Bandwidth Expansion of Narrowband Speech Using Non-Negative Matrix Factorization

    •  Bansal, D., Raj, B., Smaragdis, P., "Bandwidth Expansion of Narrowband Speech Using non-Negative Matrix Factorization", Eurospeech, September 2005.
      BibTeX TR2005-135 PDF
      • @inproceedings{Bansal2005sep,
      • author = {Bansal, D. and Raj, B. and Smaragdis, P.},
      • title = {Bandwidth Expansion of Narrowband Speech Using non-Negative Matrix Factorization},
      • booktitle = {Eurospeech},
      • year = 2005,
      • month = sep,
      • url = {}
      • }
  • Research Area:

    Speech & Audio


In this paper, we present a novel technique for the estimation of the high frequency components (4-8kHz) of speech signals from narrow-band (0-4 kHz) signals using convolutive Non-Negative Matrix Factorisation (NMF). The proposed technique utilizes a brief recording of simultaneous broad band and narrow band signals from a target speaker to learn a set of broad-band non-negative bases for the speaker. The low-frequency components of these bases are used to determine how the high-frequency components must be combined in order to reconstruct the high-frequency components of new narrow-band signals from the speaker. Experiments reveal that the technique is able to reconstruct broadband sppech that is perceptually virtually indistinguishable from true broadband recordings.


  • Related News & Events

    •  NEWS    Eurospeech 2005: 2 publications by MERL researchers and others
      Date: September 4, 2005
      Where: Eurospeech
      • The papers "Bandwidth Expansion of Narrowband Speech Using non-Negative Matrix Factorization" by Bansal, D., Raj, B. and Smaragdis, P. and "Recognizing Speech from Simultaneous Speakers" by Raj, B., Singh, R. and Smaragdis, P. were presented at Eurospeech.