Wavelet Packet VIs

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Owning Palette: Wavelet Analysis VIs

Requires: Advanced Signal Processing Toolkit. This topic might not match its corresponding palette in LabVIEW depending on your operating system, licensed product(s), and target.

Use the Wavelet Packet VIs to compute various wavelet packet analyses, such as wavelet packet decomposition, wavelet packet reconstruction, and various operations on the wavelet packet tree.

The VIs on this palette can return general LabVIEW error codes or specific Wavelet Analysis error codes.

Palette ObjectDescription
WA Create WP SessionCreates a new wavelet packet (WP) structure and returns a reference to it. Use this VI as the first step to perform wavelet packet analyses. Use the WA Dispose WP Session VI to dispose of the reference.
WA Dispose WP SessionDisposes the reference of the wavelet packet (WP) structure the WA Create WP Session VI created.
WA WP Best TreeSearches for the optimal decomposition tree based on the minimum entropy criterion, which is the smallest value of the total entropy of all terminal nodes at a certain level in all the possible tree structures.
WA WP DecompositionComputes the 1D wavelet packet (WP) decomposition and stores the resulting coefficients and wavelet packet tree information in the wavelet packet structure. Wire data to the signal input to determine the polymorphic instance to use or manually select the instance.
WA WP JoinReconstructs the wavelet packet (WP) coefficients of the node that path specifies. The node that path specifies must not be a terminal node of the wavelet packet tree.
WA WP Plot TreePlots the whole tree structure of the wavelet packet (WP) tree in a picture control. You can show the node information of path, position, or entropy on each node of the wavelet packet tree.
WA WP Read EntropyReads the entropy of the wavelet packet (WP) coefficients of a node that path specifies.
WA WP Read NodeReads the wavelet packet (WP) coefficients of a terminal node that path specifies. If you want to read the coefficients of a non-terminal node, use the WA WP Join VI to convert the node to a terminal node.
WA WP Read Tree StructureReads the tree structure information of the terminal nodes in the wavelet packet (WP) tree and returns the node indexes and the associated paths of the terminal nodes.
WA WP ReconstructionComputes the 1D wavelet packet (WP) reconstruction from the wavelet packet tree and coefficients. You must manually select the polymorphic instance to use.
WA WP SplitSplits the terminal node that path specifies into two children nodes.
WA WP Write NodeWrites the wavelet packet (WP) coefficients to a terminal node that path specifies. If you want to write coefficients to a non-terminal node, use the WA WP Join VI to convert the node to a terminal node.
Wavelet Packet AnalysisDecomposes the signal according to the tree structure you specify and reconstructs the signal from the nodes you specify. This VI also returns the coefficients and the entropies of the nodes you select.

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