A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphonesâ€Â'Part II: Performance Evaluation

Autor: Rudolf Häusler, Marco Pelizzone, Joachim Müller, Pascal Senn, Matthias Bertram, Martin Kompis
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Zdroj: EURASIP Journal on Advances in Signal Processing, Vol 2008 (2008)
Druh dokumentu: article
ISSN: 1687-6172
1687-6180
DOI: 10.1155/2008/451273
Popis: Users of cochlear implants (auditory aids, which stimulate the auditory nerve electrically at the inner ear) often suffer from poor speech understanding in noise. We evaluate a small (intermicrophone distance 7 mm) and computationally inexpensive adaptive noise reduction system suitable for behind-the-ear cochlear implant speech processors. The system is evaluated in simulated and real, anechoic and reverberant environments. Results from simulations show improvements of 3.4 to 9.3 dB in signal to noise ratio for rooms with realistic reverberation and more than 18 dB under anechoic conditions. Speech understanding in noise is measured in 6 adult cochlear implant users in a reverberant room, showing average improvements of 7.9–9.6 dB, when compared to a single omnidirectional microphone or 1.3–5.6 dB, when compared to a simple directional two-microphone device. Subjective evaluation in a cafeteria at lunchtime shows a preference of the cochlear implant users for the evaluated device in terms of speech understanding and sound quality.
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