Title :
M-band perfect-reconstruction linear-phase filter banks
Author :
Xie, X.M. ; Chan, S.C. ; Yuk, T.I.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper studies the design of M-channel perfect-reconstruction (PR) linear-phase (LP) filter banks (FBs) with M=2k using a tree-structured FB. It is based on a observation of Fliege(1995) that the length of the analysis filters is decreased by a factor of two when the depth of the tree is increased by one, while its transition bandwidth is increased by the same factor. A lattice-based 2-channel LP FB is chosen because the frequency responses of the lowpass and highpass analysis (synthesis) filters can be designed to be closely symmetric to the other around π/2. By properly selecting the filter length, transition bandwidth. and stopband attenuation of the 2-channel PR LP FBs at each level of the tree structure, it is possible to design uniform PR LP FB with excellent frequency characteristic and much lower system delay
Keywords :
channel bank filters; digital filters; frequency response; lattice filters; linear phase filters; low-pass filters; network synthesis; signal reconstruction; M-band perfect-reconstruction filter banks; analysis filter length; analysis filters; filter banks design; frequency response; highpass filters; lattice-based 2-channel filter bank; linear-phase filter banks; lowpass filters; stopband attenuation; synthesis filters; system delay; transition bandwidth; tree depth; tree structure; tree-structured filter banks; Attenuation; Bandwidth; Channel bank filters; Delay systems; Filter bank; Frequency synthesizers; Image reconstruction; Signal processing; Signal synthesis; Tree data structures;
Conference_Titel :
Statistical Signal Processing, 2001. Proceedings of the 11th IEEE Signal Processing Workshop on
Print_ISBN :
0-7803-7011-2
DOI :
10.1109/SSP.2001.955354
