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148
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Distributed Microphone Array Signal Processing
for Hearing Aids
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Doclo Simon
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1
Institute of Physics - Signal Processing Group, University of Oldenburg, Germany
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Microphone arrays have become essential for performing noise reduction and source localization in a broad
range of speech communication applications, such as hands-free mobile telephony, videoconferencing systems
and hearing aids. Whereas in many applications the microphones are wired, the position of the microphones in
the array is fixed and all signal processing is performed on a centralized processor, in some applications several
microphone arrays are exchanging information with each other, e.g. using a wireless link, and are cooperating
in order to achieve a common objective. In this talk, we will present some recent developments in the area of
distributed signal processing for such acoustic sensor networks. As a prototype example, we will focus on signal
enhancement for binaural hearing aids, where the objective is not only to selectively extract the useful speech
signal and suppress background noise, but also to preserve the binaural localization cues of the sound sources, so as to preserve the auditory impression of the acoustic scene and exploit the binaural hearing advantage. In addition, we will discuss the influence of the available capacity of the wireless link on the performance of these
signal enhancement algorithms.
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