Johan A. du Preez

Stellenbosch University — South Africa

Computer Science · Physical Sciences

14h-index1.2kcitations88works0.02yr avg
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Research Topics

Speech Recognition and Synthesis(25), Natural Language Processing Techniques(18), Speech and Audio Processing(17), Music and Audio Processing(11), Handwritten Text Recognition Techniques(7)

Publications87 total

Detecting and classifying blue whale calls with wavelet scattering and spectral entropy
The Journal of the Acoustical Society of America·2025
Low-density parity-check codes: tracking non-stationary channel noise using sequential variational Bayesian estimates
Telecommunication Systems·2023· 1 citedOpen Access
On the link between generative semi-supervised learning and generative open-set recognition
Scientific African·2023· 2 citedOpen Access
Detection of cetacean and fish sounds using normalized summation of harmonics and spectrogram masking
JASA Express Letters·2023· 2 citedOpen Access
On the link between generative semi-supervised learning and generative open-set recognition
arXiv (Cornell University)·2023Open Access
Soft-output signal detection for cetacean vocalizations using spectral entropy, k-means clustering and the continuous wavelet transform
Ecological Informatics·2023· 17 cited
IMPROVING DEEP-LEVEL MINE UTILITY USAGE THROUGH DYNAMIC BASELINES
2023· 1 cited
Soft-Output Signal Detection for Cetacean Vocalizations Using Spectral Entropy, K-Means Clustering and the Continuous Wavelet Transform
arXiv (Cornell University)·2022Open Access
SimLDA: A Tool for Topic Model Evaluation
Lecture notes in networks and systems·2022· 1 cited
A Temporal Extension of Latent Dirichlet Allocation for Unsupervised Acoustic Unit Discovery
Interspeech 2022·2022· 1 cited
Rail break and derailment prediction using Probabilistic Graphical Modelling
arXiv (Cornell University)·2022Open Access
SimLDA: A tool for topic model evaluation
arXiv (Cornell University)·2022Open Access
A Temporal Extension of Latent Dirichlet Allocation for Unsupervised Acoustic Unit Discovery
arXiv (Cornell University)·2022· 1 citedOpen Access
Efficient approximations of the multi-sensor labelled multi-Bernoulli filter
Signal Processing·2022Open Access
Temporal separation of whale vocalizations from background oceanic noise using a power calculation
Ecological Informatics·2022· 6 citedOpen Access
Degenerate Gaussian factors for probabilistic inference
International Journal of Approximate Reasoning·2022Open Access
ALBU: An Approximate Loopy Belief Message Passing Algorithm for LDA for Small Data Sets
Lecture notes in networks and systems·2022
Automated feature-specific tree species identification from natural images using deep semi-supervised learning
Ecological Informatics·2021Open Access
A derivation of variational message passing (VMP) for latent Dirichlet allocation (LDA)
arXiv (Cornell University)·2021Open Access
Variational message passing (VMP) applied to LDA.
arXiv (Cornell University)·2021Open Access
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Frequent Co-authors

B. M. Herbst(6), David M. Weber(5), Emli-Mari Nel(4), D.J.J. Versfeld(3), L. C. Schwardt(3), Simon Streicher(3), Niko Brümmer(2), Johannes Coetzer(2), Izak van Zyl Marais(2), Willem H. Steyn(2), Emile-Reyn Engelbrecht(2), Jacques van Wyk(2), D. E. Goszczynski(1), Johan Burger(1), J Dreijer(1), Ben Herbst(1), M. W. Rademan(1), Justus C. Roux(1), Elizabeth C. Botha(1), Herman A. Engelbrecht(1)