Publications

Charl van Heerden

Conference papers/proceedings

E. Barnard, M.A. Cho, P. Debba, R. Mathieu, K. Wessels, C. van Heerden, C. van der Walt, G.P. Asner, "Optimizing tree-species classification in hyperspectal images," in Proceedings of the 21st Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2010, pp. 33-37.

E. Barnard, J. Schalkwyk, C. van Heerden and P.J. Moreno, "Voice search for development," in Proceedings of the 11th Annual Conference of the International Speech Communication Association (Interspeech), Makuhari, Japan, September 2010, pp. 282-285.

C.J. van Heerden and E. Barnard, "Towards understanding the influence of SVM hyperparameters," in Proceedings of the 21st Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2010, pp. 281-286.

C. van Heerden, E. Barnard, M. Davel, C. van der Walt, E. van Dyk, M. Feld and C. Müller, "Combining regression and classification methods for improving automatic speaker age recognition," in Proceedings of the International Conference on Acoustics and Signal Processing (ICASSP), Dallas, Texas, March 2010, pp. 5174-5177.

C. van Heerden, N. Kleynhans, E. Barnard and M. Davel, "Pooling ASR data for closely related languages," in Proceedings of the Workshop on Spoken Languages Technologies for Under-Resourced Languages (SLTU 2010), Penang, Malaysia, May 2010, pp. 17-23.

J. Badenhorst, C. van Heerden, M. Davel and E. Barnard, "Collecting and evaluating speech recognition corpora for nine southern Bantu languages," in Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics (EACL), Athens, Greece, March 2009, pp. 1-8.

E. Barnard, M. Davel and C. van Heerden, "ASR Corpus design for resource-scarce languages," in Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech), Brighton, United Kingdom, September 2009, pp. 2847-2850.

E. Barnard, C. van der Walt, M. Davel, C. van Heerden, F. Senekal and T. Naidoo, "Learning structured representations of data," in Proceedings of the 20th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2009, pp. 1-6.

M. Feld, E. Barnard, C. van Heerden and C. Müller, "Multilingual speaker age recognition: Regression analyses on the Lwazi corpus," in Proceedings of the IEEE Workshop on Automatic Speech Recognition and Understanding (ASRU), Merano, Italy, December 2009, pp. 534-549.

C. van Heerden and E. Barnard, "Combining multiple classifiers for age classification," in Proceedings of the 20th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Stellenbosch, South Africa, November 2009, pp. 54-59.

C. van Heerden, E. Barnard and M. Davel, "Basic speech recognition for spoken dialogues," in Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech), Brighton, United Kingdom, September 2009, pp. 3003-3006.

C. van Heerden, J. Schalkwyk and B. Strope, "Language modelling for what-with-where on GOOG-411," in Proceedings of the 10th Annual Conference of the International Speech Communication Association (Interspeech), Brighton, United Kingdom, September 2009, pp. 991-994.

C.J. van Heerden and E. Barnard, "Speaker-specific variability of phoneme durations," in Proceedings of the 18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Pietermaritzburg, South Africa, November 2007, pp. 111-114.

C.J. van Heerden and E. Barnard, "Speech rate normalization used to improve speaker verification," SAIEE Africa Research Journal, vol. 98, no. 4, pp. 129-135, December 2007.

C.J. van Heerden and E. Barnard, "Speech rate normalization used to improve speaker verification," in Proceedings of the 17th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Parys, South Africa, November 2006, pp. 2-7.

C.J. van Heerden and E. Barnard, "Using timing information in speaker verification," in Proceedings of the 16th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Langebaan, South Africa, November 2005, pp. 53-57.

Journal articles

C.J. van Heerden and E. Barnard, "Speaker-specific variability of phoneme durations," South African Computer Journal (SACJ), vol. 40, pp. 44-50, June 2008.

Book / Book chapter

C.J. van Heerden and E. Barnard, "Durations of context-dependent phonemes: a new feature in speaker verification," Speaker Classification II, Springer, 2007, pp. 93-103.