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This paper investigates the problem of boot-strapping a statistical dialogue manager without access to training data and proposes a new probabilistic agenda-based method for simulating user behaviour. In experiments with a statistical POMDP dialogue system, the simu-lator was realistic enough to successfully test the prototype system and train a dialogue(More)
Voice morphing is a technique for modifying a source speaker's speech to sound as if it was spoken by some designated target speaker. Most of the recent approaches to voice morphing apply a linear transformation to the spectral envelope and pitch scaling to modify the prosody. Whilst these methods are effective, they also introduce artifacts arising from(More)
Partially observable Markov decision processes (POMDPs) provide a principled mathematical framework for modelling the uncertainty inherent in spoken dialog systems. However, conventional POMDPs scale poorly with the size of state and observation space. This paper describes a variation of the classic POMDP called the Hidden Information State (HIS) model in(More)
Voice conversion is a technique for modifying a source speaker's speech to sound as if it was spoken by a target speaker. A popular approach to voice conversion is to apply a linear transformation to the spectral envelope. However, conventional parameter estimation based on least square error optimization does not necessarily lead to the best perceptual(More)
— Voice morphing is a technique for modifying a source speaker's speech to sound as if it was spoken by some designated target speaker. The core process in a voice morphing system is the transformation of the spectral envelope of the source speaker to match that of the target speaker and linear transformations estimated from time-aligned parallel training(More)
During the electrical stimulation of a uniform, long, and straight nerve axon, the electric field oriented parallel to the axon has been widely accepted as the major field component that activates the axon. Recent experimental evidence has shown that the electric field oriented transverse to the axon is also sufficient to activate the axon, by inducing a(More)
The Android system is getting more and more popular on the mobile devices. Thus, lots of apps have sprung up to facilitate people's daily life. However, many of the apps are released without sufficient testing work, so the users encounter a sudden app crash now and then. This will undoubtedly impact the user's experience and even lead to economic loss.(More)
The Hidden Information State (HIS) Dialogue System is the first trainable and scalable implementation of a spoken dialog system based on the Partially-Observable Markov-Decision-Process (POMDP) model of dialogue. The system responds to n-best output from the speech recogniser, maintains multiple concurrent dialogue state hypotheses, and provides a visual(More)