Time Line of the Lecture "Pattern Recognition"

  • Basics of speaker verification und speaker identification
    • Preprocessing and segmentation
    • Codebook-based schemes
    • Schemes based on Gaussian mixture models
    • Model adaption
    • Discriminative approaches
  • Fundamentals of speech recognition
    • Speech recognition and understanding
    • Applications and system variants
    • Evaluation
  • Statistical speech recognition
    • Maximum a-posteriori (MAP) rule
    • Model simplification
    • Modeling
  • Conclusion and outlook

Slides of the lecture

  • Motivation
  • Fundamentals
    • The „hidden“ part of the model
    • The inner family of random processes
  • Fundamental problems of Hidden Markov Models
    • Efficient calculation of sequence probabilities
    • Efficient calculation of the most probable sequence

Slides of the lecture

  • Motivation
  • Fundamentals
    • Gaussian mixture models in practice
    • Generation of Gaussian mixture models
  • Applications in speech and audio processing
    • Bandwidth extension
    • Signal separation
    • Speaker recognition

Slides of the lecture

  • Motivation
  • System concept
  • Extension of the excitation signal
    • Spectral shifting and modulation
    • Non-linear characteristics
  • Extension of the spectral envelope
    • Approaches using neural networks
    • Codebook-based approaches
    • Linear mapping
  • Examples

Slides of the lecture

  • Motivation
  • Application examples
  • Cost function for the training of a codebook
  • LBG- and k-means algorithm
    • Basic schemes
    • Extensions
  • Combination with additional mapping schemes

Slides of the lecture

  • Introduction
  • Features for speech and speaker recognition
    • Fundamental frequency
    • Spectral envelope
  • Representation of the spectral envelope
    • Predictor coefficients
    • Cepstral coefficients
    • Mel-filtered cepstral coefficients

Slides of the lecture

  • Introduction
  • Characteristic of multi-microphone systems
  • Delay-and-sum structures
  • Filter-and-sum structures
  • Interference compensation
  • Audio examples and results
  • Outlook on postfilter structures

Slides of the lecture

Website News

01.10.2018: Dissertation of Philipp Bullding added.

14.08.2018: New section about our SONAR "sisters" added.

18.07.2018: New section about our Parkinson voice training game added.

07.07.2018: New lecture Fundamentals of Acoustics by Jan Abshagen added.

03.03.2018: Team wall added.

Recent Publications

E. Elzenheimer, H. Laufs, T. Sander-Thömmes, G. Schmidt: Magnetoneurograhy of an Electrically Stimulated Arm Nerve, Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering and the German Society of Biomaterials, Volume 63, Number 12, Pages 363-366, September 2018

Contact

Prof. Dr.-Ing. Gerhard Schmidt

E-Mail: gus@tf.uni-kiel.de

Christian-Albrechts-Universität zu Kiel
Faculty of Engineering
Institute for Electrical Engineering and Information Engineering
Digital Signal Processing and System Theory

Kaiserstr. 2
24143 Kiel, Germany

Recent News

Audiometer

Last Wednesday (17.10.2018) we obtained our first audiometer. With this audiometer we are able to conduct both pure-tone audiometry up to 12.5 kHz and basic speech intelligibility tests. The tests may be perfomed for either air/bone conduction or in the free field. Now we can analyze the hearing capabilities of our test subjects, which will help us when performing subjective tests. Special ...


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