Long-distance voice visible light emission system based on LED array

Abstract

The invention discloses a long-distance voice visible light emission system based on an LED array, and relates to the technical field of optical illumination, and the system comprises a correction module which is used for correcting the alignment deviation of the LED array and an optical assembly, a modulation module which is used for generating a modulation signal corresponding to a voice signal, and a light emitting module which is used for applying the modulation signal to the LED array, the optical module is used for transmitting visible light with corresponding frequency, the focusing module is used for efficiently focusing the visible light through the optical module to form long-distance transmission light beams, and the demodulation module is used for demodulating received optical signals and restoring the optical signals into original voice signals; according to the long-distance voice visible light emission system based on the LED array, the maintenance cost of a product is reduced, the system debugging time is shortened, the production efficiency is improved, the system is suitable for diversified application environments, and the problem that in the prior art, due to the fact that accurate alignment between the LED array and an optical assembly is difficult, light focusing is poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of optical lighting, and in particular to a long-distance voice visible light emission system based on an LED array. Background Art

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

[0003] In the prior art, the installation of LED arrays and optical components usually adopts a mechanical fixing method. A major problem with this method is that it is difficult to achieve high-precision alignment. Due to the characteristics of the light output by the LED array, a slight offset or tilt may cause a significant decrease in the focusing effect of the light, which manifests as uneven light distribution, blurred light spot edges, or offset of the energy concentration area. This alignment error not only affects the efficiency of the optical system, but may also cause the optical performance of the system to be unstable; in addition, existing alignment schemes often require high-cost precision adjustment mechanisms or complex calibration processes, which further increases the manufacturing cost and debugging time of the product, limiting the application of this technology in large-scale production. Especially in scenarios with high optical performance requirements, such as automotive lighting, high-end display equipment, and medical imaging equipment, this alignment problem is more prominent. Summary of the invention

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

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

[0006] A correction module, used to correct the alignment deviation of the LED array and the optical component;

[0007] A modulation module, used to generate a modulation signal corresponding to the speech signal;

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

[0009] The focusing module connected to the light-emitting module is used to efficiently focus the visible light through the optical component to form a long-distance transmission beam. It is specifically based on the perspective zoom model to optimize the focusing performance of the optical component. The specific formula is:

[0010] Wherein, h′ represents the image size of the light beam or target after the optical component focuses, 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] According to the relative position of the light source and the target receiving end, the focal length and position of the lens are adjusted in real time to verify the beam shape and energy density distribution after focusing;

[0012] The demodulation module connected to the focusing module is used to demodulate the received optical signal and restore it to the original voice signal. It specifically analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies the optical signal. The specific formula is: P(t) = P0e -λt ;

[0013] Among them, 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 based on the modulation rules.

[0015] Preferably, the correction module corrects the alignment deviation between the LED array and the optical component, including:

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

[0017] Wherein, τ represents the adjustment torque of the correction module, that is, the adjustment strength that needs to be applied during the correction process, J represents the Jacobian matrix, which is the geometric relationship and adjustment path between the LED array and the optical component, F represents the correction force that needs to be applied to the initial deviation measured by the sensor during the alignment of the optical component, and J T represents the transpose of J.

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

[0019] The frequency range of the speech signal is mapped to the equivalent frequency range of molecular vibration, the speech signal is encoded into an equivalent vibration frequency modulation signal, the modulation signal is applied to the driving circuit of the LED array, the LED array is controlled to emit the corresponding modulated visible light, and the vibration frequency is adjusted according to the real-time changes of the speech signal. The specific formula for adjusting the vibration frequency is:

[0020] Among them, ω represents the frequency of the modulation signal generated according to the speech signal, k represents the rigidity of the frequency change in the modulation signal, and μ represents the inertia parameter.

[0021] Preferably, the light emitting module applies a modulation signal to the LED array so that it emits visible light of a corresponding frequency, including:

[0022] According to the ambient light conditions and the signal strength feedback from the receiving end, the luminous intensity and direction of the LED array are dynamically adjusted to optimize the thermal management performance of the LED array. The specific formula is:

[0023] Among them, I represents the luminous intensity of the LED array at a distance r, I0 represents the maximum luminous intensity of the LED array when emitting or the starting intensity of the light beam, γ represents the attenuation rate of the light intensity with distance r, and r represents the propagation distance of the light emitted from the LED array to the target receiving end.

[0024] Preferably, the correction module correcting the alignment deviation between the LED array and the optical component further comprises:

[0025] Get the actual position 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, the position of the LED array or the optical component is adjusted to reduce the deviation;

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

[0029] Preferably, obtaining the actual position deviation of the LED array and the optical component comprises:

[0030] Using a laser measuring instrument to determine the actual relative position between the LED array and the optical component;

[0031] capturing an image of the relative positions of the LED array and the optical assembly by an image sensor;

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

[0033] Preferably, the calculating the actual position deviation Δd between the LED array and the optical component based on the captured image data comprises:

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

[0035] Based on the edge positions, the coordinates of the center points of the two are calculated and recorded as P1 and P2 respectively;

[0036] The actual position deviation is calculated using the formula

[0037] Among them, (x1, y1) is the coordinate of P1, and (x2, y2) is the coordinate 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, S1 further includes obtaining the relative offset between the LED array and the optical component at different positions, and calculating the alignment correction parameter according to the offset.

[0040] Preferably, calculating the alignment correction parameter according to the offset includes:

[0041] S11, calculating an actual offset D based on an initial offset D0 of the LED array and the optical component;

[0042] S12, calculating the alignment correction parameter C=J×D according to the offset D and the preset sensitivity coefficient J;

[0043] S13, based on the alignment correction parameter C, adjusting 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 the offset D≤D th .

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

[0046] The long-distance voice visible light emission system based on LED array corrects the alignment deviation of LED array and optical component through correction module, the modulation module generates the modulation signal corresponding to the voice signal, the light emitting module applies the modulation signal to LED array to make it emit visible light of corresponding frequency, the focusing module efficiently focuses the visible light through the optical component to form a long-distance transmission light beam, the demodulation module demodulates the received light signal and restores it to the original voice signal, effectively reducing the alignment error between LED array and optical component, and significantly improving the performance of the optical system. Its light distribution is more uniform, the focusing effect is clearer, and the defects of light offset or energy loss under the traditional mechanical fixing method are avoided. The alignment deviation can be corrected in time to ensure the optical performance stability of the system in long-term operation, and the balance between alignment accuracy and economy is achieved, which reduces the large-scale production and maintenance costs of products, shortens the system debugging time, improves production efficiency, and is suitable for a variety of application environments. It solves the problem of poor light focusing caused by the difficulty of precise alignment between LED array and optical component in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the connection of the system modules of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 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 voice visible light emission system based on an LED array, the system comprising:

[0050] A correction module, used to correct the alignment deviation of the LED array and the optical component;

[0051] A modulation module, used to generate a modulation signal corresponding to the speech signal;

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

[0053] The focusing module connected to the light-emitting module is used to efficiently focus the visible light through the optical component to form a long-distance transmission beam. It is specifically based on the perspective zoom model to optimize the focusing performance of the optical component. The specific formula is:

[0054] Wherein, h′ represents the image size of the light beam or target after the optical component focuses, 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] According to the relative position of the light source and the target receiving end, the focal length and position of the lens are adjusted in real time to verify the beam shape and energy density distribution after focusing;

[0056] The demodulation module connected to the focusing module is used to demodulate the received optical signal and restore it to the original voice signal. It specifically analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies the optical signal. The specific formula is: P(t) = P0e -λt ;

[0057] Among them, 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 based on the modulation rules.

[0059] Based on the high-frequency modulation characteristics of the LED array, this system converts the voice signal into the corresponding modulation signal, and modulates the optical signal through the joint action of the correction module and the modulation module. The LED array at the transmitting end generates a frequency-controllable visible light output under the action of the modulation signal. Through the focusing ability of the optical component, the emitted light beam achieves long-distance and efficient transmission under the guidance of the perspective zoom model, and optimizes the beam shape through the real-time focusing mechanism to improve the stability of the transmission and the energy density distribution. At the receiving end, the optical signal is restored to the original voice signal through the demodulation module, and the signal loss during the transmission process is corrected in combination with the attenuation model, thereby achieving efficient and reliable signal restoration. Through the correction module and focusing mechanism, the LED array and optical components are accurately aligned, the beam quality and energy concentration are improved, thereby improving the transmission efficiency and distance. The high-frequency modulated LED array technology is used to avoid the complex drive and high cost required by traditional lasers, reducing the overall cost of the system. The modular design makes it easy to adjust the focal length and optical component parameters to adapt to different usage scenarios and target distances. The signal is corrected based on the attenuation model to restore the accurate voice signal, ensuring the reliability and low distortion rate of the transmission process. The system can adapt to a variety of environments, including optical signal transmission under low visibility conditions, further broadening the application scenarios.

[0060] The correction module corrects the alignment deviation of LED array and optical components including:

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

[0062] Wherein, τ represents the adjustment torque of the correction module, that is, the adjustment strength that needs to be applied during the correction process, J represents the Jacobian matrix, which is the geometric relationship and adjustment path between the LED array and the optical component, F represents the correction force that needs to be applied to the initial deviation measured by the sensor during the alignment of the optical component, and J T represents the transpose of J.

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

[0064] Use high-precision sensors to collect the alignment status of the LED array and the optical components, including position deviation and angle deviation;

[0065] According to the geometric characteristics of the optical system, the 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 of the Jacobian matrix J T , calculate the adjustment torque τ that needs to be applied;

[0067] Based on the calculation results, the adjustment force is applied by the actuator to achieve precise alignment of the optical components.

[0068] By calculating the adjustment path through the Jacobian matrix of multi-dimensional space, the initial deviation between the LED array and the optical component can be accurately corrected, significantly improving the system alignment accuracy. Based on the real-time collected deviation information and the calculated adjustment torque, the system can respond quickly to realize the automated alignment process and reduce manual intervention. The optimal alignment state after the optical component is corrected can significantly improve the transmission efficiency and energy density of the light beam, thereby improving the performance of the entire system. The construction of the Jacobian matrix enables the system to adapt to different forms of deviation, including position and angle changes, 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 vibration, the speech signal is encoded into an equivalent vibration frequency modulation signal, the modulation signal is applied to the driving circuit of the LED array, the LED array is controlled to emit the corresponding modulated visible light, and the vibration frequency is adjusted according to the real-time changes of the speech signal. The specific formula for adjusting the vibration frequency is:

[0071] Among them, ω represents the frequency of the modulation signal generated according to the speech signal, k represents the rigidity of the frequency change in the modulation signal, and μ represents the inertia parameter.

[0072] The modulation module of this embodiment realizes the modulation and emission of the voice signal through the following steps: according to the frequency characteristics of the voice signal, it is converted into an equivalent vibration frequency range that the LED array can respond to, so as to realize efficient frequency modulation, the voice signal is encoded into a corresponding vibration frequency signal by using modulation technology (such as amplitude modulation or frequency modulation), and it is updated in real time to adapt to the dynamic changes of the voice signal, the generated modulation signal is input into the driving circuit of the LED array, and the LED array emits visible light of the corresponding frequency by controlling the frequency and intensity of the driving current, and the changes of the voice signal are monitored in real time. 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] Through equivalent mapping and dynamic adjustment of vibration frequency, accurate matching of voice signal and LED array luminous frequency is achieved to ensure the accuracy and stability of signal modulation. According to the dynamic changes of voice signal, the modulation frequency is adjusted in real time to effectively reduce signal distortion and improve transmission quality. The modulated signal acts directly on the LED array through the optimized driving circuit, which simplifies the modulation and emission process, reduces power consumption and improves system efficiency. The vibration frequency model adopted can be adjusted according to different voice signal characteristics to meet 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 corresponding frequencies including:

[0075] According to the ambient light conditions and the signal strength feedback from the receiving end, the luminous intensity and direction of the LED array are dynamically adjusted to optimize the thermal management performance of the LED array. The specific formula is:

[0076] Among them, I represents the luminous intensity of the LED array at a distance r, I0 represents the maximum luminous intensity of the LED array when emitting or the starting intensity of the light beam, γ represents the attenuation rate of the light intensity with distance r, and r represents the propagation distance of the light emitted from the LED array to the target receiving end.

[0077] This implementation achieves dynamic luminescence 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 strength data to the light module through a feedback loop. The system dynamically adjusts the luminous intensity of the LED array based on the feedback information to meet the needs of signal transmission and optimize energy utilization. The formula is used The luminous intensity is adjusted based on the propagation distance r and the attenuation rate γ. At a closer distance, the initial intensity I0 is reduced to avoid excessive energy consumption; at a longer distance, the intensity is increased to compensate for light attenuation to ensure effective signal transmission. By adding an adjustable mechanism to the optical component, the direction of the LED beam is adjusted according to the actual position of the receiving end 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 work.

[0078] The luminous intensity of the LED array is dynamically adjusted based on signal strength feedback to avoid unnecessary energy waste and improve the overall efficiency of the system. The luminous direction and intensity are adjusted in real time to ensure that the signal can be transmitted stably at different distances and reduce the bit error rate caused by signal attenuation. The thermal management mechanism is adopted to effectively control the operating temperature of the LED array to avoid performance degradation or equipment damage caused by overheating. The luminous parameters (intensity, direction) of the LED array can be flexibly adjusted according to the actual usage scenario to adapt to complex transmission environments, such as multi-obstacle scenarios or long-distance transmission requirements. By optimizing thermal management and energy control, the energy consumption and maintenance costs of the LED array are reduced, and the economy of the equipment is improved.

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

[0080] This embodiment ensures the high-precision state of the system during operation by detecting and correcting the alignment deviation between the LED array and the optical component. The specific process includes using the correction module to collect the actual position of the LED array and the optical component, measuring its deviation value, comparing the measured position deviation with the preset safety deviation range, and judging whether adjustment is needed. If the deviation value exceeds the preset range, the LED array or the optical component is moved by the actuator to realign the two. After the adjustment is completed, the system detects the deviation value again to ensure that it is within the safe range, thereby ensuring the accuracy and stability of the transmission. Through multiple detections and adjustments, the alignment state of the LED array and the optical component is ensured, and the system performance is improved. Without manual intervention, the system can automatically complete the position adjustment through the feedback mechanism, and the operation is more efficient. The alignment state of the system after correction reduces signal distortion and improves the reliability of signal transmission.

[0081] Obtaining the actual position deviation between the LED array and the optical component includes measuring the actual relative position between the LED array and the optical component by using a laser measuring instrument; capturing the relative position image of the LED array and the optical component by using an image sensor; and calculating the actual position deviation Δd between the LED array and the optical component based on the captured image data, wherein Δd=|d 实测 -d 理论 |,d 实测 represents the measured position, d 理论 Indicates the design location.

[0082] By combining laser measurement and image sensing technology, the actual relative position deviation between the LED array and the optical component can be accurately measured: a high-precision laser measuring instrument is used to determine the actual relative distance between the LED array and the optical component, and an image sensor is used to capture an image of the relative position of the two to obtain visual information of the position deviation. The actual deviation value Δd is calculated based on the image data and laser ranging data, and compared with the design value to guide subsequent correction operations. The combination of laser measurement and image processing technology ensures high accuracy of deviation detection. At the same time, visual data and distance data are used to improve the comprehensiveness and reliability of deviation detection. The calculation process does not require human intervention, which reduces human errors and improves efficiency.

[0083] Calculating the actual position deviation Δd between the LED array and the optical component based on the captured image data includes edge detection of the image data to identify the edge positions of the LED array and the optical component; calculating the coordinates of the center points of the two based on the edge positions, which are recorded as P1 and P2 respectively; calculating the actual position deviation using the formula Among them, (x1, y1) is the coordinate of P1, and (x2, y2) is the coordinate of P2.

[0084] Accurately obtain position deviation through image edge detection and center point calculation: pre-process the image (such as grayscale, noise reduction), and extract the edge contour of the LED array and optical component through the edge detection algorithm. According to the edge contour, calculate the geometric center point coordinates of the LED array and the optical component. Based on the center point coordinates, calculate the actual position deviation Δd between the two, which provides a basis for subsequent correction. The geometric center point calculation is used to significantly improve the accuracy of deviation measurement. The 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 embodiment achieves accurate correction of alignment deviation by comparing position deviation and dynamic threshold δ: based on actual position deviation data measured multiple times, its standard deviation σ is calculated to dynamically reflect the statistical characteristics of the deviation, and the dynamic threshold δ is calculated by formula δ=k×σ, where constant k can be adjusted according to actual needs (such as correction accuracy requirements), and the measured deviation Δd is compared with the threshold δ to determine whether adjustment is required. If Δd>δ, the position of the LED array or optical component is adjusted by controlling the actuator (such as a micro motor or piezoelectric actuator), and the deviation value is re-detected until Δd≤δ is satisfied. The threshold calculation method based on standard deviation can adapt to different environmental conditions, improve correction accuracy and flexibility, and ensure that the alignment state of the LED array and optical component meets the accuracy requirements through multiple adjustment and detection cycles, limit the deviation value within the dynamic threshold δ, and significantly reduce the impact of the deviation on signal transmission.

[0087] S1 also includes obtaining the relative offset of the LED array and the optical component at different positions, and calculating the alignment correction parameters according to the offset. The correction module generates the alignment correction parameters by detecting the relative offset of the LED array and the optical component at different positions, thereby guiding the position adjustment: the offset data of the LED array and the optical component are collected at multiple positions to obtain the initial value of the relative offset, and the alignment correction parameters are generated based on the collected offset data and the system design parameters to guide the correction operation, and the position of the LED array or the optical component is adjusted based on the alignment correction parameters until the offset meets the design requirements. Through the comprehensive calculation of the multi-position offset, high-precision correction of the alignment state is achieved, and the dynamic update of the alignment correction parameters enables the system to quickly respond to changes in the environment or system state, reduce the offset, and improve the concentration of the beam transmission, thereby improving the reliability of the system.

[0088] Calculating the alignment correction parameters according to the offset includes: S11, calculating the actual offset D based on the initial offset D0 of the LED array and the optical component; S12, calculating the alignment correction parameter C=J×D according to 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 component; S14, if the offset D is greater than the predetermined threshold D th , then re-execute S11 to S13 until the offset D≤D th .

[0089] Through a series of calculation and adjustment steps, the relative position deviation of the LED array and the optical component is corrected: by measuring the offset D0 in the initial state and comparing it with the actual offset D, the correction requirement is determined. According to the offset D and the sensitivity coefficient J, the correction parameter C is calculated to determine the strength and direction of the correction. The specific offset of the X-axis and Y-axis is calculated using the parameter C, and the position adjustment is completed according to the deflection angle θ. If the offset exceeds the preset threshold D th , repeat the correction process to ensure that the alignment state meets the requirements. Combined with the adjustment operations of the X-axis and Y-axis, multi-dimensional precision correction of the LED array and optical components is achieved, and the correction parameters are calculated and the position is adjusted in real time. It can quickly adapt to complex deviations. The accuracy of position correction directly improves the stability and efficiency of optical signal transmission.

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

Claims

1. A long-distance voice visible light transmission system based on LED array, characterized in that: The system comprises: A correction module, used to correct the alignment deviation of the LED array and the optical component; A modulation module, used to generate a modulation signal corresponding to the speech signal; A light emitting module connected to the modulation module and the correction module, used to apply a modulation signal to the LED array so that it emits visible light of a corresponding frequency; The focusing module connected to the light-emitting module is used to efficiently focus the visible light through the optical component to form a long-distance transmission beam. It is specifically based on the perspective zoom model to optimize the focusing performance of the optical component. The specific formula is: Wherein, h′ represents the image size of the light beam or target after the optical component focuses, 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; According to the relative position of the light source and the target receiving end, the focal length and position of the lens are adjusted in real time to verify the beam shape and energy density distribution after focusing; The demodulation module connected to the focusing module is used to demodulate the received optical signal and restore it to the original voice signal. It specifically analyzes the attenuation path and distribution characteristics of the received optical signal and amplifies the optical signal. The specific formula is: P(t) = P0e -λt ; Among them, 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; Analyze the modulation frequency distribution of the signal and restore it to the original speech signal based on the modulation rules.

2. According to claim 1, a long-distance voice visible light transmission system based on LED array is characterized in that: The correction module corrects the alignment deviation between the LED array and the optical component, including: Collect the initial deviation between the LED array and the optical component, and calculate the optimal adjustment path and required torque of the optical component in multi-dimensional space. The specific formula is: τ = J T ·F; Wherein, τ represents the adjustment torque of the correction module, that is, the adjustment strength that needs to be applied during the correction process, J represents the Jacobian matrix, which is the geometric relationship and adjustment path between the LED array and the optical component, F represents the correction force that needs to be applied to the initial deviation measured by the sensor during the alignment of the optical component, and J T represents the transpose of J.

3. According to claim 1, a long-distance voice visible light transmission system based on LED array is characterized in that: The modulation module generates a modulation signal corresponding to the speech signal, comprising: The frequency range of the speech signal is mapped to the equivalent frequency range of molecular vibration, the speech signal is encoded into an equivalent vibration frequency modulation signal, the modulation signal is applied to the driving circuit of the LED array, the LED array is controlled to emit the corresponding modulated visible light, and the vibration frequency is adjusted according to the real-time changes of the speech signal. The specific formula for adjusting the vibration frequency is: Among them, ω represents the frequency of the modulation signal generated according to the speech signal, k represents the rigidity of the frequency change in the modulation signal, and μ represents the inertia parameter.

4. The long-distance voice visible light transmission system based on LED array according to claim 1, characterized in that: The light emitting module applies a modulation signal to the LED array so that it emits visible light of corresponding frequency, including: According to the ambient light conditions and the signal strength feedback from the receiving end, the luminous intensity and direction of the LED array are dynamically adjusted to optimize the thermal management performance of the LED array. The specific formula is: Among them, I represents the luminous intensity of the LED array at a distance r, I0 represents the maximum luminous intensity of the LED array when emitting or the starting intensity of the light beam, γ represents the attenuation rate of the light intensity with distance r, and r represents the propagation distance of the light emitted from the LED array to the target receiving end.

5. The long-distance voice visible light transmission system based on LED array according to claim 1, characterized in that: The correction module corrects the alignment deviation between the LED array and the optical component and further includes: Get the actual position 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, the position of the LED array or the optical component is adjusted to reduce the deviation; After calibration, the alignment deviation of the LED array and the optical assembly is checked again to ensure that it is within the preset deviation range.

6. The long-distance voice visible light transmission system based on LED array according to claim 5, characterized in that: The obtaining of the actual position deviation of the LED array and the optical component comprises: Using a laser measuring instrument to determine the actual relative position between the LED array and the optical component; capturing an image of the relative positions of the LED array and the optical assembly by an image sensor; The actual position deviation Δd between the LED array and the optical component is calculated based on the captured image data, where Δd=|d 实测 -d 理论 |,d 实测 represents the measured position, d 理论 Indicates the design location.

7. The long-distance voice visible light transmission system based on LED array according to claim 6, characterized in that: The calculating of the actual position deviation Δd between the LED array and the optical component based on the captured image data comprises: Perform edge detection on the image data to identify the edge positions of the LED array and the optical components; Based on the edge positions, the coordinates of the center points of the two are calculated and recorded as P1 and P2 respectively; The actual position deviation is calculated using the formula Among them, (x1, y1) is the coordinate of P1, and (x2, y2) is the coordinate of P2.

8. The long-distance voice visible light transmission system based on LED array according to claim 7, 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.

9. The long-distance voice visible light transmission system based on LED array according to claim 1, characterized in that: The S1 also includes obtaining the relative offset between the LED array and the optical component at different positions, and calculating the alignment correction parameter according to the offset.

10. The long-distance voice visible light transmission system based on LED array according to claim 9, characterized in that: Calculating the alignment correction parameter according to the offset comprises: S11, calculating an actual offset D based on an initial offset D0 of the LED array and the optical component; S12, calculating the alignment correction parameter C=J×D according to the offset D and the preset sensitivity coefficient J; S13, based on the alignment correction parameter C, adjusting 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 the offset D≤D th .

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