Patent ID: 7583901

Claim:
A broadcast system, comprising: a semiconductor light-emitting source for lighting; a power line that supplies electric power to the semiconductor light-emitting source; a data modulator that modulates and multiplexes a plurality of pieces of data, superimposes the resulting plurality of pieces of data on an electric power waveform into a plurality of modulated pieces of data, and transmits the plurality of modulated pieces of data via the power line; and a selector that selects one or more pieces of data to be transmitted in the form of light out of the plurality of modulated pieces of data on the power line; and a superimposing means for superimposing a signal of the selected data onto a voltage to be applied to the semiconductor light-emitting source, wherein the data selected by the selector is transmitted based on changes in light intensity or blinking of the semiconductor light-emitting source.