1. Bang & Olufsen a/s, Bang & Olufsen Allé 1, Struer, DK-7600, Denmark
2. Department of Computer Science, Aalto University, P.O. Box 13000, FI-00076 Aalto, Finland
3. Department of Electrical Engineering (ESAT-STADIUS/ETC), KU Leuven, Kasteelpark Arenberg 10, 3001 Leuven, Belgium
4. Department of Electronic Systems, Aalborg University, 9220 Aalborg, Denmark