Title :
Cosine-modulated analysis-synthesis filterbank with critical sampling and perfect reconstruction
Author :
Ramstad, Tor A. ; Tanem, Joar P.
Author_Institution :
Dept. of Electr. & Comput. Eng., Norwegian Inst. of Technol., Trondheim, Norway
Abstract :
The authors present a simple derivation of a parallel filterbank based on cosine-modulated versions of a model low-pass filter. With a nonuniform channel separation an efficient implementation consisting of a DFT (discrete Fourier transform) related transform and subfilters is possible. Using critical sampling of each channel and FIR (finite impulse response) filters, the conditions for perfect reconstruction are given. The computational complexity of the derived FIR filterbank is much lower than for a tree-structured FIR filterbank but cannot compete with the most efficient IIR filterbanks
Keywords :
digital filters; fast Fourier transforms; filtering and prediction theory; low-pass filters; signal processing; DFT related transform; FIR filterbank; analysis-synthesis filterbank; computational complexity; cosine-modulated versions; critical sampling; discrete Fourier transform; finite impulse response; model low-pass filter; nonuniform channel separation; parallel filterbank; perfect signal reconstruction; signal processing; subfilters; Channel bank filters; Decoding; Discrete transforms; Filter bank; Finite impulse response filter; Frequency synthesizers; IIR filters; Sampling methods; Signal analysis; Signal synthesis;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150684
