DESC:FIELD OF THE INVENTION

The present disclosure generally relates to the field of sensing systems for pipelines, and particularly, the present disclosure relates to a leak detection system for a pipeline and a method for leak detection in the pipeline.

BACKGROUND

Pressurized pipelines carrying fluid, such as a gas or a liquid sometimes suffer cracks which result in leakages in the pipeline. Further, in order to detect leaks, an acoustic sensor is used in pipeline inspections to capture audio data for the purpose of detecting leaks. Conventionally, a pipeline inspection gauge is used that has a single microphone mounted inside the pipeline and is used for inspection which generates noisy and weak audio data in response to the noise generated due to the leaks.

There are various limitations associated with the current technique and setup. Due to external factors, the audio signal that is received inside the pipeline inspection gauge is noisy and weak. By using a single microphone, the audio data captured is not sufficiently audible for detecting the leaks in the pipeline. Specifically, the use of a single microphone has problems, such as less accuracy in a noisy environment, difficulty in filtering out noise from leaks, weak strength of the audio signal, and difficulty in determining the directionality of the signal. Moreover, the single microphone may detect the leakage but may not be able to assist in locating the leak and manual inspection is needed to find the leakage. However, manual inspection is a labor-intensive task that requires dedicated skill and is prone to human-related errors. Moreover, manual inspection is not suitable because the pipelines are carrying hazardous fluids.

SUMMARY
This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention nor intended for determining the scope of the invention.

The present disclosure relates to a listening device for sensing a sound in a pipeline. The listening device is adapted to be deployed in a predetermined orientation in the pipeline. The listening device includes a housing wherein a Printed Circuit Board (PCB) is disposed along an inner surface of the housing. The listening device further includes an array of stereoscopic pairs of microphones mounted on the PCB. Each of the stereoscopic pairs of microphones is adapted to detect the sound in the pipeline. A difference in a time of arrival of the sound at each of the microphones in one of the pairs of stereoscopic microphones is indicative of a directionality of the sound. A difference in a time of arrival between at least two pairs of stereoscopic microphones from the plurality of pairs of stereoscopic microphones is indicative of a location of a leakage in the pipeline.

The present disclosure further discloses a leak detection system for detecting leakage in a pipeline. The leak detection system includes a listening device for sensing a sound in the pipeline. The listening device is adapted to be deployed in a predetermined orientation in the pipeline. The listening device includes a housing wherein a Printed Circuit Board (PCB) is disposed along an inner surface of the housing. The listening device further includes an array of stereoscopic pairs of microphones mounted on the PCB. Each of the stereoscopic pairs of microphones is adapted to detect the sound in the pipeline. A difference in a time of arrival of the sound at each of the microphones in one of the pairs of stereoscopic microphones is indicative of a directionality of the sound. A difference in a time of arrival between at least two pairs of stereoscopic microphones from the plurality of pairs of stereoscopic microphones is indicative of a location of a leakage in the pipeline. The leak detection system further includes a control device in communication with the listening device and positioned externally to the pipeline. The control device is adapted to detect the leakage and identify a location of the leakage. A directionality of the sound is based on a difference in a time of arrival of the sound at each of the microphones in one of the pairs of stereoscopic microphones. The location of the leakage is based on a difference in a time of arrival of the sound between at least two pairs of stereoscopic microphones from the plurality of pairs of stereoscopic microphones.

The present disclosure further discloses a method of detecting and locating leakage in a pipeline using a leak detection system. The method includes receiving a sound in the pipeline by a plurality of pairs of stereoscopic microphones, wherein the plurality of pairs of stereoscopic microphones are positioned in a PCB placed inside a listening device. A sound signal is generated by each of the pairs of stereoscopic microphones corresponding to the sound received by the plurality of pairs of stereoscopic microphones. A control device determines the directionality of the sound and the location of the leakage. The control device is in communication with the plurality of pairs of stereoscopic microphones and is positioned externally to the pipeline. The directionality of the sound is determined based on a difference in the time of arrival at each of the microphones in one of the pairs of stereoscopic microphones. The location of the leakage is determined based on a difference in the time of arrival between at least two pairs of stereoscopic microphones from the plurality of pairs of stereoscopic microphones.

The leak detection system and method disclosed herein help in increasing the performance of in-line pipeline inspection gauges. Further, the leak detection system helps in capturing leak sound precisely and in developing better leak detection algorithms. Also, the leak detection device of the present disclosure accurately identifies the sound generated from the leakage from other noises propagating through the pipeline and the flowing fluid therein thereby making the leak detection device impervious to errors. Further, the leak detection system reduces the uncertainty of the presence of leakage in the pipeline. Furthermore, the leak detection system has the ability to determine the directionality of leak noise.

To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

Figure 1 illustrates a schematic diagram of a leak detection system, according to an embodiment of the present disclosure;
Figure 2 illustrates a listening device of the leak detection system, according to an embodiment of the present disclosure; and
Figure 3 illustrates a method of detecting and locating the leakage, according to an embodiment of the present disclosure.

Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.

For example, the term “some” as used herein may be understood as “none” or “one” or “more than one” or “all.” Therefore, the terms “none,” “one,” “more than one,” “more than one, but not all” or “all” would fall under the definition of “some.” It should be appreciated by a person skilled in the art that the terminology and structure employed herein is for describing, teaching, and illuminating some embodiments and their specific features and elements and therefore, should not be construed to limit, restrict or reduce the spirit and scope of the present disclosure in any way.

For example, any terms used herein such as, “includes,” “comprises,” “has,” “consists,” and similar grammatical variants do not specify an exact limitation or restriction, and certainly do not exclude the possible addition of one or more features or elements, unless otherwise stated. Further, such terms must not be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated, for example, by using the limiting language including, but not limited to, “must comprise” or “needs to include.”

Whether or not a certain feature or element was limited to being used only once, it may still be referred to as “one or more features” or “one or more elements” or “at least one feature” or “at least one element.” Furthermore, the use of the terms “one or more” or “at least one” feature or element do not preclude there being none of that feature or element, unless otherwise specified by limiting language including, but not limited to, “there needs to be one or more…” or “one or more elements is required.”

Unless otherwise defined, all terms and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by a person ordinarily skilled in the art.

Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements of the present disclosure. Some embodiments have been described for the purpose of explaining one or more of the potential ways in which the specific features and/or elements of the proposed disclosure fulfil the requirements of uniqueness, utility, and non-obviousness.

Use of the phrases and/or terms including, but not limited to, “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “further embodiment”, “furthermore embodiment”, “additional embodiment” or other variants thereof do not necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment, or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or in the context of more than one embodiment, or in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

Any particular and all details set forth herein are used in the context of some embodiments and therefore should not necessarily be taken as limiting factors to the proposed disclosure.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The present disclosure relates to a leak detection system for detecting leakage in a pipeline, in accordance with one embodiment of the present disclosure. The leak detection system is deployed in a pipeline and is adapted to detect as well as locate the leakage in the pipeline.

Figure 1 illustrates a leak detection system 100 for detecting a leakage (not shown) in a pipeline (not shown). In one example, the pipeline may be a pressurized pipeline carrying gas or oil. The leak detection system 100 includes a listening device 102 and a control device 104. The listening device 102 is adapted to be deployed in a predetermined orientation in the pipeline. In one embodiment, the listening device 102 is adapted to be deployed in an interior of the pipeline in the predetermined orientation. The listening device 102 is adapted to listen to the sounds in the pipeline and accordingly generates sound signals. The control device 104 is in communication with the listening device and is positioned externally to the pipeline. The control device 104 is adapted to detect the leakage and identify a location of the leakage by processing the sound signals received from the listening device 102.

The construction and functioning of the listening device 102 and the control device 104 shall now be discussed in detail with reference to Figure 1 and Figure 2. Specifically, Figure 2 illustrates a listening device 102 of the leak detection system 100. The listening device 102 includes a housing (not shown), a Printed Circuit Board (PCB) 204, and a plurality of stereoscopic pairs of microphones 202 (202A-202D, 202E-202B, 202F-202C), as shown in Figure 2. In one example, the listening device 102 is installed at a predefined orientation inside the pipeline, such that minimal obstruction is presented to the fluid flow in the pipeline. Alternatively, the listening device 102 may be deployed inside the pipeline during inspection along with pipe inspection gauge(s) (PIGs). In either case, the listening device 102 is deployed to listen to the sounds in the pipelines.

The PCB 204 is disposed along an inner surface (not shown) of the housing. There may be a small air gap (approx. 1cm) between the microphones 202 and the inner surface. In one embodiment, the housing is spherical in shape. The plurality of stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C are mounted on the PCB 204. In one embodiment, the plurality of stereoscopic pairs of microphones are placed on the PCB in a circular array. A diametrically opposite pair of microphones 202A-202D, 202E-202B, 202F-202C forms a stereoscopic pair. For example, the microphone 202A, and the microphone 202D are diametrically opposite to each other and form one stereoscopic pair of microphones 202. Similarly, microphones 202B, 202E form another stereoscopic pair of microphones 202, and 202C, 202F form yet another stereoscopic pair of microphones 202. Although the present illustrations show 6 microphones, the PCB can have 4, 8, 10, 12, and even more microphones 202 depending upon the size of the pipe and the resolution of sound to listen to.

Each of the stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C are adapted to detect the sound in the pipeline. In one embodiment, each of the pairs of stereoscopic microphones 202 is connected to separate data lines. In the illustrated example, the microphones 202 in the stereoscopic pairs have a single output line for transmitting the sound signal to the controller 104, and accordingly, as illustrated herein, the listening device 102 has three data lines that communicate the sound signals to the control device 104, either directly or via saving the sound signals as recording on an SD-card. It is to be understood that the number of data lines has been mentioned as three only for illustrative purposes, as the number of pairs of stereoscopic microphones illustrated herein is three 202A-202D, 202E-202B, 202F-202C. The number of data lines may increase with an increase in the number of stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C.

The stereoscopic configuration of microphones 202 provides higher accuracy even in a noisy environment. Multiple microphones 202 help in capturing the sound simultaneously after which filtering out noises using Digital Signal Processing (DSP) methods is done. Other noises apart from leak noise can be filtered out in a much easier way by virtue of the stereoscopic configuration of the microphones 202. Further, the stereoscopic configuration helps in increasing the strength of the sound signal, thereby enhancing the audio quality. Furthermore, the directionality of the signal can be determined with help of the stereoscopic configuration, which helps in locating the leakage(s).

A method for detecting and locating leakage in the pipeline shall now be explained in detail with reference to Figure 3. Specifically, Figure 3 illustrates the method 300 for detecting and locating the leakage in the pipeline. The method 300 is explained in conjunction with Figures 1 and 2. As explained above, in order to reduce the noise and improve the signal strength, the plurality of stereoscopic pairs of microphones 202 is used. The number of microphones 202 can be increased to increase the audibility of the audio data. Using the stereoscopic configuration of the microphones 202, in addition to improving the signal fidelity, the directionality of the signal can be determined, which aids in locating the position of the leak with respect to a Pipeline Inspection Gauge (PIGs).

To determine the directionality of the leak with respect to the microphones 202, 3 pairs of microphones 202 are installed in a circular array with a 60° angular separation from the center of the circle of the PCB shown in Figure 2. The microphones 202 that are opposite to each other are connected to a single data line in a stereo configuration. This is necessary to detect the directionality, so a total of 3 data lines are present. If adjacent microphones are connected, or the microphones are connected in any other fashion, then it is not possible to determine the directionality of the leak. The data from the 3 data lines are saved simultaneously to the SD-card mounted on the PCB. Once recorded, the SD-card is removed and coupled to the controller 104 to post-process the recorded data to determine the directionality of the leak, increase the signal-to-noise ratio, and to also eliminate undesirable interferences.

At block 302, the method 300 includes receiving, by the plurality of stereoscopic pairs of microphones 202, a sound in the pipeline. After receiving the sound, at block 304, the method 300 includes generating, by each of the pair of stereoscopic microphones 202, a sound signal corresponding to the sound received by the plurality of stereoscopic pairs of microphones 202.

In one embodiment, the sound signals may be a part of data being transmitted from the microphones 202 to the control device 104 for further processing through the data lines. In such a scenario, the data is received by the control device 104 from each of the pair of stereoscopic microphones through the data lines, wherein the data corresponds to the time of arrival of the sound at each of the pair of stereoscopic microphones 202. The control device 104 then eliminates undesired signal components from the data to obtain a desired data component for each of the pair of stereoscopic microphones 202. In one example, signal processing algorithms are applied to filter out echoes, reduce background noise, etc. from the sound signals. The echoes and background data can be considered as the undesired data components, and the filtered sound signals can be considered as the desired data component.

At block 306, the method 300 includes determining, by the control device 104, a directionality of the sound based on a difference in a time of arrival at each of the microphones 202 in one of the stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C. Further, the control device 104 also determines the location of the leakage based on a difference in a time of arrival between at least two stereoscopic pairs of microphones 202A-202D, 202E-202B, from the plurality of stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C.

In one embodiment, the directionality of the sound is based on the difference in the desired data component corresponding to the time of arrival of the sound at each of the microphones 202A, 202B, 202C, 202D, 202E, 202F in one of the stereoscopic pairs of microphones 202A-202D, 202E-202B, 202F-202C. In one embodiment, determining the directionality includes identifying a vector of the sound based on the comparison of the desired data component of each of the pair of stereoscopic microphones 202. If a particular sound reaches microphone 1 first compared to microphone 2, it is determined that the sound is coming from the vector pointed towards microphone 1 with the base at microphone 2. In one example, the sampling frequency and the spacing between the pair of microphones (diameter of PCB) also matter in order to calculate the directionality. In one example, the microphones 202 may be sampled at 16 kHz, with the speed of sound in air being approx. 343 m/s, the minimum diameter of the circular array may amount to roughly 2.1 cm. It is important that the microphones 202 have uniform sensitivity over the sound frequency of interest (0 to 8 kHz – Nyquist frequency) so that the sound at a particular frequency is not distorted. If so, it could negatively impact the directionality of the leak.

Further, the location of the leakage is based on the difference in the desired data component corresponding to the time of arrival of the sound between at least two stereoscopic pairs of microphones from the plurality of stereoscopic pairs of microphones.

A difference in the time of arrival of the sound at each of the microphones 202 in one of the pairs of stereoscopic microphones 202A-202D, 202E-202B, 202F-202C is indicative of a directionality of the sound. A difference in the time of arrival between at least two pairs of stereoscopic microphones 202A-202D, 202E-202B, 202F-202C from the plurality of pairs of stereoscopic microphones 202 is indicative of a location of a leakage in the pipeline.

In an embodiment, the control device 104 may include but is not limited to, a processor, memory, modules, and data. The processor can be a single processing unit or several units, all of which could include multiple computing units. The processor may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the processor is configured to fetch and execute computer-readable instructions and data stored in the memory.

The memory may include any non-transitory computer-readable medium known in the art including, for example, volatile memory, such as static random-access memory (SRAM) and dynamic random-access memory (DRAM), and/or non-volatile memory, such as read-only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.

The modules, amongst other things, include routines, programs, objects, components, data structures, etc., which perform particular tasks or implement data types. The modules may also be implemented as, digital signal processor(s), state machine(s), logic circuitries, and/or any other device or component that manipulate signals based on operational instructions.

Further, the modules can be implemented in hardware, instructions executed by a processing unit, or by a combination thereof. The processing unit may comprise a computer, a processor, such as a state machine, a logic array, or any other suitable devices capable of processing instructions. The processing unit can be a general-purpose processor which executes instructions to cause the general-purpose processor to perform the required tasks or, the processing unit can be dedicated to performing the required functions. In another embodiment of the present disclosure, the modules may be machine-readable instructions (software) that, when executed by a processor/processing unit, perform any of the described functionalities. Further, the data serves, amongst other things, as a repository for storing data processed, received, and generated by one or more of the modules.

The leak detection system 100 and method 300 disclosed herein help in increasing the performance of in-line pipeline inspection gauges. Further, the leak detection system 100 helps in capturing leak sound precisely and in developing better leak detection algorithms. Also, the leak detection system 100 of the present disclosure accurately identifies the sound generated from the leakage from other noises propagating through the pipeline and the flowing fluid therein thereby making the leak detection system 100 impervious to errors. Further, the leak detection system 100 reduces the uncertainty of the presence of leakage in the pipeline. Furthermore, the leak detection system 100 has the ability to determine the directionality of leak noise.

While specific language has been used to describe the present disclosure, any limitations arising on account thereto, are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein. The drawings and the foregoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. ,CLAIMS:1. A listening device (102) for sensing a sound in a pipeline and adapted to be deployed in a predetermined orientation in the pipeline, the listening device (102) comprising:
a housing;
a Printed Circuit Board (PCB) (204) disposed along an inner surface of the housing; and
a plurality of stereoscopic pairs of microphones (202) mounted on the PCB (204), each of the stereoscopic pairs of microphones (202) adapted to detect the sound in the pipeline, wherein:
a difference in a time of arrival of the sound at each of the microphones (202A, 202B, 202C, 202D, 202E, 202F) in one of the stereoscopic pairs of microphones (202) is indicative of a direction of the sound, and
a difference in a time of arrival between at least two stereoscopic pairs of microphones (202A-202D, 202E-202B) from the plurality of stereoscopic pairs of microphones (202) is indicative of a location of a leakage in the pipeline.

2. The listening device (102) as claimed in claim 1, wherein the housing is spherical in shape.

3. The listening device (102) as claimed in claim 1, wherein the plurality of stereoscopic pairs of microphones (202) are placed on the PCB (204) in a circular array.

4. A leak detection system (100) for detecting a leakage in a pipeline, comprising:
a listening device (102) for sensing a sound in the pipeline and adapted to be deployed in a predetermined orientation in the pipeline, the listening device (102) comprising:
a housing;
a Printed Circuit Board (PCB) (204) disposed along an inner surface of the housing; and
a plurality of stereoscopic pairs of microphones (202) mounted on the PCB, each of the stereoscopic pairs of microphones (202) adapted to detect the sound in the pipeline; and
a control device (104) in communication with the listening device (102) and positioned externally to the pipeline, the control device (104) adapted to detect the leakage and identify a location of the leakage, wherein:
a directionality of the sound is based on a difference in a time of arrival of the sound at each of the microphones (202) in one of the stereoscopic pairs of microphones (202A-202D, 202E-202B, 202C-202F), and
the location of the leakage is based on a difference in a time of arrival of the sound between at least two stereoscopic pairs of microphones (202A-202D, 202E-202B) from the plurality of stereoscopic pairs of microphones (202).

5. The leak detection system (100) as claimed in claim 4, wherein the listening device (102) is adapted to be deployed in an interior of the pipeline in the predetermined orientation.

6. The leak detection system (100) as claimed in claim 4, wherein each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F) is connected to separate data lines.

7. The leak detection system (100) as claimed in claim 6, wherein the control device (104) is adapted to:
receive data from each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F) through the data lines, wherein the data corresponds to the time of arrival of the sound at each of the pair of microphones (202A-202D, 202E-202B, 202C-202F);
eliminate undesired signal components from the data to obtain a desired data component for each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F); and
calculate:
the directionality of the sound, based on the difference in the desired data component corresponding to the time of arrival of the sound at each of the microphones (202) in one of the stereoscopic pairs of microphones (202A-202D, 202E-202B, 202C-202F), and
the location of the leakage, based on the difference in the desired data component corresponding to the time of arrival of the sound between at least two stereoscopic pairs of microphones (202A-202D, 202E-202B) from the plurality of stereoscopic pairs of microphones (202).

8. A method (300) for detecting and locating a leakage in a pipeline using a leak detection system, the method comprising:
receiving, by a plurality of stereoscopic pairs of microphones (202), a sound in the pipeline, wherein the plurality of stereoscopic pairs of microphones (202) are positioned in a PCB (204) placed inside a listening device (102);
generating, by each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F), a sound signal corresponding to the sound received by the plurality of stereoscopic pairs of microphones (202); and
determining, by the control device (104):
a directionality of the sound is based on a difference in a time of arrival at each of the microphones (202A, 202B, 202C, 202D, 202E, 202F) in one of the stereoscopic pairs of microphones (202A-202D, 202E-202B, 202C-202F), and
the location of the leakage is based on a difference in a time of arrival between at least two stereoscopic pairs of microphones (202A-202D, 202E-202B) from the plurality of stereoscopic pairs of microphones (202),
wherein the control device (104) is in communication with the plurality of stereoscopic pairs of microphones (202) and is positioned externally to the pipeline.

9. The method (300) as claimed in claim 8, wherein determining the directionality includes identifying a vector of the sound based on the comparison of the desired data component of each of the pair of stereoscopic microphones (202).

10. The method (300) as claimed in claim 8, wherein detecting the leakage and identifying the location for the leakage comprises:
receiving, by the control device (104), data from each of the pair of stereoscopic microphones through the data lines, wherein the data corresponds to the time of arrival of the sound at each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F);
eliminating, by the control device (104), undesired signal components from the data to obtain a desired data component for each of the pair of stereoscopic microphones (202A-202D, 202E-202B, 202C-202F);
determining, by the control device (104):
the directionality of the sound, based on the difference in the desired data component corresponding to the time of arrival of the sound at each of the microphones (202A, 202B, 202C, 202D, 202E, 202F) in one of the stereoscopic pairs of microphones (202A-202D, 202E-202B, 202C-202F), and
the location of the leakage, based on the difference in the desired data component corresponding to the time of arrival of the sound between at least two stereoscopic pairs of microphones (202A-202D, 202E-202B) from the plurality of stereoscopic pairs of microphones (202A-202D, 202E-202B, 202C-202F).