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Open Access

Signal Processing in High-End Hearing Aids: State of the Art, Challenges, and Future Trends

  • V. Hamacher1Email author,
  • J. Chalupper1,
  • J. Eggers1,
  • E. Fischer1,
  • U. Kornagel1,
  • H. Puder1 and
  • U. Rass1
EURASIP Journal on Advances in Signal Processing20052005:152674

Received: 30 April 2004

Published: 10 November 2005


The development of hearing aids incorporates two aspects, namely, the audiological and the technical point of view. The former focuses on items like the recruitment phenomenon, the speech intelligibility of hearing-impaired persons, or just on the question of hearing comfort. Concerning these subjects, different algorithms intending to improve the hearing ability are presented in this paper. These are automatic gain controls, directional microphones, and noise reduction algorithms. Besides the audiological point of view, there are several purely technical problems which have to be solved. An important one is the acoustic feedback. Another instance is the proper automatic control of all hearing aid components by means of a classification unit. In addition to an overview of state-of-the-art algorithms, this paper focuses on future trends.

Keywords and phrases:

digital hearing aiddirectional microphonenoise reductionacoustic feedbackclassificationcompression

Authors’ Affiliations

Siemens Audiological Engineering Group, Gebbertstrasse 125, Erlangen, Germany


© V. Hamacher et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.