Dr.-Ing. Bernd Geiser

Scientist

Room: 303
+49 241 80-26979
+49 241 80-22254
geiser(at)iks.rwth-aachen.de

Research

  • Bandwidth Extension of Speech and Audio Signals
  • Hierarchical Speech and Audio Coding (e.g. ITU-T Rec. G.729.1)
  • Backwards Compatible Wideband Telephony
  • Steganography for speech codecs and new applications

Teaching

  • Laboratory "Information and Communication Technology", Experiment 1
  • Seminar "Selected Topics in Communications Engineering"

Student Theses

Normally, the topics of student theses are directly related to current resarch work. In some cases, a concrete task description is not yet available. Students, who are interested in my work, should in any case contact me for the most recent topics.

Open Theses

No items available.

Theses in Progress

No items available.

Publications

Publications from Sep/ 2014 to Mar/ 2010

Geiser, B., Krüger, H., Vary, P. and Wiese, D.: A Differential Microphone Array with Input Level Alignment, Directional Equalization and Fast Notch Adaptation for Handsfree Communication, in ITG-Fachtagung Sprachkommunikation Sep/2014


Krüger, H., Geiser, B. and Vary, P.: On Reverse Waterfilling in Closed-Loop LPC with Noise Shaping, in ITG-Fachtagung Sprachkommunikation Sep/2014


Krüger, H., Geiser, B. and Vary, P.: On Noise Propagation in Closed-Loop Linear Predictive Coding, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) , p.p. 3718-3722 May/2014


Geiser, B. and Vary, P.: Artificial Bandwidth Extension of Wideband Speech by Pitch-Scaling of Higher Frequencies, in Workshop Audiosignal- und Sprachverarbeitung (WASP) , 220 , p.p. 2892-2901 Sep/2013, ISBN: 978-3-88579-614-5


Gómez, A. M., Pérez-Córdoba, J. L. and Geiser, B.: Backwards-Compatible Error Propagation Recovery for the AMR Codec over Erasure Channels, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) May/2013


Geiser, B. and Vary, P.: Speech Bandwidth Extension Based on In-Band Transmission of Higher Frequencies, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) May/2013


López-Oller, D., Gómez, A. M., Pérez-Córdoba, J. L., Geiser, B. and Vary, P.: Steganographic Pulse-Based Recovery for Robust ACELP Transmission over Erasure Channels, in Proceedings of IberSPEECH , p.p. 257-266 Nov/2012, 10.1007/978-3-642-35292-8_27


Geiser, B.: Paths toward HD-Voice Communication, in Proceedings of International Workshop on Acoustic Signal Enhancement (IWAENC) Sep/2012


Geiser, B.: High-Definition Telephony over Heterogeneous Networks, Ph. D. Dissertation , IND, RWTH Aachen , Aachener Beiträge zu Digitalen Nachrichtensystemen (ABDN) 33 , ISBN: 978-3-86130-339-8 Jun/2012, ISBN: 978-3-86130-339-8


Heese, F., Geiser, B. and Vary, P.: Intelligibility Assessment of a System for Artifical Bandwidth Extension of Telephone Speech, in Proceedings of German Annual Conference on Acoustics (DAGA) , p.p. 905-906 Mar/2012


Geiser, B., Schäfer, M. and Vary, P.: Binaural Wideband Telephony Using Steganography, in Konferenz Elektronische Sprachsignalverarbeitung (ESSV) , 61 , p.p. 132-137 , (Aachen, Germany) , TuDPress Verlag der Wissenschaften GmbH, Sep/2011, ISBN: 978-3-94271-037-4


Schäfer, M., Schnelling, C., Geiser, B. and Vary, P.: A Listening Test Environment for Subjective Assessment of Speech and Audio Signal Processing Algorithms, in Konferenz Elektronische Sprachsignalverarbeitung (ESSV) , 61 , p.p. 237-244 , (Aachen, Germany) , TUDpress Verlag der Wissenschaften GmbH, Sep/2011, ISBN: 978-3-94271-037-4


Krüger, H., Geiser, B., Vary, P., Li, H. T. and Zhang, D.: A Fast Indexing Method for Shells of the Gosset Lattice, in Konferenz Elektronische Sprachsignalverarbeitung (ESSV) , 61 , p.p. 205-212 , TuDPress Verlag der Wissenschaften GmbH, Sep/2011, ISBN: 978-3-94271-037-4


Krüger, H., Geiser, B., Vary, P., Li, H. T. and Zhang, D.: Gosset Lattice Spherical Vector Quantization with Low Complexity, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) , p.p. 485-488 , (Prague, Czech Republic) May/2011, ISBN: 978-1-45770-539-7, 10.1109/ICASSP.2011.5946446


Krüger, H., Geiser, B. and Vary, P.: Gosset Low Complexity Vector Quantization with Application to Audio Coding, in ITG-Fachtagung Sprachkommunikation , (Bochum, Germany) , VDE Verlag GmbH, Oct/2010, ISBN: 978-3-80073-300-2


Heese, F., Esch, T., Geiser, B. and Vary, P.: Noise Reduction for Wideband Speech Exploiting Spectral Dependencies Based on Conditional Estimation, in ITG-Fachtagung Sprachkommunikation , (Bochum, Germany) , VDE Verlag GmbH, Oct/2010, ISBN: 978-3-80073-300-2


Geiser, B., Roggendorf, M. and Vary, P.: Multi-Band Pre-Echo Control Using a Filterbank Equalizer, in Proceedings of European Signal Processing Conference (EUSIPCO) , p.p. 244-248 , (Aalborg, Denmark) Aug/2010


Esch, T., Heese, F., Geiser, B. and Vary, P.: Wideband Noise Suppression Supported by Artificial Bandwidth Extension Techniques, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) , p.p. 4790-4793 , (Dallas, TX, USA) Mar/2010


Thomas, M. R. P., Geiser, B., Gudnason, J., Naylor, P. A. and Vary, P.: Voice Source Estimation for Artificial Bandwidth Extension of Telephone Speech, in Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) , p.p. 4794-4797 , (Dallas, TX, USA) Mar/2010


Geiser, B., Krüger, H. and Vary, P.: Super-Wideband Bandwidth Extension for Wideband Audio Codecs Using Switched Spectral Replication and Pitch Synthesis, in Proceedings of German Annual Conference on Acoustics (DAGA) , p.p. 663-664 , (Berlin, Germany) Mar/2010


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