Efficient audio coding using perfect reconstruction noncausal IIR filter banks

被引:8
|
作者
Creusere, CD
Mitra, SK
机构
[1] Naval Air Warfare Center, Weapons Division, China Lake
[2] Department of Electrical and Computer Engineering, University of California, Santa Barbara
来源
IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING | 1996年 / 4卷 / 02期
关键词
D O I
10.1109/89.486061
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this paper, we consider the problem of implementing perfect reconstruction modulated polyphase filter banks having infinite impulse response (IIR) subfilters in systems that must process infinite length 1-D inputs. This task is complicated by the fact that the synthesis bank needed to ensure perfect reconstruction in such a system generally has noncausal or reverse-time filter sections. To overcome this limitation, we develop a number of unique buffering schemes that make possible the implementation of such reverse-time filters with infinite length signals. For the important special case when the polyphase subfilters are allpass, we also present a method that allows for very efficient implementation of tree-structured filter banks and wavelet transforms. We then describe a wideband coding algorithm based largely on work done by Lokhoff and Johnston. Using this algorithm, we compare the performance of IIR filter banks with that of more conventional pseudo-QMF and tree-structured QMF banks. The results of these comparisons indicate that one of our filter banks-a tree-structured allpass bank-achieves slightly better performance than equivalent FIR banks in terms of rate and distortion (both objectively and subjectively measured) while requiring lower computational complexity.
引用
收藏
页码:115 / 123
页数:9
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