JP2009060552A - Power-line communication system, power-line communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein power-line communication can not be carried out normally and efficiently among a plurality of apparatuses. <P>SOLUTION: A power-line communication system is provided with: a first transmitting apparatus 11 having a first modulating section 102 for modulating a signal of a first frequency with first information, and a first transmitting section 103 for transmitting the modulated signal with a power communication line 1000 by superposing the modulated signal on a voltage; a first receiving apparatus 12 having a first separating section 104 for separating the first information of the superposed first frequency from the voltage; a second transmitting apparatus 21 having a second modulating section 202 for modulating a signal of a second frequency, which is different from the first frequency, with second information, and a second transmitting section 203 for transmitting the modulated signal with the power communication line 1000 by superposing the modulated signal on the voltage; and a second receiving apparatus 22 having a second separating section 204 for separating the second information of the superposed second frequency from the voltage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power communication line system and the like for communicating information via a power communication line.

As a conventional power-line communication (PLC) system, a content stream (i.e., audio) between a content server connected to a power line communication network and a remote electronic device having an interface module and ultra-wideband connection. , Video, data) have been provided (for example, see Patent Document 1).
JP-T-2007-504711 (first page, FIG. 1 etc.)

  However, in the conventional power line communication system, communication is performed at one predetermined frequency or one frequency band. Therefore, when two or more devices connected to the power line communication network communicate with each other, communication is performed simultaneously. However, there is a problem that information may collide and normal communication may not be performed.

  In addition, it is conceivable that each device determines whether or not communication is performed by another device and performs communication when communication by another device is not performed. In this case, when the number of devices increases, there is a problem that data communication cannot be performed efficiently and the data communication speed becomes slow.

  The power line communication system of the present invention is a power line communication system that performs power line communication between a first transmission device and a first reception device and between a second transmission device and a second reception device via a power communication line. The first transmission device includes a first reception unit that receives input of first information, a first modulation unit that modulates the first information into a signal having a first frequency, and a signal modulated by the first modulation unit. A first transmission unit that superimposes the voltage on the voltage and transmits the voltage via the power communication line, wherein the first receiver is superimposed on the voltage via the power communication line and transmits at the first frequency. A first separation unit for separating a signal to be processed from a voltage, a first demodulation unit for demodulating the first information separated by the first separation unit, and a first unit for outputting the first information demodulated by the first demodulation unit An output unit, wherein the second transmission device receives a second information input. And a second modulation unit that modulates the second information into a signal having a second frequency that is different from the first frequency, and superimposing the signal modulated by the second modulation unit on the voltage, A second transmission unit configured to transmit a signal transmitted at the second frequency, which is superimposed on the voltage via the power communication line and separated from the voltage. And a second demodulator that demodulates the second information separated by the second separator, and a second output unit that outputs the second information demodulated by the second demodulator. .

  With this configuration, in power line communication, communication between the first transmission device and the first reception device and communication between the second transmission device and the second reception device can be prevented from colliding normally. And it becomes possible to perform power line communication efficiently.

  The power line communication system according to the present invention is the power line communication system, wherein the first transmission device includes the first separation unit, the first information acquisition unit, the first demodulation unit, and the first output unit. The first receiving device is a power communication line system further including the first receiving unit, the first modulating unit, and the first transmitting unit.

  With this configuration, communication between the first transmission device and the first reception device can be bidirectional communication.

  The power line communication system of the present invention is a power line communication that performs power line communication between the first transmission device and the first reception device and between the second transmission device and the second reception device via the power communication line. In the system, the first transmission device receives a first information modulated at a first frequency, and transmits the first information superimposed on a voltage via a power communication line. A first transmission unit, wherein the first reception device is superimposed on a voltage via the power communication line and separates first information transmitted at the first frequency from the voltage; and A second output unit configured to receive second information modulated at a second frequency that is a frequency different from the first frequency; Two information that is superimposed on the voltage and transmitted via the power communication line A second separation unit that separates second information transmitted from the voltage by being superimposed on the voltage via the power communication line and transmitted from the second frequency, and the second information. It is a power line communication system provided with the 2nd output part which outputs.

  With this configuration, in power line communication, communication between the first transmission device and the first reception device and communication between the second transmission device and the second reception device can be prevented from colliding normally. And it becomes possible to perform power line communication efficiently.

  The power line communication system according to the present invention is a power line communication system in which the first information and the second information are information having different attributes in the power line communication system.

  With such a configuration, information of different attributes can be communicated normally and efficiently without causing collision of information of different attributes in power line communication.

  According to the power line communication system of the present invention, power line communication can be performed normally and efficiently between a plurality of devices.

  Hereinafter, embodiments of a power line communication system and the like will be described with reference to the drawings. In addition, since the component which attached | subjected the same code | symbol in embodiment performs the same operation | movement, description may be abbreviate | omitted again.

(Embodiment)
FIG. 1 is a block diagram of a power line communication system in the present embodiment.

  The power line communication system 1 includes a first transmission device 11, a first reception device 12, a second transmission device 21, and a second reception device 22.

  The power line communication system 1 according to the present embodiment is provided between the first transmission device 11 and the first reception device 12 and between the second transmission device 21 and the second reception device 22 via the power communication line 1000. Power line communication.

  The power communication line 1000 is a power line that supplies power used for power line communication. The power used for the power line may be AC or DC. That is, the power line is widely understood. Power line communication is a communication technique for sending a signal using a power line (electrical wiring) such as a power transmission line in a building or outdoors. In power line communication, video and audio signal data is converted into signals of various frequencies such as high-frequency signals and transmitted and received on the power line, that is, superimposed on the voltage, and bidirectional communication is performed. Is possible. Since the configuration of the power communication line 1000 is known, a detailed description thereof will be omitted.

  The first transmission device 11 includes a first reception unit 101, a first modulation unit 102, and a first transmission unit 103.

  The first transmission device 11 receives information such as information output from an information processing device such as a computer, video information and audio information, for example, video information and audio information output from a reproducing device, and performs power communication. A device that outputs to line 1000.

  The first reception unit 101 receives input of first information. The first information is information output from, for example, an information processing device as described above, a device that processes video information or audio information, and the like. However, the first reception unit 101 may receive the first information processed in the first transmission device 11. The first information may be information having any attribute. The attributes described here are a data type, a protocol, a data structure, and the like. For example, the first information may be information whose data type is analog information or digital information. The first information may be text information, video information, or audio information as the data type. Further, the first information may be information transmitted by a predetermined protocol as a protocol used for transmission. The first information may be information having any data structure. The first information is, for example, one or more pieces of information having a predetermined attribute. For example, the first information may be a plurality of digital information transmitted by the TCP / IP protocol. The 1st reception part 101 may receive 1st information how. For example, the first receiving unit 101 may receive analog information by line input or the like. The first receiving unit 101 may receive digital information as information of a predetermined protocol, for example, a TCP / IP protocol via a network such as Ethernet (registered trademark). When the first information is digital information, the first receiving unit 101 can be realized by an interface such as an input interface or a communication interface, or an interface and control software for controlling the interface. For example, when an Ethernet (registered trademark) signal is input to the first reception unit 101 as first information via the Ethernet (registered trademark), for example, an electrical signal used for Ethernet (registered trademark) transmission is The 1st reception part 101 receives and demodulates this electric signal, and obtains the 1st information of a digital signal. In the case of analog information, it is realized by an interface such as an input terminal or an input interface.

  The first modulation unit 102 modulates the first information into a signal having a first frequency. Specifically, the first modulation unit 102 modulates the first information received by the first receiving unit 101 into an analog signal having a first frequency for transmission via the power communication line. When the first information is a digital signal, the first modulation unit 102 also performs a process of converting the digital signal into an analog signal before modulation. The first frequency is a frequency sufficiently higher than the frequency of the signal used for power conveyance for superimposing the first information on the signal used for power conveyance. The frequency described here is a concept including a single frequency, a frequency band indicating a frequency range, a channel, and the like. The first frequency may be a single frequency or frequency band, or may be a plurality of continuous or non-continuous frequencies or frequency bands. The system etc. which the 1st modulation | alteration part 102 modulates 1st information are not ask | required. For example, modulation may be performed by an OFDM (Orthogonal Frequency Division Multiplexing) method or the like. The first frequency may be variable according to a user instruction or the like. In addition, since the process, a structure, an implementation | achievement means, etc. which modulate an analog signal into the signal of a predetermined frequency are well-known techniques, description is abbreviate | omitted. The processing, configuration, and implementation means for modulating a digital signal into an analog signal are well known as D / A converters and the like, and will not be described here.

  The first transmission unit 103 superimposes the signal modulated by the first modulation unit 102 on the voltage and transmits the voltage via the power communication line. For example, the first transmission unit 103 superimposes a signal obtained by modulating the first information by the first modulation unit 102 on a voltage output from a power circuit (not shown), and the superimposed signal is, for example, a power plug or the like To the power communication line 1000. Note that processing and implementation means for superimposing a signal obtained by modulating the first information modulated by the first modulation unit 102 on the voltage by the first transmission unit 103 is a well-known technique in a PLC or the like, and therefore will be described here. Omitted.

  The first receiving device 12 includes a first separation unit 105, a first demodulation unit 106, and a first output unit 107.

  The first receiving device 12 extracts, for example, first information transmitted at a first frequency from signals transmitted by being superimposed on a voltage via the power communication line 1000, and an information processing device such as a computer or the like A device that outputs information such as video information and audio information to a device that outputs information.

  The first separation unit 105 separates the first information, which is superimposed on the voltage via the power communication line 1000 and transmitted at the first frequency, from the voltage. The first separation unit 105 may first separate the signal superimposed on the voltage, and then separate only the first information that is the signal of the first frequency from this signal, or directly from the voltage, the first frequency The first information may be separated. Specifically, the first separation unit 105 is connected to the power communication line 1000 via a power plug (not shown) and the like, receives input of power via the power plug and the like, and from this received power, voltage The first information superimposed on is separated. The 1st information separated here is the 1st information modulated by the signal of the 1st frequency, for example. Note that the processing for separating the signal superimposed on the voltage from the voltage, the realization means, and the like are well-known techniques in the PLC and the like, and thus the description thereof is omitted here. Further, a configuration for extracting information on a desired frequency from a signal is known as a configuration of a band pass filter, a low pass filter, a high pass filter, or the like that selectively passes only a signal of a predetermined frequency, for example. Since it exists, description is abbreviate | omitted here.

  The first demodulator 106 demodulates the first information separated by the first separator 104. Specifically, the first information which is a digital signal or an analog signal modulated and transmitted by the first transmission device 11 is demodulated into first information before modulation. In addition, when the demodulated first information includes information designating the transmission destination device, only the first receiving device 12 corresponding to the information designating the device may acquire the first information. good. The first frequency may be variable according to a user instruction or the like. Note that the configuration for demodulating the modulated digital signal or analog signal is a known technique and will not be described.

  The first output unit 107 outputs the first information demodulated by the first demodulation unit 106. The output described here is a concept including output to an external device (not shown), transmission to an external device, accumulation in a storage medium, and delivery to another module. The external device is an information processing device such as a computer, or a device that outputs video information or audio information such as a television or an audio device. The first output unit 107 may output the first information in any way. For example, analog information may be output by line output or the like. Further, the digital information may be transmitted through a predetermined protocol such as a TCP / IP protocol via a network such as Ethernet. Also, as in this case, when digital information needs to be converted into an analog signal and transmitted, the digital signal may be converted into an analog signal at any time by providing an A / D converter or the like. . When the first information is digital information, the first output unit 107 can be realized by an interface such as an output interface or a communication interface, or an interface and control software for controlling the interface. When digital information needs to be converted into an analog signal and transmitted, the digital signal may be converted into an analog signal as needed by providing an A / D converter or the like. For example, when the first output unit 107 outputs the first information, which is a digital signal, via Ethernet (registered trademark), the digital signal is modulated into an Ethernet (registered trademark) signal, which is an analog signal, and Ethernet (registered) Trademark). Further, when the first information is analog information, it is realized by an interface such as an output terminal or an output interface.

  The second transmission device 21 includes a second reception unit 201, a second modulation unit 202, and a second transmission unit 203.

  For example, the second transmission device 21 receives information such as information output from an information processing device such as a computer, video information and audio information, and outputs information such as video information and audio information output from a device that reproduces power communication. A device that outputs to line 1000.

  The configuration of the second reception unit 201, the second modulation unit 202, and the second transmission unit 203 of the second transmission device 21 is that the second information is received and output instead of the first information, and the second modulation unit. 202, the first receiving unit 101 of the first transmission device 11 described above, except that the second information is modulated with a second frequency different from the first frequency instead of the first frequency described above. Since it has the same configuration as the first modulation unit 102 and the first transmission unit 103, description thereof is omitted here. The “second frequency different from the first frequency” means that the second frequency and the first frequency do not overlap. Moreover, the frequency here is a concept including a single frequency, a frequency band indicating a frequency range, a channel, and the like. The first frequency may be a single frequency or frequency band, or may be a plurality of continuous or non-continuous frequencies or frequency bands. The second information is, for example, one or more pieces of information having a predetermined attribute, and is specifically the same information as the first information. However, it is preferable that the first information and the second information are information having different attributes. By doing in this way, information with different attributes is modulated and transmitted at different frequencies, and collision of information can be prevented. The attribute is different, for example, whether the information is analog information or digital information, the data structure such as the file format of the information is different, or whether the data is text information It means that video information or audio information is different. In addition, it is considered that the attribute is also different here because the protocol in which information is communicated is different. Further, different contents may be considered as different attributes.

  The second reception device 22 includes a second separation unit 205, a second demodulation unit 206, and a second output unit 207.

  For example, the second receiving device 22 takes out first information transmitted at the first frequency from signals transmitted by being superimposed on the voltage via the power communication line 1000, and processes information processing devices such as computers, A device that outputs information such as video information and audio information to a device that outputs information.

  The configuration of the second separating unit 205, the second demodulating unit 206, and the second output unit 207 of the second receiving device 22 is that the second information is demodulated and acquired instead of the first information, and is output. The first separation unit 105 and the first demodulation unit 106 of the first receiving device 12 described above, respectively, except that the two separation unit 205 separates the second information of the second frequency different from the first frequency from the voltage. , And the same configuration as the first output unit 107, the description thereof is omitted here.

  Next, a specific example of the power line communication system will be described. FIG. 2 is a schematic diagram of the configuration of the power line communication system of the present embodiment. Here, a computer 50 is connected to the first reception unit 101 of the first transmission device 11, and a server 60 is connected to the first output unit 107 of the first reception device 12 by Ethernet (registered trademark). And The second receiving unit 201 of the second transmitting device 21 and the line output terminal of the CD player 70 are signal lines, the second output unit 207 of the second receiving device 22, and the audio line of the audio output device 80. It is assumed that the input terminals are connected with signal lines. The audio output device 80 is a device including an amplifier, a speaker, and the like, for example.

  First, it is assumed that the user operates the computer 50 and gives an instruction to the computer 50 to transmit desired digital information to the server 60 using the TCP / IP protocol via Ethernet (registered trademark). In accordance with this instruction, the computer 50 converts the desired digital information to be transmitted into an analog Ethernet (registered trademark) signal, and transmits the analog Ethernet (registered trademark) signal to the first transmitter 11 via the Ethernet (registered trademark). Here, it is assumed that the digital information transmitted by the Ethernet (registered trademark) using the TCP / IP protocol is the first information.

  The first reception unit 101 of the first transmission device 11 receives the first information converted from the computer 50 into an analog signal and transmitted via Ethernet (registered trademark). Then, it is demodulated into digital first information.

  Next, the first modulation unit 102 modulates the first information received by the first receiving unit 101 into an analog signal having a first frequency. Here, it is assumed that the first frequency is designated in advance. For example, here, the first frequency is assumed to be a frequency band of 4 to 28 MHz.

  The first transmission unit 103 transmits the first information modulated by the first modulation unit 102 to the power communication line 1000 by superimposing the first information on the voltage.

  Further, it is assumed that the user operates the CD player 70 to reproduce audio information recorded on the CD. The reproduced analog audio information is output from an audio line output terminal (not shown) of the CD player 70. Here, the analog voice information is assumed to be the second information.

  The second reception unit 201 of the second transmission device 21 receives analog audio information output from the CD player 70.

  Next, the second modulation unit 202 modulates the second information received by the second reception unit 201 into an analog signal having a second frequency. Here, it is assumed that the second frequency is designated in advance. The second frequency is a frequency different from the first frequency. For example, here, it is assumed that the second frequency is a frequency band of 76.7 MHz.

  The second transmission unit 203 transmits the second information modulated by the second modulation unit 202 to the power communication line 1000 by superimposing the second information on the voltage.

  In the first receiving device 12, the first separation unit 105 first acquires a signal superimposed on the voltage supplied to the power communication line 1000 from the voltage. Here, the first separation unit 105 acquires a signal regarding information including the first information and the second information transmitted from the first transmission device 11 and the second transmission device 21.

  Next, the first separation unit 105 selectively acquires only the information of the first frequency from the separated signal. Thereby, only the 1st information which the 1st transmitter 11 modulated and transmitted to the signal of the 1st frequency from the signal which the 1st separation part 105 isolate | separated from the voltage can be isolate | separated and acquired. The second information transmitted at the second frequency is not separated.

  Next, the first demodulator 106 demodulates the first information separated by the first separator 105. The demodulated first information is digital information transmitted by the computer 50.

  Then, the first output unit 107 modulates the first information acquired by the first demodulation unit 106 into an Ethernet (registered trademark) signal and transmits the Ethernet signal to the server 60.

  The server 60 acquires the first information transmitted from the first output unit 107, and performs a predetermined process such as a process of accumulating in a recording medium or the like, or a process of outputting predetermined information.

  It is assumed that the first information transmitted by the computer 50 includes in advance network address information such as the IP address of the server 60 as information for designating the server 60 as a destination. Using the address information, the server 60 may receive only information destined for its own device.

  On the other hand, in the second receiving device 22, the second separation unit 205 separates and acquires the signal superimposed on the voltage supplied to the power communication line 1000 from the voltage. Here, the second separation unit 205 acquires information including the first information and the second information transmitted from the second transmission device 21 and the second transmission device 21.

  Next, the second separation unit 205 selectively acquires only the second frequency information from the separated signal. Thereby, only the 2nd information which the 2nd transmitter 21 modulated and transmitted to the signal of the 2nd frequency from the signal which the 2nd separation part 205 isolate | separated can be isolate | separated. The first information transmitted at the first frequency is not separated.

  Next, the second demodulation unit 206 demodulates the second information separated by the second separation unit 205. The demodulated second information is analog audio information transmitted by the CD player 70.

  Then, the second output unit 207 outputs analog audio information, which is the second information acquired by the second demodulation unit 206, to the audio output device 80 by line output.

  The audio output device 80 receives the analog audio information that is the second information output from the first output unit 107 via the line input terminal, amplifies the input analog audio information, and outputs the audio from a speaker or the like. .

  As described above, according to the present embodiment, in the power line communication, the first information and the second information are respectively modulated to the different first frequency and the second frequency to be transmitted and received. There is no collision with the second information, and between a plurality of devices, here, between the first transmission device 11 and the first reception device 12, and between the second transmission device 21 and the second reception device 22. Thus, power line communication can be performed normally and efficiently.

  In the present embodiment, the case where each of the first transmission device 11, the first reception device 12, the second transmission device 21, and the second reception device 22 is provided is described. May include two or more of at least one of the devices. That is, two or more devices of the same type may be provided. Moreover, the number of the 1st transmitter 11 and the 1st receiver 12 does not need to be the same number, and the number of the 2nd transmitter 21 and the 2nd receiver 22 does not need to be the same.

  Moreover, in this Embodiment, about the case where each communicates between two sets of transmitters and receivers, that is, between the first transmitter 11 and the first receiver 12, and the second transmitter. Although the description has been given of the case where communication is performed between the transmission device 21 and the second reception device 22, the present invention is also applicable to the case where communication is performed between three or more sets of transmission devices and reception devices. is there. That is, the present invention can also be applied to a case where communication is performed between the n-th transmitter (n is an integer from 1 to k, where k is an integer of 2 or more) and the n-th receiver.

  In this case, the n-th transmission device is the same as the first reception unit 101, the first modulation unit 102, and the first transmission unit 103 of the first transmission device 11 described above, the n-th reception unit, the n-th modulation unit, In addition, a configuration including the nth transmitter may be used. However, the n-th transmitter is assumed to receive and output the n-th information instead of the first information, and the n-th modulation unit has the n-th frequency different from the first frequency instead of the first frequency. Two information shall be modulated. The nth frequency is assumed to be different from each other.

  Further, the n-th receiving device is the same as the first separating unit 105, the first demodulating unit 106, and the first output unit 107 of the first receiving device 12, and the n-th separating unit, the n-th demodulating unit, and What is necessary is just to set it as the structure provided with the nth output part. However, the nth receiving device shall output the nth information separated from the voltage instead of the first information, and the nth separation unit outputs the nth information of the nth frequency different from the first frequency from the voltage. Shall be separated.

  FIG. 3 is a diagram illustrating a schematic diagram of an example of a power line communication system when k = 3. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Here, in addition to the first transmission device 11 and the first reception device 12, the power line communication system includes the first transmission device 11a and the first reception device 12a having the same configuration as the first transmission device 11 and the first reception device 12. Will be described. The first transmission device 11 and the first transmission device 11a modulate and output the first information with the first frequency. Moreover, the 1st receiving device 12 and the 1st receiving device 12a acquire the 1st information of a 1st frequency from the signal superimposed on the voltage. In the first transmission device 11a, a first reception unit (not shown) is connected to the Internet via Ethernet (registered trademark) or the like. Further, a modem, a router, or the like may be interposed between the first reception unit and the Internet. In the third transmission device 31, a third reception unit (not shown) is connected to the computer 92.

  In the first receiving device 12, the first output unit 107 is connected to the Internet via Ethernet (registered trademark) or the like. In the first receiver 12a, a first output unit (not shown) is connected to the computer 50 via Ethernet (registered trademark). Further, a modem or a router may be interposed between the first output unit and the Internet. The third receiving device 32 is connected to an LED illumination communication device 94 using LED illumination for performing visible light communication.

  In this system, the first information transmitted by the computer 50 using the TCP / IP protocol is modulated by the first transmission device 11 into a signal having a frequency of 4 to 28 MHz, which is the first frequency, and superimposed on the voltage. This signal is acquired by the first receiving device 12 that extracts the signal of the first frequency, and is output to the Internet. Further, a signal transmitted from the Internet is modulated into a signal of 4 to 28 MHz by the first transmitter 11a, superimposed on the voltage and transmitted to the power communication line 1000, and this signal extracts a signal of the first frequency. It is acquired by the first receiving device 12 a and output to the computer 50. Thereby, the computer 50 can communicate bidirectionally with other computers, servers, etc. (not shown) via the Internet.

  Communication between the CD player 70 and the audio output device 80 is the same as in the above specific example.

  The third information output from the computer 92 is information transmitted by RS232C serial communication, and the third information is transmitted to the third transmission device 31, and the third transmission device 31 has a third frequency. This signal is modulated into a 7 MHz signal, superimposed on the voltage, and transmitted to the power communication line 1000. This signal is acquired by the third receiving device 32 that extracts a third frequency signal, and the LED lighting communication device 94 is serially communicated with RS232C. Is output. The LED illumination communication device 94 transmits information corresponding to the third information transmitted from the third receiving device 32 to other devices (not shown) such as a portable terminal by visible light communication.

  With such a configuration, communication between apparatuses can be performed at three different frequencies from the first to the third.

  FIG. 4 is a diagram showing a first modification of the present embodiment. In the present embodiment, the first transmission device, such as the combination of the first transmission device 11 and the first reception device 12a and the combination of the first transmission device 11a and the first reception device 12 shown in FIG. The first transmitter 13 and the first receiver 14 that combine the first receiver and the first receiver are prepared, and the first transmitter 13 and the first receiver 14 that are combined as shown in FIG. You may make it use for power line communication instead of a transmitter or a 1st receiver. 4, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts. An apparatus such as an information processing apparatus connected to the first receiving unit 101 and the first output unit 107 of the first transmitting device 13 by using the first transmitting device 13 and the first receiving device 14. However, bi-directional communication can be performed between the device connected to the first receiving unit 101 and the first output unit 107 of the first receiving device 14. For example, in FIG. 4, bidirectional communication is possible between the computer 50 and the server 60. Further, in this way, in the first transmission device 13 and the first reception device 14 that combine the first transmission device and the first reception device, the parts that can be shared, for example, an input interface such as Ethernet (registered trademark) and an output interface, May be shared. Also, the second transmission device and the second reception device may be devices combined with the second transmission device and the second reception device, respectively, similar to the first transmission device 13 and the first reception device 14.

  In the present embodiment, the information input to the first transmission device 11 or the second transmission device 21 is input when the information is a signal modulated to the first frequency or the second frequency that can be superimposed on the voltage. In addition, the first modulation unit 102 and the second modulation unit 202 may be prevented from modulating the first information and the second information, or the first modulation unit 102 and the second modulation unit 202 may be omitted. . For example, the first receiving unit 101 and the second receiving unit 201 may receive the modulated first information and second information, respectively. Further, the first output unit 107 and the second output unit 207 may output the modulated first information and second information. Further, in the first receiving device 12 and the second receiving device 22, when it is not necessary to demodulate the first information and the second information separated by the first separating unit 104 and the second separating unit 204, the first demodulating unit 106 and The second information demodulating unit 206 may be omitted.

  FIG. 5 is a diagram showing a second modification of the present embodiment. In FIG. 5, the superimposing device 15 is obtained by omitting the first modulation unit from the first transmitting device 11. Here, it is assumed that, for example, a UHF band television antenna (not shown) for digital terrestrial broadcasting is connected to the first reception unit 101. Further, in the separation device 16, the first demodulation unit 106 is omitted from the first reception device 12. Here, as an example, it is assumed that the first output unit 107 is connected to the antenna connection terminal of the television 55. Further, the separation device 26 is obtained by omitting the second demodulation unit 206 from the second reception device 22. Here, as an example, it is assumed that the second output unit 207 is connected to the antenna connection terminal of the FM radio 75.

  In this modification, when a UHF band radio wave of digital terrestrial broadcasting output from a TV antenna is input to the first reception unit 101, the UHF band signal is superimposed on a voltage by the first transmission unit 103. And transmitted to the power communication line 1000. In the separation device 16, the first separation unit 105 selectively extracts a first frequency, here, a UHF band signal from the voltage, and the first output unit 107 outputs the signal to the television 55. The television 55 receives the UHF band radio wave from the antenna connection terminal and displays the terrestrial digital broadcast.

  When the analog audio information output from the CD player 70 is input to the second reception unit 201, the second modulation unit 202 modulates the analog audio information into an FM band signal that is the second frequency, and the second transmission unit 203 It is superimposed on the voltage and transmitted. In the separation device 26, the second separation unit 205 selectively takes out the FM band signal that is the second frequency from the voltage, that is, the FM band radio wave, and the second output unit 207 outputs the FM band signal to the FM radio 75. . The FM radio 75 receives the FM band radio wave from the antenna connection terminal, and outputs the analog audio information output from the CD player 70.

  In the present embodiment, at least a part of the first transmission device 11 and the first reception device 12, a device that outputs the first information and the second information to the first transmission device 11 and the first reception device 12, etc. You may make it incorporate in the inside of. Similarly, at least a part of the second transmission device 21 or the second reception device 22 may be incorporated in a device or the like that processes the first information and the second information extracted from the power communication line.

  Note that the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, the power line communication system according to the present invention is suitable as a system for performing power line communication, and is particularly useful as a system for performing power line communication between a plurality of devices.

The block diagram of the power line communication system in embodiment of this invention Schematic diagram of the configuration of the power line communication system Schematic diagram of the power line communication system The figure which shows the 1st modification of the power line communication system The figure which shows the 2nd modification of the power line communication system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power line communication system 11, 11a, 13 1st transmission device 12, 12a, 14 1st reception device 15 Superimposition device 16, 26 Separation device 21 2nd transmission device 22 2nd reception device 31 3rd transmission device 32 3rd reception device 50, 92 Computer 55 Television 60 Server 70 CD player 75 FM radio 80 Audio output device 94 LED lighting communication device 101 First reception unit 102 First modulation unit 103 First transmission unit 104 First separation unit 106 First demodulation unit 107 First One output unit 201 Second reception unit 202 Second modulation unit 203 Second transmission unit 204 Second separation unit 206 Second demodulation unit 207 Second output unit 1000 Power communication line

Claims (8)

A power line communication system that performs power line communication between the first transmission device and the first reception device and between the second transmission device and the second reception device via the power communication line,
The first transmitter is
A first reception unit for receiving input of first information;
A first modulator that modulates the first information into a signal of a first frequency;
A first transmission unit that superimposes the signal modulated by the first modulation unit on a voltage and transmits the voltage via a power communication line;
The first receiving device is
A first separator that is superimposed on the voltage via the power communication line and separates the signal transmitted at the first frequency from the voltage;
A first demodulator that demodulates the first information separated by the first separator;
A first output unit that outputs first information demodulated by the first demodulation unit;
The second transmitter is
A second reception unit for receiving input of second information;
A second modulator that modulates second information into a signal of a second frequency that is a frequency different from the first frequency;
A second transmission unit that superimposes the signal modulated by the second modulation unit on a voltage and transmits the voltage via a power communication line, and
The second receiving device is
A second separator that is superimposed on the voltage via the power communication line and separates the signal transmitted at the second frequency from the voltage;
A second demodulator that demodulates the second information separated by the second separator;
A power line communication system comprising: a second output unit that outputs second information demodulated by the second demodulation unit. The first transmitter is
The first separation unit, the first demodulation unit, and the first output unit;
The first receiving device is
The power communication line system according to claim 1, further comprising: the first reception unit, the first modulation unit, and the first transmission unit. A power line communication system that performs power line communication between the first transmission device and the first reception device and between the second transmission device and the second reception device via the power communication line,
The first transmitter is
A first receiving unit for receiving first information modulated to a first frequency;
The first information is superposed on the voltage, and includes a first transmission unit that transmits the power information via a power communication line,
The first receiving device is
A first separation unit that separates from the voltage the first information that is superimposed on the voltage via the power communication line and transmitted at the first frequency;
A first output unit for outputting the first information,
The second transmitter is
A second receiving unit that receives second information modulated by a second frequency that is a frequency different from the first frequency;
The second information is superimposed on the voltage, and includes a second transmission unit that transmits the power information via the power communication line.
The second receiving device is
A second separator that is superimposed on the voltage via the power communication line and separates the second information transmitted at the second frequency from the voltage;
The power line communication system provided with the 2nd output part which outputs said 2nd information. The power line communication system according to any one of claims 1 to 3, wherein the first information and the second information are information having different attributes. The 1st transmitter which comprises the power line communication system of Claims 1-4. The 1st receiver which comprises the power line communication system of Claims 1-4. A power line communication method for communicating first information and second information via a power communication line,
A first receiving step for receiving the input of the first information;
A first modulation step of modulating the first information into a signal of a first frequency;
A first transmission step of superimposing the signal modulated in the first modulation step on a voltage and transmitting the voltage via a power communication line;
A first separation step of separating a signal, which is superimposed on the voltage via the power communication line and transmitted at the first frequency, from the voltage;
A first demodulation step for demodulating the first information separated in the first separation step;
A first output step for outputting the first information demodulated in the first demodulation step,
A second receiving step for receiving the input of the second information;
A second modulation step of modulating the second information into a signal of a second frequency that is a frequency different from the first frequency;
A second transmission step of superimposing the signal modulated in the second modulation step on a voltage and transmitting the voltage via a power communication line;
A second separation step of separating a signal, which is superimposed on the voltage via the power communication line and transmitted at the second frequency, from the voltage;
A second demodulation step for demodulating the second information separated in the second separation step;
A power line communication method comprising: a second output step for outputting second information demodulated in the second demodulation step. A power line communication method for communicating first information and second information via a power communication line,
A first receiving step for receiving first information modulated to the first frequency;
A first transmission step of superimposing the first information on a voltage and transmitting the first information via a power communication line;
A first separation step of separating the first information, which is superimposed on the voltage via the power communication line and transmitted at the first frequency, from the voltage;
A first output step for outputting the first information;
A second receiving step for receiving second information modulated by a second frequency that is a frequency different from the first frequency;
A second transmission step of superimposing the second information on a voltage and transmitting it via a power communication line;
A second separation step of separating from the voltage the second information transmitted at the second frequency superimposed on the voltage via the power communication line;
A power line communication method comprising: a second output step for outputting the second information.

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