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- Christian Wellekens received the degree of Ingénieur Civil Electricien Mécanicien from the University of Louvain, Belgium in 1965 and the Ph.D. from the Ecole Polytechnique Fédérale de Lausanne, Switzerland in 1974.
- Since his retirement, he studies for a Master in Philosophy at the University of Louvain (graduation planned in 2011).
- He worked for MBLE Research Labs (Philips development) from 1965-68 where he developed microwave power amplifiers.
- In 1968, he joined the Philips Research Laboratory (PRLB) where he stayed till March 1991. He worked successively on the mathematical approximation of specifications of analog and digital filters, on piezoelectric transducer modeling and on speech recognition.
- He spent a sabbatical year (1989-1990) at Bellcore (Bell Communications Research), Morristown, N.J USA. His main contributions were in circuit theory, signal processing, speech recognition, connectionist networks and applied mathematics.
- From March 1991 to September 1992, he was a Scientific Advisor for Speech Recognition at Lernout & Hauspie Speech Products (Belgium) where he contributed to the development of industrial speech recognizers using stochastic models as well as neural networks.
- He co-authored the paper winning the ISCA 2009 best paper award at the interspeech conference in Brighton, « Automatic speech recognition and speech variability: a review » published in the "Speech communication journal", Sept. 10, 2009.
- In 2005, he received the Christoffel Plantin Award (Belgium) as an outstanding Belgian personality working abroad.