TSignalInterpolator Class

class TSignalInterpolator : public TSignalMultiRate;

Performs signal interpolation.

Signal interpolation component. Use this component to raise the sampling frequency of the signal by power of two integer factor using fast multi-rate, multi-stage filters (See [1]). The CPU load increases nearly linear with the interpolation factor.

References:

[[1] Understanding digital signal processing, Richard G. Lyons, Prentice-Hall, 2001.]([1] Understanding digital signal processing, Richard G. Lyons, Prentice-Hall, 2001.)

Constructors

Name	Description
TSignalInterpolator (2)

Properties

Name	Type	Description
Active	bool	Set active to false to suppress the propagation of the Pull request and the subsequent call to the Update method.
AudioSignal	bool	Adjust filters for audio signal.
BandWidth	double	Return the bandwidth of the signal.
BandwidthH	double	Returns the upper bandwidth edge of the signal.
BandwidthL	double	Returns the lower bandwidth edge of the signal.
BlockAssign	bool	Block streaming of specific properties when storing only a "template".
ChannelCount	int	Get or set the number of channels multiplexed in the data property.
Complex	bool	Set this property to true, to request computation using complex numbers.
Continuous	bool	If True, the component will pass on the udpate request to the connected component.
Data	TVec*	Stores the result of the processing.
Dt	double	Time between two consecutive samples.
EditorActive	bool	Returns True, if the component editor is displayed.
ExternalTaps	bool	Enables user specified filter.
Factor	int	Decimation/Interpolation factor.
FilterDelay	double	Returns the filter delay in number of samples of the final sampling frequency.
FirInitialized	bool
FloatPrecision	TMtxFloatPrecision	Set this property to request computation in 32bit/64bit precision with real/complex numbers.
FloatPrecisionLock	bool	Set this property to true to lock changes to FloatPrecision property.
HalfBand	bool	Filters out upper half of the bandwidth.
HzRes	double	Frequency resolution obtained, if an FFT algorithm would be run on the data.
Initialized	bool	When set to false, the next call to the update method will reinitialize the FIR filters.
Input	TSignal*
Inputs	TSignalCollection*
IsDouble	bool	Set this property to false, to request computation in 32bit floating point precision, 64bit, if true.
ItemNumber	int	Number to label the object when it is an item in the List.
Length	int	Get or set the length of the signal in samples.
Marks	TMarkList*	Stores the time stamps and amplitude of selected samples.
MaxAmplt	double	Stores the maximum amplitude of the signal found by the MinMax method.
MaxX	double	Use the MaxX property to store the time stamp (in seconds) of the right most sample.
MinAmplt	double	Stores the minimum amplitude of the signal found by the MinMax method.
MinX	double	Use the MinX property to store the time stamp of the left-most sample.
MultiChannel	bool	Set MultiChannel to True, if Inputs property will be published, and Input property will remain hidden.
Name	DewString
OnAfterUpdate	tNotifyEvent	The event is triggered after the call to the Update method.
OnBeforeUpdate	tNotifyEvent	The event is triggered just before the call to the Update method.
OnDisplayUpdate	tNotifyEvent	The event is triggered after the OnAfterUpdate event. Use this event to update any associated charts or graphs or result tables.
OnGetFilterTaps	tNotifyEvent	Triggered when ExternalTaps is false.
OnGetInput	tNotifyEvent	If the Input property is not assigned, the component will call OnGetInput.
OnNotifyUpdate	tNotifyEvent	The event is called after a call to InternalUpdate, OnAfterUpdate and OnDisplayUpdate from within the Update method.
OnParameterUpdate	tNotifyEvent	The event is triggered when ParamUpdate method is called. The ParamUpdate method is usually called by component editors when a value was changed by the user and the editor was "Live".
PipeDirty	bool
PipeState	TPipeState	Returns the state of the pipe after the last update.
Reference	TReferenceList*	Stores a list of components that have to be notified, when this component is destroyed.
Ripple	double	Maximum ripple allowed in the passband and in the stopband.
SamplingFrequency	double	Defines the sampling frequency of the signal.
SamplingTime	double	The length of the signal in seconds.
ScaleFactor	double	Defines the factor by which the signal will be scaled.
SuspendNotifyUpdate	bool	Set this property to True, to prevent calling OnNotifyUpdate from the Update Method.
TransBW	double	Defines the width of the transition band of the FIR filter used for interpolation/decimation.
UsesInputs	bool	Set it to True to indicate, that valid signals will be connected to the Input or Inputs properties.

Methods

Name	Description
AllowStreaming
Append	Appends Sample to the end of the signal.
Assign
AssignTemplate	Assign values of "template-like" published properties from Source.
Copy	Copies signal Data and sampling frequency information.
Crest	Compute the CREST parameter.
DetectChannelCount
EditorClass	To be overriden in descendanr classses.
get_CValues
get_Values
GetInput
GetInputs
InitFilters	FirTaps and FinalStageTaps do not hold valid filter taps until InitFilters has been called.
InputsDirty	If all Inputs[i] are dirty the function returns true.
InternalPull	When called, the method will pass Update requests recursively to all connected objects.
Invalidate	Notifies all connected components that this component has fresh data.
LoadFromStream	Load the component from Src stream.
LoadTemplateFromFile	Load a template from file.
LoadTemplateFromStream	Load a template from stream.
MarksToStrings	Convert marks to strings.
MinMax	Find minimum and maximum amplitude and store the result in the MinAmplt and MaxAmplt properties.
ParamUpdate	The method can be assigned to some other component even handler, as a notification that a parameter has changed and that Self should consider a recalculation.
Peak	Find the maximum deviation of the signal from its mean value.
PipeReset	Recursively processes all connected components backward and calls Reset method.
Process	Filter Src and place the result in Dst.
Pull	Request recalculation of the entire chain of all connected components.
PullUntilEnd	Calls Pull until pipeEnd is returned.
ReferenceRemoved
Reset	The same as setting Initialized to false.
SaveTemplateToFile	Save template to file.
SaveTemplateToStream	Save template to stream.
SaveToStream	Save the component to Dst stream.
set_CValues
set_Values
SetComplex
SetFloatPrecision
SetInputs
SetIsDouble
Size	Assign the size of the signal from Src.
Update	Request recalculation of the data and place the result in Self.
UpdateNotify	Call this method only, if SuspendNotifyUpdate is True.
Values
ValuesToStrings	Convert values to strings.

Operators

Name	Description
operator[]

Fields

Name	Type	Description
FinalStageTaps	TVec *	Contains the FIR filter taps for the last filter stage in case of decimation and for the first stage filter in case of the interpolator.
FirTaps	TVec *	Contains the FIR filter taps for all filter stages except for the last.
Tag	intptr_t