NAT or FRQ is for Natural or Frequency order.
By level or Global is for a coloration made level by level or taking all detail levels.
abs is used to take the absolute values of coefficients.
When you select a node in the tree, the selected option is performed. A complete description of options is provided in the following sections.
The node labels can be changed using the pop-up menu. For example, the Type option labels the nodes with (a) for approximation and (d) for detail.
The available options in the Node Action menu are
Visualize: When you select a node in the wavelet packet tree the corresponding signal appears.
Split/Merge: If a terminal node is selected, it is split, growing the wavelet packet tree. Selecting other nodes has the behavior of merging all the nodes below it in the wavelet packet tree.
Recons.: When you select a node in the wavelet packet tree, the corresponding reconstructed signal appears.
Select On/Off: When On, you can select many nodes in the wavelet packet tree. Then you can reconstruct a synthesized signal from the selected nodes using the Reconstruct button on the main window. Use the Off selection to deselect all the previous selected nodes.
Statistics: When you select a node in the wavelet packet tree, the Statistics tool appears using the signal corresponding to the selected node.
View Col. Cfs.: When active, this option removes all the colored coefficients displayed, and lets you redraw only the corresponding coefficients by selecting a node in the wavelet packet tree.