edu.cmu.sphinx.frontend.transform

Class KaldiDiscreteCosineTransform

java.lang.Object

edu.cmu.sphinx.util.props.ConfigurableAdapter

edu.cmu.sphinx.frontend.BaseDataProcessor

edu.cmu.sphinx.frontend.transform.DiscreteCosineTransform

edu.cmu.sphinx.frontend.transform.KaldiDiscreteCosineTransform

All Implemented Interfaces:

DataProcessor, Configurable

public class KaldiDiscreteCosineTransform
extends DiscreteCosineTransform

DCT implementation that conforms to one used in Kaldi.

Field Summary

Fields inherited from class edu.cmu.sphinx.frontend.transform.DiscreteCosineTransform

cepstrumSize, melcosine, numberMelFilters, PROP_CEPSTRUM_LENGTH, PROP_NUMBER_FILTERS

Fields inherited from class edu.cmu.sphinx.util.props.ConfigurableAdapter

logger

Constructor Summary

Constructors

Constructor and Description
KaldiDiscreteCosineTransform()
KaldiDiscreteCosineTransform(int numberMelFilters, int cepstrumSize)

Method Summary

Modifier and Type	Method and Description
protected double[]	applyMelCosine(double[] melspectrum) Apply the MelCosine filter to the given melspectrum.
protected void	computeMelCosine() Compute the MelCosine filter bank.

Methods inherited from class edu.cmu.sphinx.frontend.transform.DiscreteCosineTransform

getData, initialize, newProperties

Methods inherited from class edu.cmu.sphinx.frontend.BaseDataProcessor

getPredecessor, setPredecessor

Methods inherited from class edu.cmu.sphinx.util.props.ConfigurableAdapter

getName, initLogger, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

KaldiDiscreteCosineTransform

public KaldiDiscreteCosineTransform(int numberMelFilters,
                                    int cepstrumSize)

KaldiDiscreteCosineTransform

public KaldiDiscreteCosineTransform()

Method Detail

computeMelCosine

protected void computeMelCosine()

Description copied from class: DiscreteCosineTransform

Compute the MelCosine filter bank.

Overrides:

computeMelCosine in class DiscreteCosineTransform

applyMelCosine

protected double[] applyMelCosine(double[] melspectrum)

Description copied from class: DiscreteCosineTransform

Apply the MelCosine filter to the given melspectrum.

Overrides:

applyMelCosine in class DiscreteCosineTransform

Parameters:

melspectrum - the MelSpectrum data

Returns:

MelCepstrum data produced by apply the MelCosine filter to the MelSpectrum data