ptolemy.actor.lib
Class GradientAdaptiveLattice

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.InstantiableNamedObj
          ptolemy.kernel.Entity
              ptolemy.kernel.ComponentEntity
                  ptolemy.actor.AtomicActor
                      ptolemy.actor.TypedAtomicActor
                          ptolemy.actor.lib.Transformer
                              ptolemy.actor.lib.Lattice
                                  ptolemy.actor.lib.GradientAdaptiveLattice

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Actor, Executable, FiringsRecordable, Initializable, TypedActor, Changeable, Debuggable, DebugListener, Derivable, Instantiable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

public class GradientAdaptiveLattice
extends Lattice

An adaptive FIR filter with a lattice structure. This class extends the base class to dynamically adapt the reflection coefficients to minimize the power of the output sequence. The output reflection coefficients are guaranteed to lie between -1.0 and 1.0, ensuring that the resulting filter is a minimum phase linear predictor. The reflectionCoefficients parameter is interpreted as the initial coefficients.

Since:

Ptolemy II 4.0

Version:

$Id: GradientAdaptiveLattice.java 57040 2010-01-27 20:52:32Z cxh $

Author:

Steve Neuendorffer

See Also:

Serialized Form

Accepted Rating:

Red (cxh)

Proposed Rating:

Red (vogel)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.kernel.Entity

Entity.ContainedObjectsIterator

Field Summary

private double	_alpha
private double[]	_estimatedErrorPower
private double[]	_estimatedErrorPowerCache
private double	_oneMinusAlpha
private double[]	_reflectionCoefficientsCache
TypedIOPort	adaptedReflectionCoefficients The output port that produces the current reflection coefficients.
Parameter	timeConstant The time constant of the filter, which determines how fast the filter adapts.

Fields inherited from class ptolemy.actor.lib.Lattice

_backward, _backwardCache, _forward, _forwardCache, _order, _reflectionCoefficients, reflectionCoefficients

Fields inherited from class ptolemy.actor.lib.Transformer

input, output

Fields inherited from class ptolemy.actor.AtomicActor

_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Fields inherited from interface ptolemy.actor.Executable

COMPLETED, NOT_READY, STOP_ITERATING

Constructor Summary

GradientAdaptiveLattice(CompositeEntity container, java.lang.String name)
Construct an actor with the given container and name.

Method Summary

protected void	_doFilter() Compute the filter, updating the caches, based on the current values.
protected void	_reallocate() Reallocate the internal arrays.
void	attributeChanged(Attribute attribute) Handle parameter change events on the order and timeConstant parameters.
java.lang.Object	clone(Workspace workspace) Clone the actor into the specified workspace.
void	initialize() Initialize the state of the filter.
boolean	postfire() Update the filter state.

Methods inherited from class ptolemy.actor.lib.Lattice

fire, prefire

Methods inherited from class ptolemy.actor.TypedAtomicActor

_addPort, _fireAt, _fireAt, attributeTypeChanged, clone, newPort, typeConstraintList, typeConstraints

Methods inherited from class ptolemy.actor.AtomicActor

_actorFiring, _actorFiring, addActorFiringListener, addInitializable, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, isFireFunctional, isStrict, iterate, newReceiver, outputPortList, preinitialize, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate, wrapup

Methods inherited from class ptolemy.kernel.ComponentEntity

_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName

Methods inherited from class ptolemy.kernel.Entity

_description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName

Methods inherited from class ptolemy.kernel.InstantiableNamedObj

_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateValue, _recordDecoratedAttributes, _removeAttribute, _splitName, _stripNumericSuffix, addChangeListener, addDebugListener, attributeList, attributeList, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getFullName, getModelErrorHandler, getName, getName, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, propagateValue, propagateValues, removeChangeListener, removeDebugListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, validateSettables, workspace

Methods inherited from class java.lang.Object

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

Methods inherited from interface ptolemy.actor.Actor

createReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortList

Methods inherited from interface ptolemy.actor.Executable

isFireFunctional, isStrict, iterate, stop, stopFire, terminate

Methods inherited from interface ptolemy.actor.Initializable

addInitializable, preinitialize, removeInitializable, wrapup

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getDisplayName, getFullName, getName, getName, setName

Methods inherited from interface ptolemy.kernel.util.Derivable

getDerivedLevel, getDerivedList, propagateValue

Field Detail

adaptedReflectionCoefficients

public TypedIOPort adaptedReflectionCoefficients

The output port that produces the current reflection coefficients. The port is of type array of double.

timeConstant

public Parameter timeConstant

The time constant of the filter, which determines how fast the filter adapts. The default value of this parameter is 1.0.

_alpha

private double _alpha

_oneMinusAlpha

private double _oneMinusAlpha

_estimatedErrorPower

private double[] _estimatedErrorPower

_estimatedErrorPowerCache

private double[] _estimatedErrorPowerCache

_reflectionCoefficientsCache

private double[] _reflectionCoefficientsCache

Constructor Detail

GradientAdaptiveLattice

public GradientAdaptiveLattice(CompositeEntity container,
                               java.lang.String name)
                        throws NameDuplicationException,
                               IllegalActionException

Construct an actor with the given container and name.

Parameters:

container - The container.

name - The name of this actor.

Throws:

IllegalActionException - If the actor cannot be contained by the proposed container.

NameDuplicationException - If the container already has an actor with this name.

Method Detail

attributeChanged

public void attributeChanged(Attribute attribute)
                      throws IllegalActionException

Handle parameter change events on the order and timeConstant parameters. The filter state vector is reinitialized to zero state.

Overrides:

attributeChanged in class Lattice

Parameters:

attribute - The attribute that changed.

Throws:

IllegalActionException - If this method is invoked with an unrecognized parameter.

clone

public java.lang.Object clone(Workspace workspace)
                       throws java.lang.CloneNotSupportedException

Clone the actor into the specified workspace. This calls the base class and then sets the type constraints.

Overrides:

clone in class Lattice

Parameters:

workspace - The workspace for the new object.

Returns:

A new actor.

Throws:

java.lang.CloneNotSupportedException - If a derived class has an attribute that cannot be cloned.

See Also:

NamedObj.exportMoML(Writer, int, String), NamedObj.setDeferringChangeRequests(boolean)

initialize

public void initialize()
                throws IllegalActionException

Initialize the state of the filter.

Specified by:

initialize in interface Initializable

Overrides:

initialize in class Lattice

Throws:

IllegalActionException - If a derived class throws it.

postfire

public boolean postfire()
                 throws IllegalActionException

Update the filter state.

Specified by:

postfire in interface Executable

Overrides:

postfire in class Lattice

Returns:

False if the number of iterations matches the number requested.

Throws:

IllegalActionException - If the base class throws it.

_doFilter

protected void _doFilter()
                  throws IllegalActionException

Description copied from class: Lattice

Compute the filter, updating the caches, based on the current values.

Overrides:

_doFilter in class Lattice

Throws:

IllegalActionException - Not thrown in this base class.

_reallocate

protected void _reallocate()

Description copied from class: Lattice

Reallocate the internal arrays.

Overrides:

_reallocate in class Lattice