Improved Design of Oversampled Allpass Transformed DFT Filter-Banks with Near-Perfect Reconstruction
Löllmann H, Vary P (2007)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2007
Event location: Poznan
ISBN: 978-839-2134-04-6
Abstract
In this paper, the design of oversampled allpass transformed analysis-synthesis filter-banks is treated, which can be employed for non-uniform subband processing. Near-perfect reconstruction can be achieved by a synthesis filter-bank design which uses phase equalizers to compensate the phase modifications due to the allpass transformation of the analysis filter-bank. It is shown that an FIR phase equalizer, which is obtained by a least-squares approximation of the desired non-causal IIR phase equalizer, leads to almost perfect signal reconstruction and causes only a comparatively low signal delay. The devised synthesis filter-bank design can be described by a closed-form expression and allows to control the trade-off between reconstruction errors on the one hand and signal delay and computational complexity on the other hand.
Authors with CRIS profile
How to cite
APA:
Löllmann, H., & Vary, P. (2007). Improved Design of Oversampled Allpass Transformed DFT Filter-Banks with Near-Perfect Reconstruction. In EURASIP (Eds.), Proceedings of the European Signal Processing Conference (EUSIPCO). Poznan, PL.
MLA:
Löllmann, Heinrich, and Peter Vary. "Improved Design of Oversampled Allpass Transformed DFT Filter-Banks with Near-Perfect Reconstruction." Proceedings of the European Signal Processing Conference (EUSIPCO), Poznan Ed. EURASIP, 2007.
BibTeX: Download