# Dictionary:Crosscorrelation theorem

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The Fourier transform of the crosscorrelation of *g*_{1}(*t*) and *g*_{2}(*t*) is

where are the Fourier transforms of , and the superscribed bar indicates a complex conjugate. Here is called the **cross-energy spectrum**. See Figure F-22 and Sheriff and Geldart (1995, 285, 538, and 541-542) ^{[1]}.

## References

- ↑ Sheriff, R. E. and Geldart, L. P., 1995, Exploration Seismology, 2nd Ed., Cambridge Univ. Press.