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Built-in Mathematica Symbol

FourierParameters

FourierParameters
is an option to Fourier and related functions that specifies the conventions to use in computing Fourier transforms.

Some common choices for {a, b} are {0, 1} (default), {-1, 1} (data analysis), {1, -1} (signal processing).

Use a non-default definition of the discrete Fourier transform:

A non-default definition used for the continuous Fourier transform: