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Notice: The peak of the function =1 (its an autocorrelation) - PowerPoint PPT Presentation


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Autocorrelation calculated by :. Notice: The peak of the function =1 (its an autocorrelation) The triangular shape is a result of zero padding The secondary peaks mean the signal has some repetition. retinal ganglion cell responses to a fluctuating light stimulus.

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Presentation Transcript
slide1

Autocorrelation calculated by:

  • Notice:
  • The peak of the function =1
  • (its an autocorrelation)
  • The triangular shape is a result of zero padding
  • The secondary peaks mean the signal has some repetition
the peaks of the cross correlation functions using matlab s xcorr
The peaks of the cross correlation functions using Matlab’s “xcorr”

Offt, On

Offs, On

cross correlation coefficient

Offs, Offt

Offt, Offs

Time (ms)

slide4

Using the Fourier transform to calculate the cross correlation

A = fft (signal a)

B = fft (signal b)

Fourier Cross Correlation = ifft(A*conj(B))