CN104104439A - Examination listening broadcasting system based on visible light communication - Google Patents
Examination listening broadcasting system based on visible light communication Download PDFInfo
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- CN104104439A CN104104439A CN201410334623.2A CN201410334623A CN104104439A CN 104104439 A CN104104439 A CN 104104439A CN 201410334623 A CN201410334623 A CN 201410334623A CN 104104439 A CN104104439 A CN 104104439A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to an examination listening broadcasting system based on visible light communication. The examination listening broadcasting system comprises an information source, an LED lamp and an audiovisual device, and further comprises a PPM coding module, an LED drive circuit, a photoelectric detection circuit, a signal amplification regulation circuit, a demodulation module, an FPGA processing platform I and a PFGA processing platform II. The information source is inputted to the PPM coding module. The PPM coding module is connected with the LED drive circuit. The LED drive circuit is connected with the LED lamp. A light source signal sent by the LED lamp is transmitted to a photoelectric detector which is connected with the signal amplification regulation circuit. The signal amplification regulation circuit is connected with the demodulation module which is connected and outputted to the audiovisual device. The transmitting end of the FPGA processing platform I is connected with the PPM coding modulation module of a control signal. The transmitting end of the FPGA processing platform II is connected with the demodulation module. By means of the application of the LED visible light source in the system, power consumption is low, the service life is long, the examination listening broadcasting system is green and environmentally friendly, capable of saving energy and large in communication capacity, and secrecy and security of data are improved when the examination listening broadcasting system is applied to examination .listening broadcasting.
Description
Technical field
The present invention relates to optical communication system, particularly a kind of examination hearing broadcast system based on visible light communication.
Background technology
The later stage nineties 20th century, development and the requirement of people to high-speed radio broadband connections along with all optical access technology, a kind of information capacity is large, dispose flexible, easy to maintenance, safe and secret wireless light communication technology, obtained people's very big concern, the rapid deployment that it is WiMAX access provides a kind of solution flexibly, and its range of application marches toward civil area from military and space industry.
In recent years, the LED lighting technology development that is described as " green illumination " is swift and violent, utilize the luminescence response characteristic that LED device can high speed light on and off, modulate the signal on LED visible ray and transmit, visible light communication is combined with LED illumination, construct LED illumination and the dual-purpose base station lamp of communicating by letter, can be optical communication a kind of brand-new broadband access method is provided.
LED visible ray radio network has been realized LED illumination and radio communication double effects, without using extra electric energy and equipment to carry out short-distance wireless communication.Secondly, visible light communication transmitting power is high, without radio-frequency spectrum authentication, can provide a kind of brand-new high-speed data access way.Transmission for data is realized by the LED light beam through ovennodulation, and by PIN diode, is realized the detection of high frequency light pulse, and through adjusting after amplification, recycling FPGA realizes the demodulation of pulse signals, thereby realizes transfer of data at a high speed.
Light wireless communication system adopts baseband modulation, and the modulator approach that is applicable at present indoor visible LED communication has: on-off keying; Pulse position modulation; Multi-pulse position modulation; Difference pulse-width modulation; Digit pulse interval modulation; Double end pulse spacing width modulated.In general, no matter adopt which kind of modulator approach, its objective is in order to obtain higher power utilization, relatively narrow bandwidth, higher bandwidth availability ratio and the lower error rate.In the present invention, adopting PPM modulation system is one of good modulator approach of current wireless light communication, and its power utilization and band efficiency are all relatively good, thereby is recommended to encode for the wireless light communication of 0-10MHz by the IEEE802.11 committee.
On the other hand, examination in school, particularly English exam needs hearing test, yet the examination of traditional English Listening Comprehension is the radio propagation of use, need wireless transmission device, and wireless sending zone is wider, cause examination content to be easy to be received by the external world, there are cheating or other relevant issues.Most importantly on existing market, about LED lamp, use field too narrow, use too singlely, also do not relate to the utilization in broadcast communication system.
Summary of the invention
The present invention uses in order to solve LED lamp visible light source the problem that system is too single and listening existence in campus is practised fraud, proposed a kind ofly based on LED lamp visible light source, can be used in the visual light source examination hearing broadcast system in English exam hearing broadcast, it is extremely low that this system has power consumption, long service life, the many advantages such as environmental protection.
The present invention is in order to solve the problem of prior art; a kind of examination hearing broadcast system based on visible light communication is provided; comprise information source, LED lamp, audio-visual equipment; this system also comprises that PPM coding module, LED drive circuit, photoelectric detective circuit, signal amplify Circuit tuning, demodulation module, FPGA processing platform I, FPGA processing platform II; Described information source is input to PPM coding module, and described PPM coding module is connected with LED drive circuit, and described LED drive circuit is connected with LED lamp; By LED lamp, send light signal and be delivered to photoelectric detector, described photoelectric detector amplifies adjusting module with signal and is connected, and described signal amplifies Circuit tuning and is connected with demodulation module, and described demodulation module connection outputs to audio-visual equipment; The PPM code modulation module of described FPGA processing platform I transmitting terminal connection control signal; Described FPGA processing platform II transmitting terminal connects demodulation module.
As to further restriction of the present invention, described photoelectric detector has PIN photodiode.Thus, photoelectric detector is used in receiving optical signals, and the signal of telecommunication corresponding to light signal converts to, and PIN photodiode is photo-detector conventional in optical communication, and the light that can send LED lamp is surveyed.
As to further restriction of the present invention, described signal amplifies Circuit tuning the small-signal of photoelectric detector is carried out to voltage amplification, level adjustment, and filtering noise disturbs, the circuit of the error rate while reducing system communication; Thus, by signal, amplifying Circuit tuning can amplify and adjust to hearing and broadcast suitable scope signal.
As to further restriction of the present invention, described audio-visual equipment comprises earphone and other audio-visual equipment.Thus, student can be received and be listened force signal by earphone, by display device, watches.
As to further restriction of the present invention, described earphone has dedicated IC chip.Thus, improve the reception of earphone.
Useful technique effect of the present invention: by using FPGA processing platform module to realize the modulation signal of PPM coding module, directly control the drive circuit of LED lamp, realize the flicker of LED lamp, the PIN photodiode that adopts photoelectric detector to have is accepted light signal, and change into the signal of telecommunication, by Waveform adjusting circuit, after input FPGA processing platform module II, to transmission decoding data, and finally connect audio-visual equipment; This system employs can be transmitted by visible ray in the hearing broadcast of campus English examination, particularly can prevent that examinee from using special earphone to receive signal, in assurance examination hall, examinee can normally receive to broadcast and listen force signal, also prevent that the people beyond examination hall from receiving hearing broadcast singal, thereby can stop listening cheating, improve confidentiality and fail safe.
Accompanying drawing explanation
Fig. 1 is a kind of examination hearing broadcast system schematic diagram based on visible light communication of the present invention.
In figure: information source 1, LED lamp 12, audio-visual equipment 7, this system also comprises that PPM coding module 2, LED drive circuit 3, photoelectric detector 4, signal amplify Circuit tuning 5, demodulation module 6, FPGA processing platform I 8, FPGA processing platform II 9.
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embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The examination hearing broadcast system based on visible light communication of the present invention as shown in Figure 1, comprise information source 1, LED lamp 12, audio-visual equipment 7, this system also comprises that PPM coding module 2, LED drive circuit 3, photoelectric detector 4, signal amplify Circuit tuning 5, demodulation module 6, FPGA processing platform I 8, FPGA processing platform II 9; Described information source 1 is input to PPM coding module 2, described PPM coding module 2 is connected with LED drive circuit 3, described LED drive circuit 3 is connected with LED lamp 12, by LED lamp 12, send visible light source signal and be delivered to photoelectric detector 4, described photoelectric detector 4 amplifies adjusting module 5 with signal and is connected, described signal amplifies Circuit tuning 5 and is connected audio-visual equipment 7 with demodulation module 6, and described signal to amplify Circuit tuning be that small-signal for photoelectric detector carries out voltage amplification, level adjustment, and filtering noise interference, the circuit of the error rate while reducing system communication.Described FPGA processing platform I 8 control connection PPM code modulation modules 2, described FPGA processing platform II 9 control connection demodulation modules 6, described photoelectric detector 4 has PIN photodiode.
Wherein, LED drive circuit 3 in native system is related to the error rate and the transmission rate of whole communication system, by optimizing drive circuit, can reach the high-speed transfer of data, mainly by the signal of FPGA processing platform I 8 outputs, realize the function of a LED drive circuit switch, thereby realize the control to LED drive circuit 3, i.e. the control of LED lamp 12 light on and off.
The LED illuminator of one of above-mentioned major technique becomes the illuminator of main flow gradually in modern society, very general for the LED light source of LED lamp 12 visible ray radio communications, in illumination, realizes radio communication, has also greatly reduced the consumption of the energy.Along with popularizing of mobile terminal, will carry out more and more frequently radio communication.The feature of LED visible ray radio communication " safety, energy-conservation, environmental protection ", makes this technology be easy to be accepted by popular colony.Meanwhile, the examination hearing broadcast system of visible light communication can be widely used in the radio broadcasting of school examination's hearing system, and the wireless communication system of other short-distance wireless transfer of data.
Again, the light signal that LED lamp 12 in native system produces all can be subject to the interference of various noise in transmission and a series of processing procedure, cause photelectric receiver correctly to receive small-signal very difficult, the electromagnetic interference etc. of environment of coming from the outside can be weakened or be prevented by the mode of shielding, but the random noise of internal system is inevitable, can only reduce by circuit design and manufacture craft measure as far as possible.So signal adjustment circuit must play a key effect aspect inhibition electromagnetic interference and noise effect, and then avoid occurring that the situation that signal is buried in noise occurs; Wherein, optical communication is that the imperceptible high speed light and shade of the naked eyes flash signal of utilizing LED lamp 12 to send is carried out transmission of information.Advantage that can fast modulation by LED lamp 12 guaranteed to utilize it carries out Ultrahigh speed data communication may, its detailed process is that transmitting terminal encodes the data of needs transmission, modulate, then be loaded in visible ray carrier signal and launch, receiving terminal utilizes electrooptical device to receive optical carrier, and carries out demodulation to obtain raw information with FPGA.
In sum, LED lamp not only power consumption is extremely low, and has the many advantages such as long service life, environmental protection.Along with the raising of luminous efficiency, high-brightness LED lamp will expand to daily life lighting field gradually from specialty demonstration field, very likely will substitute the new generation of green light source that conventional illumination device becomes 21 century.And when LED lamp is in order to illumination or demonstration, carry out transfer of data, and visible light communication and LED illumination are combined, will become a brand-new developing direction of communication mode, will more be conducive to the reduction of energy consumption, the protection of environment.Along with the raising of luminous efficiency, high-brightness LED will expand to daily life lighting field gradually from specialty demonstration field, can substitute the new generation of green light source that conventional illumination device becomes 21 century.And when LED lamp is in order to illumination or demonstration, carry out transfer of data, and visible light communication and the illumination of LED lamp are combined, be the development of communication mode of new generation, be more conducive to the reduction of energy consumption, the protection of environment.
Say further, LED lamp has also comprised plurality of advantages: (1) is energy-conservation: LED lamp is that electro-optical efficiency is high, energy-conservation, reliable, the new generation of green illuminating product of long service life for having of generally acknowledging at present, LED lighting technology and optical communication technique are combined, realize making full use of of resource, greatly reduced energy consumption, be significant.(2) message capacity is large: white light LEDs, as semiconductor device, has the advantages that response speed is high, modulating performance is good, can be used for high speed data transfer.The brightness of white light LEDs is very high, and modulation rate is very fast, and human eye cannot be experienced the flicker of light, therefore, is guaranteeing, under the condition of illumination, can to realize high speed data transfer.(3) safety: traditional optical communication is to utilize invisible light to communicate transmission is to adopt the longer infrared light of wavelength mostly.Compare Radio infrared communication, visible ray is green resource, does not have electromagnetic radiation, to not injury of human body.(4) economic benefit has a extensive future: use LED visible ray to carry out radio communication, reduce the required external equipment of Wireless Data Transmission, greatly reduce transfer of data cost.Meanwhile, LED lighting technology is that the form with visible ray dissipates by most of energy, only has the power conversion of small part to become heat.Meanwhile, we have realized again the making full use of of visible ray, and after coming into operation in batches, just can produce huge economic benefit.
Native system FPGA processing platform I 8 is controlled PPM modulation module 2, and information source is transformed into the transmission of PPM signal, by LED drive circuit 3 transmitting PPM signals.Use FPGA processing platform II 9 to transmit the demodulation of data.FPGA processing platform I 8 and FPGA processing platform II 9 are field programmable logic module, have the features such as low in energy consumption, speed is fast, more can improve system transmission rate, and anti-interference is stronger, is adapted to the communication system harsh to rate request; Above-described is only elaboration to embodiments of the present invention; it should be pointed out that for the person of ordinary skill of the art, do not departing under the prerequisite of creation design of the present invention; can also make other distortion and improvement, these all belong to protection scope of the present invention.
Claims (5)
1. the examination hearing broadcast system based on visible light communication, comprise information source, LED lamp, audio-visual equipment, it is characterized in that: this system also comprises that PPM coding module, LED drive circuit, photoelectric detective circuit, signal amplify Circuit tuning, demodulation module, FPGA processing platform I, FPGA processing platform II; Described information source is input to PPM coding module, and described PPM coding module is connected with LED drive circuit, and described LED drive circuit is connected with LED lamp; By LED lamp, send light signal and be delivered to photoelectric detector, described photoelectric detector amplifies adjusting module with signal and is connected, and described signal amplifies Circuit tuning and is connected with demodulation module, and described demodulation module connection outputs to audio-visual equipment; The PPM code modulation module of described FPGA processing platform I transmitting terminal connection control signal; Described FPGA processing platform II transmitting terminal connects demodulation module.
2. the examination hearing broadcast system based on visible light communication as claimed in claim 1, is characterized in that: described photoelectric detector has PIN photodiode.
3. the examination hearing broadcast system based on visible light communication as claimed in claim 1, it is characterized in that: described signal amplifies Circuit tuning, for the small-signal of photoelectric detector is carried out to voltage amplification, level adjustment, and filtering noise interference, the error rate while reducing system communication.
4. the examination hearing broadcast system based on visible light communication as claimed in claim 1, is characterized in that: described audio-visual equipment comprises earphone or other audio-visual equipment.
5. the examination hearing broadcast system based on visible light communication as claimed in claim 4, is characterized in that: described earphone has dedicated IC chip.
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| CN201410334623.2A CN104104439A (en) | 2014-07-15 | 2014-07-15 | Examination listening broadcasting system based on visible light communication |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601235A (en) * | 2014-12-31 | 2015-05-06 | 青岛黄海学院 | Audio signal visible light transmitting device |
| CN105721054A (en) * | 2014-12-23 | 2016-06-29 | 中国人民解放军装甲兵工程学院 | Information demodulation terminal used for indoor wireless optical communication |
| CN105898248A (en) * | 2014-12-23 | 2016-08-24 | 中国人民解放军装甲兵工程学院 | Optical information field-based indoor electrical appliance signal wireless optical communication system |
| CN105898249A (en) * | 2014-12-23 | 2016-08-24 | 中国人民解放军装甲兵工程学院 | Optical information field-based indoor video signal wireless optical communication system |
| CN105898250A (en) * | 2014-12-23 | 2016-08-24 | 中国人民解放军装甲兵工程学院 | Optical information field module for indoor wireless optical communication |
| CN108133631A (en) * | 2017-12-29 | 2018-06-08 | 佛山市幻云科技有限公司 | Nonpaperlized examination server, system and method |
| CN108242188A (en) * | 2017-12-29 | 2018-07-03 | 佛山市幻云科技有限公司 | Examination system and method based on visible light communication |
| CN108683455A (en) * | 2018-07-06 | 2018-10-19 | 黑龙江大学 | Infrared output device is debugged in MCVF multichannel voice frequency in indoor LED illuminating lamp |
| CN111181635A (en) * | 2020-01-13 | 2020-05-19 | 中航海信光电技术有限公司 | Free space optical communication test system and method |
| CN112636829A (en) * | 2020-09-24 | 2021-04-09 | 中煤科工开采研究院有限公司 | Wireless communication data transmission device for coal mining working face of coal mine |
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| CN111181635A (en) * | 2020-01-13 | 2020-05-19 | 中航海信光电技术有限公司 | Free space optical communication test system and method |
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Application publication date: 20141015 |