# Difference between revisions of "Dictionary:Cross-spectrum"

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The expression of the mutual frequency properties of two time functions or series. The cross-spectrum is in general a complex-valued function and hence involves a pair of real relationships; such as the amplitude and phase as functions of frequency. The real part of the cross-spectrum is also called the <b>cospectrum</b> and the imaginary part the <b>quadrature spectrum</b>. | The expression of the mutual frequency properties of two time functions or series. The cross-spectrum is in general a complex-valued function and hence involves a pair of real relationships; such as the amplitude and phase as functions of frequency. The real part of the cross-spectrum is also called the <b>cospectrum</b> and the imaginary part the <b>quadrature spectrum</b>. | ||

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## Revision as of 10:06, 8 November 2018

The expression of the mutual frequency properties of two time functions or series. The cross-spectrum is in general a complex-valued function and hence involves a pair of real relationships; such as the amplitude and phase as functions of frequency. The real part of the cross-spectrum is also called the **cospectrum** and the imaginary part the **quadrature spectrum**.