Method, apparatus, device and storage medium for sound source positioning

Abstract

This disclosure provides a method, apparatus, device, storage medium, and program product for sound source localization, belonging to the field of sound source localization technology. In this method, the structure of the sound source localization device is improved by using a multiplexer to combine laser beams emitted from multiple lasers. Subsequently, the laser beams emitted from the multiple lasers can be transmitted to different sound detection units using a single optical coupler and a smaller number of optical fibers, thus simplifying the structure of the sound source localization device.

Description

Technical Field

[0001] This disclosure relates to the field of sound source localization technology, and in particular to a method, apparatus, device, storage medium, and program product for sound source localization. Background Technology

[0002] With the development of sound source localization technology, microphone arrays are being applied in the field of sound source localization.

[0003] In related sound source localization technologies, distance measurement parameters between the sound source and the microphone, such as time difference of arrival, direction of arrival, and angle of arrival, are used to locate the sound source.

[0004] However, the structure of sound source localization equipment in related technologies is relatively complex, requiring the arrangement of a large number of optical couplers and a large number of optical fibers to transmit laser light. Summary of the Invention

[0005] To address the related technical problems, this disclosure provides a method, apparatus, device, storage medium, and program product for sound source localization. The technical solution is as follows:

[0006] In a first aspect, a sound source localization device is provided, the sound source localization device comprising multiple lasers, a wave combiner, a first optical coupler, multiple sound detection units, and a controller;

[0007] The plurality of lasers are electrically connected to the controller, and the plurality of lasers are optically connected to the multiplexer.

[0008] The multiplexer is optically connected to the first optical coupler;

[0009] The first optical coupler is optically connected to each sound detection unit;

[0010] Each sound detection unit is electrically connected to the controller.

[0011] In one possible implementation, the plurality of lasers are optically connected to the plurality of split ports of the multiplexer, and the multiplexing port of the multiplexer is optically connected to the first optical coupler.

[0012] In one possible implementation, the combining port of the first optical coupler is optically connected to the combining port of the multiplexer, and the splitting port of the first optical coupler is optically connected to each sound detection unit.

[0013] In one possible implementation, each of the sound detection units includes a second optical coupler, an optical fiber microphone, and a photodetector;

[0014] The first branch port of each second optical coupler is optically connected to one branch port of the first optical coupler;

[0015] The combining port of each second optical coupler is connected to the optical conduction of the corresponding fiber optic microphone;

[0016] The second branch port of each second optical coupler is optically connected to the corresponding photodetector.

[0017] Each photodetector is electrically connected to the controller.

[0018] In one possible implementation, the fiber optic microphone includes a frame, a flange, a ceramic ferrule, a soft washer, a diaphragm, a hard washer, and a pressure device.

[0019] The frame includes a connected base plate and side walls, the base plate having a first mounting hole, the side walls having an annular mounting groove, and the base plate and / or the side walls having vent holes.

[0020] The flange is connected to the frame, and the flange has a second mounting hole, which is opposite to the first mounting hole.

[0021] The ceramic ferrule is fixed in the first mounting hole and the second mounting hole, and the ceramic ferrule is used to fix the optical fiber.

[0022] The soft washer is fixed in the annular mounting groove;

[0023] The diaphragm is located at the end of the sidewall away from the base plate and is connected to the surface of the soft washer outside the annular mounting groove, and together with the base plate and the sidewall, they form a cavity;

[0024] The rigid washer is located on the side of the diaphragm away from the soft washer, opposite to the soft washer, and is connected to the diaphragm;

[0025] The pressure device is connected to the frame and is used to uniformly apply pressure toward the diaphragm to various positions on the surface of the rigid washer away from the diaphragm.

[0026] In a second aspect, a method for arranging an optical fiber microphone array is provided, the method being applied to the sound source localization device as described in the first aspect, the method comprising:

[0027] Based on preset maximum and minimum microphone spacing, the positions of multiple virtual microphones are determined on a spoke structure line in a plane. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of each line segment is located at the center of the circle.

[0028] Based on the preset sound source location, the preset noise source location, and the locations of the multiple virtual microphones, a simulated sound emission and sound collection process is performed to obtain the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location collected by the multiple virtual microphones.

[0029] The suppression ratio is determined based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location.

[0030] If the suppression ratio is less than or equal to the suppression ratio threshold, the positions of the plurality of virtual microphones are adjusted on the spoke structure line, and the process of simulating sound generation and sound collection is performed based on the preset sound source position, the preset noise source position and the positions of the plurality of virtual microphones.

[0031] If the suppression ratio is greater than the suppression ratio threshold, then the positions of multiple fiber optic microphones are set based on the positions of the multiple virtual microphones.

[0032] In one possible implementation, adjusting the positions of the plurality of virtual microphones along the spoke structure line includes:

[0033] The positions of the multiple virtual microphones are adjusted along the spoke structure line using a genetic algorithm; or...

[0034] The positions of the plurality of virtual microphones are randomly adjusted along the spoke structure line.

[0035] Thirdly, a method for sensitivity detection is provided, the method being applied to the sound source localization device as described in the first aspect, the method comprising:

[0036] When the sound source emits a sound of the target intensity, the controller acquires the light intensity output by each photodetector;

[0037] Based on the light intensity output by each photodetector and the sound intensity of the target, the controller determines the sensitivity of the sound source localization device.

[0038] In one possible implementation, multiple fiber optic microphones are distributed in the same plane and along a spoke structure line, which includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of each line segment is located at the center of the circle.

[0039] The sound source is located on a straight line passing through the center of the circle and perpendicular to the plane.

[0040] Fourthly, a fiber optic microphone array arrangement device is provided, the device being applied to the sound source localization device as described in the first aspect, the device comprising:

[0041] The determination module is used to determine the positions of multiple virtual microphones on a spoke structure line in a plane based on preset maximum and minimum microphone spacing. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of each line segment is located at the center of the circle.

[0042] The simulation module is used to simulate the sound generation and sound collection process based on the preset sound source location, the preset noise source location, and the locations of the multiple virtual microphones, to obtain the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location collected by the multiple virtual microphones.

[0043] The determining module is used to determine the suppression ratio based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location;

[0044] An adjustment module is used to adjust the position of the plurality of virtual microphones on the spoke structure line if the suppression ratio is less than or equal to the suppression ratio threshold, and switch to performing a simulated sound generation and sound collection process based on a preset sound source position, a preset noise source position and the position of the plurality of virtual microphones.

[0045] The setting module is used to set the positions of multiple fiber optic microphones based on the positions of the multiple virtual microphones if the suppression ratio is greater than the suppression ratio threshold.

[0046] Fifthly, a sensitivity detection device is provided, the device being applied to the sound source localization device as described in the first aspect, the device comprising:

[0047] The acquisition module is used to acquire the light intensity output by each photodetector when the sound source emits a sound of the target sound intensity.

[0048] A determination module is used to determine the sensitivity of the sound source localization device based on the light intensity output by each photodetector and the sound intensity of the target.

[0049] In a sixth aspect, a computer-readable storage medium is provided, which stores computer program code, such that when the computer program code is executed by a computer device, the computer device performs the methods provided by the second aspect, the third aspect, and their possible implementations.

[0050] In a seventh aspect, a computer program product is provided, the computer program product including computer program code, wherein when the computer program code is executed by a computer device, the computer device executes the methods provided by the second aspect, the third aspect, and their possible implementations.

[0051] This method improves the structure of the sound source localization device by using a multiplexer to combine the lasers emitted by multiple lasers. Then, the lasers emitted by multiple lasers can be transmitted to different sound detection units using a single optical coupler and fewer optical fibers, thus simplifying the structure of the sound source localization device. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of a related sound source localization device provided in an embodiment of this disclosure;

[0053] Figure 2 This is a schematic diagram of the structure of a sound source localization device provided in an embodiment of this disclosure;

[0054] Figure 3 This is a schematic diagram of the structure of a controller provided in an embodiment of this disclosure;

[0055] Figure 4 This is a schematic diagram of the structure of a sound source localization device provided in an embodiment of this disclosure;

[0056] Figure 5 This is a schematic diagram of the structure of a sound source localization device provided in an embodiment of this disclosure;

[0057] Figure 6 This is a schematic diagram of the structure of an optical fiber microphone provided in an embodiment of this disclosure;

[0058] Figure 7 This is a schematic diagram showing the distribution of an optical fiber microphone according to an embodiment of this disclosure;

[0059] Figure 8 This is a schematic diagram of the structure of a computer device provided in an embodiment of this disclosure;

[0060] Figure 9 This is a schematic diagram of the processing flow of a fiber optic microphone array arrangement method provided in an embodiment of this disclosure;

[0061] Figure 10 This is a schematic diagram of the structure of a computer device provided in an embodiment of this disclosure;

[0062] Figure 11 This is a schematic diagram of a sensitivity detection method processing flow provided in an embodiment of this disclosure;

[0063] Figure 12 This is a schematic diagram of an arrangement of an optical fiber microphone array provided in an embodiment of this disclosure;

[0064] Figure 13 This is a schematic diagram of a sensitivity detection device provided in an embodiment of this disclosure.

[0065] Figure label:

[0066] 1. Laser;

[0067] 2. Combiner; 2a. Splitting port; 2b. Combining port;

[0068] 3. First optical coupler; 3a. Combiner port; 3b. Splitting port;

[0069] 4. Sound detection unit; 41. Second optical coupler; 41a. First branch port of the second optical coupler; 41b. Combine port of the second optical coupler; 41c. Second branch port of the second optical coupler; 42. Fiber optic microphone; 43. Photodetector; 421. Frame; 422. Flange; 423. Ceramic ferrule; 424. Soft gasket; 425. Diaphragm; 426. Hard gasket; 427. Pressure device; 4211. Base plate of the frame; 4212. Side wall of the frame; 4211a. First mounting hole of the base plate; 4212a. Annular mounting groove of the side wall; 421a. Vent hole of the side wall; 422a. Second mounting hole of the flange;

[0070] 5. Controller. Detailed Implementation

[0071] Large pumps, compressors, and other equipment may emit acoustic and vibration signals when malfunctioning. Sound source localization equipment is typically used to locate the source of the sound and pinpoint the fault. In related technologies, sound source localization equipment can be used as follows: Figure 1 As shown, it may include multiple lasers 1, multiple first optical couplers 2, multiple sound detection units 3 and a controller 4, wherein the first optical couplers 2 transmit the laser emitted by the lasers 1 to the sound detection units 3.

[0072] This disclosure provides a sound source localization device, which can perform, as follows: Figure 2 As shown, it includes multiple lasers 1, a combiner 2, a first optical coupler 3, multiple sound detection units 4, and a controller 5. Generally, there are two lasers 1, and the two lasers 1 emit laser wavelengths that are different.

[0073] Multiple lasers 1 are electrically connected to controller 5, and multiple lasers 1 are optically connected to combiner 2.

[0074] The multiplexer 2 is optically connected to the first optical coupler 3. The multiplexer 2 can be a dense wavelength division multiplexer (DWDM). DWDM is an optical fiber data transmission technology that can multiplex optical signals of multiple wavelengths into a single optical fiber for transmission. The multiplexer 2 can transmit the lasers emitted by multiple lasers 1 to the first optical coupler 3 via a single optical fiber.

[0075] The first optocoupler 3 is optically connected to each sound detection unit 4. Each sound detection unit 4 is electrically connected to the controller 5.

[0076] The first optical coupler 3, also known as an opto-isolator or opto-coupler, or simply an optical coupler, can copy the optical signal transmitted by the multiplexer 2 multiple times and send it to multiple sound detection units 4. The number of copies is the same as the number of sound detection units 4.

[0077] Controller 5 can perform various calculations such as sensitivity calculation, receive and store the collected data, etc.

[0078] The structure of controller 5 can be as follows: Figure 3 As shown, it includes a processor 310, a memory 320, a display unit 330, and a communication unit 340.

[0079] The processor 310 can be a central processing unit (CPU) or a system on chip (SoC), etc. The processor 310 can be used to process various operation instructions, such as performing sensitivity calculations.

[0080] The memory 320 may include various volatile or non-volatile memories, such as solid-state disks (SSDs) and dynamic random access memory (DRAM). The memory 320 can be used to store initial data, intermediate data, and result data used in related processing, such as storing the received light intensity.

[0081] The display component 330 can be a standalone screen, or a screen integrated with the user device body, a projector, etc. The screen can be a touch screen or a non-touch screen (which can be displayed remotely), etc. The display component 330 is used to display system interfaces, application interfaces, etc., such as displaying the sensitivity of the microphone.

[0082] The communication component 340 can be a wired network connector, an ultra-wideband (UWB) technology module, a wireless fidelity (WiFi) module, a Bluetooth module, a cellular network communication module, etc. The communication component 340 can be used to receive and send various commands and data, such as acquiring the light intensity collected by a photodetector.

[0083] The port connections of the various components in the sound source localization device can be as follows: Figure 4As shown, multiple lasers 1 are optically connected to multiple branch ports 2a of the multiplexer 2, and the multiplexing port 2b of the multiplexer 2 is optically connected to the first optical coupler 3. The multiplexing port 3a of the first optical coupler 3 is optically connected to the multiplexing port 2b of the multiplexer 2, and the branch ports 3b of the first optical coupler 3 are optically connected to each sound detection unit 4.

[0084] Each sound detection unit 4 can be as follows: Figure 5 As shown, the system includes a second optical coupler 41, an optical fiber microphone 42, and a photodetector 43. The first branch port 41a of each second optical coupler 41 is optically connected to a branch port 3b of the first optical coupler 3. The combining port 41b of each second optical coupler 41 is optically connected to the corresponding optical fiber microphone 42. The second branch port 41c of each second optical coupler 41 is optically connected to the corresponding photodetector 43. Each photodetector 43 is electrically connected to the controller 5.

[0085] The fiber optic microphone 42 includes a frame 421, a flange 422, a ceramic ferrule 423, a soft washer 424, a diaphragm 425, a hard washer 426, and a pressure device 427, for example... Figure 6 As shown.

[0086] The frame 421 includes a connected base plate 4211 and a side wall 4212. The base plate 4211 has a first mounting hole 4211a, and the side wall 4212 has an annular mounting groove 4212a. The base plate 4211 and / or the side wall 4212 have vent holes 421a. The base plate 4211 is a cylinder, and the first mounting hole 4211a is a small hole inside the base plate 4211, which connects the bottom surface of the cylinder to the top surface of the cylinder.

[0087] Flange 422 is connected to frame 421. Flange 422 has a second mounting hole 422a, which is opposite to the first mounting hole 4211a. Ceramic ferrule 423 is fixed in the first mounting hole 4211a and the second mounting hole 422a. Ceramic ferrule 423 is used to fix optical fiber.

[0088] A soft washer 424 is fixed in an annular mounting groove 4212a. The soft washer 424 is annular and slightly smaller than the annular mounting groove 4212a. A diaphragm 425 is located at the end of the sidewall 4212 away from the base plate 4211, and is connected to the surface of the soft washer 424 outside the annular mounting groove 4212a, forming a cavity with the base plate 4211 and the sidewall 4212. A hard washer 426 is located on the side of the diaphragm 425 away from the soft washer 424, opposite to the soft washer 424, and is connected to the diaphragm 425. The hard washer 426 is also annular and the same size as the soft washer.

[0089] The pressure device 427 is connected to the frame 421 and is used to uniformly apply pressure toward the diaphragm 425 to various positions on the surface of the hard washer 426 away from the diaphragm 425.

[0090] The light emitted by laser 1 passes sequentially through combiner 2, first optical coupler 3, and second optical coupler 4, and is incident on the diaphragm 425 of fiber optic microphone 42. When fiber optic microphone 42 receives a sound signal, it causes diaphragm 425 to vibrate. The incident light is reflected by the vibration of diaphragm 425. Photodetector collects the intensity of the reflected light and determines the sound intensity based on the intensity of the reflected light. Thus, the sound source is located based on the sound intensity detected by fiber optic microphones 42 at different positions in the microphone array. The different sound intensities of the sound source cause different vibration amplitudes of the diaphragm, resulting in different intensities of the reflected light emitted by the diaphragm.

[0091] The distribution positions of multiple fiber optic microphones 42 can be as follows Figure 7 As shown, multiple fiber optic microphones 42 are distributed in the same plane and along the spoke structure line. The spoke structure line includes multiple concentric circles and multiple circumferentially distributed line segments passing through the center of the circles. The length of the line segments is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of the line segments is located at the center of the circle. Figure 7 Each small black circle represents a fiber optic microphone 42, and each circle lies on a spoke structure line. Their coordinates are represented by (γ, θ, k1, k2), where γ represents the distance between the fiber optic microphone 42 and the center point, θ represents the angle between the line connecting the center point and the fiber optic microphone 42 and the right horizontal axis, k1 represents the position of the fiber optic microphone 42 on the spoke line, and k2 represents the position of the fiber optic microphone 42 on the spoke line. The range of values ​​for k1 and k2 can be determined based on the number of fiber optic microphones 42. Figure 7 The possible values ​​of k1 are 0, 1, 2, 3, 4, 5, and the possible values ​​of k2 are 0, 1, 2, 3, 4, 5, 6, 7, 8. When the value of k1 or k2 is 0, it means that it is not on the wheel or spoke.

[0092] In this embodiment of the disclosure, the structure of the sound source localization device is improved by using a multiplexer to combine the lasers emitted by multiple lasers together. Then, the lasers emitted by multiple lasers can be transmitted to different sound detection units using a single optical coupler and fewer optical fibers, thus simplifying the structure of the sound source localization device.

[0093] The arrangement of the microphone array has a significant impact on the accuracy of sound source localization. This disclosure also provides a method for arranging a fiber optic microphone array. This method is applied to the aforementioned sound source localization device. The executing entity of this method can be the controller 5 or other computer equipment. The structure of the computer equipment can be as follows: Figure 8As shown, it includes a processor 810, a memory 820, a display unit 830, and a communication unit 840.

[0094] The processor 810 can be a CPU or a SoC, and it can be used to process various operation instructions, such as adjusting the position of multiple virtual microphones.

[0095] The memory 820 may include various volatile or non-volatile memories, such as SSDs and DRAM. The memory 820 can be used to store initial data, intermediate data, and result data used in the relevant processing, such as storing the suppression ratio obtained from each adjustment.

[0096] The display component 830 can be a standalone screen, or a screen integrated with the user equipment body, a projector, etc. The screen can be a touch screen or a non-touch screen (which can be displayed remotely), etc. The display component 830 is used to display system interfaces, application interfaces, etc., such as displaying the arrangement of fiber optic microphone arrays.

[0097] The communication component 840 can be a wired network connector, UWB, WiFi module, Bluetooth module, cellular network communication module, etc. The communication component 840 can be used to receive and send various commands and data, such as receiving preset maximum and minimum microphone spacing.

[0098] This embodiment uses controller 5 as the execution subject for illustration; other cases are similar and will not be described in detail. The processing flow of this method can be as follows: Figure 9 As shown, it includes the following steps:

[0099] 901. Based on the preset maximum and minimum microphone spacing, determine the positions of multiple virtual microphones on the spoke structure line in the plane.

[0100] The spoke structure includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of the line segment is located at the center of the circle.

[0101] Technicians can pre-measure the microphone dimensions, using the microphone diameter as the minimum microphone spacing and the diameter of the largest circle in the spoke structure as the maximum microphone spacing. The minimum and maximum microphone spacing are the distance between the center points of the two microphones.

[0102] 902. Based on the preset sound source location, preset noise source location, and the locations of multiple virtual microphones, a simulated sound generation and sound collection process is performed to obtain the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location collected by the multiple virtual microphones.

[0103] When setting up sound and noise sources, technicians can set the sound source to be larger than the noise source, so that the location with the highest energy corresponds to the location of the sound source.

[0104] 903. The suppression ratio is determined based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location.

[0105] Based on the beamforming algorithm, the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location can be determined, thereby determining the suppression ratio, which is the ratio of the sound energy corresponding to the sound source location to the sound energy corresponding to the noise source location.

[0106] 904. If the suppression ratio is less than or equal to the suppression ratio threshold, the positions of multiple virtual microphones on the spoke structure line are adjusted, and the process of simulating sound generation and sound collection is performed based on the preset sound source position, preset noise source position and the positions of multiple virtual microphones.

[0107] The positions of multiple virtual microphones can be adjusted along the spoke structure using a genetic algorithm, or randomly adjusted. The adjustment process involves moving all virtual microphones from their current positions, with the new positions determined iteratively by the genetic algorithm.

[0108] 905. If the suppression ratio is greater than the suppression ratio threshold, then set the positions of multiple fiber optic microphones 42 based on the positions of multiple virtual microphones.

[0109] Each time the positions of multiple virtual microphones are adjusted, the suppression ratio is calculated and compared with the suppression ratio before and after the adjustment. If the suppression ratio after the adjustment is greater than the suppression ratio before the adjustment, the current position adjustment is retained. If the suppression ratio after the adjustment is less than or equal to the suppression ratio before the adjustment, the current position adjustment is not retained. The adjustment of the positions of multiple virtual microphones is completed until the suppression ratio is greater than the suppression ratio threshold. Based on the positions of multiple virtual microphones, the positions of multiple fiber optic microphones 42 are set.

[0110] In addition, the size of the microphone can be reduced, which can improve the accuracy of locating high-frequency sound sources.

[0111] In this embodiment of the disclosure, the arrangement of the fiber optic microphone array is improved through simulation to determine the arrangement of the fiber optic microphone array that maximizes the suppression ratio. Such an arrangement of the fiber optic microphone array can more accurately locate the sound source and eliminate the interference of noise sources.

[0112] This disclosure also provides a sensitivity detection method, which is applied to the aforementioned sound source localization device. The execution subject of this method can be a controller 5 or other computer devices. The structure of the computer device can be as follows: Figure 10As shown, it includes a processor 1010, a memory 1020, a display unit 1030, and a communication unit 1040.

[0113] The processor 1010 can be a CPU or SoC, etc. The processor 1010 can be used to process various operation instructions, such as performing sensitivity calculations.

[0114] The memory 1020 may include various volatile or non-volatile memories, such as SSDs and DRAM. The memory 1020 can be used to store initial data, intermediate data, and result data used in related processing, such as storing the received light intensity.

[0115] The display component 1030 can be a standalone screen, or a screen integrated with the user equipment body, a projector, etc. The screen can be a touch screen or a non-touch screen (which can be displayed remotely), etc. The display component 1030 is used to display system interfaces, application interfaces, etc., such as displaying the arrangement of fiber optic microphone arrays.

[0116] The communication component 1040 can be a wired network connector, UWB, WiFi module, Bluetooth module, cellular network communication module, etc. The communication component 1040 can be used to receive and send various commands and data, such as acquiring the light intensity collected by a photodetector.

[0117] This embodiment uses controller 5 as the execution subject for illustration; other cases are similar and will not be described in detail. The processing flow of this method can be as follows: Figure 11 As shown, it includes the following steps:

[0118] 1101, when the sound source emits a sound of the target sound intensity, acquire the light intensity output by each photodetector 43.

[0119] Technicians can set up a standard sound source near the sound source localization device, and the photodetector 43 records the maximum and minimum values ​​of the light intensity.

[0120] Multiple fiber optic microphones 42 are distributed in the same plane along the spoke structure line. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the centers of the circles. The length of each line segment is the same as the diameter of the largest of the concentric circles, and the midpoint of each line segment is located at the center of the circle. Each fiber optic microphone 42 contains a reflective diaphragm. When sound waves are present, the vibration of the reflective diaphragm causes displacement, which affects the sensitivity of the fiber optic microphone 42. The sensitivity of the fiber optic microphone 42 can be determined by calculating the intensity and phase of the dual-wavelength orthogonal vectors of the two lasers 1.

[0121] 1102. Based on the light intensity and target sound intensity output by each photodetector 43, determine the sensitivity of the sound source localization device.

[0122] Controller 5 can normalize the maximum and minimum values ​​of the light intensity to obtain the normalized light intensity. Based on the normalized light intensity, the intensity and phase of the dual-wavelength orthogonal vector are determined. Controller 5 can pre-store the correspondence between the intensity and phase of the dual-wavelength orthogonal vector and the sensitivity of the fiber optic microphones. The sensitivity of each fiber optic microphone 42 is determined based on the intensity and phase of the dual-wavelength orthogonal vector.

[0123] The controller 5 can store the appropriate value of the fiber optic microphone 42, compare the sensitivity determined in the above steps with the appropriate sensitivity value, and if the sensitivity of the sound source localization device is not appropriate, the technician can adjust the sound source localization device and repeat the above steps to determine the sensitivity of the sound source localization device until the sensitivity reaches the appropriate value.

[0124] In this embodiment of the disclosure, when the intensity and phase of the wave are not affected by the reflection vibration, the fiber optic microphone has high sensitivity. The intensity and phase are determined by a photodetector, and then the sensitivity corresponding to the intensity and phase is determined. When the sensitivity is low, technicians can adjust the fiber optic microphone.

[0125] All of the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of this disclosure, and will not be described in detail here.

[0126] This disclosure also provides an arrangement device for an optical fiber microphone array, for example... Figure 12 As shown, the device includes:

[0127] The determining module 1210 is used to determine the positions of multiple virtual microphones on a spoke structure line in a plane based on preset maximum and minimum microphone spacing. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the centers of the circles. The length of each line segment is the same as the diameter of the largest circle among the concentric circles, and the midpoint of each line segment is located at the center of the circle. Specifically, this can implement the processing function of step 901 above, as well as other implicit steps.

[0128] The simulation module 1220 is used to simulate a sound emission and sound collection process based on preset sound source locations, preset noise source locations, and the locations of multiple virtual microphones, to obtain the sound energy corresponding to the sound source locations and the sound energy corresponding to the noise source locations collected by the multiple virtual microphones. Specifically, it can implement the processing function of step 902 above, as well as other implicit steps.

[0129] The determination module 1210 is used to determine the suppression ratio based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location. Specifically, it can implement the processing function of step 903 above, as well as other implicit steps.

[0130] The adjustment module 1230 is used to adjust the positions of multiple virtual microphones on the spoke structure line if the suppression ratio is less than or equal to the suppression ratio threshold, and then switch to performing a simulated sound generation and sound collection process based on preset sound source positions, preset noise source positions, and the positions of multiple virtual microphones. Specifically, it can implement the processing function of step 904 above, as well as other implicit steps.

[0131] The setting module 1240 is used to set the positions of multiple fiber optic microphones 42 based on the positions of multiple virtual microphones if the suppression ratio is greater than the suppression ratio threshold. Specifically, it can implement the processing function of step 905 above, as well as other implicit steps.

[0132] The aforementioned determining module 1210, simulation module 1220, adjustment module 1230, and setting module 1240 can be implemented by a processor, or by a processor in conjunction with a memory and a display.

[0133] In this embodiment of the disclosure, the arrangement of the fiber optic microphone array is improved through simulation to determine the arrangement of the fiber optic microphone array that maximizes the suppression ratio. Such an arrangement of the fiber optic microphone array can more accurately locate the sound source and eliminate the interference of noise sources.

[0134] This disclosure also provides a sensitivity detection device, for example... Figure 13 As shown, the device includes:

[0135] The acquisition module 1310 is used to acquire the light intensity output by each photodetector 43 when the sound source emits a sound of target intensity. Specifically, it can implement the processing function of step 1101 above, as well as other implicit steps.

[0136] The determination module 1320 is used to determine the sensitivity of the sound source localization device based on the light intensity and target sound intensity output by each photodetector 43. Specifically, it can implement the processing function of step 1102 above, as well as other implicit steps.

[0137] The aforementioned acquisition module 1310 and determination module 1320 can be implemented by a processor, or by a processor in conjunction with a memory and a display.

[0138] In this embodiment of the disclosure, when the intensity and phase of the wave are not affected by the reflection vibration, the fiber optic microphone has high sensitivity. The intensity and phase are determined by a photodetector, and then the sensitivity corresponding to the intensity and phase is determined. When the sensitivity is low, technicians can adjust the fiber optic microphone.

[0139] The fiber optic microphone array arrangement device and sensitivity detection device provided in the above embodiments are only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the electric device can be divided into different functional modules to complete all or part of the functions described above. In addition, the fiber optic microphone array arrangement device and the fiber optic microphone array arrangement method provided in the above embodiments belong to the same concept, and the sensitivity detection device and the sensitivity detection method provided in the above embodiments belong to the same concept. For details of their implementation, please refer to the method embodiments, which will not be repeated here.

[0140] This disclosure also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium that a computer device can store, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct a computing device to perform a method for arranging a fiber optic microphone array and a method for sensitivity detection.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound source localization device, characterized in that, The sound source localization device includes multiple lasers (1), a wave combiner (2), a first optical coupler (3), multiple sound detection units (4), and a controller (5); The plurality of lasers (1) are electrically connected to the controller (5) respectively, and the plurality of lasers (1) are optically connected to the combiner (2) respectively; The multiplexer (2) is optically connected to the first optical coupler (3); The first optical coupler (3) is optically connected to each sound detection unit (4); Each sound detection unit (4) is electrically connected to the controller (5).

2. The sound source localization device according to claim 1, characterized in that, The plurality of lasers (1) are optically connected to the plurality of split ports (2a) of the multiplexer (2), and the multiplexing port (2b) of the multiplexer (2) is optically connected to the first optical coupler (3).

3. The sound source localization device according to claim 2, characterized in that, The combining port (3a) of the first optical coupler (3) is optically connected to the combining port (2b) of the multiplexer (2), and the splitting port (3b) of the first optical coupler (3) is optically connected to each sound detection unit (4).

4. The sound source localization device according to claim 3, characterized in that, Each of the sound detection units (4) includes a second optical coupler (41), an optical fiber microphone (42), and a photodetector (43); The first branch port (41a) of each second optical coupler (41) is optically connected to one branch port (3b) of the first optical coupler (3); The combining port (41b) of each second optical coupler (41) is optically connected to the corresponding fiber optic microphone (42); The second branch port (41c) of each second optical coupler (41) is optically connected to the corresponding photodetector (43); Each photodetector (43) is electrically connected to the controller (5).

5. The sound source localization device according to claim 4, characterized in that, The fiber optic microphone (42) includes a frame (421), a flange (422), a ceramic ferrule (423), a soft washer (424), a diaphragm (425), a hard washer (426), and a pressure device (427); The frame (421) includes a connected base plate (4211) and a side wall (4212), the base plate (4211) having a first mounting hole (4211a), the side wall (4212) having an annular mounting groove (4212a), and the base plate (4211) and / or the side wall (4212) having a vent hole (421a); The flange (422) is connected to the frame (421), and the flange (422) has a second mounting hole (422a) opposite to the first mounting hole (4211a); The ceramic ferrule (423) is fixed in the first mounting hole (4211a) and the second mounting hole (422a), and the ceramic ferrule (423) is used to fix the optical fiber; The soft washer (424) is fixed in the annular mounting groove (4212a); The diaphragm (425) is located at one end of the side wall (4212) away from the base plate (4211), and is connected to the surface of the soft washer (424) outside the annular mounting groove (4212a), and forms a cavity with the base plate (4211) and the side wall (4212); The hard washer (426) is located on the side of the diaphragm (425) away from the soft washer (424), opposite to the soft washer (424), and is connected to the diaphragm (425); The pressure device (427) is connected to the frame (421) and is used to uniformly apply pressure toward the diaphragm (425) to various positions on the surface of the hard gasket (426) away from the diaphragm (425).

6. A method for arranging an optical fiber microphone array, characterized in that, The method is applied to the sound source localization device as described in claim 4, and the method includes: Based on preset maximum and minimum microphone spacing, the positions of multiple virtual microphones are determined on a spoke structure line in a plane. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of each line segment is located at the center of the circle. Based on the preset sound source location, the preset noise source location, and the locations of the multiple virtual microphones, a simulated sound emission and sound collection process is performed to obtain the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location collected by the multiple virtual microphones. The suppression ratio is determined based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location. If the suppression ratio is less than or equal to the suppression ratio threshold, the positions of the plurality of virtual microphones are adjusted on the spoke structure line, and the process of simulating sound generation and sound collection is performed based on the preset sound source position, the preset noise source position and the positions of the plurality of virtual microphones. If the suppression ratio is greater than the suppression ratio threshold, then the positions of the multiple fiber optic microphones (42) are set based on the positions of the multiple virtual microphones.

7. A method for sensitivity detection, characterized in that, The method is applied to the sound source localization device as described in any one of claims 1-5, and the method includes: When the sound source emits a sound of the target intensity, the controller (5) acquires the light intensity output by each photodetector (43); Based on the light intensity output by each photodetector (43) and the sound intensity of the target, the controller (5) determines the sensitivity of the sound source localization device.

8. A fiber optic microphone array arrangement device, characterized in that, The device is used in the sound source localization device as described in claim 4, the device comprising: The determination module is used to determine the positions of multiple virtual microphones on a spoke structure line in a plane based on preset maximum and minimum microphone spacing. The spoke structure line includes multiple concentric circles and multiple circumferentially evenly distributed line segments passing through the center of the circles. The length of each line segment is the same as the diameter of the largest circle among the multiple concentric circles, and the midpoint of each line segment is located at the center of the circle. The simulation module is used to simulate the sound generation and sound collection process based on the preset sound source location, the preset noise source location, and the locations of the multiple virtual microphones, to obtain the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location collected by the multiple virtual microphones. The determining module is used to determine the suppression ratio based on the sound energy corresponding to the sound source location and the sound energy corresponding to the noise source location; An adjustment module is used to adjust the position of the plurality of virtual microphones on the spoke structure line if the suppression ratio is less than or equal to the suppression ratio threshold, and switch to performing a simulated sound generation and sound collection process based on a preset sound source position, a preset noise source position and the position of the plurality of virtual microphones. The setting module is used to set the positions of multiple fiber optic microphones (42) based on the positions of the multiple virtual microphones if the suppression ratio is greater than the suppression ratio threshold.

9. A sensitivity detection device, characterized in that, The device is used in the sound source localization device as described in any one of claims 1-5, and the device comprises: The acquisition module is used to acquire the light intensity output by each photodetector (43) when the sound source emits a sound with the target sound intensity. The determination module is used to determine the sensitivity of the sound source localization device based on the light intensity output by each photodetector (43) and the sound intensity of the target.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program code, and when the computer program code is executed by a computer device, the computer device performs the method described in any one of claims 6 and 7.

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