Xcorr - plot correlation across time.

Question

Callum Blanchfield 2012-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/37501-xcorr-plot-correlation-across-time

Hi,

I'm very new to Matlab and what i'm trying to do is find the correlation of two separate audio .wav files. At the moment I have the following (x & y are my .wavs):

    C = xcorr(x,y,'coeff');
    ICC = max(abs(C));

This allows me to find the point with the highest correlation, right?

But what I want to do is take a reading of the xcorr or 'C' at 80ms intervals so I can plot the correlation over time, rather than just at one point.

Any ideas?

Thanks in advance.

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RNTL 2012-6-10

but you do have it over time, that's what C means.

and (if both signals have the same sample rate) it is spaced according to the sampling time.

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Answer 1

Wayne King 2012-6-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/37501-xcorr-plot-correlation-across-time#answer_50418

在 MATLAB Online 中打开

   t = 0:0.001:1-0.001;
   x = cos(2*pi*100*t)+randn(size(t));
   y = sin(2*pi*100*t)+randn(size(t));
   [xc,lags] = xcorr(x,y,'coeff');
   stem(lags*0.001,xc);

The above gives the lags as sampling intervals, 0.001 seconds in this example.