AFT Filtered-X Filter Signal and Update Coefficients VI

LabVIEW 2013 Adaptive Filter Toolkit Help

Edition Date: June 2013

Part Number: 372357B-01

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Owning Palette: Filtered-X Adaptive Filter VIs

Requires: Adaptive Filter Toolkit

Processes an input signal with an adaptive filter you create by using the AFT Create FIR Filtered-X LMS or AFT Create FIR Normalized Filtered-X LMS VI.


reset? specifies whether to reset the internal states and coefficients of the adaptive filter to zeroes. The default is FALSE.
filtered-x adaptive filter in specifies the filtered-x adaptive filter that you create.
x(n) specifies the input signal x(n) to the adaptive filter.
e(n) specifies the error signal e(n) of the adaptive filter.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
step size specifies the step size value for the filtered-x adaptive filter. If this value is less than zero, this VI ignores this parameter and uses the step size that you specify when you create the adaptive filter. If this value is zero, this VI processes the input signal without updating the coefficients of the adaptive filter. If this value is greater than zero, this VI uses this value as the step size to update the coefficients of the adaptive filter. The default is –1.
Note  If the filtered-x adaptive filter uses the normalized filtered-x LMS algorithm, the value must be less than 2.
filtered-x adaptive filter out returns the filtered-x adaptive filter in unchanged.
y(n) returns the output signal from the filtered-x adaptive filter.
error out contains error information. This output provides standard error out functionality.


Refer to the following VIs for examples of using the AFT Filtered-X Filter Signal and Update Coefficients VI:

  • Active Noise Control (Simulated) VI: labview\examples\Adaptive Filters\Applications\Active Noise Control
  • Use Filtered-X LMS Adaptive Filter VI: labview\examples\Adaptive Filters\Getting Started


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