A parametric approach to vocal tract length normalization

  • Authors:
  • E. Eide;H. Gish

  • Affiliations:
  • BBN Syst. & Technol. Corp., Cambridge, MA, USA;BBN Syst. & Technol. Corp., Cambridge, MA, USA

  • Venue:
  • ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 01
  • Year:
  • 1996

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Abstract

Differences in vocal tract size among individual speakers contribute to the variability of speech waveforms. The first-order effect of a difference in vocal tract length is a scaling of the frequency axis; a female speaker, for example, exhibits formants roughly 20% higher than the formants of from a male speaker, with the differences most severe in open vocal tract configurations. We describe a parametric method of normalisation which counteracts the effect of varied vocal tract length. The method is shown to be effective across a wide range of recognition systems and paradigms, but is particularly helpful in the case of a small amount of training data.