edu.cmu.sphinx.frontend.feature
Class AbstractFeatureExtractor

java.lang.Object
  edu.cmu.sphinx.util.props.ConfigurableAdapter
      edu.cmu.sphinx.frontend.BaseDataProcessor
          edu.cmu.sphinx.frontend.feature.AbstractFeatureExtractor

All Implemented Interfaces:

DataProcessor, Configurable

Direct Known Subclasses:

ConcatFeatureExtractor, DeltasFeatureExtractor, S3FeatureExtractor

public abstract class AbstractFeatureExtractor
extends BaseDataProcessor

Abstract base class for windowed feature extractors like DeltasFeatureExtractor, ConcatFeatureExtractor or S3FeatureExtractor. The main purpose of this it to collect window size cepstra frames in a buffer and let the extractor compute the feature frame with them.

Field Summary

static java.lang.String

PROP_FEATURE_WINDOW The name of the SphinxProperty for the window of the DeltasFeatureExtractor.

Constructor Summary

AbstractFeatureExtractor()

AbstractFeatureExtractor(int window)

Method Summary

Data	getData() Returns the next Data object produced by this DeltasFeatureExtractor.
void	initialize() Initializes this DataProcessor.
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, getTimer, setPredecessor

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

getName, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

PROP_FEATURE_WINDOW

@S4Integer(defaultValue=3)
public static final java.lang.String PROP_FEATURE_WINDOW

The name of the SphinxProperty for the window of the DeltasFeatureExtractor.

See Also:

Constant Field Values

Constructor Detail

AbstractFeatureExtractor

public AbstractFeatureExtractor(int window)

Parameters:

window -

AbstractFeatureExtractor

public AbstractFeatureExtractor()

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()

Description copied from class: BaseDataProcessor

Initializes this DataProcessor. This is typically called after the DataProcessor has been configured.

Specified by:

initialize in interface DataProcessor

Overrides:

initialize in class BaseDataProcessor

getData

public Data getData()
             throws DataProcessingException

Returns the next Data object produced by this DeltasFeatureExtractor.

Specified by:

getData in interface DataProcessor

Specified by:

getData in class BaseDataProcessor

Returns:

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

Throws:

DataProcessingException - if there is a data processing error