Title :
Novel approach to the design of weighted minimax quadrature mirror filters
Author :
Vinod, A.P. ; Premkumar, A.B. ; Tong, Lau Chiew
Author_Institution :
Sch. of Comput. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
The weighted least squares (WLS) algorithm is widely employed for designing quadrature mirror filters (QMF) in the frequency domain. The equiripple nature of the WLS design and its performance near the filter band edge have been reported to be better than that of the least squares (LS) design. It is known that these design techniques suffer from pass-band anomaly under different stop band frequencies. We have proposed an algorithm to eliminate pass-band anomaly of LS design. In this paper, we show that WLS can be modified in way similar to that proposed for the LS design. The characteristics of the resulting filters satisfy the stop band requirements and do not show anomaly in the pass band region
Keywords :
frequency-domain synthesis; least squares approximations; minimax techniques; network synthesis; quadrature mirror filters; LS design; WLS; equiripple behaviour; filter band edge; frequency domain; least squares design; pass band region; pass-band anomaly; quadrature mirror filter design; stop band frequencies; weighted least squares algorithm; weighted minimax quadrature mirror filters; Algorithm design and analysis; Band pass filters; Filter bank; Frequency domain analysis; Frequency response; Least squares methods; Low pass filters; Minimax techniques; Mirrors; Signal processing algorithms;
Conference_Titel :
Signal Processing and its Applications, Sixth International, Symposium on. 2001
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6703-0
DOI :
10.1109/ISSPA.2001.949768
