I am reading a research paper about "narrow" autocorrelation and(adsbygoogle = window.adsbygoogle || []).push({});

at the beginning there is an expression I don't unterstand

http://www.wellesley.edu/Physics/brown/pubs/acv85_P1595-P1601.pdf" [Broken] The autocorrelation function is defined as the product

[tex] g(\tau) = \int\limits_{-\infty}^\infty f(t) \cdot f(t-\tau) dt [/tex]

It is convenient to calculate this as [tex] <|f(t) + f(t-\tau)|^2> [/tex],

where thecross termgives the autocorrelation.

Does someone know what is meant with the word cross term?

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# Cross term gives the autocorrelation?

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