A sound source localization system and a method for determining the location of a sound source

Abstract

This invention relates to the field of leak monitoring technology, and discloses a sound source localization system and a method for determining the location of a sound source. The sound source localization system includes: an acoustic camera acquiring a first acoustic image of the sound source; a displacement mechanism connected to the acoustic camera; a data processing control module signal-connected to both the acoustic camera and the displacement mechanism; the data processing control module acquiring a first peak noise sound pressure level SPL1 from the first acoustic image; and, after controlling the displacement mechanism to move the acoustic camera relative to the sound source by a distance dL, acquiring a second peak noise sound pressure level SPL2 from the second acoustic image using the acoustic camera, and finally obtaining the position of the sound source relative to the acoustic camera. This application obtains the first peak noise sound pressure level SPL1 and the second peak noise sound pressure level SPL2 by adjusting the relative position of the acoustic camera and the sound source, further obtaining the relative position of the sound source, so as to further locate the sound source fault point, promptly carry out disposal measures, and realize unattended fault monitoring.

Description

Technical Field

[0001] This invention relates to the field of leakage monitoring technology, specifically to a sound source localization system and a method for determining the location of a sound source. Background Technology

[0002] In the process of locating a sound source using an acoustic camera, the acoustic camera captures the sound source to form a two-dimensional cloud map, and then the two-dimensional cloud map is superimposed on the two-dimensional image captured by the optical camera, thereby realizing the location of the sound source in the two-dimensional image.

[0003] However, for scenes with a certain depth, relying solely on a single acoustic camera to collect sound sources and obtain distance information cannot provide the coordinates of the sound source in real space. Summary of the Invention

[0004] In view of this, the present invention provides a sound source localization system to solve the problem that in scenes with a certain depth, relying solely on a single acoustic camera to collect sound source data and obtain distance information cannot provide the coordinate position of the sound source in real space.

[0005] In a first aspect, the present invention provides a sound source localization system, comprising:

[0006] An acoustic camera, suitable for obtaining the first acoustic image of a sound source;

[0007] A displacement mechanism is connected to the acoustic camera;

[0008] The data processing control module is signal-connected to both the acoustic camera and the displacement mechanism. The data processing control module is adapted to obtain a first peak noise sound pressure level (SPL1) from a first acoustic image; and after controlling the displacement mechanism to move the acoustic camera relative to the sound source by a distance dL, it obtains a second peak noise sound pressure level (SPL2) from the acoustic camera in a second acoustic image, and ultimately obtains the position of the sound source relative to the acoustic camera. Beneficial effects: This application adopts the above technical solution, and by adjusting the relative position of the acoustic camera and the sound source, obtains the first peak noise sound pressure level (SPL1) and the second peak noise sound pressure level (SPL2), further obtaining the relative position of the sound source, so as to further locate the sound source fault point, promptly carry out disposal measures, and realize unattended fault monitoring.

[0009] Optionally, the displacement mechanism includes:

[0010] A bracket on which the acoustic camera is mounted;

[0011] The bracket is slidably connected to the slide rail.

[0012] A power component is signal-connected to the data processing and control module, and the power component is adapted to provide rotational power.

[0013] One end of the lead screw is connected to the power component, and the other end of the lead screw is threadedly connected to the bracket;

[0014] The displacement mechanism is adapted to rotate the lead screw under the control of the data processing control module, thereby causing the bracket to slide along the direction set by the lead screw on the slide rail, and finally moving the acoustic camera.

[0015] Optionally, the sliding rail is positioned in the same direction as the acoustic camera's shooting direction.

[0016] Optionally, the power component is a servo motor.

[0017] Optionally, the acoustic camera's shooting direction is parallel to the horizontal ground.

[0018] Optionally, the moving distance dL is the distance the acoustic camera moves away from the sound source.

[0019] Secondly, the present invention also provides a method for determining the location of a sound source, using the aforementioned sound source localization system, comprising:

[0020] Assuming the initial distance between the acoustic camera and the sound source is L, calculate L according to equation (1);

[0021] (1)

[0022] Assuming the acoustic camera has a horizontal field of view of [missing information] Assuming the acoustic camera's vertical viewing angle range is The horizontal dimension dm of the sound source in the first acoustic image is calculated according to formula (2); the vertical dimension dn of the sound source in the first acoustic image is calculated according to formula (3).

[0023] (2)

[0024] (3)

[0025] Assume the center pixel of the acoustic camera has coordinates (0,0) in the first acoustic image, the first acoustic image has m pixels in the horizontal direction and n pixels in the vertical direction; the coordinates of the sound source in the first acoustic image are (x1,y1); then the distance Lx1 between the sound source and the acoustic camera in the physical world in the horizontal direction is calculated according to equation (4), and the distance Ly1 between the sound source and the acoustic camera in the physical world in the vertical direction is calculated according to equation (5).

[0026] (4)

[0027] (5)

[0028] The data processing control module determines (Lx1, Ly1) according to the above steps, thus obtaining the relative positional relationship between the sound source and the acoustic camera. Beneficial effects: This application adopts the above technical solution, calculates the distance between the sound source and the acoustic camera, further deduces the spatial coordinates of the sound source, locates the fault location of the sound source, and promptly carries out corresponding emergency response measures, ultimately achieving unattended fault monitoring.

[0029] Optionally, it also includes:

[0030] When the sound source is located at a leak point in the pipeline system, the data processing control module establishes and stores a three-dimensional model of the pipeline system with the acoustic camera as the initial position. The position coordinates (Lx1, Ly1) of the sound source are projected onto the three-dimensional model of the pipeline system to determine the location of the leak point.

[0031] Optionally, the sound source is a steady-state noise source.

[0032] Optionally, it also includes:

[0033] The data processing and control module closes the remote-controlled valve on the pipeline system that prevents leakage based on the location of the leak point. Beneficial effect: This application adopts the above technical solution, which, by promptly detecting the location of the leak point and taking timely measures to close the remote-controlled valve, prevents the leakage accident from further escalating. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a connection diagram of the sound source localization system provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the coordinate settings of the first sonographic image provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the horizontal viewing angle range of the acoustic camera provided in an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram showing the vertical viewing angle range of the acoustic camera provided in an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Acoustic camera; 2. Communication cable; 3. Data processing control module; 4. Power component; 5. Lead screw; 6. Ground; 7. Sound source; 8. Remote control valve; 9. Piping system; 10. First control cable; 11. Second control cable; 12. Slide rail; 13. Bracket; 14. Center pixel; 15. Center axis. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0042] like Figure 1 One specific implementation of the sound source localization system shown includes: an acoustic camera 1, a displacement mechanism, and a data processing and control module 3.

[0043] The acoustic camera 1 is adapted to obtain a first acoustic image of the sound source 7, which is the acoustic image obtained by the acoustic camera 1 at its initial position. The displacement mechanism is connected to the acoustic camera 1. The data processing control module 3 is signal-connected to both the acoustic camera 1 and the displacement mechanism; specifically, the data processing control module 3 and the acoustic camera 1 can be signal-connected via a communication cable 2; the data processing control module 3 can be signal-connected to the displacement mechanism via a second control cable 11. The data processing control module 3 is adapted to obtain a first peak noise sound pressure level SPL1 from the first acoustic image; and after controlling the displacement mechanism to move the acoustic camera 1 a distance dL relative to the sound source 7, obtain a second peak noise sound pressure level SPL2 from the second acoustic image through the acoustic camera 1, and finally obtain the position of the sound source 7 relative to the acoustic camera 1 through analysis and processing. Finally, the displacement mechanism moves the acoustic camera 1 back to its initial position.

[0044] Specifically, the displacement mechanism includes a bracket 13, a slide rail 12, a power component 4, and a lead screw 5. The acoustic camera 1 is mounted on the bracket 13. The bracket 13 is slidably connected to the slide rail 12. The power component 4 is signal-connected to the data processing control module 3, and the power component 4 is adapted to provide rotational power. One end of the lead screw 5 is connected to the power component 4, and the other end of the lead screw 5 is threadedly connected to the bracket 13. Under the control of the data processing control module 3, the displacement mechanism is adapted such that the power component 4 drives the lead screw 5 to rotate, thereby driving the bracket 13 to slide along the direction of the lead screw 5 on the slide rail 12, and ultimately driving the acoustic camera 1 to move. The bottom end of the bracket 13 is slidably connected to the slide rail 12, and the acoustic camera 1 is fixed to the top end of the bracket 13. The data processing control module 3 is signal-connected to the power component 4 through a second control cable 11.

[0045] Specifically, the sliding rail 12 is positioned in the same direction as the shooting direction of the acoustic camera 1.

[0046] Specifically, the power component 4 is a servo motor.

[0047] Specifically, such as Figure 1 As shown, the shooting direction of the acoustic camera 1 is parallel to the horizontal ground 6. The power component 4 is fixed on the ground 6, and the slide rail 12 is fixed on the ground 6. When the sound source 7 is located at the leak point of the pipeline system 9, a leak in the pipeline system 9 will generate a sound source 7, which will be captured by the acoustic camera 1, forming an acoustic image, and transmitted to the data processing and control module 3.

[0048] Specifically, the moving distance dL is the distance that the acoustic camera 1 moves away from the sound source 7.

[0049] refer to Figures 1 to 4 As shown, the present invention also provides a method for determining the location of a sound source, which, using the aforementioned sound source localization system, includes the following steps:

[0050] S1. Assuming the initial distance between acoustic camera 1 and sound source 7 is L, calculate L according to formula (1);

[0051] (1)

[0052] S2, such as Figure 3 and Figure 4 As shown, in the initial position, assume that the viewing angle range of acoustic camera 1 in the horizontal direction is... Assuming the vertical viewing angle range of acoustic camera 1 is... The horizontal dimension dm of the sound source 7 in the first acoustic image is calculated according to formula (2); the vertical dimension dn of the sound source 7 in the first acoustic image is calculated according to formula (3).

[0053] (2)

[0054] (3)

[0055] S3, such as Figure 2 As shown, assuming the center pixel 14 of acoustic camera 1 has coordinates (0,0) in the first acoustic image, the first acoustic image has m pixels in the horizontal direction and n pixels in the vertical direction; the coordinates of sound source 7 in the first acoustic image are (x1,y1); then the distance Lx1 between sound source 7 and acoustic camera 1 in the physical world along the horizontal direction is calculated according to equation (4), such as Figure 3 As shown, the horizontal distance Lx1 between the central axis 15 of the acoustic camera 1 and the sound source 7 is calculated. The vertical distance Ly1 between the sound source 7 and the acoustic camera 1 in the physical world is calculated according to equation (5), as follows: Figure 4 As shown, the distance Ly1 between the central axis 15 of the acoustic camera 1 and the sound source 7 in the vertical direction. The physical world refers to the real world.

[0056] (4)

[0057] (5)

[0058] The data processing control module 3 determines (Lx1, Ly1) according to the above steps, and then obtains the relative positional relationship between the sound source 7 and the acoustic camera 1.

[0059] Specifically, the method for determining the location of a sound source described in this application further includes: when the sound source 7 is located at a leak point in the pipeline system 9, the data processing control module 3 establishes and stores a three-dimensional model of the pipeline system 9 with the acoustic camera 1 as the initial position, and projects the position coordinates (Lx1, Ly1) of the sound source 7 onto the three-dimensional model of the pipeline system 9 to determine the location of the leak point. The three-dimensional model is drawn at a 1:1 scale according to the actual size.

[0060] Specifically, the sound source is a steady-state noise source.

[0061] Furthermore, the method for determining the location of a sound source described in this application further includes: the data processing control module 3 closing the remote control valve 8 on the pipeline system 9 to prevent leakage from the leak point, based on the location of the leak point. Figure 1 As shown, the data processing control module 3 and the remote control valve 8 are connected by a signal via the first control cable 10.

[0062] This application employs a displacement mechanism to automatically adjust the relative positions of the acoustic camera 1 and the sound source 7, calculates the distance L between the sound source 7 and the acoustic camera 1, and further calculates the spatial coordinates of the sound source 7. These spatial coordinates are then compared with the three-dimensional model of the pipeline system 9 in the data processing control module 3 to locate the fault point, i.e., the leak point. Corresponding emergency response measures are then promptly implemented, ultimately achieving unattended fault monitoring and handling. The fault source applicable to this technical solution can be a steady-state noise source. Taking the industrial pipeline system 9 as an example, when gas leaks, the leak point will emit steady-state noise.

[0063] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A sound source positioning system, characterized by include: An acoustic camera (1) is adapted to obtain a first acoustic image of the sound source (7); The displacement mechanism is connected to the acoustic camera (1); The data processing control module (3) is signal-connected to both the acoustic camera (1) and the displacement mechanism; the data processing control module (3) is adapted to obtain the first peak noise sound pressure level SPL1 through the first acoustic image; And after the control displacement mechanism drives the acoustic camera (1) to move a distance dL relative to the sound source (7), the second peak noise sound pressure level SPL2 of the second acoustic image is obtained through the acoustic camera (1), and finally the position of the sound source (7) relative to the acoustic camera (1) is obtained. The displacement mechanism includes: The acoustic camera (1) is mounted on a bracket (13). The slide rail (12) and the bracket (13) are slidably connected to the slide rail (12); The power component (4) is signal-connected to the data processing control module (3), and the power component (4) is adapted to provide rotational power; One end of the lead screw (5) is connected to the power component (4), and the other end of the lead screw (5) is threadedly connected to the bracket (13); The displacement mechanism is adapted to be controlled by the data processing control module (3), whereby the power component (4) drives the lead screw (5) to rotate, thereby driving the bracket (13) to slide along the setting direction of the lead screw (5) on the slide rail (12), and finally driving the acoustic camera (1) to move. When the sound source (7) is located at the leak point of the pipeline system (9), a leak will be generated in the pipeline system (9), which will be captured by the acoustic camera (1), forming an acoustic image, and transmitted to the data processing control module (3).

2. The acoustic source positioning system of claim 1, wherein, The sliding rail (12) is set in the same direction as the shooting direction of the acoustic camera (1).

3. The acoustic source positioning system of claim 1, wherein, The power component (4) is a servo motor.

4. The acoustic source positioning system according to any one of claims 1-3, characterized in that, The shooting direction of the acoustic camera (1) is parallel to the horizontal ground (6).

5. The sound source localization system according to any one of claims 1-3, characterized in that, The moving distance dL is the distance that the acoustic camera (1) moves away from the sound source (7).

6. A method for determining the location of a sound source, using the sound source localization system according to any one of claims 1-5, characterized in that, include: Assuming the initial distance between the acoustic camera (1) and the sound source (7) is L, calculate L according to equation (1); （1） Assume the acoustic camera (1) has a horizontal viewing angle range of... Assuming the acoustic camera (1) has a vertical viewing angle range of... The horizontal dimension dm of the sound source (7) in the first acoustic image is calculated according to formula (2); the vertical dimension dn of the sound source (7) in the first acoustic image is calculated according to formula (3). （2） （3） Assume that the center pixel (14) of the acoustic camera (1) has coordinates (0,0) in the first acoustic image, the first acoustic image has m pixels in the horizontal direction and n pixels in the vertical direction; the coordinates of the sound source (7) in the first acoustic image are (x1,y1); then the distance Lx1 between the sound source (7) and the acoustic camera (1) in the physical world in the horizontal direction is calculated according to formula (4), and the distance Ly1 between the sound source (7) and the acoustic camera (1) in the physical world in the vertical direction is calculated according to formula (5); （4） （5） The data processing control module (3) determines (Lx1,Ly1) according to the above steps, and then obtains the relative positional relationship between the sound source (7) and the acoustic camera (1).

7. The method for determining the location of a sound source according to claim 6, characterized in that, Also includes: When the sound source (7) is located at the leak point of the pipeline system (9), the data processing control module (3) establishes and stores a three-dimensional model of the pipeline system (9) with the acoustic camera (1) as the initial position. The position coordinates (Lx1, Ly1) of the sound source (7) are projected onto the three-dimensional model of the pipeline system (9) to determine the location of the leak point.

8. The method for determining the location of a sound source according to claim 7, characterized in that, The sound source (7) is a steady-state noise source.

9. The method for determining the location of a sound source according to claim 8, characterized in that, Also includes: The data processing control module (3) closes the remote control valve (8) on the pipeline system (9) to prevent leakage from the leak point according to the location of the leak point.

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