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Browsing by Author "Barnard, E"

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  • De Vries, NJ; Davel, MH; Badenhorst, J; Basson, WD; De Wet, Febe; Barnard, E; De Waal, A (Elsevier, 2014-01)
    Acoustic data collection for automatic speech recognition (ASR) purposes is a particularly challenging task when working with under resourced languages, many of which are found in the developing world. We provide a brief ...
  • Van Heerden, CJ; Barnard, E (18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), 2007-11)
    The durations of phonemes varies for different speakers. To this end, the correlations between phonemes across different speakers are studied and a novel approach to predict unknown phoneme durations from the values of ...
  • Molapo, B; Barnard, E; De Wet, Febe (International Research Insitute, 2014-05)
    In this paper, we present an end-to-end solution to the development of an automatic speech recognition (ASR) system in typical under-resourced languages, where the target language is likely to be influenced by one more ...
  • Van Heerden, CJ; Barnard, E (2006-11)
    A novel approach to speech rate normalization is presented. Models are constructed to model the way in which speech rate variation of a specific speaker influences the duration of phonemes. The models are evaluated in two ...
  • Burger, CR; Barnard, E; Jones, T (IASSA, 2011-09)
    Airspace control is currently based largely on the exchange of speech between aircraft and Air Traffic Service Units, or between aircraft themselves. ICAO regulatory guidelines make no distinction between unmanned and ...
  • Barnard, E; Davel, MH; Van Huyssteen, GB (AAAI, 2010-03)
    Telephone-based information access has the potential to deliver a significant positive impact in the developing world. We discuss some of the most important issues that must be addressed in order to realize this potential, ...
  • Martirosian, O; Barnard, E (18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), 2007-11)
    The authors explore the construction of a system to classify the dominant emotion in spoken utterances, in an environment where resources such as labelled utterances are scarce. The research addresses two issues relevant ...
  • Kleynhans, N; Barnard, E (PRASA 2013 Proceedings, 2013-12)
    Speech technologies have matured over the past few decades and have made significant impacts in a variety of fields, from assistive technologies to personal assistants. However, speech system development is a resource ...
  • Kuun, C; Zimu, V; Barnard, E; Davel, M (PRASA, 2005-11)
    We study the relationship between lexical tone and measured values of fundamental frequency for several word classes in isiZulu, based on objective measurements from recordings of three speakers. For nouns and adjectives, ...
  • Ronald, K; Barnard, E (2006-11)
    Statistical machine translation techniques offer great promise for the development of automatic translation systems. However, the realization of this potential requires the availability of significant amounts of parallel ...
  • Naidoo, S; Barnard, E (ALASA 2005, 2005-07)
    Telephone-based information services hold tremendous potential as a means of information access in the developing world. However,surprisingly little research has been done on the design of such systems - whether basic ...
  • Botha, G; Zimu, V; Barnard, E (2006-11)
    The authors investigate the performance of text-based language identification systems on the 11 official languages of South Africa, when n-gram statistics are used as features for classification. In particular, the authors ...
  • Van Niekerk, D; Barnard, E (2012-05)
    The authors investigate the acoustic realisation of tone in short continuous utterances in Yoruba. Fundamental frequency contours are extracted for automatically aligned syllables from a speech corpus of 33 speakers collected ...
  • Barnard, E; Cloete, L; Patel, Hina M; Coetzee, L (2003-09)
    Government regulations have combined with a tremendous growth in prepaid cellular telephony to bring telephone connectivity to an unprecedented number of South African citizens – thus creating an ideal platform for delivering ...
  • Van Heerden, CJ; Barnard, E (PRASA 2010, 2010-11)
    In this article, the authors investigate the relationship between SVM hyperparameters for linear and RBF kernels and classification accuracy. The process of finding SVM hyperparameters usually involves a gridsearch, which ...
  • Badenhorst, J; Davel, MH; Barnard, E (PRASA, 2011-11)
    The authors propose a piecewise-linear model for the temporal trajectories of Mel Frequency Cepstral Coefficients during phone transitions. As with conventional Hidden Markov Models, the parameters of the model can be ...
  • Botha, G; Barnard, E (PRASA, 2005-11)
    Many applications of pattern recognition to natural language processing require large text corpora in a specified language. For many of the languages of the world, such corpora are not readily available, but significant ...
  • Kleynhans, N; De Wet, Febe; Barnard, E (IEEE, 2015-11)
    Large amounts of untranscribed audio data are generated every day. These audio resources can be used to develop robust acoustic models that can be used in a variety of speech-based systems. Manually transcribing this data ...
  • Van Heerden, CJ; Barnard, E (PRASA, 2005-11)
    This paper presents an analysis of temporal information as a feature for use in speaker verification systems. The relevance of temporal information in a speaker’s utterances is investigated, both with regard to improving ...
  • Barnard, E; Plauche, M; Davel, M (IEEE, 2008-12)
    The commercial successes of spoken dialog systems in the developed world provide encouragement for their use in the developing world, where speech could play a role in the dissemination of relevant information in local ...