(19)

(11)

EP 1 875 461 A1

(12)

(43) Date of publication: 09.01.2008 Bulletin 2008/02 (21) Application number: 06733033.2 (22) Date of filing: 28.04.2006

(51) International Patent Classification (IPC):  G10K 11/172(2006.01) (86) International application number: PCT/NL2006/000228 (87) International publication number: WO 2006/118443 (09.11.2006 Gazette 2006/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 29.04.2005 NL 1028909 (71) Applicant: UNIVERSITEIT TWENTE 7522 NB Enschede (NL)	(72) Inventors: YSBRAND, Hans Wijnant NL-7522 NB Enschede (NL) HANNINK, Marieke Henriëtte Cathrien NL-7521 DZ Enschede (NL) VLASMA, Jacob Piet, P/a Universiteit Twente NL-7522 NB Enschede (NL) (74) Representative: Grootscholten, Johannes A.M. et al Arnold & Siedsma Sweelinckplein 1 2517 GK Den Haag 2517 GK Den Haag (NL)