Speech recognition for safe maritime traffic

By using computer-based speech recognition, researchers at the Fraunhofer IDMT aim to contribute to improved safety in maritime traffic.

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Industry 4.0 learns how to hear

Joint project ACME 4.0 launched. How can acoustic sensors be used to make industrial installations more intelligent, safer and more efficient?

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Better speech intelligibility for TV broadcasts

The measuring instrument manufacturer RTW and scientists from the Fraunhofer IDMT are developing a new analysis tool for sound engineers as part of the »SI4B« research project.

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Understanding more easily

AdaptDRC-software adapts speech to ambient noise level.

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Project Group Hearing, Speech and Audio Technology

News and Upcoming Events

Press Release / 20.12.2017

Audio technology for Deutsche Telekom’s smart speaker

Enter speech commands and listen to music at the same time

Press Release / 24.10.2017

Soundbar reduces listening effort

Study compares speech intelligibility and sound quality of home entertainment products

Research Areas


Hearing Perception and Sound Quality

Psychoacoustic evaluation parameters allow reliable determination of how variations in product characteristics affect sound quality


Enhancement of Speech Intelligibility

Scientists at Fraunhofer IDMT develop software solutions which automatically analyse and optimise the intelligibility of speech – for applications ranging from railway station announcements and mobile phone calls through to car navigation systems


Hearing Assistance for Telephone and Consumer Electronics

The Fraunhofer researchers develop adaptation methods and user interfaces so that persons with both normal and impaired hearing can adjust the audio output to their personal hearing needs themselves at any time


Audio System Technology and Signal Processing

The Project Group can call on many years of expertise in audio system technology – ranging from signal recording with microphone arrays and signal processing methods through to transmission technology


Speech Recognition

Speech detection systems allow operation of technical systems without visual or physical contact. The speech recognition technology of the Fraunhofer Project Group functions robustly and without an internet connection


Acoustic Monitoring

Using machine learning methods such as neural networks, the Fraunhofer researchers work on teaching computers the complex skill of hearing. Audio signal processing is modelled here on human hearing processes


Evaluation and User Studies

A central aspect of assistive technology development is integration of users. A database with over 2,400 test persons is available at the Oldenburg location for evaluation studies

Range of Services

© Photo LÓreal, Boettcher
  • Research cooperations, development services and consulting
  • Contract research up to prototype production
  • Customer-specific adaptation of Fraunhofer developments
  • Measuring and evaluation methods
  • Evaluation and user studies

More Information

The goal of the Project Group for Hearing, Speech and Audio Technology of the Fraunhofer Institute for Digital Media Technology IDMT is to implement scientific findings on auditory perception of normal and impaired hearing in technological applications. Main research is improving speech intelligibility, personalized audio reproduction in consumer electronics as well as computer-based recognition of speech and acoustic events.

The project group was established in Oldenburg in 2008 as a branch of the Fraunhofer Institute for Digital Media Technology IDMT.Through scientific cooperations, it has close links with the Carl von Ossietzky University of Oldenburg, the Jade University of Applied Sciences Wilhelmshaven/Oldenburg/Elsfleth and other hearing research facilities in Oldenburg and is also a partner in the cluster of excellence »Hearing4all«.

Contact Persons

Jens-E. Appell

Contact Press / Media

Dr. rer. nat. Jens-E. Appell

Head of Department Project Group Hearing, Speech and Audio Technology

Fraunhofer Institute for Digital Media Technology IDMT
Marie-Curie-Straße 2
26129 Oldenburg

Phone +49 441 2172-401

Fax +49 441 2172-450

Birger Kollmeier

Contact Press / Media

Prof. Dr. rer. nat. Dr. med. Birger Kollmeier

Head of Project Group Hearing, Speech and Audio Technology

Fraunhofer Institute for Digital Media Technology IDMT
Marie-Curie-Straße 2
26129 Oldenburg, Germany

Phone +49 441 2172-301

Fax +49 441 2172-450

Christian Colmer

Contact Press / Media

Christian Colmer

PR & Marketing

Fraunhofer Institute for Digital Media Technology IDMT
Marie-Curie-Straße 2
26129 Oldenburg, Germany

Phone +49 441 2172-436

Fax +49 441 2172-450



At the Oldenburg location, the Fraunhofer Project Group has access to different laboratories and special rooms for evaluation studies as part of the cooperation with the Haus des Hörens and the University of Oldenburg



Hearing, Speech and Audio Technology

Research Fields and Services




Marie-Curie-Straße 2
26129 Oldenburg, Germany
Phone +49 441 2172-400
Fax +49 441 2172-450