TSA Lifter PSD VI

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Owning Palette: Advanced PSD VIs

Requires: Advanced Signal Processing Toolkit

Separates the harmonic peaks in the power spectral density (PSD) by computing the power cepstrum of the input PSD and filtering out unnecessary harmonic peaks in the power cepstrum. The word lifter is an anagram of the word filter.

Example

	lifter range specifies how many data points to remove around the selected peaks. The default is 8.
	PSD specifies information about the power spectral density. f0 specifies the lower boundary of the frequency range. df specifies the frequency increment. S(f) specifies the magnitude of the power spectral density.
	base t specifies the position of base peak in harmonic families. Each element of the array represents one base peak of a harmonic family.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	dB on? specifies to express PSD in decibels. The default is TRUE.
	liftered PSD returns information about the liftered power spectral density. f0 returns the lower boundary of the frequency range. df returns the frequency increment. S(f) returns the magnitude of the power spectral density.
	power cepstrum returns information about the calculated power cepstrum. t0 returns the lower boundary of the time range. dt returns the time increment. C(t) returns the resulting power cepstrum.
	error out contains error information. This output provides standard error out functionality.
	liftering mask returns information about the mask of the power cepstrum. t0 returns the lower boundary of the time range. dt returns the time increment. mask returns the position of the harmonics in the power cepstrum.

Example

Refer to the Lifter Power Spectral Density of Gearbox VI in the labview\examples\Time Series Analysis\TSAApplications directory for an example of using the TSA Lifter PSD VI.