org.openimaj.audio.filters

Class HanningAudioProcessor

java.lang.Object

org.openimaj.audio.Audio

org.openimaj.audio.AudioStream

org.openimaj.audio.processor.AudioProcessor

org.openimaj.audio.processor.FixedSizeSampleAudioProcessor

org.openimaj.audio.filters.WeightedWindowedAudioProcessor

org.openimaj.audio.filters.HanningAudioProcessor

All Implemented Interfaces:

Iterable<SampleChunk>

Direct Known Subclasses:

HammingAudioProcessor

public class HanningAudioProcessor
extends WeightedWindowedAudioProcessor

Applies a Hanning window on top of the audio signal.

Author:

David Dupplaw (dpd@ecs.soton.ac.uk)

See Also:

"http://cnx.org/content/m0505/latest/"

Created:

31 Oct 2011

Field Summary

Fields inherited from class org.openimaj.audio.filters.WeightedWindowedAudioProcessor

useWeights, weightTable

Fields inherited from class org.openimaj.audio.Audio

format

Constructor Summary

Constructors

Constructor and Description
HanningAudioProcessor(AudioStream stream, int sizeRequired) Chainable constructor.
HanningAudioProcessor(AudioStream as, int nSamplesInWindow, int nSamplesOverlap) Chainable constructor that takes the size of the window and the number of samples overlap.
HanningAudioProcessor(int sizeRequired) Default constructor for non chainable processing.
HanningAudioProcessor(int nSamplesInWindow, int nSamplesOverlap) Constructor that takes the size of the window and the number of samples overlap.

Method Summary

Modifier and Type	Method and Description
protected void	generateWeightTableCache(int length, int nc) Generate the cos table cache

Methods inherited from class org.openimaj.audio.filters.WeightedWindowedAudioProcessor

getWeights, getWindowSum, getWindowSum, process, process, processSamples

Methods inherited from class org.openimaj.audio.processor.FixedSizeSampleAudioProcessor

getWindowSize, getWindowStep, isOverlapping, nextSampleChunk, setWindowSize, setWindowStep

Methods inherited from class org.openimaj.audio.processor.AudioProcessor

getLength, getUnderlyingStream, process, processingComplete, reset, setUnderlyingStream

Methods inherited from class org.openimaj.audio.AudioStream

iterator, seek

Methods inherited from class org.openimaj.audio.Audio

getFormat, setFormat

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

HanningAudioProcessor

public HanningAudioProcessor(int sizeRequired)

Default constructor for non chainable processing.

Parameters:

sizeRequired - Size of the window required

HanningAudioProcessor

public HanningAudioProcessor(AudioStream stream,
                             int sizeRequired)

Chainable constructor. Takes the audio stream and the size required.

Parameters:

stream - The audio stream to process

sizeRequired - The size of window required.

HanningAudioProcessor

public HanningAudioProcessor(int nSamplesInWindow,
                             int nSamplesOverlap)

Constructor that takes the size of the window and the number of samples overlap.

Parameters:

nSamplesInWindow - Samples in window

nSamplesOverlap - Samples in window overlap

HanningAudioProcessor

public HanningAudioProcessor(AudioStream as,
                             int nSamplesInWindow,
                             int nSamplesOverlap)

Chainable constructor that takes the size of the window and the number of samples overlap.

Parameters:

as - The chained audio stream

nSamplesInWindow - Samples in window

nSamplesOverlap - Samples in window overlap

Method Detail

generateWeightTableCache

protected void generateWeightTableCache(int length,
                                        int nc)

Generate the cos table cache

Specified by:

generateWeightTableCache in class WeightedWindowedAudioProcessor

Parameters:

length - The length of the window to generate (per channel)

nc - The number of channels for which to generate a weight table