Package ipsk.audio.dsp

Class PeakDetector

java.lang.Object

ipsk.audio.dsp.AudioSampleProcessor

ipsk.audio.dsp.AudioFrameProcessor

ipsk.audio.dsp.PeakDetector

public class PeakDetector
extends AudioFrameProcessor

Calculates peak levels of an audio signal.

Author:

K.Jaensch, klausj@phonetik.uni-muenchen.de

Field Summary

Fields

Modifier and Type	Field	Description
protected static float	ln

Fields inherited from class ipsk.audio.dsp.AudioSampleProcessor

ae, af, AUDITORY_THRESHOLD, bigEndian, channels, DEFAULT_0DB_SOUND_PRESSURE, frameSize, maxValue, minValue, pp, resolutionBits, sampleSize, signed

Constructor Summary

Constructors

Constructor	Description
PeakDetector(javax.sound.sampled.AudioFormat af)	Create peak detector

Method Summary

Modifier and Type	Method	Description
float[]	getLevels()	Get levels.
float[]	getPeakLevels()
void	process(byte[] data, int offset, int length)	Process data buffer.
LevelInfo[]	processBuffer(byte[] data, int offset, int length)	Process a new data buffer.
void	processBuffer(byte[] data, int offset, int length, LevelInfo[] levelInfos)	Process a new data buffer.
protected void	processFrame(float[] f)
void	setLevels(float[] levels)	Set levels.

Methods inherited from class ipsk.audio.dsp.AudioFrameProcessor

encode, encode, encodeToFloatValues, encodeValues, encodeValues, getDoubleValues, getFloatValues, getFloatValues, getFloatValues, getNormalizedInterleavedValues, getNormalizedInterleavedValues, getNormalizedValues

Methods inherited from class ipsk.audio.dsp.AudioSampleProcessor

amplitudeToSoundPressure, encodeValue, getChannels, getDoubleValue, getEncodedValue, getFloatValue, getFloatValue, getFrameSize, getNormalizedValue, getNormalizedValue, getSampleSize, setAudioFormat

Methods inherited from class java.lang.Object

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

Field Detail

ln

protected static float ln

Constructor Detail

PeakDetector

public PeakDetector(javax.sound.sampled.AudioFormat af)
             throws AudioFormatNotSupportedException

Create peak detector

Parameters:

af - audio format

Throws:

AudioFormatNotSupportedException

Method Detail

processBuffer

public LevelInfo[] processBuffer(byte[] data,
                                 int offset,
                                 int length)

Process a new data buffer. Only level and RMS level is set.

Parameters:

data - PCM coded data buffer

offset - offset in data

length - length of bytes to process

Returns:

array of level infos

processBuffer

public void processBuffer(byte[] data,
                          int offset,
                          int length,
                          LevelInfo[] levelInfos)

Process a new data buffer. Only level and RMS level is set. This method prevents the peak detector from allocating new level info objects. The peak level hold value is set if current peak level is higher.

Parameters:

data - PCM coded data buffer

offset - offset in data

length - length of bytes to process

levelInfos - array of level infos

process

public void process(byte[] data,
                    int offset,
                    int length)

Process data buffer.

Parameters:

data - PCM coded data buffer

offset - offset in data

length - length of bytes to process

processFrame

protected void processFrame(float[] f)

getPeakLevels

public float[] getPeakLevels()

getLevels

public float[] getLevels()

Get levels.

Returns:

array of levels

setLevels

public void setLevels(float[] levels)

Set levels.

Parameters:

levels - array of levels