Autocorrelation and Alignment

2011 12 16
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I have a speech signal with 18000 samples. Call this the original signal. Also, I have the same speech signal with a time delay. Now, the task I need to achieve is to auto correlate the signals and align the signal to the original signal time index.
Can you please help me with it. Thank you.

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Abhishek Gupte
Abhishek Gupte 2011-12-16

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1. Use XCORR in the Signal Processing Toolbox to find the correlation between the two signals;
2. Find the index of the max value of the correlation output - n;
3. If L is the length of the two signals, the delay between the two signals is abs( n-L ).

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Dinesh Manohar
Dinesh Manohar 2011-12-16

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I have an extended question pertaining to the same topic.
I have a signal say , x and I have another signal say y which is y= x(l:m), where min(size(x))<l<m< max(size(x)). That is , I have a part of the signal. Now, I correlated the function and plotted it. I got a max of the plot at some index and the plot gradually started decreasing over increase in time index. Now, as per your comment, it means to say that the signal y is correlated in that lag shown by the plot? Please help me in this regard.
Thank you.

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