The invention relates to a device and to a method for synchronising a light wave with an electronic signal comprising images that are made of interleaved frames, characterised in that said method comprises the following steps: the reception (20) of the electronic signal by a box； the extraction (13) of first information by the identification of even and odd frames restored by the signal； the processing (14) said first information from the detection of even and odd images restored by the electronic signal； the calculation (15) from a logical operation carried out on the basis of the odd frames and odd images thus obtained； and the transmission (21) of a command to a light source supply module based on the results of said calculation.
