edu.berkeley.guir.ptk.abstraction
Class VoiceAbstractor

java.lang.Object
  edu.berkeley.guir.ptk.PTK
      edu.berkeley.guir.ptk.abstraction.Abstractor
          edu.berkeley.guir.ptk.abstraction.VoiceAbstractor

public class VoiceAbstractor

extends Abstractor

Recognizes voices and conversations given audio frequency samples based on common voice frequencies. This is an approximate recognizer: other sounds with similar frequencies samples will be considered voices. To recognize conversations, this class keeps track of how long voices have been detected. Conversations are determined to be present if a "mini conversation" has occured in the last one minute. A "mini conversation" is when there have been at least 5 voice events in the past 10 seconds (note: this assumes a certain frequency of events). In other words, if there have been enough voices detected recently, it considers there to be a conversation occurring.

This abstractor adds three pieces of data to the event: (1) a DataSwitch that is true if voices were detected in the event audio data; (2) a DataSwitch that is true if a conversation is detected; and (3) and DataSwitch that is true if a conversation has recently ended (within the last five minutes).

Author:

tmatthew

Field Summary

static int	CONVERSATION
static int	CONVERSATION_RECENTLY_STOPPED
static int	END END * 10 = the number of seconds since there has been no conversation (no mini_conv); this is the amount of dead-time allowed in a conversation before it is no longer considered to be happening.
static int	NO_VOICES
static int	VOICE

Fields inherited from class edu.berkeley.guir.ptk.abstraction.Abstractor

data_ids_I_want, replace_data

Fields inherited from class edu.berkeley.guir.ptk.PTK

debug, MAX_DEBUG, MED_DEBUG, MIN_DEBUG, NO_DEBUG

Constructor Summary

VoiceAbstractor()

Method Summary

protected boolean	areThereVoices(double volume, double[] freqs)
boolean	doAbstract(Event e, History h) Performs the abstraction of the event e as specified by the class that implements this interface.

Methods inherited from class edu.berkeley.guir.ptk.abstraction.Abstractor

addMetadataIWant, canIAbstract, getAllMetadata, getFirstMetadata

Methods inherited from class edu.berkeley.guir.ptk.PTK

getMAX, getMED, getMIN, getNO, printDebug, printDebug, printError

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

END

public static final int END

END * 10 = the number of seconds since there has been no conversation (no mini_conv); this is the amount of dead-time allowed in a conversation before it is no longer considered to be happening.

See Also:

Constant Field Values

NO_VOICES

public static final int NO_VOICES

See Also:

Constant Field Values

VOICE

public static final int VOICE

See Also:

Constant Field Values

CONVERSATION

public static final int CONVERSATION

See Also:

Constant Field Values

CONVERSATION_RECENTLY_STOPPED

public static final int CONVERSATION_RECENTLY_STOPPED

See Also:

Constant Field Values

Constructor Detail

VoiceAbstractor

public VoiceAbstractor()

Method Detail

doAbstract

public boolean doAbstract(Event e,
                          History h)

Description copied from class: Abstractor

Performs the abstraction of the event e as specified by the class that implements this interface. Returns true if the abstraction was successful and false otherwise.

Specified by:

doAbstract in class Abstractor

Parameters:

e -

h -

Returns:

boolean

areThereVoices

protected boolean areThereVoices(double volume,
                                 double[] freqs)