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Title: Speech understanding in background noise with the two-microphone adaptive beamformer BEAMTM in the Nucleus FreedomTM cochlear implant system
Authors: Van Deun, Lieselot
Spriet, Ann
Eftaxiadis, K
Laneau, J
Moonen, Marc
van Dijk, B
Van Wieringen, Astrid
Wouters, Jan #
Issue Date: Mar-2006
Host Document: Proc. Nederlands Akoestisch Genootschap (NAG) issue:178 pages:1-9
Conference: NAG-NVA studiedag location:Utrecht, The Netherlands date:15/03/2006
Abstract: Speech understanding in noisy conditions (daily real-life listening environments) is for cochlear implants in general an even bigger problem than for hearing aid users. We have been focussing in our research on multi-microphone configurations combined with adequate signal processing for behind-the-ear (BTE) applications. Using 2 microphones and additional adaptive signal processing with limited complexity (feasible for cochlear implant systems), it has been shown that speech understanding in different types of jammer noises (multiple talkers) and sound scenes (sounds simultaneously from different directions) can be improved. In moderately reverberant rooms improvements of about 10dB can be obtained for cochlear implants and a single jammer source, relative to a single directional microphone. Results and evaluations with cochlear implant subjects obtained with the an adaptive beamformer (or generalized sidelobe canceller) will be presented. This approach provides good results, significantly better than the adaptive zooms implemented in some hearing aids, and using low-complexity algorithms. This technique has recently been implemented in the Freedom cochlear implant system.
Description: \emph{Nederlands Akoestisch Genootschap}, NAG, no. 178, Mar. 2006
Publication status: published
KU Leuven publication type: IC
Appears in Collections:ESAT - STADIUS, Stadius Centre for Dynamical Systems, Signal Processing and Data Analytics
Research Group Experimental Oto-rhino-laryngology
# (joint) last author

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