Determination of a Vocal Source by the Spectral Ratio Methodстатья
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Дата последнего поиска статьи во внешних источниках: 21 августа 2017 г.
Аннотация:The inverse problem with respect to functions proportional to a voice source and volume velocity
of the air flow through the glottis is solved as follows: we compute the inverse Fourier transform of the regularized
fraction of short-term speech-signal spectra at intervals with an opened (closed) glottis, minimizing
the optimality criterion with respect to the regularization parameter and the glottis opening (closing) time.
The optimality criterion for solutions includes the values of the volume velocity and its time derivative at the
ends of the interval with an opened glottis and the total value of the negative volume velocity. To obtain an
empirical error estimate for the solution, experiments using synthesized signals with various parameters,
direct measurements of the glottis, and signals synchronously recorded through pairs of microphones of different
types are performed. The most probable determination error for the volume velocity is less than 5% for
synthetic sources; if the area of the glottis of the source is measured experimentally, then the said error is
about 10%. The discrepancy of solutions for the same signal synchronously recorded through a pair of microphones
of different types is less than 10%.