Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
M.M. Ekanayake , Dept. of Electr. & Comput. Eng., Miami Univ., Coral Gables, FL, USA
K. Premaratne , Dept. of Electr. & Comput. Eng., Miami Univ., Coral Gables, FL, USA
A computationally simple method to obtain IIR analysis and synthesis filters that possess negligible phase distortion is presented. It is shown that for a certain class of FIR filter banks, the polyphase components are approximately all-pass. By applying the balanced reduction procedure to the polyphase components of such an FIR prototype filter all-pass IIR polyphase components are obtained. The resulting IIR designs have negligible phase distortion. Design examples indicate that the derived IIR filter banks can be implemented more efficiently than the FIR prototypes. Results show that the IIR filters are better than linear phase perfect reconstruction systems when implemented in a finite wordlength processor.<
band-pass filters, quadrature mirror filters, IIR filters, delay circuits, all-pass filters, filtering theory
M. Ekanayake and K. Premaratne, "Two-Channel IIR QMF banks with approximately linear-phase analysis and synthesis filters," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 1005-1009.