Optimization-based reproduction of diffuse audio objects

Franck, Andreas, Fazi, Filippo Maria and Melchior, Frank (2015) Optimization-based reproduction of diffuse audio objects. IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA 2015), New York, United States. 18 - 21 Oct 2015. 14 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The creation of a diffuse sound event from a single audio signal is an important signal processing task, for instance in spatial audio reproduction or audio coding. Current algorithms based on decorrelation filters or frequency-dependent panning typically cause artifacts due to transients or time-domain aliasing. In this paper, we propose an optimization-based approach to diffusion that creates a set of filters to approximate a desired distribution of frequency-dependent propagation directions to create the perception of a diffuse sound field with a multi-channel audio system. Thus, the diffusion can be optimally adapted to a specific reproduction scenario. In addition, the transient response can be purposefully improved by imposing constraints on the time-domain filter coefficients.

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Submitted date: 21 April 2015

Accepted/In Press date: 26 June 2015

Published date: 18 October 2015

Additional Information: The authors confirm that all code and data underlying the findings are fully available without restriction. Details of the data and how to request access are available through the DOI 10.15126/surreydata.00808086

Venue - Dates: IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA 2015), New York, United States, 2015-10-18 - 2015-10-21

Keywords: Diffuseness, Decorrelation, Spatial Audio, Convex Optimization, Filter Design

Organisations: Acoustics Group