QMF TWO-CHANNEL IIR ORTHOGONAL FILTER BANKS WITH NO AMPLITUDE DISTORTION

概要

論文の詳細を見る
Multirate systems and filter banks have found numerous applications especially in speech processing and image compression and are related to the wavelet concept. Some interest is also emerging for digital communications such as wireless mobile communications[1] where some challenging difficulties like fading and multipath are present. The two-channel QMF bank as well as generalizations cascades in a binary tree structure leading to the wavelet packet theory[2] can offer an efficient signal coding system to combat these effects. Often, the filters used in the bank are FIR and Perfect-reconstruction is possible (amplitude and phase). In this paper, IIR filters are used, resulting in a lower order thus in faster operations, where only amplitude distortion is fixed. The phase can be adjusted with a simple equalization scheme. Implementations are shown for both the analysis and the synthesis banks leading to the desired goal sometimes even under multiplier quantization.
社団法人電子情報通信学会の論文
1996-09-18