Title :
Oversampled biorthogonal cosine-modulated filter bank realization using a critically constrained lifting scheme
Author :
Riel, B. ; Shpak, D.J. ; Antoniou, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada
Abstract :
Oversampled filter banks have received much attention recently due to the advantages they offer over critically sampled filter banks. These include increased error-resilient coding, the existence of non-unique perfect reconstruction synthesis banks, and an improved noise shaping capability. This paper introduces an implementation method utilizing a lifting scheme that allows perfect reconstruction. The proposed lifting scheme factorizes the analysis and synthesis polyphase matrices into zero-delay and maximum-delay lifting matrices, which allows for perfect reconstruction even for integer-coefficient implementations.
Keywords :
channel bank filters; matrix decomposition; modulation; biorthogonal cosine modulated filter banks; critically constrained lifting scheme; critically sampled filter banks; maximum delay lifting matrices; oversampled cosine modulated filter banks; polyphase matrices; zero delay lifting matrices; Computer errors; Delay systems; Discrete Fourier transforms; Discrete transforms; Filter bank; Fourier transforms; Noise shaping; Prototypes; Sampling methods; Signal synthesis;
Conference_Titel :
Circuits and Systems, 2004. NEWCAS 2004. The 2nd Annual IEEE Northeast Workshop on
Print_ISBN :
0-7803-8322-2
DOI :
10.1109/NEWCAS.2004.1359087
