CN112614499A - Deep ultraviolet communication audio transmission device and control method thereof - Google Patents
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Abstract
The invention relates to a deep ultraviolet communication audio transmission device and a control method thereof. The deep ultraviolet communication audio transmission device comprises a transmitting module, a receiving module and a control module; the transmitting module comprises an audio source, an audio coding unit, a constant current driving unit, an acceleration switch circuit, a transistor driving unit and a deep ultraviolet LED array, and the control module is used for modulating a coding signal output by the audio coding unit; the acceleration switch circuit loads the modulation signal into a power supply driving signal output by the constant current driving unit; the receiving module comprises a photoelectric detector, an operational amplifier filter circuit, an analog-to-digital conversion unit, an audio decoding unit and a playing source, wherein the operational amplifier filter circuit is used for amplifying an electric signal output by the photoelectric detector; the control module is used for demodulating the regular digital waveform signal output by the analog-to-digital conversion unit. The invention can effectively improve the transmission quality of the audio signal and simultaneously expand the application field of the deep ultraviolet communication technology.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a deep ultraviolet light communication audio transmission device and a control method thereof.
Background
The ultraviolet light communication is a light communication technology based on the scattering and absorption of atmospheric molecules and sub-sol particles. The existence of the solar blind area provides a good communication background for the ultraviolet communication device working in the wave band. Because ultraviolet light communication is a wireless optical communication technology based on atmospheric scattering and absorption, the scattering action of ultraviolet light in the atmosphere changes the energy transmission direction of the ultraviolet light, but the attenuation caused by the absorption action limits the transmission of the ultraviolet light within a certain distance. Secondly, in optical communication, due to various noises and other unpredictable factors in the external environment, information errors are easily caused in the process of optical transmission. One type of errors are sudden errors caused by optical interference of different wave bands in an external environment, namely error bits continuously appear, which easily influences the stability and communication quality of a communication link; another type of error is direct distance obstruction or reflection interference caused by physical factors such as sand particles and the like, and the error rate of optical communication transmission can be improved to a certain extent, so that the application field of the optical communication technology is limited.
Therefore, how to improve the problems of poor audio transmission quality and low security in the optical communication process to improve the optical transmission efficiency of the audio signal is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a deep ultraviolet communication audio transmission device and a control method thereof, which are used for solving the problems of poor audio signal transmission quality and low confidentiality in the prior art.
In order to solve the above problems, the present invention provides a deep ultraviolet light communication audio transmission device, which includes a transmitting module, a receiving module and a control module; wherein:
the transmitting module comprises an audio source, an audio coding unit, a constant current driving unit, an acceleration switch circuit, a transistor driving unit and a deep ultraviolet LED array, wherein the audio source is used for receiving an audio signal to be transmitted; the audio coding unit is used for coding the audio signal to be sent to form a coded signal and then transmitting the coded signal to the control module; the control module is used for modulating the coded signal to form a modulation signal and outputting the modulation signal to the acceleration switch circuit; the constant current driving unit is used for providing a power supply driving signal for the deep ultraviolet LED array, the output end of the constant current driving unit is connected with the acceleration switch circuit, and the acceleration switch circuit loads the modulation signal to the power supply driving signal; the input end of the transistor driving unit is connected with the acceleration switch circuit, and the output end of the transistor driving unit is connected with the deep ultraviolet LED array and is used for driving the deep ultraviolet LED array to emit a first deep ultraviolet modulation optical signal;
The receiving module comprises a photoelectric detector, an operational amplifier filter circuit, an analog-to-digital conversion unit, an audio decoding unit and a playing source, wherein the photoelectric detector is used for receiving a second deep ultraviolet modulation optical signal from the outside and converting the second deep ultraviolet modulation optical signal into an electric signal; the operational amplifier filter circuit is used for amplifying the electric signal through two-stage negative feedback; the analog-to-digital conversion unit is used for judging the amplified electric signal and outputting a regular digital waveform signal; the control module is used for demodulating the regular digital waveform signal to form a demodulation signal; the audio decoding unit is used for decoding the demodulated signal to obtain an audio signal to be received; the playing source is used for playing the audio signal to be received.
Optionally, the control module further includes:
the data synchronization unit is used for carrying out asynchronous data synchronization processing on the coding signals;
and the DDS generator is used for converting the coded signal processed by the data synchronization unit into a modulation signal and outputting the modulation signal to the acceleration switch circuit.
Optionally, the data synchronization unit is further configured to perform asynchronous data synchronization processing on the regular digital waveform signal; the control module further comprises:
The noncoherent demodulator is used for noncoherently demodulating the regular digital waveform signal processed by the data synchronization unit to form a demodulation signal;
and the phase-locked loop is used for carrying out bit synchronization processing on the demodulation signal and outputting the demodulation signal to the audio decoding unit.
Optionally, the control module further includes:
and the key unit comprises a plurality of keys and is used for adjusting the working state of the deep ultraviolet communication audio transmission device, and the working state comprises one or more than two of a closing state, a signal transmitting state, a signal receiving state and a signal transmitting and receiving duplex state.
Optionally, the control module further includes:
and the OLED driving unit is used for controlling an OLED display screen to display the related information of the deep ultraviolet light communication audio transmission device.
Optionally, the transmitting module further includes:
and the heat dissipation unit is arranged at the periphery of the deep ultraviolet LED array and is used for carrying out heat dissipation treatment on the deep ultraviolet LED array.
Optionally, the receiving module further includes:
and the filter is arranged at the receiving end of the photoelectric detector and used for filtering background light mixed in the second deep ultraviolet modulation optical signal.
In order to solve the above problem, the present invention further provides a control method of the audio transmission device for deep ultraviolet light communication, including the following steps:
receiving an audio signal to be transmitted;
coding the audio signal to be sent to form a coded signal;
modulating the coded signal to form a modulated signal;
after the modulation signal is loaded to a power supply driving signal of a deep ultraviolet LED array, driving the deep ultraviolet LED array to emit a first deep ultraviolet modulation light signal;
receiving a second deep ultraviolet modulation optical signal and converting the second deep ultraviolet modulation optical signal into an electric signal;
amplifying the electric signal through two-stage negative feedback;
judging the amplified electric signal to form a regular digital waveform signal;
demodulating the regular digital waveform signal to form a demodulated signal;
and decoding the demodulated signal and then playing.
Optionally, the specific step of modulating the encoded signal includes:
carrying out asynchronous data synchronization processing on the coded signal;
and converting the coded signal subjected to asynchronous data synchronization processing into a modulation signal by a DDS generator.
Optionally, the specific step of demodulating the regular digital waveform signal includes:
carrying out asynchronous data synchronization processing on the regular digital waveform signal;
carrying out incoherent demodulation on the regular digital waveform signals subjected to asynchronous data synchronization processing to form demodulation signals;
and carrying out bit synchronization processing on the demodulation signal.
According to the deep ultraviolet light communication audio transmission device and the control method thereof, the deep ultraviolet light is used as a carrier for audio signal transmission, high-confidentiality data transmission is achieved, the anti-interference capability of the deep ultraviolet light is high, and therefore the transmission quality of audio signals can be effectively improved. Meanwhile, the deep ultraviolet communication audio transmission device can be used for non-line-of-sight communication and has the characteristics of high signal-to-noise ratio, no need of tracking and aiming and the like, thereby being beneficial to expanding the application field of the deep ultraviolet communication technology.
Drawings
Fig. 1 is a schematic structural diagram of an audio transmission device for deep ultraviolet light communication in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control module for digital modulation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control module performing digital demodulation in accordance with an embodiment of the present invention;
Fig. 4 is a schematic flow chart of a method for controlling an audio transmission device for deep ultraviolet light communication to transmit an audio signal according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for controlling an audio transmission device for deep ultraviolet light communication to receive an audio signal according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of the deep ultraviolet light communication audio transmission device and the control method thereof according to the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a deep ultraviolet light communication audio transmission device in the embodiment of the present invention. As shown in fig. 1, the audio transmission device for deep ultraviolet light communication provided in this embodiment includes a transmitting module, a receiving module, and a control module 12; wherein:
the transmitting module comprises an audio source 10, an audio encoding unit 11, a constant current driving unit 13, an acceleration switch circuit 14, a transistor driving unit 15 and a deep ultraviolet LED array 16, wherein the audio source 10 is used for receiving an audio signal to be transmitted; the audio encoding unit 11 is configured to encode the audio signal to be sent, form an encoded signal, and transmit the encoded signal to the control module 12; the control module 12 is configured to modulate the encoded signal to form a modulated signal, and output the modulated signal to the acceleration switch circuit 14; the constant current driving unit 13 is configured to provide a power driving signal to the deep ultraviolet LED array 16, an output end of the constant current driving unit 13 is connected to the acceleration switch circuit 14, and the acceleration switch circuit 14 loads the modulation signal to the power driving signal; the input end of the transistor driving unit 15 is connected to the acceleration switch circuit 14, and the output end of the transistor driving unit is connected to the deep ultraviolet LED array 16, and is configured to drive the deep ultraviolet LED array 16 to emit a first deep ultraviolet modulated light signal;
The receiving module comprises a photoelectric detector 19, an operational amplifier filter circuit 20, an analog-to-digital conversion unit 21, an audio decoding unit 22 and a playing source 23, wherein the photoelectric detector 19 is used for receiving a second deep ultraviolet modulation optical signal from the outside and converting the second deep ultraviolet modulation optical signal into an electric signal; the operational amplifier filter circuit 20 is configured to amplify the electrical signal through two-stage negative feedback; the analog-to-digital conversion unit 21 is configured to perform decision processing on the amplified electrical signal and output a regular digital waveform signal; the control module 12 is configured to demodulate the regular digital waveform signal to form a demodulated signal; the audio decoding unit 22 is configured to decode the demodulated signal to obtain an audio signal to be received; the playing source 23 is used for playing the audio signal to be received.
Specifically, when the audio transmission device for deep ultraviolet light communication transmits an audio signal to be transmitted to the outside: first, the audio source 10 receives the audio signal to be transmitted from the outside, and transmits the audio signal to be transmitted to the audio encoding unit 11. Wherein, the audio source 10 may receive the audio signal to be transmitted through a coaxial input audio interface or a microphone. Next, the audio encoding unit 11 performs encoding processing on the audio signal to be transmitted to form an encoded signal. The audio encoding unit 11 may be of the model WM 8731. The encoded signal output by the audio encoding unit 11 of model WM8731 is a single-bit data signal. Then, the control module 12 modulates the single-bit encoding signal to form a modulation signal and sends the modulation signal to the acceleration switch circuit 14. Meanwhile, the constant current driving unit 13 outputs a power driving signal to the acceleration switching circuit 14. The acceleration switch circuit 14 loads the modulation signal into the power driving signal after receiving the modulation signal, and transmits the power driving signal loaded with the modulation signal to the transistor driving unit 15. The transistor driving unit 15 drives the deep ultraviolet LED array 16 to emit a first deep ultraviolet modulated light signal according to the received power driving signal loaded with the modulation signal. The first deep ultraviolet modulated light signal is a bright and dark light signal carrying the audio signal to be transmitted.
The constant current driving unit 13 may be a four-way constant current driving unit, for example, a four-way constant current driving unit including an EMI filter. The Transistor driving unit 15 may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
When the deep ultraviolet communication audio transmission device receives an audio signal to be received: first, the second deep ultraviolet modulated light signal carrying the audio signal to be received is received by the photodetector 19, and the second deep ultraviolet modulated light signal is subjected to photoelectric conversion to generate an electrical signal. The photodetector 19 may be an avalanche diode photodetector. Then, the operational amplifier filter circuit 20 amplifies the weak electrical signal to a suitable amplitude through two-stage negative feedback (the specific amplitude can be adjusted according to actual needs by those skilled in the art), and the analog-to-digital conversion unit 21 performs decision processing on the amplified electrical signal to output a regular digital waveform signal. The control module 12 demodulates the regular digital waveform signal to generate a demodulated signal. Subsequently, the audio decoding unit 22 decodes and outputs the demodulated signal, and finally outputs and plays the audio signal to be received through the playing source 23. The playback source 23 may be a coaxial output audio interface or a speaker. The audio decoding unit 22 may be of the type WM 8731. The op-amp filter circuit 20 may comprise a TIA (transimpedance amplifier) and/or a HPF (high pass filter).
Optionally, the control module 12 further includes:
a data synchronization unit 123, configured to perform asynchronous data synchronization processing on the encoded signal;
a DDS generator 125, for converting the coded signal processed by the data synchronization unit into a modulation signal, and outputting the modulation signal to the acceleration switch circuit 14.
Fig. 2 is a schematic diagram of the control module performing digital modulation according to the embodiment of the present invention. Specifically, in order to solve the problems of poor transmission quality of analog audio signals, high difficulty and low efficiency in loading a high-power deep ultraviolet LED Array, the control module 12 may include an FPGA (Field Programmable Gate Array). The deep ultraviolet communication audio transmission device takes FSK as a modulation means and sends digital audio signals (namely the coding signals) to FPGA for modulation processing. For example, as shown in fig. 2, after the single-bit data output by the audio encoding unit 11 with the model of WM8731 enters the FPGA, the data synchronization unit 123 performs a synchronization operation to synchronize the asynchronous data. The DDS IP core generates two sine waves f1 and f2 of different frequencies according to whether the bit stream of the input data is 0 or 1, and after this operation, the baseband signal (i.e., the encoded signal) becomes a modulation signal (i.e., the first digital modulation signal) and is output from the FPGA to the peripheral circuit (e.g., the speed-up switch circuit 14). The FPGA may further have a serial port driving unit 126 according to actual needs, so as to implement serial port driving.
Optionally, the data synchronization unit 123 is further configured to perform asynchronous data synchronization processing on the regular digital waveform signal; the control module 12 further comprises:
the noncoherent demodulator is used for noncoherently demodulating the regular digital waveform signal processed by the data synchronization unit to form a demodulation signal;
and the phase-locked loop is used for carrying out bit synchronization processing on the demodulation signal and outputting the demodulation signal to the audio decoding unit 22.
In particular, the modem unit 124 in the control module 12 includes a non-coherent demodulator and a phase-locked loop. The 8-bit parallel data (i.e., the second digital modulation signal) output by the analog-to-digital conversion unit 21 at the front end is input to the FPGA, and the data synchronization unit 123 performs synchronous processing on the asynchronous data. Then, the processed signal is subjected to incoherent demodulation by the incoherent demodulator, that is, 8-bit parallel data is sent to two paths of digital band-pass filters with center frequencies of f1 and f2, and then subjected to envelope detection and low-pass filter, and symbol decision is performed, and the modem unit 124 generates a bit synchronization signal by using a lead-lag phase-locked loop and outputs the signal subjected to symbol decision as the bit synchronization signal.
Optionally, the control module 12 further includes:
the key unit 121 includes a plurality of keys, and is configured to adjust a working state of the deep ultraviolet communication audio transmission device, where the working state includes one or more of an off state, a signal transmitting state, a signal receiving state, and a signal transmitting and receiving duplex state.
Specifically, by arranging the key unit comprising a plurality of physical keys or virtual keys, a user can adjust the working state of the deep ultraviolet light communication audio transmission device according to actual needs, thereby further contributing to expanding the application field of the deep ultraviolet light communication audio transmission device.
Optionally, the control module 12 further includes:
and the OLED driving unit 122 is configured to control an OLED display screen to display relevant information of the deep ultraviolet light communication audio transmission device. The OLED display screen is used as a structural component of the deep ultraviolet light communication audio transmission device and is used for interacting with a user. The OLED driving unit 122 is used for controlling the OLED display screen to display the related information of the deep ultraviolet light communication audio transmission device. The related information may include current status information (for example, in an audio signal emitting state or an audio signal receiving state) of the euv communication audio transmission device, historical audio information emitted by the euv communication audio transmission device, historical audio information received by the euv communication audio transmission device, and the like, and further includes other information (for example, including a play icon) required by the user. When the OLED display screen is a touch display screen, the OLED driving unit 122 may further perform a corresponding operation according to a touch instruction sent by a user on the OLED display screen. For example, when the user clicks a play icon on the OLED display screen, the OLED driving unit 122 may drive the play source 23 to play the audio signal to be received.
In order to dissipate heat of the deep ultraviolet LED array in time, so as to improve the service life of the deep ultraviolet LED array, optionally, the emission module further includes:
and the heat dissipation unit 17 is arranged at the periphery of the deep ultraviolet LED array 16 and used for performing heat dissipation treatment on the deep ultraviolet LED array 16.
In order to reduce the influence of ambient light on the signal received by the photodetector, thereby further improving the quality of deep ultraviolet light communication, optionally, the receiving module further includes:
and the filter 18 is arranged at the receiving end of the photoelectric detector 19 and used for filtering background light mixed in the second deep ultraviolet modulation optical signal.
Furthermore, the present embodiment further provides a control method of the audio transmission device for deep ultraviolet light communication according to any one of the above embodiments. Fig. 4 is a schematic flowchart of a method for controlling a deep ultraviolet light communication audio transmission device to transmit an audio signal according to an embodiment of the present invention, fig. 5 is a schematic flowchart of a method for controlling a deep ultraviolet light communication audio transmission device to receive an audio signal according to an embodiment of the present invention, and the structure of the deep ultraviolet light communication audio transmission device provided by the embodiment may be referred to fig. 1 to fig. 3. As shown in fig. 1 to fig. 5, the method for controlling an audio transmission device for deep ultraviolet light communication according to this embodiment includes the following steps:
Step S41, receiving an audio signal to be transmitted;
step S42, the audio signal to be sent is coded to form a coded signal;
step S43, modulating the coded signal to form a modulated signal;
step S44, after the modulation signal is loaded to a power supply driving signal of a deep ultraviolet LED array, the deep ultraviolet LED array is driven to emit a first deep ultraviolet modulation light signal;
step S51, receiving the second deep ultraviolet modulation optical signal and converting the second deep ultraviolet modulation optical signal into an electric signal;
step S52, amplifying the electric signal through two-stage negative feedback;
step S53, the electric signal after amplification treatment is judged to form a regular digital waveform signal;
step S54, demodulating the regular digital waveform signal to form a demodulation signal;
and step S55, decoding the demodulated signal and playing.
Optionally, the specific step of modulating the encoded signal includes:
carrying out asynchronous data synchronization processing on the coded signal;
and converting the coded signal subjected to asynchronous data synchronization processing into a modulation signal by a DDS generator.
Optionally, the specific step of demodulating the regular digital waveform signal includes:
Carrying out asynchronous data synchronization processing on the regular digital waveform signal;
carrying out incoherent demodulation on the regular digital waveform signals subjected to asynchronous data synchronization processing to form demodulation signals;
and carrying out bit synchronization processing on the demodulation signal.
The audio transmission device for deep ultraviolet light communication and the control method thereof provided by the embodiment of the invention adopt deep ultraviolet light as a carrier for audio signal transmission, so that high-security data transmission is realized, and the deep ultraviolet light has strong anti-interference capability, thereby effectively improving the transmission quality of audio signals. Meanwhile, the deep ultraviolet communication audio transmission device can be used for non-line-of-sight communication and has the characteristics of high signal-to-noise ratio, no need of tracking and aiming and the like, thereby being beneficial to expanding the application field of the deep ultraviolet communication technology.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The deep ultraviolet communication audio transmission device is characterized by comprising a transmitting module, a receiving module and a control module; wherein:
The transmitting module comprises an audio source, an audio coding unit, a constant current driving unit, an acceleration switch circuit, a transistor driving unit and a deep ultraviolet LED array, wherein the audio source is used for receiving an audio signal to be transmitted; the audio coding unit is used for coding the audio signal to be sent to form a coded signal and then transmitting the coded signal to the control module; the control module is used for modulating the coded signal to form a modulation signal and outputting the modulation signal to the acceleration switch circuit; the constant current driving unit is used for providing a power supply driving signal for the deep ultraviolet LED array, the output end of the constant current driving unit is connected with the acceleration switch circuit, and the acceleration switch circuit loads the modulation signal to the power supply driving signal; the input end of the transistor driving unit is connected with the acceleration switch circuit, and the output end of the transistor driving unit is connected with the deep ultraviolet LED array and is used for driving the deep ultraviolet LED array to emit a first deep ultraviolet modulation optical signal;
the receiving module comprises a photoelectric detector, an operational amplifier filter circuit, an analog-to-digital conversion unit, an audio decoding unit and a playing source, wherein the photoelectric detector is used for receiving a second deep ultraviolet modulation optical signal from the outside and converting the second deep ultraviolet modulation optical signal into an electric signal; the operational amplifier filter circuit is used for amplifying the electric signal through two-stage negative feedback; the analog-to-digital conversion unit is used for judging the amplified electric signal and outputting a regular digital waveform signal; the control module is used for demodulating the regular digital waveform signal to form a demodulation signal; the audio decoding unit is used for decoding the demodulated signal to obtain an audio signal to be received; the playing source is used for playing the audio signal to be received.
2. The deep ultraviolet light communication audio transmission device according to claim 1, wherein the control module further comprises:
the data synchronization unit is used for carrying out asynchronous data synchronization processing on the coding signals;
and the DDS generator is used for converting the coded signal processed by the data synchronization unit into a modulation signal and outputting the modulation signal to the acceleration switch circuit.
3. The DUV communication audio transmission device according to claim 2, wherein said data synchronization unit is further configured to perform asynchronous data synchronization processing on said regular digital waveform signal; the control module further comprises:
the noncoherent demodulator is used for noncoherently demodulating the regular digital waveform signal processed by the data synchronization unit to form a demodulation signal;
and the phase-locked loop is used for carrying out bit synchronization processing on the demodulation signal and outputting the demodulation signal to the audio decoding unit.
4. The deep ultraviolet light communication audio transmission device according to claim 1, wherein the control module further comprises:
and the key unit comprises a plurality of keys and is used for adjusting the working state of the deep ultraviolet communication audio transmission device, and the working state comprises one or more than two of a closing state, a signal transmitting state, a signal receiving state and a signal transmitting and receiving duplex state.
5. The deep ultraviolet light communication audio transmission device according to claim 1, wherein the control module further comprises:
and the OLED driving unit is used for controlling an OLED display screen to display the related information of the deep ultraviolet light communication audio transmission device.
6. The deep ultraviolet light communication audio transmission device according to claim 1, wherein the transmitting module further comprises:
and the heat dissipation unit is arranged at the periphery of the deep ultraviolet LED array and is used for carrying out heat dissipation treatment on the deep ultraviolet LED array.
7. The deep ultraviolet light communication audio transmission device according to claim 1, wherein the receiving module further comprises:
and the filter is arranged at the receiving end of the photoelectric detector and used for filtering background light mixed in the second deep ultraviolet modulation optical signal.
8. A control method of the audio transmission device for deep ultraviolet light communication according to any one of claims 1 to 7, comprising the steps of:
receiving an audio signal to be transmitted;
coding the audio signal to be sent to form a coded signal;
modulating the coded signal to form a modulated signal;
After the modulation signal is loaded to a power supply driving signal of a deep ultraviolet LED array, driving the deep ultraviolet LED array to emit a first deep ultraviolet modulation light signal;
receiving a second deep ultraviolet modulation optical signal and converting the second deep ultraviolet modulation optical signal into an electric signal;
amplifying the electric signal through two-stage negative feedback;
judging the amplified electric signal to form a regular digital waveform signal;
demodulating the regular digital waveform signal to form a demodulated signal;
and decoding the demodulated signal and then playing.
9. The control method of the audio transmission device for deep ultraviolet light communication according to claim 8, wherein the step of modulating the encoded signal comprises:
carrying out asynchronous data synchronization processing on the coded signal;
and converting the coded signal subjected to asynchronous data synchronization processing into a modulation signal by a DDS generator.
10. The method for controlling the audio transmission device for deep ultraviolet light communication according to claim 8, wherein the step of demodulating the regular digital waveform signal comprises:
carrying out asynchronous data synchronization processing on the regular digital waveform signal;
Carrying out incoherent demodulation on the regular digital waveform signals subjected to asynchronous data synchronization processing to form demodulation signals;
and carrying out bit synchronization processing on the demodulation signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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