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java.lang.Objectedu.cmu.sphinx.frontend.BaseDataProcessor
edu.cmu.sphinx.frontend.endpoint.SpeechClassifier
public class SpeechClassifier
Implements a level tracking endpointer invented by Bent Schmidt Nielsen.
This endpointer is composed of three main steps.
The first step, classification of audio into speech and non-speech, uses Bent Schmidt Nielsen's algorithm. Each time audio comes in, the average signal level and the background noise level are updated, using the signal level of the current audio. If the average signal level is greater than the background noise level by a certain threshold value (configurable), then the current audio is marked as speech. Otherwise, it is marked as non-speech.
The second and third step of this endpointer are documented in the classes SpeechMarker
and
NonSpeechDataFilter
.
SpeechMarker
Field Summary | |
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static java.lang.String |
PROP_ADJUSTMENT
The SphinxProperty specifying the adjustment. |
static java.lang.String |
PROP_FRAME_LENGTH_MS
The SphinxProperty specifying the endpointing frame length in milliseconds. |
static java.lang.String |
PROP_MIN_SIGNAL
The SphinxProperty specifying the minimum signal level used to update the background signal level. |
static java.lang.String |
PROP_THRESHOLD
The SphinxProperty specifying the threshold. |
Constructor Summary | |
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SpeechClassifier()
|
Method Summary | |
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Data |
getData()
Returns the next Data object. |
void |
initialize()
Initializes this LevelTracker endpointer and DataProcessor predecessor. |
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 |
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getPredecessor, getTimer, setPredecessor, toString |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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@S4Integer(defaultValue=10) public static final java.lang.String PROP_FRAME_LENGTH_MS
@S4Double(defaultValue=0.0) public static final java.lang.String PROP_MIN_SIGNAL
@S4Double(defaultValue=10.0) public static final java.lang.String PROP_THRESHOLD
@S4Double(defaultValue=0.0030) public static final java.lang.String PROP_ADJUSTMENT
Constructor Detail |
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public SpeechClassifier()
Method Detail |
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public void newProperties(PropertySheet ps) throws PropertyException
Configurable
newProperties
in interface Configurable
newProperties
in class BaseDataProcessor
ps
- a property sheet holding the new data
PropertyException
- if there is a problem with the properties.public void initialize()
initialize
in interface DataProcessor
initialize
in class BaseDataProcessor
public Data getData() throws DataProcessingException
getData
in interface DataProcessor
getData
in class BaseDataProcessor
DataProcessingException
- if a data processing error occurs
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