CN111817783A - Signal distribution system based on visible light communication - Google Patents
Signal distribution system based on visible light communication Download PDFInfo
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- CN111817783A CN111817783A CN202010644158.8A CN202010644158A CN111817783A CN 111817783 A CN111817783 A CN 111817783A CN 202010644158 A CN202010644158 A CN 202010644158A CN 111817783 A CN111817783 A CN 111817783A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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Abstract
The invention provides a signal distribution system based on visible light communication, which comprises a transmitter and a plurality of receivers for receiving visible light transmitted by the transmitter, wherein the transmitter comprises a transmitter main controller and a signal transmitting circuit, the transmitter main controller is used for selecting, coding and modulating input information, the transmitter main controller is connected with the signal transmitting circuit, and the system distributes sound information and character information in a visible light communication mode; meanwhile, the system is combined with LED illumination, so that transmitted information is not influenced by electromagnetic interference, the illumination function is considered, audio and character transmission can be carried out simultaneously, and unnecessary energy waste is avoided.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a signal distribution system based on visible light communication, which realizes the distribution of one transmitter corresponding to a plurality of receivers.
Background
Visible Light Communication (VLC) technology is a novel Communication technology developed on the basis of LED lighting, utilizes indoor lighting equipment to replace Communication modes such as wireless local area network, and has the advantages of high transmission power, no occupation of radio frequency spectrum, no electromagnetic interference, wide bandwidth, high safety, good privacy and the like. The visible light communication can be used for indoor wireless access due to the advantages, has obvious advantages for larger access equipment number, can also provide a brand new method for the mobile navigation and positioning of urban vehicles, and has wide application prospect.
With the development of energy saving and miniaturization of indoor lighting equipment, LEDs with many advantages of high efficiency, high brightness, long lifetime, low power consumption, etc. have been increasingly applied to the field of lighting, gradually replacing traditional fluorescent lamps and incandescent lamps, and becoming a new generation of lighting source. As a visible light communication technology closely combined with an illumination technology, the popularization of LEDs and the characteristic that LEDs themselves are easily modulated also make it possible to apply visible light communication.
The current visible light communication technology has a certain application prospect in the civil fields of supermarket shopping guide, museum explanation, wireless high-speed interconnection and the like, and the research on the related technology and application thereof is carried out at home and abroad, but the related products based on the visible light communication technology are still rare in the market at present.
Disclosure of Invention
The scheme provides a signal distribution system based on visible light communication, which is used for distributing sound information and character information in a visible light communication mode; meanwhile, the system is combined with LED illumination, so that transmitted information is not influenced by electromagnetic interference, the illumination function is considered, audio and character transmission can be carried out simultaneously, and unnecessary energy waste is avoided.
The scheme is realized by the following scheme: a signal distribution system based on visible light communication comprises a transmitter and a plurality of receivers for receiving visible light emitted by the transmitter, wherein the transmitter is used for sending information through a visible light beam, the receivers are used for receiving the visible light and converting the visible light into corresponding information to be displayed or played through audio, and one transmitter can correspond to the plurality of receivers. The number of the receiving devices can be increased or decreased according to needs, meanwhile, the transmitter does not need to be correspondingly adjusted, plug and play of the transmitter and the receiver is really achieved, various application scenes can be flexibly adapted, the use cost and the difficulty are reduced, the deployment efficiency is high, and meanwhile, compared with a communication mode based on a network, the number of the receiving devices does not influence the propagation quality and the efficiency.
The transmitter comprises a transmitter main controller and a signal transmitting circuit, wherein the transmitter main controller is used for selecting, coding and modulating input information, the transmitter main controller is connected with the signal transmitting circuit, the signal transmitting circuit comprises a transmitting filter used for limiting the bandwidth of an analog signal, a preamplifier used for amplifying the filtered signal, an LED driving circuit used for improving the signal power and realizing optical modulation, and an LED lamp used for transmitting visible light, the LED lamp is connected with the LED driving circuit, the LED driving circuit is connected with the transmitting filter through the preamplifier, the transmitting filter is connected with the transmitter main controller, the transmitter main controller can adopt a single chip microcomputer, and the transmitter main controller is connected with a plurality of signal input ports. After receiving the information, the main controller of the transmitter encodes and modulates the information to be transmitted, adds identification information to position the information and marks the type of the transmitted information; and then the modulated signal is converted into an analog signal, the bandwidth is limited by a sending filter, the signal is amplified by a preamplifier, and then the electric signal is converted into an optical signal by an LED driving circuit and is emitted by an LED lamp.
The receiver comprises a signal receiving circuit and a receiver main controller which is used for demodulating, sampling and extracting the original signal of the transmitter from the digital signal, and the signal receiving circuit is connected with the receiver main controller; the signal receiving circuit comprises a photosensitive element for capturing information-carrying visible light, a pre-filter for filtering out signal out-band noise and improving signal to noise ratio, and a small signal amplifier for amplifying power of the filtered signal, wherein the photosensitive element is connected with the pre-filter, the pre-filter is connected with a receiver main controller through the small signal amplifier, the receiver main controller is connected with a signal output module, and the receiver main controller can adopt a single chip microcomputer. The photoelectric diode is used for receiving optical signals, conversion of the optical signals and the electric signals is achieved, interference and noise outside a signal band are filtered by the converted electric signals through the pre-filter, the signals are amplified and converted into digital signals through the small signal amplifier and then input into the receiver main control controller, the receiver main control controller demodulates and samples the received digital signals, and original signals transmitted by the transmitter are extracted from the digital signals.
The signal input interface includes the audio input interface that is used for connecting microphone or external sound source and is used for connecting host computer USB interface, audio input interface and USB interface have transmitter owner controller to connect respectively, transmitter owner controller with be used for selecting the information source or input the keyboard connection of the information that will transmit, transmitter owner controller still with be used for showing the signal source or the display screen connection of conveying information. The USB interface is used for connecting an upper computer; the audio input interface is used for connecting a microphone or an external sound source; the display screen and the keyboard are used for realizing the man-machine interaction function, and a user can select an information source through the keyboard or manually input information to be transmitted and obtain corresponding feedback on the display screen.
The signal output module is including being used for converting digital speech signal into the digital analog converter of analog audio frequency, a speech synthesis module for converting the characters into analog sound, a dot matrix drive circuit for converting the characters into the LED lamp dot matrix, an audio power amplifier module for driving the speaker to play sound, receiver main controller respectively with digital analog converter, the speech synthesis module, dot matrix drive electric power is connected, digital analog converter, the speech synthesis module is connected with audio power amplifier module respectively, audio power amplifier module is connected with the speaker, dot matrix drive circuit is connected with LED dot matrix screen. The receiver main controller judges the type of the original signal transmitted by the transmitter through the identification information in the original signal and sends the original signal to different secondary circuits according to different conditions, if the original signal is a voice signal, the receiver main controller sends the signal to a digital-to-analog converter to be converted into an analog signal, and the analog signal is amplified through an audio power amplifier and then is played through a loudspeaker; if the original signal is judged to be a character signal by the identification information, the receiver main controller divides the character signal into two paths and respectively transmits the two paths of the character signal to the voice synthesis module and the dot matrix driving circuit, wherein the voice synthesis module converts the character signal into analog sound and transmits the analog sound to the loudspeaker for voice broadcasting through audio power playing, and meanwhile, the other path of the character signal is transmitted to the dot matrix driving circuit and displayed through the LED dot matrix screen.
The transmitting filter of the signal transmitting circuit comprises a capacitor C3, the preamplifier comprises an amplifier U3, the LED drive circuit comprises a resistor R3, a capacitor C3, an amplifier U3, a capacitor C3 and an inductor L3, wherein one end of the capacitor C3 is connected with a transmitter main controller, the other end of the capacitor C3 is connected with a pin 3 of the amplifier U3, a pin 3 of the amplifier U3 is connected with a pin + VCC 3 through the resistor R3, a pin 3 of the amplifier U3 is grounded through the resistor R3, a pin 2 of the amplifier U3 is connected with a pin 1 of the amplifier U3, a pin 4 of the amplifier U3 is grounded, a pin 8 of the amplifier U3 is connected with the pin + VCC 3, a pin 8 of the amplifier U3 is grounded through the capacitor C3, a pin 1 of the amplifier U3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the pin 3 and the other end of the capacitor U3 is connected with the pin 3 of the amplifier U3 and the capacitor U3. The pin 5 of the amplifier U2 is grounded through a capacitor C5, the pin 6 of the amplifier U2 is connected with the pin 7 of the amplifier U2, the pin 7 of the amplifier U2 is connected with the anode of the light-emitting diode LED through a capacitor C4, the cathode of the light-emitting diode LED is grounded, and the anode of the light-emitting diode LED is connected with the anode of the direct-current power supply through an inductor L1.
A pre-filter in a signal receiving circuit comprises a resistor R6, a capacitor C6 and an amplifier U6, a small signal amplifier comprises the resistor R6, the capacitor C6, the amplifier U6, an inverter U6 and the inverter U6, the photosensitive element adopts a photodiode, a 2 pin of the photodiode PD amplifier U6 is connected, a 3 pin of the amplifier U6 is connected with a reference voltage Vref through the resistor R6, an 8 pin of the amplifier U6 is connected with + VCC 6, an 8 pin of the amplifier U6 is grounded through the capacitor C6, a 4 pin of the amplifier U6 is grounded, a 1 pin of the amplifier U6 is connected with a 3 pin of the amplifier U6 through the capacitor C6, a 1 pin of the amplifier U6 is connected with the anode of the diode D6, a cathode of the diode D6 is connected with a 5 pin of the amplifier U6, a 5 pin of the amplifier U6 is grounded through the capacitor C6, a cathode of the amplifier U6 is connected with an RP 7 of the amplifier U6 and a rheostat 6 is connected with a rheostat 6 through a resistor R6. The 4 pin of the amplifier U4 is grounded, the 8 pin of the amplifier U4 is connected with + VCC2, the 1 pin of the amplifier U4 is connected with + VCC2 through a resistor R7, the 3 pin of the amplifier U4 is grounded through a resistor R5, the 1 pin of the amplifier U4 is connected with the 1 pin of an inverter U7, the 2 pin of the inverter U7 is connected with the 3 pin of the inverter U6, and the 4 pin of the inverter U6 is connected with a receiver main controller.
It can be seen from the above description that the signal distribution system of the present invention can transmit information such as voice, text, etc., and can be connected with an upper computer, a microphone or other sound sources, thus increasing the applicable scenes of the system, also giving consideration to information transmission and illumination, and avoiding unnecessary energy waste, so the present invention has substantial characteristics and significant progress.
Drawings
In order to more clearly illustrate the technical solution in the present embodiment, a brief description will be given below of the drawings required for use in the embodiments. It should be apparent that the drawings in the following description are of one embodiment of the invention and that other drawings may be derived from those drawings by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a transmitter.
Fig. 3 is a schematic diagram of a receiver.
Fig. 4 is a circuit diagram of a signal transmitting circuit.
Fig. 5 is a circuit diagram of a signal receiving circuit.
Detailed Description
For clarity of description, the present solution is further described below with reference to the accompanying drawings.
It can be seen from the attached drawings that the signal distribution system based on visible light communication comprises a transmitter and a plurality of receivers used for receiving visible light transmitted by the transmitter, the specific embodiment is not limited to one upper computer and the transmitter, in an application scene needing large-range deployment of visible light communication, a plurality of transmitters can be deployed, the receivers can receive signals of any transmitter without manual adjustment, a plurality of transmitters are controlled by an upper computer, the receivers are used for receiving the signals, the application scene of visible light communication is enlarged, the practical requirements of large area and complex site structure are met, and practical illumination is provided.
The transmitter comprises a transmitter main controller and a signal transmitting circuit, wherein the transmitter main controller is used for selecting, coding and modulating input information, the transmitter main controller is connected with the signal transmitting circuit, the signal transmitting circuit comprises a transmitting filter used for limiting the bandwidth of an analog signal, a preamplifier used for amplifying the filtered signal, an LED driving circuit used for improving the signal power and realizing optical modulation, and an LED lamp used for transmitting visible light, the LED lamp is connected with the LED driving circuit, the LED driving circuit is connected with the transmitting filter through the preamplifier, the transmitting filter is connected with the transmitter main controller, and the transmitter main controller is connected with a plurality of signal input ports; the signal input interface includes the audio input interface that is used for connecting microphone or external sound source and is used for connecting host computer USB interface, audio input interface and USB interface have transmitter owner controller to connect respectively, transmitter owner controller with be used for selecting the information source or input the keyboard connection of the information that will transmit, transmitter owner controller still with be used for showing the signal source or the display screen connection of conveying information.
The transmitting filter of the signal transmitting circuit comprises a capacitor C3, the preamplifier comprises an amplifier U3, the LED drive circuit comprises a resistor R3, a capacitor C3, an amplifier U3, a capacitor C3 and an inductor L3, wherein one end of the capacitor C3 is connected with a transmitter main controller, the other end of the capacitor C3 is connected with a pin 3 of the amplifier U3, a pin 3 of the amplifier U3 is connected with a pin + VCC 3 through the resistor R3, a pin 3 of the amplifier U3 is grounded through the resistor R3, a pin 2 of the amplifier U3 is connected with a pin 1 of the amplifier U3, a pin 4 of the amplifier U3 is grounded, a pin 8 of the amplifier U3 is connected with the pin + VCC 3, a pin 8 of the amplifier U3 is grounded through the capacitor C3, a pin 1 of the amplifier U3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the pin 3 and the other end of the capacitor U3 is connected with the pin 3 of the amplifier U3 and the capacitor U3. The pin 5 of the amplifier U2 is grounded through a capacitor C5, the pin 6 of the amplifier U2 is connected with the pin 7 of the amplifier U2, the pin 7 of the amplifier U2 is connected with the anode of the light-emitting diode LED through a capacitor C4, the cathode of the light-emitting diode LED is grounded, and the anode of the light-emitting diode LED is connected with the anode of the direct-current power supply through an inductor L1.
The receiver comprises a signal receiving circuit and a receiver main controller which is used for demodulating, sampling and extracting the original signal of the transmitter from the digital signal, and the signal receiving circuit is connected with the receiver main controller; the signal receiving circuit comprises a photosensitive element used for capturing information-carrying visible light, a pre-filter used for filtering out signal out-band noise and improving signal to noise ratio of signals, and a small signal amplifier used for amplifying power of the filtered signals, wherein the photosensitive element is connected with the pre-filter, the pre-filter is connected with a receiver main controller through the small signal amplifier, and the receiver main controller is connected with a signal output module. The signal output module is including being used for converting digital speech signal into the digital analog converter of analog audio frequency, a speech synthesis module for converting the characters into analog sound, a dot matrix drive circuit for converting the characters into the LED lamp dot matrix, an audio power amplifier module for driving the speaker to play sound, receiver main controller respectively with digital analog converter, the speech synthesis module, dot matrix drive electric power is connected, digital analog converter, the speech synthesis module is connected with audio power amplifier module respectively, audio power amplifier module is connected with the speaker, dot matrix drive circuit is connected with LED dot matrix screen.
A pre-filter in a signal receiving circuit comprises a resistor R6, a capacitor C6 and an amplifier U6, a small signal amplifier comprises a resistor R6, a capacitor C6, an amplifier U6, an inverter U6 and an inverter U6, a pin 2 of a photodiode PD amplifier U6 is connected, a pin 3 of the amplifier U6 is connected with a reference voltage Vref through the resistor R6, a pin 8 of the amplifier U6 is connected with + VCC 6, a pin 8 of the amplifier U6 is connected with the ground through the capacitor C6, a pin 4 of the amplifier U6 is connected with the ground, a pin 1 of the amplifier U6 is connected with a pin 3 of the amplifier U6 through the capacitor C6, a pin 1 of the amplifier U6 is connected with the anode of a diode D6 through the capacitor C6, the cathode of the diode D6 is connected with a pin 5 of the amplifier U6, a pin 5 of the amplifier U6 is connected with the ground through the capacitor C6, a pin 6 of the amplifier U6 is connected with the resistor RP 7 of the amplifier U6, and the amplifier U6 is connected with, in the present embodiment, the + VCC1 is +12V, and the + VCC2 is +5V, in which the 4 pin of the amplifier U4 is grounded, the 8 pin of the amplifier U4 is connected to + VCC2, the 1 pin of the amplifier U4 is connected to + VCC2 through a resistor R7, the 3 pin of the amplifier U4 is grounded through a resistor R5, the 1 pin of the amplifier U4 is connected to the 1 pin of the inverter U7, the 2 pin of the inverter U7 is connected to the 3 pin of the inverter U6, and the 4 pin of the inverter U6 is connected to the receiver main controller.
When the microphone works, the USB is connected with the upper computer, and the audio input interface is used for connecting a microphone or an external sound source; selecting information sources through a keyboard or manually inputting information to be transmitted, and obtaining corresponding feedback on a display screen; the method comprises the steps that information required to be distributed and transmitted from the outside is received through an audio input interface and a USB interface, the input information is coded and modulated through a transmitter main control controller and then is transmitted to a transmitting filter, the transmitting filter is used for limiting the bandwidth of a signal, a preamplifier is used for amplifying the signal with reduced amplitude caused by filtering, then the signal is transmitted to an LED driving circuit, the LED driving circuit converts an electric signal into an optical signal to realize optical modulation, and the optical signal is transmitted through an LED lamp; the transmitter main controller adopts a singlechip, and in the process, the capacitor C1 is an operational amplifier power supply filter capacitor; the RXD is connected with a serial port TXD of the singlechip and inputs a digital baseband signal from the singlechip; r1, R2 and U1A form an in-phase biaser, and direct current bias is added to a digital baseband signal input by RXD; r3, R4, C2, C5 and U1B form a low-pass filter, limit the bandwidth of the digital baseband signal, make its waveform smoother; the ILED is a direct current power supply of the LED, and the C4 and the L1 form a T-type biaser, which provides a direct current bias for the LED1 to keep the LED emitting light, and loads a processed baseband signal to the LED to realize optical modulation.
The receiver receives signals through the photodiode, then processes the signals, and the pre-filter is used for filtering out noise outside a signal band and improving the signal-to-noise ratio of the received signals; the small signal amplifier realizes power amplification of signals, then the signals are transmitted to a receiver main control controller, the receiver main controller adopts a single chip microcomputer, and the receiver main controller demodulates and samples electric signals recovered by the photodiode, the prefilter, the small signal amplifier, the analog-to-digital converter and the transmitter main control controller to extract original signals transmitted by the transmitter; the type of the original signal transmitted by the transmitter is judged through the identification information in the original signal, and the original signal is selectively transmitted to different secondary circuits according to the situation, and the specific implementation process is as follows: if the signal sent is judged to be a voice signal by the identification information, the receiver main controller sends the digital voice signal to a digital-to-analog converter, and the digital-to-analog converter converts the digital voice signal into analog audio and plays the analog audio; if the transmitted signal is judged to be a character signal by the identification information, the main control of the receiver sends one path of the character signal to the voice synthesis module, the character signal is converted into analog sound by the voice synthesis module and sent to the loudspeaker, and the other path of the character signal is sent to the dot matrix driving circuit after being coded and displayed on the LED dot matrix screen. In the process, after the photodiode PD obtains an optical signal, the optical signal is sent to a signal receiving circuit, and C6 in the signal receiving circuit is an operational amplifier power supply filter capacitor; the photodiode PD converts an optical signal into an electrical signal; r6, R8 and C9 form a trans-impedance amplifier, which amplifies the electric signal output by the photodiode PD and can inhibit high-frequency noise to a certain extent; r5 and C7 form a high-pass network, and the direct-current component output by the trans-impedance amplifier is isolated; u4 and R7 form a comparison circuit for recovering the original digital baseband signal; a peak holder consisting of C8, D1, RP1 and U5 provides a reference comparison voltage for U4; u7 and U6 are used to reshape the recovered digital baseband signal to make its waveform edges steeper; the TXD outputs the processed digital baseband signal, is connected with the RXD end of the singlechip and sends the digital baseband signal to the singlechip.
The above-described embodiments are merely one embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step on the basis of the above-described embodiments, fall within the scope of protection of the present invention.
Claims (6)
1. A signal distribution system based on visible light communication is characterized in that: comprising a transmitter and a plurality of receivers for receiving visible light emitted by the transmitter,
the transmitter comprises a transmitter main controller and a signal transmitting circuit, wherein the transmitter main controller is used for selecting, coding and modulating input information and is connected with the signal transmitting circuit,
the signal transmitting circuit comprises a transmitting filter for limiting the bandwidth of an analog signal, a preamplifier for amplifying the filtered signal, an LED driving circuit for improving the signal power and realizing light modulation, an LED lamp for transmitting visible light,
the LED lamp is connected with an LED drive circuit, the LED drive circuit is connected with a sending filter through a preamplifier, the sending filter is connected with a transmitter main controller, and the transmitter main controller is connected with a plurality of signal input ports;
the receiver comprises a signal receiving circuit and a receiver main controller which is used for demodulating, sampling and extracting the original signal of the transmitter from the digital signal, and the signal receiving circuit is connected with the receiver main controller;
the signal receiving circuit comprises a photosensitive element for capturing visible light carrying information, a pre-filter for filtering out signal out-band noise and improving signal-to-noise ratio of the signal, a small signal amplifier for amplifying power of the filtered signal,
the photosensitive element is connected with the pre-filter, the pre-filter is connected with the receiver main controller through the small signal amplifier, and the receiver main controller is connected with the signal output module.
2. The visible light communication-based signal distribution system of claim 1, wherein:
the signal input interface including the audio input interface that is used for connecting microphone or external sound source with be used for connecting host computer USB interface, audio input interface and USB interface have transmitter owner controller to connect respectively, transmitter owner controller with be used for selecting the information source or input the keyboard connection of the information that will transmit, transmitter owner controller still with be used for showing the signal source or the display screen connection of conveying information.
3. The visible light communication-based signal distribution system of claim 2, wherein:
the signal output module is including being used for converting digital speech signal into the digital analog converter of analog audio frequency, a speech synthesis module for converting the characters into analog sound, a dot matrix drive circuit for converting the characters into the LED lamp dot matrix, an audio power amplifier module for driving the speaker to play sound, receiver main controller respectively with digital analog converter, the speech synthesis module, dot matrix drive electric power is connected, digital analog converter, the speech synthesis module is connected with audio power amplifier module respectively, audio power amplifier module is connected with the speaker, dot matrix drive circuit is connected with LED dot matrix screen.
4. The visible light communication-based signal distribution system of claim 1, wherein:
the transmitting filter of the signal transmitting circuit comprises a capacitor C3, the preamplifier comprises an amplifier U3, the LED drive circuit comprises a resistor R3, a capacitor C3, an amplifier U3, a capacitor C3 and an inductor L3, wherein one end of the capacitor C3 is connected with a main controller of the transmitter, the other end of the capacitor C3 is connected with a pin 3 of the amplifier U3, a pin 3 of the amplifier U3 is connected with + VCC 3 through the resistor R3, a pin 3 of the amplifier U3 is grounded through the resistor R3, a pin 2 of the amplifier U3 is connected with a pin 1 of the amplifier U3, a pin 4 of the amplifier U3 is grounded, a pin 8 of the amplifier U3 is connected with + 3, a pin 8 of the amplifier U3 is connected with the ground through the capacitor C3, a pin 1 of the amplifier U3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the other end of the resistor R3 and the other end of the capacitor U3 is connected with a pin 367 of the amplifier U3. The pin 5 of the amplifier U2 is grounded through a capacitor C5, the pin 6 of the amplifier U2 is connected with the pin 7 of the amplifier U2, the pin 7 of the amplifier U2 is connected with the anode of the light-emitting diode LED through a capacitor C4, the cathode of the light-emitting diode LED is grounded, and the anode of the light-emitting diode LED is connected with the anode of the direct-current power supply through an inductor L1.
5. The visible light communication-based signal distribution system of claim 1, wherein:
the photosensitive element adopts a photodiode.
6. The visible light communication-based signal distribution system of claim 5, wherein:
a pre-filter in the signal receiving circuit comprises a resistor R6, a capacitor C6 and an amplifier U6, a small signal amplifier comprises a resistor R6, a capacitor C6, an amplifier U6, an inverter U6 and an inverter U6, a pin 2 of the photodiode PD amplifier U6 is connected, a pin 3 of the amplifier U6 is connected with a reference voltage Vref through the resistor R6, a pin 8 of the amplifier U6 is connected with + VCC 6, a pin 8 of the amplifier U6 is grounded through the capacitor C6, a pin 4 of the amplifier U6 is grounded, a pin 1 of the amplifier U6 is connected with a pin 3 of the amplifier U6 through the capacitor C6, a pin 1 of the amplifier U6 is connected with the anode of a diode D6 through the motor C6, the cathode of the diode D6 is connected with a pin 5 of the amplifier U6, a pin 5 of the amplifier U6 is grounded through the capacitor C6, a pin 6 of the amplifier U6 is connected with a pin RP 7 of the amplifier U6 and a rheostat 6 is connected with the pin 6 through the varistor U6, the 4 pin of the amplifier U4 is grounded, the 8 pin of the amplifier U4 is connected with + VCC2, the 1 pin of the amplifier U4 is connected with + VCC2 through a resistor R7, the 3 pin of the amplifier U4 is grounded through a resistor R5, the 1 pin of the amplifier U4 is connected with the 1 pin of an inverter U7, the 2 pin of the inverter U7 is connected with the 3 pin of the inverter U6, and the 4 pin of the inverter U6 is connected with a receiver main controller.
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