de.gsi.math.spectra.dtft

Class DiscreteTimeFourierTransform

java.lang.Object

de.gsi.math.spectra.dtft.DiscreteTimeFourierTransform

public class DiscreteTimeFourierTransform
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	DEBUG
protected int	START_THREADS

Constructor Summary

Constructors

Constructor and Description
DiscreteTimeFourierTransform()

Method Summary

Modifier and Type	Method and Description
double[]	computeFrequencyRange(double[] time) Compute the optimal frequency and binning range based on the acquisition range (t_max-t_min) and the minimum non-zero sampling distance.
double[]	computeMagnitudeSpectrum(double[] t, double[] val) Discrete Time Fourier Transform computation.
double[]	computeMagnitudeSpectrum(double[] t, double[] val, double[] testFrequencies) Discrete Time Fourier Transform

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

START_THREADS

protected int START_THREADS

DEBUG

protected boolean DEBUG

Constructor Detail

DiscreteTimeFourierTransform

public DiscreteTimeFourierTransform()

Method Detail

computeFrequencyRange

public double[] computeFrequencyRange(double[] time)

Compute the optimal frequency and binning range based on the acquisition range (t_max-t_min) and the minimum non-zero sampling distance.

Parameters:

time - time base vector

Returns:

frequency range vector

computeMagnitudeSpectrum

public double[] computeMagnitudeSpectrum(double[] t,
                                         double[] val)

Discrete Time Fourier Transform computation. The maximum frequency and binning is derived from the acquisition range (t_max-t_min) and the minimum non-zero sampling distance.

Parameters:

t - the time indices

val - the measurement

Returns:

array containing magnitude spectrum

computeMagnitudeSpectrum

public double[] computeMagnitudeSpectrum(double[] t,
                                         double[] val,
                                         double[] testFrequencies)

Discrete Time Fourier Transform

Parameters:

t - the time indices

val - the measurement

testFrequencies - array containing the frequencies for which the spectra is being evaluated

Returns:

array containing magnitude spectrum