TSignalAnalyzer Class

type TSignalAnalyzer = class(TSignal);

Analyzes a signal with different methods in time domain.

Applies the operation selected by Transform to the Input signal and places the result in Self.Data. Transform = ttAutoCorr computes the one-sided autocorrelation $r[k]$ for lags k = 0 ... CorrTaps1-1, scaled by AutoCorrType: normal r[k]=sum_n x[n] x[n+k] (so $r[0]$ equals the signal energy sum_n x[n]^2), biased $r[k]/N$ , unbiased $r[k]/(N-k)$ . ttCrossCorr computes the raw cross-correlation of the two Inputs, Data[n] = sum_k x_1[k] x_2[k+n], n = 0 ... CorrTaps1-1, whose peak lag equals the delay between the two signals. ttDct / ttInverseDct apply the orthonormal DCT-II and its inverse, satisfying IDCT(DCT(x)) = x. ttRealCepstrum returns the real cepstrum c = F^(-1)bigl(ln| F(x)|bigr) (a windowed, half-length estimate) in which an echo of delay D produces a rahmonic peak whose quefrency tracks D; ttCplxCepstrum keeps the unwrapped phase. Integration further integrates (trapezoidal, inOnce/inTwice) or differentiates (central difference (x[i+2]-x[i])/(2 Delta t), diffOnce/diffTwice) the signal using the sample interval Delta t = 1/F_s. The resulting signal is always placed in Self.Data.

Properties

Name	Type	Description
Active	Boolean	Set active to false to suppress the propagation of the Pull request and the subsequent call to the Update method.
AutoCorrType	TAutoCorrType	Select the auto-correlation type.
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	Boolean	Block streaming of specific properties when storing only a "template".
ChannelCount	Integer	Get or set the number of channels multiplexed in the data property.
Complex	Boolean	Set this property to true, to request computation using complex numbers.
Continuous	Boolean	If True, the component will pass on the udpate request to the connected component.
CorrTaps1	Integer	Select number of taps for auto-correlation and cross-correlation.
CorrTaps2	Integer	Select number of taps for cross-correlation.
Data	TVec	Stores the result of the processing.
Dt	Double	Time between two consecutive samples.
EditorActive	Boolean	Returns True, if the component editor is displayed.
ExpWindow	Double	Final value of the exponential window.
FloatPrecision	TMtxFloatPrecision	Set this property to request computation in 32bit/64bit precision with real/complex numbers.
FloatPrecisionLock	Boolean	Set this property to true to lock changes to FloatPrecision property.
HzRes	Double	Frequency resolution obtained, if an FFT algorithm would be run on the data.
Input	TAnalysis	Connector property to obtain a pointer to the TSignal component holding the data to be processed.
Integration	TIntegration	Specifies, if the signal should be integrated or differentiated.
IsDouble	Boolean	Set this property to false, to request computation in 32bit floating point precision, 64bit, if true.
Item	Double	Default property to access values of a real signal.
ItemNumber	Integer	Number to label the object when it is an item in the List.
Length	Integer	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.
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.
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".
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.
RemoveDC	Boolean	If True, subtract the average value from the signal. This is not usuable for streaming.
Report	TSignalReport	Generates a report/description of the signal.
Rotation	Integer	Defines the rotation in number of samples within the current buffer.
SamplingFrequency	Double	Defines the sampling frequency of the signal.
SamplingTime	Double	The length of the signal in seconds.
ScaleFactor	Double	The signal will be scaled with the ScaleFactor.
SidelobeAtt	Double	Defines sidelobe attenuation for the Kaiser and Cheybshev window.
SuspendNotifyUpdate	Boolean	Set this property to True, to prevent calling OnNotifyUpdate from the Update Method.
Transform	TTimeTransform	Selects the type of the transform to apply to the signal.
UsesInputs	Boolean	Set it to True to indicate, that valid signals will be connected to the Input or Inputs properties.
Window	TSignalWindowType	Defines the window to applied to the signal.

Methods

Name	Description
AllowStreaming	Returns the negatated value of BlockAssign.
Append	Appends Sample to the end of the signal.
ApplyWindow	Apply the window function.
Assign	Assign values of all published properties from Source.
AssignTemplate	Assign values of "template-like" published properties from Source.
Copy	Copies signal Data and sampling frequency information.
Crest	Compute the CREST parameter.
EditorClass	To be overriden in descendanr classses.
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.
NearestMaximum	Find the nearest maximum. The initial position in seconds is given with pos and the final position is returned with the Pos parameter.
NearestMinimum	Find the nearest minimum. The initial position in seconds is given with pos and the final position is returned with the Pos parameter.
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.
Pull	Request recalculation of the entire chain of all connected components.
PullUntilEnd	Calls Pull until pipeEnd is returned.
Reset	Reset is called after loading the data from stream or file.
ResetIntegrator	Resets initial conditions for integration and differentiation.
SaveTemplateToFile	Save template to file.
SaveTemplateToStream	Save template to stream.
SaveToStream	Save the component to Dst stream.
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.
ValuesToStrings	Convert values to strings.
ZeroCrossing	Compute the position of the zero crossing. The initial position in seconds is given with pos and the final position is returned with the Pos parameter. y contains the final value of the time signal. In ideal case it should be zero. The method will use linear interpolation to locate the position of the zero.