| 摘要 |
A lighting system comprises a plurality of separate lamps (1). Each lamp comprises a light control means which is arranged to adjust lighting properties of the lamp, an ultrasonic transmitter arranged to transmit ultrasonic signals, an ultrasonic receiver arranged to receive reflected ultrasonic signals, and a processing means arranged to derive a time-of-flight signal representing the time differences between the transmitted and received ultrasonic signals and to send control signals to the light control means in dependence of the time-of-flight signal for adapting the lighting properties of the lamp. The light control means are arranged such that the control signals can be coded into the transmitted ultrasonic signals and such that the control signals can be retrieved from the ultrasonic signals received from other lamps in the system, in order to communicate control signals between the lamps in the system. The light beam (4) of each lamp follows a person (51) walking on the floor (53). |
