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TU Berlin

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Dr. Tim Polzehl

Crowdsourcing Technology

  • High-quality data collection via crowdsourcing
  • Data management and data services via crowdsourcing (clean, index, verify, tag, label, translate, summarize, join, etc. )
  • Data synthesis und data generation via crowdsourcing
  • Subjective influences and bias normalization in crowdsourcing
  • Crowd-creation, crowd-voting, crowd-storming, crowd-testing applications
  • Crowdsourcing service for machine learning and BI
  • Crowdsourcing business and Business Logic
  • Complex automated workflows: combining human and artificial intelligence
  • Crowdsourcing with mobile devices
  • Real-time crowdsourcing
  • Skill-based crowdsourcing and verification of crowd-experts


Speech Technology

  • Automatic user classification
  • Automatic speaker characterization (age, gender, emotion, personality) 
  • Automatic speech recognition (ASR),
  • Prosody and voice gesture recognition
  • Prosodic voice print analysis, phonetic science
  • App development with speech functionalities (Android, iOS)


Text Classification, Natural Language Processing (NLP)  

  • Sentiment Analysis
  • Affective Analysis, Emotion
  • Personality und Lifestyle Detection from Social-Networks (Twitter, FB, G+, etc.)


Machine Learning and Artificial Intelligence  

  • Automated user modelling
  • Classification and prediction systems using linear and non-linear algorithms
  • Feature selection and reduction
  • Evaluation and verification methods


Running and Past Projects:

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Project Biography 

Tim Polzehl studied Science of Communication at Berlin's Technical University. Combining linguistic knowledge with signal processing skills he focused on speech interpretation and automatic data- and metadata extraction. He gathered experience within the field of machine learning as exercised when recognizing human speech utterances and classifying emotional expression subliminal in speech, the latter of which became his M.A. thesis. 

In 2008 Tim Polzehl started his position as PhD candidate in Telekom Innovation Laboratories (T-Labs) and the Quality and Usability Lab. He worked in both industrial and academic projects with focus on speech technology, App-Development, machine learning crowd sourcing solutions.

2011-2013 Tim was leading a R&D Project for Telekom Innovation Laboratories with Applications in the field of Intelligent Customer-Care Systems and Speech-Apps.

2012-2014 Tim was awarded with an BMBF funded Education program for future IT and Development Leadership involving SAP, Software AG, Scheer Group, Siemens, Holtzbrinck, Bosch, Datev and Deutsche Telekom AG, amongst highly ranked academic institution (Softwarecampus).       

2014 Tim was awarded the PhD for his work on automatic prediction of personality attributes from speech.

Since 2014 Tim has been working as a Postdoc at the Quality and Usability chair of TU-Berlin. At the same time Tim is driving the start-up activity applying the earlier  development of crowdsourcing solutions Crowdee.



Quality and Usability Labs

Technische Universität Berlin

Ernst-Reuter-Platz 7

D-10587 Berlin

Tel.:+49 (30) 8353-58227Fax: +49 (30) 8353-58409

Openings / Supervision

please refer to here.



Polzehl, Tim and Möller, Sebastian and Metze, Florian (2010). Automatically Assessing Acoustic Manifestations of Personality in Speech. Workshop on Spoken Language Technology (SLT). IEEE, 1–6.

Link to publication

Polzehl, Tim and Schmitt, A. and Metze, F. (2010). Salient Features for Anger Recognition in German and English IVR Portals. Spoken Dialogue Systems Technology and Design. Springer, 81–110.

Polzehl, Tim and Schmitt, A. and Metze, F. (2010). Approaching Multi-Lingual Emotion Recognition from Speech - On Language Dependency of Acoustic/Prosodic Features for Anger Detection. SpeechProsody. University of Illionois, 1–6.

Schmitt, A. and Pieraccini, R. and Polzehl, Tim (2010). ``For Heaven's Sake, Gimme a Live Person!'' Designing Emotion-Detection Customer Care Voice Applications in Automated Call Centers. Advances in Speech Recognition. Springer US, 81–110.

Schmitt, A. and Polzehl, Tim and Minker, Wolfgang (2010). Modeling A-Priori Likelihoods for Angry User Turns with Hidden Markov Models. SpeechProsody. University of Illionoise, 1–6.

Schmitt, A. and Polzehl, Tim and Minker, Wolfgang (2010). Facing Reality: Simulating Deployment of Anger - Recognition in IVR Systems. Spoken Dialogue Systems for Ambient Environments - Lecture Notes in Computer Science. Springer, 23–48.

Schmitt, A. and Polzehl, Tim and Minker, Wolfgang and Liscombe, J. (2010). The Influence of the Utterance Length on the Recognition of Aged Voices. Proceedings of the Seventh conference on International Language Resources and Evaluation (LREC'10). European Language Resources Association (ELRA), 1–6.

Hinterleitner, Florian and Möller, Sebastian and Polzehl, Tim and Falk, Tiago H. (2010). Comparison of Approaches for Instrumentally Predicting the Quality of Text-to-Speech Systems: Data from Blizzard Challenges 2008 and 2009. Proceedings of the Blizzard Challenge Workshop. International Speech Communication Association (ISCA), 1–7.

Link to publication

Möller, Sebastian and Hinterleitner, Florian and Falk, Tiago H. and Polzehl, Tim (2010). Comparison of Approaches for Instrumentally Predicting the Quality of Text-To-Speech Systems. Proceedings of the 11th Annual Conference of the ISCA (Interspeech 2010). International Speech Communication Association (ISCA), 1–6.

Link to publication Link to original publication

Weiss, Benjamin and Möller, Sebastian and Polzehl, Tim (2010). Zur Wirkung menschlicher Stimme auf die wahrgenommene Sympathie – Einfluss der Stimmanregung. Elektronische Sprachsignalverarbeitung 2010. Tagungsband der 21. Konferenz. TUDpress, 1–6.

Link to publication


Polzehl, Tim and Möller, Sebastian and Metze, Florian (2011). Modeling Speaker Personality using Voice. Proc. 12th Ann. Conf. of the Int. Speech Communication Assoc. (Interspeech 2011). International Speech Communication Association (ISCA).

Link to publication

Metze, F. and Polzehl, Tim and Black, Alan (2011). A Review of Personality in Voice-Based Man Machine Interaction. Human-Computer Interaction. Interaction Techniques and Environments - 14th International Conference, HCI International 2011. Springer, 358–367.

Möller, Sebastian and Hinterleitner, Florian and Lewcio, Blazej and Polzehl, Tim (2011). Speech Quality Measurement and Prediction: NGMNs, TTS and Personality. Workshop Quality Perception in Conversational and Synthetic Speech

Polzehl, Tim and Schmitt, A. and Metze, F. and Wagner, M. (2011). Anger Recognition in Speech Using Acoustic and Linguistic Cues. Speech Communication, Special Issue: Sensing Emotion and Affect - Facing Realism in Speech Processing. Elsevier Science Publishers B. V..

Möller, Sebastian and Wechsung, Ina and Kühnel, Christine and Polzehl, Tim and Schultz, Tanja and Putze, Felix (2011). Evaluation of Cognitive Interactive Systems: Problem Formulation and First Insights. Invited talk, Workshop on Benchmarking and Evaluation of Interactive Cognitive Systems (BCogS 2011).

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