Blind separation of incoherent and spatially disjoint sound sources

Journal article


Publication Details

Author(s): Dong B, Antoni J, Pereira A, Kellermann W
Journal: Journal of Sound and Vibration
Publication year: 2016
Volume: 383
Pages range: 414-445
ISSN: 0022-460X
Language: English


Abstract

Blind separation of sound sources aims at reconstructing the individual
sources which contribute to the overall radiation of an acoustical
field. The challenge is to reach this goal using distant measurements
when all sources are operating concurrently. The working assumption is
usually that the sources of interest are incoherent – i.e. statistically
orthogonal – so that their separation can be approached by
decorrelating a set of simultaneous measurements, which amounts to
diagonalizing the cross-spectral matrix. Principal Component Analysis
(PCA) is traditionally used to this end. This paper reports two new
findings in this context. First, a sufficient condition is established
under which “virtual” sources returned by PCA coincide with true
sources; it stipulates that the sources of interest should be not only
incoherent but also spatially orthogonal. A particular case of this
instance is met by spatially disjoint sources – i.e. with
non-overlapping support sets. Second, based on this finding, a criterion
that enforces both statistical and spatial orthogonality is proposed to
blindly separate incoherent sound sources which radiate from disjoint
domains. This criterion can be easily incorporated into acoustic imaging
algorithms such as beamforming or acoustical holography to identify
sound sources of different origins. The proposed methodology is
validated on laboratory experiments. In particular, the separation of
aeroacoustic sources is demonstrated in a wind tunnel.


FAU Authors / FAU Editors

Kellermann, Walter Prof. Dr.-Ing.
Professur für Nachrichtentechnik


How to cite

APA:
Dong, B., Antoni, J., Pereira, A., & Kellermann, W. (2016). Blind separation of incoherent and spatially disjoint sound sources. Journal of Sound and Vibration, 383, 414-445. https://dx.doi.org/10.1016/j.jsv.2016.07.018

MLA:
Dong, B., et al. "Blind separation of incoherent and spatially disjoint sound sources." Journal of Sound and Vibration 383 (2016): 414-445.

BibTeX: 

Last updated on 2018-06-12 at 13:50