edu.cmu.sphinx.frontend.util
Class StreamHTKCepstrum

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

All Implemented Interfaces:

DataProcessor, Configurable

public class StreamHTKCepstrum
extends BaseDataProcessor

Produces Mel-cepstrum data from an InputStream. To set the input stream with cepstral data, use the setInputStream method, and then call getData() to obtain the Data objects that have cepstrum data in it.

Field Summary

static java.lang.String	PROP_BIGENDIAN The SphinxProperty specifying whether the input is big endian.
static java.lang.String	PROP_BINARY The SphinxProperty specifying whether the input is in binary.
static java.lang.String	PROP_CEPSTRUM_LENGTH The sphinx property specifying the length of the cepstrum data.
static java.lang.String	PROP_FRAME_SHIFT_MS The sphinx property name for frame shift in milliseconds, which has a default value of 10F.
static java.lang.String	PROP_FRAME_SIZE_MS The sphinx property name for frame size in milliseconds.
static java.lang.String	PROP_SAMPLE_RATE The sphinx property that defines the sample rate

Constructor Summary

StreamHTKCepstrum()

StreamHTKCepstrum(float frameShiftMs, float frameSizeMs, boolean bigEndian, int sampleRate)

Method Summary

Data	getData() Returns the next Data object, which is the mel cepstrum of the input frame.
void	initialize() Constructs a StreamCepstrumSource that reads MelCepstrum data from the given path.
void	newProperties(PropertySheet ps) This method is called when this configurable component needs to be reconfigured.
static short	readLittleEndianShort(java.io.DataInputStream dataStream)
void	setInputStream(java.io.InputStream stream) Sets the InputStream to read cepstral data from.

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_BINARY

@S4Boolean(defaultValue=true)
public static final java.lang.String PROP_BINARY

The SphinxProperty specifying whether the input is in binary.

See Also:

Constant Field Values

PROP_BIGENDIAN

@S4Boolean(defaultValue=true)
public static final java.lang.String PROP_BIGENDIAN

The SphinxProperty specifying whether the input is big endian.

See Also:

Constant Field Values

PROP_FRAME_SIZE_MS

@S4Double(defaultValue=25.625)
public static final java.lang.String PROP_FRAME_SIZE_MS

The sphinx property name for frame size in milliseconds.

See Also:

Constant Field Values

PROP_FRAME_SHIFT_MS

@S4Double(defaultValue=10.0)
public static final java.lang.String PROP_FRAME_SHIFT_MS

The sphinx property name for frame shift in milliseconds, which has a default value of 10F.

See Also:

Constant Field Values

PROP_CEPSTRUM_LENGTH

@S4Integer(defaultValue=13)
public static final java.lang.String PROP_CEPSTRUM_LENGTH

The sphinx property specifying the length of the cepstrum data.

See Also:

Constant Field Values

PROP_SAMPLE_RATE

@S4Integer(defaultValue=16000)
public static final java.lang.String PROP_SAMPLE_RATE

The sphinx property that defines the sample rate

See Also:

Constant Field Values

Constructor Detail

StreamHTKCepstrum

public StreamHTKCepstrum(float frameShiftMs,
                         float frameSizeMs,
                         boolean bigEndian,
                         int sampleRate)

StreamHTKCepstrum

public StreamHTKCepstrum()

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()

Constructs a StreamCepstrumSource that reads MelCepstrum data from the given path.

Specified by:

initialize in interface DataProcessor

Overrides:

initialize in class BaseDataProcessor

setInputStream

public void setInputStream(java.io.InputStream stream)
                    throws java.io.IOException

Sets the InputStream to read cepstral data from.

Parameters:

stream - the InputStream to read cepstral data from

Throws:

java.io.IOException - if an I/O error occurs

readLittleEndianShort

public static short readLittleEndianShort(java.io.DataInputStream dataStream)
                                   throws java.io.IOException

Throws:

java.io.IOException

getData

public Data getData()
             throws DataProcessingException

Returns the next Data object, which is the mel cepstrum of the input frame. However, it can also be other Data objects like DataStartSignal.

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 a data processing error occurs