A voice communication system based on deep ultraviolet light

Abstract

This invention belongs to the field of communication technology and discloses a voice communication system based on deep ultraviolet light. The system includes: a voice communication terminal, a transmitting information processing module, an electro-optical conversion module, a transmitting optical system, a receiving optical system, a photoelectric conversion module, and a receiving information processing module. Compared with traditional radio frequency communication, ultraviolet light has excellent anti-interference and anti-interception capabilities; compared with point-to-point communication in the deep infrared band, ultraviolet light has non-line-of-sight characteristics, enabling communication even in jungle warfare. This invention uniquely employs FMCW (Frequency Modulated Continuous Wave) modulation. FMCW encodes bit information as a continuous increase or decrease in frequency. The receiving end obtains the difference frequency signal through mixing, which can be demodulated using matched filtering or Fourier transform, significantly improving processing gain and noise immunity. Even under weak scattered light conditions, signals can be reliably extracted from strong backgrounds, greatly improving communication link margin.

Description

Technical Field

[0001] This invention belongs to, but is not limited to, the field of communication technology, and particularly relates to a voice communication system based on deep ultraviolet light. Background Technology

[0002] With the development of optical communication technology, using light as an information carrier for wireless transmission has gradually become an important supplementary path to traditional radio frequency communication. In typical optical communication systems, the transmitter usually modulates an electrical signal onto an optical carrier, which is then transmitted through free space or optical fiber. At the receiver, the original information is recovered through photoelectric conversion and demodulation. Among various forms of optical communication, deep ultraviolet (UV-C band) communication, due to its strong scattering characteristics in the atmosphere, can achieve non-line-of-sight (NLOS) propagation, and is gradually becoming an important research direction for short-range covert communication in complex environments. Especially in jungles, urban warfare, or scenarios with severe obstruction, traditional infrared or visible light communication relies on line-of-sight links and is easily affected by obstruction, while deep ultraviolet communication can achieve diffraction propagation by utilizing atmospheric molecules and aerosols, thus possessing unique advantages. At the same time, existing research has shown that ultraviolet scattering communication systems based on LED transmitters and photomultiplier tube (PMT) receivers have achieved stable transmission over a certain distance and at a certain rate.

[0003] Regarding modulation methods, existing ultraviolet (UV) communication systems mostly employ pulse position modulation (PPM), on / off keying (OOK), or simple frequency shift modulation. While these modulation methods are simple to implement, they are susceptible to multipath effects and time spread in complex scattering channels, leading to significant inter-symbol interference (ISI) and reduced system reliability. Furthermore, since deep UV communication typically operates under low signal-to-noise ratio (SNR) conditions, existing systems often rely on high-sensitivity detectors and complex synchronization mechanisms, further increasing system complexity. On the other hand, in some optical communication and laser ranging systems, frequency modulated continuous wave (FMCW) technology has been proven to achieve high-precision information recovery through difference frequency detection, exhibiting strong noise immunity and distance resolution. However, its application in deep UV LED communication systems remains relatively limited.

[0004] Existing deep ultraviolet (DUV) communication systems typically employ simple current modulation or direct drive methods at the circuit structure level. The tight coupling between the modulated signal and the LED drive current at the transmitting end makes it difficult to simultaneously achieve modulation linearity and luminous efficiency, easily leading to signal distortion or limited modulation bandwidth. At the receiving end, systems often rely on single signal amplification and decision mechanisms, lacking effective utilization of frequency domain characteristics, making stable demodulation difficult in environments with strong background noise or scattering. Furthermore, most existing systems lack a collaborative design mechanism from modulation, transmission, propagation to demodulation, and there is a lack of a unified signal processing framework among the modules, resulting in limited overall system performance and difficulty in achieving a balance between high robustness and high security in complex environments.

[0005] Therefore, in deep ultraviolet communication scenarios involving non-line-of-sight, high scattering, and strong noise environments, existing technologies generally suffer from insufficient anti-interference capabilities of modulation methods, severe coupling of transmit link parameters, a single demodulation mechanism at the receiver, and a lack of closed-loop collaborative optimization of the overall system. These problems are particularly prominent in covert battlefield communication or voice transmission in complex environments, necessitating the introduction of new modulation mechanisms, optimization of transmit drive structures, and the construction of a demodulation system based on frequency domain processing to simultaneously improve communication reliability and concealment. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a voice communication system based on deep ultraviolet light.

[0007] This invention is implemented as follows: a voice communication system based on deep ultraviolet light. The system includes a transmission link and a reception link. The transmission link includes: an FMCW encoding and modulation module for converting the signal to be transmitted into a frequency-modulated signal with continuously increasing or decreasing frequency; a constant current source; a bias circuit composed of an inductor and a capacitor, one end of the inductor being connected to the output of the constant current source and the anode of the ultraviolet LED, one end of the capacitor being connected to the output of the FMCW encoding and modulation module, and the other end of the capacitor being connected to the anode of the ultraviolet LED; and an ultraviolet LED with its cathode grounded. The reception link includes: a photomultiplier tube; an aspherical lens positioned before the light incident surface of the photomultiplier tube; a filter positioned before the aspherical lens; and an FMCW decoding module connected to the output of the photomultiplier tube for mixing the electrical signal output by the photomultiplier tube to obtain a difference frequency signal and demodulating the original signal.

[0008] Furthermore, the transmission link also includes a voice communication terminal, which includes a microphone, a speaker, and a data acquisition module. The microphone acquires sound waves and converts them into electrical signals, which are then input to the FMCW encoding and modulation module.

[0009] Furthermore, the FMCW encoding and modulation module includes an FPGA board and an ADC acquisition board. The FPGA board is used for data buffering and generating incrementing or decrementing frequency control words, and the ADC acquisition board is used to convert digital frequency modulation signals into analog frequency modulation signals.

[0010] Furthermore, the transmission link also includes a high-speed driving MOS transistor, which is connected between the second end of the capacitor element and the anode of the ultraviolet LED to amplify the frequency modulation signal.

[0011] Another object of the present invention is to provide a voice communication transmitting device based on deep ultraviolet light, comprising: an FMCW encoding modulation module for converting an audio signal into a frequency modulation signal with continuously increasing or decreasing frequency; a constant current source; a bias circuit composed of an inductor and a capacitor, wherein a first end of the inductor is connected to the output terminal of the constant current source, and a second end of the inductor is used to connect to the anode of the ultraviolet LED; a first end of the capacitor is connected to the output terminal of the FMCW encoding modulation module, and a second end of the capacitor is used to connect to the anode of the ultraviolet LED; and an ultraviolet LED, the cathode of which is grounded.

[0012] Furthermore, it also includes an emission optical system, which includes a focusing lens disposed on the light-emitting surface of the ultraviolet LED for focusing and collimating the light emitted by the ultraviolet LED.

[0013] Furthermore, the FMCW encoding and modulation module includes an FPGA board and an ADC acquisition board. The FPGA board performs FMCW encoding internally, and the ADC acquisition board outputs an analog frequency modulation signal.

[0014] Another objective of this invention is to provide a voice communication receiving device based on deep ultraviolet light, comprising: a filter; an aspherical lens; a photomultiplier tube, the light incident surface of which faces the outgoing light of the aspherical lens; and an FMCW decoding module connected to the output end of the photomultiplier tube, used to mix the electrical signal output by the photomultiplier tube to obtain a difference frequency signal, and to recover the original signal by the increasing or decreasing law of the demodulation frequency.

[0015] Furthermore, the FMCW decoding module includes an FPGA board and an ADC acquisition board. The ADC acquisition board is used to acquire the analog electrical signal output by the photomultiplier tube, and the FPGA board is used to perform mixing operations and difference frequency signal demodulation.

[0016] Furthermore, the filter is a solar-blind ultraviolet filter with a passband wavelength of 200 nanometers to 280 nanometers.

[0017] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0018] First, compared with traditional radio frequency communication, ultraviolet light has good anti-interference and anti-interception capabilities.

[0019] Compared to traditional radio frequency (RF) communication, ultraviolet (UV) light has extremely strong anti-interference and anti-interception capabilities. RF signals are easily eavesdropped on and interfered with, while UV light attenuates rapidly and scatters strongly when propagating in the atmosphere. Its non-line-of-sight path makes it difficult for eavesdroppers to capture the complete signal, making it particularly suitable for secure communication scenarios.

[0020] Unlike point-to-point communication in the deep infrared band, ultraviolet light supports non-line-of-sight (NLOS) transmission. Infrared communication requires strict alignment between the transmitting and receiving ends, and is easily interrupted in obstructed environments such as jungles and urban streets. This invention utilizes the atmospheric scattering characteristics of ultraviolet light, so that even if there is no direct path between the transmitting and receiving ends, the signal can reach the other party through particle scattering, ensuring communication continuity in complex battlefield or obstacle-prone environments.

[0021] Compared to visible light communication, this invention operates in the solar-blind ultraviolet band (200-280 nm). Solar radiation in this band is strongly absorbed by the Earth's ozone layer, resulting in extremely low background noise and a naturally superior signal-to-noise ratio. This allows the system to achieve reliable communication over medium distances (hundreds of meters to several kilometers) with relatively low transmission power, offering both stealth and low power consumption advantages.

[0022] This invention uniquely employs FMCW (Frequency Modulated Continuous Wave) modulation. Unlike conventional amplitude or pulse width modulations such as OOK and PPM, FMCW encodes bit information as a continuous increase or decrease in frequency. The receiver obtains the difference frequency signal through mixing, which can be demodulated using matched filtering or Fourier transform, significantly improving processing gain and noise immunity. Even under weak scattered light conditions, it can reliably extract signals from strong backgrounds, greatly improving communication link margin.

[0023] Second, the technical solution of this invention fills a technological gap in the industry both domestically and internationally:

[0024] Currently, my country's main combat forces rely primarily on radio and space-based optical communication equipment (1550nm band) for short-range communication. In adversarial environments, the enemy typically possesses sophisticated radio detection, positioning, and jamming systems, employing deep ultraviolet light as the information carrier. This band is not part of the radio frequency spectrum and is completely undetectable by conventional communication reconnaissance satellites, ground radio monitoring stations, and electronic support measures systems, fundamentally mitigating the disadvantages of radio in battlefield operations. In jungle and urban warfare environments, this invention utilizes the strong atmospheric scattering characteristics of deep ultraviolet light, enabling stable communication even under non-line-of-sight conditions, compared to space-based optical communication equipment.

[0025] Meanwhile, modern electronic warfare commonly employs full-band noise suppression, comb-spectrum jamming, and targeted jamming, drastically reducing or even completely blocking the communication range of tactical radios in environments with strong interference. This invention does not use any radio frequency carrier, and all electronic warfare jamming systems are completely ineffective against deep ultraviolet light. When the enemy implements high-power electromagnetic interference, the communication link of this system remains unaffected, serving as a backup communication method after radio communication is suppressed, filling the gap in covert communication under electromagnetic countermeasures.

[0026] Third, the technical solution of this invention overcomes technical bias:

[0027] It is widely believed in the industry that communication during combat must rely on radio due to its wide coverage and mature technology. Optical communication, limited by distance, weather, and aiming constraints, is only suitable for fixed point-to-point links and not for dynamic warfare. This invention breaks this prejudice: for the first time, deep ultraviolet non-line-of-sight communication is introduced into individual soldier-carried equipment, enabling stable communication even in urban areas and jungles where line-of-sight is obstructed. Furthermore, it possesses zero electromagnetic radiation, anti-jamming, and anti-interception capabilities that radio cannot achieve. This proves that optical communication can completely replace or even surpass radio in specific combat scenarios, becoming an effective means of covert battlefield communication. Attached Figure Description

[0028] Figure 1 This is an internal composition diagram of a voice communication system device based on deep ultraviolet light provided in an embodiment of the present invention;

[0029] Figure 2 This is a general flowchart of the equipment provided in the embodiments of the present invention;

[0030] Figure 3 This is a schematic diagram of the driving circuit provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the receiving optics provided in an embodiment of the present invention;

[0032] Figure 5 This is a simulation diagram of frequency modulated continuous wave (FMCW) modulation provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the front side of the PCB provided in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the reverse side of the PCB provided in an embodiment of the present invention;

[0035] In the diagram: 1. Filter; 2. Aspherical lens; 3. Photomultiplier tube (PMT); 4. Integrated circuit board; 5. Interface; 6. Emitting optical system. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] This invention introduces an FMCW coding and modulation module into the transmission link to convert the voice signal into a continuously variable frequency signal. This signal is then capacitively coupled and superimposed onto the constant-current driven ultraviolet LED anode, achieving decoupling control between the modulation signal and the light-emitting driving current. Compared to traditional direct current modulation methods, this approach introduces high-linearity modulation while maintaining stable LED light emission, thereby reducing modulation distortion and expanding the effective bandwidth in complex scattering channels. Simultaneously, a bias network composed of inductors and capacitors creates a shunt path between the high-frequency modulation component and the DC bias component at the circuit level, avoiding dynamic response hysteresis caused by parameter coupling. In the receiving link, a combination of aspherical lenses and filters spatially focuses and filters the deep ultraviolet scattered light, suppressing background noise while increasing the effective signal incident intensity. Furthermore, the high-gain characteristics of a photomultiplier tube enable highly sensitive detection of weak light signals. In terms of signal processing, the FMCW decoding module generates a difference frequency signal through mixing, mapping the modulation information originally distributed in the high-frequency domain to the low-frequency domain. This allows demodulation to be completed without relying on complex synchronization, improving the system's stable recovery capability in low signal-to-noise ratio environments. The above-mentioned technical features work synergistically at the modulation, driving, and demodulation levels, enabling the system to achieve stable continuous voice transmission in non-line-of-sight, high-scattering scenarios.

[0038] Existing deep ultraviolet (DUV) optical communication systems typically employ a direct intensity modulation (DIM) + amplitude decision approach. This approach relies on a single time-domain signal change for information recovery, which is prone to inter-symbol interference accumulation and decision threshold drift in environments with strong scattering, multipath propagation, and significant background noise. System stability depends on a single parameter adjustment and lacks a multi-dimensional collaborative mechanism. This invention departs from this approach, introducing a continuous frequency modulation (CFC) mechanism based on fractional frequency wave (FMCW). This shifts the information delivery method from the amplitude domain to the frequency domain. Through structural reconstruction using capacitive coupling and constant current bias at the transmitter, the modulation and emission paths are separated, freeing signal modulation from the limitations of LED nonlinear characteristics. At the receiver, a frequency-domain demodulation link is constructed through frequency difference processing, enabling information extraction to rely on frequency difference rather than absolute amplitude, fundamentally changing the decision logic of traditional optical communication. This technological approach breaks through the single-processing framework of existing technologies in terms of modulation dimension, circuit structure, and demodulation mechanism, forming a collaborative system across the electrical, optical, and frequency domains. For those skilled in the art, in the absence of clear technical inspiration, it is difficult to directly derive the above-mentioned combination of frequency modulation and circuit decoupling from the traditional intensity modulation system, and its stable demodulation effect in non-line-of-sight scattering channels is also unpredictable, thus demonstrating substantial technical progress.

[0039] like Figure 1 As shown, this embodiment of the invention provides an ultraviolet light communication system, including a filter 1; an aspherical lens 2; a photomultiplier tube (PMT) 3; an integrated board 4; an interface 5; and a transmitting optical system 6.

[0040] It consists of a voice communication terminal, a transmitting information processing module, an electro-optical conversion module, a transmitting optical system, a receiving optical system, a photoelectric conversion module, and a receiving information processing module. For example... Figure 2 As shown, the information processing module collects the sound waves from the microphone, and the FPGA internally buffers the data. After internal FMCW encoding and modulation, the increasing or decreasing signal is transmitted to the photoelectric conversion module. Finally, the optical system focuses the light and emits it into the atmospheric channel. Subsequently, the ultraviolet light scattered by particles in the atmosphere is received, optically filtered and captured, and converted into a digital signal by the photoelectric conversion module. The signal processing module decodes the signal and finally drives the speaker to emit sound waves through the power amplifier.

[0041] The voice communication terminal includes a microphone, speaker, and acquisition module. This module acquires the sound waves emitted by the user and converts them into I2S signals, while also driving the speaker to emit sound waves.

[0042] Transmission information processing module: This module includes an FPGA board and an ADC acquisition board. It acquires analog electrical signals and encodes them using FMCW modulation.

[0043] Electro-optic conversion module: Includes a high-speed driving MOSFET. The system uses a bias circuit and a constant current source to drive the LED to emit a signal. The bias circuit couples the signal to DC or separates the signal. The bias circuit consists of an inductor and a capacitor. The inductor acts as a low-pass filter, blocking DC, while the capacitor acts as a high-pass filter, blocking DC and passing AC.

[0044] The transmitting optical system 6 includes a focusing lens. The transmitting optical system 6 is responsible for focusing and collimating the light signal emitted by the LED array to ensure that the light signal can be transmitted in a directional manner.

[0045] The receiving optical system includes an aspherical lens 2 and a filter 1. This system is responsible for filtering out unwanted DC ultraviolet light and focusing and collimating the light signal emitted by the LED array to ensure that the light signal can be transmitted in a directional manner.

[0046] Photoelectric conversion module: Includes a receiving and processing board. The photoelectric conversion module converts the captured optical signal into an analog electrical signal.

[0047] Receive Information Processing Module: Includes an FPGA board and an ADC acquisition board. The ADC acquisition board acquires the analog electrical signal from the photoelectric conversion module and transmits it to the FPGA for FMCW decoding.

[0048] The ultraviolet communication system provided in this invention is not simply a stacking of hardware modules such as filter 1, aspherical lens 2, photomultiplier tube (PMT) 3, integrated board 4, interface 5, and emitting optical system 6. Instead, it constructs a highly collaborative full-duplex ultraviolet communication mechanism starting from the complete link of signal generation, modulation, transmission, reception, and demodulation. Its unique working principle reflects the functional coupling and parameter matching between various structural units, thereby achieving a technical effect far exceeding the sum of the functions of each component.

[0049] First, in the transmission link, the microphone in the voice communication terminal collects sound waves and generates an I2S digital audio signal through analog-to-digital conversion. This signal is not directly modulated by the light source, but is sent to the FPGA board of the transmission information processing module for data buffering and crucial FMCW (Frequency Modulated Continuous Wave) encoding and modulation. FMCW modulation is one of the core features of this system, converting the amplitude changes of the audio signal into a regular increase or decrease in the carrier frequency. This encoding method forms a strict matching relationship with the decoding algorithm at the subsequent receiving end. Compared with conventional OOK or PPM modulation, FMCW encoding naturally has higher processing gain and anti-interference capability. The encoded digital signal is converted into an analog control quantity by the ADC acquisition board to drive the electro-optic conversion module. This module adopts a unique bias circuit + constant current source superimposed driving architecture: the bias circuit consists of an inductor and a capacitor, where the inductor acts as a low-pass filter to block DC and provide a stable DC bias point for the LED; the capacitor acts as a high-pass filter to block DC and pass AC, coupling the FMCW AC signal to the LED. The constant current source ensures that the LED operates in the optimal linear region. The two work together to enable the LED array to emit ultraviolet light signals carrying FMCW characteristics without distortion. Subsequently, the focusing lens of the emitting optical system 6 focuses and collimates the divergent light emitted by the LED array with high precision, forming a directional ultraviolet beam that is directed into the atmospheric channel.

[0050] In the receiving link, solar-blind ultraviolet light, after being scattered and propagated by atmospheric particles, is first captured by the receiving optical system. This system first uses a narrowband filter 1 to filter out environmental interference such as solar background light, and then uses an aspherical lens 2 to efficiently focus the weak scattered light onto the core of the photoelectric conversion module—the PMT (photomultiplier tube 3). The PMT possesses extremely high sensitivity and nanosecond-level response speed, capable of converting single-photon-level ultraviolet signals into milliampere-level analog current signals, which precisely matches the wide dynamic range and weak signal detection capability required by the transmitting end's FMCW modulation. The ADC acquisition board of the receiving information processing module digitizes the analog signal output by the PMT at a sampling rate strictly synchronized with the transmitting end's symbol rate and sends it to the FPGA. Inside the FPGA, the FMCW decoding algorithm, which is the inverse of the transmitting end's algorithm, is executed. Through matched filtering or fast Fourier transform, the frequency increase / decrease patterns are accurately extracted from the noisy background to recover the original audio data. Finally, the audio data is amplified and used to drive the speaker to restore the sound wave.

[0051] From ensuring linear LED emission through FMCW modulation and bias drive circuitry, to the synergy between the signal processing gain of the PMT high-sensitivity receiver and the FMCW decoding algorithm, and the adaptation of transmitting and receiving optics to the ultraviolet scattering channel, each step of this system forms an interconnected and mutually supportive organic whole. This holistic mechanism is not a simple addition of existing technological features, but a systematic and innovative design to solve the specific technical problem of low-power, interference-resistant voice communication in ultraviolet scattering channels.

[0052] The aforementioned voice chip is the WM8960, which integrates a microphone interface, speaker driver, and ADC / DAC. It can directly acquire voice output I2S data to the MCU, and also receive I2S data to play sound. The transmission information processing module uses an FPGA as the main control core, specifically the XC7A100T, which boasts powerful processing performance and abundant resources. The electro-optical conversion module chip is the MAX3735A, integrating bias current and modulation current control and supporting temperature compensation. The transmitting optical system 6 consists of 12 275nm LED beads, with an array optical power of 1.4W. The receiving optical system comprises an aspherical lens 2 and a 275nm center wavelength filter 1. Filter 1, model NP275, filters out non-communication light and interference sources, while the aspherical lens 2 features low loss and is used for focal length light energy. The photoelectric conversion module consists of a photoelectric sensor (PMT) and a cross-group amplifier circuit. The PMT model is H10720-04, with a spectral response range of 160 to 650 nm, perfectly covering the deep ultraviolet solar blind band. It maintains a high cathode sensitivity of up to 1.0 × 10⁻⁶ at 275 nm. 6 The gain.

[0053] The transimpedance amplifier chip is model OPA381, a high-precision transimpedance amplifier from Texas Instruments, specifically designed for photoelectric detection, featuring high bandwidth and low noise. The main control core of the receiving information processing module is the same as that of the transmitting end, and this part is used for FMCW decoding.

[0054] like Figure 3 The diagram shows the driving circuit. The main control chip samples the current value of the modulation terminal in real time. Based on the sampled current value, the main control chip determines the magnitude of the output control voltage value, so that the LED emits the light power corresponding to the threshold current. Then, the signal level drives the high-speed switching MOSFET to conduct and cut off, modulating the LED, and finally forming the control of the modulation current.

[0055] like Figure 4 The diagram shows the receiving optics. The receiving optics employ an aspherical lens and a narrowband filter 1. The narrowband filter 1 only allows signal light near 275nm to pass through, while completely blocking out-of-band noise. The aspherical lens 2 has lower optical loss and can achieve a shorter focal length, allowing light to focus earlier, thereby reducing the length of the optical system.

[0056] like Figure 5 The diagram shows an FMCW modulation simulation. The FPGA controls the DDS to generate linear frequency modulated waves with different slopes based on the data bits. After being driven and amplified, these waves modulate a deep ultraviolet LED to emit light signals. The light signals reach the receiver via an atmospheric scattering channel. The PMT receives the signals and converts them into electrical signals. These signals are then coherently detected by a mixer and a local reference signal to obtain the difference frequency signal. The frequency of this difference frequency signal carries the original data information. The FPGA performs FFT spectrum analysis on the difference frequency signal to identify the peak frequency positions, thereby demodulating the original data.

[0057] In the description of this invention, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A voice communication system based on deep ultraviolet light, comprising a transmit link and a receive link, characterized in that, The transmission link includes: An FMCW encoding and modulation module is used to convert the signal to be transmitted into a frequency-modulated signal with continuously increasing or decreasing frequency; a constant current source; a bias circuit composed of an inductor and a capacitor, one end of the inductor being connected to the output of the constant current source and the anode of the ultraviolet LED, one end of the capacitor being connected to the output of the FMCW encoding and modulation module, and the other end of the capacitor being connected to the anode of the ultraviolet LED; the ultraviolet LED has its cathode grounded; the receiving link includes: a photomultiplier tube; an aspherical lens placed in front of the light incident surface of the photomultiplier tube; a filter placed in front of the aspherical lens; and an FMCW decoding module connected to the output of the photomultiplier tube, used to mix the electrical signal output by the photomultiplier tube to obtain a difference frequency signal and demodulate the original signal.

2. The voice communication system based on deep ultraviolet light according to claim 1, characterized in that, The transmission link also includes a voice communication terminal, which includes a microphone, a speaker, and a data acquisition module. The microphone acquires sound waves and converts them into electrical signals, which are then input to the FMCW encoding and modulation module.

3. The voice communication system based on deep ultraviolet light according to claim 1, characterized in that, The FMCW encoding and modulation module includes an FPGA board and an ADC acquisition board. The FPGA board is used for data buffering and generating incrementing or decrementing frequency control words, and the ADC acquisition board is used to convert digital frequency modulation signals into analog frequency modulation signals.

4. The voice communication system based on deep ultraviolet light according to claim 1, characterized in that, The transmission link also includes a high-speed driving MOS transistor, which is connected between the second end of the capacitor element and the anode of the ultraviolet LED to amplify the frequency modulation signal.

5. A voice communication transmitting device based on deep ultraviolet light, implementing the voice communication system based on deep ultraviolet light as described in any one of claims 1-4, characterized in that, include: The FMCW encoding and modulation module is used to convert audio signals into frequency modulation signals with continuously increasing or decreasing frequencies. Constant current source; The bias circuit consists of an inductor and a capacitor. The first end of the inductor is connected to the output of the constant current source, and the second end of the inductor is connected to the anode of the ultraviolet LED. The first end of the capacitor is connected to the output of the FMCW encoding and modulation module, and the second end of the capacitor is connected to the anode of the ultraviolet LED. The ultraviolet LED has its cathode grounded.

6. The voice communication transmitting device based on deep ultraviolet light according to claim 5, characterized in that, It also includes a emitting optical system, which includes a focusing lens disposed on the light-emitting surface of the ultraviolet LED for focusing and collimating the light emitted by the ultraviolet LED.

7. The voice communication transmitting device based on deep ultraviolet light according to claim 5, characterized in that, The FMCW encoding and modulation module includes an FPGA board and an ADC acquisition board. The FPGA board performs FMCW encoding internally, and the ADC acquisition board outputs an analog frequency modulation signal.

8. A voice communication receiving device based on deep ultraviolet light, implementing the voice communication system based on deep ultraviolet light as described in any one of claims 1-4, characterized in that, include: Filters; Aspherical lens; A photomultiplier tube, whose light incident surface faces the outgoing light of an aspherical lens; The FMCW decoding module connects to the output of the photomultiplier tube and is used to mix the electrical signal output by the photomultiplier tube to obtain the difference frequency signal. The original signal is then recovered by the increasing or decreasing frequency of the demodulation.

9. The voice communication receiving device based on deep ultraviolet light according to claim 8, characterized in that, The FMCW decoding module includes an FPGA board and an ADC acquisition board. The ADC acquisition board is used to acquire the analog electrical signal output by the photomultiplier tube, and the FPGA board is used to perform mixing operations and difference frequency signal demodulation.

10. The voice communication receiving device based on deep ultraviolet light according to claim 8, characterized in that, The filter is a solar-blind ultraviolet filter with a passband wavelength of 200 nanometers to 280 nanometers.

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