Click or drag to resize

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: 7.3
Syntax
[SerializableAttribute]
public class DoubleSymmetricBackward1DFFT : FFTBase, 
	ICloneable

The DoubleSymmetricBackward1DFFT type exposes the following members.

Constructors
  NameDescription
Public methodDoubleSymmetricBackward1DFFT(Int32)
Constructs a backward 1D FFT instance for double real signal vectors.
Public methodDoubleSymmetricBackward1DFFT(FFTBase)
Constructs a backward 1D FFT instance by copying the configuration from another FFT instance.
Top
Properties
  NameDescription
Public propertyBackwardScaleFactor
Gets or sets the backward scale factor of the FFT; The default is 1.0
Public propertyDimension
Gets the FFT dimension.
(Inherited from FFTBase.)
Public propertyDirection
Gets the direction of the FFT, either forward or backward.
(Inherited from FFTBase.)
Public propertyDomain
Gets the forward domain of signal data; either complex or real.
(Inherited from FFTBase.)
Public propertyLength
Gets the length of the signal data.
(Inherited from FFTBase.)
Public propertyPrecision
Gets the FFT precision; either float or double
(Inherited from FFTBase.)
Top
Methods
  NameDescription
Public methodClone
Creates a deep copy of this FFT instance.
Public methodCreateInverseFFT
Creates a backward FFT instance of this backward double real 1D FFT.
Public methodFFT(Double, Double)
Computes the out-of-place backward FFT of vin and places the result in vout
Public methodFFT(DoubleVector, DoubleVector)
Computes the out-of-place backward FFT of vin and places the result in vout
Public methodFFT(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.
Public methodFFTInPlace(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.
Public methodFFTInPlace(Double)
Computes the in-place backward FFT of the signal vinout.
Public methodFFTInPlace(DoubleVector)
Computes the in-place backward FFT of the signal vinout.
Public methodFFTInPlace(Double, Int32)
Computes the in-place backward FFT of the signal vinout.
Public methodFFTInPlaceArray
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.
Public methodSetScaleFactorByLength
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.
Public methodToString
Returns a String containing a summary of this FFT type.
(Inherited from FFTBase.)
Top
Fields
  NameDescription
Protected fieldipconfig_
In-place FFT configuration.
(Inherited from FFTBase.)
Protected fieldofpconfig_
Out-of-place FFT configuration.
(Inherited from FFTBase.)
Top
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.
See Also