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Phonene-based topic spotting on the switchboard corpus
(Stellenbosch : Stellenbosch University, 2002-04)
ENGLISH ABSTRACT: The field of topic spotting in conversational speech deals with the problem of identifying
"interesting" conversations or speech extracts contained within large volumes of speech
data. Typical applications ...
Analysis and implementation of the speaker adaptation techniques : MAP, MLLR, and MLED
(Stellenbosch : Stellenbosch University, 2002-12)
ENGLISH ABSTRACT: The topic of this thesis is speaker adaptation, whereby speaker-independent speech models
are adapted to more closely match individual speakers by utilising a small amount of
data from the targeted ...
Evaluation of modern large-vocabulary speech recognition techniques and their implementation
(Stellenbosch : University of Stellenbosch, 2009-03)
In this thesis we studied large-vocabulary continuous speech recognition.
We considered the components necessary to realise a large-vocabulary speech
recogniser and how systems such as Sphinx and HTK solved the ...
The design of a high-performance, floating-point embedded system for speech recognition and audio research purposes
(Stellenbosch : Stellenbosch University, 2008-03)
This thesis describes the design of a high performance, floating-point, standalone embedded
system that is appropriate for speech and audio processing purposes.
The system successfully employs the Analog Devices TigerSHARC ...
Automatic alignment and error detection for phonetic transcriptions in the African speech technology project databases
(Stellenbosch : University of Stellenbosch, 2006-03)
The African Speech Technology (AST) project ran from 2000 to 2004 and involved collecting speech data for five South African languages, transcribing the data and building automatic speech recognition systems in these ...
Non-acoustic speaker recognition
(Stellenbosch : University of Stellenbosch, 2004-12)
ENGLISH ABSTRACT: In this study the phoneme labels derived from a phoneme recogniser are used for phonetic
speaker recognition. The time-dependencies among phonemes are modelled by using
hidden Markov models (HMMs) for ...
Fusion of phoneme recognisers for South African English
(Stellenbosch : University of Stellenbosch, 2009-03)
ENGLISH ABSTRACT: Phoneme recognition systems typically suffer from low classification accuracy. Recognition
for South African English is especially difficult, due to the variety of vastly different accent
groups. This ...
USB telephony interface device for speech recognition applications
(Stellenbosch : University of Stellenbosch, 2005-12)
Automatic speech recognition (ASR) systems are an attractive means for companies to deliver value added
services with which to improve customer satisfaction. Such ASR systems require a telephony interface to
connect the ...
Unsupervised clustering of audio data for acoustic modelling in automatic speech recognition systems
(Stellenbosch : University of Stellenbosch, 2011-03)
ENGLISH ABSTRACT: This thesis presents a system that is designed to replace the manual process of
generating a pronunciation dictionary for use in automatic speech recognition.
The proposed system has several stages.
The ...
Tree-based Gaussian mixture models for speaker verification
(Stellenbosch : University of Stellenbosch, 2005-12)
The Gaussian mixture model (GMM) performs very effectively in applications
such as speech and speaker recognition. However, evaluation speed is greatly
reduced when the GMM has a large number of mixture components. ...