Digital audio underwater visible light energy-carrying communication system based on flexible solar panel

Abstract

The invention provides a digital audio underwater visible light energy-carrying communication system based on a flexible solar panel, which comprises a transmitting end and a receiving end, and is characterized in that at the transmitting end, a visible light signal is used as a transmission medium of audio information, a digital audio signal and a direct current voltage signal are coupled through a Bias-T circuit, and an LED array is driven to emit a modulated light signal; electro-optical conversion of audio data is realized in an underwater complex environment. And at a receiving end, a flexible solar panel is used as receiving equipment, and the equipment can realize large-field-angle detection of audio signals and can also perform energy collection on underwater sunlight and composite light signals, so that the endurance time of underwater equipment is further prolonged. The device has the advantages of being high in structural flexibility, large in receiving field angle, capable of collecting energy and the like, can be conveniently deployed in underwater equipment with limited space, and prolongs the endurance time of devices such as underwater sensors and aircrafts.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater visible light communication, and in particular to a digital audio underwater visible light energy-carrying communication system based on a flexible solar panel. Background Art

[0002] With the continuous development of underwater wireless communication technology, traditional underwater communication methods mainly include technical means such as underwater acoustic communication and radio frequency communication, but these underwater communication technologies have certain limitations. Although underwater acoustic communication can transmit over a long distance, its transmission rate is relatively low, the transmission delay is large, and it is easily interfered by underwater environmental noise. The signal carrier of radio frequency communication is electromagnetic waves, and the propagation loss of electromagnetic waves underwater is particularly large, and the transmission distance is limited. Underwater visible light communication stands out among underwater wireless communication technologies with its advantages of small transmission delay, large transmission bandwidth and no interference from underwater noise. Underwater digital audio visible light transmission technology can transmit the collected underwater biological sounds with low latency, providing key data for scientists to study the activities, habitats and population distribution of marine organisms in real time. In the field of military and marine emergency rescue, underwater digital audio visible light transmission technology can provide low-latency real-time voice communication and real-time underwater audio data collection functions between underwater equipment such as submarines, underwater frogmen and unmanned submersibles, which can make up for the shortcomings of insufficient underwater information interaction capabilities and has broad application prospects.

[0003] However, underwater visible light communication technology still faces many challenges in practical applications. First, the light receiving elements used in existing underwater visible light communication systems, such as photodiodes or photomultiplier tubes, have a small detection area and a limited receiving field of view, which increases the difficulty of aligning the system in complex water environments; second, the internal space of underwater equipment is limited, and the lack of structural flexibility of traditional underwater visible light communication systems will make it difficult to deploy; finally, the energy replenishment methods of underwater equipment are limited, the system power consumption is sensitive, and there is an energy anxiety problem, which greatly limits the working time of underwater equipment. Summary of the invention

[0004] According to the technical problems encountered in underwater digital audio transmission mentioned above, a digital audio underwater visible light energy-carrying communication system based on a flexible solar panel is provided. The present invention can not only realize the wireless transmission of underwater audio signals, but also realize the energy collection function of underwater optical signals. The present invention proposes to use a flexible solar panel as a receiving and detecting device for optical signals, and utilizes its thin and bendable characteristics to enable it to be deployed in a narrow space, and can be effectively bonded and integrated with the surface of underwater equipment. Large-area solar panels increase the field of view of the receiver to detect optical signals, which can greatly reduce the difficulty of alignment of the optical communication system. In addition, the flexible solar panel receiving module in the present invention can detect both composite communication optical signals and sunlight signals, realizing the functions of coordinated detection of communication and energy underwater, and enhancing the endurance of the underwater system.

[0005] The technical means adopted by the present invention are as follows:

[0006] A digital audio underwater visible light energy communication system based on a flexible solar panel comprises: a transmitting end and a receiving end, wherein:

[0007] The transmitting end includes a sound receiving module, an analog-to-digital conversion module and an optical transmitting module; wherein the output port of the sound receiving module is connected to the input port of the analog-to-digital conversion module; the output port of the analog-to-digital conversion module is connected to the input port of the optical transmitting module;

[0008] The receiving end includes a flexible solar panel receiving module, a low-pass filter module, a digital-to-analog conversion module and a playback module; wherein the input port of the flexible solar panel receiving module is connected to the output port of the optical transmission module; the output port of the flexible solar panel receiving module is connected to the input port of the low-pass filter module; the output port of the low-pass filter module is connected to the input port of the digital-to-analog conversion module; and the output port of the digital-to-analog conversion module is connected to the input port of the playback module.

[0009] Further, at the transmitting end:

[0010] The sound receiving module converts the sound signal into an analog signal through a microphone;

[0011] The analog-to-digital conversion module converts the analog signal into a digital signal;

[0012] The optical emission module amplifies the digital signal and couples the amplified digital signal with a DC power supply signal to increase the driving power. The coupled composite current drives the high-power LED array to emit the optical signal.

[0013] Further, at the receiving end:

[0014] The flexible solar panel receiving module converts the optical signal into an electrical signal by using the photoelectric effect of the flexible solar panel; the flexible solar panel receiving module has a built-in signal shunt circuit for separating the DC energy storage signal and the AC communication signal, transmitting the DC energy storage signal to the lithium battery, and transmitting the AC communication signal to the signal amplification circuit;

[0015] The low-pass filtering module performs low-pass filtering on the amplified AC communication signal to improve signal quality and filter out high-frequency noise;

[0016] The digital-to-analog conversion module converts the filtered digital signal into an analog signal;

[0017] The sound playing module plays the original sound signal.

[0018] Furthermore, the optical transmission module is composed of a signal amplification circuit, a Bias-T circuit, and an LED transmission circuit, wherein the digital signal is amplified by the signal amplification circuit to improve the signal quality; the Bias-T circuit couples and multiplexes the AC and DC signals into one signal, and outputs it to the LED light source through intensity modulation to realize the conversion of electrical signals into optical signals; the optical transmission module, on the one hand, improves the driving power to drive the high-power LED array to emit light, and on the other hand, completes the coupling of the DC power supply signal and the AC communication signal at the transmitting end.

[0019] Furthermore, the flexible solar panel receiving module has two output ports, namely a DC output port and a signal output port, wherein the DC output port is connected to the lithium battery charging port, and the signal output port is connected to the input port of the low-pass filter module.

[0020] Furthermore, the flexible solar panel receiving module is composed of a flexible solar panel unit, a signal shunt circuit, a signal amplifier and a lithium battery, wherein the flexible solar panel unit converts the composite optical signal into a coupled electrical signal; after the signal shunt circuit receives the coupled electrical signal, it separates the DC energy storage signal in the coupled electrical signal and transmits it to the lithium battery, and the AC communication signal containing the digital audio signal is transmitted to the signal amplifier for signal amplification.

[0021] Furthermore, the playback module is composed of a power amplifier and a playback speaker, wherein the power amplifier receives an analog audio signal and amplifies the power of the analog audio signal, and transmits the amplified analog audio signal to a 3.5mm audio interface. After the 3.5mm audio interface is connected to headphones, real-time reception of underwater audio is realized.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention provides a digital audio underwater visible light energy-carrying communication system based on a flexible solar panel. At the transmitting end, a visible light signal is used as the transmission medium of audio information, a Bias-T circuit is used to couple the digital audio signal with a DC voltage signal, and an LED array is driven to emit a modulated light signal, thereby realizing the electro-optical conversion of audio data in a complex underwater environment.

[0024] 2. The present invention provides a digital audio underwater visible light energy-carrying communication system based on a flexible solar panel. At the receiving end, a flexible solar panel is used as a receiving module. The module can not only realize a large field-of-view angle detection of digital audio optical signals, but also realize energy collection of underwater optical signals, thereby further improving the endurance of underwater equipment.

[0025] 3. The present invention utilizes the photoelectric conversion effect and the thin, bendable characteristics of flexible solar panels to develop an underwater energy-carrying communication system that can realize underwater audio signal transmission, has high structural flexibility, a large receiving field of view, and has energy collection capabilities. Its flexible solar panel unit utilizes a built-in signal shunt circuit to separate the received DC energy storage signal and AC communication signal to realize the energy-carrying communication function of the system. The digital audio underwater visible light energy-carrying communication method based on flexible solar panels can not only cope with the challenges of underwater acoustic communication technology being susceptible to noise interference, large propagation delay, and high equipment complexity, but also solves the alignment problem faced by traditional underwater wireless optical communication technology.

[0026] 4. The digital audio underwater visible light energy-carrying communication system based on flexible solar panels provided by the present invention has the advantages of high structural flexibility, large receiving field of view and energy collection function. It is easy to be deployed in underwater equipment with limited space, and improves the battery life of devices such as underwater sensors and vehicles.

[0027] Based on the above reasons, the present invention can be widely promoted in the fields of underwater visible light communication and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is the overall framework diagram of the system of the present invention.

[0030] Figure 2 This is a block diagram of the optical transmission module provided in an embodiment of the present invention.

[0031] Figure 3 This is a block diagram of the composition of the flexible solar panel receiving module provided in an embodiment of the present invention.

[0032] Figure 4 This is a block diagram of the low-pass filtering module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] like Figure 1 As shown, the present invention provides a digital audio underwater visible light energy communication system based on a flexible solar panel, comprising: a transmitting end and a receiving end, wherein:

[0036] The transmitting end includes a sound receiving module, an analog-to-digital conversion module and an optical transmitting module; wherein the output port of the sound receiving module is connected to the input port of the analog-to-digital conversion module; the output port of the analog-to-digital conversion module is connected to the input port of the optical transmitting module;

[0037] The receiving end includes a flexible solar panel receiving module, a low-pass filter module, a digital-to-analog conversion module and a playback module; wherein the input port of the flexible solar panel receiving module is connected to the output port of the optical transmission module; the output port of the flexible solar panel receiving module is connected to the input port of the low-pass filter module; the output port of the low-pass filter module is connected to the input port of the digital-to-analog conversion module; and the output port of the digital-to-analog conversion module is connected to the input port of the playback module.

[0038] In specific implementation, as a preferred embodiment of the present invention, at the transmitting end:

[0039] The sound receiving module uses a high-sensitivity microphone to capture sound, converts the sound signal into an analog signal through the microphone, and then uses a signal amplifier to enhance the signal and improve the signal quality for subsequent digital processing. The amplified analog electrical signal is output to the analog-to-digital conversion module through the output port of the sound receiving module.

[0040] The analog-to-digital conversion module converts the analog signal into a digital signal, specifically: the received analog signal is converted into a pulse code modulation format (PCM, Pulse Code Modulation) and a linear PCM format, and is packaged and processed according to the digital audio signal transmission standard of the Audio Engineering Society 2, and then transmitted to the optical transmission module.

[0041] The optical emission module amplifies the digital signal and couples the amplified digital signal with a DC power supply signal to increase the driving power. The coupled composite current drives the high-power LED array to emit the optical signal.

[0042] In specific implementation, as a preferred implementation of the present invention, at the receiving end:

[0043] The flexible solar panel receiving module utilizes the photoelectric effect of the flexible solar panel to convert the optical signal into an electrical signal; the flexible solar panel receiving module has a built-in signal shunt circuit for separating the DC energy storage signal and the AC communication signal, transmitting the DC energy storage signal to the lithium battery, and transmitting the AC communication signal to the signal amplification circuit; that is, the flexible solar panel receiving module can collect electrical energy for the lithium battery on the one hand, and can also receive AC communication signals on the other hand.

[0044] The low-pass filtering module performs low-pass filtering on the amplified AC communication signal to improve signal quality and filter out high-frequency noise;

[0045] The digital-to-analog conversion module converts the filtered digital signal into an analog signal; specifically, the received digital signal is converted into a linear PCM format according to the Audio Engineering Society 2 standard, and then converted into an analog signal by a digital-to-analog conversion chip.

[0046] The sound playing module plays the original sound signal.

[0047] When specifically implemented, as a preferred embodiment of the present invention, Figure 2As shown, the optical transmitter module is composed of a signal amplification circuit, a Bias-T circuit, and an LED transmission circuit, wherein the digital signal is amplified by the signal amplification circuit to improve the signal quality; the Bias-T circuit couples and multiplexes the AC and DC signals into one signal, and outputs it to the LED light source through intensity modulation to realize the conversion of electrical signals into optical signals; the optical transmitter module improves the driving power to drive the high-power LED array to emit light, and on the other hand, completes the coupling of the DC power supply signal and the AC communication signal at the transmitting end.

[0048] In specific implementation, as a preferred embodiment of the present invention, the flexible solar panel receiving module has two output ports, namely a DC output port and a signal output port, wherein the DC output port is connected to the lithium battery charging port, and the signal output port is connected to the input port of the low-pass filter module.

[0049] When specifically implemented, as a preferred embodiment of the present invention, Figure 3 As shown, the flexible solar panel receiving module is composed of a flexible solar panel unit, a signal shunt circuit, a signal amplifier and a lithium battery, wherein the flexible solar panel unit converts the composite optical signal into a coupled electrical signal; after the signal shunt circuit receives the coupled electrical signal, it separates the DC energy storage signal in the coupled electrical signal and transmits it to the lithium battery, and the AC communication signal containing the digital audio signal is transmitted to the signal amplifier for signal amplification.

[0050] In specific implementation, as a preferred embodiment of the present invention, the playback module is composed of a power amplifier and a playback speaker, wherein the power amplifier receives an analog audio signal and amplifies the analog audio signal, and transmits the amplified analog audio signal to a 3.5mm audio interface. After the 3.5mm audio interface is connected to headphones, real-time reception of underwater audio is realized.

[0051] When specifically implemented, as a preferred embodiment of the present invention, Figure 4 The block diagram of the low-pass filter module is shown. The low-pass filter module circuit diagram relies on hardware circuits to filter out the high-frequency noise components of the signal. The cutoff frequency of the low-pass filter module circuit diagram is as follows:

[0052]

[0053] The capacitive reactance can be expressed as:

[0054]

[0055] Considering that the frequency range of the sound signal is 20Hz~20kHz, the cutoff frequency of the low-pass filter module is set to 0.8MHz, and the front-stage output resistance is 50Ω. Because the resistance impedance of the RC low-pass filter circuit is much larger than the front-stage output impedance, and the capacitance impedance is much smaller than the rear-stage input impedance, the resistance R in the low-pass filter circuit is 500Ω and the capacitance is 4pF.

[0056] Through the collaborative work of the above modules, the digital audio underwater visible light energy-carrying communication system based on flexible solar panels can effectively complete the wireless communication of underwater audio signals and realize the energy collection function of underwater optical signals. The design of this system cleverly utilizes the characteristics of flexible solar panels that are thin, bendable, and have a large receiving field angle, which not only enables the system to meet the deployment requirements of narrow underwater spaces, but also improves the receiving area and receiving field angle of visible light signals. Through the reasonable separation and utilization of energy and information flow in optical signals, the present invention effectively expands its application scenarios in narrow spaces or unattended underwater equipment, while further improving the energy utilization efficiency of underwater visible light communications. It demonstrates its innovation and practicality in the field of underwater visible light communication and energy transmission.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital audio underwater visible light energy communication system based on flexible solar panels, characterized in that: include: Transmitter and receiver, where: The transmitting end includes a sound receiving module, an analog-to-digital conversion module and an optical transmitting module; wherein the output port of the sound receiving module is connected to the input port of the analog-to-digital conversion module; the output port of the analog-to-digital conversion module is connected to the input port of the optical transmitting module; The receiving end includes a flexible solar panel receiving module, a low-pass filter module, a digital-to-analog conversion module and a playback module; wherein the input port of the flexible solar panel receiving module is connected to the output port of the optical transmission module; the output port of the flexible solar panel receiving module is connected to the input port of the low-pass filter module; the output port of the low-pass filter module is connected to the input port of the digital-to-analog conversion module; and the output port of the digital-to-analog conversion module is connected to the input port of the playback module.

2. According to claim 1, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: At the transmitting end: The sound receiving module converts the sound signal into an analog signal through a microphone; The analog-to-digital conversion module converts the analog signal into a digital signal; The optical emission module amplifies the digital signal and couples the amplified digital signal with a DC power supply signal to increase the driving power. The coupled composite current drives the high-power LED array to emit the optical signal.

3. According to claim 1, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: At the receiving end: The flexible solar panel receiving module converts the optical signal into an electrical signal by using the photoelectric effect of the flexible solar panel; the flexible solar panel receiving module has a built-in signal shunt circuit for separating the DC energy storage signal and the AC communication signal, transmitting the DC energy storage signal to the lithium battery, and transmitting the AC communication signal to the signal amplification circuit; The low-pass filtering module performs low-pass filtering on the amplified AC communication signal to improve signal quality and filter out high-frequency noise; The digital-to-analog conversion module converts the filtered digital signal into an analog signal; The sound playing module plays the original sound signal.

4. According to claim 2, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: The optical transmission module is composed of a signal amplification circuit, a Bias-T circuit, and an LED transmission circuit, wherein the digital signal is amplified by the signal amplification circuit to improve the signal quality; the Bias-T circuit couples and multiplexes the AC and DC signals into one signal, and outputs it to the LED light source through intensity modulation to realize the conversion of electrical signals into optical signals; the optical transmission module improves the driving power to drive the high-power LED array to emit light, and on the other hand, completes the coupling of the DC power supply signal and the AC communication signal at the transmitting end.

5. According to claim 3, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: The flexible solar panel receiving module has two output ports, namely a DC output port and a signal output port, wherein the DC output port is connected to the lithium battery charging port, and the signal output port is connected to the input port of the low-pass filter module.

6. According to claim 3, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: The flexible solar panel receiving module is composed of a flexible solar panel unit, a signal shunt circuit, a signal amplifier and a lithium battery, wherein the flexible solar panel unit converts the composite optical signal into a coupled electrical signal; after the signal shunt circuit receives the coupled electrical signal, it separates the DC energy storage signal in the coupled electrical signal and transmits it to the lithium battery, and the AC communication signal containing the digital audio signal is transmitted to the signal amplifier for signal amplification.

7. According to claim 3, a digital audio underwater visible light energy communication system based on a flexible solar panel is characterized in that: The playback module consists of a power amplifier and a playback speaker, wherein the power amplifier receives an analog audio signal and amplifies the power of the analog audio signal, and transmits the amplified analog audio signal to a 3.5mm audio interface. After the 3.5mm audio interface is connected to headphones, real-time reception of underwater audio is realized.

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