2024
- Strydom, Q; Geldenhuys, C.M; Wolhuter, R; Niesler, T.R.
The sky is the limit: Evaluating the Argos Satellite Constellation’s coverage in different terrain.
Proceedings of the Southern Africa Telecommunication Networks and Applications Conference (SATNAC) , Skukuza, South Africa, 2024.
- Karan, B; Jansen van V\"{u}ren, de Wet, F; J; Niesler, T.R.
A transformer-based voice activity detector.
Proceedings of Interspeech, Kos, Greece, September 2024.
- Jansen van V\"{u}ren, de Wet, F; J; Niesler, T.R.
Automatic partitioning of a code-switched speech corpus using mixed-integer programming.
Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING), Torino, Italy, 2024.
2023
- Janssen, S; Upton, C.M; De Jager, V.R; Faraj, A; Pahar, M; Miranda, I.D; Diacon, A.H; Simonsson, U.S; Niesler, T.R.
Cough as Non-Invasive Biomarker for Monitoring Tuberculosis Treatment: A Proof-of-Concept Study
Annals of the American Thoracic Society , doi: 10.1513/AnnalsATS.202305-456RL, 2023.
- Geldenhuys, C.M; Niesler, T.R.
Kleinvoet: a Spatially-Distributed Temporally-Synchronised Infrasonic Recorder.
Journal of Open Hardware, vol. 7, no. 1, pp. 1–14. doi: 10.5334/joh.58, 2023.
- Pahar, M; Miranda, I; Diacon, A; Niesler T.R.
Accelerometer-based bed occupancy detection for automatic, non-invasive long-term cough monitoring
IEEE Access , vol. 11, pp. 30739-30752, doi: 10.1109/ACCESS.2023.3261557, 2023.
- Kruger, R.P; de Wet, F; Niesler, T.R
Mathematical content browsing for print-disabled readers based on virtual-world exploration and audio-visual sensory substitution
ACM Transactions on Accessible Computing , doi: 10.1145/3584365, 2023
- Jansen van Vüren, J; Niesler, T.R.
Code-switched language modelling using a code predictive LSTM in under-resourced South African languages.
Proceedings of the IEEE Spoken Language Technology Workshop (IEEE SLT) , Doha, Qatar, 2023.
- Jansen van Vüren, J; Niesler, T.R.
Improving Under-Resourced Code-Switched Speech Recognition: Large Pre-trained Models or Architectural Interventions.
Proceedings of Interspeech , Dublin, Irelend, 2023.
- van der Westhuizen, E; Ribeiro, M; Jansen van Vüren, J; Hidalgo-Sanchis, P; Niesler, T.R.
Low-resource ASR-free keyword spotting using listen-and-confirm
Proceedings of the second Annual Meeting of the Special Interest Group on Under-resourced Languages (SIGUL) , Dublin, Ireland, 2023.
2022
- Jansen van Vüren, J.M; Niesler, T.R.
Improving n-best rescoring in under-resourced code-switched speech recognition using pretraining and data augmentation.
Languages , vol. 7, no. 3:236, 2022.
- Struwig, M.N; Wolhuter, R; Strauss, J; Niesler, T.R.
Time-domain model and optimization for single-axis kinetic energy harvesters driven by arbitrary non-harmonic excitation.
Journal of Physics Communications , 2022.
- Pahar, M; Miranda, I; Diacon, A; Niesler T.R.
Automatic Non‑Invasive Cough Detection based on Accelerometer and Audio Signals. }
Journal of Signal Processing Systems doi: 10.1007/s11265-022-01748-5, 2022.
- Pahar, M; Klopper, M; Warren, R; Niesler, T.R.
COVID-19 detection in cough, breath and speech using deep transfer learning and bottleneck features,
Computers in Biology and Medicine , vol. 141, pp. 105153, doi:10.1016/j.compbiomed.2021.105153, 2022.
- van der Westhuizen, E; Kamper, H; Menon, R; Quinn, J; Niesler, T.R.
Feature learning for efficient ASR-free keyword spotting in low-resource languages.
Computer Speech and Language , vol 71, pp. 101275, doi:10.1016/j.csl.2021.101275, 2022.
- Biswas, A; Yilmaz, E; van der Westhuizen, E; de Wet, F; Niesler, T.R.
Code-switched automatic speech recognition in five South African languages.
Computer Speech and Language , vol 71, pp. 101262, doi:10.1016/j.csl.2021.101262, 2022.
- Frost, G, Morris, E; Jansen van Vüren, Niesler, TR.
Fine-Tuned Self-Supervised Speech Representations for Language Diarization in Multilingual Code-Switched Speech ,
Proceedings of the Southern African Conference for Artificial Intelligence Research (SACAIR) , Stellenbosch, South Africa, December 2022.
- van Zyl, A.C; Wiehan, E; Cilliers, J.E; Niesler, T.R.
Optimised multi-parameter NLFM pulse compression waveform for low time-bandwidth radar,
Proceedings of The IET International Conference on Radar Systems , Edinburgh, U.K., October 2022.
- Frost, G; Theron, G, Niesler, TR.
TB or not TB? Acoustic cough analysis for tuberculosis classification ,
Proceedings of Interspeech , Incheon, Korea, September 2022.
- Pahar, M; Theron, G; Niesler, T.R. \
Automatic Tuberculosis detection in cough patterns using NLP-style cough embeddings ,
Proceedings of the Eighth International Conference on Engineering and Emerging Technologies (ICEET) , Kuala Lumpur, Malaysia, October 2022.
- Pahar, M; Klopper, M; Reeve, B; Warren, R; Theron, G; Diacon, A; Niesler, T.R.
Wake-Cough: cough spotting and cougher identification for personalised long-term cough monitoring
Proceedings of the 30th European Signal Processing Conference, (EUSIPCO) , Belgrade, Serbia August 2022.
- Pahar, M; Klopper, M; Reeve, B; Warren, R; Theron, G; Diacon, A; Niesler, T.
Automatic Tuberculosis and COVID-19 cough classification using deep learning.
Proceedings of the International Conference on Electrical, Computer and Energy Technologies (ICECET) , Prague, Czech Republic, July 2022.
2021
- Meincken, M; Roux, G.W; Niesler, T.R.
An African violin - The feasibility of using indigenous wood from Southern Africa as tonewood.
South African Journal of Science , vol. 117, no. 11/12, pp. 1-8, doi:10.17159/sajs.2021/11175, 2021.
- Pahar, M; Klopper, M; Warren, R; Niesler T.R.
COVID-19 cough classification using machine learning and global smartphone recordings.
Computers in Biology and Medicine , vol 135, pp. 104572, doi:10.1016/j.compbiomed.2021.104572, 2021.
- Pahar, M; Klopper, M; Reeve, B; Warren, R; Theron, G; Niesler, T.R.
Automatic cough classification for tuberculosis screening in a real-world environment.
Physiological Measurement , vol. 42, no. 10, pp. 105014, doi:10.1088/1361-6579/ac2fb8, 2021.
- Nell, N.J; Mitton, N; Niesler, T.R; Wolhuter, R.
An ad-hoc sensor network for vineyard monitoring.
Proceedings of the Southern Africa Telecommunication Networks and Applications Conference (SATNAC) ,, Central Drakensberg, South Africa, pp. 295-300, 2021.
- van der Westhuizen, E; Padhi, T; Niesler, T.R.
Multilingual training set selection for ASR in under-resourced Malian languages.
Proceedings of the 23rd International Conference on Speech and Computer (SPECOM) ,, St Petersburg, Russia, 2021.
- Jansen van Vueren, J; Niesler, T.R.
Optimised Code-Switched Language Model Data Augmentation in Four Under-Resourced South African Languages.
Proceedings of the 23rd International Conference on Speech and Computer (SPECOM) , St Petersburg, Russia, 2021.
- Pahar, M; Miranda, I; Diacon, A; Niesler, T.R.
Deep neural network based cough detection using bed-mounted accelerometer measurements.
Proceedings of the International Conference on Acoustics, Speech and Signal Processing (ICASSP) , Toronto, Canada, June 2021.
- Wilkinson, N; Niesler, T.R.
A hybrid CNN-BILSTM voice activity detector.
Proceedings of the International Conference on Acoustics, Speech and Signal Processing (ICASSP) , Toronto, Canada, June 2021.
- Miranda, I; Cardoso, G; Pahar, M; Oliveira, G; Niesler, T.R.
Machine Learning Prediction of Hospitalization due to COVID-19 based on Self-Reported Symptoms: A Study for Brazil.
Proceedings of the IEEE EMBS International Conference on Biomedical and Health Informatics (BHI) , pp.1-5, doi:10.1109/BHI50953.2021.9508548, July 2021.
2020
- Padhi, T; Biswas, A; de Wet, F; van der Westhuizen, E; Niesler, T.R.
Multilingual Bottleneck Features for Improving ASR Performance of Code-Switched Speech in Under-Resourced Languages.
Proceedings of the First Workshop on Speech Technologies for Code-switching in Multilingual Communities , Beijing, China, October 2020.
- Kruger, R.P; de Wet, F; Niesler, T.R.
Interactive Image Exploration for Visually Impaired Readers using Audio-augmented Touch Gestures.
Proceedings of the 24th International Conference Information Visualisation (IV 2020) , Melbourne, Australia, September 2020.
- O'Kennedy, M.R; Niesler, T.R; Wolhuter, R; Mitton, N.
Practical evaluation of carrier sensing for a LoRa wildlife monitoring network.
Proceedings of the International Federation for Information Processing Networking Conference (IFIP Networking) , Paris, France June 2020.
- Biswas, A; Yılmaz, E; de Wet, F; van der Westhuizen, E; Niesler, T.R.
Semi-supervised Development of ASR Systems for Multilingual Code-switched Speech in Under-resourced Languages.
Proceedings of the Twelfth International Conference on Language Resources and Evaluation (LREC), Marseille , France, May 2020.
- Biswas, A; de Wet, F; van der Westhuizen, E; Niesler, T.R.
Semi-supervised acoustic and language model training for English-isiZulu code-switched speech recognition.
Proceedings of the Fourth Workshop on Computational Approaches to Linguistic Code-Switching (CS2020) , Marseille, France, May 2020.
- Wilkinson, N; Biswas, A; Yılmaz, E; de Wet, F; van der Westhuizen, E; Niesler, T.R.
Semi-supervised acoustic modelling for five-lingual code-switched ASR using automatically-segmented soap opera speech.
Proceedings of the First Workshop on Spoken Language Technologies for Under-resourced Languages and Collaboration and Computing for Under-Resourced languages (SLTU-CCURL) , Marseille, France, May 2020.
2019
- Theart, R; Loos, B; Niesler, T.R.
Regression adjusted colocalisation colour mapping (RACC): A novel biological visual analysis method for qualitative colocalisation analysis of 3D fluorescence micrographs.
PLoS ONE, vol. 14, number 11, e0225141. doi:10.1371/journal.pone.0225141, 2019.
- Biswas, A; Menon, R; van der Westhuizen, E; Niesler, T.R.
Improved low-resource Somali speech recognition by semi-supervised acoustic and language model training.
Proceedings of Interspeech, Graz, Austria, September 2019.
- Menon, R; Kamper, H; van der Westhuizen, E; Quinn, J; Niesler, T.R.
Feature exploration for almost zero-resource ASR-free keyword spotting using a multilingual bottleneck extractor and correspondence autoencoders.
Proceedings of Interspeech, Graz, Austria, September 2019.
- Agenbag, W; Niesler, T.R.
Improving automatically induced lexicons for highly agglutinating languages using data-driven morphological segmentation.
Proceedings of Interspeech, Graz, Austria, September 2019.
- Biswas, A; Yilmaz, E; de Wet, F; van der Westhuizen, E; Niesler, T.R.
Semi-supervised acoustic model training for five-lingual code-switched speech recognition.
Proceedings of Interspeech, Graz, Austria, September 2019.
- Miranda, I.D.S; Diacon, A; Niesler, T.R.
A comparative study of features for acoustic cough detection using deep architectures.
Proceedings of Proceedings of the 41st IEEE Engineering in Medicine and Biology Conference (EMBC) , Berlin, Germany, June 2019.
- van Zyl, F.J; Marais, J; Nieuwoudt, M; Niesler, T.R.
Computer simulation and physical phantom models for estimating the dielectric properties of rhinoceros tissue
PLoS ONE vol. 14, number 5, e0216595. doi:10.1371/journal.pone.0216595, 2019.
- Lerato, L; Niesler, T.R.
Feature trajectory dynamic time warping for clustering of speech segments
EURASIP Journal on Audio, Speech, and Music Processing , vol. 6, doi: 10.1186/s13636-019-0149-9, 2019.
- le Roux, S.P; Wolhuter, R; Niesler, T.R.
Energy-Aware Feature and Model Selection for Onboard Behavior Classification in Low-Power Animal Borne Sensor Applications
IEEE Sensors Journal , vol. 19, no. 7, pp. 2722 - 2734, doi: 10.1109/JSEN.2018.2886890, 2019.
- Agenbag, W; Niesler, TR.
Automatic sub-word unit discovery and pronunciation lexicon induction for ASR with application to under-resourced languages
Computer Speech and Language , vol. 57, pp. 20-40, doi: 10.1016/j.csl.2019.02.002, 2019.
- Neethling, A; Engelbrecht, L; Loos, B; Kinnear, C; Theart, R; Abrahams, S; Niesler, T; Mellick, G.D; Williams, M; Bardien, S.
Wild-type and mutant (G2019S) leucine-rich repeat kinase 2 (LRRK2) associate with subunits of the translocase of outer mitochondrial membrane (TOM) complex
Experimental cell research, vol. 375, no. 2, pp. 72-79, doi: 10.1016/j.yexcr.2018.12.022, 2019.
- van der Westhuizen, E; Niesler, T.R.
Synthesised bigrams using word embeddings for code-switched ASR of four South African language pairs.
Computer Speech and Language, vol. 54, pp. 151-17, doi: 10.1016/j.csl.2018.10.002, 2019.
2018
- Byker, R; Niesler, T.R.
Direction of Arrival Estimation of Wide-band Signals with Planar Microphone Arrays.
arXiv:1811.06756, 2018.
- Struwig, M.N; Wolhuter, R; Niesler, T.R.
Non-linear model and optimization method for a single-axis linear-motion energy harvester for footstep excitation.
Smart Materials and Structures, vol. 27, number 12, doi: 10.1088/1361-665X/aae6e7, 2018.
- Lerato, L; Niesler, T.R.
Feature Trajectory Dynamic Time Warping for Clustering of Speech Segments.
arXiv:1810.12722, 2018.
- Lerato, L; Niesler, T.R.
.Cluster Size Management in Multi-Stage Agglomerative Hierarchical Clustering of Acoustic Speech Segments.
arXiv:1810.12744, 2018.
- Theart, R; Loos, B; Powrie, Y; Niesler, T.R.
Improved region of interest selection and colocalization analysis in three-dimensional fluorescence microscopy samples using virtual reality.
PLoS ONE, vol. 13, number 8, e0201965. doi:10.1371/journal.pone.0201965, 2018.
- Biswas, A; van der Westhuizen, E; Niesler, T.R; de Wet, F.
Improving ASR for code-switched speech in under-resourced languages using out-of-domain data.
Proceedings of SLTU, Gurugram, India, August 2018.
- Menon, R; Biswas, A; Saeb, A; Quinn, J; Niesler, T.R.
Automatic Speech Recognition for Humanitarian Applications in Somali.
Proceedings of SLTU, Gurugram, India, August 2018.
- Menon, R; Kamper, H; Yilmaz, E; Quinn, J; Niesler, T.R.
ASR-free CNN-DTW keyword spotting using multilingual bottleneck features for almost zero-resource languages..
Proceedings of SLTU, Gurugram, India, August 2018.
- Biswas, A; de Wet, F; van der Westhuizen, E; Yilmaz, E; Niesler, T.R.
Multilingual Neural Network Acoustic Modelling for ASR of Under-Resourced English-isiZulu Code-Switched Speech.
Proceedings of Interspeech, Hyderabad, India, September 2018.
- Yilmaz, E; Biswas, A; van der Westhuizen, E; de Wet, F; Niesler, T.R.
Building a Unified Code-Switching ASR System for South African Languages.
Proceedings of Interspeech, Hyderabad, India, September 2018.
- Menon, R; Kamper, H; Quinn, J; Niesler, T.R.
Fast ASR-free and almost zero-resource keyword spotting using DTW and CNNs for humanitarian monitoring.
Proceedings of Interspeech, Hyderabad, India, September 2018.
- van der Westhuizen, E; Niesler, T.R.
A First South African Corpus of Multilingual Code-switched Soap Opera Speech.
Proceedings of the eleventh international conference on language resources and evaluation (LREC), Miyazaki, Japan, May 2018.
- Duckitt, W.D; Conradie, J.L; van Niekerk, M.J; Abraham, J.K; Niesler, T.R.
The design and implementation of a broadband digital low-level RF control system for the cyclotron accelerators at iThemba LABS.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , vol. 895, pp 1-9, doi: 10.1016/j.nima.2018.03.064, 2018.
- Botha, G.H.R; Theron, G; Warren, R; Klopper, M; Dheda, K; van Helden, P; Niesler, T.R.
Detection of tuberculosis by automatic cough sound analysis.
Physiological Measurement, vol. 39, number 4, doi: 10.1088/1361-6579/aab6d0, 2018.
- Dodson, S.C; Wiid, P.G; Niesler, T.R.
Design and adaptation of a folded split ring resonator antenna for use in an animal-borne sensor.
IOP Conference Series: Materials Science and Engineering, vol.321, number 1, doi: 10.1088/1757-899X/321/1/012007, 2018.
- le Roux, S.P; Wolhuter, R; Stevens, N; Niesler, T.R.
Reduced Energy and Memory Requirements by On-Board Behaviour Classification for Animal-Borne Sensor Applications.
IEEE Sensors Journal, vol. 18, number 10, doi: 10.1109/JSEN.2018.2816965, 2018.
2017
- le Roux, S.P; Marais, J; Wolhuter, R; Niesler, T.R.
Animal borne behaviour classification for sheep (Dohne Merino) and Rhinoceros (Ceratotherium simum and Diceros bicornis).
Animal Biotelemtetry, vol. 5, number 25, doi: 10.1186/s40317-017-0140-0, 2017.
- le Roux, S.P; Wolhuter, R; Niesler, T.R.
Energy benefits of on-board behaviour classification for animal-borne sensor applications.
Proceedings of IEEE Sensors, Glasgow, United Kingdom, October 2017.
- le Roux, S.P; Wolhuter, R; Niesler, T.R.
An Overview of Automatic Behaviour Classification for Animal-Borne Sensor Applications in South Africa.
Proceedings of the ACM Multimedia 2017 Workshop on South African Academic Participation (SAWACMMM), Mountain View, California, USA, doi: 10.1145/3132711.3132716, 2017.
- Wotherspoon, J; Wolhuter, R; Niesler, T.R.
Choosing an integrated radio-frequency module for a wildlife monitoring wireless sensor network.
Proceedings of IEEE Africon, Cape Town, South Africa, September 2017.
- Dodson,S.C.K; Wiid, P.G; Niesler, T.R.
Design of a Folded Split Ring Resonator Antenna for Use in an Animal-Borne Sensor.
Proceedings of IEEE Radio, Cape Town, South Africa, September 2017.
- van der Westhuizen, E; Niesler, T.R.
Synthesising isiZulu-English code-switch bigrams using word embeddings.
Proceedings of Interspeech, Stockholm, Sweden, August 2017.
- Saeb, A; Menon, R; Cameron, H; Kibira, W; Quinn, J; Niesler, T.R.
Very low resource radio browsing for agile developmental and humanitarian monitoring.
Proceedings of Interspeech, Stockholm, Sweden, August 2017.
- Menon, R; Saeb, A; Cameron, H; Kibira, W; Quinn, J; Niesler, T.R.
Radio-browsing for Developmental Monitoring in Uganda.
Proceedings of the 42nd IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), New Orleans, USA, March 2017. ISBN: 978-1-5090-4116-9.
2016
- Theart, R; Loos, B; Niesler, T.R.
Virtual reality assisted microscopy data visualization and colocalization analysis.
BMC Bioinformatics, vol. 18, number 2, pp.64-79, doi: 10.1186/s12859-016-1446-2, 2016.
- Wolfaardt, C.J; Davidson, D.B; Niesler, T.R.
Statistical classification of radio frequency interference (RFI) in a radio astronomy environment.
Proceedings of the Pattern Recognition Association of South Africa and Robotics and Mechatronics International Conference (PRASA-RobMech), Stellenbosch, South Africa, 2016. ISBN: 978-1-5090-3335-5.
- van der Westhuizen, E; Niesler, T.R.
The Effect of Postlexical Deletion on Automatic Speech Recognition in Fast Spontaneously Spoken Zulu.
Proceedings of Interspeech, San Fransisco, USA, 2016. ISSN 2308-457X.
- van der Westhuizen, E; Niesler, T.R.
Automatic Speech Recognition of English-isiZulu Code-switched Speech from South African Soap Operas.
Proceedings of the fifth Workshop on Spoken Language Technology for Under-resourced Languages (SLTU), Yogyakarta, Indonesia, 2016.
- Agenbag, W; Niesler, T.R.
Refining sparse coding sub-word unit inventories with lattice-constrained Viterbi training.
Proceedings of the fifth Workshop on Spoken Language Technology for Under-resourced Languages (SLTU), Yogyakarta, Indonesia, 2016.
2015
- Lerato, L; Niesler, T.R.
Clustering acoustic segments using multi-stage agglomerative hierarchical clustering.
PLoS ONE, vol. 10, number 10, e0141756. doi:10.1371/journal.pone.0141756, 2015.
- Rademan, C.F; Niesler, T.R.
Improved Visual Speech Synthesis using Dynamic Viseme k-means Clustering and Decision Trees.
Proceedings of the first Joint Conference on Facial Analysis, Animation and Auditory-Visual Speech Processing (FAAVSP), Vienna, Austria, 2015.
- Agenbag, W; Niesler, T.R.
Automatic segmentation and clustering of speech using sparse coding and metaheuristic search.
Proceedings of Interspeech, Dresden, Germany, 2015.
- van Vuuren, V.Z; ten Bosch, L.F.M; Niesler, T.R.
Unconstrained Speech Segmentation using Deep Neural Networks.
Proceedings of the 4th International Conference on Pattern Recognition Application and Methods (ICPRAM), Lisbon, Portugal, 2015. ISBN 978-989-758-076-5.
2014
- Kamper, H; de Wet, F; Hain, T; Niesler, T.R.
Capitalising on North American speech resources for the development of a South African English large vocabulary speech recognition system.
Computer Speech and Language, vol. 28, issue 6, pp. 1255-1268, 2014.
- Kamper, H; Niesler, T.R.
The impact of accent identification errors on speech recognition of South African English.
South African Journal of Science, vol. 110, no. 1/2, pp. 1-6, 2014.
- Agenbag, W; Smit, W; Niesler, T.R. Automatic Segmentation and Clustering of Speech using Sparse Coding.
Proceedings of the twenty-fifth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Cape Town, South Africa, 2014. ISBN 978-0-620-62617-0.
- Marais, J; le Roux, S.P; Wolhuter, R; Niesler, T.R. Automatic classification of sheep behaviour using 3-axis accelerometer data.
Proceedings of the twenty-fifth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Cape Town, South Africa, 2014. ISBN 978-0-620-62617-0.
- Mohasi, L; Secujski, M; Mak, R; Niesler, T.R. A Comparison of two prosody modelling approaches for Sesotho and Serbian.
Proceedings of the 16th International Conference on Speech and Computer (SPECOM), Novi Sad, Serbia, 2014.
- Mohasi, L; Mixdorf, H; Niesler, T.R. Perceptual evaluation of the effect of mismatched Fujisaki model commands and surface tone in Sesotho.
Proceedings of Speech Prosody 7, Dublin, Ireland, 2014.
2013
- Henselmans, D; van Leeuwen, D; Niesler, T.R. Baseline Speech Recognition of South African Languages using Lwazi and AST.
Proceedings of the twenty-fourth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Johannesburg, South Africa, 2013. ISBN 978-0-86970-771-5.
- Henselmans, D; van Leeuwen, D; Niesler, T.R. Phoneme- and Word-based Language Identification of South African Languages using Lwazi
.
Proceedings of the twenty-fourth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Johannesburg, South Africa, 2013. ISBN 978-0-86970-771-5.
- van Vuuren, VZ; ten Bosch, L; Niesler, T.R. A Dynamic Programming Framework for Neural Network-Based Automatic Speech Segmentation.
Proceedings of Interspeech, Lyon, France, 2013. ISSN 2308-457X.
2012
- de Villiers, H.A.C; van Zijl, L; Niesler, T.R.
Vision-based hand pose estimation through similarity search using the Earth Mover's Distance.
IET Computer Vision, vol. 6, issue 4, pp. 285-295, 2012.
- de Wet, F; Niesler, T.R; van der Walt, C.
The relationship between the automatic assessment of oral proficiency and other indicators of first year student's linguistic abilities.
Language Science and Language Technology in Africa: A Festschrift for Justus C, Roux. Ndinga-Koumba-Binza, H,S and Bosch, S.E. (eds). SUN Press, pp. 309-326, 2012. ISBN 978-1-920338-79-4.
- Kamper, H; Muamba Mukanya, F.J; Niesler, T.R.
Multi-accent acoustic modelling of South African English.
Speech Communication, vol. 54, no. 6, pp. 801-813, 2012.
- van Vuuren, VZ; ten Bosch, L; Niesler, T.R. Automatic segmentation of TIMIT by dynamic programming. Proceedings of the twenty-third annual symposium of the Pattern
Recognition Association of South Africa (PRASA), Pretoria, 2012. ISBN 978-0-620-54601-0.
- Kamper, H; Niesler, TR. Optimisation of acoustic models for a target accent using decision-tree state clustering. Proceedings of the twenty-third annual symposium of the Pattern
Recognition Association of South Africa (PRASA), Pretoria, 2012. ISBN 978-0-620-54601-0.
- Lerato, L; Niesler, TR. Investigating parameters for unsupervised clustering of speech segments using TIMIT. Proceedings of the twenty-third annual symposium of the Pattern
Recognition Association of South Africa (PRASA), Pretoria, 2012. ISBN 978-0-620-54601-0.
- Mohasi, L; Mixdorff, H.J; Niesler, T.R; Zerbian, S.
Analysis of Sesotho tone using the Fujisaki model,
Proceedings of the 3rd international Symposium on Tonal Aspects of languages (TAL), Nanjing, China, 2012.
- Kamper, H; de Wet, F; Hain,; Niesler, T.R.
Automatic transcription of South African broadcast news.
Proceedings of the third International Workshop on Spoken Languages Technologies for Under-resourced Languages (SLTU), Cape Town, 2012. ; ISBN ; 978-1-86822-615-3.
2011
- Loots, L; Niesler, T.R;
Automatic conversion between pronunciations of different English accents.
Speech Communication, volume 53, ; no. 1, pp. 75-84, 2011.
- Kamper, H; Niesler, T.R. Accent reclassification and speech
recognition of Afrikaans, Black and White South African English,
Proceedings of the twenty-second annual symposium of the Pattern Recognition Association of South Africa (PRASA), Johannesburg, 2011. ISBN 978-0-620-51914-4.
- de Wet, F; Muller, P; van der Walt, C; Niesler, T.R.
Readability index as a design criterion for elicited imitation tasks in automatic oral proficiency assessment.
ISCA Workshop on Speech and Language Technology in Education (SLaTE), Venice, Italy, 2011.
- Mixdorff, H; Mohasi, L; Machobane, M; Niesler, T.R.
A Study on the Perception of Tone and Intonation in Sesotho,
Proceedings of Interspeech, Florence, Italy, August 2011. ISSN 1990-9772.
- Kamper, H; Niesler, T.R.
Multi-accent speech recognition of Afrikaans, Black and White varieties of South African English,
Proceedings of Interspeech, Florence, Italy, August 2011. ISSN 1990-9772.
- Mohasi, L; ; Mixdorff, H; ; Niesler, T.R.
An acoustic analysis of tone in Sesotho,
Proceedings of the 17th International Congress of Phonetic Sciences (ICPhS), Hong Kong, 2011
2010
- de Villiers, H.A.C; Niesler, T.R; van Zijl, L.
Balancing Runtime Space- and Time Complexity in Synthetic Database Driven Hand Posture Reconstruction Systems,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2010. ; ISBN 978-0-7992-2470-2.
- de Wet, F; Muller, P; van der Walt, C; Niesler, T.R.
Segmentation and accuracy-based scores for the automatic assessment of oral proficiency for proficient L2 speakers,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2010. ISBN 978-0-7992-2470-2.
- Goussard, G.W; Niesler, T.R.
Automatic discovery of subword units and pronunciations for automatic speech recognition using TIMIT,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South
Africa, November 2010. ISBN 978-0-7992-2470-2.
- Kamper, H; Muamba Mukanya, F; ; Niesler, T.R.
Acoustic modelling of English-accented and Afrikaans-accented South African English,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch,
South Africa, November 2010. ISBN 978-0-7992-2470-2.
- Loots, L; de Wet, F; Niesler, T.R.
Extending an Afrikaans pronunciation dictionary using Dutch resources and P2P/GP2P,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South
Africa, November 2010. ISBN 978-0-7992-2470-2.
- Loots, L; Niesler, T.R.
Comparing direct G2P with G2P followed by accent conversion when determining pronunciations for South African
English,
Proceedings of the twenty-first annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch,
South Africa, November 2010. ISBN 978-0-7992-2470-2.
2009
- Burchell, J.J; Aldrich, C; Eksteen, J.J; Niesler, T.R; Jemwa, G.T.
Acoustic Monitoring of Plasma Arcs in Direct Current Electric Arc Furnaces.
Metallurgical and Materials Transactions B, volume 40, issue 6, pp. 886-891, 2009
- Niesler, T.R; De Wet, F.
The effect of code-mixing on accent identification accuracy.
Computer Speech and Language, volume 23, pp. 435-443, 2009.
- De Wet, F; Van der Walt, C; Niesler, T.R.
Automatic assessment of oral language proficiency and listening comprehension.
Speech Communication, volume 51, pp. 864-874, 2009.
- Loots, L; Davel, M; Barnard, E; Niesler, T.R. ;
Comparing manually-developed and data-driven rules for P2P learning.
Proceedings of the Twentieth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South
Africa, November 2009. ISBN 978-0-7992-2356-9.
- Kamper, H; Niesler, T.R.
Characterisation and simulation of telephone channels using the TIMIT and NTIMIT databases.
Proceedings of the Twentieth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South
Africa, November 2009. ISBN 978-0-7992-2356-9.
- Loots, L; Niesler, T.R.
Data-driven Phonetic Comparison and Conversion between South African, British and American English Pronunciations.
Proceedings of Interspeech, Brighton, UK, ; September 2009. ISSN 1990-9772.
- Muller, P; De Wet, F; van der Walt, C; Niesler, T.R.
Automatically assessing the oral proficiency of proficient L2 speakers.
Proceedings of the ISCA Workshop on Speech and Language Technology in Education (SLaTE), Warwickshire, UK, 2009.
2008
- Krige, W; Herbst, T; Niesler, T.R;
Explicit transition modelling for automatic singing transcription.
Journal of New Music Research, vol. 37, no 4, pp. 311-324, 2008.
- Van der Walt, C; De Wet, F; Niesler, T.R;
Oral proficiency assessment: the use of automatic speech recognition systems.
Southern African Linguistics and Applied Language Studies, vol. 26, no 1, pp. 135-146, 2008.
- De Wet, F; Muller, P; van der Walt, C; ;Niesler, T.R.
Experiments in automatic assessment of oral proficiency and listening comprehension for bilingual South African speakers of English.
Proceedings of the Nineteenth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Cape Town, South Africa, November 2008. ; ISBN 978-0-7992-2350-7.
- Niesler, T; de Wet, F;
Accent identification in the presence of code-mixing.
Proceedeings of the Odyssey 2008 Speaker and Language Recognition Workshop, Stellenbosch, South Africa, January 2008. ISBN 978-0-620-40331-3.
2007
- Klompje, G; Niesler, T.R;
A monophone speech generation system.
SAIEE Africa Research Journal, vol 98, no 4, pp. 115-123, 2007.
- De Wet, F; Louw, P.H; Niesler, T.R;
Human and automatic accent identification of Nguni and Sotho Black South African English.
South African Journal of Science, vol. 103, no. 3/4, pp. 159-164, 2007.
- Niesler, T.R;
Language-dependent state clustering for multilingual acoustic modelling.
Speech Communication, vol. 49, no. 6, pp. 453-463, 2007. (doi:10.1016/j.specom.2007.04.001)
- De Wet, F; Van der Walt, C; Niesler, T.R;
Automatic large-scale oral language proficiency assessment.
Proceedings of the eighth annual conference of the International Speech Communication Association (Interspeech), Antwerp, Belgium, August 2007, pp. 218-221. ISSN 1990-9772.
2006
- De Klerk, V; Adendorff, R; De Vos, M; Hunt, S; Simango, R; Todd, L; Niesler, T;
Educated mother-tongue South African English: A corpus approach.
Language Matters, vol. 37, No. 2, pp. 206-226, 2006.
- Burchell, J.J; Eksteen, J.J; Niesler, T.R; Aldrich, C;
Development of an acoustic sensor for electric arc furnaces.
Chemical Technology, pp. 8-9, December 2006.
- Duckitt, W.D; Tuomi, S.K; Niesler, T.R;
Automatic detection, segmentation and assessment of snoring from ambient acoustic data
Physiological Measurement, vol. 27, pp. 1047-1056, 2006.
- Klompje, G; Niesler, T.R;
A parametric monophone speech synthesis system.
Proceedings of the seventeenth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Parys, South Africa, November 2006. ;ISBN 0-6203-7384-9.
- Krige, W.A; Niesler, T.R;
An HMM Based Singing Transcription System.
Proceedings of the seventeenth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Parys, South Africa, November 2006. ;ISBN 0-6203-7384-9.
- De Wet, F; Louw, P.H; Niesler, T.R; ;
The design, collection and annotation of speech databases in South Africa.
Proceedings of the seventeenth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Parys, South Africa, November 2006. ;ISBN 0-6203-7384-9.
- De Wet, F; Niesler, T.R; Louw, P.H;
Nguni and Sotho varieties of South African English - distant cousins or twins?
Proceedings of the ISCA Tutorial and Research Workshop (ITRW) on Multilingual Speech and Language Processing (MULTILING-2006), 9-11 April, Stellenbosch, South
Africa.
- Niesler, T.R; Willett, D;
Language identification and multilingual speech recognition using discriminatively trained acoustic models.
Proceedings of the ISCA Tutorial and Research Workshop (ITRW) on Multilingual Speech and Language Processing (MULTILING-2006), 9-11 April, Stellenbosch, South
Africa.
- Niesler, T.R;
Language-dependent state clustering for multilingual speech recognition in Afrikaans, South African English, Xhosa and Zulu.
Proceedings of the ISCA Tutorial and Research Workshop (ITRW) on Multilingual Speech and Language Processing (MULTILING-2006), 9-11 April, Stellenbosch, South Africa.
2005
- Malaza, T; Matins, L; Roux, J.C; Niesler, T.R.
Porting an English Spoken Dialogue System to Xhosa and Zulu.
South African Journal of African Languages, vol. 25, no. 2, pp. 101-110, 2005.
- Niesler, T.R; Louw, P.H; Roux, J.C;
Phonetic analysis of Afrikaans, English, Xhosa and Zulu using South African speech databases
Southern African Linguistics and Applied Language Studies, vol. 23, no 4, pp. 459-474, 2005.
- Tait, M; Visagie, A; Niesler, T.R;
Development of a spoken dialogue system operating in Afrikaans, South African English and Xhosa,
Transactions of the SAIEE, vol. 96, no. 3, pp. 224-233, September 2005.
- Muller, J.J; Niesler, T.R;
Development of a USB Telephony Interface Device for Speech Recognition Applications.
Proceedings of the Southern African Telecommunications Networks and Applications Conference (SATNAC), Central Drakensberg, KwaZulu-Natal, South Africa, September 2005. ISBN 0-6203-4908-5.
2004
- Niesler, T.R; Louw, P.H;
Comparative phonetic analysis and phoneme recognition for Afrikaans, English and Xhosa using the African Speech Technology telephone speech databases ,
South African Computer Journal, no. 32, pp. 3-12, June 2004.
- Roux, J.C; Louw, P.H; Niesler, T.R;
The African Speech Technology Project: An Assessment.
Proceedings of the fourth international conference on language resources and evaluation (LREC), Lisbon, May 2004, pp. 93-96. ISBN 2-9517-4081-6.
2003
- Niesler, T.R; Willett, D;
Unsupervised adaptation of statistical language models for speech recognition,
South African Computer Journal, no. 30, pp. 52-59, July 2003.
- Willett, D; Niesler, T.R; McDermott, E; Minami, Y; Katagiri, Y;
Pervasive unsupervised adaptation for lecture speech transcription.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Hong Kong, March 2003, pp. 292-295. ISBN 0-7803-7664-1.
2002
- Niesler, T.R; Willett, D;
Unsupervised language model adaptation for lecture speech transcription.
Proceedings of the Seventh International Conference on Spoken Language Processing (ICSLP), Denver, September 2002, pp. 1413-1416. ISBN 1-8763-4640-X.
2001
- Niesler, T.R; Roux, J.C;
Natural language understanding in the DACST-AST dialogue system. ;
Proceedings of the twelfth annual symposium of the Pattern Recognition Association of South Africa (PRASA), Franchhoek, November
2001, pp. 134-136. ISBN 1-8685-4417-6.
1999
- Niesler, T.R; Woodland, P.C;
Variable-length category-based statistical language models,
Computer, Speech and Language, vol. 13, pp. 99-124, January 1999.
- Woodland, P.C; Odell, J.J; Hain, T; Moore, G.L; Niesler,T.R; Tuerk, A; Whittaker, E.W.D.
Improvements in accuracy and speed in the HTK Broadcast News transcription system ,
Proceedings of Eurospeech, Budapest, Hungary, September 1999, pp. 1043-1046. ISSN 1018-4074.
- Hain, T; Woodland, P.C; Niesler, T.R; Whittaker, E.W.D.
The 1998 HTK System for Transcription of Conversational Telephone Speech ,
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Phoenix, Arizona, March 1999, pp. 57-60. ISBN 1-8763-4619-1.
- Woodland, P.C; Hain, T; Moore, G.L; Niesler, T.R; Povey, D; Tuerk, A; Whittaker, E.W.D.
The 1998 HTK Broadcast News transcription system: development and results ,
Proceedings of the 1999 DARPA Broadcast News Workshop, Hendon, Virginia, Feburary 1999, pp. 265-270. ISBN 1-5586-0638-6.
1998
- Niesler, T.R; Whittaker, E.W.D; Woodland, P.C;
Comparison of part-of-speech and automatically derived category-based language models for speech recognition.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seattle, May 1998, pp. 177-180. ISBN 0-8763-4610-8.
- Woodland, P.C; Hain, T; Johnson, S.E; Niesler, T.R; Tuerk, A; Young, S.J.
Experiments in Broadcast News Transcription ,
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seattle, May 1998, pp. 909-912. ISBN 0-8763-4610-8.
- Woodland, P.C; Hain, T; Johnson, S.E; Niesler, T.R; Tuerk, A; Whittaker, E.W.D; Young, S.J. ;
The 1997 HTK Broadcast News Transcription System ,
Broadcast News Transcription and Understanding Workshop, Lansdowne, Virginia, February 1998. ISBN 1-5586-0564-9.
1997
- Niesler, T.R; Woodland, P.C;
Modelling word-pair relations in a category-based language model.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Munich, April 1997, pp. 795-798. ;ISBN 0-6463-1303-7.
1996
- Niesler, T.R; Woodland, P.C;
Combination of word-based and category-based language models.
Proceedings of the Fourth International Conference on Spoken Language Processing (ICSLP), Philadelphia, October 1996, ;pp. 220-223. ISBN 0-7803-3555-4.
- Niesler, T.R; Woodland, P.C;
A variable-length category-based n-gram language model.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Atlanta, April 1996, pp. 164-167. ISBN 0-7803-3193-1.
1995
- Niesler, T.R; Du Plessis, J.J;
Time-optimal control by means of neural networks,
IEEE Control Systems Magazine, October 1995, pp. 23-33.
