Noise reduction method and device for power supply with pickup function

Abstract

The invention discloses a noise reduction method and device for a power supply with a pickup function, and relates to the technical field of electronic equipment detection. Converting the first environment noise to obtain a first digital signal; acquiring a first low-frequency signal from the first digital signal, and generating a first inverted low-frequency signal according to a first frequency and a first phase corresponding to the first low-frequency signal; after the first low-frequency signal and the first inverted low-frequency signal are preliminarily neutralized, when the first decibel value is larger than or equal to a preset decibel value, the first inverted low-frequency signal is adjusted according to the first decibel value, and a first corrected inverted low-frequency signal is obtained; neutralizing the first corrected inverted low-frequency signal with the first low-frequency signal; and when the second decibel value is smaller than the preset decibel value, determining that the first corrected inverted low-frequency signal is in a normal noise reduction state, so as to perform noise reduction on the detection area according to the first corrected inverted low-frequency signal. By implementing the technical scheme provided by the invention, the problem that the sound insulation material is poor in low-frequency noise suppression effect is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment detection, and in particular to a method and device for reducing noise of a power supply with a sound pickup function. Background Art

[0002] In the field of electronic product testing, the vibration and friction of various components in production workshops during operation generate acoustic signals with specific frequency characteristics. Power supply units equipped with sound pickup capabilities can capture these acoustic signals in real time. In-depth analysis of this collected sound data provides early insight into potential equipment failures, enabling rational maintenance plans and preventive maintenance. This effectively reduces disruption to production processes caused by sudden equipment failures and ensures continuous and stable production.

[0003] However, the acoustic environment of a production workshop is complex. Besides the effective acoustic signals generated by the vibration and friction of equipment components, it is also filled with various noises generated during equipment operation. These noises can intersect with the effective acoustic signals, distorting the sound signals collected by the sound pickup system. This inaccurately reflects the equipment's true operating status, potentially misleading assessments of equipment health and impacting the scientific and effective nature of equipment maintenance decisions. To suppress the interference of noise on the picked-up signals, sound insulation materials or passive noise reduction technologies can be used to absorb and attenuate the noise. However, the acoustic properties of sound insulation materials dictate their superior absorption of high-frequency noise. However, the noise energy generated by most noise sources in a production workshop is primarily concentrated in the low-frequency range. Sound insulation materials have poor absorption performance for low-frequency noise, making it difficult to effectively reduce its intensity. This can lead to skewed test results for power supplies with sound pickup in complex acoustic environments.

[0004] Therefore, there is an urgent need for a noise reduction method and device for a power supply with a sound pickup function that can solve the above technical problems. Summary of the Invention

[0005] The present application provides a noise reduction method and device for a power supply with a sound pickup function. The method can solve the problem that sound insulation materials and passive noise reduction technology are not effective in suppressing low-frequency noise, thereby avoiding deviations in the test results of the power supply with a sound pickup function in a complex acoustic environment.

[0006] In a first aspect, the present application provides a noise reduction method for a power supply with a sound pickup function, the method comprising: receiving a first environmental noise, the first environmental noise being obtained by using a target device to collect noise in a detection area; converting the first environmental noise to obtain a first electrical signal; performing analog-to-digital conversion on the first electrical signal to obtain a first digital signal; obtaining a first low-frequency signal from the first digital signal, obtaining a first frequency and a first phase corresponding to the first low-frequency signal, generating a first inverted low-frequency signal according to the first frequency and the first phase, the first inverted low-frequency signal being a signal with the same frequency and opposite phase as the first low-frequency signal; converting the first low-frequency signal into ... After the signal is preliminarily neutralized with the first inverted low-frequency signal, a first decibel value is obtained; it is determined whether the first decibel value is greater than or equal to a preset decibel value; when the first decibel value is greater than or equal to the preset decibel value, the first inverted low-frequency signal is adjusted according to the first decibel value to obtain a first corrected inverted low-frequency signal; after the first corrected inverted low-frequency signal is neutralized with the first low-frequency signal, a second decibel value is obtained; it is determined whether the second decibel value is less than the preset decibel value; when the second decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state, so that the noise of the detection area is reduced according to the first corrected inverted low-frequency signal.

[0007] By adopting the above technical solution, the collected first environmental noise is first converted into a first electrical signal, and then the first digital signal is obtained through analog-to-digital conversion. The first low-frequency signal is obtained from the first digital signal, and its corresponding first frequency and first phase are accurately obtained, thereby ensuring accurate analysis and processing of the noise signal, and providing a basis for the subsequent generation of an accurate inverted low-frequency signal; after the generated first inverted low-frequency signal is preliminarily neutralized with the first low-frequency signal, the first decibel value is obtained, and it is determined whether the first decibel value is greater than or equal to the preset decibel value, the noise reduction effect can be preliminarily evaluated. If the first decibel value is still high, it means that the preliminarily generated inverted low-frequency signal may not be accurate enough or the strength is insufficient. When the first decibel value is greater than or equal to the preset decibel value , the first inverted low-frequency signal is adjusted according to the first decibel value to obtain a first corrected inverted low-frequency signal, and then the first corrected inverted low-frequency signal is neutralized with the first low-frequency signal, and the second decibel value is obtained again, and it is determined whether the second decibel value is less than the preset decibel value. Through this feedback adjustment mechanism, the inverted low-frequency signal can be continuously optimized so that it can be more accurately offset with the original low-frequency noise signal, thereby improving the noise reduction effect. When the second decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state, and the noise of the detection area is reduced according to the first corrected inverted low-frequency signal, which can significantly reduce the interference of noise on the pickup signal, thereby improving the accuracy of the test results of the power supply with pickup function in a complex acoustic environment.

[0008] Optionally, obtaining a first low-frequency signal from a first digital signal specifically includes: performing frequency domain analysis on the first digital signal to obtain a frequency domain signal; obtaining multiple signal components from the frequency domain signal, and obtaining frequencies corresponding to each of the multiple signal components; determining a second frequency corresponding to the first signal component, where the first signal component is any one of the multiple signal components; judging whether the second frequency is greater than or equal to a preset frequency; when the second frequency is less than the preset frequency, determining to include the first signal component in a target set so as to obtain the first low-frequency signal from the target set; when the second frequency is greater than or equal to the preset frequency, determining to eliminate the first signal component and obtain a third frequency corresponding to the second signal component, where the second signal component is any one of the multiple signal components except the first signal component; when the third frequency is less than the preset frequency, determining to include the second signal component in the target set.

[0009] By adopting the above technical solution, the first digital signal is subjected to frequency domain analysis, and the time domain signal is converted into a frequency domain signal, which can clearly display the distribution of each frequency component in the signal, so that signal components of different frequencies can be accurately identified and distinguished. By setting a preset frequency, the signal components below the frequency are summarized into a target set, thereby achieving accurate extraction of low-frequency signals. Signal components greater than or equal to the preset frequency are eliminated, thereby removing the interference of high-frequency noise on the extraction of low-frequency signals. The low-frequency signals are summarized into the target set, and special noise reduction processing can be performed on these signals, such as generating an inverted low-frequency signal for neutralization. Targeted processing can more effectively reduce the intensity of low-frequency noise and improve the noise reduction effect.

[0010] Optionally, the first inverted low-frequency signal is adjusted according to the first decibel value to obtain a first corrected inverted low-frequency signal, specifically including: obtaining a first difference, the first difference being the difference between the first decibel value and a preset decibel value; inputting the first difference into a preset reference table for query to obtain an attenuation ratio; adjusting the amplitude of the first inverted low-frequency signal according to the attenuation ratio to obtain a first corrected inverted low-frequency signal.

[0011] By adopting the above technical solution, the first difference between the first decibel value and the preset decibel value is calculated, so that the gap between the current noise level and the desired noise reduction target can be accurately quantified. The first difference is input into a preset reference table for query to obtain an attenuation ratio. By querying the preset reference table, the optimal noise reduction intensity for the current noise level can be dynamically determined. According to the attenuation ratio obtained from the query, the amplitude of the first inverted low-frequency signal is adjusted to obtain a first corrected inverted low-frequency signal. This dynamic adjustment method can ensure that the amplitude of the inverted low-frequency signal matches the amplitude of the original noise signal, thereby achieving more effective noise cancellation and reducing residual noise.

[0012] Optionally, when the second decibel value is less than the preset decibel value, after determining that the first corrected inverted low-frequency signal is in a normal noise reduction state, the method further includes: obtaining a third decibel value at a preset time interval; calculating the third decibel value and the preset decibel value to obtain a second difference; judging whether the second difference is greater than the preset difference; when the second difference is greater than the preset difference, determining that the first corrected inverted low-frequency signal is in a noise reduction abnormal state; re-acquiring the second environmental noise collected by the target device according to the noise reduction abnormal state; converting the second environmental noise to obtain a second electrical signal; performing analog-to-digital conversion on the second electrical signal to obtain a second digital signal; and obtaining a second digital signal from the second A second low-frequency signal is obtained from the digital signal, a fourth frequency and a second phase corresponding to the second low-frequency signal are obtained, and a second inverted low-frequency signal is generated according to the fourth frequency and the second phase, wherein the second inverted low-frequency signal and the second low-frequency signal have the same frequency and opposite phase; after initially neutralizing the second inverted low-frequency signal with the second low-frequency signal, a fourth decibel value is obtained; it is determined whether the fourth decibel value is greater than or equal to a preset decibel value; when the fourth decibel value is less than the preset decibel value, it is determined to replace the first corrected inverted low-frequency signal in the detection area with the second inverted low-frequency signal, so as to perform noise reduction on the detection area according to the second inverted low-frequency signal.

[0013] By adopting the above technical solution, the third decibel value is obtained at preset time intervals, the noise level changes in the noise reduction area can be monitored in real time, the second difference between the third decibel value and the preset decibel value is calculated, and it is determined whether the second difference is greater than the preset difference, and whether the noise reduction effect is abnormal can be accurately identified. When the second difference is greater than the preset difference, it is determined that the first corrected inverted low-frequency signal is in an abnormal noise reduction state, thereby triggering a subsequent abnormality handling process, and then regenerating the second inverted low-frequency signal, the noise reduction effect of the second inverted low-frequency signal is verified. When the fourth decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal in the detection area is replaced by the second inverted low-frequency signal. This signal replacement and update mechanism ensures that the most effective inverted low-frequency signal is always used for noise reduction, thereby optimizing the noise reduction performance.

[0014] Optionally, when the second difference is greater than the preset difference, it is determined that the first corrected inverted low-frequency signal is in an abnormal noise reduction state, specifically including: obtaining a target number of times, the target number of times the second difference appears cumulatively within a preset time; judging whether the target number of times is greater than the preset number of times; when the target number of times is greater than the preset number of times, it is determined that the first corrected inverted low-frequency signal is in an abnormal noise reduction state.

[0015] By adopting the above technical solution, since the noise level may fluctuate briefly due to various factors, causing the second difference to be occasionally greater than the preset difference, if the noise reduction abnormal state is judged based only on a single second difference, misjudgment may occur. Therefore, by counting the target number of times, misjudgment caused by accidental errors can be avoided, and the accuracy of abnormal judgment can be improved. When the target number of times is greater than the preset number of times, it means that within the preset time, the second difference has been greater than the preset difference for many times, which is more likely to reflect the continuous abnormality of the noise reduction effect rather than accidental fluctuations. Therefore, it can be determined that the first corrected inverted low-frequency signal is in the noise reduction abnormal state.

[0016] Optionally, when the second decibel value is less than the preset decibel value, after determining that the first corrected inverted low-frequency signal is in a normal noise reduction state, the method also includes: obtaining the current time point, calculating the interval duration between the current time point and the historical time point, the historical time point being the time point for determining that the detection area is subjected to noise reduction according to the first corrected inverted low-frequency signal; judging whether the interval duration is greater than or equal to the preset duration; when the interval duration is greater than or equal to the preset duration, determining that the first corrected inverted low-frequency signal is in an invalid state; re-obtaining the third environmental noise according to the invalid state, converting the third environmental noise to obtain a third low-frequency signal and a second corrected inverted low-frequency signal; performing initial neutralization on the second corrected inverted low-frequency signal and the third low-frequency signal to obtain a fifth decibel value; when the fifth decibel value is less than the preset decibel value, determining to replace the first corrected inverted low-frequency signal in the detection area with the second corrected inverted low-frequency signal, and performing noise reduction on the detection area according to the second corrected inverted low-frequency signal.

[0017] By adopting the above technical solution, the interval duration between the current time point and the historical time point is calculated, and the usage duration of the noise reduction signal can be actively monitored. When the interval duration is greater than or equal to the preset duration, it is automatically determined that the first corrected inverted low-frequency signal may be in an invalid state due to environmental changes, equipment aging, etc. After determining that the first corrected inverted low-frequency signal is invalid, the third environmental noise is re-acquired, and the third environmental noise is converted into a third low-frequency signal and a second corrected inverted low-frequency signal, and the third low-frequency signal is neutralized with the second corrected inverted low-frequency signal. When the fifth decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal in the detection area is replaced by the second corrected inverted low-frequency signal, and noise reduction is performed according to the second corrected inverted low-frequency signal. This dynamic replacement mechanism ensures continuous optimization of the noise reduction effect while avoiding resource waste caused by long-term use of the same signal.

[0018] Optionally, after determining whether the first decibel value is greater than or equal to the preset decibel value, the method also includes: when the first decibel value is less than the preset decibel value, determining that the first inverted low-frequency signal is in a normal noise reduction state, so as to perform noise reduction on the detection area according to the first inverted low-frequency signal.

[0019] By adopting the above technical solution and comparing the first decibel value with the preset decibel value, the noise reduction effect can be quantitatively evaluated in real time. This quantitative evaluation method is intuitive and accurate, and helps to timely understand the operating status of the noise reduction system. When the first decibel value is less than the preset decibel value, it is determined that the first inverted low-frequency signal is in a normal noise reduction state, which means that the currently used first inverted low-frequency signal can effectively offset the low-frequency components in the ambient noise, thereby achieving the expected noise reduction effect.

[0020] In a second aspect of the present application, a noise reduction device for a power supply with a sound pickup function is provided, the device comprising a receiving unit, a processing unit and a confirmation unit; the receiving unit receives a first environmental noise, the first environmental noise being obtained by using a target device to collect noise in a detection area; the processing unit converts the first environmental noise to obtain a first electrical signal; performs analog-to-digital conversion on the first electrical signal to obtain a first digital signal; obtains a first low-frequency signal from the first digital signal, obtains a first frequency and a first phase corresponding to the first low-frequency signal, and generates a first inverted low-frequency signal according to the first frequency and the first phase, the first inverted low-frequency signal having the same frequency as the first low-frequency signal and an opposite phase. inverted signal; after preliminarily neutralizing the first low-frequency signal and the first inverted low-frequency signal, obtain a first decibel value; determine whether the first decibel value is greater than or equal to a preset decibel value; when the first decibel value is greater than or equal to the preset decibel value, adjust the first inverted low-frequency signal according to the first decibel value to obtain a first corrected inverted low-frequency signal; after neutralizing the first corrected inverted low-frequency signal with the first low-frequency signal, obtain a second decibel value; determine whether the second decibel value is less than the preset decibel value; confirm the unit, when the second decibel value is less than the preset decibel value, determine that the first corrected inverted low-frequency signal is in a normal noise reduction state, so as to perform noise reduction on the detection area according to the first corrected inverted low-frequency signal.

[0021] Optionally, the processing unit is used to perform frequency domain analysis on the first digital signal to obtain a frequency domain signal; the receiving unit is used to obtain multiple signal components from the frequency domain signal, and obtain the frequencies corresponding to the multiple signal components; the processing unit is used to determine the second frequency corresponding to the first signal component, the first signal component being any one of the multiple signal components; and judge whether the second frequency is greater than or equal to a preset frequency; the confirmation unit is used to determine that the first signal component is included in the target set when the second frequency is less than the preset frequency, so as to obtain the first low-frequency signal from the target set; when the second frequency is greater than or equal to the preset frequency, determine that the first signal component is eliminated and obtain a third frequency corresponding to the second signal component, the second signal component being any one of the multiple signal components except the first signal component; and when the third frequency is less than the preset frequency, determine that the second signal component is included in the target set.

[0022] Optionally, the receiving unit is used to obtain a first difference, which is the difference between the first decibel value and the preset decibel value; the processing unit is used to input the first difference into a preset reference table for query to obtain an attenuation ratio; and the amplitude of the first inverted low-frequency signal is adjusted according to the attenuation ratio to obtain a first corrected inverted low-frequency signal.

[0023] Optionally, the receiving unit is used to obtain a third decibel value at a preset time interval; the processing unit is used to calculate the third decibel value and the preset decibel value to obtain a second difference; determine whether the second difference is greater than the preset difference; the confirmation unit is used to determine that the first corrected inverted low-frequency signal is in a noise reduction abnormal state when the second difference is greater than the preset difference; the receiving unit is used to re-acquire the second environmental noise collected by the target device according to the noise reduction abnormal state; the processing unit is used to convert the second environmental noise to obtain a second electrical signal; perform analog-to-digital conversion on the second electrical signal to obtain a second digital signal; obtain the second low-frequency signal from the second digital signal, obtain the fourth frequency and second phase corresponding to the second low-frequency signal, generate a second inverted low-frequency signal according to the fourth frequency and second phase, the second inverted low-frequency signal and the second low-frequency signal have the same frequency and opposite phase; obtain the fourth decibel value after initially neutralizing the second inverted low-frequency signal with the second low-frequency signal; determine whether the fourth decibel value is greater than or equal to the preset decibel value; The confirmation unit is used to determine to replace the first corrected inverted low-frequency signal in the detection area with the second inverted low-frequency signal when the fourth decibel value is less than the preset decibel value, so as to reduce noise in the detection area according to the second inverted low-frequency signal.

[0024] Optionally, the receiving unit is used to obtain a target number, which is the cumulative number of times the second difference value appears within a preset time; determine whether the target number is greater than the preset number; when the target number is greater than the preset number, determine that the first corrected inverted low-frequency signal is in an abnormal noise reduction state.

[0025] Optionally, the receiving unit is used to obtain the current time point, and the processing unit is used to calculate the interval duration between the current time point and the historical time point, the historical time point being the time point for determining the detection area to perform noise reduction according to the first corrected inverted low-frequency signal; judging whether the interval duration is greater than or equal to the preset duration; when the interval duration is greater than or equal to the preset duration, determining that the first corrected inverted low-frequency signal is in an invalid state; re-obtaining the third environmental noise according to the invalid state, converting the third environmental noise to obtain a third low-frequency signal and a second corrected inverted low-frequency signal; initially neutralizing the second corrected inverted low-frequency signal with the third low-frequency signal to obtain a fifth decibel value; the confirmation unit is used to determine that the first corrected inverted low-frequency signal in the detection area is replaced with the second corrected inverted low-frequency signal when the fifth decibel value is less than the preset decibel value, and performing noise reduction on the detection area according to the second corrected inverted low-frequency signal.

[0026] Optionally, the confirmation unit is used to determine that the first inverted low-frequency signal is in a normal noise reduction state when the first decibel value is less than a preset decibel value, so as to perform noise reduction on the detection area according to the first inverted low-frequency signal.

[0027] In a third aspect of the present application, an electronic device is provided, which includes a processor, a memory, a user interface and a network interface, the memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory, so that an electronic device executes any one of the methods described above in the present application.

[0028] In a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores instructions, and when the instructions are executed, any one of the above methods of the present application is executed.

[0029] In summary, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. First, the collected first environmental noise is converted into a first electrical signal, and then the first digital signal is obtained through analog-to-digital conversion. The first low-frequency signal is obtained from the first digital signal, and its corresponding first frequency and first phase are accurately obtained, which ensures the accurate analysis and processing of the noise signal and provides a basis for the subsequent generation of an accurate inverted low-frequency signal. After the generated first inverted low-frequency signal is preliminarily neutralized with the first low-frequency signal, a first decibel value is obtained, and it is determined whether the first decibel value is greater than or equal to the preset decibel value. The noise reduction effect can be preliminarily evaluated. If the first decibel value is still high, it means that the preliminarily generated inverted low-frequency signal may not be accurate enough or the strength is insufficient. When the first decibel value is greater than or equal to the preset decibel value, the noise reduction effect can be preliminarily evaluated according to the first decibel value. The first inverted low-frequency signal is adjusted by one decibel value to obtain a first corrected inverted low-frequency signal, and then the first corrected inverted low-frequency signal is neutralized with the first low-frequency signal to obtain a second decibel value again, and it is determined whether the second decibel value is less than the preset decibel value. Through this feedback adjustment mechanism, the inverted low-frequency signal can be continuously optimized so that it can be more accurately offset with the original low-frequency noise signal, thereby improving the noise reduction effect. When the second decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state, and the noise of the detection area is reduced according to the first corrected inverted low-frequency signal, which can significantly reduce the interference of noise on the pickup signal, thereby improving the accuracy of the test results of the power supply with pickup function in a complex acoustic environment.

[0030] 2. Perform frequency domain analysis on the first digital signal and convert the time domain signal into a frequency domain signal, which can clearly show the distribution of each frequency component in the signal, so that signal components of different frequencies can be accurately identified and distinguished. By setting a preset frequency, the signal components below the frequency are summarized into a target set, thereby achieving accurate extraction of low-frequency signals. Signal components greater than or equal to the preset frequency are eliminated, thereby removing the interference of high-frequency noise on the extraction of low-frequency signals. The low-frequency signals are summarized into the target set, and special noise reduction processing can be performed on these signals, such as generating an inverted low-frequency signal for neutralization. Targeted processing can more effectively reduce the intensity of low-frequency noise and improve the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of a noise reduction method for a power supply with a sound pickup function provided in an embodiment of the present application; Figure 2 This is a structural diagram of a noise reduction device for a power supply with a sound pickup function provided in an embodiment of the present application; Figure 3 This is a structural diagram of an electronic device disclosed in an embodiment of the present application.

[0032] Explanation of the reference numerals: 201, receiving unit; 202, processing unit; 203, confirmation unit; 300, electronic device; 301, processor; 302, memory; 303, user interface; 304, network interface; 305, communication bus. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0034] In the description of the embodiments of this application, words such as "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "for example" or "for instance" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "for example" or "for instance" is intended to present the relevant concepts in a concrete manner.

[0035] In the description of the embodiments of the present application, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0036] In the field of electronic product testing, the vibration and friction of various components in production workshops during operation generate acoustic signals with specific frequency characteristics. Power supply units equipped with sound pickup capabilities can capture these acoustic signals in real time. In-depth analysis of this collected sound data provides early insight into potential equipment failures, enabling rational maintenance plans and preventive maintenance. This effectively reduces disruption to production processes caused by sudden equipment failures and ensures continuous and stable production.

[0037] However, the acoustic environment of a production workshop is complex. Besides the effective acoustic signals generated by the vibration and friction of equipment components, it is also filled with various noises generated during equipment operation. These noises can intersect with the effective acoustic signals, distorting the sound signals collected by the sound pickup system. This inaccurately reflects the equipment's true operating status, potentially misleading assessments of equipment health and impacting the scientific and effective nature of equipment maintenance decisions. To suppress the interference of noise on the picked-up signals, sound insulation materials or passive noise reduction technologies can be used to absorb and attenuate the noise. However, the acoustic properties of sound insulation materials dictate their superior absorption of high-frequency noise. However, the noise energy generated by most noise sources in a production workshop is primarily concentrated in the low-frequency range. Sound insulation materials have poor absorption performance for low-frequency noise, making it difficult to effectively reduce its intensity. This can lead to skewed test results for power supplies with sound pickup in complex acoustic environments.

[0038] Therefore, how to solve the problem that sound insulation materials and passive noise reduction technology are not effective in suppressing low-frequency noise. The embodiment of the present application provides a noise reduction method for a power supply with a sound pickup function, which is applied to a monitoring platform. The monitoring platform of the present application can be a platform that provides noise reduction services for power supplies with a sound pickup function. Figure 1 This is a flow chart of a noise reduction method for a power supply with a sound pickup function provided by an embodiment of the present application, with reference to Figure 1 The method includes the following steps S101-S107.

[0039] S101: Receive first environmental noise, where the first environmental noise is obtained by using a target device to collect noise in a detection area; convert the first environmental noise to obtain a first electrical signal.

[0040] In the above S101, when reducing the noise in the detection area, a shielding device can be deployed in the detection area in advance, and the shielding device is used to reduce the noise generated in the production workshop. At this time, this shielding device is suitable for detecting a shielding device with a sound pickup function, and is used to shield the noise in the production workshop, so that the power supply with a sound pickup function is not disturbed by the production noise when testing the sound pickup function and forming a misjudgment. The mechanical structure of the shielding device of this embodiment includes a fully enclosed cabin structure of a ventilation device and a sound insulation layer, and also includes active noise reduction. The active noise reduction consists of four parts: an external noise collection device, a noise reduction calculation device, an inverse sound wave generating device, and an internal decibel monitor. First, the target device is installed on the outside of the shielding device, such as a microphone array or a noise sensor, and then the target device is used to collect noise in the detection area, that is, to collect the environmental noise outside the shielding device, and then obtain the first environmental noise.

[0041] For example, in a production workshop environment, a microphone array is used to collect sounds around the outside of the shielding device, including equipment operation sounds, people talking, component vibrations, and friction sounds, etc. These sounds are mixed together to form the first environmental noise.

[0042] Furthermore, after receiving the first ambient noise, the sensor can convert the first ambient noise into an analog electrical signal, i.e., the first electrical signal, through a conversion circuit within the sensor, such as a piezoelectric effect or electromagnetic induction. For example, the microphones in the microphone array convert sound vibrations into weak voltage changes. These voltage changes constitute the first electrical signal, whose amplitude and frequency correspond to the intensity and pitch of the sound.

[0043] S102: Perform analog-to-digital conversion on the first electrical signal to obtain a first digital signal.

[0044] In S102 above, after obtaining the first electrical signal, an analog-to-digital converter (ADC) is used to convert the first electrical signal into a digital signal, i.e., a first digital signal. The ADC samples and quantizes the analog electrical signal according to a certain sampling rate and quantization accuracy. For example, assuming a sampling rate of 44.1kHz and a quantization accuracy of 16 bits, the ADC samples the first electrical signal 44,100 times per second and quantizes the voltage value of each sample into a 16-bit digital value. These digital values ​​constitute the first digital signal.

[0045] S103: Obtain a first low-frequency signal from the first digital signal, obtain a first frequency and a first phase corresponding to the first low-frequency signal, and generate a first inverted low-frequency signal according to the first frequency and the first phase, wherein the first inverted low-frequency signal has the same frequency as the first low-frequency signal and an opposite phase.

[0046] In the above S103, after obtaining the first digital signal, the first digital signal is input into a noise reduction calculation device in the shielding device so that the noise reduction calculation device removes high-frequency signals and retains low-frequency signals. Obtaining a first low-frequency signal from the first digital signal specifically includes: performing frequency domain analysis on the first digital signal to obtain a frequency domain signal; obtaining multiple signal components from the frequency domain signal and obtaining frequencies corresponding to each of the multiple signal components; determining a second frequency corresponding to the first signal component, where the first signal component is any one of the multiple signal components; determining whether the second frequency is greater than or equal to a preset frequency; when the second frequency is less than the preset frequency, determining to include the first signal component in a target set, so as to obtain the first low-frequency signal from the target set; when the second frequency is greater than or equal to the preset frequency, determining to remove the first signal component and obtain a third frequency corresponding to the second signal component, where the second signal component is any one of the multiple signal components other than the first signal component; and when the third frequency is less than the preset frequency, determining to include the second signal component in the target set.

[0047] Specifically, a fast Fourier transform (FFT) or other frequency domain analysis algorithm is used to convert the first digital signal from the time domain to the frequency domain. After frequency domain analysis, a frequency domain signal is obtained, namely, the amplitude and phase information of the signal at different frequencies. For example, if the first digital signal is a mixed signal containing multiple frequency components, FFT processing produces a frequency domain signal, which displays the amplitude value corresponding to each frequency point on the frequency axis. Signal components at each frequency point are then extracted from the frequency domain signal, with each signal component corresponding to a frequency. For each signal component, its corresponding frequency value is recorded. For example, a frequency domain signal may contain multiple signal components with frequencies of 100 Hz, 200 Hz, 500 Hz, and 1000 Hz, and these frequency values ​​are recorded separately. One of the multiple signal components is then randomly selected as the first signal component. The frequency value corresponding to the first signal component is obtained, referred to as the second frequency. For example, if a signal component with a frequency of 100 Hz is selected as the first signal component, its second frequency is 100 Hz. A preset frequency is set based on application requirements to distinguish low-frequency from high-frequency signal components. The second frequency of the first signal component is compared with the preset frequency. For example, if the preset frequency is set to 500 Hz, the second frequency of the first signal component (100 Hz) is compared with 500 Hz. If the second frequency is less than the preset frequency, the first signal component is considered a low-frequency signal component. The low-frequency signal component is then included in the target set for subsequent low-frequency signal processing. If the second frequency is greater than or equal to the preset frequency, the first signal component is considered a high-frequency signal component and removed from the signal without further processing. Another signal component (i.e., the second signal component) is then selected from the remaining signal components, and its corresponding frequency value, referred to as the third frequency, is obtained. For example, suppose a signal component with a frequency of 1000 Hz is selected as the first signal component. Since 1000 Hz ≥ 500 Hz, it is removed. The next signal component is then selected, such as a signal component with a frequency of 200 Hz, whose third frequency is 200 Hz. For the second signal component, a determination is made as to whether its third frequency is less than the preset frequency. If so, the second signal component is included in the target set. Referring to the above-mentioned comparison method for the first signal component, similar processing is performed on multiple signal components, thereby eliminating the high-frequency signal components and retaining the low-frequency signal components. The low-frequency signal components are stored in the target set so that the first low-frequency signal can be subsequently obtained from the target set. At this time, the first low-frequency signal refers to a signal with a frequency lower than the preset frequency.

[0048] Furthermore, after obtaining the first low-frequency signal, a signal having the same frequency but opposite phase as the first low-frequency signal is generated based on the first frequency and first phase of the first low-frequency signal, i.e., a first inverted low-frequency signal. For example, if the first low-frequency signal is a sine wave with a frequency of 100 Hz and a phase of 0 degrees, then the first inverted low-frequency signal is a sine wave with a frequency of 100 Hz and a phase of 180 degrees.

[0049] S104: After preliminarily neutralizing the first low-frequency signal and the first inverted low-frequency signal, a first decibel value is obtained; and it is determined whether the first decibel value is greater than or equal to a preset decibel value.

[0050] In the above S104, after obtaining the first inverted low-frequency signal, the first low-frequency signal is superimposed with the first inverted low-frequency signal. In theory, since they have the same frequency and opposite phase, they cancel each other out after superposition. However, in reality, due to various factors, such as signal distortion and noise interference, the superimposed signal may not be completely zero. By calculating the amplitude of the superimposed signal and converting it into a distribution value, i.e., the first distribution value, the cancellation effect can be evaluated. It is also possible to directly use an internal decibel monitor to obtain the real-time decibel value inside the shielding device. After obtaining the first decibel value, the first decibel value is compared with the preset decibel value. The preset decibel value is a threshold value set according to the noise reduction requirements, indicating the desired noise reduction effect. For example, the first decibel value is 40dB, the preset decibel value is set to 30dB, and the first decibel value is then compared with the preset decibel value.

[0051] S105: When the first decibel value is greater than or equal to the preset decibel value, the first inverted low-frequency signal is adjusted according to the first decibel value to obtain a first corrected inverted low-frequency signal.

[0052] In the above S105, when the first decibel value is greater than or equal to the preset decibel value, it is determined that the first inverted low-frequency signal and the first low-frequency signal do not match each other and do not need to achieve a mutual cancellation effect. Therefore, the first inverted low-frequency signal needs to be adjusted according to the first decibel value to obtain a first corrected inverted low-frequency signal, specifically including: obtaining a first difference, where the first difference is the difference between the first decibel value and the preset decibel value; inputting the first difference into a preset reference table for query to obtain an attenuation ratio; and adjusting the amplitude of the first inverted low-frequency signal according to the attenuation ratio to obtain a first corrected inverted low-frequency signal.

[0053] Specifically, the first decibel value (the decibel value of the noise remaining after the current noise reduction) is subtracted from the preset decibel value (the desired noise reduction target decibel value) to obtain a first difference. This first difference only exists when the first decibel value is greater than the preset decibel value. For example, if the first decibel value is 40dB and the preset decibel value is 30dB, the first difference is 10dB. A preset reference table is then constructed in advance. This table, based on extensive experimentation and testing, summarizes the amplitude attenuation ratios corresponding to different decibel differences for shielding devices and common low-frequency noise environments, thus forming a reference table. The preset reference table is a predefined mapping relationship used to map decibel differences to corresponding attenuation ratios. The attenuation ratio represents the multiple by which the amplitude of the first inverted low-frequency signal is adjusted. According to the first difference, the corresponding attenuation ratio is searched in the preset reference table. For example, in the preset reference table, when the decibel difference is 0-5dB, the attenuation ratio is 1.0, when the decibel difference is 6-10dB, the attenuation ratio is 1.2, and when the decibel difference is 11-15dB, the attenuation ratio is 1.5. According to the first difference of 10dB, the corresponding attenuation ratio is 1.2 found in the preset reference table. Then multiply the amplitude of the first inverted low-frequency signal by the attenuation comparison to obtain the adjusted amplitude, and then use the adjusted amplitude to generate the first corrected inverted low-frequency signal. At this time, the frequency of the first corrected inverted low-frequency signal is the same as that of the first low-frequency signal, but the phase is opposite to that of the first low-frequency signal. It can ensure that the shielding device can adaptively adjust the parameters in different noise environments to achieve the best noise reduction effect.

[0054] Furthermore, when the first decibel value is less than a preset decibel value, the first inverted low-frequency signal is determined to be in a normal noise reduction state, so that noise reduction can be performed in the detection area according to the first inverted low-frequency signal. Specifically, when the first decibel value is less than the preset decibel value, it indicates that the current noise level is lower than the expected level and the first inverted low-frequency signal is effectively offsetting the noise. Therefore, the first inverted low-frequency signal is determined to be in a normal noise reduction state, so that the inverted sound wave generating device can subsequently generate an inverted sound wave of a fixed amplitude according to the first inverted low-frequency signal to neutralize the noise, thereby achieving the effect of noise reduction in the detection area.

[0055] S106: After neutralizing the first corrected inverted low-frequency signal and the first low-frequency signal, a second decibel value is obtained; and it is determined whether the second decibel value is less than a preset decibel value.

[0056] In S106, the first corrected directional low-frequency signal is then superimposed on the first low-frequency signal. After superposition, an internal decibel monitor can be used to monitor the decibel value inside the shielding device in real time, i.e., the second decibel value. The second decibel value is then compared with the preset decibel value to determine whether the first corrected inverted low-frequency signal can effectively offset the first low-frequency signal, thereby achieving the desired noise reduction effect.

[0057] S107: When the second decibel value is less than the preset decibel value, determine that the first corrected inverted low-frequency signal is in a normal noise reduction state, so as to perform noise reduction on the detection area according to the first corrected inverted low-frequency signal.

[0058] In the above S107, when the second decibel value is less than the preset decibel value, it means that the first corrected inverted low-frequency signal can effectively offset the first low-frequency signal and achieve the expected noise reduction effect. Therefore, it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state, and the detection area can be continuously noise-reduced according to the first corrected inverted low-frequency signal, that is, the inverted sound wave generating device generates an inverted sound wave of a fixed amplitude according to the first corrected inverted low-frequency signal to neutralize the first low-frequency signal, thereby achieving the effect of active noise reduction. For example, when the second decibel value is 25dB and the preset decibel value is 30dB, the second decibel value is less than the preset decibel value at this time, so it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state.

[0059] In addition, when the second decibel value is greater than or equal to the preset decibel value, the attenuation ratio is continued to be determined based on the difference between the second decibel value and the preset decibel value, and the first corrected inverted low-frequency signal is readjusted based on the attenuation ratio to obtain the final inverted low-frequency signal. The final inverted low-frequency signal is then neutralized with the first low-frequency signal, and the decibel value is obtained again, and then the decibel value is compared with the preset decibel value. Only when the decibel value is less than the preset decibel value, can it be determined that the final inverted low-frequency signal will be output as a fixed low-frequency signal.

[0060] In one possible implementation, the noise reduction effect can be dynamically monitored, and when the noise reduction is abnormal, the noise can be re-adopted to generate a new inverted low-frequency signal, and the optimal noise reduction signal can be selected according to the new noise reduction effect, specifically including: obtaining a third decibel value at a preset time interval; calculating the third decibel value and the preset decibel value to obtain a second difference; judging whether the second difference is greater than the preset difference; when the second difference is greater than the preset difference, determining that the first corrected inverted low-frequency signal is in a noise reduction abnormal state; re-obtaining the second environmental noise collected by the target device according to the noise reduction abnormal state; converting the second environmental noise to obtain a second electrical signal; performing analog-to-digital conversion on the second electrical signal. , obtaining a second digital signal; obtaining a second low-frequency signal from the second digital signal, obtaining a fourth frequency and a second phase corresponding to the second low-frequency signal, generating a second inverted low-frequency signal according to the fourth frequency and the second phase, wherein the second inverted low-frequency signal and the second low-frequency signal have the same frequency and opposite phase; after initially neutralizing the second inverted low-frequency signal with the second low-frequency signal, obtaining a fourth decibel value; determining whether the fourth decibel value is greater than or equal to a preset decibel value; when the fourth decibel value is less than the preset decibel value, determining to replace the first corrected inverted low-frequency signal in the detection area with the second inverted low-frequency signal, so as to perform noise reduction on the detection area according to the second inverted low-frequency signal.

[0061] Specifically, a time interval can be set based on the monitoring needs of the production workshop, such as 30 minutes or 1 hour. At the end of each time interval, the decibel monitor in the shielding device is used to obtain a third decibel value, and then the third decibel value is calculated with the preset decibel value to obtain a second difference. The difference may be positive or negative. A positive value indicates that the current low-frequency noise needs to be attenuated, and a negative value indicates that the current low-frequency noise does not need to be attenuated. This embodiment only focuses on the case where the second difference is positive. Then, it is determined whether the second difference is greater than the preset difference. The preset difference is used to determine whether the current noise level exceeds the range that needs to be attenuated. For example, if the second difference is 12dB, if the preset difference is set to 10dB, the second difference is greater than the preset difference. When the second difference is greater than the preset difference, it means that the current noise reduction effect is not ideal, and the first corrected inverted low-frequency signal may not be able to effectively offset the noise. This may be due to changes in the external environmental noise. Therefore, the current first corrected inverted low-frequency signal cannot meet the noise reduction requirements, so the first corrected inverted low-frequency signal is marked as a noise reduction abnormal state. Because the first corrected inverted low-frequency signal is abnormal, it is necessary to re-collect noise outside the shielding device to obtain the second ambient noise. A microphone can be used to re-collect the noise in the detection area. The sensor's internal conversion circuit then converts the second ambient noise into an analog electrical signal, the second electrical signal. An analog-to-digital converter (ADC) then converts the second electrical signal into a digital signal, the second digital signal. Frequency domain analysis is then performed on the second digital signal to extract the low-frequency components and remove the high-frequency components. The fourth frequency and second phase corresponding to the second low-frequency signal are then obtained. Based on the fourth frequency and second phase, a signal with the same frequency but opposite phase is generated, the second inverted low-frequency signal. For example, if the second low-frequency signal has a frequency of 150 Hz and a phase of 20 degrees, the resulting second inverted low-frequency signal has a frequency of 150 Hz and a phase of 200 degrees. The second inverted low-frequency signal is then superimposed with the second low-frequency signal, theoretically canceling each other out. After this superposition, a decibel monitor is used to obtain a fourth decibel value within the shielding device. The fourth decibel value is then determined to be less than a preset decibel value. If the fourth decibel value is less than the preset decibel value, the noise reduction effect of the second inverted low-frequency signal matches the current second ambient noise level. Therefore, the first corrected inverted low-frequency signal is replaced with the second inverted low-frequency signal. This means that the inverted sound wave generator is controlled to generate an inverted sound wave with a fixed amplitude using the second inverted low-frequency signal to neutralize the second low-frequency signal, achieving the desired noise reduction effect. This ensures that the shielding device can adaptively adjust parameters to achieve optimal noise reduction in varying noise environments. If the second difference is less than or equal to the preset difference, no further adjustments are required to the first corrected inverted low-frequency signal, and noise reduction continues according to the first corrected inverted low-frequency signal.

[0062] In addition, in a production workshop environment, occasional decibel fluctuations may be caused by some short-term and non-repeatable factors, such as the moment of equipment startup, temporary movement of personnel, etc. The decibel fluctuations caused by these factors may not have a long-term impact on the overall noise reduction effect and the equipment detection environment. Therefore, by monitoring the number of times the fluctuation amplitude occurs, once the number of times the fluctuation amplitude occurs is large, it may mean that the external environment or the equipment operating status has undergone a relatively continuous change, and the noise reduction process needs to be readjusted to adapt to the new situation. When the second difference is greater than the preset difference, it is determined that the first corrected inverted low-frequency signal is in an abnormal noise reduction state, specifically including: obtaining the target number, the target number is the cumulative number of times the second difference appears within the preset time; judging whether the target number is greater than the preset number; when the target number is greater than the preset number, it is determined that the first corrected inverted low-frequency signal is in an abnormal noise reduction state.

[0063] Specifically, after determining that the second difference is greater than the preset difference, a time range can be determined, such as 3 hours, 5 hours, and 6 hours, to count the number of times the second difference occurs within this time range. Within the time range, the second difference obtained by each calculation is continuously monitored and recorded. Whenever the second difference is greater than the preset difference, the target number is increased by 1. For example, the preset time is 3 hours, the preset difference is 10dB, and within 3 hours, 6 decibel monitorings are performed. The decibel differences obtained after the 6 calculations are 6dB, 8dB, 12dB, 11dB, 13dB, and 12dB respectively. According to the preset difference of 10dB, only the second differences of 12dB, 11dB, 13dB, and 12dB are counted in the target number, so the target number is 4 times. The target number is then compared with the preset number. The preset number is determined based on demand and noise reduction requirements, and the preset number can be set to 3 times. If the target number of occurrences exceeds the preset number, it indicates that the second difference has exceeded the preset difference multiple times within the preset time window, indicating that the current noise reduction effect is unsatisfactory and the first corrected inverted low-frequency signal may not be able to effectively offset the noise. The first corrected inverted low-frequency signal is marked as being in an abnormal noise reduction state. Based on the cumulative number of occurrences of the second difference within the preset time, it can be dynamically determined whether the first corrected inverted low-frequency signal is in an abnormal noise reduction state. If the target number of occurrences is less than the preset number, the first corrected inverted low-frequency signal is determined to be in a normal noise reduction state.

[0064] In one possible implementation, it is possible to dynamically determine whether the first corrected inverted low-frequency signal is invalid based on a time interval, and when invalid, re-collect noise, generate a new inverted low-frequency signal, and select the optimal noise reduction signal based on the new noise reduction effect, specifically including: obtaining a current time point, calculating the interval between the current time point and a historical time point, the historical time point being the time point for determining the detection area to perform noise reduction according to the first corrected inverted low-frequency signal; determining whether the interval is greater than or equal to a preset time; when the interval is greater than or equal to the preset time, determining that the first corrected inverted low-frequency signal is in an invalid state; re-acquiring a third environmental noise based on the invalid state, converting the third environmental noise to obtain a third low-frequency signal and a second corrected inverted low-frequency signal; performing initial neutralization on the second corrected inverted low-frequency signal and the third low-frequency signal to obtain a fifth decibel value; when the fifth decibel value is less than the preset decibel value, determining to replace the first corrected inverted low-frequency signal in the detection area with the second corrected inverted low-frequency signal, and performing noise reduction on the detection area according to the second corrected inverted low-frequency signal.

[0065] Specifically, the current time point can be obtained through a clock or timer, and the historical time point is determined. The historical time point is the time point when the monitoring area first or most recently performs noise reduction according to the first corrected inverted low-frequency signal. Then use the current time point to subtract the historical time point to obtain the interval duration. For example, the current time point is 14:30:00, the historical time point is 8:30:00, and the interval duration is 5 hours. Then compare the interval duration with the preset duration. The preset duration is set according to the production workshop equipment operation requirements and the noise reduction effect maintenance time, such as 12 hours. When the interval duration is greater than or equal to the preset duration, it is determined that the first corrected inverted low-frequency signal cannot effectively offset the noise, that is, it is in an invalid state. Mark the first corrected inverted low-frequency signal as an invalid state. Because the first corrected inverted low-frequency signal is ineffective, the noise in the detection area needs to be re-sampled to obtain the third ambient noise. This third ambient noise is then converted into an analog electrical signal, which is then converted to a digital signal. The low-frequency component of the digital signal is extracted to obtain the third low-frequency signal. Based on the frequency and phase of the third low-frequency signal, a second corrected inverted low-frequency signal with the same frequency and opposite phase is generated. The second corrected inverted low-frequency signal is superimposed (added) with the third low-frequency signal, which theoretically should cancel each other out. After superposition, a decibel meter is used to obtain a fifth decibel value to evaluate the noise reduction effect. If the fifth decibel value is less than the preset decibel value, the noise reduction effect of the second corrected inverted low-frequency signal is sufficient for the current third ambient noise. Therefore, the first corrected inverted low-frequency signal needs to be removed, and the second corrected inverted low-frequency signal is used to reduce the noise in the detection area. Therefore, the second corrected inverted low-frequency signal is applied to the inverted sound wave generator, which generates an inverted sound wave of a fixed amplitude based on the second corrected inverted low-frequency signal to neutralize the noise, thereby achieving the noise reduction effect. Through the above method, it is possible to ensure that the shielding device can adaptively adjust parameters at different time points to maintain the best noise reduction effect.

[0066] The embodiment of the present application also provides a noise reduction device for a power supply with a sound pickup function, Figure 2 This is a structural diagram of a noise reduction device with a sound pickup function power supply provided by an embodiment of the present application, with reference to Figure 2 The device includes a receiving unit 201, a processing unit 202 and a confirmation unit 203.

[0067] The receiving unit 201 receives first environmental noise, where the first environmental noise is obtained by using a target device to collect noise in a detection area.

[0068] The processing unit 202 converts the first environmental noise to obtain a first electrical signal; performs analog-to-digital conversion on the first electrical signal to obtain a first digital signal; obtains a first low-frequency signal from the first digital signal, obtains a first frequency and a first phase corresponding to the first low-frequency signal, and generates a first inverted low-frequency signal according to the first frequency and the first phase, wherein the first inverted low-frequency signal and the first low-frequency signal have the same frequency and opposite phase; obtains a first decibel value after preliminarily neutralizing the first low-frequency signal and the first inverted low-frequency signal; determines whether the first decibel value is greater than or equal to a preset decibel value; when the first decibel value is greater than or equal to the preset decibel value, adjusts the first inverted low-frequency signal according to the first decibel value to obtain a first corrected inverted low-frequency signal; obtains a second decibel value after neutralizing the first corrected inverted low-frequency signal with the first low-frequency signal; and determines whether the second decibel value is less than the preset decibel value.

[0069] The confirmation unit 203 determines that the first corrected inverted low-frequency signal is in a normal noise reduction state when the second decibel value is less than the preset decibel value, so as to perform noise reduction on the detection area according to the first corrected inverted low-frequency signal.

[0070] In one possible embodiment, the processing unit 202 is used to perform frequency domain analysis on the first digital signal to obtain a frequency domain signal; the receiving unit 201 is used to obtain multiple signal components from the frequency domain signal and obtain the frequencies corresponding to the multiple signal components; the processing unit 202 is used to determine the second frequency corresponding to the first signal component, where the first signal component is any one of the multiple signal components; and determine whether the second frequency is greater than or equal to a preset frequency; the confirmation unit 203 is used to determine, when the second frequency is less than the preset frequency, that the first signal component is included in the target set so as to obtain the first low-frequency signal from the target set; when the second frequency is greater than or equal to the preset frequency, determine to eliminate the first signal component and obtain a third frequency corresponding to the second signal component, where the second signal component is any one of the multiple signal components except the first signal component; and when the third frequency is less than the preset frequency, determine to include the second signal component in the target set.

[0071] In one possible embodiment, the receiving unit 201 is used to obtain a first difference, which is the difference between the first decibel value and the preset decibel value; the processing unit 202 is used to input the first difference into a preset reference table for query to obtain an attenuation ratio; and the amplitude of the first inverted low-frequency signal is adjusted according to the attenuation ratio to obtain a first corrected inverted low-frequency signal.

[0072] In one possible embodiment, the receiving unit 201 is used to obtain a third decibel value at an interval of a preset time; the processing unit 202 is used to calculate the third decibel value and the preset decibel value to obtain a second difference; determine whether the second difference is greater than the preset difference; the confirmation unit 203 is used to determine that the first corrected inverted low-frequency signal is in a noise reduction abnormal state when the second difference is greater than the preset difference; the receiving unit 201 is used to re-acquire the second environmental noise collected by the target device according to the noise reduction abnormal state; the processing unit 202 is used to convert the second environmental noise to obtain a second electrical signal; perform analog-to-digital conversion on the second electrical signal to obtain a second digital signal; and A second low-frequency signal is obtained from the digital signal, a fourth frequency and a second phase corresponding to the second low-frequency signal are obtained, and a second inverted low-frequency signal is generated according to the fourth frequency and the second phase, wherein the second inverted low-frequency signal and the second low-frequency signal have the same frequency and opposite phase; after initially neutralizing the second inverted low-frequency signal with the second low-frequency signal, a fourth decibel value is obtained; and it is determined whether the fourth decibel value is greater than or equal to a preset decibel value; the confirmation unit 203 is used to determine that the first corrected inverted low-frequency signal in the detection area is replaced with the second inverted low-frequency signal when the fourth decibel value is less than the preset decibel value, so as to perform noise reduction on the detection area according to the second inverted low-frequency signal.

[0073] In one possible embodiment, the receiving unit 201 is used to obtain a target number of times, which is the cumulative number of times the second difference value appears within a preset time; determine whether the target number of times is greater than the preset number of times; when the target number of times is greater than the preset number of times, determine that the first corrected inverted low-frequency signal is in an abnormal noise reduction state.

[0074] In one possible embodiment, the receiving unit 201 is used to obtain the current time point, and the processing unit 202 is used to calculate the interval duration between the current time point and the historical time point, the historical time point being the time point for determining the detection area to perform noise reduction according to the first corrected inverted low-frequency signal; judging whether the interval duration is greater than or equal to the preset duration; when the interval duration is greater than or equal to the preset duration, determining that the first corrected inverted low-frequency signal is in an invalid state; reacquiring the third environmental noise according to the invalid state, converting the third environmental noise to obtain a third low-frequency signal and a second corrected inverted low-frequency signal; performing initial neutralization on the second corrected inverted low-frequency signal and the third low-frequency signal to obtain a fifth decibel value; the confirmation unit 203 is used to determine that the first corrected inverted low-frequency signal in the detection area is replaced with the second corrected inverted low-frequency signal when the fifth decibel value is less than the preset decibel value, and performing noise reduction on the detection area according to the second corrected inverted low-frequency signal.

[0075] In a possible implementation, the confirmation unit 203 is configured to determine that the first inverted low-frequency signal is in a normal noise reduction state when the first decibel value is less than a preset decibel value, so as to perform noise reduction on the detection area according to the first inverted low-frequency signal.

[0076] It should be noted that the above embodiments provide devices that implement their functions using only the division of the above functional modules as examples. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiments are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0077] This application also discloses an electronic device. Figure 3 , Figure 3 The electronic device 300 may include: at least one processor 301 , at least one network interface 304 , a user interface 303 , a memory 302 , and at least one communication bus 305 .

[0078] The communication bus 305 is used to realize the connection and communication between these components.

[0079] The user interface 303 may include a display screen (Display) and a camera (Camera). Optionally, the user interface 303 may also include a standard wired interface and a wireless interface.

[0080] The network interface 304 may optionally include a standard wired interface or a wireless interface (such as a WI-FI interface).

[0081] The processor 301 may include one or more processing cores. Using various interfaces and circuits, the processor 301 connects to various components within the server. It executes instructions, programs, code sets, or instruction sets stored in the memory 302, as well as accesses data stored in the memory 302, to perform various server functions and process data. Optionally, the processor 301 may be implemented using at least one of the following hardware forms: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 301 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily processes the operating system, user interface, and application requests; the GPU is responsible for rendering and drawing content displayed on the display screen; and the modem handles wireless communications. It is understood that the modem may also be implemented independently of the processor 301 and implemented as a separate chip.

[0082] Memory 302 may include random access memory (RAM) or read-only memory (ROM). Optionally, memory 302 may include non-transitory computer-readable storage medium. Memory 302 may be used to store instructions, programs, codes, code sets, or instruction sets. Memory 302 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the aforementioned method embodiments, and the data storage area may store data involved in the aforementioned method embodiments. Memory 302 may also optionally be at least one storage device located remotely from the aforementioned processor 301.

[0083] like Figure 3 As shown, the memory 302 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an application program based on mobile phone-based temperature anomaly monitoring.

[0084] exist Figure 3In the electronic device 300 shown, the user interface 303 is mainly used to provide an input interface for the user and obtain data input by the user; and the processor 301 can be used to call the application program based on mobile phone temperature anomaly monitoring stored in the memory 302. When executed by one or more processors, the electronic device executes one or more methods in the above embodiments.

[0085] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for this application.

[0086] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of units, which is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interface, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0088] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0089] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0090] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of this application, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of this application. The aforementioned memory includes various media that can store program code, such as USB flash drives, mobile hard drives, magnetic disks, or optical disks.

[0091] The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the field of the present technology that are not recorded in the present disclosure.

Claims

1. A noise reduction method for a power supply with a sound pickup function, characterized in that: The method comprises: receiving a first environmental noise, where the first environmental noise is obtained by collecting noise in a detection area using a target device; converting the first environmental noise to obtain a first electrical signal; Performing analog-to-digital conversion on the first electrical signal to obtain a first digital signal; Obtaining a first low-frequency signal from the first digital signal, obtaining a first frequency and a first phase corresponding to the first low-frequency signal, and generating a first inverted low-frequency signal according to the first frequency and the first phase, wherein the first inverted low-frequency signal and the first low-frequency signal have the same frequency and opposite phase; After preliminarily neutralizing the first low-frequency signal and the first inverted low-frequency signal, a first decibel value is obtained; Determining whether the first decibel value is greater than or equal to a preset decibel value; When the first decibel value is greater than or equal to the preset decibel value, adjusting the first inverted low-frequency signal according to the first decibel value to obtain a first corrected inverted low-frequency signal; After neutralizing the first corrected inverted low-frequency signal and the first low-frequency signal, a second decibel value is obtained; Determining whether the second decibel value is less than the preset decibel value; When the second decibel value is less than the preset decibel value, it is determined that the first corrected inverted low-frequency signal is in a normal noise reduction state, so that noise reduction is performed on the detection area according to the first corrected inverted low-frequency signal.

2. The method according to claim 1, characterized in that The obtaining of the first low-frequency signal from the first digital signal specifically includes: Performing frequency domain analysis on the first digital signal to obtain a frequency domain signal; Acquire multiple signal components from the frequency domain signal, and acquire frequencies corresponding to the multiple signal components; determining a second frequency corresponding to a first signal component, where the first signal component is any one of the plurality of signal components; Determining whether the second frequency is greater than or equal to a preset frequency; When the second frequency is less than the preset frequency, determining to include the first signal component in a target set, so as to obtain the first low-frequency signal from the target set; When the second frequency is greater than or equal to the preset frequency, determining to remove the first signal component and obtaining a third frequency corresponding to the second signal component, where the second signal component is any one of the plurality of signal components except the first signal component; When the third frequency is less than the preset frequency, it is determined to include the second signal component in the target set.

3. The method according to claim 1, characterized in that The adjusting the first inverted low-frequency signal according to the first decibel value to obtain a first corrected inverted low-frequency signal specifically includes: Obtaining a first difference value, where the first difference value is a difference between the first decibel value and the preset decibel value; Inputting the first difference into a preset reference table for query to obtain an attenuation ratio; The amplitude of the first inverted low-frequency signal is adjusted according to the attenuation ratio to obtain the first corrected inverted low-frequency signal.

4. The method according to claim 3, characterized in that After determining that the first corrected inverted low-frequency signal is in a normal noise reduction state when the second decibel value is less than the preset decibel value, the method further includes: After a preset time interval, obtain the third decibel value; Calculating the third decibel value and the preset decibel value to obtain a second difference; Determining whether the second difference is greater than a preset difference; When the second difference is greater than the preset difference, determining that the first corrected inverted low-frequency signal is in a noise reduction abnormal state; reacquiring the second environmental noise collected by the target device according to the abnormal state of noise reduction; converting the second environmental noise to obtain a second electrical signal; performing analog-to-digital conversion on the second electrical signal to obtain a second digital signal; Obtaining a second low-frequency signal from the second digital signal, obtaining a fourth frequency and a second phase corresponding to the second low-frequency signal, and generating a second inverted low-frequency signal according to the fourth frequency and the second phase, wherein the second inverted low-frequency signal and the second low-frequency signal have the same frequency and opposite phase; After initially neutralizing the second inverted low-frequency signal and the second low-frequency signal, a fourth decibel value is obtained; Determining whether the fourth decibel value is greater than or equal to the preset decibel value; When the fourth decibel value is less than the preset decibel value, it is determined to replace the first corrected inverted low-frequency signal in the detection area with the second inverted low-frequency signal, so as to perform noise reduction on the detection area according to the second inverted low-frequency signal.

5. The method according to claim 4, characterized in that When the second difference is greater than the preset difference, determining that the first corrected inverted low-frequency signal is in a noise reduction abnormal state specifically includes: Obtaining a target number of times, where the target number of times the second difference value appears cumulatively within a preset time; Determining whether the target number of times is greater than a preset number of times; When the target number is greater than the preset number, it is determined that the first corrected inverted low-frequency signal is in the noise reduction abnormal state.

6. The method according to claim 3, characterized in that After determining that the first corrected inverted low-frequency signal is in a normal noise reduction state when the second decibel value is less than the preset decibel value, the method further includes: Obtaining a current time point, and calculating an interval between the current time point and a historical time point, wherein the historical time point is a time point at which noise reduction is performed on the detection area according to the first corrected inverted low-frequency signal; Determine whether the interval duration is greater than or equal to a preset duration; When the interval duration is greater than or equal to the preset duration, determining that the first corrected inverted low-frequency signal is in an invalid state; reacquire the third environmental noise according to the failure state, convert the third environmental noise to obtain a third low-frequency signal and a second corrected inverted low-frequency signal; Initially neutralizing the second corrected inverted low-frequency signal and the third low-frequency signal to obtain a fifth decibel value; When the fifth decibel value is less than a preset decibel value, it is determined to replace the first corrected inverted low-frequency signal in the detection area with the second corrected inverted low-frequency signal, and perform noise reduction on the detection area according to the second corrected inverted low-frequency signal.

7. The method according to claim 1, characterized in that After determining whether the first decibel value is greater than or equal to a preset decibel value, the method further includes: When the first decibel value is less than the preset decibel value, it is determined that the inverted low-frequency signal is in a normal noise reduction state, so that noise reduction is performed on the detection area according to the first inverted low-frequency signal.

8. A noise reduction device for a power supply with a sound pickup function, characterized in that: The device comprises a receiving unit (201), a processing unit (202) and a confirmation unit (203); The receiving unit (201) receives a first environmental noise, where the first environmental noise is obtained by collecting noise in a detection area using a target device; The processing unit (202) converts the first environmental noise to obtain a first electrical signal; performs analog-to-digital conversion on the first electrical signal to obtain a first digital signal; obtains a first low-frequency signal from the first digital signal, obtains a first frequency and a first phase corresponding to the first low-frequency signal, and generates a first inverted low-frequency signal according to the first frequency and the first phase, wherein the first inverted low-frequency signal and the first low-frequency signal have the same frequency and opposite phase; obtains a first decibel value after preliminarily neutralizing the first low-frequency signal and the first inverted low-frequency signal; and determines whether the first decibel value is greater than or equal to a preset decibel value. When the first decibel value is greater than or equal to the preset decibel value, adjusting the first inverted low-frequency signal according to the first decibel value to obtain a first corrected inverted low-frequency signal; neutralizing the first corrected inverted low-frequency signal with the first low-frequency signal to obtain a second decibel value; and determining whether the second decibel value is less than the preset decibel value; The confirmation unit (203) determines that the first corrected inverted low-frequency signal is in a normal noise reduction state when the second decibel value is less than the preset decibel value, so as to perform noise reduction on the detection area according to the first corrected inverted low-frequency signal.

9. An electronic device, characterized in that: The electronic device (300) comprises a processor (301), a memory (302), a user interface (303) and a network interface (304), wherein the memory (302) is used to store instructions, the user interface (303) and the network interface (304) are used to communicate with other devices, and the processor (301) is used to execute the instructions stored in the memory (302) so that the electronic device (300) executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores instructions, and when the instructions are executed, the method according to any one of claims 1 to 7 is executed.

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