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Browsing by Author "Davel, M"

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  • Martirosian, O; Davel, M (2008-11)
    Diphthongs typically form an integral part of the phone sets used in English ASR systems. Because diphthongs can be represented using smaller units (that are already part of the vowel system) this representation may be ...
  • Modipa, T; Davel, M; De Wet, Febe (ACM Digital Library, 2010-10)
    Automatic speech recognition (ASR) systems are increasingly being developed for under-resourced languages, especially for use in multilingual spoken dialogue systems. We investigate different approaches to the acoustic ...
  • 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 ...
  • Modipa, T; De Wet, Febe; Davel, M (PRASA 2009, 2009-11)
    Call routing is an important application of Automatic Speech Recognition (ASR) technology. In this paper the authors discuss the main issues affecting the performance of a call routing system and describe the ASR component ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Kleynhans, N; Hartman, W; Van Niekerk, D; Van Heerden, C; Schwartz, R; Tsakalidis, S; Davel, M (Elsevier, online, 2016-05)
    We investigate modeling strategies for English code-switched words as found in a Swahili spoken term detection system. Code switching, where speakers switch language in a conversation, occurs frequently in multilingual ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Badenhorst, JAC; Davel, M (PRASA 2008, 2008-11)
    When developing speech recognition systems in resource-constrained environments, careful design of the training corpus can play an important role in compensating for data scarcity. One of the factors to consider relates ...
  • Davel, M; Barnard, E (2006-09)
    Pronunciation lexicons often contain pronunciation variants. This can create two problems: It can be difficult to define these variants in an internally consistent way and it can also be difficult to extract generalised ...
  • Govender, N; Barnard, E; Davel, M (PRASA, 2005-11)
    In order to bring the tools of statistical pattern recognition to bear on intonation modelling, we need tailor-made corpora in the languages of interest. We describe how two such corpora were developed (for isiZulu and ...
  • Davel, M; Barnard, E (2006-11)
    When developing a language resource, there is generally a trade-off between the amount of effort invested in the resource creation process and the quality of the resulting resource. We (authors) argue that, in the developing ...
  • Martirosian, O; Davel, M (18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA 2007), 2007-11)
    The authors explore pattern recognition techniques for verifying the correctness of a pronunciation lexicon, focusing on techniques that require limited human interaction. They evaluate the British English Example Pronunciation ...
  • Davel, M; Barnard, E (2006-04)
    Various automated techniques can be used to generalise from phonemic lexicons through the extraction of grapheme-to-phoneme rule sets. These techniques are particularly useful when developing pronunciation models for ...
  • Louw, A; Davel, M; Barnard, E (4th International Conference of the African Language Association of Southern Africa (ALASA), 2005-07)
    A general-purpose isiZulu text-to-speech (TTS) system was developed, based on the “Multisyn” unit-selection approach supported by the Festival TTS toolkit. The development involved a number of challenges related to the ...