Lighting device and receiver

摘要

There is provided a method and corresponding lighting device (100), and a receiver, which employs code modulation which provides a compatibility of code modulation in a dimmable lighting system. The lighting device comprises means for dimming the output light (102), which employs multiple dimming modes, each representing dimming the light output from lighting device by means of a respective dimming method, and means for embedding a code in the light output (103). The means for embedding a code in the light output employs code modulation which is based on controlling the instantaneous dimmed light output from the lighting device such that the integrated value of the dimmed light output during a time period T is modulated to embed the code. The code may then subsequently be extracted from the modulated light by means of an integrate-and-dump process at a receiver, without knowledge of the dimming method and/or dimming level of the lighting device.

主权项

1. A lighting device comprising:
at least one light source for providing a light output, a dimming component for providing dimming of said light output using a present dimming mode selected from a multiple of dimming modes, wherein each dimming mode is associated with a respective predetermined dimming method from a multiple of different dimming methods employable by the lighting device, and an embedding component for embedding a code in said dimmed light output with a modulation method selected from a plurality of modulation methods, said embedding component configured to control the instantaneous dimmed light output such that the integrated value of said dimmed light output during a time period T is modulated to embed said code and is configured to be demodulated by a receiver without a-priori knowledge of the dimming method selected, wherein the modulation method is selected according to the dimming method associated with the present dimming mode.