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2017

Febe de Wet, Neil Kleynhans, Dirk van Compernolle and Reza Sahraeian, Speech recognition for under-resourced languages: data sharing in hidden Markov model systems, South African Journal of Science, Vol 113, No 1/2, pp 25-33, January 2017.

Oluwapelumi Giwa and Marelie Davel, “Bilateral G2P accuracy: measuring the effect of variants”, in Proc. Annual Symp. Pattern Recognition Association of South Africa and Mechatronics International Conference (PRASA-RobMech), pp 208-213, Bloemfontein, South Africa, November 2017.

Oluwapelumi Giwa and Marelie Davel, The effect of language identification accuracy on speech recognition accuracy of proper names”, in Proc. Annual Symp. Pattern Recognition Association of South Africa and Mechatronics International Conference (PRASA-RobMech), pp 187-192, Bloemfontein, South Africa, November 2017.

Christiaan M. van der Walt and Etienne Barnard, Variable kernel density estimation in high-dimensional feature spaces, in Proc. AAAI Conf. on Artificial Intelligence (AAAI-17), pp 2674-2680, February 2017.

Charl van Heerden, Damianos Karakos, Karthik Narasimhan, Marelie Davel and Richard Schwartz, “Constructing sub-word units for spoken term detection”, in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP), pp 5780-5784, New Orleans,  Louisiana, March 2017.

Daniel R. van Niekerk, Evaluating acoustic modelling of lexical stress for Afrikaans speech synthesis, in Proc. Annual Symp. Pattern Recognition Association of South Africa and Mechatronics International Conference (PRASA-RobMech), pp 86-91, Bloemfontein, South Africa, November 2017.

Daniel Rudolph van Niekerk, Charl van Heerden, Marelie Davel, Neil Kleynhans, Oddur Kjartansson, Martin Jansche and Linne Ha, Rapid development of TTS corpora for four South African languages, in Proc. Interspeech, pp 2178-2182, Stockholm, Sweden, August 2017.

 

2016

Neil Kleynhans, William Hartman, Daniel van Niekerk, Charl van Heerden, Rich Schwartz, Stavros Tsakalidis and Marelie Davel, Code-switched English pronunciation modeling for Swahili spoken term detection, Procedia Computer Science: Spoken Language Technology for Under-resourced Languages, pp 128-135, Yogyakarta, Indonesia, May 2016.

Charl van Heerden, Neil Kleynhans and Marelie Davel, Improving the Lwazi ASR baseline, in Proc. Interspeech, pp 3529-3538, San Francisco, USA, September 2016.

Daniel van Niekerk, Syllabification for Afrikaans speech synthesis, in Proc. Pattern Recognition Association of South Africa and Robotics and Mechatronics International Conference (PRASA-RobMech), pp 31-36, Stellenbosch, South Africa, December 2016.

 

2015

Jaco Badenhorst and Marelie Davel, Synthetic triphones from trajectory-based feature distributions, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 118-122, Port Elizabeth, South Africa, November 2015.

Marelie Davel, Damianos Karakos, Etienne Barnard, Charl van Heerden, Richard Schwartz and Stavros Tsakalidis, William Hartmann, Exploring minimal pronunciation modeling for low resource languages, in Proc. Interspeech, pp 538-542, Dresden, Germany, September 2015.

Oluwapelumi Giwa and Marelie Davel, Text-based Language Identification of Multilingual Names, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 166-171, Port Elizabeth, South Africa, November 2015.

Neil Kleynhans, Febe de Wet and Etienne Barnard, Unsupervised acoustic model training: comparing South African English and isiZulu, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 136 - 141, Port Elizabeth, South Africa, November 2015.

Kleynhans, Neil Taylor, and Etienne Barnard, Efficient data selection for ASR, Language Resources and Evaluation, Vol 49, issue 2, pp 327-353, June 2015.

Thipe Modipa and Marelie Davel, Predicting vowel substitution in code-switched speech, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 154-159, Port Elizabeth, South Africa, November 2015. 

Daan Wissing, Wikus Pienaar and Daniel van Niekerk, Palatalisation of /s/ in Afrikaans in Stellenbosch Papers in Linguistics Plus, Vol 48, pp 137-158, 2015. 

 

2014

Etienne Barnard, Marelie H. Davel, Charl van Heerden, Febe de Wet and Jaco Badenhorst, “The NCHLT Speech Corpus of the South African languages”, in Proc. Int. Workshop Spoken Language Technologies for Under-resourced Languages (SLTU), pp 194-200, St Petersburg, Russia, May 2014.

Laurent Besacier, Etienne Barnard, Alexey Karpov and Tanja Schultz, “Introduction to the special issue on processing under-resourced languages”, Speech Communications, Vol 56, pp 83-84, January 2014.

Laurent Besacier, Etienne Barnard, Alexey Karpov and Tanja Schultz, “Automatic speech recognition for under-resourced languages: A survey”, Speech Communications, Vol 56, pp 85-100, January 2014.

Nic J. De Vries, Marelie H. Davel, Jaco Badenhorst, Willem D. Basson, Febe De Wet, Etienne Barnard and Alta De Waal, “A smartphone-based ASR data collection tool for under-resourced languages”, Speech Communications, Vol 56, pp 119-131, January 2014.

Pieter De Villiers, Etienne Barnard, Charl Van Heerden and Petri Jooste, “Semi-Supervised Training for Lecture Transcription in Resource-Scarce Environments”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 7-12, Cape Town, South Africa, November 2014.

Oluwapelumi Giwa and Marelie H. Davel, “Language identification of individual words with joint sequence models”, in Proc. Interspeech, pp 1400-1404, Singapore, September 2014.

Florian Metze, Xavier Anguera, Etienne Barnard, Marelie Davel and Guillaume Gravier, “Language Independent Search in MediaEval's Spoken Web Search Task”, Computer Speech & Language, Vol 28, Issue 5, pp 1066-1082, September 2014.

Raymond Molapo and Etienne Barnard, “Number pronunciation in a multilingual environment and implications for an ASR system”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 138-141, Cape Town, South Africa, November 2014.

Raymond Molapo, Etienne Barnard, Febe de Wet, “Speech data collection in an under-resourced language within a multilingual context”, in Proc. Int. Workshop Spoken Language Technologies for Under-resourced Languages (SLTU), pp 238-242, St Petersburg, Russia, May 2014.

Charl van Heerden, Marelie Davel and Etienne Barnard, “Performance analysis of a multilingual directory enquiries application”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 258-263, Cape Town, South Africa, November 2014.

Daniel van Niekerk and Etienne Barnard, “Predicting utterance pitch targets in Yorùbá for tone realisation in speech synthesis”, Speech Communications, Vol 56, pp 229-242, January 2014.

Daniel van Niekerk and Etienne Barnard, “A Target Approximation Intonation Model for Yorùbá TTS”, in Proc. Interspeech, pp 36-40, Singapore, September 2014.

 

2013

Willem D. Basson and Marelie H. Davel, “Category-based phoneme-to-grapheme transliteration”,  in Proc. Interspeech, pp 1956 – 1960, Lyon, France, Aug. 2013.

Marelie Davel, Charl van Heerden, and Etienne Barnard. “G2P variant prediction techniques for ASR and STD”, in Proc. Interspeech, pp 1831-1835, Lyon, France, Aug. 2013.

Oluwapelumi Giwa and Marelie H. Davel, “N-gram based Language Identification of Individual Words”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp15-22, Johannesburg, South Africa, December 2013.

Allan Hanbury, Hendra Van Zyl, Cèlia Boyer and Etienne Barnard, “Adapting mobile medical information search to low-resourced areas”, in Proc. IST-Africa Conf. and Exhibition (IST-Africa), pp 1-8, Nairobi, Kenya, May 2013.

Neil Kleynhans and Etienne Barnard, “Cross-bandwidth adaptation for ASR systems”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 36-43, Johannesburg, South Africa, December 2013.

Neil Kleynhans and Etienne Barnard, “Spoken language identification system adaptation in under-resourced environments”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 45-51, Johannesburg, South Africa, December 2013.

Florian Metze, Xavier Anguera, Etienne Barnard, Marelie Davel, and Guillaume Gravier, “The Spoken Web Search task at Mediaeval 2012”, in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing  (ICASSP), pp 8121-8125, Vancouver, Canada, May 2013.

Thipe Modipa, Marelie H. Davel and Febe de Wet , “Implications of Sepedi/English code switching for ASR systems”, in Proc.  Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 64-69, Johannesburg, South Africa, December 2013.

Raymond Molapo, Etienne Barnard and Febe de Wet, A Distributed Approach to Speech Resource Collection, in Proc.  Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 70-75, Johannesburg, South Africa, December 2013.

Tembalethu Jama Ndwe, Etienne Barnard and Thato Foko, “Correlation between rapid learnability and user preference in IVR systems for developing regions”, in Proc. IST-Africa Conf. and Exhibition (IST-Africa), pp 1-9,Nairobi, Kenya, May 2013.

Tembalethu Jama Ndwe and Etienne Barnard, “Consequences of culturally inclined earcons in speech technology design for oral users in South Africa”, in Proc. of the 3rd ACM Symp. on Computing for Development (DEV 2013), pp. 32-39, Bangalore, India, January, 2013.

Georg Schlunz and Etienne Barnard, “A Discourse Model of Affect for Text-to-Speech Synthesis”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 91-98, Johannesburg, South Africa, December 2013.

Christiaan van der Walt and Etienne Barnard, “Kernel bandwidth estimation for non-parametric density estimation: a comparative study”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 107-114, Johannesburg, South Africa, December 2013.

Charl van Heerden, Marelie H. Davel and Etienne Barnard, “The semi-automated creation of stratified speech corpora”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 115-119, Johannesburg, South Africa, December 2013.

 

2012

Jaco Badenhorst, Marelie H. Davel and Etienne Barnard, “Improved transition models for cepstral trajectories“, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 157-164, Pretoria, South Africa, November 2012.

Willem D. Basson and Marelie H. Davel, “Comparing grapheme-based and phoneme-based speech recognition for Afrikaans”,  in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA),  pp 144-148 , Pretoria, South Africa, November 2012.

Adéle Botha, Karen Calteaux, Marlien Herselman, Aditi Sharma Grover and Etienne Barnard, “Mobile User Experience for Voice Services: A Theoretical Framework”, in Proc. of the 3rd Int. Conf. on Mobile Communication for Development, pp 1-10, New Delhi, India, February 2012.

Gerrit Reinier Botha and Etienne Barnard, “Factors that affect the accuracy of text-based language identification”, Computer Speech and Language, Vol 26, No 5, pp 307-320, October 2012.

Marelie H. Davel, Charl J. van Heerden and Etienne Barnard, “Validating smartphone-collected speech corpora”, in Proc. Int. Workshop Spoken Language Technologies for Under-resourced Languages (SLTU), pp 68-75, Cape Town, South Africa, May 2012.

Pieter de Villiers, Petri Jooste, Charl J. van Heerden and Etienne Barnard, “Towards lecture transcription in resource-scarce environments”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 138 -143, Pretoria, South Africa, November 2012.

Aditi Sharma Grover, Karen Calteaux, Etienne Barnard and Gerhard van Huyssteen, “A voice service for user feedback on school meals”, in Proc. of the 2nd ACM Symp. on Computing for Development (DEV 2012), pp 13, Atlanta, USA,  March 2012.

Florian Metze, Etienne Barnard, Marelie Davel, Charl van Heerden, Xavier Anguera, Guillaume Gravier, and Nitendra Rajput, “The Spoken Web Search task”, in Proc. MediaEval Workshop, Pisa, Italy, October 2012.

Florian Metze, Nitendra Rajput, Xavier Anguera, Marelie Davel, Guillaume Gravier, Charl van Heerden, Gautam V. Mantena, Armando Muscariello, Kishore Prahallad, Igor Szöke, and Javier Tejedor, “The spoken web search task at MediaEval 2011”, in Proc. Int. Conf. on Acoustics, Speech and Signal Processing  (ICASSP), pp 5165-5168, Kyoto, Japan, March 2012.

Thipe I. Modipa, Marelie H. Davel and Febe de Wet, “Context-dependant modelling of English vowels in Sepedi code-switched speech”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 173-178, Pretoria, South Africa, November 2012.

Tembalethu Jama Ndwe, Etienne Barnard and Mqhele E. Dlodlo, “Effects of application type on the choice of interaction modality in IVR systems”, in Proc. South African Inst. for Computer Scientists and Information Technologists Conf. (SAICSIT), pp 236-242, Pretoria, South Africa, October 2012.

James K. Tamgno, Etienne Barnard, Claude Lishou and Morgan Richomme, “Wolof Speech Recognition Model of Digits and Limited-Vocabulary Based on HMM and ToolKit”,  in Proc. Computer Modelling and Simulation (UKSim), pp 389-395, Cambridge, Cambridgeshire United Kingdom, March 2012.

Jan W. F. Thirion, Marelie H. Davel and Etienne Barnard, “Multilingual pronunciation of proper names in a Southern African corpus”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 102-108, Pretoria, South Africa, November 2012.

Charl van Heerden, Marelie H. Davel and Etienne Barnard, “Medium-vocabulary speech recognition for under-resourced languages”,  in Proc. Int. Workshop Spoken Language Technologies for Under-resourced Languages (SLTU), pp 146-151, Cape Town, South Africa, May 2012.

Charl J. van Heerden, Febe de Wet and Marelie H. Davel, “Automatic alignment of audiobooks in Afrikaans”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA),  pp 187-191, Pretoria, South Africa, November 2012.

Daniel van Niekerk and Etienne Barnard, “Generating fundamental frequency contours for speech synthesis in Yoruba, in Proc. Interspeech, pp 451-455, Lyon, France, Aug. 2013.

D Van Niekerk, Etienne Barnard, “Tone realisation in a Yorùbá corpus”, in Proc.  Int. Workshop Spoken Language Technologies for Under-resourced Languages (SLTU), pp 54-59, Cape Town, South Africa, May 2012.

 

2011

Jaco Badenhorst, Marelie H Davel and Etienne Barnard, “Trajectory behaviour at different phonemic context sizes”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 1-6, Vanderbijlpark, South Africa, November 2011.

Jaco Badenhorst, Charl van Heerden, Marelie Davel and Etienne Barnard, “Collecting and evaluating speech recognition corpora for 11 South African languages”, Language resources and evaluation, Springer Netherlands, pp 289-309, September 2011.

Etienne Barnard, Marelie Davel, Charl van Heerden, Neil Kleynhans and Kalika Bali, “Phone recognition for spoken web search”, in MediaEval Workshop, Pisa, Italy, September 2011.

Etienne Barnard, “Determination and the no-free-lunch paradox”, Neural Computation, MIT Press, Vol 23, Issue 7, pp 1899-1909, July 2011.

Chris R Burger, Etienne Barnard and Thomas Jone, “Speech systems for autonomous unmanned aircraft: Enabling autonomous unmanned aircraft to communicate in civil airspace”, Int. Aerospace Symp. of South Africa (IASSA), Centurion, South Africa, September 2011.

Marelie H Davel, Charl Van Heerden, Neil Kleynhans and Etienne Barnard, “Efficient harvesting of Internet audio for resource-scarce ASR”, in Proc. Interspeech, pp 3153-3156, Florence, Italy, August 2011.

Nic J De Vries, Jaco Badenhorst, Marelie H Davel, Etienne Barnard and Alta de Waal, “Woefzela - an open-source platform for ASR data collection in the developing world”, in Proc. Interspeech, pp 3177-3180, Florence, Italy, August 2011.

Oluwapelumi Giwa, Marelie H Davel and Etienne Barnard,  “A Southern African corpus for multilingual name pronunciation”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 49-53, Vanderbijlpark, South Africa, November 2011.

Aditi Sharma Grover and Etienne Barnard, “Comparing two developmental applications of speech technology”, in Proc. Conf. on Human Language Technology for Development (HLTD2011), pp 81-86, Alexandria, Egypt, May 2011.

Aditi Sharma Grover and Etienne Barnard,  “The Lwazi Community Communication Service: design and piloting of a voice-based information service”, in Proc. World Wide Web Conf. (WWW 11), pp 433-442, Hyderabad, India, March 2011.

Evandro Gouvêa and Marelie H Davel, “Kullback-Leibler divergence-based ASR training data selection”, in Proc. Interspeech, pp 2297-2300, Florence, Italy, August 2011.

Mpho Kgampe and Marelie H Davel, “The predictability of name pronunciation errors in four South African languages”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 85-90, Vanderbijlpark, South Africa, November 2011.

Tembalethu Ndwe, Etienne Barnard, Renee Koen and Bryan McAlister, “Efficiency measurements in IVR systems for oral users: Consequences of differences in educational levels”, in Proc. South African Inst. for Computer Scientists and Information Technologists Conf. (SAICSIT), pp 171-176, Cape Town, South Africa, October 2011.

Charl J van Heerden, Pieter de Villiers, Etienne Barnard and Marelie H Davel, “Processing spoken lectures in resource-scarce environments”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 138-143, Vanderbijlpark, South Africa, November 2011.

 

2010

Jaco Badenhorst, Marelie H Davel and Etienne Barnard, “Analysing co-articulation using frame-based feature trajectories”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 13-14, Stellenbosch, South Africa, November 2010.

Etienne Barnard, “Maximum leave-one-out likelihood for kernel density estimation”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 19-24, Stellenbosch, South Africa, November 2010.

Etienne Barnard, “Visualizing data in high-dimensional spaces”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 25-32, Stellenbosch, South Africa, November 2010.

Alta De Waal and Etienne Barnard, “Influence of input matrix representation on topic modelling performance”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 69-74, Stellenbosch, South Africa, November 2010.

Georg Schlünz, Etienne Barnard and Gerhard van Huyssteen, “Part-of-speech effects on text-to-speech synthesis”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 257-262, Stellenbosch, South Africa, November 2010.

Charl Van Heerden and Etienne Barnard, “Towards understanding the influence of SVM hyperparameters”, in Proc. Annual Symp. Pattern Recognition Association of South Africa (PRASA), pp 283-288, Stellenbosch, South Africa, November 2010.