An example of a three-level signal reconstruction algorithm is
shown in Figure
Discrete Wavelet Reconstruction"
. The scheme corresponds to the
decomposition scheme described in the section of the description of the forward
. Therefore, for the inverse transform the
biorthogonal set of spline filters with respective filter length of 6 and 2 is used.
The lowest level filter delays are set to
= 0. The total delay
at this stage of reconstruction is equal to two samples. In order to ensure an
equivalent delay of the “detail” part in the middle level, the delay must be
increased. Respective values of additional delays for the second level are equal to
+ 2*2 = 4.
A greater value of high frequency component delay needs to be selected for the last
level of reconstruction,
+ 2*4 = 12.