Efficient Multi-Channel Acoustic Echo Cancellation Using Constrained Sparse Filter Updates in the Subband Domain

Konferenz: Speech Communication - 11. ITG-Fachtagung Sprachkommunikation
24.09.2014 - 26.09.2014 in Erlangen, Deutschland

Tagungsband: Speech Communication

Seiten: 4Sprache: EnglischTyp: PDF

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Autoren:
Desiraju, Naveen Kumar; Wolff, Tobias (Acoustic Speech Enhancement Research, Nuance Communications Deutschland GmbH, 89077 Ulm, Germany)
Doclo, Simon; Gerkmann, Timo (Dept. of Medical Physics and Acoustics, Signal Processing, 26111 Oldenburg, Germany)

Inhalt:
In this paper we present constrained sparse tap-selection schemes for updating Multi-Channel Acoustic Echo Cancellation (MAEC) filters in the subband domain. At first, M-Max tap-selection on the complete multi-channel reference spectra is performed and the effect of the subsequent sparse filter update on the speed of convergence of theMAEC filters is investigated. We consider a measure to quantify signal sparsity, and use it to investigate the spectral and inter-channel sparsity present in real-world surround sound signals. A heuristic tap-selection scheme is proposed which exploits the signal sparsity properties, and performs tap-selection with much lower computational effort as compared to the M-Max and the full-update tapselection schemes, while giving similar echo cancellation performance.