Patent ID: 9608725
Date: 2017-03-28
CPC Classifications: H04B,H04M

Claim:
1. A computer-implemented method comprising: determining a plurality of luminance change frequencies of a light emitter by coding a plurality of transmission information sources, the light emitter transmitting the plurality of transmission information sources by a change in luminance according to each of the plurality of luminance change frequencies; outputting a signal, which controls the change in luminance of the light emitter according to each of the plurality of luminance change frequencies, to the light emitter, wherein, in the determining, the plurality of luminance change frequencies include a first frequency and a second frequency which is different from the first frequency, in the outputting, a signal of the first frequency and a signal of the second frequency respectively causes the light emitter to change in luminance according to the first frequency during a first time period and to change in luminance according to the second frequency during a second time period after the first time period has elapsed, and the first time period is different from the second time period, the first time period is a duration corresponding to one cycle of the first frequency, and the second time period is a duration corresponding to one cycle of the second frequency.