Noise reduction device and electronic equipment

Abstract

The invention provides a noise reduction device and electronic equipment. The method can be used in the technical field of noise reduction. The noise reduction device is characterized in that a noise receiving unit is electrically connected with a noise processing unit, and the noise processing unit is electrically connected with a sound production unit; the noise receiving unit is used for collecting environmental noise around the receiver and sending the environmental noise to the noise processing unit; the noise processing unit is used for carrying out anti-phase processing on the environment noise to obtain reverse sound waves and sending the reverse sound waves to the sound production unit; and the sound production unit is used for outputting reverse sound waves, and the sound output direction of the sound production unit is different from the sound output direction of the receiver. In this way, a mute area can be formed near the auricle, and the effect of reducing noise is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of noise reduction, and in particular to a noise reduction device and an electronic device. Background Art

[0002] In life, people often use mobile phones to make calls in noisy environments, such as public transportation, streets, and busy shopping malls. However, the volume of the mobile phone receiver is relatively small, and users have difficulty hearing the call content in a noisy environment, resulting in reduced call quality. Therefore, there is an urgent need for a method that can effectively improve call quality in a noisy environment.

[0003] At present, in order to deal with this problem, some manufacturers have designed a high-volume mode for the earpiece. By increasing the loudness of the earpiece, the impact of environmental noise on users is reduced, thereby improving call quality.

[0004] However, the high volume mode of the handset causes long-term loud calls close to the ear, which will make the ear uncomfortable and affect hearing. In addition, in a noisy environment, the content of the call is not clear and the hearing of the ear will be seriously damaged. Summary of the invention

[0005] The present application provides a noise reduction device and an electronic device, which are used to solve the problem that the noise reduction effect of the existing earpiece in a high-volume mode is poor.

[0006] In one aspect, the present application provides a noise reduction device, comprising: a noise receiving unit, a noise processing unit and a sound generating unit, wherein:

[0007] The noise receiving unit is electrically connected to the noise processing unit, and the noise processing unit is electrically connected to the sound generating unit;

[0008] A noise receiving unit, used to collect the ambient noise around the earpiece and send the ambient noise to the noise processing unit;

[0009] A noise processing unit, used for performing inverse phase processing on the ambient noise to obtain a reverse sound wave, and sending the reverse sound wave to the sound generating unit;

[0010] The sound-emitting unit is used to output reverse sound waves. The sound output direction of the sound-emitting unit is different from that of the earpiece.

[0011] In a possible implementation, the sound emission direction of the sound emitting unit is opposite to the sound emission direction of the earpiece.

[0012] In a possible implementation, the sound-emitting unit is disposed behind the sound outlet of the earpiece.

[0013] In a possible implementation, the noise receiving unit includes a microphone, and the microphone is disposed close to the earpiece.

[0014] In a possible implementation, the microphone is disposed on the back of the earpiece.

[0015] In a possible implementation manner, the microphone includes a first microphone and a second microphone.

[0016] In a possible implementation manner, the first microphone and the second microphone are symmetrically arranged on two sides of the sound generating unit.

[0017] In a possible implementation, the noise processing unit includes a comparator and an inverter, wherein:

[0018] One input terminal of the comparator is used to input environmental noise, and the other input terminal of the comparator is used to input a noise threshold. The comparator is used to output an activation signal for inputting a sound unit through an output terminal when the environmental noise is greater than or equal to the noise threshold.

[0019] The inverter is electrically connected to the noise receiving unit and the sound generating unit. The inverter is used to perform inverse phase processing on the environmental noise to obtain a reverse sound wave, and send the reverse sound wave to the sound generating unit.

[0020] On the other hand, an embodiment of the present application provides an electronic device, including a device body, wherein the device body is provided with an earpiece and a noise reduction device as claimed in any one of claims 1 to 8.

[0021] In a possible implementation, it includes a mobile phone, a headset, and a true wireless stereo TWS headset.

[0022] The noise reduction device and electronic device provided in the embodiments of the present application are electrically connected through a noise receiving unit and a noise processing unit, and the noise processing unit is electrically connected to a sound emitting unit; the noise receiving unit is used to collect the ambient noise around the earpiece and send the ambient noise to the noise processing unit; the noise processing unit is used to perform anti-phase processing on the ambient noise to obtain a reverse sound wave, and send the reverse sound wave to the sound emitting unit; the sound emitting unit is used to output the reverse sound wave, and the sound emitting direction of the sound emitting unit is different from that of the earpiece, so that in a noisy environment, the ambient noise can be collected and processed, and the processed reverse sound wave is output by the sound emitting unit, thereby forming a quiet area near the user's auricle to achieve the effect of reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 A front view of the noise reduction device provided in an embodiment of the present application;

[0025] Figure 2A back view of the noise reduction device provided in an embodiment of the present application;

[0026] Figure 3 A relative position diagram of another noise receiving unit provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of a noise processing unit of a noise reduction device provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] 10 - noise receiving unit; 110 - first microphone; 120 - second microphone; 20 - noise processing unit; 210 - comparator; 220 - inverter; 30 - sound generating unit; 40 - receiver.

[0030] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0032] In the embodiments of the present application, 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 number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0033] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0034] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0035] In the present application, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0036] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0037] In the prior art, some manufacturers have designed a high-volume mode for the handset to improve the quality of calls by increasing the loudness of the handset to reduce the impact of environmental noise on users. However, the high-volume mode of the handset causes long-term high-volume calls to be held close to the ear, which can cause discomfort to the ear and affect hearing. In addition, in a noisy environment, the content of the call is unclear and the hearing of the human ear can be seriously damaged.

[0038] The noise reduction device and electronic device provided by the present application are electrically connected through a noise receiving unit and a noise processing unit, and the noise processing unit is electrically connected to a sound-emitting unit; the noise receiving unit is used to collect the ambient noise around the earpiece and send the ambient noise to the noise processing unit; the noise processing unit is used to perform anti-phase processing on the ambient noise to obtain a reverse sound wave, and send the reverse sound wave to the sound-emitting unit; the sound-emitting unit is used to output the reverse sound wave, and the sound output direction of the sound-emitting unit is different from that of the earpiece, so that in a noisy environment, the ambient noise can be collected and processed, and the processed reverse sound wave is output by the sound-emitting unit, thereby forming a quiet area near the user's auricle to achieve the effect of reducing noise.

[0039] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0040] See also Figure 1 to Figure 2 An embodiment of the present application provides a noise reduction device, wherein the noise reduction device may include a noise receiving unit 10, a noise processing unit 20 and a sound generating unit 30.

[0041] Specifically, the noise receiving unit 10 is electrically connected to the noise processing unit 20 , and the noise processing unit 20 is electrically connected to the sound generating unit 30 .

[0042] The noise receiving unit 10 is used to collect the ambient noise around the earpiece 40 and send the ambient noise to the noise processing unit 20. The noise receiving unit 10 usually includes one or more high-sensitivity microphones, which can accurately capture the ambient noise near the user's auricle; the noise processing unit 20 is used to perform a series of signal processing steps such as inverting phase processing on the ambient noise after receiving the ambient noise, obtain a reverse sound wave, and send the reverse sound wave to the sound-emitting unit 30; the sound-emitting unit 30 is used to output the reverse sound wave, and the sound output direction of the reverse sound wave output by the sound-emitting unit 30 is different from the sound output direction of the earpiece, so that it cancels out the ambient noise, thereby creating a relatively quiet space near the user's auricle, significantly improving the clarity and quality of calls or listening.

[0043] Among them, environmental noise can include a variety of interfering sounds from the environment, which are usually not the main content that users want to hear through the handset, such as traffic noise (such as cars, motorcycles, buses, etc.), industrial noise (such as factory machinery operation, construction, etc.), natural noise (such as wind, rain, thunder, etc.), crowd noise (such as people talking, laughing, shouting, etc.), animal noise (such as pet calls, birds singing, insects buzzing, etc.) and electrical noise (such as the sound made by the operation of household appliances such as air conditioners, fans, refrigerators, washing machines, etc.).

[0044] The embodiment of the present application collects and processes environmental noise by setting up a noise receiving unit, a noise processing unit and a sound emitting unit independent of the earpiece, and outputs the processed reverse sound waves through the sound emitting unit, thereby forming a quiet area near the user's auricle to achieve the effect of reducing noise.

[0045] In some embodiments, the sound output direction of the sound unit 30 can be opposite to the sound output direction of the earpiece 40, so as to avoid the reverse sound waves directly entering the user's ears when the sound output direction of the sound unit 30 is the same as the sound output direction of the earpiece 40, partially offsetting or interfering with the call content or other audio signals emitted from the earpiece 40, causing the effective sound heard by the user to become blurred or distorted.

[0046] Specifically, the sound unit 30 can be set behind the sound outlet of the earpiece 40. When the earpiece 40 is set on the front of the device (such as a mobile phone), the sound unit 30 can be set on the back of the device. When the user puts the ear close to the earpiece 40, the sound unit 30 outputs reverse sound waves on the back of the screen. This ensures that the reverse sound waves mainly act on the ambient noise around the auricle instead of directly entering the user's ear, thereby avoiding affecting the content of the call on this end.

[0047] When the user holds the phone to make a call, the receiver 40 is placed close to the auricle to make a sound, and at the same time, the noise receiving unit 10 receives the ambient noise. The noise processing unit 20 adjusts the phase of the ambient noise to obtain a reverse sound wave, which is sent to the sound-generating unit 30, and the sound-generating unit 30 outputs the reverse sound wave. At this time, the sound emitted by the sound-generating unit 30 is in opposite phase to the ambient noise around the auricle. According to the characteristics of sound, sounds with opposite phases will cancel each other out when they meet, resulting in a silent effect. Therefore, a silent area is formed near the auricle, which is equivalent to the human ear being in a quiet environment. At this time, the sound emitted by the receiver 40 will not be disturbed by the external environment and will become clear, so that the volume of the receiver 40 does not need to be increased to a large volume or designed to a high volume mode, thereby protecting the human ear's hearing.

[0048] The embodiment of the present application limits the sound emission direction of the sound unit to be opposite to the sound emission direction of the earpiece, so that the reverse sound waves emitted by the sound unit only act on the ambient noise and do not affect the effective sound heard by the user from the earpiece. The sound emission direction can be limited by arranging the sound unit behind the sound outlet of the earpiece.

[0049] In some embodiments, the noise receiving unit 10 may include a microphone, and the microphone is arranged close to the earpiece 40, so as to more accurately capture the ambient noise near the user's auricle, ensure that the collected ambient noise is closer to the noise that actually affects the call quality, and monitor the changes in the ambient noise near the user's auricle in real time, so as to quickly respond and adjust the generation and output of reverse sound waves, thereby improving the noise reduction effect and achieving more efficient noise cancellation.

[0050] Specifically, the microphone may include a first microphone 110 and a second microphone 120. The first microphone 110 and the second microphone 120 may be symmetrically arranged on both sides of the sound unit 30. By arranging two microphones on both sides of the sound unit 30, environmental noise can be collected from different positions at the same time, and the surrounding noise information can be captured more comprehensively to improve the accuracy of noise reduction. The symmetrically designed first microphone 110 and second microphone 120 can determine the direction of the noise source by comparing the time difference or intensity difference of the sound signals received by the two microphones, which helps to locate the noise source more accurately, thereby performing more targeted noise reduction processing. For example, in a noisy cafe environment, the first microphone 110 may mainly receive conversations from the crowd on the left, while the second microphone 120 captures more of the buzzing sound of the machine on the right. Combining the two, the system can construct a more complete noise map.

[0051] In addition, multiple microphones can be set near the sound unit 30 to form a microphone array, which can capture the noise in the environment more comprehensively, further improve the accuracy of noise reduction, and achieve deep optimization of noise collection through beamforming technology. Beamforming technology is a technology that enhances the signal receiving capability in a specific direction by adjusting the phase and amplitude of each microphone signal in the microphone array. In noise reduction applications, the microphone array can focus on enhancing the noise signal from a specific direction while effectively suppressing noise interference from other directions. This capability is particularly important for noise management in complex environments. For example, in a high-speed rail car, passengers may be disturbed by multiple noise sources such as the sound of the train, the conversations of other passengers, and the operation of equipment in the car. Through beamforming technology, the noise reduction system can more accurately identify and process these noise sources, thereby achieving more accurate and effective noise cancellation, providing users with a quieter call or listening environment.

[0052] like Figure 3 As shown, the microphone of the noise receiving unit 10 can also be set on the back of the earpiece 40, close to the sound-emitting unit 30, so as to more directly capture the ambient noise that is about to be offset by the reverse sound wave, and to more effectively cancel the noise. At the same time, the distance between the microphone and the sound-emitting unit 30 is short, and the signal path is short, which can reduce the delay and distortion in the signal transmission process and improve the real-time and accuracy of the noise cancellation.

[0053] There may be one or more microphones disposed on the back of the earpiece 40 to meet different design requirements and application scenarios.

[0054] The embodiment of the present application limits the position and number of microphones in the noise receiving unit, so that the collection of environmental noise can be more accurate and timely, thereby improving the accuracy of noise reduction.

[0055] See also Figure 4 An embodiment of the present application provides a noise reduction device, wherein the noise processing unit 20 may include: a comparator 210 and an inverter 220.

[0056] Specifically, the comparator 210 can judge the ambient noise level to decide whether to activate the sound unit 30. One input end of the comparator 210 is used to receive the ambient noise emitted by the noise receiving unit 10, and the other input end is used to input the noise threshold. The comparator 210 compares the ambient noise and the noise threshold. When the ambient noise is less than the noise threshold, it means that the ambient noise in the user's environment is small at this time, and the impact on the user's call or listening experience is small, and no noise reduction processing is required. The output end of the comparator 210 does not output an activation signal for inputting the sound unit 30; when the ambient noise is greater than or equal to the noise threshold, it means that the ambient noise in the user's environment is large at this time, and noise reduction processing is required. The output end of the comparator 210 outputs an activation signal for inputting the sound unit 30. The sound unit 30 will adjust its working state according to the received activation signal, generate reverse sound waves to offset the ambient noise, thereby providing the user with a clearer and quieter auditory environment.

[0057] Among them, the user can set the noise threshold according to user preferences, environment type and application scenario, etc., and no specific limitation is made here.

[0058] The input end of the inverter 220 is used to receive the environmental noise emitted from the noise receiving unit 10, and the output end is used to send the reverse sound wave to the sound generating unit 30. After receiving the environmental noise, the inverter 220 performs inversion processing on the environmental noise to obtain the reverse sound wave, and sends the reverse sound wave to the sound generating unit 30 through the output end.

[0059] Among them, after receiving the ambient noise, the inverter 220 performs inverted phase processing on the ambient noise. Specifically, the inverter 220 uses signal processing techniques such as Fourier transform to decompose the collected ambient noise signal into multiple sine and / or cosine components, which represent the components of the noise signal at different frequencies, and then generates an inverted signal with a phase difference of 180 degrees according to each decomposed sine and / or cosine component to obtain a reverse sound wave. At the same time, in order to ensure that the noise signal can be completely offset, it is necessary to ensure that each sine or cosine component has the same amplitude as its corresponding inverted signal.

[0060] In order to achieve the best noise reduction effect, the inverter 220 can perform a series of complex signal processing steps on the noise signal in addition to the inversion process, and these steps include but are not limited to the following aspects:

[0061] Automatic gain control (AGC) technology is used to ensure that the strength of the reverse sound wave matches the ambient noise, avoiding incomplete cancellation or excessive cancellation caused by excessively strong or weak reverse sound waves. In addition, by balancing the output gain, the reverse sound wave is kept in a suitable ratio with the earpiece 40 or other audio output signals, so as to ensure the balance and clarity of the overall audio output;

[0062] The sound of different frequency bands is enhanced or attenuated by an equalizer (EQ) to optimize the frequency response of the reverse sound waves. For example, the reverse sound waves of certain frequency bands can be strengthened to better offset the noise of specific frequencies. In this way, the reverse sound waves of the corresponding frequency bands can be selectively adjusted for different types of noise, such as low-frequency humming, high-frequency howling, etc., to achieve more accurate noise cancellation;

[0063] Ensure that the reverse sound wave is completely synchronized with the ambient noise in time to avoid phase deviation caused by inconsistent sampling rates, which affects the noise cancellation effect. Through high-precision sampling and quantization technology, ensure that the reverse sound wave is distortion-free during transmission and ensure its accurate cancellation with the ambient noise;

[0064] Through the rapid detection and response mechanism, it can quickly identify and process sudden high-energy noises, such as car horns and screams, and generate corresponding reverse sound waves to offset them. It uses transient suppression technology to quickly generate high-intensity reverse sound waves to effectively suppress sudden high-energy noise, protect the user's hearing and maintain the clarity of calls or listening.

[0065] According to these comprehensive processes, the anti-phase signal generated by the inverter 220 can accurately cancel each other with the ambient noise, thereby creating a relatively quiet space near the user's auricle, significantly improving the clarity and quality of calls or listening.

[0066] The sound unit 30 is in an activated state after receiving the activation signal sent by the comparator 210. In the activated state, the sound unit 30 can output a reverse sound wave. Therefore, after receiving the reverse sound wave sent by the inverter 220, the sound unit 30 in the activated state outputs the reverse sound wave to offset the ambient noise and achieve the effect of noise reduction.

[0067] The embodiment of the present application sets an inverter in the noise processing unit to perform inverse phase processing on the environmental noise and output reverse sound waves to the sound-emitting unit. A comparator is set in the noise processing unit to judge the noise level of the current environment. When the noise is small, the sound-emitting unit is not activated to perform noise reduction to save energy. When the noise is large, the sound-emitting unit is activated to output reverse sound waves to perform noise reduction.

[0068] Based on the same concept, an embodiment of the present application also provides an electronic device, including a handset 40 and the above-mentioned noise reduction device provided in an embodiment of the present application. The electronic device may include a mobile phone, headphones, true wireless stereo TWS (TrueWireless Stereo) headphones, and other devices that can provide users with an audio experience.

[0069] In the headset, the noise receiving unit 10 can be arranged inside or outside the earmuff to capture the ambient noise, and then send the captured ambient noise to the noise processing unit 20. The noise processing unit 20 can be built into the headset to adjust the phase of the ambient noise, generate reverse sound waves, and send the reverse sound waves to the sound generating unit 30. The sound generating unit can be arranged inside the earmuff, and its sound output direction is opposite to the sound output direction of the earphone receiver 40. The headset itself has a good physical sound insulation effect, and combined with the active noise reduction technology, the influence of the ambient noise can be further reduced.

[0070] The above technical description may refer to the accompanying drawings, which form a part of the present application, and the implementation methods according to the described embodiments are shown in the accompanying drawings by description. Although these embodiments are described in sufficient detail to enable those skilled in the art to implement these embodiments, these embodiments are non-restrictive; other embodiments can be used in this way, and changes can be made without departing from the scope of the described embodiments. For example, the order of operations described in the flowchart is non-restrictive, so the order of two or more operations illustrated in the flowchart and described according to the flowchart can be changed according to several embodiments. As another example, in several embodiments, one or more operations illustrated in the flowchart and described according to the flowchart are optional or deletable. In addition, certain steps or functions can be added to the disclosed embodiments, or the order of two or more steps can be replaced. All these changes are considered to be included in the disclosed embodiments and claims.

[0071] In addition, terms are used in the above technical description to provide a thorough understanding of the described embodiments. However, overly detailed details are not required to implement the described embodiments. Therefore, the above description of the embodiments is presented for the purpose of explanation and description. The embodiments presented in the above description and the examples disclosed according to these embodiments are provided separately to add context and help understand the described embodiments. The above description is not intended to be exhaustive or to limit the described embodiments to the precise form of the present application. According to the above teachings, several modifications, selective applications and changes are feasible. In some cases, well-known processing steps are not described in detail to avoid unnecessarily affecting the described embodiments.

[0072] Specific embodiments are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the core idea of ​​this application. At the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

[0073] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A noise reduction device, characterized in that: include: Noise receiving unit, noise processing unit and sound generating unit, wherein: The noise receiving unit is electrically connected to the noise processing unit, and the noise processing unit is electrically connected to the sound generating unit; The noise receiving unit is used to collect the environmental noise around the earpiece and send the environmental noise to the noise processing unit; The noise processing unit is used to perform inverse phase processing on the environmental noise to obtain a reverse sound wave, and send the reverse sound wave to the sound generating unit; The sound-emitting unit is used to output the reverse sound wave, and the sound-emitting direction of the sound-emitting unit is different from the sound-emitting direction of the earpiece.

2. The noise reduction device according to claim 1, characterized in that: The sound emitting direction of the sound emitting unit is opposite to the sound emitting direction of the earpiece.

3. The noise reduction device according to claim 2, characterized in that: The sound-emitting unit is arranged behind the sound outlet of the earpiece.

4. The noise reduction device according to any one of claims 1 to 3, characterized in that: The noise receiving unit includes a microphone, and the microphone is arranged close to the earpiece.

5. The noise reduction device according to claim 4, characterized in that: The microphone is arranged on the back side of the receiver.

6. The noise reduction device according to claim 4, characterized in that: The microphone includes a first microphone and a second microphone.

7. The noise reduction device according to claim 6, characterized in that: The first microphone and the second microphone are symmetrically arranged on two sides of the sound generating unit.

8. The noise reduction device according to any one of claims 1 to 3, characterized in that: The noise processing unit includes a comparator and an inverter, wherein: One input terminal of the comparator is used to input the environmental noise, and another input terminal of the comparator is used to input a noise threshold. The comparator is used to output, through an output terminal, an activation signal for inputting the sound-emitting unit when the environmental noise is greater than or equal to the noise threshold; The inverter is electrically connected to the noise receiving unit and the sound generating unit, and is used to perform inverse phase processing on the ambient noise to obtain a reverse sound wave, and send the reverse sound wave to the sound generating unit.

9. An electronic device, characterized in that: The device comprises a device body provided with an earpiece and the noise reduction device according to any one of claims 1 to 8.

10. The electronic device according to claim 9, characterized in that: Including mobile phones, headphones and true wireless stereo TWS earphones.

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