DoubleSymmetricBackward1DFFT Class

DoubleSymmetricBackward1DFFT represents the backward discrete fourier transform of a 1D real signal vector, and inverses packed conjugate symmetric signals back to the real domain.

Inheritance Hierarchy

SystemObject
CenterSpace.NMath.CoreFFTBase
CenterSpace.NMath.CoreDoubleSymmetricBackward1DFFT

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4

Syntax

C++

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[SerializableAttribute]
public class DoubleSymmetricBackward1DFFT : FFTBase, 
	ICloneable

<SerializableAttribute>
Public Class DoubleSymmetricBackward1DFFT
	Inherits FFTBase
	Implements ICloneable

[SerializableAttribute]
public ref class DoubleSymmetricBackward1DFFT : public FFTBase, 
	ICloneable

[<SerializableAttribute>]
type DoubleSymmetricBackward1DFFT = 
    class
        inherit FFTBase
        interface ICloneable
    end

The DoubleSymmetricBackward1DFFT type exposes the following members.

Constructors

	Name	Description
	DoubleSymmetricBackward1DFFT(FFTBase)	Constructs a backward 1D FFT instance by copying the configuration from another FFT instance.
	DoubleSymmetricBackward1DFFT(Int32)	Constructs a backward 1D FFT instance for double real signal vectors.

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Properties

	Name	Description
	BackwardScaleFactor	Gets or sets the backward scale factor of the FFT; The default is 1.0
	Dimension	Gets the FFT dimension. (Inherited from FFTBase)
	Direction	Gets the direction of the FFT, either forward or backward. (Inherited from FFTBase)
	Domain	Gets the forward domain of signal data; either complex or real. (Inherited from FFTBase)
	Length	Gets the length of the signal data. (Inherited from FFTBase)
	Precision	Gets the FFT precision; either float or double (Inherited from FFTBase)

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Methods

	Name	Description
	Clone	Creates a deep copy of this FFT instance.
	CreateInverseFFT	Creates a backward FFT instance of this backward double real 1D FFT.
	FFT(Double, Double)	Computes the out-of-place backward FFT of vin and places the result in vout
	FFT(DoubleVector, DoubleVector)	Computes the out-of-place backward FFT of vin and places the result in vout
	FFT(Double, Int32, Double)	Computes the backward out-of-place FFT of vin and places the result in vout, where vin and vout contain offset signal data, vinoffset, voutoffset, respectively, from the [0] element.
	FFTInPlace(Double)	Computes the in-place backward FFT of the signal vinout.
	FFTInPlace(Double)	Obsolete. Computes the backward FFT of each row in arrayinout and returns the complex conjugate symmetric results in-place in a packed format. Use a DoubleSymmetricSignalReader instance to extract individual signal FFT's out of the resultant array.
	FFTInPlace(DoubleVector)	Computes the in-place backward FFT of the signal vinout.
	FFTInPlace(Double, Int32)	Computes the in-place backward FFT of the signal vinout.
	FFTInPlaceArray	Computes the backward FFT of each row in arrayinout and returns the complex conjugate symmetric results in-place in a packed format. Use a DoubleSymmetricSignalReader instance to extract individual signal FFT's out of the resultant array.
	SetScaleFactorByLength	Sets the backward FFT scale factor to 1/SignalLength. If the forward FFT scale factor is 1.0, using this backward scale factor will guarentee that backwardFFT(forwardFFT(signal)) = signal. MATLAB uses this scale factor by default.
	ToString	Returns a String containing a summary of this FFT type. (Inherited from FFTBase)

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Fields

	Name	Description
	ipconfig_	In-place FFT configuration. (Inherited from FFTBase)
	ofpconfig_	Out-of-place FFT configuration. (Inherited from FFTBase)

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Remarks

The class DoubleForward1DFFT creates packed conjugate symmetric signals, and it is these signals that are reversed by this class. The backward FFT is defined to have a negative exponent in the transform with a default scale factor of 1.0. To gain greater efficiency in transforming sets of same-length signals, first arrange signals row-by-row in an array, and then use the FFTInPlace(double[,] arrayinout) method.

Reference

CenterSpace.NMath.Core Namespace