Visible Light Communication Transmitter and Visible Light Communication System
AssigneeTaiyo Yuden Co., Ltd.
InventorsMasashi Yamada, Kousuke Nakamura
Life of this patent
Estimating the term…
Abstract
Using a general-purpose cost-advantageous blue-light-excited-type white light emitting diode (LED), destruction of devices is prevented and visible light data communication is performed at a sufficient transmission rate. The blue-light-excited-type white LED is driven based on a driving current signal generated based on transmission data. While a visible light signal is outputted to a receiver, a multi-tone driving current signal is generated by a rising pulse and a falling pulse to a rising edge and a falling edge of the transmission data, respectively. Each of pulse widths of the rising pulse and the falling pulse is the same as a unit interval of the transmission data.
Claims13
A visible light communication transmitter outputting a visible light signal from a blue-light-excited-type white LED driven by a driving current signal generated based on a transmission data to a receiver, the transmitter comprising:
- a multi-tone driver configured to generate the driving current signal of multiple tones by adding a rising pulse and a falling pulse to a rising edge and a falling edge of the transmission data, respectively,
- wherein each of pulse widths of the rising pulse and the falling pulse is same as a unit interval of the transmission data.
A visible light communication system, comprising:
- a visible light communication transmitter configured to output a visible light signal from a blue-light-excited-type white LED driven by a driving current signal generated based on a transmission data to a receiver and including a multi-tone driver configured to generate the driving current signal of multiple tones by adding a rising pulse and a falling pulse to a rising edge and a falling edge of the transmission data, respectively, each of pulse widths of the rising pulse and the falling pulse being same as a unit interval of the transmission data;
- and
- a visible light communication receiver configured to receive the visible light signal of multiple tones outputted from the visible light communication transmitter and configured to convert the visible light signal of multiple tones received from the transmitter into an electric signal to output a received data.
Dependencies are inferred from the claim text.