Package com.musicg.api

Class DetectionApi

java.lang.Object

com.musicg.api.DetectionApi

Direct Known Subclasses:

ClapApi, WhistleApi

public class DetectionApi
extends java.lang.Object

Api for detecting different sounds

Author:

Jacquet Wong

Field Summary

Fields

Modifier and Type	Field	Description
protected int	fftSampleSize
protected int	highPass
protected int	lowerBoundary
protected int	lowPass
protected double	maxFrequency
protected double	maxIntensity
protected int	maxNumZeroCross
protected double	maxStandardDeviation
protected double	minFrequency
protected double	minIntensity
protected int	minNumZeroCross
protected double	minStandardDeviation
protected int	numFrequencyUnit
protected int	numRobust
protected double	unitFrequency
protected int	upperBoundary
protected WaveHeader	waveHeader

Constructor Summary

Constructors

Constructor	Description
DetectionApi(WaveHeader waveHeader)	Constructor, support mono Wav only, 4096 sample byte size for 44100Hz 16bit mono wav

Method Summary

Modifier and Type	Method	Description
protected void	init()	Initiate the settings for specific sound detection
protected boolean	isPassedFrequency(double[] spectrum)
protected boolean	isPassedIntensity(double[] spectrum)
protected boolean	isPassedStandardDeviation(double[][] spectrogramData)
protected boolean	isPassedZeroCrossingRate(short[] amplitudes)
boolean	isSpecificSound(byte[] audioBytes)	Determine the audio bytes contains a specific sound or not
protected void	normalizeSpectrogramData(double[][] spectrogramData)

Methods inherited from class java.lang.Object

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

Field Detail

waveHeader

protected WaveHeader waveHeader

fftSampleSize

protected int fftSampleSize

numFrequencyUnit

protected int numFrequencyUnit

unitFrequency

protected double unitFrequency

minFrequency

protected double minFrequency

maxFrequency

protected double maxFrequency

minIntensity

protected double minIntensity

maxIntensity

protected double maxIntensity

minStandardDeviation

protected double minStandardDeviation

maxStandardDeviation

protected double maxStandardDeviation

highPass

protected int highPass

lowPass

protected int lowPass

minNumZeroCross

protected int minNumZeroCross

maxNumZeroCross

protected int maxNumZeroCross

lowerBoundary

protected int lowerBoundary

upperBoundary

protected int upperBoundary

numRobust

protected int numRobust

Constructor Detail

DetectionApi

public DetectionApi(WaveHeader waveHeader)

Constructor, support mono Wav only, 4096 sample byte size for 44100Hz 16bit mono wav

Parameters:

sampleRate - Sample rate of the input audio byte

bitsPerSample - Bit size of a sample of the input audio byte

Method Detail

init

protected void init()

Initiate the settings for specific sound detection

isSpecificSound

public boolean isSpecificSound(byte[] audioBytes)

Determine the audio bytes contains a specific sound or not

Parameters:

audioBytes - input audio byte

Returns:

normalizeSpectrogramData

protected void normalizeSpectrogramData(double[][] spectrogramData)

isPassedStandardDeviation

protected boolean isPassedStandardDeviation(double[][] spectrogramData)

isPassedFrequency

protected boolean isPassedFrequency(double[] spectrum)

isPassedIntensity

protected boolean isPassedIntensity(double[] spectrum)

isPassedZeroCrossingRate

protected boolean isPassedZeroCrossingRate(short[] amplitudes)