CN102833589B - System and method for audio and video on-demand broadcast based on visible light wireless communication - Google Patents
System and method for audio and video on-demand broadcast based on visible light wireless communication Download PDFInfo
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- CN102833589B CN102833589B CN201210312601.7A CN201210312601A CN102833589B CN 102833589 B CN102833589 B CN 102833589B CN 201210312601 A CN201210312601 A CN 201210312601A CN 102833589 B CN102833589 B CN 102833589B
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Abstract
The invention discloses a system for audio and video on-demand broadcast based on visible light wireless communication. The system comprises an access point, a mobile terminal, an on-demand broadcast control module and an audio and video database, and the access point comprises an information modulation module and a light emitting diode. The mobile terminal comprises an optical receiver, an information retrieval module, a central processing unit, a display control panel and a cellular mobile communication network data transmission module, and an output end of the information modulation module is connected with the light emitting diode. Received optical signals of the light emitting diode are converted into digital signals by the optical receiver through the information retrieval module, and the information retrieval module transmits the digital signals to the central processing unit. The invention further discloses a method for audio and video on-demand broadcast based on visible light wireless communication. By the system and the method, conventional radio frequency communication is replaced by visible light wireless communication, wireless high-speed multimedia information services are provided for users in hot spots, wireless transmission resources of a cellular mobile communication system are saved, and illuminating and communicating are carried out simultaneously.
Description
Technical field
The present invention relates to a kind of radio communication audio/video on-demand system, particularly a kind of audio/video on-demand system based on visible ray radio communication and method.
Background technology
Current mobile Internet develop rapidly, based on the mobile multi-media service of various handheld terminal, proposes more and more higher requirement to the message transmission capability of cellular mobile communication networks.Carry out wireless high-speed Transmitting of Multi-media Information to user, need to take the wireless transmission resources such as a large amount of frequency spectrum, power, bring very large burden at hot zones by cellular mobile communication networks.Also there is no good solution at present, the wireless transmission resources of cellular mobile communication networks can not be taken, for user provides the method for wireless high-speed MMS (Multimedia Message Service).
Summary of the invention
Goal of the invention: in order to solve under the condition substantially not taking cellular mobile communication networks wireless transmission resources, for user provides the problem of wireless real-time audio and video order program service, the invention provides a kind of based on visible ray radio communication audio/video on-demand system and method.
Technical scheme: the invention provides a kind of audio/video on-demand system based on visible ray radio communication, comprise access point, mobile terminal, program request control module and audio, video data storehouse, described access point comprises modulates information module and light-emitting diode, described mobile terminal comprises optical receiver, information recovery module, central processing unit, display control panel and cellular mobile communication networks data transmission module, programme information is passed to data modulation system by cable network by described program request control module, here programme information comprises program request menu information and audio/video information, the programme information of reception is changed into signal of telecommunication control light-emitting diode and sends light signal by modulates information module, the light signal that the light-emitting diode of reception sends is recovered programme information by information recovery module by optical receiver, and programme information is passed to central processing unit, programme information is delivered to display control panel by central processing unit again, program preference information is delivered to cellular mobile communication networks data transmission module by central processing unit by display control panel, program preference information is delivered to cable network by cellular mobile communication networks by cellular mobile communication networks data transmission module, program request control system is delivered to again by cable network, program request control module and audio, video data storehouse are bi-directionally connected Program Transport information.Wherein, described modulates information module is that program information table or audio and video resources are transformed into the signal of telecommunication driving light-emitting diode through digital processing, in order to better realize this function, this module adopts the circuit be made up of components and parts such as on-site programmable gate array FPGAs, its annexation is input program receiving information table or the audio and video resources of FPGA, output connects the first electric capacity C1, the other end of the first electric capacity C1 connects the first resistance R1 and the second resistance R2 respectively, the other end ground connection of the first resistance R1, the other end of the second resistance R2 connects the inverting input of the 5th resistance R5 and the first integrated operational amplifier U1 respectively, the other end of the 5th resistance R5 is connected with the output of the 6th resistance R6 and the first integrated operational amplifier U1 respectively, second electric capacity C2, one end of 3rd resistance R3 and the 4th resistance R4 is connected on the in-phase input end of integrated operational amplifier U1 simultaneously, wherein the second electric capacity C2 and the 4th resistance R4 other end ground connection simultaneously, another termination positive source Vcc of the 3rd resistance R3, the other end of the 6th resistance R6 is connected with one end of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 connects the 7th resistance R7 respectively, the base stage of the 8th resistance R8 and NPN type triode, wherein another termination positive source Vcc of the 7th resistance R7, the other end ground connection of the 8th resistance R8, the emitter of NPN type triode meets the 9th resistance R9, the other end ground connection of the 9th resistance R9, the collector electrode sending and receiving optical diode 12 of NPN type triode.
Described optical information recovers module 22, main being turned by light signal reverts to digital signal, again digital signal is carried out process and revert to program information table or audio and video resources, in order to realize this function, the circuit structure that this module adopts is that the output of optical receiver (21) connects the tenth resistance R10 and the 4th electric capacity C4 respectively, another termination bias voltage Vbias of the tenth resistance R10, the other end of the 4th electric capacity C4 and the 6th electric capacity C6, 13 resistance R13 is connected with the inverting input of the second integrated operational amplifier U3, 6th electric capacity C6 is connected with one end of the 14 resistance R14 and the output of the second integrated operational amplifier U3 with the other end of the 13 resistance R13 simultaneously, the in-phase input end of the second integrated operational amplifier U3 is connected with the 11 resistance R11, one end of 12 resistance R12 and the 5th electric capacity C5, the wherein other end ground connection of the 12 resistance R12 and the 5th electric capacity C5, another termination positive source Vcc of the 11 resistance R11, the other end of resistance R14 connects the 7th electric capacity C7, the other end of the 7th electric capacity C7 connects the inverting input of the 3rd integrated operational amplifier U4 simultaneously, one end of 9th electric capacity C9 and the 17 resistance R17, the other end of the 9th electric capacity C9 and the 17 resistance R17 is connected to one end of the 18 resistance R18 and the output of the 3rd integrated operational amplifier U4 simultaneously, the in-phase input end of the 3rd integrated operational amplifier U4 connects the 8th electric capacity C8, one end of 15 resistance R15 and the 16 resistance R16, wherein another termination positive source Vcc of the 15 resistance R15, the other end ground connection of the 8th electric capacity C8 and the 16 resistance R16, one end of another termination the tenth electric capacity C10 of the 18 resistance R18, its another termination analog to digital converter ADC, the input of the output termination field programmable gate array of transducer ADC.This main circuit will convert light signal to digital signal.
The present invention supports multiple access point co-operation, so access point has one at least.
The conveniently operation of user and use, the preferred touching display screen of display operating panel.
The invention still further relates to opening of a kind of audio/video on-demand and see light wireless communication method, step 1: access point (1) is arranged on for user provides the position of service;
Step 2: by the mode of automatic or manual, arranges the positional information of access point (1) in program request control module (3);
Step 3: according to the positional information of access point in step 2 (1), program request control module (3), by cable network, sends program request menu information to access point (1);
Step 4: access point (1) is received program request menu information and converts light signal to by the modulates information module (11) in access point (1) and light-emitting diode (12), sends out;
Step 5: the optical receiver (21) in mobile terminal (2) and information recovery module (22) recover the program request menu information that access point (1) sends from the light signal received;
Step 6: in mobile terminal (2), the program request menu information received is presented on display control panel (24) by central processing unit (23);
Step 7: central processing unit (23) is according to the selection of user, by cellular mobile communication networks data transmission module (25), program sending user selected is to cellular mobile communication networks, and the selection of user is passed to the last point of arrival of finite element network by cellular mobile communication networks and broadcast control module (3);
Step 8: program request control system (3), according to the selection of user, transfers video file from audio, video data storehouse (4), by cable network, is sent to user place access point (1);
Step 9: access point (1) converts the audio/video information received to light signal, sends;
Step 10: mobile terminal (2) recovers audio/video information from the light signal received, and is transferred on display control panel (24) by central processing unit (23).
Beneficial effect: the present invention utilizes visible ray radio communication to substitute traditional radio communication, in hot spot region for user provides wireless high-speed MMS (Multimedia Message Service), save the wireless transmission resources of cell mobile communication systems, enhance the experience that user uses mobile Internet business.Meanwhile, the visible ray wireless communication technology that the present invention uses also has frequency spectrum and exempts from license, material environmental protection, to human-body safety, without electromagnetic interference, good confidentiality, can communicate while throwing light on and the advantage such as system complexity is low.
Accompanying drawing illustrates:
Fig. 1 is modular structure schematic diagram of the present invention;
Fig. 2 is the circuit theory diagrams of data modulation system and light-emitting diode in access point;
Fig. 3 is the circuit theory diagrams of optical receiver and information recovery system in mobile terminal.
Embodiment:
Below in conjunction with accompanying drawing, technical scheme of the present invention is further explained.
As shown in Figure 1, based on the audio/video on-demand system of visible ray radio communication, comprise access point 1, mobile terminal 2, program request control module 3 and audio, video data storehouse 4, described access point 1 is connected to form by modulates information module 11 and LED 12, and described mobile terminal 2 is connected to form by optical receiver 21, information recovery module 22, central processing unit 23, display control panel 24 and cellular mobile communication networks data transmission module 25.
Access point 1 is arranged on to be needed, for user provides the fixed position of service, after installation, by the mode of automatic or manual, to arrange its positional information in program request control module 3.According to this positional information, program request control module 3, by cable network, sends program request menu information to this access point 1.System supports multiple access point 1, is arranged on different positions.Program request control module 3 can send different program request menu informations to diverse access point 1.After access point 1 receives program request menu information, this modulates information on visible ray, sends by modulates information module 11 wherein and LED 12.Optical receiver 21 in mobile terminal 2 and information recovery module 22 recover the program request menu information that access point 1 sends from the visible ray received.In mobile terminal 2, the program request menu information received is sent on display control panel 24 by central processing unit 23.User selects the audio/video program wanting to receive from program request menu, central processing unit 23 is according to the selection of user, by cellular mobile communication networks data transmission module 25, by the mode of note or mobile data services, the selection of user is sent to cellular mobile communication networks.The selection of user is delivered to cable network through cellular mobile communication networks, then broadcasts control module 3 by the cable network point of arrival.Program request control module 3, according to the selection of user, transfers corresponding file from audio, video data storehouse 4, by cable network, is sent to user place access point 1.The audio/video information received is modulated on visible ray by access point 1, sends.Mobile terminal 2 recovers audio/video information from the visible ray received, and presents to user by display control panel 24.
Modulates information module 11 in access point 1 and the circuit theory diagrams of LED 12 are as shown in Figure 2.Light-emitting diode employing model is the chip of LE UW S2LN, and its luminous flux sent under 350mA electric current is 450lm, and visual angle is 140 degree of optimums.In Fig. 2, first input signal carries out digital processing by field programmable gate array (FPGA), and fpga chip model is XC5VLX50T.Digital processing comprises the steps such as chnnel coding, modulation and framing.Here Viterbi coding and OOK modulation is adopted.The digital signal that FPGA exports directly inputs subsequent conditioning circuit.The integrated operational amplifier of U1 to be model be OPA2674, U1 and peripheral circuit thereof form coupling, filtering and amplifying circuit, mate, filtering and amplification to the output signal of FPGA; The triode of U2 to be model be C1971, U2 and peripheral circuit thereof form the drive circuit of LED.This circuit converts program request menu information and video file to the signal of telecommunication, and control the size of the electric current driving light-emitting diode 12 with this signal of telecommunication, thus change the luminous intensity of light-emitting diode 12.Information is being converted to the modulation technique that adopts in suitable signal of telecommunication process including but not limited to on-off keying (OOK), pulse amplitude modulation (PAM), pulse position modulation (PAM), OFDM (OFDM) and code division multiple access (CDMA).System can be selected to be encrypted the information of transmission, is included in program request control module 3 and is encrypted, is encrypted in modulates information module 11 and is all encrypted in program request control module 3 and modulates information module 11.
Optical receiver 21 in mobile terminal 2 and the circuit theory diagrams of information recovery module 22 are as shown in Figure 3.Optical receiver 21 adopts model to be the PD of SFH203, and its typical case is 5ns change-over time.In Fig. 3, the integrated operational amplifier of U3 and U4 to be all model be OPA657, U3 and U4 and peripheral circuit thereof form two stage filter amplifying circuit, amplify and filtering the current signal that PD exports, then undertaken sampling and quantizing by analog to digital converter (ADC), obtain digital signal.The model of ADC chip is AD9215, sampling rate 65MHz, quantified precision 10 bit.The digital signal that ADC exports, by FPGA process, is carried out synchronously, separates frame, is separated the operations such as mediation channel decoding, outputed signal.Fpga chip model is XC5VLX50T.Light signal will be reverted to program request menu information and video file by this main circuit.
Mobile terminal 2 receives the information that access point 1 is sent.Wherein the luminous intensity received is converted to size of current by optical receiver 21.Optical receiver 21 can adopt photodiode (PD), avalanche photo diode (APD), phototriode, charge-coupled device (CCD) or solar panels.Information recovery module 22 receives the output current of optical receiver 21, therefrom recovers the information that access point 1 sends, and sends central processing unit 23 to and process.When receiving program request menu information, program request menu will be shown on display control panel 24.When receiving audio/video information, play by display control panel 24.
Central processing unit 23 in mobile terminal 2 adopts ARM 2440, and user interface 24 adopts touch display screen, and cellular mobile communication networks data transmission module 25 adopts MC52i to realize.
Claims (4)
1. based on the audio/video on-demand system of visible ray radio communication, comprise access point (1), mobile terminal (2), program request control module (3) and audio, video data storehouse (4), it is characterized in that: described access point (1) comprises modulates information module (11) and light-emitting diode (12); Described mobile terminal (2) comprises optical receiver (21), information recovery module (22), central processing unit (23), display control panel (24) and cellular mobile communication networks data transmission module (25); programme information is passed to modulates information module (11) by cable network by described program request control module (3), the programme information of reception is changed into signal of telecommunication control light-emitting diode (12) and sends light signal by modulates information module (11), the light signal that the light-emitting diode (12) received sends is reverted to programme information by information recovery module (22) by optical receiver (21), and programme information is passed to central processing unit (23), programme information is delivered to display control panel (24) by central processing unit (23) again, program preference information is delivered to cellular mobile communication networks data transmission module (25) by central processing unit (23) by display control panel (24), program preference information is delivered to cable network by cellular mobile communication networks by cellular mobile communication networks data transmission module (25), program request control module (3) is delivered to again by cable network, program request control module (3) and audio, video data storehouse (4) are bi-directionally connected Program Transport information, wherein, described light-emitting diode employing model is the chip of LE UW S2LN, described optical receiver 21 adopts model to be the photodiode of SFH203,
Described modulates information module (11) comprises on-site programmable gate array FPGA, the output of on-site programmable gate array FPGA connects the first electric capacity C1, the other end of the first electric capacity C1 connects the first resistance R1 and the second resistance R2 respectively, the other end ground connection of the first resistance R1, the other end of the second resistance R2 connects the inverting input of the 5th resistance R5 and the first integrated operational amplifier U1 respectively, the other end of the 5th resistance R5 is connected with the output of the 6th resistance R6 and the first integrated operational amplifier U1 respectively, second electric capacity C2, one end of 3rd resistance R3 and the 4th resistance R4 is connected on the in-phase input end of integrated operational amplifier U1 simultaneously, wherein the second electric capacity C2 and the 4th resistance R4 other end ground connection simultaneously, another termination positive source Vcc of the 3rd resistance R3, the other end of the 6th resistance R6 is connected with one end of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 connects the 7th resistance R7 respectively, the base stage of the 8th resistance R8 and NPN type triode, wherein another termination positive source Vcc of the 7th resistance R7, the other end ground connection of the 8th resistance R8, the emitter of NPN type triode meets the 9th resistance R9, the other end ground connection of the 9th resistance R9, the collector electrode sending and receiving optical diode LED(12 of NPN type triode),
Described information recovery module (22) comprises the tenth resistance R10, 4th electric capacity C4 and the second integrated operational amplifier U3, one end of tenth resistance R10 is connected with the 4th electric capacity C4, another termination bias voltage Vbias of the tenth resistance R10, the other end of the 4th electric capacity C4 and the 6th electric capacity C6, 13 resistance R13 is connected with the inverting input of the second integrated operational amplifier U3, 6th electric capacity C6 is connected with one end of the 14 resistance R14 and the output of the second integrated operational amplifier U3 with the other end of the 13 resistance R13 simultaneously, the in-phase input end of the second integrated operational amplifier U3 is connected with the 11 resistance R11, one end of 12 resistance R12 and the 5th electric capacity C5, the wherein other end ground connection of the 12 resistance R12 and the 5th electric capacity C5, another termination positive source Vcc of the 11 resistance R11, the other end of resistance R14 connects the 7th electric capacity C7, the other end of the 7th electric capacity C7 connects the inverting input of the 3rd integrated operational amplifier U4 simultaneously, one end of 9th electric capacity C9 and the 17 resistance R17, the other end of the 9th electric capacity C9 and the 17 resistance R17 is connected to one end of the 18 resistance R18 and the output of the 3rd integrated operational amplifier U4 simultaneously, the in-phase input end of the 3rd integrated operational amplifier U4 connects the 8th electric capacity C8, one end of 15 resistance R15 and the 16 resistance R16, wherein another termination positive source Vcc of the 15 resistance R15, the other end ground connection of the 8th electric capacity C8 and the 16 resistance R16, one end of another termination the tenth electric capacity C10 of the 18 resistance R18, another termination analog to digital converter ADC of the tenth electric capacity C10, the input of the output termination on-site programmable gate array FPGA of analog to digital converter ADC.
2. the audio/video on-demand system based on visible ray radio communication according to claim 1, is characterized in that: described access point (1) has at least one.
3. the audio/video on-demand system based on visible ray radio communication according to claim 1, is characterized in that: described display control panel (24) is touch display screen.
4., based on an audio/video program request method for visible ray radio communication, comprise the steps:
Step 1: access point (1) is arranged on for user provides the position of service;
Step 2: by the mode of automatic or manual, arranges the positional information of access point (1) in program request control module (3);
Step 3: according to the positional information of the access point (1) in step 2, program request control module (3), by cable network, sends program request menu information to access point (1);
Step 4: the modulates information module (11) in access point (1) and light-emitting diode (12) convert the program request menu information that access point (1) receives to light signal, send to mobile terminal (2);
Step 5: the optical receiver (21) in mobile terminal (2) and information recovery module (22) recover the program request menu information that access point (1) sends from the light signal received;
Step 6: in mobile terminal (2), the program request menu information received is presented on display control panel (24) by central processing unit (23);
Step 7: central processing unit (23) is according to the selection of user, by cellular mobile communication networks data transmission module (25), the selection of user is sent to cellular mobile communication networks, and the selection of user is passed to the last point of arrival of cable network by cellular mobile communication networks and is broadcast control module (3);
Step 8: program request control system (3), according to the selection of user, transfers audio/video information from audio, video data storehouse (4), by cable network, is sent to access point (1);
Step 9: access point (1) converts the audio/video information received to light signal, sends to mobile terminal (2);
Step 10: mobile terminal (2) recovers audio/video information from the light signal received, and is transferred on display control panel (24) by central processing unit (23);
Wherein, the method that the program request menu information that access point (1) receives by described modulates information module (11) and light-emitting diode (12) or audio/video information convert light signal to is: convert program request menu information or audio/video information to the signal of telecommunication, and control with this signal of telecommunication the size of current driving light-emitting diode (12), thus change the luminous intensity of light-emitting diode (12);
In described step 3, the quantity of access point (1) has multiple, and program request control module (3), by cable network, sends program request menu information respectively to diverse access point (1).
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103684597A (en) * | 2013-11-19 | 2014-03-26 | 北京邮电大学 | FPGA-based visible light video communication system and method |
| EP3226442A1 (en) * | 2014-09-18 | 2017-10-04 | Sisoft De Mexico, S.A. De C.V. | Design and configuration of a system for the bidirectional communication of digital data through the visible light spectrum, in a non-confined medium |
| CN108401144A (en) * | 2017-02-06 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of terminal control method and device, mobile terminal and synchronous display systems |
| CN106991331A (en) * | 2017-03-29 | 2017-07-28 | 维沃移动通信有限公司 | A kind of data ciphering method and mobile terminal |
| CN111082864A (en) * | 2019-11-20 | 2020-04-28 | 安徽中骄智能科技有限公司 | Integrated circuit of visible light communication system transmitting module |
| CN112821951A (en) * | 2021-01-06 | 2021-05-18 | 天津戎行集团有限公司 | Visible light communication terminal equipment for LED in hole or underground tunnel |
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