DocumentCode :
293021
Title :
High-performance IIR QMF banks for speech subband coding
Author :
Jiang, Zhongnong, Jr. ; Alwan, Abeer ; Willson, Alan N., Jr.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Volume :
2
fYear :
1994
fDate :
30 May-2 Jun 1994
Firstpage :
493
Abstract :
In this paper, two high-performance implementations of IIR QMF banks for speech coding are proposed. The first implementation involves a perfect reconstruction (PR) QMF bank while the second is a tree-structured filter bank. In contrast to existing implementations of PR QMF banks, our approach does not require the transmission of initial conditions nor the design of synthesis filters which are more complex than their analysis counterparts. In systems with delay constraints, the tree structured IIR QMF bank can be used; a 4-channel scheme shows a low delay of about 1.9 ms (15 samples) at an 8 kHz sampling rate. No existing FIR QMF banks can achieve this low delay. Moreover, the phase distortion of the low-delay filter bank does not appear to affect the perceptual quality of the processed speech signals. Subjective tests were conducted to evaluate the speech quality
Keywords :
Delay systems; Filter bank; Finite impulse response filter; IIR filters; Phase distortion; Signal processing; Signal sampling; Speech coding; Speech processing; Speech synthesis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
Type :
conf
DOI :
10.1109/ISCAS.1994.409033
Filename :
409033
Link To Document :
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