A directional sound-emitting device and its manufacturing process

Abstract

This invention belongs to the field of sound-generating device technology, specifically a directional sound-generating device and its manufacturing process. It includes a folding mechanism, a height adjustment mechanism located below the folding mechanism, a rotating mechanism located at the top of the folding mechanism, an angle adjustment mechanism located at the top of the rotating mechanism, and a mounting mechanism located above the angle adjustment mechanism. A directional sound-generating body is fixed above the angle adjustment mechanism via the mounting mechanism. The rotating mechanism includes a fixed base, with a second motor fixedly connected to the left side of the top of the fixed base. A first gear is fixedly connected to the output end of the second motor, and a second gear is meshed with the right side of the first gear. This invention achieves lateral adjustment of the sound-generating device by controlling the rotation of the first gear with the second motor, which in turn drives the second gear to rotate the rotating frame. Vertical adjustment of the sound-generating device is achieved by controlling the up-and-down movement of the mounting frame with a telescopic rod. This solves the problem of traditional sound-generating devices requiring manual adjustment to change the direction of the sound source output, which is labor-intensive.

Description

Technical Field

[0001] This invention belongs to the field of sound-generating device technology, specifically a directional sound-generating device and its manufacturing process. Background Technology

[0002] During building construction, it is necessary to conduct hollow area detection. Hollow area detection is not an overreaction, but rather a scientific method to eliminate potential problems in advance; it is essentially a form of "preventive maintenance." It balances safety, economy, and aesthetics, and is of great significance to owners, construction companies, and the long-term value of the building. Ignoring hollow areas may not cause immediate problems, but the accumulated risks over the long term often result in repair costs far exceeding the cost of detection. In the construction and maintenance of buildings, hollow area detection is a crucial step in preventative maintenance. Traditional detection methods rely on manual visual inspection or single imaging devices, which are inefficient, unreliable, and pose high safety risks. Currently, detection solutions using remote directional sound sources combined with laser acoustic vibration scanners are gradually being adopted. The core of this approach is to input acoustic vibration excitation signals to the target area through a directional sound source, and then use laser scanning to collect the vibration response to identify hollow areas.

[0003] However, existing directional sound generation technology has many shortcomings in practical applications: (1) Traditional directional sound sources mostly use ordinary sound waves to propagate, which have poor directivity and sound energy is easy to diffuse. When propagating over long distances, the clarity and intensity are insufficient, making it difficult to meet the needs of high-precision directional excitation over long distances of more than 1,000 meters in building exterior wall inspection. (2) The direction adjustment of the existing sound-generating device relies on manual operation, which is labor-intensive. The device is fixed to the base with bolts, making it inconvenient to transport and store. In addition, some directional sound-generating technologies do not fully combine the high directivity characteristics of ultrasound, making it difficult to form a stable sound intensity excitation of about 80dB in the hollow drum detection. Furthermore, the uniform sound field area is insufficient, affecting the detection coverage effect. At the same time, environmental noise can easily interfere with the acquisition of vibration signals, leading to misjudgment in detection. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies and solve the problems of traditional sound-generating devices, a directional sound-generating device and its manufacturing process are proposed.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A directional sound-emitting device includes a folding mechanism, a height adjustment mechanism located below the folding mechanism, a rotation mechanism located at the top of the folding mechanism, an angle adjustment mechanism located at the top of the rotation mechanism, and a mounting mechanism located above the angle adjustment mechanism. A Doppler laser device is fixed above the angle adjustment mechanism via the mounting mechanism. The rotating mechanism includes a fixed base, a second motor is fixedly connected to the left side of the top of the fixed base, a first gear is fixedly connected to the output end of the second motor, a second gear is meshed with the right side of the first gear, a fixed shaft is fixedly connected inside the second gear, and the second motor drives the second gear through the first gear to drive the fixed shaft and the angle adjustment mechanism to rotate laterally. The angle adjustment mechanism includes a rotating frame, a telescopic rod, and a mounting frame. The rotating frame is fixedly connected to a fixed shaft, and a connecting block is movably connected to the top of the rotating frame. The telescopic rod drives the mounting frame to rotate around the connecting block, thereby realizing the vertical angle adjustment of the Doppler laser device.

[0006] Preferably, a mounting bracket is fixedly connected to the top of the connecting block, the rear of the bottom of the mounting bracket is movably pinned to the output end of the telescopic rod, and the base of the telescopic rod is movably pinned to the rotating frame.

[0007] Preferably, the folding mechanism includes a support frame, a first motor, a support screw, a screw slide, a movable ring, a folding rod, and a connecting rod. The first motor drives the support screw to move the movable ring up and down, thereby realizing the folding and unfolding of the folding rod. A first motor is fixedly connected to the inner bottom of the support frame. A support screw is fixedly connected to the output end of the first motor. A screw slide is threaded onto the outside of the support screw. A movable ring is fixedly connected to the outside of the screw slide. Folding rods are movably pinned to the four sides of the movable ring. A connecting rod is provided between each folding rod and the support frame. The connecting rod is movably pinned to both the folding rod and the support frame.

[0008] Preferably, the folding rod is provided in a group, which is respectively connected to the front, back, left and right sides of the movable ring. The two ends of the connecting rod are respectively connected to the folding rod and the support frame by movable pins to realize the stable opening and closing of the folding rod.

[0009] Preferably, the height adjustment mechanism includes a movable column, a guide slider, a guide groove, a fixed insert rod, and a support foot. The movable column slides along the guide groove of the folding rod via the guide slider, and the height is fixed by the fixed insert rod. Each of the movable columns is movably connected to a folding rod. Each folding rod has a guide groove on its outer wall. Guide sliders that match the guide grooves are fixedly connected to the upper sides of both sides of the movable column. Several fixing holes are provided on both sides of the outer wall of the folding rod. A fixing rod that matches the fixing hole is provided inside the bottom fixing hole. Each movable column has a support foot that is movably pinned to its bottom. The support foot is movably pinned to the movable column and can be rotated and stored. The bottom of the support foot is provided with an anti-slip rubber pad.

[0010] Preferably, the mounting mechanism includes a mounting screw, a fixing block, and a mounting block. The mounting screw pushes the fixing block into the fixing groove of the mounting block to achieve rapid fixing of the Doppler laser device. The two mounting screws are respectively threaded to the front and rear sides of the mounting frame. A fixing block is movably connected to the opposite side of the two mounting screws. A sound-generating device is provided inside the mounting frame. The bottom of the sound-generating device is fixedly connected to the mounting block. Fixing grooves that are adapted to the fixing block are opened on the front and rear sides of the outer wall of the mounting block.

[0011] Preferably, it further includes a directional sound-generating body, which includes a speaker array, a signal processing module, and an ultrasonic carrier module; the ultrasonic carrier module is used to generate an ultrasonic carrier of 20kHz-1GHz, carrying audible sound waves on the ultrasonic carrier; the signal processing module is based on beamforming technology and controls the phase and amplitude of each unit of the speaker array through a phased array algorithm; the speaker array is used to output a directional sound beam, achieving sound wave self-demodulation through air nonlinearity, forming a highly directional sound beam in the target area.

[0012] Preferably, the loudspeaker array is a uniformly distributed multi-unit array structure, with the unit spacing adapted to the ultrasonic carrier wavelength, and the array aperture is 10-50cm.

[0013] A manufacturing process for a directional sound-generating device includes the following steps: Step S1: Folding mechanism fabrication: The support frame, folding rod, and connecting rod are made of high-strength aluminum alloy. The surface of the connecting rod is anodized to enhance its corrosion resistance. The first motor is fixed to the bottom of the support frame. The support screw is connected to the output end of the first motor. The screw slide is threaded to the outside of the support screw. The movable ring is fixed to the outside of the screw slide. The folding rod is connected to the movable ring by a movable pin. The connecting rod is hinged to the folding rod and the support frame respectively to ensure that the folding rod opens and closes smoothly when the movable ring is raised and lowered. Step S2: Assemble the height adjustment mechanism: The movable column is made of stainless steel. Guide sliders are fixed on the upper sides of the movable column. Guide grooves and multiple sets of fixing holes are opened on the outer wall of the folding rod. The fixing holes are spaced in cm. The movable column is connected to the folding rod through the guide slider and guide groove. The fixing rod is inserted into the fixing hole. The support foot is hinged to the bottom of the movable column and the bottom is glued with anti-slip rubber pad. Step S3: Fabrication of the rotation mechanism and angle adjustment mechanism: The fixed base is made of cast iron. The second motor is fixed on the top of the fixed base. The first gear is connected to the output end of the second motor. The second gear meshes with the first gear. The fixed shaft passes through the second gear and is fixed to the rotating frame. The connecting block is movably connected to the top of the rotating frame. The mounting frame is fixed to the connecting block. The two ends of the telescopic rod are respectively hinged to the mounting frame and the rotating frame to ensure that the mounting frame rotates smoothly when the telescopic rod extends and retracts. Step S4: Assemble the directional sound-emitting body: The speaker array, signal processing module, and ultrasonic carrier module are integrated and fixed. The speaker array uses neodymium iron boron magnet speaker units, which are fixed in the housing in a uniform array, and the unit spacing is adapted to the ultrasonic carrier wavelength. The ultrasonic carrier module uses a high-frequency signal generator. The signal processing module integrates a Fourier transform unit, a phase amplitude control unit, and a noise suppression unit. The speaker array, signal processing module, and ultrasonic carrier module are electrically connected by wires. Step S5, Overall Assembly: Fix the fixed seat of the rotating mechanism to the top of the support frame of the folding mechanism. The mounting screw is threaded to the front and rear sides of the mounting frame. The fixing block is movably connected to the opposite side of the mounting screw. Place the mounting block of the Doppler laser device in the mounting frame. Rotate the mounting screw to insert the fixing block into the fixing groove to complete the assembly.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a directional sound-generating device and its manufacturing process, which has the following beneficial effects: This invention controls the rotation of the first gear by the second motor, which drives the second gear to rotate the angle adjustment mechanism laterally. Combined with the telescopic rod driving the mounting frame to rotate vertically, it realizes the automatic horizontal and vertical adjustment of the sound source output direction without manual operation. This solves the problem of time-consuming and laborious manual adjustment of traditional sound-generating devices, and is especially suitable for high-altitude inspection scenarios such as building exterior walls.

[0015] This invention controls the rotation of the support screw via a first motor, which drives the movable ring to rise and fall, thereby realizing the folding and unfolding of the folding rod. With the movable column sliding along the guide groove and the fixed insertion rod positioning, the height of the device can be flexibly adjusted and quickly stored. This solves the problems of inconvenient handling and difficulty in adapting the height to different testing scenarios of traditional devices. The anti-slip rubber pads of the support feet and the rotating storage design further improve the stability and portability of the device.

[0016] This invention utilizes an installation screw to push a fixing block into the fixing groove of the installation block, thereby achieving rapid fixing and disassembly of the directional sound-emitting body and the Doppler laser device. Compared with the traditional bolt fixing method, it significantly shortens the assembly and disassembly time and facilitates equipment maintenance and transportation.

[0017] This invention combines ultrasonic carrier wave and beamforming technology to generate a highly directional sound beam, enabling precise transmission of sound energy over long distances (over 1000 meters) with a stable sound intensity of around 80 dB, meeting the acoustic excitation requirements for detecting hollow areas in building exterior walls. The noise suppression unit of the signal processing module effectively reduces environmental interference and minimizes false positives. Combined with the high-precision vibration measurement function of the Doppler laser device (measurement sensitivity on the order of 10 picometers), it improves the accuracy of hollow area detection.

[0018] This invention allows for flexible setting of measurement point intervals based on the sound field area, enabling segmented scanning. Combined with the automatic scanning function of the Doppler laser device, it significantly shortens the detection time. For example, in the detection of walls larger than 10 square meters, the scanning time can be controlled within 300 seconds, and the number of measurement points is sufficient to ensure comprehensive detection coverage. It is suitable for detecting hollow areas on exterior walls made of different materials such as mortar + paint and ceramic tiles. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the support frame of the present invention; Figure 3 This is a three-dimensional structural diagram of the installation mechanism of the present invention; Figure 4 This is a connection diagram of the Doppler laser device of the present invention; Figure 5 This is a partial structural schematic diagram of the height adjustment mechanism of the present invention; Figure 6 This is a schematic diagram of the external wall hollow scanning process of the present invention; Figure 7 This is a schematic diagram of wall detection according to Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of wall detection according to Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of wall detection in Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of wall detection in Embodiment 4 of the present invention; Figure 11 This is a schematic diagram of wall detection in Embodiment 5 of the present invention; Figure 12 This is a schematic diagram of wall detection according to Embodiment 6 of the present invention; Figure 13 This is a schematic diagram of wall detection according to Embodiment 7 of the present invention; Figure 14This is a schematic diagram of wall detection in Embodiment 8 of the present invention.

[0020] In the picture: 1. Folding mechanism; 101. Support frame; 102. First motor; 103. Support screw; 104. Screw slide; 105. Movable ring; 106. Folding rod; 107. Connecting rod; 2. Height adjustment mechanism; 201. Movable column; 202. Guide slider; 203. Guide groove; 204. Fixed rod; 205. Support foot; 3. Rotating mechanism; 301. Fixed base; 302. Second motor; 303. First gear; 304. Second gear; 4. Angle adjustment mechanism; 401. Rotating frame; 402. Connecting block; 403. Telescopic rod; 404. Mounting bracket; 5. Installation mechanism; 501. Mounting screw; 502. Fixing block; 503. Sound-generating device; 504. Mounting block; 6. Directional sound generator; 601. Speaker array; 602. Signal processing module; 603. Ultrasonic carrier module; 7. Doppler laser device. Detailed Implementation

[0021] 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.

[0022] Specific implementation examples are given below.

[0023] Please see Figures 1-14 The present invention provides a directional sound-emitting device, including a folding mechanism 1 and a directional sound-emitting body 6, a height adjustment mechanism 2 located below the folding mechanism 1, a rotation mechanism 3 located at the top of the folding mechanism 1, an angle adjustment mechanism 4 located at the top of the rotation mechanism 3, and a mounting mechanism 5 located above the angle adjustment mechanism 4. A Doppler laser device 7 is fixed above the angle adjustment mechanism 4 via the mounting mechanism 5.

[0024] like Figures 1-3As shown, the rotating mechanism 3 includes a fixed base 301. A second motor 302 is fixedly connected to the left side of the top of the fixed base 301. A first gear 303 is fixedly connected to the output end of the second motor 302. A second gear 304 is meshed with the right side of the first gear 303. A fixed shaft is fixedly connected inside the second gear 304. The second motor 302 drives the second gear 304 through the first gear 303 to drive the fixed shaft and the angle adjustment mechanism 4 to rotate laterally. The angle adjustment mechanism 4 includes a rotating frame 401, a telescopic rod 403, and a mounting frame 404. The rotating frame 401 is fixedly connected to the fixed shaft. A connecting block 402 is movably connected to the top of the rotating frame 401. A mounting frame 404 is fixedly connected to the top of the connecting block 402. The rear of the bottom of the mounting frame 404 is movably pinned to the output end of the telescopic rod 403. The base of the telescopic rod 403 is movably pinned to the rotating frame 401. The telescopic rod 403 drives the mounting frame 404 to rotate around the connecting block 402, thereby realizing the vertical angle adjustment of the Doppler laser device 7.

[0025] Through the above scheme: the second motor 302 starts, driving the first gear 303 to rotate. Under the meshing action of the gear, the second gear 304 is pushed to drive the rotating frame 401 to rotate, completing the horizontal adjustment of the sound-generating device 503. The telescopic rod 403 starts, pulling the mounting frame 404 to move up and down. Since the top of the rotating frame 401 is movably connected to the connecting block 402, the vertical adjustment of the sound-generating device 503 is completed.

[0026] like Figure 1 and Figure 2As shown, the folding mechanism 1 includes a support frame 101, a first motor 102, a support screw 103, a screw slide 104, a movable ring 105, a folding rod 106, and a connecting rod 107. The first motor 102 drives the support screw 103 to move the movable ring 105 up and down, thereby realizing the folding and unfolding of the folding rod 106. The first motor 102 is fixedly connected to the inner bottom of the support frame 101, and the support screw 103 is fixedly connected to the output end of the first motor 102. The outer side of the support screw 103... A lead screw slide 104 is threadedly connected to the main body of the screw slide 104. A movable ring 105 is fixedly connected to the outside of the lead screw slide 104. Folding rods 106 are movably pinned to the four sides of the movable ring 105. Each folding rod 106 is connected to the support frame 101 by a connecting rod 107. The connecting rods 107 are movably pinned to the folding rods 106 and the support frame 101, respectively. There are four sets of folding rods 106, which are respectively connected to the four sides of the movable ring 105. The two ends of the connecting rods 107 are respectively connected to the support frame 101. The folding rod 106 and the support frame 101 are connected by a movable pin to achieve stable opening and closing of the folding rod 106. The height adjustment mechanism 2 includes a movable column 201, a guide slider 202, a guide groove 203, a fixed insert rod 204, and a support foot 205. The movable column 201 slides along the guide groove 203 of the folding rod 106 via the guide slider 202, and the height is fixed by the fixed insert rod 204. Each movable column 201 is movably connected to the folding rod 106, and each folding rod 106 has a guide on its outer wall. Guide sliders 202, which are compatible with guide slides 203, are fixedly connected to the upper sides of both sides of the slide groove 203 and the movable column 201. Several fixing holes are opened on both sides of the outer wall of the folding rod 106. The fixing rod 204 that is compatible with it is set inside the bottom fixing hole. Each movable column 201 has a support foot 205 movably pinned to its bottom. The support foot 205 is movably pinned to the movable column 201 and can be rotated and stored. The bottom of the support foot 205 is provided with an anti-slip rubber pad.

[0027] Through the above scheme: the first motor 102 starts, driving the support screw 103 to rotate. Under the action of the thread, the screw slide 104 is pushed to drive the movable ring 105 to move vertically. Since the connecting rod 107 is connected to the folding rod 106 and the support frame 101 respectively, the folding rod 106 is connected to the four sides of the movable ring 105. The folding rod 106 is closed and opened, the movable column 201 is pulled down and adjusted to a suitable height, and the fixed insertion rod 204 is inserted into the fixed insertion hole to complete the height adjustment of the sound-generating device 503.

[0028] like Figure 1 and Figure 3As shown, the mounting mechanism 5 includes a mounting screw 501, a fixing block 502, and a mounting block 504. The mounting screw 501 pushes the fixing block 502 into the fixing groove of the mounting block 504 to achieve rapid fixing of the Doppler laser device 7. The two mounting screws 501 are respectively threaded to the front and rear sides of the mounting frame 404. The fixing block 502 is movably connected to the opposite side of the two mounting screws 501. A sound-emitting device 503 is provided inside the mounting frame 404. The bottom of the sound-emitting device 503 is fixedly connected to the mounting block 504. Fixing grooves that are adapted to the fixing block 502 are opened on the front and rear sides of the outer wall of the mounting block 504.

[0029] The above method involves placing the sound-generating device 503 in the mounting bracket 404, rotating the mounting screw 501, and using the thread to push the fixing block 502 into the fixing groove, thus completing the installation and fixing of the sound-generating device 503.

[0030] The directional sound-generating body 6 employs directional sound generation. The directional sound-generating body 6 includes a speaker array 601, a signal processing module 602, and an ultrasonic carrier module 603. The ultrasonic carrier module 603 is used to generate an ultrasonic carrier of 20kHz-1GHz, carrying audible sound waves on the ultrasonic carrier. The signal processing module 602 is based on beamforming technology and controls the phase and amplitude of each unit of the speaker array 601 through a phased array algorithm. The speaker array 601 is used to output a directional sound beam, achieving sound wave self-demodulation through air nonlinearity, forming a highly directional sound beam in the target area. The speaker array 601 is a uniformly distributed multi-unit array structure, with the unit spacing adapted to the ultrasonic carrier wavelength, and the array aperture is 10-50cm.

[0031] A manufacturing process for a directional sound-generating device includes the following steps: Step S1: Folding mechanism fabrication: The support frame 101, folding rod 106, and connecting rod 107 are made of high-strength aluminum alloy. The surface of the connecting rod 107 is anodized to enhance corrosion resistance. The first motor 102 is fixed to the bottom of the support frame 101. The support screw 103 is connected to the output end of the first motor 102. The screw slide 104 is threaded to the outside of the support screw 103. The movable ring 105 is fixed to the outside of the screw slide 104. The folding rod 106 is movably pinned to the movable ring 105. The connecting rod 107 is hinged to both the folding rod 106 and the support frame 101 to ensure that the folding rod 106 opens and closes smoothly when the movable ring 105 is raised or lowered. Step S2: Assemble the height adjustment mechanism: The movable column 201 is made of stainless steel. Guide sliders 202 are fixed on both sides of the movable column 201. The outer wall of the folding rod 106 has guide grooves 203 and multiple sets of fixing holes with a spacing of 5cm between the fixing holes. The movable column 201 is connected to the folding rod 106 through the guide sliders 202 and guide grooves 203. The fixing rod 204 is inserted into the fixing holes. The support foot 205 is hinged to the bottom of the movable column 201 and the bottom is glued with an anti-slip rubber pad. Step S3: Fabrication of the rotation mechanism and angle adjustment mechanism: The fixed base 301 is made of cast iron. The second motor 302 is fixed on the top of the fixed base 301. The first gear 303 is connected to the output end of the second motor 302. The second gear 304 meshes with the first gear 303. The fixed shaft passes through the second gear 304 and is fixed to the rotating frame 401. The connecting block 402 is movably connected to the top of the rotating frame 401. The mounting frame 404 is fixed to the connecting block 402. The two ends of the telescopic rod 403 are respectively hinged to the mounting frame 404 and the rotating frame 401 to ensure that the mounting frame 404 rotates smoothly when the telescopic rod 403 extends and retracts. Step S4: Assemble the directional sound-emitting body: The speaker array 601, signal processing module 602, and ultrasonic carrier module 603 are integrated and fixed. They are electrically connected via wires. The speaker array 601 uses neodymium iron boron magnet speaker units, arranged in a uniform array and fixed to the housing. The unit spacing is adapted to the ultrasonic carrier wavelength. The ultrasonic carrier module 603 uses a high-frequency signal generator to generate an ultrasonic carrier wave of 20kHz-1GHz. Audible sound waves are mounted on the carrier wave through amplitude modulation using a double-sideband amplitude modulation formula.

[0032] in, The modulated carrier signal, The amplitude of the ultrasonic carrier wave. This is the amplitude modulation factor. It is an audible sound wave modulated signal. This is the ultrasonic carrier frequency. It is a time variable; The signal processing module 602 integrates a Fourier transform unit, a phase and amplitude control unit, and a noise suppression unit; The speaker array 601 uses neodymium iron boron magnet speaker units, arranged in a uniform array with a unit spacing of [missing information]. With ultrasonic carrier wavelength adaptation, With a sound speed of 343 m / s and an array aperture of 10-50 cm, the signal processing module 602 controls the phase of each unit through a phased array algorithm to achieve directional beamforming. The phase delay formula is as follows:

[0033]

[0034] in, For the first Phase delay time of each speaker unit, The spacing between adjacent units. The target beam pointing angle is -90° to 90°. For the first Phase offset of each unit; The signal processing module 602 integrates a Fourier transform unit, which converts time-domain signals into frequency-domain signals through discrete Fourier transform, facilitating phase / amplitude adjustment and noise separation. The Fourier transform formula is as follows:

[0035] in, For frequency domain signals, For time-domain input signals, The number of DFT transformation points ranges from 256 to 1024. The imaginary unit; Signal processing module 602 integrates a noise suppression unit, which uses the least mean square algorithm to suppress ambient noise. The weight update formula is as follows:

[0036] in, For the first The filter weight vector after the next iteration This is the current weight vector. The step size factor ranges from 0.001 to 0.01. For error signals, For the desired signal, The input signal vector; Step S5, Overall Assembly: The fixed seat 301 of the rotating mechanism 3 is fixed to the top of the support frame 101 of the folding mechanism 1. The mounting screw 501 is threaded to the front and rear sides of the mounting frame 404. The fixing block 502 is movably connected to the opposite side of the mounting screw 501. The mounting block 504 of the Doppler laser device 7 is placed in the mounting frame 404. The mounting screw 501 is rotated to insert the fixing block 502 into the fixing groove, thus completing the assembly.

[0037] like Figure 7-14 As shown, a method of using a directional sound-emitting device includes the following steps: On-site setup: Transport the device to the testing site, unfold the folding rod 106 through the folding mechanism 1, adjust the movable column 201 of the height adjustment mechanism 2 to a suitable height, insert the fixing rod 204 for positioning, and unfold the support feet 205 to ensure device stability; according to the position of the wall to be tested, adjust the horizontal angle through the second motor 302 of the rotating mechanism 3, and adjust the vertical angle of the mounting bracket 404 through the telescopic rod 403, so that the sound beam of the directional sound-emitting body 6 is pointed at the target wall, and the optical camera of the Doppler laser device 7 is aligned with the testing area.

[0038] Parameter settings: The sound excitation parameters are set through the signal processing module 602 of the directional sound generator 6, outputting a broadband audio frequency of 500~4000hz, and controlling the sound intensity of the target wall to 80dB; the scanning parameters are set through the Doppler laser device 7, including the measurement point interval (15×15cm or 20×20cm), the scanning range, and the function of automatically supplementing invalid data is enabled.

[0039] Detection procedure: The directional sound generator 6 is activated to emit a directional sound beam toward the target wall, causing the wall to vibrate under pressure; the Doppler laser device 7 is activated simultaneously to perform automatic scanning and collect vibration signals at each measuring point. The signal processing module 602 filters out environmental interference through the noise suppression unit and combines vibration spectrum and energy analysis to determine whether there is a void.

[0040] Data recording and verification: After the test is completed, the equipment automatically outputs a test report, including parameters such as the test area, number of test points, scanning time, and hollow rate; test points marked as hollow (orange to purplish-red) are manually inspected and confirmed.

[0041] like Figure 7-14 As shown, a real-world application case: exterior wall inspection of a maternal and child health hospital in City A, Province A (exterior wall material: mortar + paint). Example 1: The distance between the device and the wall is 4.97m, the interval between measuring points is 15×15cm, the detection area is 1.42m², the number of measuring points is 63, and the scanning time is 65s; the detection result is: the hollow rate is 30.2%, and the orange to purple-red measuring points in the figure are significant hollow points, which are confirmed to be correct by manual inspection.

[0042] Example 2: The distance between the device and the wall is 4.97m, the interval between measuring points is 15×15cm, the detection area is 1.42m², the number of measuring points is 63, and the scanning time is 90s; the detection result is: the hollow rate is 36.5%, and the orange to purple-red measuring points in the figure are significant hollow points, which are confirmed to be correct by manual inspection.

[0043] Example 3: The device was 5.2m away from the wall, the measuring point interval was 15×15cm, the detection area was 1.62m², the number of measuring points was 72, and the scanning time was 89s; the detection result was: the hollow rate was 41.7%, and the orange to purplish-red measuring points in the figure were significant hollow points, which were confirmed by manual inspection.

[0044] Exterior wall inspection of a residential community in City B, Province B (Exterior wall material: ceramic tiles) Example 4: The distance between the device and the wall was 16.26m, the interval between measuring points was 20×20cm, the detection area was 10.24m², the number of measuring points was 256, and the scanning time was 230s; the detection result was: the hollow rate was 0 and there were no abnormalities on the wall surface.

[0045] Example 5: The distance between the device and the wall was 16.26m, the interval between measuring points was 20×20cm, the detection area was 12.6m², the number of measuring points was 315, and the scanning time was 275s; the detection result was: the hollow rate was 0 and there were no abnormalities on the wall surface.

[0046] Example 6: The distance between the device and the wall was 16.26m, the interval between measuring points was 20×20cm, the detection area was 13.56m², the number of measuring points was 339, and the scanning time was 286s; the detection result was: the hollow rate was 0 and there were no abnormalities on the wall surface.

[0047] Example 7: The distance between the device and the wall was 16.26m, the interval between measuring points was 20×20cm, the detection area was 5.12m², the number of measuring points was 128, and the scanning time was 103s; the detection results were: the hollow rate was 0, and there were no abnormalities on the wall surface; the two measuring points marked in red were false detection points. The reason for the false detection was that the workers nearby used electric picks to break open the cement ground, which introduced a lot of noise interference. The false detection was eliminated after the noise suppression function was enabled.

[0048] Example 8: The distance between the device and the wall was 9.28m, the interval between measuring points was 20×20cm, the detection area was 7.6m², the number of measuring points was 190, and the scanning time was 176s; the detection result was: the hollow rate was 43.7%, and the orange to purple-red measuring points in the figure were significant hollow points. Some hollow points were confirmed to be correct by manual inspection.

[0049] Table 1 Summary of External Wall Hollow Area Detection Data

[0050] In the above case, due to the limited uniform sound field area of ​​the directional sound-emitting body 6, when scanning a large area of ​​the wall within the visible range of the device camera, the scanning is carried out by setting up a dot matrix in blocks to ensure that each area is subjected to stable sound excitation. Combined with the high-precision detection of the Doppler laser device 7, efficient hollow detection of exterior walls of different materials and at different distances is achieved, verifying the practicality and reliability of the device.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A directional sound-emitting device, characterized in that, It includes a folding mechanism (1), a height adjustment mechanism (2) located below the folding mechanism (1), a rotation mechanism (3) located at the top of the folding mechanism (1), an angle adjustment mechanism (4) located at the top of the rotation mechanism (3), and a mounting mechanism (5) located above the angle adjustment mechanism (4). A Doppler laser device (7) is fixed above the angle adjustment mechanism (4) via the mounting mechanism (5). The rotating mechanism (3) includes a fixed base (301), a second motor (302) is fixedly connected to the left side of the top of the fixed base (301), a first gear (303) is fixedly connected to the output end of the second motor (302), a second gear (304) is meshed with the right side of the first gear (303), a fixed shaft is fixedly connected inside the second gear (304), and the second motor (302) drives the second gear (304) through the first gear (303) to drive the fixed shaft and the angle adjustment mechanism (4) to rotate laterally; The angle adjustment mechanism (4) includes a rotating frame (401), a telescopic rod (403), and a mounting frame (404). The rotating frame (401) is fixedly connected to a fixed shaft. A connecting block (402) is movably connected to the top of the rotating frame (401). The telescopic rod (403) drives the mounting frame (404) to rotate around the connecting block (402) to realize the vertical angle adjustment of the Doppler laser device (7).

2. The directional sound-emitting device according to claim 1, characterized in that, The top of the connecting block (402) is fixedly connected to the mounting bracket (404), the rear of the bottom of the mounting bracket (404) is movably pinned to the output end of the telescopic rod (403), and the base of the telescopic rod (403) is movably pinned to the rotating frame (401).

3. The directional sound-emitting device according to claim 1, characterized in that, The folding mechanism (1) includes a support frame (101), a first motor (102), a support screw (103), a screw slide (104), a movable ring (105), a folding rod (106), and a connecting rod (107). The first motor (102) drives the support screw (103) to move the movable ring (105) up and down, thereby realizing the folding and unfolding of the folding rod (106). The inner bottom of the support frame (101) is fixedly connected to a first motor (102), and the output end of the first motor (102) is fixedly connected to a support screw (103). The external thread of the support screw (103) is connected to a screw slide (104), and the external thread of the screw slide (104) is fixedly connected to a movable ring (105). The four sides of the movable ring (105) are movably pinned to folding rods (106). Each folding rod (106) is connected to the support frame (101) by a connecting rod (107), and the connecting rod (107) is movably pinned to the folding rod (106) and the support frame (101) respectively.

4. A directional sound-emitting device according to claim 3, characterized in that, The folding rod (106) is provided in 4 sets, which are respectively connected to the front, back, left and right sides of the movable ring (105). The two ends of the connecting rod (107) are respectively connected to the folding rod (106) and the support frame (101) to realize the stable opening and closing of the folding rod (106).

5. A directional sound-emitting device according to claim 1, characterized in that, The height adjustment mechanism (2) includes a movable column (201), a guide slider (202), a guide groove (203), a fixed insert rod (204), and a support foot (205). The movable column (201) slides along the guide groove (203) of the folding rod (106) via the guide slider (202) and the height is fixed by the fixed insert rod (204). Each of the movable columns (201) is movably connected to the folding rod (106). Each of the folding rods (106) has a guide groove (203) on its outer wall. Guide sliders (202) that are compatible with the guide grooves (203) are fixedly connected to the upper sides of both sides of the movable column (201). Several fixing holes are provided on both sides of the outer wall of the folding rod (106). A fixing rod (204) that is compatible with the fixing hole at the bottom is provided inside the fixing hole at the bottom. Each of the movable columns (201) has a support foot (205) that is movably pinned to the bottom. The support foot (205) is movably pinned to the movable column (201) and can be rotated and stored. The bottom of the support foot (205) is provided with an anti-slip rubber pad.

6. A directional sound-emitting device according to claim 5, characterized in that, The mounting mechanism (5) includes a mounting screw (501), a fixing block (502) and a mounting block (504). The mounting screw (501) pushes the fixing block (502) into the fixing groove of the mounting block (504) to achieve rapid fixing of the Doppler laser device (7). Two mounting screws (501) are threaded to the front and rear sides of the mounting bracket (404) respectively. A fixing block (502) is movably connected to the opposite side of the two mounting screws (501). A sound-generating device (503) is provided inside the mounting bracket (404). The bottom of the sound-generating device (503) is fixedly connected to the mounting block (504). Fixing grooves that are compatible with the fixing block (502) are opened on the front and rear sides of the outer wall of the mounting block (504).

7. A directional sound-emitting device according to claim 1, characterized in that, It also includes a directional sound-generating body (6), which includes a loudspeaker array (601), a signal processing module (602), and an ultrasonic carrier module (603). The ultrasonic carrier module (603) is used to generate an ultrasonic carrier of 20kHz-1GHz, carrying audible sound waves on the ultrasonic carrier. The signal processing module (602) is based on beamforming technology and controls the phase and amplitude of each unit of the loudspeaker array (601) through a phased array algorithm. The loudspeaker array (601) is used to output a directional sound beam, and achieves sound wave self-demodulation through air nonlinearity to form a highly directional sound beam in the target area.

8. A directional sound-emitting device according to claim 7, characterized in that, The loudspeaker array (601) is a uniformly distributed multi-unit array structure with unit spacing adapted to the ultrasonic carrier wavelength and array aperture of 10-50cm.

9. The manufacturing process of a directional sound-generating device according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Folding mechanism fabrication: The support frame (101), folding rod (106), and connecting rod (107) are made of high-strength aluminum alloy. The surface of the connecting rod (107) is anodized to enhance corrosion resistance. The first motor (102) is fixed to the bottom of the support frame (101). The support screw (103) is connected to the output end of the first motor (102). The screw slide (104) is threaded to the outside of the support screw (103). The movable ring (105) is fixed to the outside of the screw slide (104). The folding rod (106) is movably pinned to the movable ring (105). The connecting rod (107) is hinged to the folding rod (106) and the support frame (101) respectively to ensure that the folding rod (106) opens and closes smoothly when the movable ring (105) rises and falls. Step S2: Assemble the height adjustment mechanism: The movable column (201) is made of stainless steel. Guide sliders (202) are fixed on both sides of the movable column (201). Guide grooves (203) and multiple sets of fixing holes are opened on the outer wall of the folding rod (106). The fixing holes are spaced 5cm apart. The movable column (201) is connected to the folding rod (106) through the guide sliders (202) and guide grooves (203). The fixing rod (204) is inserted into the fixing holes. The support foot (205) is hinged to the bottom of the movable column (201) and the bottom is glued with anti-slip rubber pads. Step S3: Fabrication of the rotation mechanism and angle adjustment mechanism: The fixed base (301) is made of cast iron. The second motor (302) is fixed on the top of the fixed base (301). The first gear (303) is connected to the output end of the second motor (302). The second gear (304) meshes with the first gear (303). The fixed shaft passes through the second gear (304) and is fixed to the rotating frame (401). The connecting block (402) is movably connected to the top of the rotating frame (401). The mounting frame (404) is fixed to the connecting block (402). The two ends of the telescopic rod (403) are hinged to the mounting frame (404) and the rotating frame (401) respectively to ensure that the mounting frame (404) rotates smoothly when the telescopic rod (403) extends and retracts. Step S4: Assemble the directional sound-emitting body: The loudspeaker array (601), signal processing module (602), and ultrasonic carrier module (603) are integrated and fixed. The loudspeaker array (601) uses neodymium iron boron magnet loudspeaker units, which are fixed in the housing in a uniform array arrangement, and the unit spacing is adapted to the ultrasonic carrier wavelength. The ultrasonic carrier module (603) uses a high-frequency signal generator. The signal processing module (602) integrates a Fourier transform unit, a phase amplitude control unit, and a noise suppression unit. The loudspeaker array (601), signal processing module (602), and ultrasonic carrier module (603) are electrically connected by wires. Step S5, Overall Assembly: Fix the fixed seat (301) of the rotating mechanism (3) to the top of the support frame (101) of the folding mechanism (1). The mounting screw (501) is threaded to the front and rear sides of the mounting frame (404). The fixing block (502) is movably connected to the opposite side of the mounting screw (501). Place the mounting block (504) of the Doppler laser device (7) inside the mounting frame (404). Rotate the mounting screw (501) to insert the fixing block (502) into the fixing groove to complete the assembly.

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