JP2004147063A - Broadcast system and light bulb - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast system for distributing a number of pieces of information through power line signal transmission and through illuminating optical signal transmission using LED, and also an illuminating light bulb for use in such a broadcast system. <P>SOLUTION: Information from an information source 1 is modulated, frequency-multiplexed and superimposed on a power waveform by a power line modulator 2, sent to a power line 3, and then sent to an LED lighting device 6. The input information signal is rectified by an AC/DC converter 11 to a DC power and sent to a superimposer 14. An information waveform corresponding to a predetermined frequency component of an output of the converter is extracted by one of band pass filters 12 selected by a selector 13, sent to the superimposer 14, combined with a DC power waveform, and applied to a group of LEDs 15. The LED group 15 emits light when fed with a power, the quantity of emitted light varies with a signal waveform of the information. Thus, the information can be transmitted in the form of light. The emitted light can be received at a light receiving terminal 7 so that, when the received light is demodulated. the information can be obtained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a broadcasting system for distributing information by light, and a light bulb suitable for such a broadcasting system.
[0002]
[Prior art]
In recent years, communication systems using radio waves have become familiar with the spread of portable terminals and the like. Recently, with the depletion of the frequency, the use of infrared light having a shorter wavelength has been actively performed. However, in addition to the depletion of the frequency of radio waves, effects on medical equipment and various precision instruments have been confirmed, and there is a concern that infrared rays may also affect the human body (for example, eye safe). For this reason, optical communication has been attracting attention as a method capable of safely communicating.
[0003]
As one of the communication systems, a power line communication system has been studied. This power line communication system transmits information by using a power line laid in a house or a building and supplying power as it is as a signal transmission medium. Power lines are very popular infrastructures, and basically allow communication between devices connected by power lines. However, communication cannot be performed with a device that is not connected by a power line, such as a mobile terminal.
[0004]
On the other hand, white LEDs have been realized by the development of blue LEDs. White LEDs have the characteristics that they consume much less power than conventional incandescent lamps and fluorescent lamps, and are small in size and have a long life. Therefore, use of this white LED as an illumination light source has been considered. The white LED also has a feature that its response speed is high with respect to input power. Focusing on this feature, research has been conducted to provide a signal transmission function by electrically controlling the blinking or light quantity.
[0005]
Research is also being conducted to integrate such a signal transmission function using light using a white LED with the above-described power line communication system. For example, in Non-Patent Document 1 and the like, the inventors have proposed. In such a system, the human body is not affected because light is used. In addition, since the power line is used, the infrastructure has already been prepared, and it is possible to construct the system at low cost by eliminating the need for wiring laying work and the like. In addition, communication is possible even if it is not connected to a power line, such as a portable terminal, if it has a light receiving means. Furthermore, since the information can be emitted as light simply by controlling the blinking or light quantity of the white LED by the signal on the power line as it is, there is an advantage that it can be realized with a very simple configuration.
[0006]
However, in the system described in Non-Patent Document 1, etc., one-to-one communication is mainly performed experimentally, and further application is expected.
[0007]
[Non-patent document 1]
Toshihiko Komine, Yuichi Tanaka, Masao Nakagawa, "A Fusion System of White LED Lighting Signal Transmission and Power Line Signal Transmission", IEICE Technical Report, IEICE, March 12, 2002, Vol. 101, no. 726 pp. 99-104
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and provides a broadcasting system for distributing a large amount of information by power line signal transmission and illumination light signal transmission using an LED, and a lighting system used in such a broadcasting system. It is intended to provide a light bulb for use.
[0009]
[Means for Solving the Problems]
The present invention relates to an LED light source for illumination, a power line for supplying power to the LED light source, and information to be modulated and multiplexed on the power line and superimposed on a power waveform for transmission in a broadcasting system. Modulating means, and filter means for selectively separating one or more from a plurality of pieces of modulated information on the power line to control the light amount or blinking of the LED light source, and by changing or blinking the light amount of the LED light source. It is characterized by transmitting information.
[0010]
As described above, in the present invention, a plurality of pieces of information are transmitted on the power line. If, for example, a selection unit for selecting information is provided as a filter unit, and the light amount or blinking of the LED light source is controlled by the selected information, the information can be selectively broadcast by light from the LED light source. Can be. The information can be selected by a physical switch or the like, or can be selected according to the instruction information on the power line, or the information can be selected in the receiving device.
[0011]
More specifically, the information modulating means multiplexes a plurality of pieces of information by frequency division and transmits the multiplexed information to the power line, and the filter means is provided with a plurality of bandpass filters having different frequency bands, and one of them is selected. Can be configured to separate the information. Alternatively, the information modulating means multiplexes a plurality of pieces of information in a time-division manner, adds tag information to the divided information, and transmits the information to the power line. The filter means identifies the information by the tag information and selectively selects the information. It can be configured to separate.
[0012]
The present invention also provides a light bulb for use in such a broadcasting system, which emits light and illuminates with supplied power, comprising an LED light source for illumination and a plurality of modulated light beams superimposed on the supplied power. And a filter means for selectively separating one or a plurality of pieces of information from the above information and controlling the light amount or blinking of the LED light source. Generally used power is AC, and when used with AC power, an AC / DC converter for converting AC into DC is provided, and the information component separated by the filter is converted by the AC / DC converter. It is preferable to drive the LED light source by superimposing it on DC power. By simply using such a light bulb instead of a commonly used light bulb, information on the power line can be transmitted by light. Therefore, it is possible to realize the distribution of information by light using the lighting equipment without changing the lighting equipment.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a first embodiment of the broadcasting system of the present invention. In the figure, 1 is an information source, 2 is a power line modulator, 3 is a power line, 4 and 5 are outlets, 6 is an LED lighting device, 7 is a light receiving terminal, 11 is an AC / DC converter, 12 is a band pass filter, and 13 is A selection unit, 14 is a superimposition unit, and 15 is an LED group. The information source 1 can be configured by a device that outputs various information, such as a tuner and a receiver for TV, CATV, radio, cable broadcasting, and the like, in addition to the computer. Therefore, the information to be broadcast may be various information such as video, music, sound, image, character data, and the like. The information to be broadcast may be one or more. Here, it is assumed that a plurality of pieces of information are output.
[0014]
The power line modulator 2 modulates and multiplexes one or more pieces of information output from the information source 1, superimposes the information on a power waveform, and sends out the power line 3. It should be noted that ordinary power line communication often includes a demodulation unit in order to realize bidirectional communication, but a broadcasting system does not require a demodulation unit because it is one-way communication. In this example, information is multiplexed by frequency division as an example of a method of multiplexing information.
[0015]
The power line 3 is an electric wire generally laid indoors and outdoors. This power line 3 can use an existing one. In order to receive power supply from the power line 3, outlets 4 and 5 are provided on a wall surface or the like. Existing outlets 4 and 5 can also be used. In the example shown in FIG. 1, the power line modulator 2 is inserted into the outlet 4, and the LED lighting fixture 6 is inserted into the outlet 5 for use. Of course, the power line 3 and the outlets 4 and 5 may be newly provided. In this example, it is assumed that AC power used as general commercial power is supplied as power.
[0016]
The LED lighting device 6 is a lighting device connected to the power line 3 to illuminate the vicinity. For example, in the case of a room, it is provided on a ceiling or the like. In addition, lighting devices for various uses such as spot lighting may be used. In this example, the LED lighting device 6 includes an AC / DC converter 11, a bandpass filter 12, a selector 13, a superimposing unit 14, an LED group 15, and the like.
[0017]
The AC / DC converter 11 converts AC power supplied from the power line 3 to DC because the LED group 15 needs to be driven by DC power to emit light. Existing technology can be used as the AC / DC converter 11. Further, the voltage is adjusted in accordance with the operating voltage of the LED group 15. Further, the band-pass filter 12 supplies power required for operation. Since the modulated information waveform is superimposed on the power line 3 as described above, it is desirable that the information waveform be minimized from appearing in the DC waveform by, for example, a smoothing circuit.
[0018]
The bandpass filter 12 is provided for extracting a signal of information superimposed on the power line 3. As described above, in this example, since each piece of information is multiplexed by frequency division, one piece of information is selectively separated from a plurality of pieces of information by the bandpass filter 12 that passes only a specific frequency. It is possible. The example shown in FIG. 1 shows an example in which a plurality of band-pass filters having different passing frequencies are provided in parallel. Alternatively, it may be constituted by a band-pass filter capable of changing a frequency band to be passed. The separated information waveform may be subjected to bias, shaping or amplification.
[0019]
The selection unit 13 selects one or a plurality of filters to be used from among the plurality of filters provided in the bandpass filter 12, and thereby selects information to be distributed by light. The selection is performed manually, or by selectively demodulating a control signal sent as a specific frequency and selecting a filter using the control signal. A configuration may be used. Alternatively, a configuration may be used in which the frequency that can be passed by the bandpass filter 12 can be changed, and the selection unit 13 sets a frequency in accordance with information distributed to the bandpass filter 12. In FIG. 1, the selection unit 13 is provided at the front stage of the bandpass filter 12, but may be provided at the rear stage. Further, when the configuration is such that the frequency band passed by the band-pass filter 12 can be changed, the selection unit 13 may be configured to set the frequency band for the band-pass filter 12 according to a control signal of a specific frequency. . Further, when the LED lighting device 6 is to deliver only information transmitted at a fixed frequency, the selection unit 13 is not provided, and a device that passes a fixed frequency band is provided as the bandpass filter 12. Just do it.
[0020]
The superimposition unit 14 superimposes the information signal extracted by the bandpass filter 12 on the power waveform converted into the direct current by the AC / DC conversion unit 11. Thus, the voltage applied to the LED group 15 can be changed by the information signal, and the light amount or blinking of the LED group 15 can be controlled. For example, when the LED group 15 is turned on and off, the power from the AC / DC converter 11 may be ON / OFF controlled by a signal from the bandpass filter 12.
[0021]
The LED group 15 is basically an LED light source for illuminating, and can be composed of, for example, a large number of white LEDs. Of course, the same applies to a configuration in which red, blue, and green LEDs are collected. The LED group 15 emits light when driven by the power supplied from the superimposing unit 14. Since LEDs have good response characteristics, information can be distributed by light by changing the amount of light or blinking the information signal. At this time, even if the light amount is changed or blinked at a high speed, it is not perceived by human eyes, and can be used as it is as illumination.
[0022]
The light receiving terminal 7 is a terminal having light receiving means, receiving light emitted from the LED lighting device 6, extracting a signal of information, demodulating the signal, and receiving information. The light-receiving terminal 7 may be any device as long as it has a light-receiving means, and may be a personal computer, a portable terminal, a mobile phone, or other various devices such as an audio device provided with the light-receiving means or a display device such as a television. Good.
[0023]
Next, an example of an operation of the broadcast system according to the first exemplary embodiment of the present invention will be briefly described. As the information source 1, various contents to be broadcast are prepared. For example, in addition to data from a computer, various information such as TV, CATV, radio, and cable broadcasting is prepared according to the application.
[0024]
One or more pieces of information output from the information source 1 are modulated in the power line modulator 2, multiplexed and superimposed on a power waveform, and transmitted to the power line 3. FIG. 2 is an explanatory diagram of an example of a signal waveform on an electric wire. In this example, a commercial AC power supply (50 Hz / 60 Hz) is used, and an information signal waveform is superimposed on an electric waveform. In order to avoid the influence on other devices, the information signal waveform is superimposed with a smaller waveform than the power waveform. The enlarged view illustrated in FIG. 2B illustrates an example in which information is modulated by a method such as BPSK and superimposed on a power waveform. Note that the power line 3 can use an existing electric wire. In addition, if power is obtained from an outlet and information is separated and used, information can be provided in the same manner as power line communication generally used.
[0025]
Power and information are transmitted from the outlet 5 to the LED lighting device 6 through the power line 3. In the LED lighting device 6, electric power with a signal waveform is obtained from the outlet 5. On the other hand, the AC / DC converter 11 rectifies the DC power to drive the LED group 15 and sends the DC power to the superimposing unit 14. On the other hand, only a predetermined frequency component is extracted by the filter in the band-pass filter 12 selected by the selection unit 13. At this time, it is advisable to apply a bias or to perform waveform shaping or amplification as necessary.
[0026]
The power waveform converted into the direct current by the AC / DC converter 11 and the information signal extracted by the band-pass filter 12 are combined by the superposition unit 14 and applied to the LED group 15. The voltage applied to the LED group 15 changes according to the signal waveform of the synthesized information. As a result, the light emission amount of the LED group 15 changes according to the signal waveform of the information, and the information can be transmitted.
[0027]
The light emitted from the LED group 15 is received by a light receiving element provided on the light receiving terminal 7 side. Then, information can be acquired in the light receiving terminal 7 by extracting and demodulating a change in the received light amount. In this way, of the information provided from the information source 1, the information selected by the LED lighting fixture 6 is transmitted together with the illumination light and received by the light receiving terminal 7. At this time, the light receiving section of the light receiving terminal 7 does not have to face the LED lighting fixture 6 (the LED group 15) accurately, and if it can receive illumination light to some extent, it is possible to acquire an information signal with good communication quality. it can. This is because the apparent transmission power is very large because the LED illumination light is used for illumination. When a signal is transmitted with the same signal strength by the conventionally used infrared rays, the influence on the human body (for example, eyes) is unavoidable, and in that sense, the transmission of information by light is advantageous.
[0028]
Although only one LED lighting fixture 6 is shown here, for example, in the case where a plurality of LED lighting fixtures 6 are arranged nearby, by selecting and broadcasting the same information, it becomes more resistant to shadowing. , And can also respond to movement. Conversely, even if there is an LED lighting device 6 that selects and broadcasts other information nearby, if it is received near one LED lighting device 6, light from the other LED lighting device 6 is attenuated. The effect is smaller. When interference with such other LED lighting equipment becomes a problem, when modulating the information from the information source 1, a modulation method that is resistant to interference, for example, OOK-RZ (On-Off Keying, Return). -To-Zero) or OFDM (Orthogonal Frequency Division Multiplexing).
[0029]
In the example shown in FIG. 1, the AC / DC converter 11, the bandpass filter 12, and the like have been described as being provided in the LED lighting apparatus 6. However, the present invention is not limited to this. For example, these circuits are provided in a wall switch for turning on and off the lighting, and a power line portion from the wall switch to the LED lighting device 6 is configured to supply a DC with a superimposed information waveform. You may. In this case, a switch serving as the selection unit 13 can be provided on the wall together with the switch for turning on and off the illumination. Of course, the arrangement of each part is not limited to these examples, and is arbitrary.
[0030]
FIG. 3 is a block diagram showing a second embodiment of the broadcasting system of the present invention. In the figure, the same parts as those in FIG. Reference numeral 16 denotes a band pass filter, 17 denotes a determination unit, and 18 denotes a selection unit. In this example, fixed identification information (IP, PN code, etc.) is allocated to each LED lighting fixture 6 or each information, and only specific information is selected and broadcast by comparing the identification information.
[0031]
Here, the power line modulator 2 divides a plurality of pieces of information from the information source 1 like a packet, attaches a header to the top, and superimposes it on the power waveform by time division multiplexing. The header contains identification information.
[0032]
The LED lighting device 6 includes a bandpass filter 16, a determination unit 17, a selection unit 18, and the like, in addition to the LED group 15 and the AC / DC conversion unit 11. The band-pass filter 16 removes an AC component of power and separates a signal component of information. In this example, all signals of a plurality of pieces of information pass through the band-pass filter 16.
[0033]
The determination unit 17 extracts a header portion from the signal of the information separated by the band-pass filter 16, compares the extracted header portion with the preset identification information, and determines whether the transmitted information is to be transmitted by light. Determine whether or not. If the signal is to be transmitted, the selector 18 selects the signal of the information part and causes the selector 14 to output the signal. The signal that has passed through the selection unit 18 is superimposed on the power waveform converted into direct current by the AC / DC conversion unit 11 in the superposition unit 14, and is supplied to the LED group 15. Thereafter, as in the first embodiment described above, the light quantity of the LED group 15 is changed or blinking is controlled by the information signal, and the information is transmitted by light. The illumination is performed by the light emission of the LED group 15.
[0034]
In the second embodiment, for example, if identification information is assigned to each LED lighting fixture 6, information to be broadcast for each LED lighting fixture 6 can be controlled on the side that sends information to the power line 3. In addition, by configuring the identification information to be settable, it becomes possible to select information to be broadcast from each LED lighting fixture 6. In this case, a plurality of pieces of identification information can be set, and a plurality of pieces of information can be selected and transmitted by light.
[0035]
In the second embodiment, various modes can be adopted as in the first embodiment. The advantages are also the same as in the first embodiment.
[0036]
In addition to these embodiments, information to be distributed by illumination light is not selected, all information transmitted through the power line 3 is distributed by light, and information is selected by the terminal that receives the information. Is also good.
[0037]
FIG. 4 is a conceptual diagram showing one embodiment of a light bulb applicable to the broadcasting system of the present invention. In the figure, 21 is a light bulb, 22 is a base, and 23 is a socket. The example shown in FIG. 4 can be applied as a part of the LED lighting device 6 in each embodiment of the above-described broadcast system. As a lighting fixture, a lighting fixture to which an incandescent light bulb is mounted has been generally used. A socket 23 is provided in advance on the ceiling or the like, and electrical connection is achieved by screwing the base 22 of the light bulb 21 into the socket 23 as shown in FIG. In this example, the existing equipment is used as it is for the wiring portion up to the power line 3 and the socket 23. As shown in FIG. 4A, the above-described first or second embodiment is installed in a light bulb 21. The configuration inside the LED lighting fixture 6 indicated by the symbol is accommodated. For example, it can be accommodated in the base 22 of the bulb 21. Further, unlike a point light source using a filament such as a conventional incandescent lamp, a large number of LEDs are arranged in a plane, so that a circuit portion can be accommodated on the back surface.
[0038]
By using such a light bulb 21, it is possible to use the light bulb 21 as a light information transmission source simply by replacing a general incandescent light bulb with the light bulb 21 of the present invention.
[0039]
Needless to say, various types of conventionally used light bulbs have various shapes other than the shape shown in FIG. The shape of the light bulb 21 of the present invention is not limited to the shape shown in FIG. For example, it is also possible to configure a light bulb 21 having a shape in which LEDs are linearly arranged like a fluorescent light.
[0040]
Next, some application examples of the broadcasting system of the present invention will be described. FIG. 5 is an explanatory diagram of a first application example of the present invention. In the figure, 31 is an LED lighting device, 32 is a work, and 33 is a light receiving terminal. The example shown in FIG. 5 shows an example in which the broadcasting system of the present invention is applied to an art museum, a museum, and the like. In an art museum or a museum, lighting such as a spotlight is applied to each work or exhibit (hereinafter, work 32), and a description of the work 32 is attached. As the lighting fixture for illuminating the work 32, the LED lighting fixture 31 of the present invention is used. On the other hand, the explanation information of the work 32 is superimposed on the power line 3 that supplies power to the LED lighting apparatus 31 and transmitted. At this time, the explanation information to be superimposed on the power line 3 is superimposed on many works 32. Then, in the LED lighting fixture 31 provided for each work 32, the description information about each work is selectively extracted, and the light amount or blinking of the illuminating light is controlled as described above, so that the description information is obtained. Transmitted by light.
[0041]
If the viewer takes out the light receiving terminal 33 in front of the work 32, the light is radiated to the light receiving terminal 33, and the light amount change or blinking thereof is taken out and demodulated, so that the explanation information of the work 32 can be referred to. . When the viewer moves in front of the next work, the explanation information of the work is transmitted by the light illuminating the work, and the explanation information of the work can be referred to by referring to the light receiving terminal 33. .
[0042]
As described above, the explanation information of each work 32 is superimposed on the power waveform on the power line 3 and transmitted. In the LED lighting apparatus 31 that illuminates each work, the explanation information of the corresponding work 32 is selected and transmitted by light. Thereby, the explanation information of each work 32 can be presented to the viewer together with the lighting of the work 32.
[0043]
The description information for each work is not limited to one. For example, when providing description information in a plurality of languages for each work, the LED lighting fixture 31 selects a plurality of pieces of description information corresponding to the work 32 to be illuminated and transmits the selected information by light. Then, on the light receiving terminal 33 side, a plurality of pieces of explanatory information transmitted by light may be separated and demodulated, and among them, the explanatory information in a language designated by the viewer may be selected and presented to the viewer. Alternatively, a configuration may be adopted in which a plurality of pieces of explanation information, such as explanation information for adults and explanation information for children, are transmitted from the same LED lighting apparatus 31 to one piece of work 32 by light. Note that the description information is not limited to character information, and may be, for example, audio information, an image, a moving image, or the like. Further, the information may be information obtained by appropriately combining these.
[0044]
FIG. 6 is an explanatory diagram of a second application example of the present invention. In the figure, 41 is an LED lighting fixture, 42 and 43 are seats, and 44 is a light receiving terminal. This second application example shows an example in which the broadcasting system of the present invention is applied to an aircraft, a train, a bus, and the like. In the example shown in FIG. 6, an LED lighting device 41 is provided for each seat, and each seat is illuminated. At the same time, information transmitted through the power line 3 is transmitted by light. Further, a light receiving terminal 44 is provided on the back of the front seat 42 so that a passenger sitting on the seat 43 can refer to the screen of the light receiving terminal 44. The light emitted from the LED lighting device 41 is received by the light receiving terminal 44, and information transmitted by the light is acquired by the light receiving terminal 44. By operating the light receiving terminal 44, the passenger can select and view desired information.
[0045]
Particularly, in an aircraft including a spacecraft or the like, the use of radio waves in the aircraft must be avoided because there is a concern about the influence on instruments and the like. However, light has no effect on instruments or the like, nor on the human body. Therefore, information can be distributed wirelessly as shown in FIG. The selection of the information may be performed by the light receiving terminal 44 in addition to the LED lighting device 41.
[0046]
It should be noted that direct current is often used as power for lighting in aircraft, trains, buses, and the like. Therefore, it is not necessary to provide the AC / DC converter 11 in the configurations shown in FIGS. For example, when transmitting all information transmitted through the power line 3 by light, the band-pass filter 12 and the superimposing unit 14 are also unnecessary, and the LED group is directly used by the superimposed power of the information waveform supplied from the power line 3. Can drive information by light.
[0047]
As described above, two application examples of the broadcasting system of the present invention have been described. However, the present invention is not limited to these application examples, and can be applied to any use for distributing information by light. For example, in a general office or the like, it can be used as a distribution system to a personal computer on a desk, or can be used for transmitting information to each process in a factory. Furthermore, distribution of television and radio broadcasts at home is also possible, and it is possible to view in any room with a portable display. In this case, it is also possible to provide a selecting unit corresponding to the tuner in the LED lighting fixture and control the selecting unit in the LED lighting fixture by a television controller or the like to select a channel. Also, for example, in a stadium or event venue where sports are performed, various information on the sports or events being performed or information on other venues is transmitted by being superimposed on the illumination light and received by a portable terminal or the like owned by the audience. Alternatively, the information may be configured to be acquired.
[0048]
【The invention's effect】
As is apparent from the above description, according to the present invention, a large amount of information can be distributed by light using the lighting equipment as it is. At this time, there is no need to separately provide a transmitting device as in the related art, and it is not necessary to newly lay a communication cable or the like. Therefore, it is possible to construct a broadcast system at low cost. In addition, there is no effect on the human body such as eye safe like infrared rays, and there is the effect that it is possible to construct a safe broadcasting system without limiting the application to airplanes like radio waves. is there.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a broadcast system according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of an example of a signal waveform on an electric wire.
FIG. 3 is a block diagram illustrating a broadcast system according to a second embodiment of the present invention.
FIG. 4 is a conceptual diagram showing one embodiment of a light bulb applicable to the broadcasting system of the present invention.
FIG. 5 is an explanatory diagram of a first application example of the present invention.
FIG. 6 is an explanatory diagram of a second application example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Information source, 2 ... Power line modulator, 3 ... Power line, 4, 5 ... Outlet, 6 ... LED lighting equipment, 7 ... Light receiving terminal, 11 ... AC / DC conversion part, 12 ... Bandpass filter, 13 ... Selection part, 14: superimposition unit, 15: LED group, 16: bandpass filter, 17: determination unit, 18: selection unit, 21: light bulb, 22: base, 23: socket, 31: LED lighting fixture, 32: work, 33 ... Light receiving terminal, 41: LED lighting device, 42, 43: Seat, 44: Light receiving terminal.

Claims (8)

An LED light source for illumination, a power line for supplying power to the LED light source, information modulation means for modulating and multiplexing a plurality of pieces of information on the power line, and superimposing the information on a power waveform, and transmitting the modulated information, Filter means for selectively separating one or a plurality of pieces of information from the plurality of pieces of information and controlling the light amount or blinking of the LED light source, and transmitting information by changing or blinking the light amount of the LED light source. Broadcasting system. The broadcasting system according to claim 1, wherein the filter unit includes a selection unit for selecting information. The broadcasting system according to claim 2, wherein the selection unit selects information to be transmitted by changing or blinking the light amount of the LED light source according to the instruction information on the power line. The said filter means controls the light quantity or blinking of the said LED light source in the state where several information was multiplexed, and performs the selection of the information in the receiving side apparatus which receives the light from this LED light source. Item 2. The broadcasting system according to item 1. 2. The information modulating unit multiplexes a plurality of pieces of information by frequency division, and the filter unit selects one of a plurality of bandpass filters having different frequency bands to separate the information. The broadcasting system described in 1. The information modulating unit multiplexes a plurality of pieces of information by time division and adds tag information to the divided information and transmits the information. The filter unit identifies information by the tag information and selectively selects information. The broadcasting system according to claim 1, wherein the broadcasting system is separated. A light bulb that emits light and illuminates with supplied power, and selectively separates one or more from an LED light source for illumination and a plurality of pieces of modulated information superimposed on the supplied power. A light bulb having a filter means for controlling the amount of light or blinking of an LED light source. The power is AC, and an AC / DC converter for converting AC into DC is provided, and the information component separated by the filter is superimposed on the DC power converted by the AC / DC converter, and the LED light source is superimposed. Driving a light bulb.

Images