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Owning Palette: Adaptive Filters VIs

Installed With: Adaptive Filter Toolkit

Creates a finite impulse response (FIR) adaptive filter with the QR decomposition-based recursive least squares (QR-RLS) algorithm. You must manually select the polymorphic instance you want to use.

Note  National Instruments recommends that you create and destroy adaptive filters outside loop structures.

Example

Use the pull-down menu to select an instance of this VI.

Select an instance AFT Create FIR QR-RLS (Real)AFT Create FIR QR-RLS (Complex)

AFT Create FIR QR-RLS (Real)

	filter length specifies the filter length of the adaptive filter. The value must be greater than or equal to 2. The default is 128.
	forgetting factor specifies the forgetting factor of the adaptive filter. The valid value range is (0, 1]. National Instruments recommends that you specify a value between [0.9, 1]. The default is 0.95.
	regularization factor specifies the regularization factor of the adaptive filter. The value must be greater than zero. The default is 1E–5.
	error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
	adaptive filter out returns the adaptive filter that this VI creates.
	error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

AFT Create FIR QR-RLS (Complex)

	filter length specifies the filter length of the adaptive filter. The value must be greater than or equal to 2. The default is 128.
	forgetting factor specifies the forgetting factor of the adaptive filter. The valid value range is (0, 1]. National Instruments recommends that you specify a value between [0.9, 1]. The default is 0.95.
	regularization factor specifies the regularization factor of the adaptive filter. The value must be greater than zero. The default is 1E–5.
	error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
	adaptive filter out returns the adaptive filter that this VI creates.
	error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

Example

Refer to the Convergence Speed and Computation Time of Adaptive Filters VI in the labview\examples\Adaptive Filters\Getting Started directory for an example of using the AFT Create FIR QR-RLS VI.