Introduction ▶ Speech enhancement or beamforming algorithms require the noise Power Spectral Density (PSD). ▶ Many multichannel noise PSD estimation algorithms require some knowledge on sound sources: Number of sources (Many sources are possibly present, time varying) Directivities (Can be unknown) ▶ Additionally many assume that the noise field is diffuse and homogeneous (The noise field could be inhomogeneous). Motivation
Performance measure ▶ Other multichannel algorithms that can’t be included as a subcases involve knowledge on the sources directivities. Not fair! ▶ Single channel algorithms don’t use information on directivities. Comparison with single channel algorithms
Performance measure ▶ Problems with comparison: o Single channel algorithms estimate only diagonal elements of the correlation matrix Comparison with single channel algorithms
Performance measure Cont’d Comparison with reference noise correlation matrix
Performance measure Cont’d Channels Image courtesy of [Kayser et al., 2009]
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