Method and device for testing background noise filtering performance of transformer substation noise monitoring device

Abstract

The invention discloses a background noise filtering performance test method and device for a transformer substation noise monitoring device. The method comprises the steps of outputting a standard sound signal and a background noise signal through a signal generator of a sound source system according to preset multiple test conditions, transmitting the standard sound signal and the background noise signal to a noise monitoring device for multiple tests, and obtaining a sound pressure level and a sound signal vector of the noise monitoring device in each test; sound pressure deviation is calculated according to the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level; calculating the sound quality according to the sound signal vectors of multiple tests of the noise monitoring device and the standard sound signal vector; and determining the background noise filtering performance of the noise monitoring device according to the sound pressure deviation and the sound quality of the noise monitoring device.

Description

Technical Field

[0001] The present invention relates to the field of acoustic measurement technology, and more specifically, to a background noise filtering performance test method and device for a noise monitoring device of a substation. Background Art

[0002] Noise emission is the focus of environmental protection complaints in power grids. In order to strengthen the prevention and control of industrial noise pollution throughout the process, noise monitoring at the plant boundary during the operation of substations is the focus of technical supervision of environmental protection in power grids. When measuring, the noise monitoring device will not only record the noise emitted in the substation, such as the main transformer noise, high-voltage reactor noise, converter transformer capacitor group noise, smoothing reactor noise, and conductor corona noise, but also background noise such as insect chirping, bird calls, locomotive whistle, and human voices, which will affect the accuracy of noise emission measurement values. According to the national environmental protection standard HJ 706-2014 "Correction of noise measurement values ​​in environmental noise monitoring technical specifications", when the difference between the noise measurement value and the background noise is between 3dB and 10dB, the noise emission should be corrected accordingly in different intervals of 3dB, 4-5dB, and 6-10dB according to the difference. However, when the substation is in operation, it is impossible to shut down the noise source and measure the background noise alone, and it is difficult to correct the noise emission according to the standard. To this end, in recent years, equipment manufacturers have developed substation noise monitoring devices that can filter out background noise. These devices are usually based on spectral subtraction or deep learning algorithms. However, there is currently a lack of laboratory test verification methods for background noise filtering performance, which affects the credibility of noise measurement results. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method and device for testing the background noise filtering performance of a noise monitoring device in a substation.

[0004] According to one aspect of the present invention, a method for testing the background noise filtering performance of a substation noise monitoring device is provided, comprising:

[0005] The signal generator of the sound source system outputs the standard sound signal and the background noise signal according to the preset multiple test conditions and transmits them to the noise monitoring device for multiple tests, and obtains the sound pressure level and the sound signal vector of the noise monitoring device in each test;

[0006] Calculate the sound pressure deviation based on the sound pressure level of multiple tests of the noise monitoring device and the initial sound pressure level;

[0007] Calculate the sound quality based on the sound signal vectors of multiple tests of the noise monitoring device and the standard sound signal vectors;

[0008] The background noise filtering performance of the noise monitoring device is determined based on the sound pressure deviation and sound quality of the noise monitoring device.

[0009] Optionally, the sound source system includes: a signal generator, a power amplifier and a speaker, and the noise monitoring device includes a microphone and a collection and analysis module, wherein the collection and analysis module is integrated with a background noise filtering algorithm, and

[0010] The signal generator is used to generate a standard sound signal and a background noise signal, which are transmitted to the microphone of the noise monitoring device through a power amplifier and a speaker in sequence, and then transmitted to the acquisition and analysis module.

[0011] Optionally, the loudspeaker and the microphone of the noise monitoring device are located at the same height at a preset height above the ground and are arranged at a preset distance.

[0012] Optionally, the test is conducted in an anechoic or semi-anechoic chamber and,

[0013] The signal generator of the sound source system outputs the standard sound signal and the background noise signal according to the preset test conditions and transmits them to the noise monitoring device for multiple tests to obtain the sound pressure level information and the sound signal vector of the noise monitoring device for each test, including:

[0014] Using a signal generator to output only a standard sound signal, adjusting the signal amplitude and the power amplifier so that the sound pressure level indication of the noise monitoring device is the initial sound pressure level, and recording the standard sound signal vector s of the noise monitoring device;

[0015] The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is a first preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the first sound pressure level C1 and the first sound signal C2 of the noise monitoring device are recorded.

[0016] Number Vector

[0017] The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is a second preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the second sound pressure level C2 of the noise monitoring device and the second sound signal are recorded.

[0018] Number Vector

[0019] The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is the third preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the third sound pressure level C3 of the noise monitoring device and the third sound pressure level C4 of the noise monitoring device are recorded.

[0020] Acoustic signal vector

[0021] Optionally, the sound pressure deviation is calculated based on the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level, including:

[0022] Performing subtraction operations on the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level respectively to obtain multiple initial sound pressure deviations;

[0023] The sound pressure deviation is determined based on a maximum value among the plurality of initial sound pressure deviations.

[0024] Optionally, the sound quality is calculated based on the sound signal vectors and the standard sound signal of multiple tests of the noise monitoring device, including:

[0025] The sound quality of the sound signal vectors and the standard sound signal vectors of the noise monitoring device during multiple tests are calculated to obtain multiple initial sound qualities;

[0026] The sound quality is determined according to a minimum value of the plurality of initial sound qualities.

[0027] Optionally, the sound quality SI-SDR is calculated as:

[0028]

[0029] in, s target for Projection in the horizontal direction of s; e noise for The projection in the vertical direction of s, is the experimental sound signal vector, and s is the standard sound signal vector.

[0030] Optionally, determining the background noise filtering performance of the noise monitoring device according to the sound pressure deviation and the sound quality of the noise monitoring device includes:

[0031] When the sound pressure deviation is less than the first threshold and the sound quality is greater than the second threshold, it is determined that the background noise filtering performance of the noise monitoring device is good; otherwise, it is determined that the background noise filtering performance of the noise monitoring device is poor.

[0032] According to another aspect of the present invention, there is provided a background noise filtering performance test device for a substation noise monitoring device, comprising:

[0033] A test module, used to output a standard sound signal and a background noise signal through a signal generator of a sound source system according to preset multiple test conditions and transmit them to a noise monitoring device for multiple tests, and obtain a sound pressure level and a sound signal vector of the noise monitoring device in each test;

[0034] A first calculation module is used to calculate the sound pressure deviation according to the sound pressure level of multiple tests of the noise monitoring device and the initial sound pressure level;

[0035] A second calculation module is used to calculate the sound quality according to the sound signal vectors and the standard sound signal vectors of multiple tests of the noise monitoring device;

[0036] The determination module is used to determine the background noise filtering performance of the noise monitoring device according to the sound pressure deviation and sound quality of the noise monitoring device.

[0037] Optionally, the sound source system includes: a signal generator, a power amplifier and a speaker, and the noise monitoring device includes a microphone and a collection and analysis module, wherein the collection and analysis module is integrated with a background noise filtering algorithm, and

[0038] The signal generator is used to generate a standard sound signal and a background noise signal, which are transmitted to the microphone of the noise monitoring device through a power amplifier and a speaker in sequence, and then transmitted to the acquisition and analysis module.

[0039] Optionally, the loudspeaker and the microphone of the noise monitoring device are located at the same height at a preset height above the ground and are arranged at a preset distance.

[0040] Optionally, the test is conducted in an anechoic or semi-anechoic chamber and,

[0041] Test modules include:

[0042] The first test submodule is used to use the signal generator to output only the standard sound signal, adjust the signal amplitude and the power amplifier so that the sound pressure level indication of the noise monitoring device is the initial sound pressure level, and record the standard sound signal vector s of the noise monitoring device;

[0043] The second test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is the first preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the first sound pressure level C1 of the noise monitoring device and the first sound signal vector

[0044] The third test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a second preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the second sound pressure level C2 of the noise monitoring device and the second sound signal vector

[0045] The fourth test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a third preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the third sound pressure level sound pressure C3 of the noise monitoring device and the third sound signal vector

[0046] Optionally, the first computing module includes:

[0047] A difference submodule is used to perform difference operations on the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level, respectively, to obtain multiple initial sound pressure deviations;

[0048] The first determination submodule is configured to determine the sound pressure deviation according to a maximum value among a plurality of initial sound pressure deviations.

[0049] Optionally, the second computing module includes:

[0050] A calculation submodule, used to calculate the sound quality of the sound signal vectors and the standard sound signal vectors of the noise monitoring device in multiple tests, and obtain multiple initial sound qualities;

[0051] The second determining submodule is configured to determine the sound quality according to a minimum value of the multiple initial sound qualities.

[0052] Optionally, the sound quality SI-SDR is calculated as:

[0053]

[0054] in, s target for Projection in the horizontal direction of s; e noise for The projection in the vertical direction of s, is the experimental sound signal vector, and s is the standard sound signal vector.

[0055] Optionally, a module is determined, including:

[0056] The determination submodule is used to determine that the background noise filtering performance of the noise monitoring device is good when the sound pressure deviation is less than the first threshold and the sound quality is greater than the second threshold, otherwise determine that the background noise filtering performance of the noise monitoring device is poor.

[0057] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present invention.

[0058] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of the above aspects of the present invention.

[0059] Therefore, the present invention proposes a background noise filtering performance test method for a substation noise monitoring device. By designing multiple tests, the sound pressure level and acoustic signal vector of the noise monitoring device in each test are obtained to evaluate the background noise filtering performance of the noise monitoring device, and the effectiveness of the background noise filtering performance and the accuracy of the substation noise sound pressure level measurement after filtering the background noise are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0061] Figure 1 It is a flow chart of a background noise filtering performance test method of a substation noise monitoring device provided by an exemplary embodiment of the present invention;

[0062] Figure 2 is a schematic diagram of a laboratory test arrangement provided by an exemplary embodiment of the present invention;

[0063] Figure 3 It is a structural schematic diagram of a background noise filtering performance test device of a substation noise monitoring device provided by an exemplary embodiment of the present invention;

[0064] Figure 4 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0065] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0066] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0067] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0068] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0069] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0070] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0071] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0072] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0073] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0074] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0075] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0076] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0077] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0078] Exemplary Methods

[0079] Figure 1 1 is a flow chart of a method for testing the background noise filtering performance of a noise monitoring device for a substation according to an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the background noise filtering performance test method 100 of the substation noise monitoring device includes the following steps:

[0080] Step 101, outputting a standard sound signal and a background noise signal according to preset multiple test conditions through a signal generator of a sound source system and transmitting them to a noise monitoring device for multiple tests, and obtaining a sound pressure level and a sound signal vector of the noise monitoring device for each test;

[0081] Step 102, calculating the sound pressure deviation according to the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level;

[0082] Step 103, calculating the sound quality according to the sound signal vectors of multiple tests of the noise monitoring device and the standard sound signal vector;

[0083] Step 104: Determine the background noise filtering performance of the noise monitoring device according to the sound pressure deviation and the sound quality of the noise monitoring device.

[0084] Specifically, the existing technical solutions illustrate the effectiveness of the substation noise monitoring device in filtering out background noise at the level of digital simulation, but lack laboratory test verification methods and have certain limitations.

[0085] The invention provides a background noise filtering performance test method for a substation noise monitoring device, which evaluates the effectiveness of the background noise filtering performance and the accuracy of the substation noise sound pressure level measurement after filtering the background noise.

[0086] like Figure 2 The specific test method is as follows:

[0087] 1) Preparation

[0088] The test is carried out in an anechoic or semi-anechoic chamber.

[0089] The sound source system consists of a signal generator, a power amplifier, and a speaker. The signal generator can generate standard sound signals and background noise signals. The standard sound signal is a wide-band signal in the range of 100Hz to 8000Hz, and the background noise signal is a typical noise signal such as insects, birds, and vehicles.

[0090] The noise monitoring device to be tested consists of a microphone and an acquisition and analysis module, wherein the acquisition and analysis module integrates a background noise filtering algorithm. The loudspeaker of the sound source system and the microphone of the noise monitoring device to be tested are at the same height of 1m to 1.5m above the ground, and the distance between the two is 1m.

[0091] 2) Test process

[0092] a) The signal generator only outputs the standard sound signal, and the signal amplitude and power amplifier are adjusted so that the sound pressure level indication of the noise monitoring device is 50dB, and the recorded sound signal vector is s;

[0093] b) The signal generator only outputs the background noise signal, and adjusts the signal amplitude so that the sound pressure level indication of the noise monitoring device is 50-3=47dB. Then the signal generator simultaneously outputs the standard sound signal and the background noise signal. The sound pressure of the noise monitoring device is recorded as C1, and the sound signal vector is recorded as

[0094] c) The signal generator only outputs the background noise signal, and adjusts the signal amplitude so that the sound pressure level indication of the noise monitoring device is 50-5=45dB. Then the signal generator simultaneously outputs the standard sound signal and the background noise signal. The sound pressure of the noise monitoring device is recorded as C2, and the sound signal vector is recorded as

[0095] d) The signal generator only outputs the background noise signal, and adjusts the signal amplitude so that the sound pressure level indication of the noise monitoring device is 50-8=42dB. Then the signal generator simultaneously outputs the standard sound signal and the background noise signal. The sound pressure of the noise monitoring device is recorded as C3, and the sound signal vector is recorded as

[0096] e) Sound pressure detection and evaluation: The sound pressure deviation δ (δ i =C i -50) to evaluate the sound pressure result after background noise is filtered out, and the maximum δ i (i.e. max(δ i )) to make a judgment, when max(δ i )<1dB, it means that the sound pressure increment caused by the background noise is less than 1dB, and it is considered that the noise monitoring device has good background noise filtering performance.

[0097] f) Sound quality detection and evaluation: The signal-to-distortion ratio (SI-SDR) is used to evaluate the sound quality after background noise is filtered out.

[0098]

[0099] Where: s target —— Projection in the horizontal direction of s; e noise —— The projection in the vertical direction of s.

[0100] Take the minimum SI-SDR, i.e. min(SI-SDR), for judgment. When min(SI-SDR)>10dB, it means that the filtered sound is close to the standard sound signal, and it is considered that the noise monitoring device has good background noise filtering performance.

[0101] Compared with the existing method that only illustrates the effectiveness of filtering background noise of the substation noise monitoring device at the level of digital simulation, the present invention has the following characteristics:

[0102] 1) A test method for filtering background noise performance of substation noise monitoring device in an anechoic chamber or semi-anechoic chamber is proposed, and the test verification results are highly reliable.

[0103] 2) A sound pressure detection and evaluation method for background noise filtering of substation noise monitoring device is proposed, and the accuracy of sound pressure measurement after background noise filtering is evaluated by sound pressure deviation.

[0104] 3) A sound quality detection and evaluation method for background noise filtering of substation noise monitoring device is proposed, and the accuracy of sound signal measurement after background noise filtering is evaluated by signal distortion ratio.

[0105] Exemplary Devices

[0106] Figure 3 1 is a schematic diagram of the structure of a background noise filtering performance test device for a substation noise monitoring device provided by an exemplary embodiment of the present invention. Figure 3 As shown, the device 300 includes:

[0107] The test module 310 is used to output the standard sound signal and the background noise signal according to the preset multiple test conditions through the signal generator of the sound source system and transmit them to the noise monitoring device for multiple tests, and obtain the sound pressure level and the sound signal vector of the noise monitoring device in each test;

[0108] A first calculation module 320 is used to calculate the sound pressure deviation according to the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level;

[0109] A second calculation module is used to calculate the sound quality according to the sound signal vectors and the standard sound signal vectors of multiple tests of the noise monitoring device;

[0110] The determination module is used to determine the background noise filtering performance of the noise monitoring device according to the sound pressure deviation and sound quality of the noise monitoring device.

[0111] Optionally, the sound source system includes: a signal generator, a power amplifier and a speaker, and the noise monitoring device includes a microphone and a collection and analysis module, wherein the collection and analysis module is integrated with a background noise filtering algorithm, and

[0112] The signal generator is used to generate a standard sound signal and a background noise signal, which are transmitted to the microphone of the noise monitoring device through a power amplifier and a speaker in sequence, and then transmitted to the acquisition and analysis module.

[0113] Optionally, the loudspeaker and the microphone of the noise monitoring device are located at the same height at a preset height above the ground and are arranged at a preset distance.

[0114] Optionally, the test is conducted in an anechoic or semi-anechoic chamber and,

[0115] The test module 310 includes:

[0116] The first test submodule is used to use the signal generator to output only the standard sound signal, adjust the signal amplitude and the power amplifier so that the sound pressure level indication of the noise monitoring device is the initial sound pressure level, and record the standard sound signal vector s of the noise monitoring device;

[0117] The second test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is the first preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the first sound pressure level C1 of the noise monitoring device and the first sound signal vector

[0118] The third test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a second preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the second sound pressure level C2 of the noise monitoring device and the second sound signal vector

[0119] The fourth test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a third preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the third sound pressure level sound pressure C3 of the noise monitoring device and the third sound signal vector

[0120] Optionally, the first calculation module 320 includes:

[0121] A difference submodule is used to perform difference operations on the sound pressure levels of multiple tests of the noise monitoring device and the initial sound pressure level, respectively, to obtain multiple initial sound pressure deviations;

[0122] The first determination submodule is configured to determine the sound pressure deviation according to a maximum value among a plurality of initial sound pressure deviations.

[0123] Optionally, the second calculation module 330 includes:

[0124] A calculation submodule, used to calculate the sound quality of the sound signal vectors and the standard sound signal vectors of the noise monitoring device in multiple tests, and obtain multiple initial sound qualities;

[0125] The second determining submodule is configured to determine the sound quality according to a minimum value of the multiple initial sound qualities.

[0126] Optionally, the sound quality SI-SDR is calculated as:

[0127]

[0128] in, s target for Projection in the horizontal direction of s; e noise for The projection in the vertical direction of s, is the experimental sound signal vector, and s is the standard sound signal vector.

[0129] Optionally, the determination module 340 includes:

[0130] The determination submodule is used to determine that the background noise filtering performance of the noise monitoring device is good when the sound pressure deviation is less than the first threshold and the sound quality is greater than the second threshold, otherwise determine that the background noise filtering performance of the noise monitoring device is poor.

[0131] Exemplary Electronic Devices

[0132] Figure 4 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 4 As shown, the electronic device 40 includes one or more processors 41 and a memory 42 .

[0133] The processor 41 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0134] The memory 42 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 41 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may also include: an input device 43 and an output device 44, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0135] In addition, the input device 43 may also include, for example, a keyboard, a mouse, etc.

[0136] The output device 44 can output various information to the outside, and can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0137] Of course, to simplify, Figure 4 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0138] Exemplary computer program products and computer-readable storage media

[0139] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above-mentioned "Exemplary Method" section of this specification.

[0140] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0141] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0142] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0143] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0144] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0145] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0146] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware or any combination of software, hardware, firmware. The above order of steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

[0147] It should also be noted that in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but in accordance with the widest range consistent with the principles and novel features disclosed here.

[0148] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A background noise filtering performance test method for a substation noise monitoring device, characterized in that: include: Outputting a standard sound signal and a background noise signal according to preset test conditions through a signal generator of a sound source system and transmitting them to a noise monitoring device for multiple tests, and obtaining a sound pressure level and a sound signal vector of the noise monitoring device in each test; Calculating a sound pressure deviation based on the sound pressure level and the initial sound pressure level of the noise monitoring device during multiple tests; Calculating sound quality based on the sound signal vector and the standard sound signal vector tested multiple times by the noise monitoring device; The background noise filtering performance of the noise monitoring device is determined according to the sound pressure deviation of the noise monitoring device and the sound quality.

2. The method according to claim 1, characterized in that The sound source system includes: a signal generator, a power amplifier and a speaker, the noise monitoring device includes a microphone and a collection and analysis module, wherein the collection and analysis module is integrated with a background noise filtering algorithm, and The signal generator is used to generate a standard sound signal and a background noise signal, which are transmitted to the microphone of the noise monitoring device through the power amplifier and the speaker in sequence, and then transmitted to the acquisition and analysis module.

3. The method according to claim 2, characterized in that The loudspeaker and the microphone of the noise monitoring device are located at the same height at a preset height from the ground and are arranged at a preset distance.

4. The method according to claim 1, characterized in that: The test is carried out in an anechoic or semi-anechoic chamber and The signal generator of the sound source system outputs a standard sound signal and a background noise signal according to preset multiple test conditions and transmits them to the noise monitoring device for multiple tests, and obtains the sound pressure level information and the sound signal vector of the noise monitoring device in each test, including: Utilize the signal generator to output only the standard sound signal, adjust the signal amplitude and the power amplifier so that the sound pressure level indication of the noise monitoring device is the initial sound pressure level, and record the standard sound signal vector s of the noise monitoring device; The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is a first preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the first sound pressure level C1 and the first sound signal vector of the noise monitoring device are recorded. The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is a second preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the second sound pressure level C2 and the second sound signal vector of the noise monitoring device are recorded. The signal generator is used to output only the background noise signal, and the signal amplitude is adjusted so that the sound pressure level indication of the noise monitoring device is a third preset sound pressure value. Then, the signal generator is used to simultaneously output the standard sound signal and the background noise signal, and the third sound pressure level sound pressure C3 of the noise monitoring device and the third sound signal vector are recorded.

5. The method according to claim 1, characterized in that Calculating the sound pressure deviation according to the sound pressure level and the initial sound pressure level of the noise monitoring device tested multiple times, including: Performing subtraction operations on the sound pressure levels obtained by multiple tests of the noise monitoring device and the initial sound pressure level, respectively, to obtain multiple initial sound pressure deviations; The sound pressure deviation is determined according to a maximum value among a plurality of initial sound pressure deviations.

6. The method according to claim 1, characterized in that Calculating the sound quality according to the sound signal vector and the standard sound signal tested multiple times by the noise monitoring device includes: Performing sound quality calculations on the sound signal vectors and the standard sound signal vectors tested multiple times by the noise monitoring device to obtain multiple initial sound masses; The sound quality is determined according to a minimum value of a plurality of initial sound qualities.

7. The method according to claim 1, characterized in that The calculation formula of the sound quality SI-SDR is: in, s t arge t for Projection in the horizontal direction of s; e noise for The projection in the vertical direction of s, is the experimental sound signal vector, and s is the standard sound signal vector.

8. The method according to claim 1, characterized in that Determining the background noise filtering performance of the noise monitoring device according to the sound pressure deviation of the noise monitoring device and the sound quality includes: When the sound pressure deviation is less than a first threshold and the sound quality is greater than a second threshold, it is determined that the background noise filtering performance of the noise monitoring device is good; otherwise, it is determined that the background noise filtering performance of the noise monitoring device is poor.

9. A background noise filtering performance test device for a substation noise monitoring device, characterized in that: include: A test module, used to output a standard sound signal and a background noise signal according to preset multiple test conditions through a signal generator of a sound source system and transmit them to a noise monitoring device for multiple tests, and obtain a sound pressure level and a sound signal vector of the noise monitoring device in each test; A first calculation module is used to calculate the sound pressure deviation according to the sound pressure level and the initial sound pressure level of the noise monitoring device tested multiple times; A second calculation module is used to calculate the sound quality according to the sound signal vector and the standard sound signal vector tested multiple times by the noise monitoring device; The determination module is used to determine the background noise filtering performance of the noise monitoring device according to the sound pressure deviation of the noise monitoring device and the sound quality.

10. The device according to claim 9, characterized in that The sound source system includes: a signal generator, a power amplifier and a speaker, the noise monitoring device includes a microphone and a collection and analysis module, wherein the collection and analysis module is integrated with a background noise filtering algorithm, and The signal generator is used to generate a standard sound signal and a background noise signal, which are transmitted to the microphone of the noise monitoring device through the power amplifier and the speaker in sequence, and then transmitted to the acquisition and analysis module.

11. The device according to claim 10, characterized in that The loudspeaker and the microphone of the noise monitoring device are located at the same height at a preset height from the ground and are arranged at a preset distance.

12. The device according to claim 9, characterized in that The test is carried out in an anechoic or semi-anechoic chamber and Test modules include: A first test submodule is used for using the signal generator to output only the standard sound signal, adjusting the signal amplitude and the power amplifier so that the sound pressure level indication of the noise monitoring device is the initial sound pressure level, and recording the standard sound signal vector s of the noise monitoring device; The second test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a first preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the first sound pressure level C1 of the noise monitoring device and the first sound signal vector The third test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a second preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the second sound pressure level C2 of the noise monitoring device and the second sound signal vector The fourth test submodule is used to use the signal generator to output only the background noise signal, adjust the signal amplitude, so that the sound pressure level indication of the noise monitoring device is a third preset sound pressure value, and then use the signal generator to simultaneously output the standard sound signal and the background noise signal, and record the third sound pressure level sound pressure C3 of the noise monitoring device and the third sound signal vector 13. The device according to claim 9, characterized in that The first computing module includes: A difference submodule, used for performing difference operations on the sound pressure level and the initial sound pressure level of the noise monitoring device tested multiple times, respectively, to obtain multiple initial sound pressure deviations; The first determination submodule is configured to determine the sound pressure deviation according to a maximum value among a plurality of initial sound pressure deviations.

14. The device according to claim 9, characterized in that The second computing module includes: A calculation submodule, used for respectively calculating the sound quality of the sound signal vector and the standard sound signal vector tested multiple times by the noise monitoring device to obtain multiple initial sound qualities; The second determining submodule is configured to determine the sound quality according to a minimum value of a plurality of initial sound qualities.

15. The device according to claim 9, characterized in that The calculation formula of the sound quality SI-SDR is: in, s t arge t for Projection in the horizontal direction of s; e no i se for The projection in the vertical direction of s, is the experimental sound signal vector, and s is the standard sound signal vector.

16. The device according to claim 9, characterized in that Identify modules, including: The determination submodule is used to determine that the background noise filtering performance of the noise monitoring device is good when the sound pressure deviation is less than a first threshold and the sound quality is greater than a second threshold, otherwise determine that the background noise filtering performance of the noise monitoring device is poor.

17. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 8.

18. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-8.

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