CN104320188A - Stereo wireless transmission system - Google Patents
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- CN104320188A CN104320188A CN201410497635.7A CN201410497635A CN104320188A CN 104320188 A CN104320188 A CN 104320188A CN 201410497635 A CN201410497635 A CN 201410497635A CN 104320188 A CN104320188 A CN 104320188A
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Abstract
The invention discloses a stereo wireless transmission system. The system comprises a sending end, and a receiving end, wherein the sending end comprises an audio signal source, a visible light emitting device, and two front-end processing circuits connected between the audio signal source and the visible light emitting device in parallel, the two front-end processing circuits are used for controlling the visible light emitting device to emit a visible light signal in a free space according to an audio signal; the receiving end comprises a visible light receiving device, an audio output device, and two rear-end processing circuits connected between the visible light receiving device and the audio output device in parallel, the visible light receiving device senses and receives the visible light signal, the two rear-end processing circuits are used for recovering an audio signal, and the recovered audio signal is output through the audio output device. The function that a light signal can be used by the visible light to realize the communication is sufficiently used, the frequency modulation is respectively performed on a left channel and a right channel at the sending end, the recovery and the demodulation are performed at the receiving end, and the transmission of the stereo is finished while illuminating; the visible light can be still used for the transmission of the stereo on an operating place at which an electromagnetic wave is restricted.
Description
Technical field
The present invention relates to technical field of photo communication, particularly a kind of stereo sound wireless transmission system.
Background technology
Sound is a kind of important channel that people obtain external information, and in today that rhythm of life is more and more faster, increasing people loosens by music.The sound sent due to nature is all stereo, stereosonic music can bring sensation on the spot in person to people more, HiFi (High-Fidelity, high-fidelity) is stereo not only has stereosonic stereovision, can also realize high-fidelity simultaneously.
HiFi sound equipment is stereo for playing, and in playback procedure, amplifies without distortion and process audio signal indices, to go back the style of acoustic source, high fidelity (Hi-Fi), is mainly used in appreciating high-quality music.In appreciation process, need a complete system to realize, comprise hardware (the namely primary structure of audio amplifier: loudspeaker), software (audio signal source) and acoustic surrounding, wherein audio signal source derives from the electromagnetic signals such as DVD, VCD, CD, transmitted with electromagnetic form by medium between audio signal source and audio amplifier, and play eventually through audio amplifier or earphone.Usually need by wire medium between audio signal source and audio amplifier, or realize audio transmission with communication.
Need to use the signal transmssion line with audio interface by the mode of wire medium transmission of audio signal in prior art, i.e. tone frequency channel wire, such as, tone frequency channel wire between earphone cord or computer (or other audio signal source output equipment) and audio amplifier, if equipment is also connected with the tone frequency channel wire of other function simultaneously, holding wire can be caused too much, and easily obscure, it is convenient not to use; If transmitted by communication between audio signal source and audio amplifier, because radio communication needs to take fixing frequency spectrum, electromagnetic wave is utilized to realize the transmission of audio signal.Particularly for stereo, generally have L channel and R channel two sound channels at least, if adopt above-mentioned wire medium transmission of audio signal, multiple tone frequency channel wire is needed to be connected with multiple audio amplifier by audio signal source, radio communication then needs to pass through electromagnetic communication between multiple audio signal reception end and audio signal transmitting terminal, electromagnetic radiation is comparatively concentrated, uses restricted place normally to use for aircraft cabin, high ferro or hospital etc. to electromagnetic wave.
Summary of the invention
In order to solve the wireless transmission that cannot realize audio signal in prior art when breaking away from electromagnetic wave restriction, the invention provides a kind of stereo sound wireless transmission system, comprising:
Transmitting terminal, comprise audio signal source and visible light-emitting devices, and two front-end processing circuit be connected to side by side between described audio signal source and described visible light-emitting devices, control described visible light-emitting devices according to described audio signal and send visible light signal at free space;
Receiving terminal, comprise visible light receiver part and audio output device, and two the back-end processing circuit be connected to side by side between described visible light receiver part and described audio output device, described visible light receiver part senses and receives described visible light signal, recover audio signal by described two back-end processing circuit, and exported by described audio output device.
Optionally, described two front-end processing circuit are L channel front-end processing circuit and described R channel front-end processing circuit, comprise all successively:
First low noise amplifier, automatic gain control circuit, preemphasis circuit, frequency modulation circuit and transmission output buffer;
Wherein said frequency modulation circuit utilizes voltage controlled oscillator to produce carrier wave, and described L channel front-end processing circuit is different with the carrier frequency used in described R channel front-end processing circuit medium frequency modulation circuit.
Optionally, described L channel front-end processing circuit is all connected with described visible light-emitting devices with the transmission output buffer of described R channel front-end processing circuit;
Described visible light-emitting devices comprises LED drive circuit and LED array, described LED drive circuit provides DC offset voltage, and the audio signal source exported by described transmission output buffer and described DC offset voltage carry out being coupled to LED array, and the luminescence of described LED array is driven to produce the light pulse of light and shade change.
Optionally, described LED array adopts identical LED with annular distribution, and all LED are all towards different directions.
Optionally, between the L channel front-end processing circuit of described transmitting terminal and described R channel front-end processing circuit, also comprise voice operated transmission module, control when not having audio signal to export for sensing to close LED array.
Optionally, described visible light receiver part is visible light detector array, is made up of multiple photodetector, and adopts the annular distribution identical with described LED array, for receiving the visible light signal from all directions, and light signal is converted into the signal of telecommunication.
Optionally, described two back-end processing circuit are L channel back-end processing circuit and described R channel back-end processing circuit, comprise all successively:
Second amplifying circuit, amplitude limiter circuit, frequency demodulation circuit, deaccentuator and reception output buffer;
Described frequency demodulation circuit adopts the carrier wave of quadrature demodulator to carry out demodulation, and adopts the carrier frequency used in described L channel front-end processing circuit and described R channel front-end processing circuit medium frequency modulation circuit respectively in described L channel back-end processing circuit and described R channel back-end processing circuit medium frequency demodulator circuit.
Optionally, band pass filter and the second low noise amplifier is also comprised successively between described visible light receiver part and two second amplifying circuits.
Optionally, L channel back-end processing circuit and the described R channel back-end processing circuit of described receiving terminal also comprise: squelch circuit, control to close described reception transmission buffer when not having audio signal to export for sensing.
Optionally, also comprise between described audio signal source and described front-end processing circuit: front audio socket, the audio signal that described audio signal source sends is divided into left channel audio signal and right channel audio signal after described front audio socket, enters L channel front-end processing circuit respectively and R channel front-end processing circuit processes;
Also comprise between described back-end processing circuit and audio output device: rear end audio socket, recover the left channel audio signal that obtains and right channel audio signal is connected to described audio output device by described rear end audio socket through described back-end processing circuit.
Stereo sound wireless transmission system provided by the invention makes full use of visible ray and light signal can be utilized to realize the function of communication, at transmitting terminal, respectively frequency modulation(FM) is carried out to left and right acoustic channels, carry out recovering and demodulation at receiving terminal, stereosonic transmission is completed, even if visible ray still can be utilized to carry out stereosonic propagation in the restricted field of employment of electromagnetic wave while illumination.
Accompanying drawing explanation
The composition schematic diagram of a kind of stereo sound wireless transmission system that Fig. 1 provides for embodiment;
Fig. 2 is the structural representation of transmitting terminal functional module in embodiment;
Fig. 3 is the structural representation of receiving terminal functional module in embodiment.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Visible light communication (Visible Light Communications, VLC) the high speed light and shade flash signal be invisible to the naked eye that technology utilizes fluorescent lamp or light-emitting diode (Light Emitting Diode is called for short LED) etc. to send exactly carrys out transmission information.Visible light communication possesses following feature: to eye-safe, no electromagnetic pollution, illumination, communication can be had concurrently and control location, the maximum difference of visible light communication and other communication technology is also had to be that visible light communication does not take frequency spectrum, namely frequency spectrum can use without the need to authorizing, and is therefore applicable to security fields.As can be seen here, visible light communication can be widely used in the place having particular/special requirement, as cabin, and high ferro and hospital etc.
LED has been deep into multiple fields of daily life as lighting technology of new generation, compared with traditional fluorescent lamp or incandescent lamp, LED response sensitivity is high, low in energy consumption, also has the feature of higher modulation bandwidth and long service life, therefore can using the light source of LED as high-speed communication.Because modulating frequency is very high, human eye discovers the flicker less than light, therefore utilize LED as while light source, the high speed light and shade flicker information that LED can also be utilized to carry carrys out transmission information, and namely illumination is coupled with the degree of depth of communication and realizes LED-based visible light communication.
Provide a kind of stereo sound wireless transmission system in embodiments of the invention, structural representation as shown in Figure 1, comprising:
Transmitting terminal 100, comprise audio signal source 110 and visible light-emitting devices 120, and two front-end processing circuit 130 be connected to side by side between audio signal source 110 and visible light-emitting devices, control visible light-emitting devices 120 according to audio signal and send visible light signal at free space.
Receiving terminal 200, comprise visible light receiver part 210 and audio output device 220, and two the back-end processing circuit 230 be connected to side by side between visible light receiver part 210 and audio output device 220, visible light receiver part 210 senses and receives visible light signal, recover audio signal by two back-end processing circuit 230, and exported by audio output device 220.
L channel in this system reversal body sound audio signals and R channel are modulated, by visible light communication technology, the information in audio signal is sent in free space by visible ray afterwards, the visible ray that receiving terminal receives from free space is divided into L channel and R channel to carry out demodulation process equally, and plays.Without electromagnetic interference in transmitting procedure, realize green communications, even if therefore use restricted Code in Hazardous Special Locations also can realize the wireless transmission of stereo audio signal based on visible light communication technology at electromagnetic wave, simultaneously because visible light communication does not take frequency spectrum, not easily cracked by other people, only could the audio-frequency information that visible ray carries be received and demodulated in the scope that can detect visible ray, confidentiality and fail safe higher.
Stereo audio signal refers to the voice signal etc. of the audio signal of broadcast, the music of storage, recording or microphone input, and these audio signals are play through MP3, PC and accessed by earphone cord or directly access in the front-end processing circuit 130 of transmitting terminal 100 by audio signal source 110.
Optionally, in the present embodiment, the functional module structure schematic diagram of transmitting terminal is as shown in Figure 2, and wherein two front-end processing circuit 130 are respectively L channel front-end processing circuit 130a and R channel front-end processing circuit 130b, comprise all successively:
First low noise amplifier 131, automatic gain control circuit 132, preemphasis circuit 133, frequency modulation circuit 134 and transmission output buffer 135, wherein the first low noise amplifier 131 and automatic gain control circuit 132 are for amplifying left channel audio signal or right channel audio signal, and preemphasis circuit 133, frequency modulation circuit 134 and transmission output buffer 135 are for modulating the signal of telecommunication that will be converted into light signal.
First low noise amplifier 131 is for carrying out low noise amplification to the audio signal (left channel audio signal or right channel audio signal) of input, and automatic gain control circuit 132 adjusts with signal strength signal intensity for making the Gain Automatic of the first low noise amplifier 131 of front end, can limit the distortion of ovennodulation and high-amplitude signal.
Pre-emphasis module 133 carries out lifting for the high fdrequency component in the audio signal (left channel audio signal or right channel audio signal) to input and amplifies; Frequency modulation circuit (i.e. FM modulation circuit) 134 is for carrying out frequency modulation(FM) by the signal after amplification, left and right acoustic channels utilizes the carrier wave that frequency is f1 and f2 to modulate respectively, to realize stereosonic propagation, the signal after modulation directly supplies the visible light-emitting devices 120 of rear end through sending output buffer 135.
Also it should be noted that, frequency modulation circuit 134 utilizes voltage controlled oscillator (not shown) to produce carrier wave, and L channel front-end processing circuit is different with the carrier frequency used in R channel front-end processing circuit medium frequency modulation circuit, i.e. f1 ≠ f2.
Optionally, the transmission output buffer 135 of L channel front-end processing circuit 130a is all connected with visible light-emitting devices 120 with the transmission output buffer 135 ' of R channel front-end processing circuit 130b.Visible light-emitting devices 120 comprises LED drive circuit 121 and LED array 122, LED drive circuit 121 provides DC offset voltage, and the audio signal source exported by transmission output buffer 135 and DC offset voltage carry out being coupled to LED array 122, and driving LED array 122 luminescence produces the light pulse of light and shade change.LED drive circuit 121 for mating through amplifying the signal of telecommunication after modulation with LED light source characteristic, and then can produce the light signal of undistorted light and shade flicker change.
Multiple identical, that diameter the is 2.5mm straw hat LED of LED array 122 is formed, and with annular distribution, and all LED are all towards different directions, all directions are made all to have light uniform emission, can promote the range of search coverage like this, light signal is finally received by visible light receiver part 210 after free space transmission.
Optionally, between the L channel front-end processing circuit 130a of transmitting terminal 100 and R channel front-end processing circuit 130b, also comprise voice operated transmission module 136, control when not having audio signal to export for sensing to close LED array.Such as introduce in process at museum exhibits, memorial museum picture, general audio frequency is loop play, can choice for use voice operated transmission module 136 extinguish at the back light of a broadcasting end, light again on lamp when again playing, both can inform that this introduction of spectators terminated, energy-conservation object can have been realized again.
Optionally, in the present embodiment, the functional module structure schematic diagram of receiving terminal is as shown in Figure 3, and wherein two back-end processing circuit 230 are L channel back-end processing circuit 230a and R channel back-end processing circuit 230b, comprise all successively:
Second amplifying circuit 231, amplitude limiter circuit 232, frequency demodulation circuit 233, deaccentuator 234 and reception output buffer 235, wherein second amplifying circuit 231 and amplitude limiter circuit 232 are for amplifying the signal of telecommunication, and frequency demodulation circuit 233, deaccentuator 234 and reception output buffer 235 are for carrying out demodulation to the signal after amplification.
Visible light receiver part 210 is made up of multiple photodetector, and with annular distribution, namely photodetector array is 210, and the light signal received from all angles, towards all directions, is conveniently converted to current signal and transmits to rear class by the angle of photodetector.
Optionally, band pass filter (BPF) 236 and the second low noise amplifier 237 is also comprised between visible light receiver part 210 and two second amplifying circuits 231, wherein band pass filter 236 is for non-signal frequency content filtering too low and too high in the current signal that will detect, second low noise amplifier 237 has the effect identical with above-mentioned first low noise amplifier 131, namely carries out low noise amplification; Amplitude limiter circuit 232 is for providing the signal of stable amplitude for demodulator.
Frequency demodulation circuit (i.e. FM demodulation circuit) 233 adopts the carrier wave of quadrature demodulator (not shown) to carry out demodulation, for by original signal from demodulation carrier wave out, and identical with corresponding modulated carrier frequencies for the carrier frequency of demodulation, therefore adopt the carrier frequency used in L channel front-end processing circuit 130a and R channel front-end processing circuit 130b medium frequency modulation circuit respectively in L channel back-end processing circuit 230a and R channel back-end processing circuit 230b.Deaccentuator 234, for forcing down decay to the high fdrequency component demodulating signal, recovers original signal power distribution, then flows to audio output device 220 by receiving output buffer 235.
Optionally, L channel back-end processing circuit 230a and the R channel back-end processing circuit 230b of receiving terminal 200 also comprise: squelch circuit 238, control when not having audio signal to export for sensing to close to receive transmission buffer, avoid background noise, namely avoid the noise occurring thorn thorn in output device 220.
Optionally, also comprise between audio signal source 110 and front-end processing circuit 130: front audio socket 140, the audio signal that audio signal source 110 sends is divided into left channel audio signal and right channel audio signal after front audio socket 140, enters L channel front-end processing circuit 130a and R channel front-end processing circuit 130b process respectively.
In like manner, also comprise between back-end processing circuit 230 and audio output device 220: rear end audio socket 240, recover the left channel audio signal that obtains and right channel audio signal is connected to audio output device 220 by rear end audio socket 240 through back-end processing circuit 230.
Based on above-mentioned Fig. 2, the specific works process of transmitting terminal 100 is as follows:
First, an audio frequency (music) is opened at PC or MP3, audio signal is out input to the front audio socket 140 of transmitting terminal 100 by earphone (generally using 3.5mm earphone now) line from PC or MP3 earpiece holes, is divided into L channel and R channel to export respectively enters into symmetrical front-end processing circuit 130 through the audio signal of front audio socket 140.
Secondly, L channel and right-channel signals are respectively through after low noise amplifier 131 and automatic gain control circuit 132, and signal is exaggerated and can also prevents that amplitude is too high causes wave distortion, for signal madulation is ready simultaneously.
Then, the signal after amplification enters into respective preemphasis circuit 133 respectively, and the amplitude of signal high fdrequency component is exaggerated.Voltage controlled oscillator (Voltage Controlled Oscillator, be called for short VCO) produce carrier wave, left and right sound channels signal is the FM modulation circuit 134 of f1 and f2 respectively through carrier frequency, and it is the first step transmitting stereo audio that left and right sound channels signal is modulated respectively.
Then, the signal after modulation is merged into a road through front end output buffer 135 two-way and enters LED drive circuit 131.Audio stream signal after processing of circuit is coupled with LED direct current biasing by LED drive circuit 131, utilizes the modulation principle driving LED light source luminescent that audio signal is strong to LED light, realizes illumination and the double effects communicated.
Voice operated transmission control module wherein can comparing audio signal amplitude and background noise amplitude, can extinguish LED for energy-conservation in time not having audio transmission, determines the need of this module work in practical application according to scene.Such as, museum exhibits, the introduction of memorial museum picture are all generally loop play, and can this module of choice for use extinguish at the back light of a broadcasting end, wait lamp when again playing light again, the major function of this module is exactly energy-conservation in fact thereupon.
Based on above-mentioned Fig. 3, receiving terminal 200 specific works process is as follows:
First, photodetector array receives from the next visible ray audio signal of free space transmission and is converted into current signal.
Secondly, band pass filter 236 can the low frequency of filtering non-signal place frequency band and high-frequency noise, filtered signal enters low noise amplifier, low noise amplifier noise factor is very low, effectively signal to noise ratio can be improved when amplifying faint detection light signal, signal through low noise amplifier is divided into two from delivery outlet, enters follow-up processing module respectively.
Then, two paths of signals enters second amplifying circuit 231 and amplitude limiter circuit 232 respectively, the second amplifying circuit 231 pairs of low noises amplify after signal again amplify, amplitude limiter circuit 232 can provide the signal of stable amplitude for demodulator, can suppress the existence of parasitic AM demodulation in FM demodulation.
Then, signal after amplifying process enters FM demodulation circuit 233, and FM demodulation circuit 233 adopts quadrature demodulator, and two-way carrier frequency is adjusted to f1 and f2 respectively, realize the demodulation to left and right sound channels signal, left and right sound channels signal respectively demodulation is the second step of transmission stereo audio.
Finally, the signal after demodulation, through deaccentuator 234, forces down attenuation processing to the high fdrequency component of signal, to realize the power distribution of original signal; The earphone that demodulation two paths of signals is out connected with tone frequency channel wire by rear end audio socket 240 through rear end output buffer 235 or audio amplifier are listened to.
In sum, the beneficial effect that the stereo sound wireless transmission system that the present embodiment provides possesses is as follows:
(1) the stereo audio transmission system based on visible light communication technology utilizes high speed visible LED to achieve the wireless transmission of stereo audio signal, and communication distance can reach 2m, and without electromagnetic interference, has the speciality of green communications.
(2) the breakpoint transmission function of audio signal is achieved based on the stereo audio transmission system of visible light communication technology.After wireless video signal is blocked by barrier, receiving terminal video stops playing.After barrier is removed, audio signal can normally receive and play again.
(3) the stereo audio transmission system based on visible light communication technology have employed the method that left and right acoustic channels carries out FM modulation respectively, achieves stereosonic propagation; And bandwidth ratio is higher, the transmission of stereo audio can be realized; Transmitting terminal and receiving terminal circuit have employed integrated chip, are convenient to integrated, and whole system is small and exquisite portable;
(4) all conveniently can buy based on all chips of stereo audio transmission system of visible light communication technology and element, low price, conveniently to make, the exhibition rooms such as museum can be applied to and carry out showpiece introduction, have very high practical value.
In sum, system provided by the invention makes full use of visible ray and light signal can be utilized to realize the function of communication, at transmitting terminal, respectively frequency modulation(FM) is carried out to left and right acoustic channels, carry out recovering and demodulation at receiving terminal, stereosonic transmission is completed, even if visible ray still can be utilized to carry out stereosonic propagation in the restricted field of employment of electromagnetic wave while illumination.This system is applicable to the wireless transmission of HiFi (High-Fidelity, high-fidelity) stereo audio, and proposes theory and experimental basis to indoor visible light communication system, has a good application prospect.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a stereo sound wireless transmission system, is characterized in that, comprising:
Transmitting terminal, comprise audio signal source and visible light-emitting devices, and two front-end processing circuit be connected to side by side between described audio signal source and described visible light-emitting devices, control described visible light-emitting devices according to described audio signal and send visible light signal at free space;
Receiving terminal, comprise visible light receiver part and audio output device, and two the back-end processing circuit be connected to side by side between described visible light receiver part and described audio output device, described visible light receiver part senses and receives described visible light signal, recover audio signal by described two back-end processing circuit, and exported by described audio output device.
2. system according to claim 1, is characterized in that, described two front-end processing circuit are L channel front-end processing circuit and described R channel front-end processing circuit, comprise all successively:
First low noise amplifier, automatic gain control circuit, preemphasis circuit, frequency modulation circuit and transmission output buffer;
Wherein said frequency modulation circuit utilizes voltage controlled oscillator to produce carrier wave, and described L channel front-end processing circuit is different with the carrier frequency used in described R channel front-end processing circuit medium frequency modulation circuit.
3. system according to claim 2, is characterized in that, described L channel front-end processing circuit is all connected with described visible light-emitting devices with the transmission output buffer of described R channel front-end processing circuit;
Described visible light-emitting devices comprises LED drive circuit and LED array, described LED drive circuit provides DC offset voltage, and the audio signal source exported by described transmission output buffer and described DC offset voltage carry out being coupled to LED array, and the luminescence of described LED array is driven to produce the light pulse of light and shade change.
4. system according to claim 3, is characterized in that, described LED array adopts identical LED with annular distribution, and all LED are all towards different directions.
5. the system according to claim 3 or 4, it is characterized in that, also comprise voice operated transmission module between the L channel front-end processing circuit of described transmitting terminal and described R channel front-end processing circuit, control when not having audio signal to export for sensing to close LED array.
6. system according to claim 4, it is characterized in that, described visible light receiver part is visible light detector array, be made up of multiple photodetector, and adopt the annular distribution identical with described LED array, for receiving the visible light signal from all directions, and light signal is converted into the signal of telecommunication.
7. system according to claim 2, is characterized in that, described two back-end processing circuit are L channel back-end processing circuit and described R channel back-end processing circuit, comprise all successively:
Second amplifying circuit, amplitude limiter circuit, frequency demodulation circuit, deaccentuator and reception output buffer;
Described frequency demodulation circuit adopts the carrier wave of quadrature demodulator to carry out demodulation, and adopts the carrier frequency used in described L channel front-end processing circuit and described R channel front-end processing circuit medium frequency modulation circuit respectively in described L channel back-end processing circuit and described R channel back-end processing circuit.
8. system according to claim 7, is characterized in that, also comprises band pass filter and the second low noise amplifier successively between described visible light receiver part and two second amplifying circuits.
9. system according to claim 7, it is characterized in that, L channel back-end processing circuit and the described R channel back-end processing circuit of described receiving terminal also comprise: squelch circuit, control to close described reception transmission buffer when not having audio signal to export for sensing.
10. the system according to any one of claim 1-9, it is characterized in that, also comprise between described audio signal source and described front-end processing circuit: front audio socket, the audio signal that described audio signal source sends is divided into left channel audio signal and right channel audio signal after described front audio socket, enters L channel front-end processing circuit respectively and R channel front-end processing circuit processes;
Also comprise between described back-end processing circuit and audio output device: rear end audio socket, recover the left channel audio signal that obtains and right channel audio signal is connected to described audio output device by described rear end audio socket through described back-end processing circuit.
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| CN106572420A (en) * | 2016-10-26 | 2017-04-19 | 东南大学 | Stereo optical wireless earphone |
| CN110070790A (en) * | 2019-04-11 | 2019-07-30 | 广州大学 | Multi-modal communications demo system based on software radio |
| WO2021185117A1 (en) * | 2020-03-16 | 2021-09-23 | 维沃移动通信有限公司 | Audio transmission method and electronic device |
| CN113490187A (en) * | 2020-03-16 | 2021-10-08 | 维沃移动通信有限公司 | Audio transmission method and electronic equipment |
| CN112019273A (en) * | 2020-08-31 | 2020-12-01 | 尉氏县职业技术教育中心 | Two-way wireless audio transmission system based on white light LED |
| CN114422030A (en) * | 2022-03-29 | 2022-04-29 | 天津七一二移动通信有限公司 | Half-duplex audio transmission device based on LIFI technology and implementation method |
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Application publication date: 20150128 |