am not sure if it matters, but make sure to feed the xcorr function, so the shorter array slides against longer (at least it make sense analytically). Not sure if this will work, but the idea is here:

cor=xcorr(shortArray,longArray);
[~,index]=max(cor);

where 'index' should be the position of the max value as well as the delay index. So, first 25 values must be skipped from the longer array

Best Answer

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MATLAB: Delay using Cross correlation

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