CN103490813A - Museum intelligent explanation system based on visible light and power line carrier communication - Google Patents

Abstract

The invention discloses a museum intelligent explanation system based on visible light and power carrier communication, which comprises a remote central control service platform, at least one power bridge, a plurality of power line carrier communication control modules, a plurality of user visible light information moving devices and a plurality of node terminal control modules which are respectively arranged at corresponding cultural relic exhibition information points, wherein the central control service platform is respectively connected with the power bridges through low-voltage power supply lines to realize data bidirectional transmission, each power bridge is respectively connected with the power line carrier communication control modules through the low-voltage power supply lines to realize data bidirectional transmission, and the power line carrier communication control modules are connected with the corresponding node terminal control modules to realize data bidirectional transmission. The invention can meet the LED illumination requirement of museums, can utilize the existing low-voltage power distribution circuit to carry out communication control, and can carry out transmission and control of voice explanation information in real time.

Description

Intelligent explanation system of museum exhibition hall based on visible light and power carrier communication

technical field

The present invention relates to an intelligent explanation system for museum exhibition halls based on visible light and power carrier communication, which belongs to the technical field of short-distance wireless communication and the technical field of power line carrier wired communication.

Background technique

At present, with the rapid advancement of Internet of things (Internet of things) technology and industry, the dream of information exchange anytime and anywhere is gradually being realized. The Internet of Things relies not only on short-distance communication technologies such as Wireless Sensor Network (WSN) and RFID (Radio Frequency Identification), but also on infrastructure such as mobile communication networks and the Internet. Short-distance communication uses radio wave communication. Although this method has been widely used, it has many defects such as harm to the human body, communication equipment is prone to mutual interference, and frequency resources are limited.

In recent years, with the development of new semiconductor high-efficiency and high-brightness white light-emitting diode (LED) manufacturing technology, the luminous efficiency of LED has been gradually improved; and driven by the national energy-saving and emission-reduction policy, its application field has gradually expanded from the display field to the lighting field, and has been recognized. High-speed development. Compared with traditional lighting equipment, white LED is a cold light source, which has the advantages of low power consumption, long life, small size, and environmental protection. It is regarded as the fourth generation of energy-saving and environment-friendly lighting products. Another outstanding advantage of white LEDs is that the response sensitivity is very high, so LEDs can be used for ultra-high-speed short-distance data communication. Visible-Light Communication (VLC) is an emerging short-distance visible light wireless communication technology developed on the basis of white light LED technology.

The low-voltage power line carrier (low Power Line Carrier, PLC) communication mainly uses the low-voltage 220V AC mains power supply line that has been arranged before as the transmission channel for high-frequency communication signals without building a new communication line, which is used to transmit all The required data information, such as remote control signals, voice information, image information, etc., has many advantages such as high transmission rate, power line broadband transmission, no need for special communication wiring, and wide application range. It can realize indoor users to use power lines to make calls, surf the Internet, Remote control and other services. Foreign countries such as the United States, Japan, Israel and other countries are carrying out research and experiments on low-voltage distribution network communication. The "Home Plug Power Line Alliance", a home network promotion group that uses low-voltage power lines as a medium for transmitting information, was jointly established by 13 companies including 3COM, Intel, Cisco, and Panasonic in the United States. Promote digital indoor communication that uses power lines as the medium for transmitting information. In June 2001, the Home Plug Alliance formulated HomePlug 1.0, an indoor power line communication specification, with a theoretical rate of 14Mbps; in December 2005, it formulated Home Plug AV, a data forwarding specification for HDTV and VoIP, with a theoretical rate of 200 Mbps; and from 2009 Started to formulate Home Plug AV 2.0 in March, with a maximum rate of 600Mbps. The "HD-PLC Wavelet OFDM" specification formulated by the "HD-PLC" alliance formed by Panasonic, IO.DATA, AOPEN AMERICA, Advanced Communication Networks SA (CAN), OKI, Murata Manufacturing Co., Ltd. was approved in January 2010. Adopted by the IEEE P1901 committee, it became an international standard; in addition, the broadband PLC specification "G.hn" (50~700Mbps ) was adopted in Geneva, Switzerland on June 15, 2010 and became an international standard. But among many standards, G3 and PRIME are two of the most famous standards, while the G3 standard pays more attention to system robustness, and is a two-way communication standard with an effective data rate of 400Kbps, and allows power line carrier communication signals to pass through low-voltage transformers and distribute to medium-voltage lines, which reduces the connection cost, making power line carrier communication technology a hot spot in today's applications.

Chinese patent document 102868449A discloses an underground wireless communication system based on visible light communication. It only uses the central control center + LED visible light communication controller + power line mode to build an information communication network, which can be used for data transmission within a short distance in the tunnel of the same transformer line. Information and Communication.

Patent documents similar to the above technical solutions include CN102624455A, CN102624451A, CN102752025A, CN202679357U, etc.

The disadvantage of the above-mentioned existing technical solutions is that, in the complex relatively long-distance low-voltage power line communication configuration scenario, during the communication process using the low-voltage power distribution line, the relative distance is relatively long or after the power distribution device, effective communication In the long-distance power line transmission of signals, communication failure or data loss is bound to occur, which will affect the reliability of system communication.

At present, museums basically use stand-alone equipment to explain the cultural relics exhibited. Before the cultural relics are arranged, the staff need to number the arrangement points, and strictly carry out the language input operation for each stand-alone device according to the number. Once the content of the cultural relics explanation needs to To add and modify, it is necessary to re-update each stand-alone device, investing a lot of manpower and time; and users can only listen to the pre-recorded cultural relics explanations by entering the corresponding number when using it. This way of explaining cultural relics brings a lot of inconvenience to users, and also brings a lot of trouble to the management and maintenance of museum explaining equipment. In addition, the general museum is a multi-storey building, the 220V low-voltage power distribution line is relatively complex, and the power distribution line interface socket is relatively far away. If the direct power line carrier communication scheme is used, the data communication may be unreliable. Based on this idea, the present invention proposes an intelligent explanation system for museum exhibition halls that integrates visible light communication technology and low-voltage power line carrier communication technology.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an intelligent explanation system for museum exhibition halls based on visible light and power carrier communication, which can not only meet the LED lighting requirements of museum exhibition halls, but also utilize the existing low-voltage Equipped with power lines for communication control, and real-time transmission and control of voice explanation information, avoiding the use of one-way information transmission to play the explanation content, but not being able to play the explanation content independently for each user in real time, ensuring that each user listens Explain the continuity and independence of the content.

The technical solution adopted by the present invention to solve the above technical problems is: an intelligent explanation system for museum exhibition halls based on visible light and power carrier communication, which includes a remote central control service platform, at least one power network bridge, multiple power line carrier communication control modules and multiple Each user's visible light information mobile device and multiple node terminal control modules respectively arranged at the corresponding cultural relics exhibition information points, the central control service platform is respectively connected to the power network bridge through the low-voltage power distribution line to realize two-way data transmission, each power network bridge Then connect to the power line carrier communication control module through the low-voltage power distribution line to realize two-way data transmission, the power line carrier communication control module is connected to the corresponding node terminal control module to realize data two-way transmission, the node terminal control module and the corresponding The user's visible light information mobile device is connected through visible light signal transmission; wherein,

The user's visible light information mobile device is used to send a visible light signal requesting command information and transmit it to the corresponding node terminal control module, and the node terminal control module detects that the visible light signal is processed and then transmitted to the corresponding power line carrier communication control module , the power line carrier communication control module transmits the modulation to the remote central control service platform through the low-voltage power distribution line and the corresponding power network bridge;

The remote central control service platform then transmits the required explanation data information to the corresponding power line carrier communication control module through the corresponding power network bridge and low-voltage power distribution line according to the request command information, and the power line carrier communication control module demodulates it Pass it to the corresponding node terminal control module, the node terminal control module then forms a visible light signal with the explanation data information and transmits it to the user's visible light information mobile device, and the user's visible light information mobile device independently interprets the explanation data information according to the received visible light signal narration plays.

Further, the node terminal control module includes a node embedded controller module, an LED lighting modulation drive module, an LED lighting unit, a demodulation conversion processing circuit, a signal conditioning and amplification processing unit, a light detection receiving unit, and a corresponding The power line carrier communication control module is used to interface with the power carrier communication interface circuit, the signal output end of the light detection receiving unit is connected to the signal input end of the signal conditioning and amplification processing unit, and the signal output end of the signal conditioning and amplification processing unit is connected to the demodulation The signal input end of the conversion processing circuit is connected, the signal input end of the demodulation conversion processing circuit is connected with the node embedded controller module, the signal input end of the LED lighting modulation drive module is connected with the node embedded controller module, and the LED lighting The signal output terminal of the modulation drive module is connected with the LED lighting unit, and the node embedded controller module is connected with the power carrier communication interface circuit to realize two-way data transmission;

After the light detection and receiving unit detects and receives the visible light signal of the request command information sent by the user’s visible light information mobile device in real time, the carrier signal is removed by the signal conditioning and amplification processing unit and the demodulation conversion processing circuit in turn, and then transmitted to the node embedded controller module After the power line carrier communication frame data is packaged, it is transmitted to the corresponding power line carrier communication control module through the power carrier communication interface circuit;

The power line carrier communication control module transmits the demodulated required explanation data information to the node embedded controller module through the power carrier communication interface circuit to unpack the explanation data information and then transmits it to the LED lighting modulation drive module for modulation control, and then convert the modulated and controlled explanation data information into a visible light signal form through the LED lighting unit and transmit it to the user's visible light information mobile device.

Further, a plurality of power line repeaters are connected in parallel on the low-voltage power distribution line.

Further, the light detection and receiving unit is an array image sensor structure.

Furthermore, the LED lighting unit is an LED lighting unit device with an inverted conical lens.

After adopting above-mentioned technical scheme, the present invention has following beneficial effect:

1. During the working process, the node terminal control module of the present invention can receive in real time information such as the local ID sent by the user’s visible light information mobile device that enters the LED illumination range at the same time, and upload the information to the remote central control through the power line carrier communication control module The service platform makes a corresponding service request, and the remote central control service platform transmits the explanation service content through the power line carrier communication control module according to the service request, controls the visible light LED through the node terminal control module, and sends it back to the user's visible light information mobile device for playback and explanation. The above solution adopted by the invention avoids the one-way information transmission mode used in the prior art to play the explanation content in a loop, but cannot play the explanation content for each user independently in real time, ensuring the continuity of each user's listening to the explanation and independence, it can not only meet the LED lighting needs of the museum exhibition hall, but also use the existing low-voltage power distribution line for communication control, and transmit and control voice explanation information in real time.

2. In the present invention, the combination mode of power network bridge + power line repeater is used to configure the intelligent explanation system of the museum exhibition hall. A power network bridge can be installed on each floor of the museum exhibition hall, and a power line can be installed at an interval of 150 meters for low-voltage distribution power lines. The repeater increases the signal strength of the power line carrier communication and the effective distance of the communication to ensure the reliability and effectiveness of the communication data.

3. In the present invention, the lighting range of the LED lighting unit driven and controlled by each node terminal control module is distributed in the surrounding area of the museum booth in an inverted cone shape to ensure the uniformity and stability of the LED light within the light irradiation range. the

4. In the present invention, the user's visible light information mobile device has a visible light information transmitting unit and a visible light information receiving unit to ensure the continuity and independence of the user's visible light information mobile device in explaining and playing.

5. The present invention can be applied to various indoor spaces such as museums, science and technology museums, and historical memorial halls.

Description of drawings

Fig. 1 is a functional block diagram of an intelligent explanation system for a museum exhibition hall based on visible light and power carrier communication according to the present invention;

Fig. 2 is the functional block diagram of node terminal control module of the present invention;

Fig. 3 is the format of the communication data frame between the user visible light information mobile device of the present invention and the remote central control service platform, wherein the data frame header includes other communication protocol data headers, and the data frame tail also includes other communication protocol data tails;

Figure 4 is a schematic diagram of the museum's indoor exhibition room configuration.

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be described in further detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, an intelligent museum explanation system based on visible light and power carrier communication, which includes a remote central control service platform, at least one power network bridge, multiple power line carrier communication control modules and multiple user visible light information mobile devices And multiple node terminal control modules respectively arranged in the corresponding cultural relics exhibition information points, the central control service platform is respectively connected to the power network bridge through the low-voltage power distribution line to realize two-way data transmission, and each power network bridge is then passed through the low-voltage power distribution line They are respectively connected to the power line carrier communication control module to realize two-way data transmission, the power line carrier communication control module is connected to the corresponding node terminal control module to realize data two-way transmission, and the node terminal control module is connected to the corresponding user visible light information mobile device through Visible light signal transmission mode connection; where,

The user's visible light information mobile device is used to send a visible light signal requesting command information and transmit it to the corresponding node terminal control module, and the node terminal control module detects that the visible light signal is processed and then transmitted to the corresponding power line carrier communication control module , the power line carrier communication control module transmits the modulation to the remote central control service platform through the low-voltage power distribution line and the corresponding power network bridge;

According to the request command information, the remote central control service platform will package the retrieved effective explanation information according to the power line carrier communication standard protocol, and transmit the explanation data information to the corresponding power line carrier communication control through the corresponding power network bridge and low-voltage power distribution line module, the power line carrier communication control module demodulates it and transmits it to the corresponding node terminal control module, and the node terminal control module then forms a visible light signal with the explained data information and transmits it to the user's visible light information mobile device, and the user's visible light information mobile device According to the received visible light signal, the explanation data information will be independently explained and played.

The power network bridge is used for layered and sub-regional control in the multi-storey building of the exhibition hall, and the reliable data communication between the terminal control modules of each layer and node and the remote central control service platform, and the expansion of the network topology of the system data communication.

The remote central control service platform can be connected with other networks through the gateway.

As shown in Figure 2, the node terminal control module includes a node embedded controller module, an LED lighting modulation drive module, an LED lighting unit, a demodulation conversion processing circuit, a signal conditioning and amplification processing unit, a light detection receiving unit, and a The corresponding power line carrier communication control module is used to interface with the power carrier communication interface circuit, the signal output end of the light detection receiving unit is connected to the signal input end of the signal conditioning and amplification processing unit, and the signal output end of the signal conditioning and amplification processing unit is connected to the resolution The signal input end of the modulation conversion processing circuit is connected, the signal input end of the demodulation conversion processing circuit is connected with the node embedded controller module, the signal input end of the LED lighting modulation drive module is connected with the node embedded controller module, and the LED The signal output terminal of the lighting modulation drive module is connected with the LED lighting unit, and the node embedded controller module is connected with the power carrier communication interface circuit to realize two-way data transmission;

The node embedded controller module can use 32-bit STM32 single-chip microcomputer based on ARM-CORTEX-M3 core as the control core. The system hardware circuit becomes extremely simplified, and the system software design workload is reduced.

After the light detection and receiving unit detects and receives the visible light signal of the request command information sent by the user’s visible light information mobile device in real time, the carrier signal is removed by the signal conditioning and amplification processing unit and the demodulation conversion processing circuit in turn, and then transmitted to the node embedded controller module After the power line carrier communication frame data is packaged, it is transmitted to the corresponding power line carrier communication control module through the power carrier communication interface circuit;

The power line carrier communication control module transmits the required explanation data information after demodulation to the node embedded controller module through the power carrier communication interface circuit, unpacks the explanation data information, and then transmits it to the LED lighting modulation driver module for modulation control. Then, the modulated and controlled explanation data information is converted into a visible light signal by the LED lighting unit and transmitted to the user's visible light information mobile device. While illuminating, the LED lighting unit emits visible light signals in a short distance within the illumination range.

There are multiple power line repeaters connected in parallel on the low-voltage power distribution line. Adding power line repeaters between the low-voltage power lines and socket power lines can enhance the signal strength of power line carrier communication and ensure long-distance data communication reliability and communication data quality. . Since the museum is a multi-storey building, a power network bridge is installed on each floor, and the power network bridge + power line repeater solution is used to solve the complex application scenarios of relatively long-distance low-voltage power line communication configuration.

The light detection and receiving unit is an array image sensor structure.

The LED lighting unit is an LED light-emitting unit device with an inverted conical lens, and is powered by a stable constant current source to ensure the consistency of signal strength during visible light communication data transmission and reduce the binary bit error rate of the system.

The information communication between the remote central control service platform and the power line carrier communication control module adopts the narrowband power line carrier communication standard IEEE-P1901.2/G3-FCC for data cable transmission communication.

The optical signal transmission mode between the node terminal control module and the corresponding user visible light information mobile device adopts the multi-ary system frequency shift keying digital modulation mode to modulate information and load it to the illumination light in the LED lighting unit for information transmission interaction.

The LED lighting modulation drive module uses the multi-ary frequency shift keying digital modulation method to modulate the explanation data information;

As shown in Figure 3, the segmented content structure of the explanatory data frame in the communication data format between the user's visible light information mobile device and the remote central control service platform, the explanatory data information of the exhibits is generally large, and it needs to be transmitted during remote transmission Carry out segmented continuous transmission, and carry out the continuous combination and restoration operation of received data in the user's visible light mobile information device. This requires adding a data type field before the data content of the segmented frame to distinguish the transmission content from the command and node number fields to distinguish which node is targeted For transmission operation, the serial number field represents which piece of data information the frame data content is in the segmented data, the data length field represents the length information of the frame data content, and the check code is to verify whether the transmission frame data is correct or not. Other protocol data frame headers and other protocol data frame tails are the content of the frame header and tail format of the power line carrier communication protocol or the frame header and tail format content of the IP communication protocol.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. An intelligent explanation system for museum exhibition halls based on visible light and power carrier communication, characterized in that it includes a remote central control service platform, at least one power network bridge, multiple power line carrier communication control modules and multiple user visible light information mobile devices And multiple node terminal control modules respectively arranged in the corresponding cultural relics exhibition information points, the central control service platform is respectively connected to the power network bridge through the low-voltage power distribution line to realize two-way data transmission, and each power network bridge is then passed through the low-voltage power distribution line They are respectively connected to the power line carrier communication control module to realize two-way data transmission, the power line carrier communication control module is connected to the corresponding node terminal control module to realize data two-way transmission, and the node terminal control module is connected to the corresponding user visible light information mobile device through Visible light signal transmission mode connection; where, The user's visible light information mobile device is used to send a visible light signal requesting command information and transmit it to the corresponding node terminal control module, and the node terminal control module detects that the visible light signal is processed and then transmitted to the corresponding power line carrier communication control module , the power line carrier communication control module transmits the modulation to the remote central control service platform through the low-voltage power distribution line and the corresponding power network bridge; The remote central control service platform then transmits the required explanation data information to the corresponding power line carrier communication control module through the corresponding power network bridge and low-voltage power distribution line according to the request command information, and the power line carrier communication control module demodulates it Pass it to the corresponding node terminal control module, the node terminal control module then forms a visible light signal with the explanation data information and transmits it to the user's visible light information mobile device, and the user's visible light information mobile device independently interprets the explanation data information according to the received visible light signal narration plays. 2. The intelligent interpretation system for museum exhibition halls based on visible light and power carrier communication according to claim 1, characterized in that: the node terminal control module includes a node embedded controller module, an LED lighting modulation drive module, an LED lighting unit, demodulation conversion processing circuit, signal conditioning and amplification processing unit, optical detection receiving unit and power carrier communication interface circuit for interface with the corresponding power line carrier communication control module, the signal output terminal of the optical detection receiving unit and the signal The conditioning is connected to the signal input end of the amplification processing unit, the signal output end of the signal conditioning and amplification processing unit is connected to the signal input end of the demodulation conversion processing circuit, and the signal input end of the demodulation conversion processing circuit is connected to the node embedded controller The modules are connected, the signal input end of the LED lighting modulation drive module is connected with the node embedded controller module, the signal output end of the LED lighting modulation drive module is connected with the LED lighting unit, and the node embedded controller module is connected to the power carrier communication interface Circuits are connected to realize bidirectional data transmission; After the light detection and receiving unit detects and receives the visible light signal of the request command information sent by the user’s visible light information mobile device in real time, the carrier signal is removed by the signal conditioning and amplification processing unit and the demodulation conversion processing circuit in turn, and then transmitted to the node embedded controller module After the power line carrier communication frame data is packaged, it is transmitted to the corresponding power line carrier communication control module through the power carrier communication interface circuit; The power line carrier communication control module transmits the demodulated required explanation data information to the node embedded controller module through the power carrier communication interface circuit to unpack the explanation data information and then transmits it to the LED lighting modulation drive module for modulation control, and then convert the modulated and controlled explanation data information into a visible light signal form through the LED lighting unit and transmit it to the user's visible light information mobile device. 3. The intelligent explanation system for museum exhibition halls based on visible light and power carrier communication according to claim 1, wherein a plurality of power line repeaters are connected in parallel to the low-voltage power distribution line. 4. The intelligent explanation system for museum exhibition halls based on visible light and power carrier communication according to claim 2, characterized in that: the light detection and receiving unit is an array image sensor structure. 5. The intelligent interpretation system for museum exhibition halls based on visible light and power carrier communication according to claim 2, characterized in that: said LED lighting unit is an LED lighting unit device with an inverted conical lens. 6 . The intelligent interpretation system for museum exhibition halls based on visible light and power carrier communication according to claim 1 , wherein the user visible light information mobile device has a visible light information transmitting unit and a visible light information receiving unit.

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