<p>A method for driving a lamp (2) comprises the steps of: generating a lamp current (ICONST) having a constant magnitude; defining a commutation period having a duration TCOMM; defining a time base of original commutation moments, having fixed mutual intervals of 0.5*TCOMM; receiving data to be embedded in the light output; commutating the lamp current at commutation moments; wherein individual commutations are time-modulated in order to encode said received data. Preferably, a commutation moment is: either equal to an original commutation moment if there are no data to embed; or advanced over a modulation distance (&Dgr;) with respect to the corresponding original commutation moment in order to encode data having a first value (“0”); or delayed over said modulation distance (&Dgr;) with respect to the corresponding original commutation moment in order to encode data having a second value (“1”).</p>
申请公布号
EP2449857(B1)
申请公布日期
2013.04.03
申请号
EP20100702916
申请日期
2010.01.07
申请人
KONINKLIJKE PHILIPS ELECTRONICS N.V.
发明人
SCHENK, TIM, C., W.;COLAK, SEL, B.;WERNARS, JOHANNES, P.;LINNARTZ, JOHAN, P., M., G.;FERI, LORENZO;DAMINK, PAULUS, H., A.;PENNING DE VRIES, HENDRICUS, T., G., M.