# Translations:Dictionary:Instantaneous frequency/2/en

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The instantaneous frequency is a seismic attribute, which is defined to be the time rate of change of the *instantaneous phase*. Computationally it is preferable to compute the time rate of change as the derivative of the arctangent function to avoid discontinuities. The computed output is given in units of cycles per second. Instantaneous frequencies are influenced by the bed thickness and we wish to observe them without too much interference. This is accomplished by using several adjacent traces to form a consistent output. It has been shown than instantaneous frequency, computed as the time derivative of *instantaneous phase* relates the the centroid of the power spectrum of the seismic wavelet. ^{[1]}

- ↑ Taner, Turhan (1992), Attributes Revisited, Rock Solid Images Houston, Texas (published 2000)