CN105743577A - Visible light audio transmission system based on phase-locked loop - Google Patents
Visible light audio transmission system based on phase-locked loop Download PDFInfo
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- H—ELECTRICITY
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- 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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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
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Abstract
The invention discloses a visible light audio transmission system based on a phase-locked loop. The existing visible light audio transmission system has high running cost and maintenance cost and poor anti-interference performance. A microphone receives the outside sound, the sound is input into an analog-to-digital conversion module to convert the analog quantity to the digital quantity, and then after a modulation module modulates the digital quantity, a modulated signal is loaded to LED (Light Emitting Diode) light to be transmitted through a transmitting circuit module; a silicon photocell receives a modulated light signal and converts the modulated light signal to an electric signal through a receiving circuit module, a demodulation module demodulates the electric signals and then inputs the electric signal to a waveform shaping module, the digital quantity of the transmitting part is restored, the signal is converted to an analog audio signal through a digital-to-analog conversion module, and lastly, the analog audio signal is amplified through a power amplifier and drives a loudspeaker; and the modulation module and the demodulation module both adopt CD4046 phase-locked loops. According to the system, frequency modulation and demodulation is carried out conveniently and easily by employing the CD4046 phase-locked loops, and signal transmission is performed by employing the LED light, so that the confidentiality is good.
Description
Technical field
The present invention relates to a kind of visible ray audio transmission system, particularly relate to a kind of visible ray audio transmission system utilizing phaselocked loop digital signal to be modulated and demodulates.
Background technology
LED is referred to as forth generation lighting source or green light source, and it has the plurality of advantages such as energy-saving and environmental protection, little, the life-span length of volume, has a wide range of applications.Continuous progressive along with LED technology, it is believed to be finally replaced existing luminaire, and due to it high speed can modularity, the visible light communication technology based on it have also been obtained good development.
The transmission means of audio frequency has a lot, and the audio-frequence player device such as existing audio amplifier or earphone is broadly divided into wired and wireless two big classes.Traditional wireline equipment also to connect special audio signal wire, very flexible and inconvenience except connecing power line.And as based on just using under the specific equipment of wireless device desires of WIFI, radio frequency or bluetooth or occasion, and confidentiality is bad, is subject to external interference, which greatly limits the extensive use of these wireless devices, causes them not to be promoted well.
In recent years the visible ray audio transmission system modulation and demodulation mode adopting complexity occurred so that operation and the maintenance cost of system are significantly high more.Although some system implementations are simple, but anti-interference is poor and unreliable.Study a kind of simple and reliable and stable audio transmission system particularly important.
Summary of the invention
It is an object of the invention to the deficiency existed for prior art, it is provided that a kind of visible ray audio transmission system utilizing phaselocked loop to carry out frequency modulation(PFM) and demodulation.
This invention address that the technical scheme that technical problem is taked is as follows:
The present invention includes the mike of emitting portion, analog-to-digital conversion module, modulation module and radiating circuit module, receives the receiving circuit module of part, demodulation module, waveform-shaping module and D/A converter module.Described emitting portion, by microphones external sound, is input to analog-to-digital conversion module and analog quantity is converted to digital quantity, then will launch in modulation signal loading to LED light by radiating circuit module after digital quantity being modulated by modulation module；Described reception part is received modulation optical signal by silicon cell, and by receiving circuit module, modulation optical signal is converted into the signal of telecommunication, demodulation module is input to waveform-shaping module after being demodulated by the signal of telecommunication again, restore the digital quantity of emitting portion, converted to simulated audio signal by D/A converter module again, amplify rear drive speaker operation finally by power amplifier；The core of described modulation module and demodulation module all adopts CD4046 phaselocked loop.
Described analog-to-digital conversion module adopts the first phonetic codec chip, and model is PT8A3121, and the pin OSCI of the first phonetic codec chip and one end of the first electric capacity C1 and the first crystal oscillator are connected, another one end terminating the second electric capacity C2 ground connection of the first electric capacity C1；The other end of the second electric capacity C2 and the first crystal oscillator all meets the pin OSCO of the first phonetic codec chip；The pin BIAS of the first phonetic codec chip connects one end of pin AIP, the 3rd electric capacity C3 and the four electric capacity C4, the equal ground connection of the other end of the 3rd electric capacity C3 and the four electric capacity C4；One end ground connection of mike, one end of the other end and the first resistance R1 and the 5th electric capacity C5 is connected, and another termination supply voltage of the first resistance R1, the other end of C5 connects with variable resistance R2 fixing end；The movable end of variable resistance R2 is directly connected with the simulation input pin AIN of the first phonetic codec chip with another fixing end, also constitutes feedback circuit through the pin AOUT of the parallel circuit of the 6th electric capacity C6 and the three resistance R3 and the first phonetic codec chip simultaneously；The pin GND ground connection of the first phonetic codec chip；Pin DVCC and the AVCC of the first phonetic codec chip all connects supply voltage, and the positive pole of the 7th electric capacity C7 and the eight polar capacitor C8 all meets AVCC, the other end of the 7th electric capacity C7 and the equal ground connection of negative pole of the 8th polar capacitor C8；Pin DIR and the FS of the first phonetic codec chip controls switch ground connection respectively through one.
The core of described modulation module is the frequency modulation(PFM) that make use of CD4046 phaselocked loop to realize digital signal.Digital quantity after analog-to-digital conversion module conversion is input to the inverting input of the first operational amplifier through the 6th resistance R6.The normal phase input end of the first operational amplifier connects one end of the 4th resistance R4 and the five resistance R5, another termination supply voltage VCC of the 4th resistance R4, the other end ground connection of the 5th resistance R5；The inverting input of one termination first operational amplifier of the 7th resistance R7, another outfan terminating the first operational amplifier and the control pin VCIN of voltage controlled oscillator in the first phaselocked loop；The signal input pin AIN to be compared of the first phaselocked loop connects supply voltage, the output pin VCOUT of comparison signal input pin BIN and voltage controlled oscillator is directly connected to, two oscillating capacitances are accessed pin CA and CB and are connected by the 9th electric capacity C9, and one end of pin R1 and the eight resistance R8 connects；The other end of the 8th resistance R8 and the equal ground connection of pin INH of the first phaselocked loop.The phase bit comparison pin PC1 of phaselocked loop connects after the tenth electric capacity C10 as FM signal outfan, output instantaneous frequency ω (t)=ω0+ Δ ω, wherein, ω0For the output pin VCOUT of the voltage controlled oscillator output frequency worked under the reference voltage of the first operational amplifier, the 9th electric capacity C9 and the eight resistance R8 determine；Δ ω is the frequency offset during signal voltage deviation reference voltage controlling pin input of voltage controlled oscillator.
The FM signal of described modulation module output inputs radiating circuit module through the 12nd polar capacitor C12, and delivers to the public input of manostat；One end of tenth resistance R10, one of variable resistance R9 fixing termination manostat public input；The other end of the tenth resistance R10, the positive pole of the 13rd polar capacitor C13 and the positive pole of light emitting diode D1 all connect the outfan of manostat；The negative pole of the movable end of variable resistance R9 and another fixing end, the negative pole of the 13rd polar capacitor C13, light emitting diode D1 connects and ground connection；The input of manostat and one end of the 11st electric capacity C11 connect and connect supply voltage；The other end ground connection of the 11st electric capacity C11；Output voltage after manostat modulation launches modulation optical signal by light emitting diode D1.
Described receiving circuit module utilizes silicon cell D2 receive modulation optical signal and be converted into the signal of telecommunication, is exported by the electrical signal of filtering and noise reduction device after the signal of telecommunication being processed by preamplifier and filtering and noise reduction device again.The negative pole of the anti-phase input termination silicon cell D2 of described preamplifier and one end of the 11st resistance R11；The other end of output termination the 11st resistance R11 of preamplifier and the inverting input of filtering and noise reduction device；The normal phase input end of described filtering and noise reduction device connects one end of the 12nd resistance R12 and the 13 resistance R13；Another termination supply voltage of 12nd resistance R12；The equal ground connection of the other end of the normal phase input end of preamplifier, the positive pole of silicon cell D2 and the 13rd resistance R13.
Described demodulation module receives, from the 14th electric capacity C14 one end, the signal of telecommunication that frequency is different, sends into the signal input pin AIN of the second phaselocked loop after the second operational amplifier amplifies.The normal phase input end of described second operational amplifier connects one end of the 14th resistance R14 and the 15 resistance R15, another termination supply voltage VCC of the 14th resistance R14, the other end ground connection of the 15th resistance R15；One end of anti-phase input termination the 16th resistance R16 and the 17 resistance R17 of described second operational amplifier, the other end of the 16th resistance R16 and the other end of the 14th electric capacity C14 connect；Another outfan terminating the second operational amplifier of 17th resistance R17 and the signal input pin AIN of the second phaselocked loop；The pin BIN of the second phaselocked loop meets pin VCOUT, pin CA and CB and connects the two ends of the 15th electric capacity C15, and pin R1 is ground connection after the 18th resistance R18 ground connection, pin PC2 series connection the 19th resistance R19 and the 16 electric capacity C16, and pin INH is directly grounded；Draw line between 19th resistance R19 and the 16th electric capacity C16 and meet the pin VCIN of the second phaselocked loop, and as demodulation signal output part.15th electric capacity C15 and the 18 resistance R18 is set, makes the mid frequency of voltage controlled oscillator in the second phaselocked loop equal to the mid frequency ω of voltage controlled oscillator in the first phaselocked loop of modulation module0.The signal of telecommunication inputs the signal input pin AIN of the second phaselocked loop, with the mid frequency ω of voltage controlled oscillator in the second phaselocked loop0Form inherent frequency error Δ ω ', the demodulation signal output part voltage of the second phaselocked loopIn the first phaselocked loop that wherein u (t) is modulation module, voltage controlled oscillator controls the pin voltage in t, 1/k0For demodulation factor.
Described waveform-shaping module includes the 3rd operational amplifier, Schmidt trigger and the first comparator Y；Described Schmidt trigger includes the second comparator X, the first limiter diode D3 and the second limiter diode D4.The demodulation signal output part of the anti-phase input termination demodulation module of the second comparator X, and the inverting input of the second comparator is through the 22nd resistance R22 ground connection；The normal phase input end of the second comparator and one end of the 20th resistance R20 and the 21st resistance R21 are connected, and another of the 20th resistance R20 terminates the outfan of the positive pole of the first limiter diode D3, the negative pole of the second limiter diode D4 and the 3rd operational amplifier；One end of output termination the 23rd resistance R23 and the 24 resistance R24 of the second comparator, another termination supply voltage of the 23rd resistance R23；Another of 24th resistance R24 terminates the inverting input of the negative pole of the first limiter diode D3, the other end of the 21st resistance R21, the positive pole of the second limiter diode D4 and the first comparator Y；The normal phase input end of the first comparator and the outfan of the 3rd operational amplifier are connected；The inverting input of the 3rd operational amplifier directly connects with its outfan；The outfan of the first comparator is set to reshaping signal outfan E and is connected with supply voltage through the 27th resistance R27；The normal phase input end of the 3rd operational amplifier connects one end of the 25th resistance R25 and the 26 resistance R26, another termination VCC of the 25th resistance R25, the other end ground connection of the 26th resistance R26；17th electric capacity C17 and the 26 resistance R26 is in parallel.
The core of described D/A converter module is the second phonetic codec chip, model PT8A3121.The pin DATA of reshaping signal output termination second phonetic codec chip of demodulation module；Pin OSCI and the 18 electric capacity C18 of the second phonetic codec chip and one end of the second crystal oscillator are connected, another one end terminating the 19th electric capacity C19 ground connection of the 18th electric capacity C18；The other end of the 19th electric capacity C19 and the second crystal oscillator all meets the pin OSCO of the second phonetic codec chip；Pin FS and the DIR of the second phonetic codec chip controls switch ground connection through one respectively；Pin DVCC and the AVCC of the second phonetic codec chip all connects supply voltage, the positive pole of one end of the 23rd electric capacity C23 and the 20th quadripolarity electric capacity C24 all meets AVCC, the other end of the 23rd electric capacity C23 and the equal ground connection of negative pole of the 20th quadripolarity electric capacity C24；The pin GND ground connection of the second phonetic codec chip.The pin BIP of the second phonetic codec chip meets the bias voltage bias of pin BIAS output；Digital-to-analogue conversion output pin DAOUT series connection the 20th electric capacity C20 and the 28 resistance R28, the 29th resistance R29 of the second phonetic codec chip are followed by the pin BIN of the second phonetic codec chip；One end of 21st electric capacity C21 is connected with the common port of the 28th resistance R28 and the 29th resistance R29, other end ground connection；The pin BIN and simulated audio signal output pin BOUT of the second phonetic codec chip connect through the 22nd electric capacity C22；The common port of one termination the 28th resistance R28 and the 29 resistance R29 of the 30th resistance R30, the pin BOUT of the other end and the second phonetic codec chip receives the positive pole of the 25th polar capacitor C25 together；One of variable resistance R31 is fixing, and end connects with the negative pole of the 25th polar capacitor C25, and another fixing end is connected with the inverting input of power amplifier and ground connection；The normal phase input end of the activity termination power amplifier of variable resistance R31；The outfan of power amplifier drives speaker through the 26th polar capacitor C26, simultaneously through the 27th electric capacity C27 and the 32 resistance R32 ground connection.When pin DIR becomes high level, the reshaping signal in pin DATA input will be converted to simulated audio signal and export from simulated audio signal output pin BOUT, and drives speaker operation by subsequent conditioning circuit.
The invention have the benefit that
The present invention utilizes CD4046 phaselocked loop to carry out the modulation and demodulation of frequency, convenient and easy；The simulated audio signal of input, through analog digital conversion, becomes digital signal, digital signal is carried out frequency modulation(PFM) and has good anti-interference, make system more reliable and more stable.Utilizing the transmission that LED light carries out signal not only can meet the needs of illumination, and can avoid the leakage of information, confidentiality is fine.When emitting portion input audio signal, the place that every light is irradiated to all can receive the audio frequency of input with reception device, so increases the motility of use.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention.
Fig. 2 is the analog-to-digital conversion module circuit diagram of the present invention.
Fig. 3-1 is the modulation module circuit diagram of the present invention.
Fig. 3-2 is the radiating circuit module circuit diagram of the present invention.
Fig. 4-1 is the receiving circuit module circuit diagram of the present invention.
Fig. 4-2 is the demodulation module circuit diagram of the present invention.
Fig. 5 is the waveform-shaping module circuit diagram of the present invention.
Fig. 6 is the D/A converter module circuit diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is elaborated.
With reference to Fig. 1, visible ray audio transmission system based on phaselocked loop, including the mike MIC of emitting portion, analog-to-digital conversion module 1, modulation module 2 and radiating circuit module 3, receive the receiving circuit module 4 of part, demodulation module 5, waveform-shaping module 6 and D/A converter module 7.Emitting portion is received external sound by mike MIC, is input to analog-to-digital conversion module 1 and analog quantity is converted to digital quantity, then will launch in modulation signal loading to LED light by radiating circuit module 3 after digital quantity being modulated by modulation module 2；Receive part and received modulation optical signal by silicon cell, and by receiving circuit module 4, modulation optical signal is converted into the signal of telecommunication, demodulation module 5 is input to waveform-shaping module 6 after being demodulated by the signal of telecommunication again, thus reducible go out emitting portion digital quantity, converted to simulated audio signal by D/A converter module 7 again, amplify rear drive speaker Y work finally by power amplifier PA.
Fig. 2 is the circuit diagram of analog-to-digital conversion module 1, and the pin OSCI of the first phonetic codec chip (model PT8A3121) and one end of the first electric capacity C1 and the first crystal oscillator are connected, another one end terminating the second electric capacity C2 ground connection of the first electric capacity C1；The other end of the second electric capacity C2 and the first crystal oscillator all meets the pin OSCO of the first phonetic codec chip；The pin BIAS of the first phonetic codec chip connects one end of pin AIP, the 3rd electric capacity C3 and the four electric capacity C4, the equal ground connection of the other end of the 3rd electric capacity C3 and the four electric capacity C4；One end ground connection of mike, one end of the other end and the first resistance R1 and the 5th electric capacity C5 is connected, and another termination supply voltage of the first resistance R1, the other end of C5 connects with variable resistance R2 fixing end；The movable end of variable resistance R2 is directly connected with the simulation input pin AIN of the first phonetic codec chip with another fixing end, also constitutes feedback circuit through the pin AOUT of the parallel circuit of the 6th electric capacity C6 and the three resistance R3 and the first phonetic codec chip simultaneously；The pin GND ground connection of the first phonetic codec chip；Pin DVCC and the AVCC of the first phonetic codec chip all connects supply voltage, and the positive pole of the 7th electric capacity C7 and the eight polar capacitor C8 all meets AVCC, the other end of the 7th electric capacity C7 and the equal ground connection of negative pole of the 8th polar capacitor C8；The pin DIR of the first phonetic codec chip is by controlling switch ground connection.When pin DIR is low level, the simulated audio signal that mike collects is converted to digital quantity and is exported by pin DATA (A end).Additionally, the first phonetic codec chip also provides for two kinds of sample frequencys (respectively 1/128 and the 1/64 of the crystal oscillator frequency of the first crystal oscillator), can completing to select by pin FS, pin FS is through controlling switch ground connection.
Fig. 3-1,3-2 sets forth modulation module and the radiating circuit module circuit diagram of emitting portion.As shown in figure 3-1, the core of modulation module is the frequency modulation(PFM) that make use of CD4046 phaselocked loop to realize digital signal.Digital quantity after analog-to-digital conversion module 1 conversion inputs from A end, receives the inverting input of the first operational amplifier (model LM324) through the 6th resistance R6.The normal phase input end of the first operational amplifier connects one end of the 4th resistance R4 and the five resistance R5, another termination supply voltage VCC of the 4th resistance R4, the other end ground connection of the 5th resistance R5；The inverting input of one termination first operational amplifier of the 7th resistance R7, another outfan terminating the first operational amplifier and the control pin VCIN of voltage controlled oscillator in the first phaselocked loop；The reference voltage of the first operational amplifier is regulated by the ratio of R4 and R5, and the amplification quantity of the first operational amplifier is determined by the ratio of R7 and R6.The effect of the first operational amplifier is the control pin voltage regulating voltage controlled oscillator, thus changing the output frequency of voltage controlled oscillator.The signal input pin AIN to be compared of the first phaselocked loop connects supply voltage, the output pin VCOUT of comparison signal input pin BIN and voltage controlled oscillator is directly connected to, two oscillating capacitances are accessed pin CA and CB and are connected by the 9th electric capacity C9, and one end of pin R1 and the eight resistance R8 connects；The other end of the 8th resistance R8 and the equal ground connection of pin INH of the first phaselocked loop, make voltage controlled oscillator normal operation.The phase bit comparison pin PC1 of phaselocked loop connects after the tenth electric capacity C10 as FM signal outfan B, output instantaneous frequency ω (t)=ω0+ Δ ω, wherein, ω0For the output pin VCOUT of the voltage controlled oscillator output frequency worked under the reference voltage of the first operational amplifier, C9 and R8 comprehensively determine；Δ ω is the frequency offset during signal voltage deviation reference voltage controlling pin input of voltage controlled oscillator.So, digital signal is just modulated to the FM signal of two kinds of frequencies (0 represents one, and 1 represents one).
As shown in figure 3-2, the FM signal of modulation module output inputs radiating circuit module through the 12nd polar capacitor C12, and deliver to the public input of manostat (model 7805), wherein the positive pole of the 12nd polar capacitor C12 connects the common port of manostat, negative pole input FM signal；One end of tenth resistance R10, one of variable resistance R9 fixing termination manostat public input；The other end of the tenth resistance R10, the positive pole of the 13rd polar capacitor C13 and the positive pole of light emitting diode D1 all connect the outfan of manostat；The negative pole of the movable end of variable resistance R9 and another fixing end, the negative pole of the 13rd polar capacitor C13, light emitting diode D1 connects and ground connection；The input of manostat and one end of the 11st electric capacity C11 connect and connect supply voltage；The other end ground connection of the 11st electric capacity C11；Output voltage after manostat modulation launches modulation optical signal by light emitting diode D1.
Fig. 4-1,4-2 sets forth receiving circuit module 4 and demodulation module 5 circuit diagram of reception part.As shown in Fig. 4-1, receiving circuit module utilizes silicon cell D2 receive modulation optical signal and be converted into the signal of telecommunication.In order to strengthen the range of receiving of silicon cell D2, Fresnel Lenses also can be installed on silicon cell.Owing to the signal of telecommunication of silicon cell D2 output is very faint, so that exported by the electrical signal C of filtering and noise reduction device again after the signal of telecommunication being processed by preamplifier (model OPA380) and filtering and noise reduction device (model OPA350).The negative pole of the anti-phase input termination silicon cell D2 of preamplifier and one end of the 11st resistance R11；The other end of output termination the 11st resistance R11 of preamplifier and the inverting input of filtering and noise reduction device；The normal phase input end of filtering and noise reduction device connects one end of the 12nd resistance R12 and the 13 resistance R13；Another termination supply voltage of 12nd resistance R12；The equal ground connection of the other end of the normal phase input end of preamplifier, the positive pole of silicon cell D2 and the 13rd resistance R13.
As shown in the Fig. 4-2, the core of demodulation module 5 is also CD4046 phaselocked loop, and its demodulation principle is that the signal of telecommunication all the time receiving circuit module transmitted with phaselocked loop carries out frequency lock or tracking.Receive, from the 14th electric capacity C14 one end (C end), the signal of telecommunication that frequency is different, after the second operational amplifier (model LM324) amplifies, send into the signal input pin AIN of the second phaselocked loop.The normal phase input end of the second operational amplifier connects one end of the 14th resistance R14 and the 15 resistance R15, another termination supply voltage VCC of the 14th resistance R14, the other end ground connection of the 15th resistance R15；One end of anti-phase input termination the 16th resistance R16 and the 17 resistance R17 of the second operational amplifier, the other end of the 16th resistance R16 and the other end of the 14th electric capacity C14 connect；Another outfan terminating the second operational amplifier of 17th resistance R17 and the signal input pin AIN of the second phaselocked loop；The pin BIN of the second phaselocked loop meets pin VCOUT, pin CA and CB and connects the two ends of the 15th electric capacity C15, and pin R1 is ground connection after the 18th resistance R18 ground connection, pin PC2 series connection the 19th resistance R19 and the 16 electric capacity C16, and pin INH is directly grounded；Draw line between 19th resistance R19 and the 16th electric capacity C16 and meet the pin VCIN of the second phaselocked loop, and as demodulation signal output part D.C15 and R18 is set, makes the mid frequency of voltage controlled oscillator in the second phaselocked loop equal to the mid frequency ω of voltage controlled oscillator in the first phaselocked loop of modulation module0.The signal of telecommunication inputs the signal input pin AIN of the second phaselocked loop, with the mid frequency ω of voltage controlled oscillator in the second phaselocked loop0Form inherent frequency error Δ ω ', and for desirable phaselocked loop, have demodulation signal output part voltageIn the first phaselocked loop that wherein u (t) is modulation module, voltage controlled oscillator controls the pin voltage in t, 1/k0For demodulation factor.
Referring to Fig. 5, although the waveform after demodulation module 5 demodulation is substantially identical with the digital signal before modulation, but has concussion at high and low level place, so also signal should be carried out waveform shaping.Waveform-shaping module 6 includes the 3rd operational amplifier (model LM324), Schmidt trigger and the first comparator Y (model LM393)；Schmidt trigger includes the second comparator X (model LM393), the first limiter diode D3 and the second limiter diode D4.The effect of the 3rd operational amplifier is to be regulated by the ratio of the 20th resistance R20 and the 21 resistance R21 to provide a reference voltage to Schmidt trigger and the first comparator, and the reference voltage of this reference voltage and the first operational amplifier is equal.The demodulation signal output part of the anti-phase input termination demodulation module 5 of the second comparator X, and the inverting input of the second comparator is through the 22nd resistance R22 ground connection；The normal phase input end of the second comparator and one end of the 20th resistance R20 and the 21st resistance R21 are connected, and another of the 20th resistance R20 terminates the outfan of the positive pole of the first limiter diode D3, the negative pole of the second limiter diode D4 and the 3rd operational amplifier；One end of output termination the 23rd resistance R23 and the 24 resistance R24 of the second comparator, another termination supply voltage of the 23rd resistance R23；Another of 24th resistance R24 terminates the inverting input of the negative pole of the first limiter diode D3, the other end of the 21st resistance R21, the positive pole of the second limiter diode D4 and the first comparator Y；The normal phase input end of the first comparator and the outfan of the 3rd operational amplifier are connected；The inverting input of the 3rd operational amplifier directly connects with its outfan；The outfan of the first comparator is set to reshaping signal outfan E and is connected with supply voltage through the 27th resistance R27；The normal phase input end of the 3rd operational amplifier connects one end of the 25th resistance R25 and the 26 resistance R26, the other end ground connection of another termination VCC, the R26 of R25；17th electric capacity C17 and the 26 resistance R26 is in parallel；When the inverting input of the second comparator X is high level, the outfan of the second comparator is low level, and D3 turns on, and D4 ends, the outfan of the first comparator is high level, and the conversion of level just can occur when only the anti-phase input terminal voltage of the second comparator X is less than low threshold voltage；When the inverting input of the second comparator X is low level, the outfan of the second comparator is high level, and D4 turns on, and D3 ends, first comparator be output as low level, just can there is the conversion of level when only the anti-phase input terminal voltage of the second comparator X is more than high threshold voltage.By the conducting of two limiter diodes and cut-off, it is possible to achieve the mutual conversion of high and low threshold voltage, tolerance is the difference between the two.Thus achieve the square wave shaping of demodulation signal.
Fig. 6 is the circuit diagram of D/A converter module 7.The pin DATA of reshaping signal output termination the second phonetic codec chip (model PT8A3121) of demodulation module 5；Pin OSCI and the 18 electric capacity C18 of the second phonetic codec chip and one end of the second crystal oscillator are connected, another one end terminating the 19th electric capacity C19 ground connection of the 18th electric capacity C18；The other end of the 19th electric capacity C19 and the second crystal oscillator all meets the pin OSCO of the second phonetic codec chip；Pin FS and the DIR of the second phonetic codec chip controls switch ground connection through one respectively；Pin DVCC and the AVCC of the second phonetic codec chip all connects supply voltage, the positive pole of one end of the 23rd electric capacity C23 and the 20th quadripolarity electric capacity C24 all meets AVCC, the other end of the 23rd electric capacity C23 and the equal ground connection of negative pole of the 20th quadripolarity electric capacity C24；The pin GND ground connection of the second phonetic codec chip.The pin BIP of the second phonetic codec chip meets the bias voltage bias of pin BIAS output；Digital-to-analogue conversion output pin DAOUT series connection the 20th electric capacity C20 and the 28 resistance R28, the 29th resistance R29 of the second phonetic codec chip are followed by the pin BIN of the second phonetic codec chip；One end of 21st electric capacity C21 is connected with the common port of R28 and R29, other end ground connection；The pin BIN and simulated audio signal output pin BOUT of the second phonetic codec chip connect through the 22nd electric capacity C22；The common port of one termination R28 and the R29 of the 30th resistance R30, the pin BOUT of the other end and the second phonetic codec chip receives the positive pole of the 25th polar capacitor C25 together；One of variable resistance R31 is fixing, and end connects with the negative pole of C25, and another fixing end is connected with the inverting input of power amplifier (model LM386) and ground connection；The normal phase input end of the activity termination power amplifier of variable resistance R31；The outfan of power amplifier drives speaker through the 26th polar capacitor C26, simultaneously through the 27th electric capacity C27 and the 32 resistance R32 ground connection.When pin DIR becomes high level, the reshaping signal in pin DATA input will be converted to simulated audio signal and export from simulated audio signal output pin BOUT, and drives speaker operation by subsequent conditioning circuit.
Claims (8)
1. based on the visible ray audio transmission system of phaselocked loop, including the mike of emitting portion, analog-to-digital conversion module, modulation module and radiating circuit module, receive the receiving circuit module of part, demodulation module, waveform-shaping module and D/A converter module, it is characterized in that: described emitting portion is by microphones external sound, it is input to analog-to-digital conversion module and analog quantity is converted to digital quantity, then will modulation signal loading to LED light be launched by radiating circuit module after digital quantity being modulated by modulation module；Described reception part is received modulation optical signal by silicon cell, and by receiving circuit module, modulation optical signal is converted into the signal of telecommunication, demodulation module is input to waveform-shaping module after being demodulated by the signal of telecommunication again, restore the digital quantity of emitting portion, converted to simulated audio signal by D/A converter module again, amplify rear drive speaker operation finally by power amplifier；The core of described modulation module and demodulation module all adopts CD4046 phaselocked loop.
2. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterized in that: described analog-to-digital conversion module adopts the first phonetic codec chip, model is PT8A3121, the pin OSCI of the first phonetic codec chip and one end of the first electric capacity C1 and the first crystal oscillator are connected, another one end terminating the second electric capacity C2 ground connection of the first electric capacity C1；The other end of the second electric capacity C2 and the first crystal oscillator all meets the pin OSCO of the first phonetic codec chip；The pin BIAS of the first phonetic codec chip connects one end of pin AIP, the 3rd electric capacity C3 and the four electric capacity C4, the equal ground connection of the other end of the 3rd electric capacity C3 and the four electric capacity C4；One end ground connection of mike, one end of the other end and the first resistance R1 and the 5th electric capacity C5 is connected, and another termination supply voltage of the first resistance R1, the other end of C5 connects with variable resistance R2 fixing end；The movable end of variable resistance R2 is directly connected with the simulation input pin AIN of the first phonetic codec chip with another fixing end, also constitutes feedback circuit through the pin AOUT of the parallel circuit of the 6th electric capacity C6 and the three resistance R3 and the first phonetic codec chip simultaneously；The pin GND ground connection of the first phonetic codec chip；Pin DVCC and the AVCC of the first phonetic codec chip all connects supply voltage, and the positive pole of the 7th electric capacity C7 and the eight polar capacitor C8 all meets AVCC, the other end of the 7th electric capacity C7 and the equal ground connection of negative pole of the 8th polar capacitor C8；Pin DIR and the FS of the first phonetic codec chip controls switch ground connection respectively through one.
3. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterised in that: the core of described modulation module is the frequency modulation(PFM) that make use of CD4046 phaselocked loop to realize digital signal；Digital quantity after analog-to-digital conversion module conversion is input to the inverting input of the first operational amplifier through the 6th resistance R6；The normal phase input end of the first operational amplifier connects one end of the 4th resistance R4 and the five resistance R5, another termination supply voltage VCC of the 4th resistance R4, the other end ground connection of the 5th resistance R5；The inverting input of one termination first operational amplifier of the 7th resistance R7, another outfan terminating the first operational amplifier and the control pin VCIN of voltage controlled oscillator in the first phaselocked loop；The signal input pin AIN to be compared of the first phaselocked loop connects supply voltage, the output pin VCOUT of comparison signal input pin BIN and voltage controlled oscillator is directly connected to, two oscillating capacitances are accessed pin CA and CB and are connected by the 9th electric capacity C9, and one end of pin R1 and the eight resistance R8 connects；The other end of the 8th resistance R8 and the equal ground connection of pin INH of the first phaselocked loop；The phase bit comparison pin PC1 of phaselocked loop connects after the tenth electric capacity C10 as FM signal outfan, output instantaneous frequency ω (t)=ω0+ Δ ω, wherein, ω0For the output pin VCOUT of the voltage controlled oscillator output frequency worked under the reference voltage of the first operational amplifier, the 9th electric capacity C9 and the eight resistance R8 determine；Δ ω is the frequency offset during signal voltage deviation reference voltage controlling pin input of voltage controlled oscillator.
4. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterised in that: the FM signal of described modulation module output inputs radiating circuit module through the 12nd polar capacitor C12, and delivers to the public input of manostat；One end of tenth resistance R10, one of variable resistance R9 fixing termination manostat public input；The other end of the tenth resistance R10, the positive pole of the 13rd polar capacitor C13 and the positive pole of light emitting diode D1 all connect the outfan of manostat；The negative pole of the movable end of variable resistance R9 and another fixing end, the negative pole of the 13rd polar capacitor C13, light emitting diode D1 connects and ground connection；The input of manostat and one end of the 11st electric capacity C11 connect and connect supply voltage；The other end ground connection of the 11st electric capacity C11；Output voltage after manostat modulation launches modulation optical signal by light emitting diode D1.
5. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterized in that: described receiving circuit module utilizes silicon cell D2 receive modulation optical signal and be converted into the signal of telecommunication, is exported by the electrical signal of filtering and noise reduction device after the signal of telecommunication being processed by preamplifier and filtering and noise reduction device again；The negative pole of the anti-phase input termination silicon cell D2 of described preamplifier and one end of the 11st resistance R11；The other end of output termination the 11st resistance R11 of preamplifier and the inverting input of filtering and noise reduction device；The normal phase input end of described filtering and noise reduction device connects one end of the 12nd resistance R12 and the 13 resistance R13；Another termination supply voltage of 12nd resistance R12；The equal ground connection of the other end of the normal phase input end of preamplifier, the positive pole of silicon cell D2 and the 13rd resistance R13.
6. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterized in that: described demodulation module receives, from the 14th electric capacity C14 one end, the signal of telecommunication that frequency is different, after the second operational amplifier amplifies, send into the signal input pin AIN of the second phaselocked loop；The normal phase input end of described second operational amplifier connects one end of the 14th resistance R14 and the 15 resistance R15, another termination supply voltage VCC of the 14th resistance R14, the other end ground connection of the 15th resistance R15；One end of anti-phase input termination the 16th resistance R16 and the 17 resistance R17 of described second operational amplifier, the other end of the 16th resistance R16 and the other end of the 14th electric capacity C14 connect；Another outfan terminating the second operational amplifier of 17th resistance R17 and the signal input pin AIN of the second phaselocked loop；The pin BIN of the second phaselocked loop meets pin VCOUT, pin CA and CB and connects the two ends of the 15th electric capacity C15, and pin R1 is ground connection after the 18th resistance R18 ground connection, pin PC2 series connection the 19th resistance R19 and the 16 electric capacity C16, and pin INH is directly grounded；Draw line between 19th resistance R19 and the 16th electric capacity C16 and meet the pin VCIN of the second phaselocked loop, and as demodulation signal output part；15th electric capacity C15 and the 18 resistance R18 is set, makes the mid frequency of voltage controlled oscillator in the second phaselocked loop equal to the mid frequency ω of voltage controlled oscillator in the first phaselocked loop of modulation module0；The signal of telecommunication inputs the signal input pin AIN of the second phaselocked loop, with the mid frequency ω of voltage controlled oscillator in the second phaselocked loop0Form inherent frequency error Δ ω ', the demodulation signal output part voltage of the second phaselocked loopIn the first phaselocked loop that wherein u (t) is modulation module, voltage controlled oscillator controls the pin voltage in t, 1/k0For demodulation factor.
7. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterised in that: described waveform-shaping module includes the 3rd operational amplifier, Schmidt trigger and the first comparator Y；Described Schmidt trigger includes the second comparator X, the first limiter diode D3 and the second limiter diode D4；The demodulation signal output part of the anti-phase input termination demodulation module of the second comparator X, and the inverting input of the second comparator is through the 22nd resistance R22 ground connection；The normal phase input end of the second comparator and one end of the 20th resistance R20 and the 21st resistance R21 are connected, and another of the 20th resistance R20 terminates the outfan of the positive pole of the first limiter diode D3, the negative pole of the second limiter diode D4 and the 3rd operational amplifier；One end of output termination the 23rd resistance R23 and the 24 resistance R24 of the second comparator, another termination supply voltage of the 23rd resistance R23；Another of 24th resistance R24 terminates the inverting input of the negative pole of the first limiter diode D3, the other end of the 21st resistance R21, the positive pole of the second limiter diode D4 and the first comparator Y；The normal phase input end of the first comparator and the outfan of the 3rd operational amplifier are connected；The inverting input of the 3rd operational amplifier directly connects with its outfan；The outfan of the first comparator is set to reshaping signal outfan E and is connected with supply voltage through the 27th resistance R27；The normal phase input end of the 3rd operational amplifier connects one end of the 25th resistance R25 and the 26 resistance R26, another termination VCC of the 25th resistance R25, the other end ground connection of the 26th resistance R26；17th electric capacity C17 and the 26 resistance R26 is in parallel.
8. the visible ray audio transmission system based on phaselocked loop according to claim 1, it is characterised in that: the core of described D/A converter module is the second phonetic codec chip, model PT8A3121；The pin DATA of reshaping signal output termination second phonetic codec chip of demodulation module；Pin OSCI and the 18 electric capacity C18 of the second phonetic codec chip and one end of the second crystal oscillator are connected, another one end terminating the 19th electric capacity C19 ground connection of the 18th electric capacity C18；The other end of the 19th electric capacity C19 and the second crystal oscillator all meets the pin OSCO of the second phonetic codec chip；Pin FS and the DIR of the second phonetic codec chip controls switch ground connection through one respectively；Pin DVCC and the AVCC of the second phonetic codec chip all connects supply voltage, the positive pole of one end of the 23rd electric capacity C23 and the 20th quadripolarity electric capacity C24 all meets AVCC, the other end of the 23rd electric capacity C23 and the equal ground connection of negative pole of the 20th quadripolarity electric capacity C24；The pin GND ground connection of the second phonetic codec chip；The pin BIP of the second phonetic codec chip meets the bias voltage bias of pin BIAS output；Digital-to-analogue conversion output pin DAOUT series connection the 20th electric capacity C20 and the 28 resistance R28, the 29th resistance R29 of the second phonetic codec chip are followed by the pin BIN of the second phonetic codec chip；One end of 21st electric capacity C21 is connected with the common port of the 28th resistance R28 and the 29th resistance R29, other end ground connection；The pin BIN and simulated audio signal output pin BOUT of the second phonetic codec chip connect through the 22nd electric capacity C22；The common port of one termination the 28th resistance R28 and the 29 resistance R29 of the 30th resistance R30, the pin BOUT of the other end and the second phonetic codec chip receives the positive pole of the 25th polar capacitor C25 together；One of variable resistance R31 is fixing, and end connects with the negative pole of the 25th polar capacitor C25, and another fixing end is connected with the inverting input of power amplifier and ground connection；The normal phase input end of the activity termination power amplifier of variable resistance R31；The outfan of power amplifier drives speaker through the 26th polar capacitor C26, simultaneously through the 27th electric capacity C27 and the 32 resistance R32 ground connection；When pin DIR becomes high level, the reshaping signal in pin DATA input will be converted to simulated audio signal and export from simulated audio signal output pin BOUT, and drives speaker operation by subsequent conditioning circuit.
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Application publication date: 20160706 |
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