DISCRETE WAVELET TRANSFORM APPARATUS OF A LATTICE TREE

摘要

PURPOSE: A discrete wavelet transform apparatus is provided to perform a transformation of all resolution levels by use of a quadrature mirror filter bank of a lattice tree. CONSTITUTION: The discrete wavelet transform (DWT) apparatus (100) comprises: a plurality of serial-connected lattice stages (PE0,..., PEm-1); delay adjusters (24) inserted between each lattice; and a data form converter (DFC) (23) installed between feedback output (S¬j(1)) and an input (u(n)) and a first lattice stage (PE0). Between the input (u(n)) and the data form converter (23), a multiplier (s) is installed as a scale factor. And the multiplier (s) is installed at a previous stage of the data form converter (23) so as to reduce the number of the multipliers.