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Audio Signal Processing for Cochlear Implants

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Cochlear implants are widely accepted as the most effective means of improving the auditory receptive abilities of people with profound hearing loss. Some cochlear implant recipients can now communicate without lip-reading or signing, and some can communicate over the telephone. Generally, these devices consist of a microphone, a speech processor, a transmitter, a receiver, and an electrode array which is positioned inside the cochlea. The speech processor is responsible for decomposing the input audio signal into different frequency bands or channels and delivering the most appropriate stimulation pattern to the electrodes. Electrodes near to the base of the cochlea transmit high-frequency information, whereas those near to the apex transmit low-frequency information.

The main goals of the project are to improve speech intelligibility in noise situations and to improve music perception with cochlear implants.

Although understanding in quiet situations is no longer a major problem for most cochlear implants recipients, hearing in noisy conditions is still severely limitied. Nevertheless, thechnical progress in signal processing for cochlear implants in recent past led to remarkable performance enhancements in device users. Therefore, we design new signal processing strategies for cochear implants. The new algorithms are tested with cochlear implant patients in the Hoerzentrum of the Medical University of Hannover.

[1] W. Nogueira, A. Buechner, Th. Lenarz, B. Edler,
"A Psychoacoustic NofM type speech coding strategy for cochlear implants", Eurasip Journal on Applied Signal Processing special issue on DSP in Hearing Aids and Cochlear Implants, Vol. 18, 3044-3059, November, 2005.
[2] W. Nogueira, A. Giese, B. Edler, A. Buechner,
"Wavelet Packet Filterbank for Speech Processing Strategies in Cochlear Implants", 2006 IEEE International Conference on Acoustics, Speech, and Signal Processing 14-19 Mai 2006, Toulouse, France.
[3] W. Nogueira, B. Edler, C. Frohne-Büchner, M. Brendel, A. Buechner,
"Sinusoidal Analysis of Audio for Current Steering Strategies in Cochlear Implants", CI-2006 - 9th International Conference on Cochlear Implants, June, 2006, Vienna, Austria.
[4] W. Nogueira, A. Buechner, B. Edler,
"Fundamental Frequency Coding in NofM Strategies for Cochlear Implants", Preprint 6515, 118th AES Convention, Barcelona, Spain, 2005.
[5] http://www.tnt.uni-hannover.de/~nogueira/cochlearimplants.php

Show all publications
  • Reemt Hinrichs, Tom Gajecki, Jörn Ostermann, Waldo Nogueira
    Coding of Electrical Stimulation Patterns for Binaural Sound Coding Strategies for Cochlear Implants
    41st International Engineering in Medicine and Biology Conference, July 2019
  • T Harczos, W Nogueira, G Szepannek, F Klefenz
    Comparative evaluation of successive cochlear modeling stages as possible frontends for automatic speech recognition
    19th Int. Congress on Acoustics ICA, Madrid, Spain, September 2007
  • Waldo Nogueira, Tamás Harczos, Bernd Edler, Joern Ostermann, Andreas Büchner
    Automatic Speech Recognition with a Cochlear Implant Front-End
    Interspeech, August 2007