jass.generators
Class HalfSampleDelayKLFilter

java.lang.Object
  jass.generators.HalfSampleDelayKLFilter

All Implemented Interfaces:

Filter

Direct Known Subclasses:

HalfSampleDelayTubeFilter

public class HalfSampleDelayKLFilter
extends java.lang.Object
implements Filter

Half sample delay Kelly-Lochbaum filter. See Master thesis of Siddarth Mathur, Univ. of Arizona 2003 for details of the algorithm. This implementation defines a tube of a certain maximum number of segments. the actual end segment depends on the actual length and can be modified at run-time.

Author:

Kees van den Doel (kvdoel@cs.ubc.ca)

Nested Class Summary

class

HalfSampleDelayKLFilter.State

Field Summary

protected float	srate Sampling rate in Hertz.
protected HalfSampleDelayKLFilter.State	state

Constructor Summary

HalfSampleDelayKLFilter()

HalfSampleDelayKLFilter(float srate, int nTubeSections)
Create and initialize.

Method Summary

protected void	allocate()
protected void	computeReflectionCoeff() Compute reflection coefficients from areas
void	filter(float[] output, float[] input, int nsamples, int inputOffset) Proces input (may be same as output).
void	resetFilter() Clear filter of past history
void	setAllCylinderRadii(double[] r) Set all radii
void	setCylinderRadius(int k, double r) Set an individual segment radius
void	setDampingCoeff(double val) Set damping coeff.
void	setEnd(int end) Set actual number of segments used
void	setGlottalReflectionCoeff(double val) Set the glottal reflection coeff.
void	setLipReflectionCoeff(double val) Set the end (lip) reflection coeff.

Methods inherited from class java.lang.Object

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

Field Detail

srate

protected float srate

Sampling rate in Hertz.

state

protected HalfSampleDelayKLFilter.State state

Constructor Detail

HalfSampleDelayKLFilter

public HalfSampleDelayKLFilter(float srate,
                               int nTubeSections)

Create and initialize.

Parameters:

srate - sampling rate in Hertz.

nTubeSection - maximum number of sections (must be even)

HalfSampleDelayKLFilter

public HalfSampleDelayKLFilter()

Method Detail

allocate

protected void allocate()

resetFilter

public void resetFilter()

Clear filter of past history

setEnd

public void setEnd(int end)

Set actual number of segments used

Parameters:

end - number of segments (so last segment used has index end-1)

computeReflectionCoeff

protected void computeReflectionCoeff()

Compute reflection coefficients from areas

setGlottalReflectionCoeff

public void setGlottalReflectionCoeff(double val)

Set the glottal reflection coeff.

Parameters:

val - glottal reflection coefficient

setLipReflectionCoeff

public void setLipReflectionCoeff(double val)

Set the end (lip) reflection coeff.

Parameters:

val - glottal reflection coefficient (positive, actual coeff is negative)

setDampingCoeff

public void setDampingCoeff(double val)

Set damping coeff. (1 == no damping)

Parameters:

val - damping coefficient

setCylinderRadius

public void setCylinderRadius(int k,
                              double r)

Set an individual segment radius

Parameters:

k - index of segment (0,...)

r - radius to set

setAllCylinderRadii

public void setAllCylinderRadii(double[] r)

Set all radii

Parameters:

array - of r radii

filter

public void filter(float[] output,
                   float[] input,
                   int nsamples,
                   int inputOffset)

Proces input (may be same as output). Implements Filter interface

Specified by:

filter in interface Filter

Parameters:

output - user provided buffer for returned result.

input - user provided input buffer.

nsamples - number of samples written to output buffer.

inputOffset - where to start in circular buffer input (unused)