Doppler-variant Modeling of the Vocal Tract: Stability Considerations

Conference: Sprachkommunikation 2008 - 8. ITG-Fachtagung
10/08/2008 - 10/10/2008 at Aachen, Germany

Proceedings: Sprachkommunikation 2008

Pages: 3Language: englishTyp: PDF

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Heim, Axel (Institute of Telecommunications and Applied Information Theory (TAIT), Ulm University, Germany)
Sorger, Uli (Computer Science and Communications (CSC), University of Luxembourg, Luxembourg)

A common technique to deploy linear prediction to nonstationary signals is time segmentation and local analysis. In [A. Heim, U. Sorger, and F. Hug], “Doppler-variant modeling of the vocal tract”, the temporal changes of linear prediction coefficients (LPCs) are modeled as a Fourier series. This allows analysis and optimization of larger speech segments, i.e., virtually global analysis. Possibly resulting non-minimum-phase prediction error polynomials are subject to all-pass filtering. We show that introducing the stabilizing filter does not deteriorate the overall predictor performance.