Least-Squares Design of Subsampled Allpass Transformed DFT Filter-Banks with LTI Property
Löllmann H, Dartmann G, Vary P (2008)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2008
Pages Range: 3529–3532
Event location: Las Vegas
ISBN: 978-1-42441-483-3
Abstract
A new design approach for an allpass transformed analysis-synthesis filter-bank (AS FB) with subsampling is proposed, which can be used for adaptive subband processing with non-uniform time-frequency resolution. Signal reconstruction is performed by an FIR synthesis filter-bank whose coefficients are determined by two different linear least-squares (LS) error designs. The presented unconstrained LS optimization leads to perfect reconstruction (PR), but an insufficient bandpass characteristic for the synthesis subband filters. This problem is solved by a second, equality constrained least-squares (CLS) error design, which achieves near-perfect reconstruction (NPR). In the process, the linear distortions are minimized with the constraint for a linear, time-invariant (LTI) overall transfer function. The aliasing-free reconstruction error is significantly lower than for known designs of allpass transformed DFT filter-banks with NPR. Moreover, the new filter-bank design allows for a low and adjustable signal delay.
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How to cite
APA:
Löllmann, H., Dartmann, G., & Vary, P. (2008). Least-Squares Design of Subsampled Allpass Transformed DFT Filter-Banks with LTI Property. In Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) (pp. 3529–3532). Las Vegas, US.
MLA:
Löllmann, Heinrich, Guido Dartmann, and Peter Vary. "Least-Squares Design of Subsampled Allpass Transformed DFT Filter-Banks with LTI Property." Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Las Vegas 2008. 3529–3532.
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