Germany: PhD position at Deutsche Telekom (audiovisual speech communication)

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“Evaluation of interactive audiovisual speech communication”

Our goal is to investigate the impact of degradations of interactive
IP-based applications such as VoIP that can only be assessed in a
conversational situation, or that affect a conversation in a specific
way. One prominent example is that of transmission delay, where the
turn-taking of participants may be degraded, although the transmitted
speech and video signals can be of high quality. The addressed services
are two-party VoIP, multiparty audio-conferencing, video-telephony, and

* Adapt and combine existing systems for VoIP & videotelephony
* Identify transmission-related technological degradations of relevance
for interactive multimedia services.
* Identify conversation-related perceptual cues that may be affected by
these degradations.
* Identify, adapt, and develop methods for the evaluation of interactive
audiovisual speech communication services with human subjects,
reflecting identified cues.
* Determine quantitative relations between human performance and quality
perception during conversations when using interactive multimedia
applications, and develop corresponding prediction models.

The successful candidate holds a diploma or master’s degree in
Electrical Engineering, Computer Science, Communication Sciences,
Computer Linguistics, or a comparable field. For this position, genuine
interest in and knowledge of telecommunications, the willingness to work
in an international and interdisciplinary team, and the capability of
independent work are a must. Solid knowledge of acoustics or of video
technologies and programming in C or C++, and interest in auditory and
visual perception, as well as knowledge of the English language are
required. Prior knowledge of auditory or visual perception and
experience with MATLAB are a definite plus.


Deutsche Telekom Laboratories (T-Labs) is a joint scientific research
institute of Deutsche Telekom AG and Berlin Institute of Technology (TU
Berlin). We carry out pioneering research into innovative information
and telecommunication technologies, in particular addressing human
perception and interaction, networking and security issues. The
Laboratories are located on the campus of Berlin University of
Technology, with the goal of promoting the interaction between science
and business through physical proximity.

The Assessment of IP-based Applications Lab of Deutsche Telekom
Laboratories (Prof. Dr.-Ing. Alexander Raake) is a newly founded
research group, which carries out research on IP-based multimedia
applications and user perception. The work will be conducted in exchange
with other researchers working, for example, on parametric IPTV- and
video-telephony quality models, multimedia transmission, audio-rendering
and speech quality assessment, together with the Quality and Usability
Lab of Deutsche Telekom Laboratories (


How to apply
Applications including a CV, a motivation letter, copies of the most
important certificates, and indication of 2 references should be sent,
as soon as possible, to these two addresses:
Alexander Raake  (alexander.raake (a), AND
TU Berlin seeks to increase the percentage of female employees and
particularly encourages female candidates to apply. In case of equal
qualifications, female candidates will be preferred.
Handicapped candidates will be preferred in case of equal


Thanks for your consideration and kind regards


Alexander Raake
Assessment of IP-based Applications
Deutsche Telekom Laboratories
TU Berlin
Ernst-Reuter-Platz 7
10587 Berlin

Fon: +49-30-8353-58462
Fax: +49-30-8353-58409

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