A Long-Distance Visible Light Voice Transmission System Based on LED Array

Abstract

This invention discloses a long-distance visible light voice transmission system based on an LED array, relating to the field of optical lighting technology. The system includes a correction module for correcting alignment deviations between the LED array and optical components; a modulation module for generating a modulation signal corresponding to the voice signal; a light-emitting module for applying the modulation signal to the LED array to emit visible light of the corresponding frequency; a focusing module for efficiently focusing the visible light through the optical components to form a long-distance transmission beam; and a demodulation module for demodulating the received light signal to restore the original voice signal. This long-distance visible light voice transmission system based on an LED array reduces product maintenance costs, shortens system debugging time, improves production efficiency, is suitable for diverse application environments, and solves the problem of poor light focusing caused by the difficulty of precise alignment between the LED array and optical components in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of optical lighting technology, and more specifically to a long-distance visible light emission system for voice based on an LED array. Background Technology

[0002] In the current lighting and display fields, LED arrays are widely used due to their high efficiency, long lifespan, and low energy consumption. However, the light output of an LED array typically needs to be modulated by optical components (such as lenses or reflectors) to meet specific optical requirements, such as uniform distribution, directional illumination, or high-precision projection. Alignment between the optical components and the LED array is a crucial step in achieving these functions.

[0003] In existing technologies, LED arrays and optical components are typically mounted using mechanical fixing methods. A major problem with this approach is the difficulty in achieving high-precision alignment. Due to the characteristics of the light output from LED arrays, even slight offsets or tilts can lead to a significant decrease in the focusing effect, manifesting as uneven light distribution, blurred spot edges, or shifts in the energy concentration area. This alignment error not only affects the efficiency of the optical system but can also lead to instability in its optical performance. Furthermore, existing alignment solutions often require costly precision adjustment mechanisms or complex calibration processes, which further increases manufacturing costs and debugging time, limiting the application of this technology in mass production. This alignment problem is particularly pronounced in scenarios with high optical performance requirements, such as automotive lighting, high-end display devices, and medical imaging equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a long-distance visible light emission system for voice based on an LED array, which solves the problem of poor light focusing caused by the difficulty of precise alignment between the LED array and optical components in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a long-distance visible light voice transmission system based on an LED array, the system comprising:

[0006] The calibration module is used to correct alignment deviations of the LED array and optical components;

[0007] The modulation module is used to generate a modulation signal corresponding to the speech signal;

[0008] The light-emitting module, connected to the modulation module and the correction module, is used to apply the modulation signal to the LED array so that it emits visible light of the corresponding frequency;

[0009] The focusing module, connected to the light-emitting module, is used to efficiently focus visible light through optical components to form a long-distance transmission beam. Specifically, it optimizes the focusing performance of the optical components based on a perspective scaling model, using the following formula:

[0010] Where h′ represents the size of the beam or target image after focusing by the optical components, f represents the focal length of the lens, d represents the object distance, and h represents the size of the light-emitting area of ​​the light source;

[0011] Based on the relative position of the light source and the target receiver, the focal length and position of the lens are adjusted in real time to verify the shape and energy density distribution of the focused beam.

[0012] The demodulation module, connected to the focusing module, demodulates the received optical signal and restores it to the original audio signal. Specifically, it analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies it. The specific formula is: P(t) = P0e -λt ;

[0013] Where P(t) represents the intensity of signal propagation, P0 represents the initial intensity of the signal, λ represents the signal attenuation coefficient, and t represents time;

[0014] Analyze the modulation frequency distribution of the signal and restore it to the original speech signal by combining the modulation rules.

[0015] Preferably, the correction module corrects alignment deviations of the LED array and optical components by:

[0016] The initial deviation between the LED array and the optical components is collected, and the optimal adjustment path and required torque of the optical components in multi-dimensional space are calculated. The specific formula is: τ = J T ·F;

[0017] Where τ represents the adjustment torque of the correction module, i.e., the adjustment intensity required during the correction process; J represents the Jacobian matrix, which represents the geometric relationship and adjustment path between the LED array and the optical components; and F represents the correction force required to be applied for the initial deviation measured by the sensor during the alignment of the optical components. T This represents the transpose of J.

[0018] Preferably, the modulation module generates a modulation signal corresponding to the speech signal by including:

[0019] The frequency range of the speech signal is mapped to the equivalent frequency range of molecular vibrations. The speech signal is encoded into an equivalent vibrational frequency modulation signal. This modulation signal is applied to the driving circuit of the LED array to control the LED array to emit corresponding modulated visible light. The vibrational frequency is adjusted according to the real-time changes in the speech signal. The specific formula for adjusting the vibrational frequency is as follows:

[0020] Where ω represents the frequency of the modulated signal generated from the speech signal, k represents the rigidity of the frequency change in the modulated signal, and μ represents the inertia parameter.

[0021] Preferably, the light-emitting module applies a modulation signal to the LED array to make it emit visible light of a corresponding frequency, including:

[0022] Based on ambient light conditions and signal strength feedback from the receiver, the luminous intensity and direction of the LED array are dynamically adjusted to optimize its thermal management performance. The specific formula is as follows:

[0023] Where I represents the luminous intensity of the LED array at a distance r, I0 represents the maximum luminous intensity of the LED array when it emits or the initial intensity of the beam, γ represents the rate of light intensity decay with distance r, and r represents the propagation distance of the light from the LED array to the target receiver.

[0024] Preferably, the correction module for correcting alignment deviations between the LED array and the optical components further includes:

[0025] Obtain the actual positional deviation of the LED array and optical components:

[0026] Compare the actual position deviation with the preset deviation range;

[0027] If the actual position deviation exceeds the preset deviation range, adjust the position of the LED array or optical components to reduce the deviation;

[0028] After calibration, the alignment deviation of the LED array and optical components is checked again to ensure that it is within the preset deviation range.

[0029] Preferably, obtaining the actual positional deviation of the LED array and optical components includes:

[0030] The actual relative positions between the LED array and optical components are determined using a laser measuring instrument.

[0031] The relative position images of the LED array and optical components are captured by an image sensor;

[0032] The actual positional deviation Δd between the LED array and the optical components is calculated based on the captured image data, where Δd = |d| 实测 -d 理论 |,d 实测 Indicates the measured position, d 理论 Indicates the design location.

[0033] Preferably, the calculation of the actual positional deviation Δd between the LED array and the optical components based on the captured image data includes:

[0034] Edge detection is performed on the image data to identify the edge positions of the LED array and optical components;

[0035] The coordinates of the center points of the two points are calculated based on their edge positions and denoted as P1 and P2, respectively.

[0036] The formula is used to calculate the actual position deviation.

[0037] Where (x1, y1) are the coordinates of P1, and (x2, y2) are the coordinates of P2.

[0038] Preferably, after calculating the actual position deviation, Δd is compared with a preset threshold δ, where δ = k × σ, k is a constant, and σ is the standard deviation of the actual position deviation. If Δd > δ, the position is adjusted and re-detected until Δd ≤ δ.

[0039] Preferably, step S1 further includes obtaining the relative offset of the LED array and optical components at different positions, and calculating alignment correction parameters based on the offset.

[0040] Preferably, the calculation of alignment correction parameters based on the offset includes:

[0041] S11. Calculate the actual offset D based on the initial offset D0 of the LED array and optical components;

[0042] S12. Calculate the alignment correction parameter C = J × D based on the offset D and the preset sensitivity coefficient J;

[0043] S13. Based on the alignment correction parameter C, adjust the X-axis position offset ΔX = C × cosθ and the Y-axis position offset ΔY = C × sinθ of the LED array, where θ is the deflection angle of the LED array relative to the optical component.

[0044] S14. If the offset D is greater than the predetermined threshold D th Then re-execute S11 to S13 until offset D ≤ D th .

[0045] As can be seen from the above technical solution, the present invention has the following beneficial effects:

[0046] This long-distance visible light voice transmission system based on an LED array corrects alignment deviations between the LED array and optical components using a correction module. A modulation module generates a modulation signal corresponding to the voice signal, and a light-emitting module applies the modulation signal to the LED array, causing it to emit visible light of the corresponding frequency. A focusing module efficiently focuses the visible light through the optical components, forming a long-distance transmission beam. A demodulation module demodulates the received light signal, restoring it to the original voice signal. This effectively reduces alignment errors between the LED array and optical components, significantly improving the performance of the optical system. The system exhibits more uniform light distribution and clearer focusing, avoiding the defects of light deviation or energy loss inherent in traditional mechanical fixing methods. It can promptly correct alignment deviations, ensuring the stability of the system's optical performance during long-term operation. It achieves a balance between alignment accuracy and economy, reducing the cost of large-scale production and maintenance, shortening system debugging time, and improving production efficiency. It is suitable for diverse application environments and solves the problem of poor light focusing caused by the difficulty of precise alignment between the LED array and optical components in existing technologies. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the system module connections of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figure 1 As shown, the present invention provides a technical solution: a long-distance visible light voice transmission system based on an LED array, the system comprising:

[0050] The calibration module is used to correct alignment deviations of the LED array and optical components;

[0051] The modulation module is used to generate a modulation signal corresponding to the speech signal;

[0052] The light-emitting module, connected to the modulation module and the correction module, is used to apply the modulation signal to the LED array so that it emits visible light of the corresponding frequency;

[0053] The focusing module, connected to the light-emitting module, is used to efficiently focus visible light through optical components to form a long-distance transmission beam. Specifically, it optimizes the focusing performance of the optical components based on a perspective scaling model, using the following formula:

[0054] Where h′ represents the size of the beam or target image after focusing by the optical components, f represents the focal length of the lens, d represents the object distance, and h represents the size of the light-emitting area of ​​the light source;

[0055] Based on the relative position of the light source and the target receiver, the focal length and position of the lens are adjusted in real time to verify the shape and energy density distribution of the focused beam.

[0056] The demodulation module, connected to the focusing module, demodulates the received optical signal and restores it to the original audio signal. Specifically, it analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies it. The specific formula is: P(t) = P0e -λt ;

[0057] Where P(t) represents the intensity of signal propagation, P0 represents the initial intensity of the signal, λ represents the signal attenuation coefficient, and t represents time;

[0058] Analyze the modulation frequency distribution of the signal and restore it to the original speech signal by combining the modulation rules.

[0059] This system leverages the high-frequency modulation characteristics of LED arrays to convert speech signals into corresponding modulated signals. The optical signal is modulated through the combined action of a correction module and a modulation module. Under the influence of the modulated signal, the LED array at the transmitting end produces frequency-controllable visible light output. Utilizing the focusing capability of the optical components, the emitted beam achieves long-distance, efficient transmission guided by a perspective scaling model. A real-time focusing mechanism optimizes the beam shape, improving transmission stability and energy density distribution. At the receiving end, the optical signal is demodulated to recover the original speech signal. An attenuation model corrects for signal loss during transmission, thus achieving efficient and reliable signal restoration. By employing a correction module and focusing mechanism, the system ensures precise alignment between the LED array and optical components, improving beam quality and energy concentration, thereby enhancing transmission efficiency and distance. The use of high-frequency modulated LED array technology avoids the complex driving and high costs required by traditional lasers, reducing the overall system cost. The modular design facilitates adjustment of focal length and optical component parameters, adapting to different usage scenarios and target distances. Signal correction based on an attenuation model restores accurate voice signals, ensuring reliable transmission and low distortion. The system can adapt to various environments, including optical signal transmission under low visibility conditions, further expanding its application scenarios.

[0060] The calibration module corrects alignment misalignments in the LED array and optical components, including:

[0061] The initial deviation between the LED array and the optical components is collected, and the optimal adjustment path and required torque of the optical components in multi-dimensional space are calculated. The specific formula is: τ = J T ·F;

[0062] Where τ represents the adjustment torque of the correction module, i.e., the adjustment intensity required during the correction process; J represents the Jacobian matrix, which represents the geometric relationship and adjustment path between the LED array and the optical components; and F represents the correction force required to be applied for the initial deviation measured by the sensor during the alignment of the optical components. T This represents the transpose of J.

[0063] The correction module in this embodiment collects initial deviation data between the LED array and the optical components, and, in conjunction with the geometric constraints of the optical system, establishes a multi-dimensional adjustment path model using the Jacobian matrix. The adjustment torque is given by the formula τ = J T F is calculated, and the specific steps are as follows:

[0064] High-precision sensors are used to collect the alignment status of the LED array and optical components, including positional and angular deviations;

[0065] Based on the geometric characteristics of the optical system, a Jacobian matrix J is constructed to characterize the spatial relationship between the LED array and the optical components.

[0066] The measured deviation value is used as input, combined with the transpose J of the Jacobian matrix. T Calculate the adjustment torque τ that needs to be applied;

[0067] Based on the calculation results, the optical components are precisely aligned by applying an adjustment force through the actuator.

[0068] By calculating the adjustment path using the Jacobian matrix in multidimensional space, the initial deviation between the LED array and the optical components can be accurately corrected, significantly improving the alignment accuracy of the system. Based on the real-time acquired deviation information and the calculated adjustment torque, the system can respond quickly and realize the automated alignment process, reducing manual intervention. The optimal alignment state after the optical components are corrected can significantly improve the beam transmission efficiency and energy density, thereby improving the performance of the entire system. The construction of the Jacobian matrix enables the system to adapt to different deviation forms, including changes in position and angle, and has strong adaptability and stability.

[0069] The modulation module generates a modulation signal corresponding to the speech signal, including:

[0070] The frequency range of the speech signal is mapped to the equivalent frequency range of molecular vibrations. The speech signal is encoded into an equivalent vibrational frequency modulation signal. This modulation signal is applied to the driving circuit of the LED array to control the LED array to emit corresponding modulated visible light. The vibrational frequency is adjusted according to the real-time changes in the speech signal. The specific formula for adjusting the vibrational frequency is as follows:

[0071] Where ω represents the frequency of the modulated signal generated from the speech signal, k represents the rigidity of the frequency change in the modulated signal, and μ represents the inertia parameter.

[0072] The modulation module in this embodiment achieves the modulation and transmission of voice signals through the following steps: Based on the frequency characteristics of the voice signal, it is converted into an equivalent vibration frequency range that the LED array can respond to, in order to achieve efficient frequency modulation. Modulation techniques (such as amplitude modulation or frequency modulation) are used to encode the voice signal into a corresponding vibration frequency signal, and this signal is updated in real time to adapt to the dynamic changes in the voice signal. The generated modulation signal is input into the driving circuit of the LED array. By controlling the frequency and intensity of the driving current, the LED array emits visible light of the corresponding frequency. Changes in the voice signal are monitored in real time, and the signal is transmitted according to the formula... The frequency of the modulation signal is dynamically adjusted, where the rigidity parameter k and the inertia parameter μ are determined by the signal characteristics and the system response time, respectively, to ensure rapid adjustment of the modulation frequency and stable output.

[0073] By using equivalent mapping and dynamic adjustment of vibration frequency, precise matching between the voice signal and the LED array's emission frequency is achieved, ensuring the accuracy and stability of signal modulation. The modulation frequency is adjusted in real time according to the dynamic changes of the voice signal, effectively reducing signal distortion and improving transmission quality. The modulated signal is directly applied to the LED array through an optimized driving circuit, simplifying the modulation and transmission process, reducing power consumption, and improving system efficiency. The vibration frequency model used can be adjusted according to different voice signal characteristics to adapt to the needs of different voice frequency ranges and application scenarios.

[0074] The light-emitting module applies a modulation signal to the LED array, causing it to emit visible light of a corresponding frequency, including:

[0075] Based on ambient light conditions and signal strength feedback from the receiver, the luminous intensity and direction of the LED array are dynamically adjusted to optimize its thermal management performance. The specific formula is as follows:

[0076] Where I represents the luminous intensity of the LED array at a distance r, I0 represents the maximum luminous intensity of the LED array when it emits or the initial intensity of the beam, γ represents the rate of light intensity decay with distance r, and r represents the propagation distance of the light from the LED array to the target receiver.

[0077] This implementation achieves dynamic light emission control and thermal management of the LED array through the following steps: The receiving end monitors the signal strength in real time and sends the intensity data to the light-emitting module through a feedback loop. The system dynamically adjusts the light emission intensity of the LED array based on the feedback information to meet the signal transmission requirements while optimizing energy utilization using a formula. The luminous intensity is adjusted based on the propagation distance r and the attenuation rate γ. At shorter distances, the initial intensity I0 is reduced to avoid excessive energy consumption; at longer distances, the intensity is increased to compensate for light attenuation and ensure effective signal transmission. By incorporating an adjustable mechanism in the optical components, the direction of the LED beam is adjusted according to the actual position of the receiver to improve the utilization efficiency and transmission effect of light energy. The operating temperature of the LED array is monitored in real time, and the heat distribution is adjusted through a heat dissipation device (such as an aluminum heat sink or an active air cooling system) to prevent overheating during high-intensity operation.

[0078] The LED array's luminous intensity is dynamically adjusted based on signal strength feedback to avoid unnecessary energy waste and improve overall system efficiency. By adjusting the luminous direction and intensity in real time, stable signal transmission at different distances is ensured, reducing the bit error rate caused by signal attenuation. A thermal management mechanism is adopted to effectively control the LED array's operating temperature, preventing performance degradation or equipment damage caused by overheating. The luminous parameters (intensity, direction) of the LED array can be flexibly adjusted according to actual usage scenarios to adapt to complex transmission environments, such as scenarios with multiple obstacles or long-distance transmission requirements. By optimizing thermal management and energy control, the energy consumption and maintenance costs of the LED array are reduced, improving the equipment's economic efficiency.

[0079] The calibration module also includes obtaining the actual positional deviation of the LED array and optical components to correct the alignment deviation of the LED array and optical components: comparing the actual positional deviation with a preset deviation range; if the actual positional deviation exceeds the preset deviation range, adjusting the position of the LED array or optical components to reduce the deviation; and after calibration, re-detecting the alignment deviation of the LED array and optical components to ensure that it is within the preset deviation range.

[0080] This implementation ensures high precision during system operation by detecting and correcting alignment deviations between the LED array and optical components. The specific process includes using a calibration module to acquire the actual positions of the LED array and optical components, measuring their deviation values, comparing the measured positional deviations with a preset safety deviation range to determine if adjustment is necessary. If the deviation exceeds the preset range, an actuator moves the LED array or optical component to realign them. After adjustment, the system re-detects the deviation value to ensure it remains within the safety range, thus guaranteeing transmission accuracy and stability. Through multiple detections and adjustments, the alignment of the LED array and optical components is ensured, improving system performance. No manual intervention is required; the system can automatically complete position adjustments through a feedback mechanism, making operation more efficient. The corrected alignment reduces signal distortion and improves the reliability of signal transmission.

[0081] Obtaining the actual positional deviation between the LED array and the optical components involves: determining the actual relative position between the LED array and the optical components using a laser measuring instrument; capturing images of the relative positions of the LED array and the optical components using an image sensor; and calculating the actual positional deviation Δd between the LED array and the optical components based on the captured image data, where Δd = |d| 实测 -d 理论 |,d 实测 Indicates the measured position, d 理论 Indicates the design location.

[0082] By combining laser measurement and image sensing technologies, the actual relative positional deviation between the LED array and the optical components is accurately measured. A high-precision laser measuring instrument is used to determine the actual relative distance between the LED array and the optical components. An image sensor captures images of their relative positions to obtain visual information about the positional deviation. Based on the image data and laser ranging data, the actual deviation value Δd is calculated and compared with the design value to guide subsequent correction operations. The combination of laser measurement and image processing technologies ensures high accuracy in deviation detection. Furthermore, the use of visual and distance data improves the comprehensiveness and reliability of deviation detection. The calculation process requires no manual intervention, reducing human error and increasing efficiency.

[0083] Calculating the actual positional deviation Δd between the LED array and optical components based on captured image data includes edge detection of the image data to identify the edge positions of the LED array and optical components; calculating the coordinates of their center points, denoted as P1 and P2, based on the edge positions; and calculating the actual positional deviation using the formula... Where (x1, y1) are the coordinates of P1, and (x2, y2) are the coordinates of P2.

[0084] Accurate positional deviation is obtained through image edge detection and center point calculation: The image is preprocessed (e.g., grayscale conversion, noise reduction), and the edge contours of the LED array and optical components are extracted using an edge detection algorithm. Based on the edge contours, the geometric center point coordinates of the LED array and optical components are calculated. Based on the center point coordinates, the actual positional deviation Δd between the two is calculated, providing a basis for subsequent correction. The use of geometric center point calculation significantly improves the accuracy of deviation measurement. Edge detection technology can adapt to different image qualities and has a wide range of applications. Based on image processing technology, high-precision position detection can be completed without complex equipment.

[0085] After calculating the actual position deviation, Δd is compared with the preset threshold δ, where δ = k × σ, k is a constant, and σ is the standard deviation of the actual position deviation. If Δd > δ, the position is adjusted and re-detected until Δd ≤ δ.

[0086] This implementation achieves precise alignment correction by comparing positional deviation and a dynamic threshold δ. Based on multiple measurements of actual positional deviation data, its standard deviation σ is calculated to dynamically reflect the statistical characteristics of the deviation. The dynamic threshold δ is calculated using the formula δ = k × σ, where the constant k can be adjusted according to actual needs (such as correction accuracy requirements). The measured deviation Δd is compared with the threshold δ to determine if adjustment is needed. If Δd > δ, the position of the LED array or optical component is adjusted by controlling an actuator (such as a micro motor or piezoelectric actuator), and the deviation value is re-detected until Δd ≤ δ. This standard deviation-based threshold calculation method can adapt to different environmental conditions, improving correction accuracy and flexibility. Through multiple adjustment and detection cycles, the alignment state of the LED array and optical components is ensured to meet accuracy requirements, limiting the deviation value within the dynamic threshold δ and significantly reducing the impact of deviation on signal transmission.

[0087] S1 also includes acquiring the relative offsets of the LED array and optical components at different positions, and calculating alignment correction parameters based on these offsets. The correction module generates alignment correction parameters by detecting the relative offsets of the LED array and optical components at different positions, thereby guiding position adjustment: offset data of the LED array and optical components are acquired at multiple positions to obtain initial values ​​of the relative offsets; based on the acquired offset data, alignment correction parameters are generated using system design parameters to guide the correction operation; and based on the alignment correction parameters, the position of the LED array or optical components is adjusted until the offset meets the design requirements. Through comprehensive calculation of offsets at multiple positions, high-precision correction of the alignment state is achieved. The dynamic updating of the alignment correction parameters enables the system to quickly respond to changes in the environment or system state, reducing offset while improving the concentration of beam transmission and enhancing system reliability.

[0088] The alignment correction parameters are calculated based on the offset, including: S11, calculating the actual offset D based on the initial offset D0 of the LED array and optical components; S12, calculating the alignment correction parameter C = J × D based on the offset D and the preset sensitivity coefficient J; S13, adjusting the X-axis position offset ΔX = C × cosθ and the Y-axis position offset ΔY = C × sinθ of the LED array based on the alignment correction parameter C, where θ is the deflection angle of the LED array relative to the optical components; S14, if the offset D is greater than a predetermined threshold D... th Then re-execute S11 to S13 until offset D ≤ D th .

[0089] The relative positional deviation of the LED array and optical components is corrected through a series of calculations and adjustments: the initial offset D0 is measured and compared with the actual offset D to determine the correction requirement; based on the offset D and the sensitivity coefficient J, the correction parameter C is calculated to determine the correction force and direction; the specific offsets on the X and Y axes are calculated using parameter C, and the position adjustment is completed based on the deflection angle θ; if the offset exceeds the preset threshold D... th The calibration process is repeated to ensure that the alignment meets the requirements. By combining X-axis and Y-axis adjustments, multi-dimensional precision calibration of the LED array and optical components is achieved. Calibration parameters are calculated and positions are adjusted in real time, enabling rapid adaptation to complex deviations. The accuracy of position calibration directly improves the stability and efficiency of optical signal transmission.

[0090] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A long-range visible light voice transmission system based on an LED array, characterized in that, The system includes: The calibration module is used to correct alignment deviations of the LED array and optical components; The modulation module is used to generate a modulation signal corresponding to the speech signal; The light-emitting module, connected to the modulation module and the correction module, is used to apply the modulation signal to the LED array so that it emits visible light of the corresponding frequency; The focusing module, connected to the light-emitting module, is used to efficiently focus visible light through optical components to form a long-distance transmission beam. Specifically, it optimizes the focusing performance of the optical components based on a perspective scaling model, using the following formula: ; in, This indicates the size of the beam of light or the image of the target after it has been focused by the optical components. Indicates the focal length of the lens. Indicates object distance, Indicates the size of the light-emitting area of ​​the light source; Based on the relative position of the light source and the target receiver, the focal length and position of the lens are adjusted in real time to verify the shape and energy density distribution of the focused beam. The demodulation module, connected to the focusing module, demodulates the received optical signal and restores it to the original audio signal. Specifically, it analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies it using the following formula: ; in, Indicates the intensity of signal propagation. Indicates the initial strength of the signal. Indicates the signal attenuation coefficient. Indicates time; Analyze the modulation frequency distribution of the signal and restore it to the original speech signal by combining the modulation rules; The correction module for correcting alignment deviations of the LED array and optical components also includes: Obtain the actual positional deviation of the LED array and optical components: Compare the actual position deviation with the preset deviation range; If the actual position deviation exceeds the preset deviation range, adjust the position of the LED array or optical components to reduce the deviation; After calibration, the alignment deviation of the LED array and optical components is checked again to ensure that it is within the preset deviation range; The acquisition of the actual positional deviation of the LED array and optical components includes: The actual relative positions between the LED array and optical components are determined using a laser measuring instrument. The relative position images of the LED array and optical components are captured by an image sensor; The actual positional deviation Δd between the LED array and the optical components is calculated based on the captured image data, where Δd = |d| 实测 -d 理论 |,d 实测 Indicates the measured position, d 理论 Indicates the design location; The calculation of the actual positional deviation Δd between the LED array and the optical components based on the captured image data includes: Edge detection is performed on the image data to identify the edge positions of the LED array and optical components; The coordinates of the center points of the two points are calculated based on their edge positions and denoted as P1 and P2, respectively. The actual position deviation is calculated using the formula Δd= , Where (x1, y1) are the coordinates of P1, and (x2, y2) are the coordinates of P2; The modulation module generates a modulation signal corresponding to the speech signal, including: The frequency range of the speech signal is mapped to the equivalent frequency range of molecular vibrations. The speech signal is encoded into an equivalent vibrational frequency modulation signal. This modulation signal is applied to the driving circuit of the LED array to control the LED array to emit corresponding modulated visible light. The vibrational frequency is adjusted according to the real-time changes in the speech signal. The specific formula for adjusting the vibrational frequency is as follows: ; in, This indicates the frequency of the modulation signal generated based on the speech signal. Indicates the rigidity of frequency changes in the modulated signal. This represents the inertial parameter.

2. The long-distance visible light voice transmission system based on an LED array according to claim 1, characterized in that: The correction module corrects alignment deviations of the LED array and optical components, including: The actual positional deviation between the LED array and the optical components is collected, and the optimal adjustment path and required torque of the optical components in multi-dimensional space are calculated. The specific formula is as follows: ; in, This indicates the adjustment torque of the calibration module, i.e., the adjustment intensity that needs to be applied during the calibration process. The Jacobian matrix represents the geometric relationship and adjustment path between the LED array and the optical components. This indicates the corrective force required to correct the initial deviation measured by the sensor during the alignment of the optical components. express The transpose of .

3. A long-distance visible light voice transmission system based on an LED array according to claim 1, characterized in that: The light-emitting module applies a modulation signal to the LED array to make it emit visible light of a corresponding frequency, including: Based on ambient light conditions and signal strength feedback from the receiver, the luminous intensity and direction of the LED array are dynamically adjusted to optimize its thermal management performance. The specific formula is as follows: ; in, Indicates the distance of the LED array The luminous intensity at that location This indicates the maximum luminous intensity or the initial intensity of the light beam when the LED array emits light. Indicates light intensity as a function of distance The decay rate, This indicates the distance light travels from the LED array to the target receiver.

4. A long-distance visible light voice transmission system based on an LED array according to claim 1, characterized in that: After calculating the actual position deviation, Δd is compared with a preset threshold δ, where δ = k × σ, k is a constant, and σ is the standard deviation of the actual position deviation. If Δd > δ, the position is adjusted and re-detected until Δd ≤ δ.

5. A long-distance visible light voice transmission system based on an LED array according to claim 1, characterized in that: The correction module also includes acquiring the relative offset of the LED array and optical components at different positions, and calculating alignment correction parameters based on the offset.

6. A long-distance visible light voice transmission system based on an LED array according to claim 5, characterized in that: The calculation of alignment correction parameters based on the offset includes: S11. Calculate the actual offset D based on the initial offset D0 of the LED array and optical components; S12. Calculate the alignment correction parameter C = J × D based on the offset D and the preset sensitivity coefficient J; S13. Based on the alignment correction parameter C, adjust the X-axis position offset ΔX=C×cosθ and the Y-axis position offset ΔY=C×sinθ of the LED array, where θ is the deflection angle of the LED array relative to the optical component. S14. If the offset D is greater than the predetermined threshold D th Then re-execute S11 to S13 until offset D ≤ D th .

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