Audio transmission system based on high-precision photoelectric sensor

Abstract

The invention discloses an audio transmission system based on a high-precision photoelectric sensor, and relates to the technical field of photoacoustic signal conversion, and the system comprises a laser emission module, an optical cable, a photoelectric sensor and a signal reconstruction module. The laser emission module is connected with the decoding unit, and the laser emission module is used for converting a first audio signal generated by the decoding unit into an optical signal; the photoelectric sensor is connected with the laser emission module through an optical cable and is used for converting an optical signal into a current signal; and the signal reconstruction module is connected with the photoelectric sensor and the playing unit, and the signal reconstruction module is used for performing audio signal reconstruction based on the current signal to obtain a second audio signal and transmitting the second audio signal to the playing unit. According to the invention, signal distortion and electromagnetic interference in the long-distance transmission process of the audio signal are effectively suppressed, the audio transmission efficiency and transmission quality are improved, and the distortion rate is reduced.

Description

Technical Field

[0001] This application relates to the field of photoacoustic signal conversion technology, and in particular to an audio transmission system based on a high-precision photoelectric sensor. Background Technology

[0002] With the iterative upgrades of audio processing technology and the continuous growth in demand for high-fidelity audio, optimizing audio transmission solutions has become a core technical problem that urgently needs to be solved in this field. Currently, the mainstream transmission methods mainly include two technical paths: wireless radio frequency transmission and wired physical connections. In wireless transmission, transmission methods based on electromagnetic wave carrier modulation are susceptible to multipath effects and environmental interference, leading to significant signal attenuation and distortion, and are inherently subject to transmission delays due to limitations imposed by encoding and decoding protocols. In the field of wired transmission, although direct physical cable connections can improve signal integrity, their transmission radius is limited by the impedance characteristics of the conductor, making it difficult to overcome the physical medium length limitation to achieve long-distance lossless transmission.

[0003] In some cases, audio signals are susceptible to interference and have a high distortion rate during long-distance transmission, making it difficult to meet the required quality for long-distance audio signal transmission. Summary of the Invention

[0004] The purpose of this application is to provide an audio transmission system based on a high-precision photoelectric sensor.

[0005] To achieve the above objectives, this application provides the following solution.

[0006] This application provides an audio transmission system based on a high-precision photoelectric sensor, connected to a decoding unit and a playback unit respectively. The system comprises: a laser emitting module, an optical cable, a photoelectric sensor, and a signal reconstruction module. The laser emitting module is connected to the decoding unit and converts a first audio signal generated by the decoding unit into an optical signal. The photoelectric sensor is connected to the laser emitting module via the optical cable and converts the optical signal into a current signal. The output current signal of the photoelectric sensor has a precision greater than or equal to 1 μA and a response time in the microsecond range. The photoelectric sensor has a three-layer vertical van der Waals heterojunction structure consisting of a single-layer graphene-material thin film-Si-SiO2 substrate. The signal reconstruction module is connected to both the photoelectric sensor and the playback unit and reconstructs the audio signal based on the current signal to obtain a second audio signal, which is then transmitted to the playback unit.

[0007] Based on the specific embodiments provided in this application, the following technical effects are disclosed.

[0008] This application connects a laser emitting module to a decoding unit, which converts the first audio signal generated by the decoding unit into an optical signal. A photoelectric sensor is connected to the laser emitting module via an optical cable, and the photoelectric sensor converts the optical signal into a current signal. By employing a photoelectric sensor with a three-layer vertical van der Waals heterojunction structure of a single-layer graphene-material thin film-Si-SiO2 substrate, the photogenerated carrier migration process is converted into a current signal output, improving photoelectric conversion efficiency and reducing distortion during long-distance audio transmission. A signal reconstruction module is connected to both the photoelectric sensor and the playback unit, and is used to reconstruct the audio signal based on the current signal to obtain a second audio signal, which is then transmitted to the playback unit. This application effectively suppresses signal distortion and electromagnetic interference during long-distance audio signal transmission, improves audio transmission efficiency and quality, and thus reduces distortion. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structural connection of an audio transmission system based on a high-precision photoelectric sensor, provided as an embodiment of this application.

[0011] Figure 2 This is a schematic diagram of the photoelectric sensor structure provided in an embodiment of this application.

[0012] Figure 3 This is a PCB structure diagram of a photoelectric sensor provided in an embodiment of this application.

[0013] Figure 4 This is a PCB structure diagram of another photoelectric sensor provided in an embodiment of this application.

[0014] Figure 5 This is a schematic diagram illustrating the operation of an audio transmission system based on a high-precision photoelectric sensor, provided as an embodiment of this application.

[0015] Figure reference numerals: Laser emitting module-1; Optical cable-2; Photoelectric sensor-3; Signal reconstruction module-4; Si-SiO2 substrate-31; Material thin film-32; Metal electrode-33 and monolayer graphene-34. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1, as Figure 1 and Figure 5 As shown, this embodiment provides an audio transmission system based on a high-precision photoelectric sensor 3, which is connected to a decoding unit and a playback unit respectively. The audio transmission system based on the high-precision photoelectric sensor 3 includes: a laser emitting module 1, an optical cable 2, a photoelectric sensor 3, and a signal reconstruction module 4.

[0019] The laser emitting module 1 is connected to the decoding unit. The laser emitting module 1 is used to convert the first audio signal generated by the decoding unit into an optical signal; the optical signal is a coherent optical signal.

[0020] The photoelectric sensor 3 is connected to the laser emitting module 1 via the optical cable 2. The photoelectric sensor 3 is used to convert the optical signal into a current signal. The output current signal of the photoelectric sensor 3 has an accuracy greater than or equal to 1μA and a response time in the microsecond range. The structure of the photoelectric sensor 3 is a three-layer vertical van der Waals heterojunction structure consisting of a single-layer graphene 34, a material thin film 32, and a Si-SiO2 substrate 31.

[0021] The signal reconstruction module 4 is connected to the photoelectric sensor 3 and the playback unit respectively. The signal reconstruction module 4 is used to reconstruct the audio signal based on the current signal to obtain the second audio signal, and then transmit the second audio signal to the playback unit.

[0022] Furthermore, the process by which the laser emitting module 1 converts the first audio signal into an optical signal includes the following steps.

[0023] 1) Obtain the first audio signal.

[0024] 2) Based on the audio spectrum characteristics of the first audio signal, perform frequency band matching analysis on the first audio signal to identify the effective signal components; the effective signal components are the signal components of the first audio signal that meet the preset frequency domain conditions.

[0025] 3) Gain compensation is performed on the target effective signal component, and the gain-compensated effective signal component is converted into an optical signal; wherein, the target effective signal component is the effective signal component whose amplitude-frequency characteristics reach the modulation threshold. The effective signal component is obtained by conversion through the semiconductor laser in laser emission module 1.

[0026] Optionally, the laser emitting module 1 is equipped with an adaptive gain control unit, which dynamically adjusts the amplification gain coefficient of the audio signal by calculating the attenuation characteristics of the optical cable 2 transmission path and the signal strength required by the two-dimensional optoelectronic device. The maximum gain can reach 101 times. This gain control significantly improves the modulation depth of the laser in the laser emitting module 1, effectively enhances the output optical power, and ensures that the audio signal modulated on the optical carrier can be completely captured.

[0027] In practical applications, during the transmission of optical signals, the laser emitting module 1 will also simulate the transmission path loss of the optical signal in the curved optical cable 2 based on the ray tracing algorithm, and adjust the power accordingly; when the light intensity at the receiving end is detected to be lower than the preset sensitivity threshold, the power of the transmitting end will be dynamically adjusted.

[0028] Furthermore, such as Figure 2 As shown, the photoelectric sensor 3 includes, from bottom to top, a Si-SiO2 substrate 31, a material thin film 32, a metal electrode 33, and a single-layer graphene 34.

[0029] In practical applications, such as Figure 2 As shown, the gray rods on the left and right are wires. The wire on the left is connected to a copper sheet, and the wire on the right is connected to a metal electrode. In other words, the left wire goes up to the copper sheet, then to the material, then to the electrode, and then back to the wire to form a circuit. The electrode is the signal output terminal.

[0030] The fabrication process of the high-precision photoelectric sensor 3 is further described in the following steps.

[0031] 1) Etch a groove of a predetermined depth on the Si-SiO2 substrate 31; the groove is square in shape.

[0032] Furthermore, the preset depth is 300nm.

[0033] Optionally, the groove can be a microcavity structure.

[0034] 2) A material thin film 32 is prepared on a Si-SiO2 substrate 31 by laser pulse deposition.

[0035] Furthermore, the material film 32 is a Sn-WSe2 film.

[0036] 3) A metal electrode 33 is etched in the groove on the material thin film 32 by photolithography and gold plating; the metal electrode 33 is square in shape.

[0037] 4) The monolayer graphene 34 is transferred to the material film 32 and the metal electrode 33 by a wet transfer method.

[0038] In practical applications, the key to the photoelectric conversion achieved by the high-precision photoelectric sensor 3 of this application lies in the fact that the quantum efficiency characteristics of the heterojunction device first promote the effective migration of photogenerated carriers, and then convert this physical migration process into a measurable current signal output. Specifically, the received audio signal is first subjected to frequency band matching analysis to identify the effective signal component that meets the preset frequency domain conditions, and to determine whether the amplitude-frequency characteristics of the effective signal component reach the modulation threshold. If so, the laser driving circuit is activated to perform gain compensation on the effective signal. Based on the constructed matching model between the input signal and the nonlinear response of the laser, the required bias current is calculated through the preset modulation depth, and the driving voltage of the laser is dynamically adjusted to find a suitable light intensity power at the transmitting end. The effective signal is then converted into a coherent optical signal by a semiconductor laser of a preset wavelength.

[0039] Furthermore, the PCB board structure diagram of photoelectric sensor 3 is as follows: Figures 3-4 As shown; where the optical signal receiving band of photoelectric sensor 3 is 365-1064nm.

[0040] Furthermore, the diameter of optical cable 2 is 1.5mm. Optical cable 2 is a transparent plastic optical cable.

[0041] In practical applications, the optimized design of the optical cable 2 diameter reduces modal dispersion while ensuring mechanical strength. Combined with the high carrier mobility of the single-layer graphene 34 in the photoelectric sensor 3, the system can still maintain a signal-to-noise ratio of over 94dB in complex electromagnetic environments.

[0042] Furthermore, the maximum signal gain of signal reconstruction module 4 is 110 times.

[0043] Furthermore, the process of reconstructing the audio signal based on the current signal to obtain the second audio signal by the signal reconstruction module 4 specifically includes the following steps.

[0044] 1) Obtain the current signal.

[0045] 2) The power supply ripple interference in the current signal is eliminated by filtering to obtain the filtered current signal.

[0046] 3) Based on the dynamic range of the filtered current signal, manually switch the gain level to enhance the filtered current signal and obtain the enhanced current signal.

[0047] 4) Convert the enhanced current signal into a second audio signal for output.

[0048] In practical applications, signal reconstruction module 4 first filters out noise interference and amplified signals outside the 20-20kHz range from the current signal, and then reconstructs the second audio signal output through its audio power amplifier (Class AB audio amplifier). Furthermore, signal reconstruction module 4 and power management module can work together to establish a two-stage amplification closed-loop control system by dynamically adjusting the drive voltage of the TDA2030AL power amplifier. Specifically, the power management module linearly adjusts the operating voltage within the 12-24V range in 0.5V increments based on the signal-to-noise ratio characteristics of the reconstructed signal, adapting the audio output power to different load requirements. Through this two-stage gain optimization, high-fidelity transmission of the audio signal across the optical and electrical domains is achieved.

[0049] The technical effects of this application are as follows.

[0050] This application adopts a three-stage architecture of optical emission-fiber transmission-photoelectric conversion, specifically including: a laser emission module that filters valid audio signals through frequency band matching analysis and modulation threshold judgment, and then converts them into optical signals in the 365-1064nm band (through a semiconductor laser); low-loss transmission is achieved using a 1.5mm diameter plastic optical fiber; the signal receiving end is designed with a high-sensitivity amorphous semi-metallic Sn-WSe2 heterojunction broadband photodetector, which grows a Sn-WSe2 material film on a Si-SiO2 substrate using pulsed laser deposition technology, and transfers a single layer of graphene to the material surface through wet transfer to form a three-layer vertical van der Waals heterojunction structure of graphene-Sn-WSe2-silicon, achieving high quantum efficiency photoelectric conversion; the signal reconstruction module outputs the audio signal through 20-20kHz bandpass filtering and power amplification. This application features low transmission loss and high signal-to-noise ratio (>90dB), making it particularly suitable for long-distance audio transmission scenarios requiring high fidelity. Through heterojunction carrier migration mechanism and spectral feature pre-analysis technology, it effectively suppresses signal distortion and electromagnetic interference problems.

[0051] It should be understood that the above embodiments are merely illustrative of the technical concept of this application, and those skilled in the art can make various modifications and improvements within the scope of protection defined in the claims. For example, but not limited to, equivalent substitutions of technical features such as using different types of power amplifiers, adjusting the gain adjustment step size, and expanding the voltage adjustment range should all be considered to fall within the scope of patent protection of this application.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An audio transmission system based on a high-precision photoelectric sensor, connected to a decoding unit and a playback unit respectively, characterized in that, The audio transmission system based on a high-precision photoelectric sensor includes: a laser emitting module, an optical cable, a photoelectric sensor, and a signal reconstruction module; The laser emitting module is connected to the decoding unit, and the laser emitting module is used to convert the first audio signal generated by the decoding unit into an optical signal. The photoelectric sensor is connected to the laser emitting module via the optical cable. The photoelectric sensor is used to convert optical signals into current signals. The output current signal of the photoelectric sensor has an accuracy greater than or equal to 1 μA and a response time in the microsecond range. The photoelectric sensor has a three-layer vertical van der Waals heterojunction structure consisting of a single-layer graphene-material thin film-Si-SiO2 substrate. The signal reconstruction module is connected to the photoelectric sensor and the playback unit respectively. The signal reconstruction module is used to reconstruct the audio signal based on the current signal to obtain a second audio signal, and transmit the second audio signal to the playback unit.

2. The audio transmission system for a high-precision photoelectric sensor according to claim 1, characterized in that, The photoelectric sensor comprises, from bottom to top, a Si-SiO2 substrate, a thin film, a metal electrode, and a single layer of graphene.

3. The audio transmission system for a high-precision photoelectric sensor according to claim 2, characterized in that, The fabrication process of the high-precision photoelectric sensor is as follows: A groove of a predetermined depth is etched on the Si-SiO2 substrate; the groove is square in shape. The material thin film was prepared on the Si-SiO2 substrate by laser pulse deposition. Metal electrodes are etched into grooves on the material film using photolithography and gold plating; the metal electrodes are square in shape. The monolayer graphene is transferred to the material film and the metal electrode using a wet transfer method.

4. The audio transmission system for a high-precision photoelectric sensor according to claim 3, characterized in that, The preset depth is 300nm.

5. The audio transmission system for a high-precision photoelectric sensor according to claim 2, characterized in that, The material film is a Sn-WSe2 film.

6. The audio transmission system for a high-precision photoelectric sensor according to claim 1, characterized in that, The optical signal receiving band of the photoelectric sensor is 365-1064nm.

7. The audio transmission system for a high-precision photoelectric sensor according to claim 1, characterized in that, The process by which the laser emitting module converts the first audio signal into an optical signal specifically includes: Acquire the first audio signal; Based on the audio spectrum characteristics of the first audio signal, a frequency band matching analysis is performed on the first audio signal to identify effective signal components; the effective signal components are the signal components of the first audio signal that meet the preset frequency domain conditions. Gain compensation is performed on the target effective signal component, and the gain-compensated effective signal component is converted into an optical signal; wherein, the target effective signal component is the effective signal component whose amplitude-frequency characteristics reach the modulation threshold.

8. The audio transmission system for a high-precision photoelectric sensor according to claim 1, characterized in that, The process by which the signal reconstruction module reconstructs the audio signal based on the current signal to obtain the second audio signal specifically includes: Acquire current signal; The power supply ripple interference in the current signal is eliminated by filtering to obtain the filtered current signal; The gain level is switched according to the dynamic range of the filtered current signal to enhance the filtered current signal and obtain the enhanced current signal. The enhanced current signal is converted into a second audio signal for output.

9. The audio transmission system for a high-precision photoelectric sensor according to claim 1, characterized in that, The diameter of the optical cable is 1.5 mm.

10. The audio transmission system for the high-precision photoelectric sensor according to claim 1, characterized in that, The maximum signal gain of the signal reconstruction module is 110 times.

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