public class Autocorrelation extends SDFTransformer
Both biased and unbiased autocorrelation estimates are supported. If the parameter biased is true, then the autocorrelation estimate is
N-1-k
1 ---
r(k) = - \ x(n)x(n+k)
N /
---
n=0
for k = 0, ... , p, where N is the number of
inputs to average (numberOfInputs), p is the number of
lags to estimate (numberOfLags), and x* is the
conjugate of the input (if it is complex).
This estimate is biased because the outermost lags have fewer than N
terms in the summation, and yet the summation is still normalized by N.
If the parameter biased is false (the default), then the estimate is
N-1-k
1 ---
r(k) = --- \ x(n)x(n+k)
N-k /
---
n=0
In this case, the estimate is unbiased.
However, note that the unbiased estimate does not guarantee
a positive definite sequence, so a power spectral estimate based on this
autocorrelation estimate may have negative components.
The output will be an array of tokens whose type is at least that of the input. If the parameter symmetricOutput is true, then the output will be symmetric and have length equal to twice the number of lags requested plus one. Otherwise, the output will have length equal to twice the number of lags requested, which will be almost symmetric (insert the last sample into the first position to get the symmetric output that you would get with the symmetricOutput being true).
Entity.ContainedObjectsIterator| Modifier and Type | Field and Description |
|---|---|
Parameter |
biased
If true, the estimate will be biased.
|
Parameter |
numberOfInputs
Number of input samples to average.
|
Parameter |
numberOfLags
Number of autocorrelation lags to output.
|
Parameter |
symmetricOutput
If true, then the output from each firing
will have 2*numberOfLags + 1
samples (an odd number) whose values are symmetric about
the midpoint.
|
input, input_tokenConsumptionRate, output, output_tokenInitProduction, output_tokenProductionRate_typesValid_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _deferChangeRequests, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKSCOMPLETED, NOT_READY, STOP_ITERATING| Constructor and Description |
|---|
Autocorrelation(CompositeEntity container,
java.lang.String name)
Construct an actor with the given container and name.
|
| Modifier and Type | Method and Description |
|---|---|
void |
attributeChanged(Attribute attribute)
Check to see that the numberOfInputs parameter is positive,
and that the numberOfLags parameter is positive.
|
java.lang.Object |
clone(Workspace workspace)
Clone the actor into the specified workspace.
|
void |
fire()
Consume tokens from the input and produce a token on the output
that contains an array token that represents an autocorrelation
estimate of the consumed tokens.
|
boolean |
prefire()
If there are not sufficient inputs, then return false.
|
_containedTypeConstraints, _customTypeConstraints, _defaultTypeConstraints, _fireAt, _fireAt, attributeTypeChanged, clone, isBackwardTypeInferenceEnabled, newPort, typeConstraintList, typeConstraints_actorFiring, _actorFiring, _declareDelayDependency, addActorFiringListener, addInitializable, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, initialize, inputPortList, isFireFunctional, isStrict, iterate, newReceiver, outputPortList, postfire, preinitialize, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate, wrapup_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName_addPort, _description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _containedDecorators, _copyChangeRequestList, _debug, _debug, _debug, _debug, _debug, _executeChangeRequests, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _notifyHierarchyListenersAfterChange, _notifyHierarchyListenersBeforeChange, _propagateValue, _removeAttribute, _splitName, _stripNumericSuffix, addChangeListener, addDebugListener, addHierarchyListener, attributeDeleted, attributeList, attributeList, decorators, 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, notifyOfNameChange, propagateValue, propagateValues, removeAttribute, removeChangeListener, removeDebugListener, removeHierarchyListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, validateSettables, workspaceequals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitcreateReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortListisFireFunctional, isStrict, iterate, postfire, stop, stopFire, terminateaddInitializable, initialize, preinitialize, removeInitializable, wrapupdescription, getContainer, getDisplayName, getFullName, getName, getName, setNamegetDerivedLevel, getDerivedList, propagateValuepublic Parameter biased
public Parameter numberOfInputs
public Parameter numberOfLags
public Parameter symmetricOutput
public Autocorrelation(CompositeEntity container, java.lang.String name) throws NameDuplicationException, IllegalActionException
container - The container.name - The name of this actor.IllegalActionException - If the actor cannot be contained
by the proposed container.NameDuplicationException - If the container already has an
actor with this name.public void attributeChanged(Attribute attribute) throws IllegalActionException
attributeChanged in class NamedObjattribute - The attribute that has changed.IllegalActionException - If the parameters are out of range.public java.lang.Object clone(Workspace workspace) throws java.lang.CloneNotSupportedException
clone in class TypedAtomicActorworkspace - The workspace for the new object.java.lang.CloneNotSupportedException - If a derived class has
an attribute that cannot be cloned.NamedObj.exportMoML(Writer, int, String),
NamedObj.setDeferringChangeRequests(boolean)public void fire()
throws IllegalActionException
fire in interface Executablefire in class AtomicActor<TypedIOPort>IllegalActionException - If there is no director.public boolean prefire()
throws IllegalActionException
prefire in interface Executableprefire in class SDFTransformerIllegalActionException - If the base class throws it.