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Dual-tree and double-density 1-D wavelet transform

returns
the `wt`

= dddtree(`typetree`

,`x`

,`level`

,`fdf`

,`df`

)`typetree`

discrete wavelet transform (DWT)
of the 1-D input signal, `x`

, down to level, `level`

.
The wavelet transform uses the decomposition (analysis) filters, `fdf`

,
for the first level and the analysis filters, `df`

,
for subsequent levels. Supported wavelet transforms are the critically
sampled DWT, double-density, dual-tree complex, and dual-tree double-density
complex wavelet transform. The critically sampled DWT is a filter
bank decomposition in an orthogonal or biorthogonal basis (nonredundant).
The other wavelet transforms are oversampled filter banks.

uses
the filters specified in `wt`

= dddtree(`typetree`

,`x`

,`level`

,`fname1`

,`fname2`

)`fname1`

for the first
stage of the dual-tree wavelet transform and the filters specified
in `fname2`

for subsequent stages of the dual-tree
wavelet transform. Specifying different filters for stage 1 is valid
and necessary only when `typetree`

is `'cplxdt'`

or `'cplxdddt'`

.

`dddtree2`

| `dddtreecfs`

| `dtfilters`

| `idddtree`

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