@conference {Prelcic00b, title = {New Orthogonal Extension Methods for Tree-Structured Filter Banks}, booktitle = {European Signal Processing Conference (EUSIPCO)}, year = {2000}, month = {September}, address = {Tampere, Finland}, author = {M. Elena Dom{\'\i}nguez-Jim{\'e}nez and Nuria Gonz{\'a}lez-Prelcic} }