FourierTransform

Full name Microsoft.VisualBasic.Math.SignalProcessing.FFT.FourierTransform Assembly Microsoft.VisualBasic.Math.SignalProcessing Members 7

Fourier transformation.

00 Remarks

The class implements one dimensional and two dimensional Discrete and Fast Fourier Transformation.

01 Syntax

Microsoft.VisualBasic.Math.SignalProcessing.FFT.FourierTransform

02 Methods

Name	Overloads	Summary
DFT	1	One dimensional Discrete Fourier Transform.
DFT2	1	Two dimensional Discrete Fourier Transform.
FFT	1	One dimensional Fast Fourier Transform.
FFT2	1	Two dimensional Fast Fourier Transform.
GetReversedBits	1	Get array, indicating which data members should be swapped before FFT
GetComplexRotation	1	Get rotation of complex number
ReorderData	1	Reorder data for FFT using

03 Members

method DFT #

DFT(Complex(), Direction)

One dimensional Discrete Fourier Transform.

Parameters

Name	Type	Description
`data`	`Complex()`	Data to transform.
`direction`	Direction	Transformation direction.

method DFT2 #

DFT2(Complex[0:,0:], Direction)

Two dimensional Discrete Fourier Transform.

Parameters

Name	Type	Description
`data`	`Complex[0:,0:]`	Data to transform.
`direction`	Direction	Transformation direction.

method FFT #

FFT(Complex(), Direction)

One dimensional Fast Fourier Transform.

Remarks

The method accepts data array of 2n size only, where n may vary in the [1, 14] range.

Parameters

Name	Type	Description
`data`	`Complex()`	Data to transform.
`direction`	Direction	Transformation direction.

method FFT2 #

FFT2(Complex[0:,0:], Direction)

Two dimensional Fast Fourier Transform.

Remarks

The method accepts data array of 2n size only in each dimension, where n may vary in the [1, 14] range. For example, 16x16 array is valid, but 15x15 is not.

Parameters

Name	Type	Description
`data`	`Complex[0:,0:]`	Data to transform.
`direction`	Direction	Transformation direction.

method GetReversedBits #

GetReversedBits(Int32)

Get array, indicating which data members should be swapped before FFT

Parameters

Name	Type	Description
`numberOfBits`	`Int32`	-

method GetComplexRotation #

GetComplexRotation(Int32, Direction)

Get rotation of complex number

Parameters

Name	Type	Description
`numberOfBits`	`Int32`	-
`direction__1`	Direction	-

method ReorderData #

ReorderData(Complex())

Reorder data for FFT using

Parameters

Name	Type	Description
`data`	`Complex()`	-