Hidden Markov model-based speech synthesis is prone to over-smoothing of spectral parameter trajectories. The maximum-likelihood parameter generation favors smooth tracks and the utterance-level variance of each parameter trajectory is significantly reduced compared to the original recordings. This results in muffled speech. To retain the natural variance, statistical global variance modeling h...

We study finite-state controllers (FSCs) for partially observable Markov decision processes (POMDPs). The key insight is that computing (randomized) FSCs on POMDPs is equivalent to synthesis for parametric Markov chains (pMCs). This correspondence enables using parameter synthesis techniques to compute FSCs for POMDPs in a black-box fashion. We investigate how typical restrictions on parameter ...

We present a simple, yet flexible parameter synthesis approach for Cyber-Physical Systems (CPS). The user defines the behavior of a CPS, a set of (un)safe states, and a generic template for an invariant using Satisfiability Modulo Theories (SMT) formulas. Counterexample-Guided Inductive Synthesis (CEGIS) is then used to compute values for open parameters and a concrete invariant to prove that a...

We describe a parameter synthesis algorithm for planar mechanical systems comprised of higher kinematic pairs in which each part translates along a fixed axis or rotates around a fixed point. This is an important class of systems and is not addressed by prior synthesis research. Kinematic function is computed from the CAD models of the parts and is represented graphically as configuration space...

Interval Markov Chains (IMCs) are the base of a classic probabilistic specification theory introduced by Larsen and Jonsson in 1991. They are also a popular abstraction for probabilistic systems. In this paper we study parameter synthesis for a parametric extension of Interval Markov Chains in which the endpoints of intervals may be replaced with parameters. In particular, we propose constructi...

We describe a parameter synthesis algorithm for planar mechanical systems comprised of higher kinematic pairs in which each part translates along a fixed axis or rotates around a fixed point. This is an important class of systems and is not addressed by prior synthesis research. Kinematic function is computed from the CAD models of the parts and is represented graphically as configuration space...