Theses and Dissertations
This collection includes both ASU Theses and Dissertations, submitted by graduate students, and the Barrett, Honors College theses submitted by undergraduate students.
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- Creators: Turaga, Pavan
Description
Speech is generated by articulators acting on
a phonatory source. Identification of this
phonatory source and articulatory geometry are
individually challenging and ill-posed
problems, called speech separation and
articulatory inversion, respectively.
There exists a trade-off
between decomposition and recovered
articulatory geometry due to multiple
possible mappings between an
articulatory configuration
and the speech produced. However, if measurements
are obtained only from a microphone sensor,
they lack any invasive insight and add
additional challenge to an already difficult
problem.
A joint non-invasive estimation
strategy that couples articulatory and
phonatory knowledge would lead to better
articulatory speech synthesis. In this thesis,
a joint estimation strategy for speech
separation and articulatory geometry recovery
is studied. Unlike previous
periodic/aperiodic decomposition methods that
use stationary speech models within a
frame, the proposed model presents a
non-stationary speech decomposition method.
A parametric glottal source model and an
articulatory vocal tract response are
represented in a dynamic state space formulation.
The unknown parameters of the
speech generation components are estimated
using sequential Monte Carlo methods
under some specific assumptions.
The proposed approach is compared with other
glottal inverse filtering methods,
including iterative adaptive inverse filtering,
state-space inverse filtering, and
the quasi-closed phase method.
a phonatory source. Identification of this
phonatory source and articulatory geometry are
individually challenging and ill-posed
problems, called speech separation and
articulatory inversion, respectively.
There exists a trade-off
between decomposition and recovered
articulatory geometry due to multiple
possible mappings between an
articulatory configuration
and the speech produced. However, if measurements
are obtained only from a microphone sensor,
they lack any invasive insight and add
additional challenge to an already difficult
problem.
A joint non-invasive estimation
strategy that couples articulatory and
phonatory knowledge would lead to better
articulatory speech synthesis. In this thesis,
a joint estimation strategy for speech
separation and articulatory geometry recovery
is studied. Unlike previous
periodic/aperiodic decomposition methods that
use stationary speech models within a
frame, the proposed model presents a
non-stationary speech decomposition method.
A parametric glottal source model and an
articulatory vocal tract response are
represented in a dynamic state space formulation.
The unknown parameters of the
speech generation components are estimated
using sequential Monte Carlo methods
under some specific assumptions.
The proposed approach is compared with other
glottal inverse filtering methods,
including iterative adaptive inverse filtering,
state-space inverse filtering, and
the quasi-closed phase method.
ContributorsVenkataramani, Adarsh Akkshai (Author) / Papandreou-Suppappola, Antonia (Thesis advisor) / Bliss, Daniel W (Committee member) / Turaga, Pavan (Committee member) / Arizona State University (Publisher)
Created2018
Description
This thesis introduces new techniques for clustering distributional data according to their geometric similarities. This work builds upon the optimal transportation (OT) problem that seeks global minimum cost for matching distributional data and leverages the connection between OT and power diagrams to solve different clustering problems. The OT formulation is based on the variational principle to differentiate hard cluster assignments, which was missing in the literature. This thesis shows multiple techniques to regularize and generalize OT to cope with various tasks including clustering, aligning, and interpolating distributional data. It also discusses the connections of the new formulation to other OT and clustering formulations to better understand their gaps and the means to close them. Finally, this thesis demonstrates the advantages of the proposed OT techniques in solving machine learning problems and their downstream applications in computer graphics, computer vision, and image processing.
ContributorsMi, Liang (Author) / Wang, Yalin (Thesis advisor) / Chen, Kewei (Committee member) / Karam, Lina (Committee member) / Li, Baoxin (Committee member) / Turaga, Pavan (Committee member) / Arizona State University (Publisher)
Created2020