An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification


Dorran, David and Coyle, Eugene and Lawlor, Bob (2004) An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification. In: 7th International Conference on Digital Audio Effects (DAFX-04), October 5-8, 2004, Naples, Italy.

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Abstract

Phase vocoder approaches to timescale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate timescale factors, by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load within the range of time-scaling factors for which phasi-ness is reduced.

Item Type: Conference or Workshop Item (Paper)
Keywords: Phasiness Reduction Technique; Moderate Audio Time-scale Modification; Phase vocoder; short-time Fourier transform (STFT);
Academic Unit: Faculty of Science and Engineering > Electronic Engineering
Item ID: 8831
Depositing User: Robert Lawlor
Date Deposited: 14 Sep 2017 09:24
Refereed: Yes
URI:

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