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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 obtained in 2013 a Master in philosophy at the Catholic university of Louvain. Specializing in German idealism, he works on a doctoral thesis on "Freedom and State".
- He worked for MBLE Research Labs (Philips development) from 1965-68 where he developed solid-state microwave power amplifiers for Hertzian communications.
- 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, mathematical model of a ultrasonic piezoelectric transducer for medical echography.
- 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.