org.openimaj.audio.filters

Class Preemphasiser

java.lang.Object

org.openimaj.audio.Audio

org.openimaj.audio.AudioStream

org.openimaj.audio.processor.AudioProcessor

org.openimaj.audio.filters.Preemphasiser

All Implemented Interfaces:

Iterable<SampleChunk>

public class Preemphasiser
extends AudioProcessor

A simple preemphasiser that applies a high-pass filter to the the audio for speech signals. It's basically a really simple comb filter.

Version:

$Author$, $Revision$, $Date$

Author:

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

Created:

13 Aug 2012

Field Summary

Fields inherited from class org.openimaj.audio.Audio

format

Constructor Summary

Constructors

Constructor and Description
Preemphasiser() Default constructor
Preemphasiser(AudioStream as) Chainiable constructor
Preemphasiser(AudioStream as, double factor) Chainable constructor that takes the emphasis factor.
Preemphasiser(double factor) Constructor that takes the emphasis factor.

Method Summary

Modifier and Type	Method and Description
SampleChunk	process(SampleChunk sample) Function that takes a sample chunk and processes the chunk.

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

getLength, getUnderlyingStream, nextSampleChunk, 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

Preemphasiser

public Preemphasiser()

Default constructor

Preemphasiser

public Preemphasiser(double factor)

Constructor that takes the emphasis factor.

Parameters:

factor - The emphasis factor

Preemphasiser

public Preemphasiser(AudioStream as)

Chainiable constructor

Parameters:

as - The stream to chain to

Preemphasiser

public Preemphasiser(AudioStream as,
                     double factor)

Chainable constructor that takes the emphasis factor.

Parameters:

as - The stream to chain to

factor - The emphasis factor

Method Detail

process

public SampleChunk process(SampleChunk sample)
                    throws Exception

Function that takes a sample chunk and processes the chunk. It should also return a sample chunk containing the processed data. If wished, the chunk may be side-affected and the input chunk returned. It should not be assumed that the input chunk will be side-affected, but it must be noted that it is possible that it could be. This process function may also return null. If null is returned it means that the rest of the audio stream is not required to be processed by this processing function. Whether the rest of the sample chunks are copied or ignored is up to the caller.

Specified by:

process in class AudioProcessor

Parameters:

sample - The sample chunk to process.

Returns:

A sample chunk containing processed data.

Throws:

Exception - If the processing could not take place

See Also:

AudioProcessor.process(org.openimaj.audio.SampleChunk)