Optimal Design of IIR All-Pass Filters and Filter Banks Based on L-infinite Criterion

• Main Authors: Yang, Yuan-Hau, 楊元豪
• Other Authors: Lee, Ju-Hong
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/39424859461508032538

碩士 === 國立臺灣大學 === 電信工程學研究所 === 91 === Owing to the increasing use of digital signal processing, the design of digital filters and filter banks plays an important role in this field. The work of this thesis is to devise novel and efficient techniques for optimally designing digital filters and QMF banks based on IIR all-pass filters. With the aid of WLS and Karmarkar’s algorithms, several minimax design methods are proposed. The resulting two-channel QMF banks can possess approximately linear phase response without magnitude distortion. The effectiveness of the proposed techniques is achieved by forming an appropriate Chebyshev approximation of a desired phase response and then to find its solution from a linear subspace in a few iterations. From the simulation examples demonstrated in each chapter of this thesis, the satisfactory and efficient design results can be confirmed.