signalproc.filtering.timedomain

Class IIR_Filter

java.lang.Object

org.trianacode.taskgraph.Unit

signalproc.filtering.timedomain.IIR_Filter

public class IIR_Filter
extends Unit

A IIR_Filter unit to implement an IIR filter in the time domain, ie for input data {x(k)}, the filter coefficients {a(k),b(k)} lead to output {y{k}):<\p>

y(n) = a(0)x(n) + a(1)x(n-1) + a(2)x(n-2) + ... - b(0)y(n-1) - ...<\p>

Note that the b*y terms are subtracted, not added. The user gives an arbitrary number of coefficients for both sequences a and b, and the unit applies them to the input and previously computed data. The unit maintains continuity across successive input data sets if the user requests it. The computation starts off as if the first data set had been preceded by a sequence of zeros.

Field Summary

Fields inherited from class org.trianacode.taskgraph.Unit

CLONE_ALL_OUTPUT, CLONE_MULTIPLE_OUTPUT, COPY_OUTPUT, ESSENTIAL, ESSENTIAL_IF_CONNECTED, IMMEDIATE_UPDATE, INTERNAL, LATE_INITIALIZE, NO_UPDATE, ON_TASK_INSTANTATION, ON_USER_ACCESS, OPTIONAL, PROCESS_UPDATE, TRANSIENT, TRANSIENT_ACCESSIBLE, USER_ACCESSIBLE

Constructor Summary

Constructors

Constructor and Description
IIR_Filter()

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	getHelpFile()
java.lang.String[]	getInputTypes() This method should return an array of the data types accepted by nodes not specified in getNodeInputTypes (e.g.
java.lang.String[]	getOutputTypes() This method should return an array of the data types output by nodes not specified in getNodeOutputTypes() (e.g.
java.lang.String	getPopUpDescription() This returns a brief! description of what the unit does.
void	init() Initialses information specific to IIR_Filter.
void	parameterUpdate(java.lang.String name, java.lang.Object value) Used to set each of IIR_Filter's parameters.
void	process() ********************************************* ** USER CODE of FIR_Filter goes here *** *********************************************
void	reset() Called when the reset button is pressed within the MainTriana Window
void	stopping() Called when the stop button is pressed within the MainTriana Window
void	updateWidgetFor(java.lang.String name) Don't need to use this for GUI Builder units as everthing is updated by triana automatically

Methods inherited from class org.trianacode.taskgraph.Unit

debug, debug, defineParameter, dispose, extractClipInState, getClipIn, getClipIn, getControlInterface, getDefaultInputNodes, getDefaultNodeRequirement, getDefaultOutputNodes, getDisplayName, getDisplayPackage, getGUIBuilderV2Info, getHelpFileLocation, getInputAtNode, getInputNodeCount, getMaximumInputNodes, getMaximumOutputNodes, getMinimumInputNodes, getMinimumOutputNodes, getNodeInputTypes, getNodeOutputTypes, getOutputNodeCount, getOutputPolicy, getPackageName, getParameter, getParameterPanelClass, getParameterPanelInstantiate, getParameterType, getParameterUpdatePolicy, getRunnableInterface, getTask, getTaskGraphContext, getToolName, getToolPackage, getToolTable, getVersion, hideParameterPanel, isClipInName, isInputAtNode, isOutputSent, isParameter, log, log, notifyError, notifyError, output, outputAtNode, outputAtNode, parameterUpdated, putClipIn, removeClipIn, removeParameter, restoreClipInState, setDefaultInputNodes, setDefaultNodeRequirement, setDefaultOutputNodes, setDisplayName, setDisplayPackage, setGUIBuilderV2Info, setHelpFileLocation, setMaximumInputNodes, setMaximumOutputNodes, setMinimumInputNodes, setMinimumOutputNodes, setOutputPolicy, setParameter, setParameterPanelClass, setParameterPanelInstantiate, setParameterUpdatePolicy, setPopUpDescription, setRunnableInterface, setToolName, setToolPackage, setVersion, showParameterPanel

Methods inherited from class java.lang.Object

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

Constructor Detail

IIR_Filter

public IIR_Filter()

Method Detail

process

public void process()
             throws java.lang.Exception

********************************************* ** USER CODE of FIR_Filter goes here *** *********************************************

Specified by:

process in class Unit

Throws:

java.lang.Exception

init

public void init()

Initialses information specific to IIR_Filter.

Overrides:

init in class Unit

reset

public void reset()

Called when the reset button is pressed within the MainTriana Window

Overrides:

reset in class Unit

stopping

public void stopping()

Called when the stop button is pressed within the MainTriana Window

Overrides:

stopping in class Unit

parameterUpdate

public void parameterUpdate(java.lang.String name,
                   java.lang.Object value)

Used to set each of IIR_Filter's parameters.

Overrides:

parameterUpdate in class Unit

updateWidgetFor

public void updateWidgetFor(java.lang.String name)

Don't need to use this for GUI Builder units as everthing is updated by triana automatically

getInputTypes

public java.lang.String[] getInputTypes()

Description copied from class: Unit

This method should return an array of the data types accepted by nodes not specified in getNodeInputTypes (e.g. triana.types.VectorType). If no package is specified then triana.types is assumed.

Specified by:

getInputTypes in class Unit

Returns:

a string containing the names of the types allowed to be input to IIR_Filter, each separated by a white space.

getOutputTypes

public java.lang.String[] getOutputTypes()

Description copied from class: Unit

This method should return an array of the data types output by nodes not specified in getNodeOutputTypes() (e.g. triana.types.VectorType). If no package is specified then triana.types is assumed.

Specified by:

getOutputTypes in class Unit

Returns:

an array of the output types for this unit

getPopUpDescription

public java.lang.String getPopUpDescription()

This returns a brief! description of what the unit does. The text here is shown in a pop up window when the user puts the mouse over the unit icon for more than a second.

Overrides:

getPopUpDescription in class Unit

getHelpFile

public java.lang.String getHelpFile()