In this paper, we propose a time-frequency representation where the frequency bins are distributed uniformly in log-frequency and their Q-factors obey a linear function of the bin center frequencies. The latter allows for time-frequency representations where the bandwidths can be e.g. constant on the log-frequency scale (constant Q) or constant on the auditory critical-band scale (smoothly varying Q). The proposed techniques are published as a Matlab toolbox that extends [3]. Besides the features that stem from [3] - perfect reconstruction and computational efficiency - we propose here a technique for computing coefficient phases in a way that makes their interpretation more natural. Other extensions include flexible control of the Q values and more regular sampling of the time-frequency plane in order to simplify signal processing in the transform domain.

Authors: Schörkhuber, Christian; Klapuri, Anssi; Holighaus, Nicki; Dörfler, Monika
Affiliations: Austrian Academy of Sciences, Vienna, Austria; Tampere University of Technology, Tampere, Finland; University of Music and Performing Arts Graz, Graz, Austria; University of Vienna, Vienna, Austria(See document for exact affiliation information.)
AES Conference: 53rd International Conference: Semantic Audio (January 2014)
Paper Number: P2-5
Publication Date: January 27, 2014 Import into BibTeX
Subject: Audio Signal Processing and Feature Extraction
Permalink: http://www.aes.org/e-lib/browse.cfm?elib=17112

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