TY - EJOUR
DO - 10.1109/78.324731
AB - Considers the construction of orthogonal time-varying filter banks. By examining the time domain description of the two-channel orthogonal filter bank the authors find it possible to construct a set of orthogonal boundary filters, which allows to apply the filter bank to one-sided or finite-length signals, without redundancy or distortion. The method is constructive and complete. There is a whole space of orthogonal boundary solutions, and there is considerable freedom for optimization. This may be used to generate subband tree structures where the tree varies over time, and to change between different filter sets. The authors also show that the iteration of discrete-time time-varying filter banks gives continuous-time bases, just as in the stationary case. This gives rise to wavelet, or wavelet packet, bases for half-line and interval regions
T1 - Orthogonal time-varying filter banks and wavelet packets
IS - 10
DA - 1994
AU - Herley, Cormac
AU - Vetterli, Martin
JF - IEEE Transactions on Signal Processing
SP - 2650-2663
VL - 42
EP - 2650-2663
ID - 33887
UR - http://infoscience.epfl.ch/record/33887/files/HerleyV94.pdf
ER -