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Illuminative light communication device

  • US 7,583,901 B2
  • Filed: 10/23/2003
  • Issued: 09/01/2009
  • Est. Priority Date: 10/24/2002
  • Status: Expired due to Fees
First Claim
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1. 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.

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