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Browsing by Author "Davel, MH"

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Implications of Sepedi/English code switching for ASR systems

Author: Modipa, TI ; Davel, MH ; De Wet, Febe Date: Dec 2013 Code switching (the process of switching from one language to another during a conversation) is a common phenomenon in multilingual environments. Where a minority and dominant language coincide, code switching from the minority language to ... Read more
Improved transition models for cepstral trajectories

Author: Badenhorst, J ; Davel, MH ; Barnard, E Date: Nov 2012 We improve on a piece-wise linear model of the trajectories of Mel Frequency Cepstral Coefficients, which are commonly used as features in Automatic Speech Recognition. For this purpose, we have created a very clean single-speaker corpus, ... Read more
Learning rules and categorization networks for language standardization

Author: Van Huyssteen, GB ; Davel, MH Date: Jun 2010 In this research, the authors use machine learning techniques to provide solutions for descriptive linguists in the domain of language standardization. With regard to the personal name construction in Afrikaans, the authors perform function ... Read more
The NCHLT speech corpus of the South African languages

Author: Barnard, E ; Davel, MH ; Van Heerden, C ; De Wet, Febe ; Badenhorst, J Date: May 2014 The NCHLT speech corpus contains wide-band speech from approximately 200 speakers per language, in each of the eleven of cial languages of South Africa. We describe the design and development processes that were undertaken in order to develop ... Read more
Phonotactic spoken language identification with limited training data

Author: Peche, M ; Davel, MH ; Barnard, E Date: Aug 2007 The authors investigate the addition of a new language, for which limited resources are available, to a phonotactic language identification system. Two classes of approaches are studied: in the first class, only existing phonetic recognizers ... Read more
Pitch modelling for the Nguni languages

Author: Govender, Natasha ; Barnard, E ; Davel, MH Date: Jun 2007 Although the complexity of prosody is widely recognised, the lack of widely-accepted descriptive standards for prosodic phenomena has meant that prosodic systems for most of the languages of the world have, at best, been described in ... Read more
The predictability of name pronunciation errors in four South African languages

Author: Kgampe, M ; Davel, MH Date: Nov 2011 Personal names are often pronounced in very different ways depending on the language background of the speaker. We seek to determine whether some of these pronunciations ‘errors’ are systematic and if so, in which ways. Specifically, we analyze ... Read more
Processing spoken lectures in resource-scarce environments

Author: Van Heerden, CJ ; De Villiers, P ; Barnard, E ; Davel, MH Date: Nov 2011 Initial work towards processing Afrikaans spoken lectures in a resource-scarce environment is presented. Two approaches to acoustic modeling for eventual alignment are compared: (a) using a well-trained target-language acoustic model and (b) ... Read more
Pronunciation modelling and bootstrapping

Author: Davel, MH Date: Aug 2005 Bootstrapping techniques have the potential to accelerate the development of language technology resources. This is of specific importance in the developing world where language technology resources are scarce and linguistic diversity is high. ... Read more
Pronunciation modelling of foreign words for Sepedi ASR

Author: Modipa, T ; Davel, MH Date: Nov 2010 This study focuses on the effective pronunciation modelling of words from different languages encountered during the development of a Sepedi automatic speech recognition (ASR) system. While the speech corpus used for training the ASR system ... Read more
A smartphone-based ASR data collection tool for under-resourced languages

Author: De Vries, NJ ; Davel, MH ; Badenhorst, J ; Basson, WD ; De Wet, Febe ; Barnard, E ; De Waal, A Date: Jan 2014 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 overview of related ... Read more
Speech technology for information access: a South African case study

Author: Barnard, E ; Davel, MH ; Van Huyssteen, GB Date: Mar 2010 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, including matters ... Read more
Synthetic triphones from trajectory-based feature distributions

Author: Badenhorst, J ; Davel, MH Date: Nov 2015 We experiment with a new method to create synthetic models of rare and unseen triphones in order to supplement limited automatic speech recognition (ASR) training data. A trajectory model is used to characterise seen transitions at the spectral ... Read more
Text-based language identification of multilingual names

Author: Giwa, O ; Davel, MH Date: Nov 2015 Text-based language identification (T-LID) of isolated words has been shown to be useful for various speech processing tasks, including pronunciation modelling and data categorisation. When the words to be categorised are proper names, the ... Read more
Trajectory behaviour at different phonemic context sizes

Author: Badenhorst, J ; Davel, MH ; Barnard, E Date: Nov 2011 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 estimated for different ... Read more
Verifying pronunciation dictionaries using conflict analysis

Author: Davel, MH ; De Wet, Febe Date: Sep 2010 The authors describe a new language-independent technique for automatically identifying errors in an electronic pronunciation dictionary by analyzing the source of conflicting patterns directly.They evaluate the effectiveness of the technique ... Read more
Woefzela - An open-source platform for ASR data collection in the developing world

Author: De Vries, NJ ; Badenhorst, J ; Davel, MH ; Barnard, E ; De Waal, A Date: Aug 2011 Building transcribed speech corpora for under-resourced languages plays a pivotal role in developing speech technologies for such languages. The authors have developed an open-source tool for devices running the Android operating system to ... Read more

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Browsing by Author "Davel, MH"

Browsing by Author "Davel, MH"

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