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Browsing by Author "Barnard, E"

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  • Van Niekerk, DR; Barnard, E (PRASA 2008, 2008-11)
    The quality of corpus-based text-to-speech (TTS) systems depends strongly on the consistency of boundary placements during phonetic alignments. Expert human transcribers use visually represented acoustic cues in order to ...
  • Badenhorst, J; Davel, MH; Barnard, E (PRASA 2010, 2010-11)
    The authors investigate several approaches aimed at a more detailed understanding of co-articulation in spoken utterances. They find that the Euclidean difference between instantaneous frame-based feature values and the ...
  • Barnard, E; Gouws, E; Wolvaardt, K; Kleynhans, N (PRASA 2004, 2004-11)
    A number of issues realted to the development of speech-recognition systems with Hidden Markov Models (HMM) are discussed. A set of systematic experiments using the HTK toolkit and the TMIT database are used to elucidate ...
  • Barnard, E; Davel, M; Van Heerden, C (ISCA, 2009-09)
    The authors investigate the number of speakers and the amount of data that is required for the development of useable speaker-independent speech-recognition systems in resource-scarce languages. Their experiments employ ...
  • Barnard, E; Davel, M (2006-11)
    The phonetic segmentation of recorded speech is a crucial factor in the quality of concatenative systems for speech synthesis. The authors describe a likelihood-based error detection process that can be used to flag possible ...
  • Badenhorst, JAC; Van Niekerk, DR; Barnard, E (2006-11)
    Improving the pronunciations of non-native language learners is an important task in a multilingual society. We focus on segmental aspects of pronunciation, and investigate the design of automated assistants that can be ...
  • Van Heerden, C; Barnard, E; Davel, M (International Speech Communication Association, 2009-09)
    Spoken dialogue systems (SDSs) have great potential for information access in the developing world. However, the realisation of that potential requires the solution of several challenging problems, including the development ...
  • Van Dyk, E; Barnard, E (PRASA 2008, 2008-11)
    We investigate the use of Naive Bayesian classifiers for correlated Gaussian feature spaces and derive error estimates for these classifiers. The error analysis is done by developing an exact expression for the error ...
  • Davel, MH; Barnard, E (PRASA, 2003-11)
    This paper describes a method for improving the efficiency of the language resource development process through bootstrapping.
  • Davel, MH; Barnard, E (Interspecch 2005, 2005-09)
    Bootstrapping techniques are an efficient way to develop electronic pronunciation dictionaries, but require fast system response to be practical for medium-to-large lexicons. In addition, user errors are inevitable during ...
  • Davel, M; Barnard, E (Acad Science South Africa A S S AF, 2006-07)
    Bootstrapping techniques can accelerate the development of language technology for resource-scarce languages. We (the authors) define a framework for the analysis of a general bootstrapping process whereby a model is ...
  • Davel, M; Barnard, E (2006-02-27)
    Bootstrapping techniques can accelerate the development of language technology for new languages. The authors define a framework for the analysis of a general bootstrapping process whereby a model is improved through a ...
  • Barnard, E (PRASA, 2009-11)
    The authors have previously argued that the infamous "No Free Lunch" theorem for supervised learning is a paradoxical result of a misleading choice of prior probabilities. Here, they provide more analysis of the dangers ...
  • Kleynhans, N; Barnard, E (PRASA 2008, 2008-11)
    The performance of trainable speech-processing systems deteriorates significantly when there is a mismatch between the training and testing data. The data mismatch becomes a dominant factor when collecting speech data for ...
  • Badenhorst, J; Van Heerden, C; Davel, M; Barnard, E (Springer Science+Business Media B.V., 2011-08)
    The authors describe the Lwazi corpus for automatic speech recognition (ASR), a new telephone speech corpus which contains data from the eleven official languages of South Africa. Because of practical constraints, the ...
  • Badenhorst, JAC; Van Heerden, C; Davel, M; Barnard, E (Association for Computational Linguistics, 2009-03)
    The authors describes the Lwazi corpus for automatic speech recognition (ASR), a new telephone speech corpus which includes data from nine Southern Bantu languages. Because of practical constraints, the amount of speech ...
  • Van Heerden, C; Barnard, E (PRASA 2009, 2009-11)
    The authors compare several different classifier combination methods on a single task, namely speaker age classification. This task is well suited to combination strategies, since significantly different feature classes ...
  • Loots, L; Davel, M; Barnard, E; Niesler, T (PRASA 2009, 2009-11)
    Phoneme-to-phoneme (P2P) learning provides a mechanism for predicting the pronunciation of a word based on its pronunciation in a different accent, dialect or language. The authors evaluate the effectiveness of manually-developed ...
  • Sharma Grover, A; Barnard, E (Bibliotheca Alexandrina, 2011-05)
    Over the past decade applications of speech technologies for development (ST4D) have shown much potential for enabling information access and service delivery. In this paper the authors review two deployed ST4D services ...
  • Govender, N; Kuun, C; Zimu, V; Barnard, E; Davel, M (2006-04)
    Two related issues were investigated in the computational modeling of Nguni prosody, based on annotated databases of isiZulu and isiXhosa speech. Firstly, authors show that a simple template can be used to describe the ...