EAN: 9783031014352

SYNTHESIS LECTURES ON SPEECH AND AUDIO PROCESSI...

This book addresses the problem of articulatory speech synthesis based on computed vocal tract
geometries and the basic physics of sound production in it. Unlike conventional methods based
on analysis synthesis using the well-known source filter model  which assumes the independence
of the excitation and filter  we treat the entire vocal apparatus as one mechanical system that
produces sound by means of fluid dynamics. The vocal apparatus is represented as a
three-dimensional time-varying mechanism and the sound propagation inside it is due to the
non-planar propagation of acoustic waves through a viscous  compressible fluid described by the
Navier-Stokes equations. We propose a combined minimum energy and minimum jerk criterion to
compute the dynamics of the vocal tract during articulation. Theoretical error bounds and
experimental results show that this method obtains a close match to the phonetic target
positions while avoiding abrupt changes in the articulatory trajectory. The vocal folds are set
into aerodynamic oscillation by the flow of air from the lungs. The modulated air stream then
excites the moving vocal tract. This method shows strong evidence for source-filter
interaction. Based on our results  we propose that the articulatory speech production model has
the potential to synthesize speech and provide a compact parameterization of the speech signal
that can be useful in a wide variety of speech signal processing problems. Table of Contents:
Introduction   Literature Review   Estimation of Dynamic Articulatory Parameters   Construction
of Articulatory Model Based on MRI Data   Vocal Fold Excitation Models   Experimental Results
of Articulatory Synthesis   Conclusion

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