| 2008 | IGARSS | Construction of an Image Quality Assessment Model for Use on Board an Leo Satellite. | Izak van Zyl Marais, Willem Herman Steyn, Johan A. du Preez |
| 2005 | ICDAR | Estimating the Pen Trajectories of Multi-Path Static Scripts Using Hidden Markov Models. | Emli-Mari Nel, Johan A. du Preez, Ben M. Herbst |
| 2003 | ICASSP | Automatic syllabification using hierarchical hidden Markov models. | Pieter Nel, Johan A. du Preez |
| 2001 | Interspeech | Phoneme-based topic spotting on the switchboard corpus. | M. W. Theunissen, Konrad Scheffler, Johan A. du Preez |
| 2000 | Interspeech | Efficient mixed-order hidden Markov model inference. | Ludwig Schwardt, Johan A. du Preez |
| 2000 | Interspeech | Automatic language identification using mixed-order HMMs and untranscribed corpora. | Ludwig Schwardt, Johan A. du Preez |
| 2000 | LREC | Developing a Multilingual Telephone Based Information System in African Languages. | Justus C. Roux, Elizabeth C. Botha, Johan A. du Preez |
| 1998 | Interspeech | Efficient high-order hidden Markov modelling. | Johan A. du Preez, David M. Weber |
| 1998 | Interspeech | Automatic language recognition using high-order HMMs. | Johan A. du Preez, David M. Weber |
| 1992 | ICASSP | The automatic recognition of stop consonants using hidden Markov models. | T. Waardenburg, Johan A. du Preez, M. W. Coetzer |