edu.cmu.sphinx.frontend.feature

Class BatchVarNorm

java.lang.Object

edu.cmu.sphinx.util.props.ConfigurableAdapter

edu.cmu.sphinx.frontend.BaseDataProcessor

edu.cmu.sphinx.frontend.feature.BatchVarNorm

All Implemented Interfaces:

DataProcessor, Configurable

public class BatchVarNorm
extends BaseDataProcessor

Applies cepstral variance normalization (CVN), so that each coefficient will have unit variance. You need to put this element after the means normalizer in frontend pipeline.

CVN is sited to improve the stability of the decoding with the additive noise, so it might be useful in some situations.

See Also:

LiveCMN

Field Summary

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

logger

Constructor Summary

Constructors

Constructor and Description
BatchVarNorm()

Method Summary

Modifier and Type	Method and Description
Data	getData() Returns the next Data object, which is a normalized cepstrum.
void	initialize() Initializes this BatchCMN.
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, 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

BatchVarNorm

public BatchVarNorm()

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.

initialize

public void initialize()

Initializes this BatchCMN.

Specified by:

initialize in interface DataProcessor

Overrides:

initialize in class BaseDataProcessor

getData

public Data getData()
             throws DataProcessingException

Returns the next Data object, which is a normalized cepstrum. Signal objects are returned unmodified.

Specified by:

getData in interface DataProcessor

Specified by:

getData in class BaseDataProcessor

Returns:

the next available Data object, returns null if no Data object is available

Throws:

DataProcessingException - if there is an error processing data