IFFTn (FPScript)

21.09.2021

Computes the complex inverse Fourier transform of the argument.

Syntax

IFFTn(Spectrum)

 

The syntax of the IFFTn function consists of the following parts:

Part

Description

Spectrum

The complex Fourier series, which is to be transformed inversely in a complex result.

Permitted data structures are data series, data matrix, signal und signal series. All complex data types are permitted.

For the X component additional restrictions do apply.The values must have a constant non-zero spacing.

Remarks

Spectrum must be the transform of a complex time signal, i.e. it must contain the positive and negative frequencies. If the spectrum that you want to transform originates from a real time signal, then you must use the IRFFTN function. You can find more information under the FFTn function. If Spectrum is a signal or signal series with frequencies in the X component, then these are transformed into the respective time values.

If the argument is a list, then the function is executed for each element of the list and the result is also a list.

Available in

FlexPro Basic, Professional, Developer Suite

Examples

Dim cosine = Signal(Cos(2. * PI * 50 * (1000, 0, 0.001)), (1000, 0, 0.001))
Dim fft = FFTn((cosine, cosine))
IFFTn(fft)
 

Computes the complex inverse Fourier transform of a spectrum. This is the complex cosine signal with the frequency of 50 Hz.

See Also

ApplyWindow Function

DataWindow Function

FFTn Function

FourierSpectrum Function

IRFFTn Function

VarWindow Function

Spectral Analysis Option

Data Tapering Window

Fourier Spectral Analysis

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