JP2008228084A - Visible light communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a visible light communication system capable of improving convenience in transportation means. <P>SOLUTION: A data transmitting device 10 modulates data for transmission by means of a data modulation section 20 and transmits the modulated data with it put on a carrier wave that is illumination light from an LED illumination 11. A data receiving device 12 demodulates received illumination light by means of a signal demodulation section 32 and displays the demodulated data on a display section 35. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention generally relates to a visible light communication system using visible light, and more particularly to a visible light communication system that receives and displays visible light transmitted from a transportation means.

In general, in a communication technique using visible light, a light emitting device using an electroluminescence element capable of transmitting signal light composed of light modulated based on input data is disclosed ( Patent Document 1).
JP 2003-115803 A

  However, the technique of Patent Document 1 does not disclose a technique of transmitting using visible light from a transmission device that moves in a transportation means.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a visible light communication system capable of improving convenience in transportation.

  In order to achieve the above object, according to one aspect of the present invention, there is provided a visible light communication system including a data transmission device and a data reception device provided in a transportation means, wherein the data transmission device transmits data for transmission. Modulation means for modulating the data, and transmission means for transmitting the data modulated by the modulation means on a carrier wave as illumination light to the data receiving apparatus, wherein the data receiving apparatus is received by the transmitting means Visible light comprising detection means for detecting illumination light, demodulation means for demodulating illumination light detected by the detection means, and display means for displaying data demodulated by the demodulation means A communication system is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the convenience can be improved in the transportation means using visible light communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the visible light communication system according to the embodiment of the present invention transmits data using illumination light from an illumination device such as LED illumination as a carrier wave (with modulated data on a carrier wave that is illumination light), Data that is digitally or analog-modulated using the subcarrier is output with the illumination light as the carrier. The illumination light carrying the data is not visible to the human eye, and the data is transmitted in a state that does not change in appearance from other ordinary illuminations. The receiving side device has a camera, and the camera receives illumination light. The transmitted data can be obtained by extracting the modulation data carried by the received illumination light and demodulating the data.

  As shown in FIG. 1, the visible light communication system according to the embodiment of the present invention is a transportation means including a visible light communication data transmission device 10, for example, a train 1, a visible light communication data reception device 12, and received. It consists of a system 14 for processing information. The data transmission device 10 is provided on the front side or the rear side with respect to the traveling direction of the train 1. Further, the transportation means is not limited to the train 1 and can be applied to transportation means such as a bus.

  FIG. 2 is a block diagram showing a visible light communication system according to an embodiment of the present invention.

  The visible light communication system according to the embodiment of the present invention will be described in detail using the block diagram. The data transmission unit 10 includes a data modulation unit 20, a transmission data creation unit 21, an LED drive unit 22, a power supply unit 23, and an LED illumination unit 11, and generates a drive power for LED illumination and is determined in advance. Transmission data is created from the data, and the data is digitally or analog-modulated using a subcarrier at the transmission timing, and then output to the LED illumination together with the modulation data by the LED drive unit. The data modulator 20 modulates the created data and transmits it to the LED driver 22. In addition, data is digitally or analog-modulated using subcarriers at the transmission timing. The LED drive unit 22 performs control to output illumination light from the LED illumination unit 11 based on the modulated data. The transmission data creation unit 21 creates transmission data from the received data. In addition, data for transmitting predetermined data by setting or writing is created. In addition, although this embodiment demonstrates the example which used LED as an illuminating device, an illuminating device is not limited to LED, What is visible light is not ask | required.

  The data receiving device 12 includes a light receiving unit 24, a waveform extracting unit 31, and a signal demodulating unit 32. The system 14 includes a display unit 35, a control unit 13, and an information processing unit 33.

  The light receiving unit 24 is a device that receives illumination light such as a camera. The waveform extraction unit 31 detects the illumination light received by the light receiving unit 24. The signal demodulator 32 separates and demodulates the modulated data from the illumination light received by the light receiver 24. The information processing unit 33 receives and processes the data demodulated by the signal demodulation unit 32. The control unit 13 controls the entire system 14 such as the information processing unit 33 and the display unit 35. The display unit 35 displays the data demodulated by the signal demodulation unit 32 and processed by the information processing unit 33. That is, as data sent from the transmission side, data such as characters, pictures, and images is displayed by the display unit 35. For example, information such as a destination which is data from the train 1 entering the station is displayed. In addition, since the train 1 enters a predetermined route, the camera such as the light receiving unit 24 is installed at the best preset location on the platform inside the station, so that it can receive illumination light stably at any time. can do.

  Next, with reference to the flowchart of FIG. 3, the control method of the visible light communication system which concerns on embodiment of this invention is demonstrated.

  The transmission data creation unit 21 of the train 1 creates transmission data. The data modulator 20 modulates the created transmission data. After the data is digitally or analog-modulated using the subcarrier, the illumination light is output and transmitted to the LED illumination unit 11 together with the modulation data by the LED drive unit 22 (step S101). Next, the light receiving unit 24 such as a camera of the data receiving unit 12 receives illumination light (step S102). For the received illumination light, the waveform extraction unit 31 separates the modulated data from the illumination light, and the signal demodulation unit 32 demodulates the data. The data demodulated by the information processing unit 33 is received and processed, the display unit 35 displays the data demodulated by the signal demodulation unit 32 and processed by the information processing unit 33 (step S103).

  The display unit 35 may be an electronic bulletin board, a liquid crystal panel, or the like, and is installed in a place where users can browse the station.

  As described above, according to the above-described embodiment, convenience for the user can be improved in the transportation means using visible light (illumination light) communication. Further, since the transportation means often has a predetermined route to travel, a transmission device and a reception device can be easily arranged, and data transmission / reception can be easily realized in visible light communication.

  Next, FIG. 4 is a schematic diagram illustrating a configuration of a modified example of the above-described embodiment.

  As shown in FIG. 4, the data transmission device 10 is provided on the side surface side with respect to the traveling direction of the train 1.

  When the train 1 enters the platform inside the station, illumination light is transmitted from the data transmission device 10 provided on the side of the train 1. There is a user at the platform in the station, and the illumination light is received by the built-in camera 24 of the mobile phone 50 possessed by the user.

  FIG. 5 is a block diagram showing a configuration of the modified example. The data receiving device is the mobile phone 50. The difference from the embodiment described above is that the MY route data 37 is stored in the mobile phone 50. The MY route data 37 is route data that is preferentially used by a user who has the mobile phone 50. For example, route data from home to the office. The determination unit 36 compares the MY route data 37 with the destination data of the train 1 obtained by demodulating the illumination light received by the light receiving unit (camera) 24, and determines whether the MY route data 37 corresponds to the MY route data 37. judge. For example, if the determination unit 36 determines that the vehicle corresponds to the MY route data 37, the display unit 35 displays on the liquid crystal display or the like of the mobile phone 50 that the MY route data 37 corresponds to the train and prompts the user to get on. . On the other hand, if the determination unit 36 determines that the MY route data 37 does not correspond, the mobile phone 50 displays a notification that the train does not correspond to the MY route data 37 on the liquid crystal display or the like and notifies the user.

  As described above, according to the above-described modification, in the transportation means using visible light (illumination light) communication, it is possible to immediately display whether or not the transportation means in front of the user matches the destination of the user, User convenience can be improved.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The schematic diagram which showed the visible light communication system which concerns on one Embodiment of this invention. 1 is a block diagram showing a visible light communication system according to an embodiment of the present invention. The flowchart explaining control of the visible light communication system which concerns on embodiment of this invention. The schematic diagram which showed the modification which concerns on embodiment of this invention. The block diagram which showed the modification which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data transmission part, 11 ... LED illumination part, 12 ... Receiver, 13 ... Control part, 14 ... System, 21 ... Transmission data creation part, 22 ... LED drive part, 23 ... Power supply part, 31 ... Waveform extraction part, 32. Signal demodulator

Claims (7)

A visible light communication system including a data transmission device and a data reception device provided in a transportation means,
The data transmission device includes:
Modulation means for modulating data for transmission;
Transmitting means for transmitting the data modulated by the modulating means to the data receiving device on a carrier wave that is illumination light;
The data receiving device is:
Detecting means for detecting the illumination light transmitted by the transmitting means;
Demodulation means for demodulating the illumination light detected by the detection means;
Display means for displaying data demodulated by the demodulation means;
A visible light communication system comprising: The visible light communication system according to claim 1,
The visible light communication system, wherein the data transmission device is provided on any one or more of a front side, a rear side, and a side surface with respect to a traveling direction of the transportation means. The visible light communication system according to claim 1,
The visible light communication system, wherein the illumination light is output from an LED. The visible light communication system according to claim 1,
The visible light communication system, wherein the demodulation means separates the data from the illumination light detected by the light detection means, and demodulates the separated data. The visible light communication system according to claim 1,
The visible light communication system, wherein the data reception device is a device installed at a place through which the transportation means passes or a portable terminal. The visible light communication system according to claim 5,
The portable terminal further includes storage means for storing desired route data, compares the data demodulated by the demodulation means with the desired route data, and gets on the transportation means that has transmitted the data. A visible light communication system, further comprising discrimination means for discriminating whether or not it is optimal. The visible light communication system according to claim 5,
The visible light communication system, wherein the mobile terminal includes a camera, and the camera receives illumination light from the data transmission device.

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