edu.cmu.sphinx.frontend.denoise

Class Denoise

java.lang.Object

edu.cmu.sphinx.util.props.ConfigurableAdapter

edu.cmu.sphinx.frontend.BaseDataProcessor

edu.cmu.sphinx.frontend.denoise.Denoise

All Implemented Interfaces:

DataProcessor, Configurable

public class Denoise
extends BaseDataProcessor

The noise filter, same as implemented in sphinxbase/sphinxtrain/pocketsphinx. Noise removal algorithm is inspired by the following papers Computationally Efficient Speech Enchancement by Spectral Minina Tracking by G. Doblinger Power-Normalized Cepstral Coefficients (PNCC) for Robust Speech Recognition by C. Kim. For the recent research and state of art see papers about IMRCA and A Minimum-Mean-Square-Error Noise Reduction Algorithm On Mel-Frequency Cepstra For Robust Speech Recognition by Dong Yu and others

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	LAMBDA_A
static java.lang.String	LAMBDA_B
static java.lang.String	LAMBDA_POWER
static java.lang.String	LAMBDA_T
static java.lang.String	MAX_GAIN
static java.lang.String	MU_T
static java.lang.String	SMOOTH_WINDOW

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

logger

Constructor Summary

Constructors

Constructor and Description
Denoise()
Denoise(double lambdaPower, double lambdaA, double lambdaB, double lambdaT, double muT, double maxGain, int smoothWindow)

Method Summary

Modifier and Type	Method and Description
Data	getData() Returns the processed Data output.
void	newProperties(PropertySheet ps) This method is called when this configurable component needs to be reconfigured.

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

getPredecessor, initialize, 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

Field Detail

LAMBDA_POWER

@S4Double(defaultValue=0.7)
public static final java.lang.String LAMBDA_POWER

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Constant Field Values

LAMBDA_A

@S4Double(defaultValue=0.995)
public static final java.lang.String LAMBDA_A

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Constant Field Values

LAMBDA_B

@S4Double(defaultValue=0.5)
public static final java.lang.String LAMBDA_B

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Constant Field Values

LAMBDA_T

@S4Double(defaultValue=0.85)
public static final java.lang.String LAMBDA_T

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Constant Field Values

MU_T

@S4Double(defaultValue=0.2)
public static final java.lang.String MU_T

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Constant Field Values

MAX_GAIN

@S4Double(defaultValue=20.0)
public static final java.lang.String MAX_GAIN

See Also:

Constant Field Values

SMOOTH_WINDOW

@S4Integer(defaultValue=4)
public static final java.lang.String SMOOTH_WINDOW

See Also:

Constant Field Values

Constructor Detail

Denoise

public Denoise(double lambdaPower,
               double lambdaA,
               double lambdaB,
               double lambdaT,
               double muT,
               double maxGain,
               int smoothWindow)

Denoise

public Denoise()

Method Detail

newProperties

public void newProperties(PropertySheet ps)
                   throws PropertyException

Description copied from interface: Configurable

This method is called when this configurable component needs to be reconfigured.

Specified by:

newProperties in interface Configurable

Overrides:

newProperties in class ConfigurableAdapter

Parameters:

ps - a property sheet holding the new data

Throws:

PropertyException - if there is a problem with the properties.

getData

public Data getData()
             throws DataProcessingException

Description copied from class: BaseDataProcessor

Returns the processed Data output.

Specified by:

getData in interface DataProcessor

Specified by:

getData in class BaseDataProcessor

Returns:

an Data object that has been processed by this DataProcessor

Throws:

DataProcessingException - if a data processor error occurs