expected value formula in xcorr

조회 수: 3 (최근 30일)
SYML2nd
SYML2nd 2019년 7월 9일
답변: Navya Seelam 2019년 7월 17일
Hi all,
when I use the xcorr, the formula used in matlab is C(m) = E[A(n+m)*conj(B(n))] = E[A(n)*conj(B(n-m))] where E is the expected value.
I have seen that matlab does not have a function $expected value", so I was wandering which is the real formula behind xcorr.
Thank you in advance
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Star Strider
Star Strider 2019년 7월 9일
It appears to be the summation right below that, in the More About section.
Bjorn Gustavsson
Bjorn Gustavsson 2019년 7월 9일
In my (oldish) version of matlab the xcorr function is a regular .m-file open for inspection. The heavy lifting is done by fft-ifft.

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답변 (1개)

Navya Seelam
Navya Seelam 2019년 7월 17일
Hi,
By default, xcorr computes raw correlations by summation with no normalization.
For more details on working of “xcorr” here:

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