Projects

Low-order Models

Continuous/Discrete Dynamics

Baroclinic Flows

Voice morphing

Voice morphing technology with speaker recognition enables a user to transform one person's speech pattern into another person's pattern with distinct characteristics, giving it a new identity, while preserving the original content. This is an area of numerous applications and for this reason it has been the subject of considerable research effort.Some examples of ongoing projects that will benefit from successful voice conversion techniques are:

Text-to-speech (TTS) adaptation including voice individuality disguise for secure communications and voice individuality restoral for interpreting telephony.
Broadcasting, especially movie dubbing.
Voice Editing (looping).
Karaoke applications.
Internet voice applications including screen readers for the blind.
Computer and video games applications.
Low-bandwidth speech encoding.
Aids for hearing impaired persons.

Links

Haskins Laboratory, Yale University, USA
Speech and Language Processing Laboratory, CAIP, Rutgers State University of New Jersey, USA
TISEAN Nonlinear Time Series Analysis Package, Max Planck Institute for the Physics of Complex Systems, Germany
Computational Mechanics Group, Santa Fe Institute, USA

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Low-order models of the Martian atmosphere and simplified models of the QBO

The aim of this project is to generate reduced-order models suitable to study the long-term behaviour of the Martian atmospheric dynamics. At the moment we are investigating the possibilities of Proper Orthogonal Decomposition and related techniques.
The Martian atmosphere is an interesting case since despite having similar structure to the Earth (thin atmosphere surrounding a solid surface) the lack of oceans, the presence of dust and the large influence that the huge topographic features exert on the atmosphere make it different enough to encourage the search of new modelling methods.

We are also investigating synchronisation in simplified models for the Quasi-Biennial Oscillation, when coupled to the annular and semi-annular mode.

Links

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Comparing continuous and discrete nonlinear dynamics

This project deals with the nonlinear dynamics of electronic circuits focusing on the Moore-Spiegel equations. The study has both an experimental and analytical component. Huge data sets are generated at certain parameter values and then subjected to analysis by different tools.

Links

Centre for the Analysis of Time Series, London School of Economics
Nonlinear Dynamics Group, Institute of Physics, University of Potsdam

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Baroclinic flows

This project builds on the results of two existing DPhil studies into the use of empirically determined basis functions, calculated from time series of the velocity fields to generate low order nonlinear models of more complicated baroclinic flows. These include numerical models of the Martian atmosphere in which topographic features are included, as well as laboratory models of more complicated baroclinic flows.

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Predicting nonlinear systems with uncertainties: The data assimiation method

Data assimilation encompasses the techniques which utilize the information content from both the observations of the system states and the prior information (also called the background) to estimate the system states. This is an area with important applications to meteorology, geophysics, oceanography and so on. This project aims to study advanced data assimilation techniques like four dimensional variational data assimilation (4D-Var), ensemble Kalman filters (EnKFs), and investigate the factors that may affect their performances. Current work involves full waveform inversion for seismic problems.

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