Dr. Alexander Raake

Research Field:

• Usability

Research Topics:

• VoIP-based speech transmission systems
• Virtual communication environments for multi-party conferencing
• Multi-modal communication systems
• Audio-visual Quality of IPTV and VoD

Disclaimer

The content of and any views expressed in this personal page are those of the person named only and are not those of the TU-Berlin, the Deutsche Telekom AG or the Deutsche Telekom Laboratories. The official Web page of the Deutsche Telekom Laboratories can be found here.

Biography

Alexander Raake joined the Labs in 2005 as a senior scientist. From 2004 to 2005, he was a Postdoctoral Researcher in the Man-Machine Communication Department of the LIMSI-CNRS in Orsay, France, working on speech intelligibility in multi-party virtual chat-rooms. From the Electrical Engineering and Information Technology Faculty of the Ruhr-University Bochum, he obtained his Doctoral Degree (Dr.-Ing.) in January 2005, as a result of his work as a research scientist at the Institute of Communication Acoustics (Jens Blauert). During his thesis work from 1999 to 2004, he studied the auditory quality of future user-interfaces, and quality under impairments due to packet-based transmission such as VoIP. He also investigated the perceived quality of enhanced services such as wideband speech transmission. After his graduation in 1997 he had first started a research activity at the Technical University in Lausanne (EPFL), studying properties of ferroelectric thin films. Before, he studied Electrical Engineering in Aachen (RWTH) and Paris (ENST/Télécom), involving student research at Symetrix Cooperation in Colorado-Springs, USA.

Since 1999, he participates in the standardisation activities of the International Telecommunication Union (ITU-T) on transmission performance of telephone networks and terminals, where he currently acts as a Co-Rapporteur for question Q.12/12, and as an Editor of Recommendations such as ITU-T Rec. G.107 (the "E-model").

Publications

2006

• Raake, A.
  Speech Quality of VoIP: Assessment and Prediction
  John Wiley & Sons, UK-Chichester. (web site, .html)
  
• Raake, A.
  Short- and Long-term Packet Loss Behavior: Towards Speech Quality Prediction for Arbitrary Loss Distributions
  IEEE Trans. Audio, Speech and Language Proc., 14(6), 1957-1968. (abstract, .html)
• Möller, S., Raake, A., Kitawaki, N., Takahashi, A., and Wältermann, M.
  Impairment Factor Framework for Wideband Speech Codecs
  IEEE Trans. Audio, Speech and Language Proc., 14(6), 1969-1976. (abstract, .html)
• Raake, A., and Katz, B.
  Measurement and Prediction of Speech Intelligibility in a Virtual Chat Room
  In: Proc. 2nd ISCA/DEGA Tutorial and Research Workshop on Perceptual Quality of Systems, 4-6 September 2006, D-Berlin, 40-43. (abstract, .html)
• Raake, A., and Katz, B.
  SUS-based Method for Speech Reception Threshold Measurement in French
  In: Proc. 5th International Conference on Language Resources and Evaluation (LREC 2006), IT-Genoa, 2028-2033. (abstract, .html)
• Mareüil, P., D'Alessandro, C., Raake, A., Bailly, G., Garcia, M., and Morel, M.
  A Joint Intelligibility Evaluation of French Text-to-speech Synthesis Systems: The EvaSy SUS/ACR Campaign
  In: Proc. 5th International Conference on Language Resources and Evaluation (LREC 2006), IT-Genoa, 2034-2037. (abstract, .html)
• Wältermann, M., Raake, A., and Möller, S.
  Perceptual Dimensions of Wideband-transmitted Speech
  In: Proc. 2nd ISCA/DEGA Tutorial and Research Workshop on Perceptual Quality of Systems, 4-6 September 2006, D-Berlin, 103-108.
• Côté, N., Möller, S., Gautier-Turbin, V., and Raake, A.
  Analysis of a Quality Prediction Model for Wideband Speech Quality, the WB-PESQ
  In: Proc. 2nd ISCA/DEGA Tutorial and Research Workshop on Perceptual Quality of Systems, DE-Berlin, 115-122.
• Möller, S., Englert, R., Engelbrecht, K., Hafner, V., Jameson, A., Oulasvirta, A., Raake, A., and Reithinger, N.
  MeMo: Towards Automatic Usability Evaluation of Spoken Dialogue Services by User Error Simulations
  In: Proc. 9th Int. Conf. on Spoken Language Processing (Interspeech 2006 - ICSLP), US-Pittsburgh PA, 1786-1789.
• Scholz, K., Wältermann, M., Huo, L., Raake, A., Möller, S., and Heute, U.
  Estimation of the Quality Dimension 'Directness/Frequency Content' for the Instrumental Assessment of Speech Quality
  In: Proc. 9th International Conference on Spoken Language Processing (ICSLP 2006), USA-Pittsburgh, PA, 1523-1526.
• Wältermann, M., Scholz, K., Raake, A., Heute, U., and Möller, S.
  Underlying Quality Dimensions of Modern Telephone Connections
  In: Proc. 9th International Conference on Spoken Language Processing (ICSLP 2006), USA-Pittsburgh, PA, 2170-2173.
• ITU-T Delayed Contribution D.151
  Towards a Wideband E-Model: R-Scale Extension and Impairment Factors for Wideband Speech Codecs
  Federal Republic of Germany and Japan (Authors: S. Möller, A. Raake, N. Kitawaki, A. Takahashi, M. Wältermann), ITU-T SG12 Meeting, 5-13 June 2006, CH-Geneva.
• Raake, A., and Katz, B.
  A Method for Measuring the Speech Reception Threshold in Different Languages
  32. Jahrestagung für Akustik, DE-Braunschweig, 20.-23. März 2006, Deutsche Gesellschaft für Akustik e.V. (DEGA), D-Berlin.
• Scholz, K., Wältermann, M., Huo, L., Raake, A., Möller, S., and Heute, U.
  Vergleich der instrumentellen Erfassung der Qualitätsdimension 'Direktheit/Frequenzgehalt' bei Schmalband- und Breitbandsprache
  In: Proc. 7. ITG-Fachtagung Sprachkommunikation, D-Kiel, 26.-28. April 2006, VDE Verlag, D-Berlin.
• Wältermann, M., Scholz, K., Raake, A., Heute, U., and Möller, S.
  Qualitätsdimensionen bei der Sprachübertragung in modernen Telekommunikationsnetzen
  In: Fortschritte der Akustik (DAGA '06), 32. Jahrestagung für Akustik, DE-Braunschweig, 20.-23. März 2006, Deutsche Gesellschaft für Akustik e.V. (DEGA), D-Berlin, 457-458.
• Scholz, K., Wältermann, M., Huo, L., Raake, A., Möller, S., and Heute, U.
  Messtechnische Erfassung der Qualitätsdimension 'Direktheit/Frequenzgehalt' zur instrumentellen Analyse und Beurteilung von Sprachqualität.
  In: Fortschritte der Akustik (DAGA '06), 32. Jahrestagung für Akustik, DE-Braunschweig, 20.-23. März 2006, Deutsche Gesellschaft für Akustik e.V. (DEGA), D-Berlin, 459-460.

2005

• Raake, A., and Möller, S.
  Quality Degradation Due to Linear and Non-linear Distortion of Wideband Speech
  In: Proc. 4th EAA Convention (Forum Acusticum 2005), HU-Budapest, 29 Aug.-2 Sept. 2005.
• ITU-T Delayed Contribution D.029
  Preliminary Equipment Impairment Factors for Wideband Speech Codecs
  Federal Republic of Germany (Authors: S. Möller and A. Raake), ITU-T SG12 Meeting, 18-27 January 2005, CH-Geneva.
• ITU-T Delayed Contribution D.028
  How Much Better Can Wideband Telephony Be? Estimating the Necessary R-scale Extension
  Federal Republic of Germany (Author: A. Raake), ITU-T SG 12 Meeting, 18-27 January 2005, CH-Geneva.
• ITU-T Delayed Contribution D.027
  General Prediction of the Impairment due to Dependent (Non-Random) Packet Loss for Inclusion in the E-Model
  Federal Republic of Germany (Author: A. Raake), ITU-T SG 12 Meeting, 18-27 January 2005, CH-Geneva.
• ITU-T Temporary Document TD.024-GEN
  Draft Revised Recommendation G.107
  Author: A. Raake, ITU-T SG 12 Meeting, 18-27 January 2005, CH-Geneva.
• Hammer, F., Reichl, P., and Raake, A.
  The Well-Tempered Conversation: Interactivity, Delay and Perceptual VoIP Quality
  In: Proc. IEEE International Conference on Communications (ICC 2005), May 2005, KR-Seoul.
• Möller, S., Raake, A.
  Quantifying the Quality Difference Between Narrow-Band and Wideband Speech Codecs
  In: Fortschritte der Akustik – DAGA 2005: Plenarvortr. u. Fachbeitr. d. 31. Dtsch. Jahrestg. f. Akust., DE-München, Dtsch. Ges. Akust., DE-Oldenburg.

2004

• Raake, A.
  Assessment and Parametric Modelling of Speech Quality in Voice-over-IP Networks
  Doctoral Dissertation, Ruhr-University Bochum, Germany.
• Raake, A.
  Predicting Speech Quality under Random Packet Loss: Individual Impairment and Additivity with other Network Impairments
  Acta Acustica united with Acustica, 90(6), 1061-1083.
• Raake, A.
  How Much Better Can Wideband Telephony Be? Estimating the Necessary R-scale Extension
  Presented at: ETSI Workshop on Wideband Speech Quality in Terminals and Networks: Assessment and Prediction, June 8-9, DE-Mainz, European Telecommunications Standards Institute, FR-Sophia Antipolis.
• Raake, A.
  Predicting Speech Quality under Packet Loss: Extension of the E-model
  In: Proc. 7. Congrès Français d'Acoustique / 30. Dtsch. Jahrestg. f. Akust. (CFA/DAGA'04), FR-Strassburg, 51-52.
• Raake, A.
  How do Users Perceive Speech Quality under Combined Stationary and Non-stationary Degradations?
  In: Proc. 7. Congrès Français d'Acoustique / 30. Dtsch. Jahrestg. f. Akust. (CFA/DAGA'04), FR-Strassburg, 265-266.
• ITU-T Delayed Contribution D.222.
  Speech Transmission Quality under 2-state Markov Loss and Implications for the E-model
  Federal Republic of Germany (Author: A. Raake), ITU T SG 12 Meeting, 24-31 March 2004, CH-Geneva.
• ITU-T Delayed Contribution D.221.
  E-Model: Additivity of Burst Packet Loss Impairment with other Impairment Types
  Federal Republic of Germany (Author: A. Raake), ITU-T SG 12 Meeting, 24-31 March 2004, CH-Geneva.
• Hammer, F., Reichl, P., Raake, A.
  Elements of Interactivity in Telephone Conversations
  In: Proc. 8th Int. Conf. on Spoken Language Processing (Interspeech 2004 - ICSLP), KR-Jeju Island, 1741-1744.
• Krebber, J., Möller, S., Raake, A.
  Speech Input and Output Module Assessment for Remote Access to a Smart-Home Spoken Dialog System
  In: Proc. 8th Int. Conf. on Spoken Language Processing (Interspeech 2004 - ICSLP), KR-Jeju Island, 2753-2756.
• Möller, S., Raake, A., Barriac, V., Quinquis, C.
  Deriving Equipment Impairment Factors for Wideband Speech Codecs
  Presented at: ETSI Workshop on Wideband Speech Quality in Terminals and Networks: Assessment and Prediction, June 8-9, DE-Mainz, European Telecommunications Standards Institute, FR-Sophia Antipolis.
• Krebber, J., Möller, S., Pegam, R., Raake, A., Melichar, M., Rajman, M.
  Wizard of Oz Tests for a Dialogue System for Smart Homes
  In: Proc. 7. Congrès Français d'Acoustique / 30. Dtsch. Jahrestg. f. Akust. (CFA/DAGA'04), FR-Strassburg, 1149-1150.
• Möller, S., Krebber, J., and Raake, A.
  Performance of Speech Recognition and Synthesis in Packet-Based Networks
  In: Proc. 8th Int. Conf. on Spoken Language Processing (Interspeech 2004 - ICSLP), KR-Jeju Island, 1541-1544.
• Möller, S., Krebber, J., and Raake, A.
  Einfluss von Paketverlusten auf die Qualität von Spracherkennung und Sprachsynthese
  In: Elektronische Sprachsignalverarbeitung: Tagungsband der 15. Konferenz, K. Fellbaum (ed.), w.e.b. Universitätsverlag, DE-Dresden, 268-275.
• Möller, S., Krebber, J., Raake, A., Smeele, P., Rajman, M., Melichar, M., Pallotta, V., Tsakou, G., Kladis, B., Vovos, A., Hoonhout, A., Schuchardt, D., Fakotakis, N., Ganchev, T., and Potamitis, I.
  INSPIRE: Evaluation of a Smart-Home System for Infotainment Management and Device Control
  In: Proc. 4th Int. Conf. on Language Resources and Evaluation (LREC 2004), PT-Lisbon, Vol. 5, 1603-1606.

2003

• ITU-T Delayed Contribution D.178
  E-Model: Additivity of Packet Loss Impairment with other Impairment Types
  Federal Republic of Germany (Author: A. Raake), ITU-T SG 12 Meeting, 22-30 Sept. 2003, CH-Geneva.
• ITU-T Delayed Contribution D.179
  E-Model: Average Quality vs. Quality as a Function of Average Packet Loss
  Federal Republic of Germany (Author: A. Raake), ITU-T SG 12 Meeting, 22-30 Sept. 2003, CH-Geneva.
• Raake, A.
  Speech Quality of Heterogeneous Networks Involving VoIP: Are Time-Varying Impairments Additive to Classical Stationary Ones?
  In: Proc. 1st ISCA Tutorial and Research Workshop on Auditory Quality of Systems, DE-Herne, 63-70.
• Raake, A.
  Time Varying Distortions and Traditional Telephony: Speech Quality under Combined Network Distortions
  In: Fortschritte der Akustik - DAGA 2003: Plenarvortr. u. Fachbeitr. d. 29. Dtsch. Jahrestg. f. Akust., DE-Aachen, Dtsch. Ges. Akust., DE-Oldenburg.
• Krebber, J., Raake, A., and Möller, S.
  Modellierung der Einflüsse des Übertragungskanals bei der Interaktion mit einem Smart-Home-System
  In: Fortschritte der Akustik - DAGA 2003: Plenarvortr. u. Fachbeitr. d. 29. Dtsch. Jahrestg. f. Akust., DE-Aachen, Dtsch. Ges. Akust., DE-Oldenburg, 732-733.

2002

• Raake, A.
  Does the Content of Speech Influence its Perceived Sound Quality?
  In: Proc. 3rd Int. Conf. on Language Resources and Evaluation (LREC 2002), ES-Las Palmas, Vol. 4, 1170-1176.
• Raake, A.
  Parameter-based Modelling of Speech Quality in Telephone Networks
  In: Fortschr. Akust. DAGA 2002, Dtsch. Ges. Akust., DE-Oldenburg.
• ITU-T Contribution COM 12-38
  Draft Revised Recommendation G.107
  Federal Republic of Germany (Author: A. Raake), ITU-T SG12 Meeting, 27-31 May 2002, CH-Geneva.
• ITU-T Delayed Contribution D.052
  Amendment to SG 12 COM-38 (Revision of G.107)
  Deutsche Telekom AG (Author: A. Raake), ITU-T SG12 Meeting, 27-31 May 2002, CH-Geneva.
• Rehmann, S., Raake, A., and Möller, S.
  Parametric Simulation of Impairments Caused by Telephone and Voice over IP Network TransmissionIn: Proc. 3rd EAA Convention (Forum Acusticum 2002), ES-Sevilla.
• Möller, S., and Raake, A.
  Telephone Speech Quality Prediction: Towards Network Planning and Monitoring Models for Modern Network Scenarios
  Speech Communication, vol. 38, 47-75.
• Krebber, J., Möller, S., Raake, A., Rehmann, S., Berger, J., and Johannsen, W.
  Ein Simulationssystem zur Untersuchung des Einflusses von Übertragungskanälen bei Smart-Home-Anwendungen
  In: Elektronische Sprachsignalverarbeitung: Tagungsband der 13. Konferenz, R. Hoffmann (ed.), w.e.b. Universitätsverlag, DE-Dresden, 75-82.

2001

• Raake, A.
  Der Einfluss von Bedeutung auf die Wahrnehmung des Klangs von Sprache
  In: Fortschr. Akust. DAGA 2001, Dtsch. Ges. Akust., DE-Oldenburg.
• ITU-T Delayed Contribution D.044
  Modelling Impairment due to Packet-Loss for Application in the E-Model
  Deutsche Telekom AG, Germany (Author: A. Raake), ITU-T SG 12 Meeting, 22-26 Oct. 2001, SEN-Dakar.
• ITU-T Delayed Contribution D.012
  Towards Enhancing the E-Model to Include Hands-Free Terminals: Subjective Assessment of Quality in Send-Direction and Additivity with Other Degradations
  Deutsche Telekom AG (Author: A. Raake), ITU-T SG 12 Meeting
, 19-23 Feb. 2001, CH-Geneva.
• ITU-T Delayed Contribution D.011
  The Quality of Bandpass-filtered Speech Assessed with Different Terminal Equipment: Implications for Wide-Band Studies
  Deutsche Telekom AG (Author: A. Raake), ITU-T SG 12 Meeting, 19-23 Feb. 2001, CH-Geneva.

2000

• Raake, A.
  Perceptual Dimensions of Speech Sound Quality in Modern Transmission Systems
  In: Proc. ICSLP 2000, vol. 4, 744-747, CHN-Beijing.
• Möller, S., Jekosch, U., and Raake, A.
  New Models Predicting Conversational Effects of Telephone Transmission on Speech Communication Quality
  In: Proc. ICSLP 2000, vol. 2, 190-193, CHN-Beijing.
• Möller, S., Raake, A.
  Planung von Telefon-Sprachqualität: Unterschiedliche Modellansätze
  In: Fortschr. Akust. DAGA 2000, 208-209, Dtsch. Ges. Akust., DE-Oldenburg.

1999

• Colla, E.L., Raake, A., Taylor, D.V., Setter, N.
  Exploring Polarisation Switching and Imprint in Fatigued Pt-PZT-Pt FECAPs by Atomic Force Microscopy
  Integrated Ferroelectrics 27, 1-4, 1215-1222.

Talks and Presentations

• Raake, A. (2006). Assessment and control of speech intelligibility in virtual chat rooms. Kolloquium zur Akustik, Medizinischen Physik und Signalverarbeitung, Oldenburg, June 20, 2006.
• Raake, A. (2004). Models for Speech Quality Prediction in Telecommunications. Keynote lecture ftw. Member Tutorial “Improving the User Experience: Methods, Perspectives, and Case Studies”, Jan. 22nd, Telecommunications Research Center Vienna (ftw.), A-Vienna.
• Raake, A. (2004). Assessment and Prediction of Speech Quality under Packet Loss. Presented in the framework of the Telecommunications Forum, Jan. 23rd, Telecommunications Research Center Vienna (ftw.), A-Vienna.
• Raake, A. (2002). Assessment and Prediction of Speech Quality under Time-Varying Distortions. NATO Advanced Study Institute (ASI) on the Dynamics of Speech Production and Perception, 24 June - 6 July 2002, I-Il Ciocco.
• Jekosch, U., Möller, S., Raake, A. (2001). Extensions of the E-Model, ITU-T SG12 Workshop on QoS and User-Perceived Transmission Quality in Evolving Networks, 18-19 Oct. 2001, SEN-Dakar.

Professional Activities

• Co-Organizer: Workshop on Perceptual Quality of Systems (PQS 2006), Sept. 4-6, 2006, Harnack-Haus, Berlin, Germany
• Co-Organizer: Structured Session on "Sprache & Audio in intelligenten Umgebungen", March 19-22, 2007, at 33rd "Jahrestagung für Akustik (DAGA 07)", Deutsche Gesellschaft für Akustik e.V. (DEGA)
, DE-Stuttgart
• Co-Organizer: Structured Session on "Qualitätsaspekte sprachlicher Kommunikation", March 20-23, 2006, at 32nd "Jahrestagung für Akustik (DAGA 06)", Deutsche Gesellschaft für Akustik e.V. (DEGA)
, DE-Braunschweig
• Co-Organizer: Structured Session on "Wideband Speech Quality", March 14-17, 2005, at 31st "Jahrestagung für Akustik (DA 05)", Deutsche Gesellschaft für Akustik e.V. (DEGA)
, DE-Munich
• Co-Organizer: Structured Session on "Temporal Aspects in the Perception of Sound and Speech Quality", March 22-25, 2004, at "Joint Conference - 7ème Congrès Français d’Acoustique/ 30th Jahrestagung für Akustik (CFA/DAGA 04)", Société Française d Acoustique (SFA), Deutsche Gesellschaft für Akustik e.V. (DEGA)
, F-Strasbourg
• Co-Organizer: Structured Session on "Recent Advances in Speech Quality Modelling", March 22-25, 2004, at "Joint Conference - 7ème Congrès Français d’Acoustique/ 30th Jahrestagung für Akustik (CFA/DAGA 04)", Société Française d Acoustique (SFA), Deutsche Gesellschaft für Akustik e.V. (DEGA)
, F-Strasbourg
• Co-Organizer: Structured Session on "Sprachakustik für Sprachdialogsysteme", March 18-20, 2003, at 29th "Jahrestagung für Akustik (DAGA 05)", Deutsche Gesellschaft für Akustik e.V. (DEGA)
, DE-Aachen
• Co-Organizer: Structured Session on "Monitoring Speech Quality in Telephone Networks", March 5, 2002, at 28th "Jahrestagung für Akustik (DAGA 02)", Deutsche Gesellschaft für Akustik e.V. (DEGA)
, DE-Oldenburg

Teaching

• Studienprojekt (study project) “Röhrenmodell des Sprachtraktes“ (Tube Model of the Vocal Tract), Ruhr-University Bochum, 2003-2004
• Several Diplom / Master thesis supervisions (Germany and France)

Contributions to Teaching

• Seminar “Virtual and Augmented Reality”, Technical University Berlin, 2006 (with G. Essl, M. Rohs, and S. Spors)
• Course “Kommunikationsakustik II: Audiokommunikation und Virtuelle Realität” (Communication Acoustics II: Audio Communication and Virtual Reality), Ruhr-University Bochum, 2002-2003
• Seminar “Statistische Methoden der Spracherkennung” (Statistical Methods in Speech Recognition), Ruhr-University Bochum, 2002-2005
• Seminar “Statistische Methoden in der Psychoakustik und Sprachkommunikation” (Statistical Methods in Psychoacoustics and Speech Communication), Ruhr-University Bochum, 2001
• Praktikum “Kommunikationsakustik” (Communication Acoustics), Ruhr-University Bochum, 2001-2003
• Exercises “Grundlagen der Elektrotechnik” (Fundamentals of Electrical Engineering“), Ruhr-University Bochum, 1999-2003
• Exercises to: “Kommunikationsakustik I: Technische Grundlagen” (Communication Acoustics I: Technical Bases), Ruhr-University Bochum, 1999-2003
• Exercises to: “Kommunikationsakustik II: Audiokommunikation und Virtuelle Realität” (Communication Acoustics II: Audio Communication and Virtual Reality), Ruhr-University Bochum, 1999-2003
• Exercises to: “Kommunikationsakustik IV: Kommunikationsqualität in der Sprachtechnologie” (Communication Acoustics IV: Communication Quality in Speech Technology), Ruhr-University Bochum, 2001-2004

Address

Deutsche Telekom AG
Laboratories
Ernst-Reuter-Platz 7
10587 Berlin

Email: