Noise reduction device and electronic equipment

Abstract

The utility model 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 field of noise reduction technology, in particular to a noise reduction device and electronic equipment. BACKGROUND

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

[0003] Currently, in response to this problem, some manufacturers have designed a large-volume mode for the earpiece, which increases the loudness of the earpiece to reduce the impact of environmental noise on users, achieving the effect of improving call quality.

[0004] However, the large-volume mode of the earpiece causes long-term high-volume close-to-ear calls, which can cause ear discomfort and affect hearing. In addition, in a noisy environment, the call content is not clear, and the human ear hearing will be severely damaged. CONTENT OF THE INVENTION

[0005] The present application provides a noise reduction device and electronic equipment to solve the problem of poor noise reduction effect of the existing large-volume mode of the earpiece.

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

[0007] The noise receiving unit and the noise processing unit are electrically connected, and the noise processing unit is electrically connected with the sound emitting unit;

[0008] The noise receiving unit is configured to collect environmental noise around the earpiece and send the environmental noise to the noise processing unit;

[0009] The noise processing unit is configured to perform inverse phase processing on the environmental noise to obtain a reverse sound wave, and send the reverse sound wave to the sound emitting unit;

[0010] The sound emitting unit is configured 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.

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

[0012] In one possible implementation, the sound emitting unit is disposed behind the sound emitting port of the earpiece.

[0013] In one 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 arranged on the back of the earpiece.

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

[0016] In a possible implementation, 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 comprises a comparator and an inverter, wherein:

[0018] One input end of the comparator is configured to input the ambient noise, the other input end of the comparator is configured to input the noise threshold, and the comparator is configured to output an activation signal for the sound generating unit through the output end when the ambient noise is greater than or equal to the noise threshold;

[0019] The inverter is electrically connected with the noise receiving unit and the sound generating unit, and is configured to perform phase inversion processing on the ambient noise to obtain a reverse sound wave and send the reverse sound wave to the sound generating unit.

[0020] In another aspect, the embodiments of the present application provide an electronic device, comprising a device main body, the device main body is provided with an earpiece and a noise reduction device according to any one of the above embodiments.

[0021] In a possible implementation, the electronic device comprises a mobile phone, a headset and a true wireless stereo (TWS) earphone.

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

[0023] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0024] Figure 1 A front view of the noise reduction device provided by the embodiments of the present application;

[0025] Figure 2A back view of the noise reduction device provided in the embodiments of the present application is shown in FIG. 1B.

[0026] Figure 3 A relative position diagram of another noise receiving unit provided in the embodiments of the present application is shown in FIG. 2B.

[0027] Figure 4 A structure diagram of a noise processing unit of the noise reduction device provided in the embodiments of the present application is shown in FIG. 3B.

[0028] Reference signs:

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

[0030] The specific embodiments of the present application have been shown and described in the above-described drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same components in different drawings. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses 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 only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

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

[0034] In the embodiments of the present application, unless specifically defined and limited otherwise, the term "connection" should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be direct connection, or indirect connection through intermediate medium.

[0035] In the embodiments of the present application, the terms "comprising", "containing" or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, article or apparatus that comprises a list of elements not only includes those elements, but also includes other elements not expressly listed, or inherent to such process, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, article or apparatus comprising the element.

[0036] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be construed as being preferred or superior over other embodiments or designs. In fact, the use of the words such as "exemplary" or "for example" is intended to present concepts in a particular manner.

[0037] In the prior art, some manufacturers have designed a large volume mode of the earpiece to reduce the impact of environmental noise on users and improve the quality of communication by increasing the loudness of the earpiece. However, the large volume mode of the earpiece causes long-time large-volume communication close to the ear, which makes people feel uncomfortable and affects hearing. In addition, in a noisy environment, the communication content is not clear, and the human ear hearing will be severely damaged.

[0038] The noise reduction device and the electronic equipment 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 with a sound emitting unit. The noise receiving unit is used to collect 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 reverse sound waves and send the reverse sound waves to the sound emitting unit. The sound emitting unit is used to output the reverse sound waves, and the sound emitting unit has a sound output direction different from that of the earpiece. In a noisy environment, the environmental noise is collected and processed, and the reverse sound waves obtained by processing are output through the sound emitting unit, so as to form a quiet area near the user's pinna, thereby reducing noise.

[0039] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail in the specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0040] Referring to Figures 1 to 2 The embodiment of the present application provides a noise reduction device, wherein the noise reduction device can comprise a noise receiving unit 10, a noise processing unit 20 and a sound emitting unit 30.

[0041] Specifically, the noise receiving unit 10 and the noise processing unit 20 are electrically connected, and the noise processing unit 20 is electrically connected with the sound emitting unit 30.

[0042] The noise receiving unit 10 is used for collecting environmental noise around the earphone 40 and sending the environmental noise to the noise processing unit 20, and the noise receiving unit 10 usually comprises one or more high-sensitivity microphones, which can accurately capture the environmental noise near the user's pinna; the noise processing unit 20 is used for performing a series of signal processing steps such as inverse phase processing on the received environmental noise to obtain an inverse sound wave, and sending the inverse sound wave to the sound emitting unit 30; the sound emitting unit 30 is used for outputting the inverse sound wave, and the sound emitting unit 30 outputs the inverse sound wave in a direction different from the sound emitting direction of the earphone, so that the environmental noise is mutually cancelled, thereby creating a relatively quiet space near the user's pinna and significantly improving the clarity and quality of the call or the sound listening.

[0043] Among them, the environmental noise can include various interference sounds from the environment, which are usually not the main content that the user wants to hear through the earphone, 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 barking, bird chirping, insect buzzing, etc.) and electrical appliance noise (such as air conditioner, fan, refrigerator, washing machine, etc.).

[0044] The embodiment of the present application collects and processes the environmental noise by setting the noise receiving unit, the noise processing unit and the sound emitting unit independent of the earphone, and outputs the obtained inverse sound wave through the sound emitting unit, thereby forming a quiet area near the user's pinna and achieving the effect of reducing noise.

[0045] In some embodiments, the sound emitting direction of the sound emitting unit 30 can be opposite to the sound emitting direction of the earphone 40, so as to avoid that when the sound emitting direction of the sound emitting unit 30 is the same as the sound emitting direction of the earphone 40, the inverse sound wave directly enters the user's ear, partially cancels or interferes with the call content or other audio signals emitted from the earphone 40, and the effective sound heard by the user becomes blurred or distorted.

[0046] Specifically, the sound generating unit 30 can be arranged behind the sound outlet of the earpiece 40. When the earpiece 40 is arranged on the front of a device (such as a mobile phone), the sound generating unit 30 can be arranged on the back of the device. When the user puts the ear close to the earpiece 40, the sound generating unit 30 outputs the reverse sound wave behind the screen. In this way, it can be ensured that the reverse sound wave mainly acts on the ambient noise around the pinna, rather than directly entering the user's ear, thereby avoiding affecting the content of the local call.

[0047] When the user holds the call, the earpiece 40 is arranged close to the pinna to generate sound, and the noise receiving unit 10 receives the ambient noise. The noise processing unit 20 adjusts the phase of the ambient noise to obtain the reverse sound wave, which is sent to the sound generating unit 30. The sound generating unit 30 outputs the reverse sound wave. At this time, the sound emitted by the sound generating unit 30 is opposite in phase to the ambient noise around the pinna. According to the characteristics of sound, the sound opposite in phase will cancel each other out when they meet, thereby generating a mute effect. Therefore, a mute area is formed near the pinna, which is equivalent to the human ear being in a quiet environment. At this time, the sound emitted by the earpiece 40 will not be disturbed by the external environment and will become clear, thereby making it unnecessary to increase the volume of the earpiece 40 to a large or large volume mode, thereby protecting the hearing of the human ear.

[0048] The embodiments of the present application limit the sound generating unit to be opposite in sound emitting direction to the sound emitting direction of the earpiece, so that the reverse sound wave emitted by the sound generating unit only acts on the ambient noise and does not affect the effective sound heard by the user from the earpiece. The way to limit the sound emitting direction can be to arrange the sound generating unit behind the sound outlet of the earpiece.

[0049] In some embodiments, the noise receiving unit 10 can include a microphone, and the microphone is arranged close to the earpiece 40. It can more accurately capture the ambient noise near the pinna of the user, ensure that the collected ambient noise is more close to the noise actually affecting the call quality, and also can monitor the change of the ambient noise near the pinna of the user in real time, so as to quickly respond and adjust the generation and output of the reverse sound wave, thereby improving the effect of reducing noise and achieving more efficient noise cancellation.

[0050] Specifically, the microphone can include a first microphone 110 and a second microphone 120, which can be symmetrically arranged on both sides of the sound emitting unit 30. By arranging two microphones on both sides of the sound emitting unit 30, environmental noise can be collected simultaneously from different positions, more comprehensive noise information can be captured, and the accuracy of noise reduction can be improved. The symmetrically designed first microphone 110 and the 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 more accurately locate the noise source and thus perform more targeted noise reduction processing. For example, in a noisy coffee shop environment, the first microphone 110 may mainly receive the conversation from the left group of people, while the second microphone 120 may mainly capture the humming sound of the machine on the right. By combining the two, the system can construct a more complete noise map.

[0051] In addition, a plurality of microphones can be arranged near the sound emitting unit 30 to form a microphone array, which can more comprehensively capture environmental noise and further improve the accuracy of noise reduction. Through the beamforming technology, the depth optimization of noise collection can be achieved. Beamforming is a technology that adjusts the phase and amplitude of signals from each microphone in an array to enhance signal reception in a specific direction. In noise reduction applications, the microphone array can focus on enhancing noise signals from a specific direction while effectively suppressing noise interference from other directions. This capability is particularly important for noise management in complex environments, such as inside a high-speed train car, where passengers may be disturbed by multiple noise sources such as train running sound, other passenger conversation, and equipment operation sound inside the car. Through the beamforming technology, the noise reduction system can more accurately identify and process these noise sources, thereby achieving more accurate and effective noise cancellation and providing a more peaceful communication or listening environment for users.

[0052] As shown in Figure 3 The microphone of the noise receiving unit 10 can also be arranged on the back of the earpiece 40, close to the sound emitting unit 30, which can more directly capture environmental noise to be canceled by the reverse wave, and can more effectively perform noise cancellation. At the same time, the microphone is close to the sound emitting unit 30, the signal path is short, which can reduce the delay and distortion in the signal transmission process, and improve the real-time performance and accuracy of noise cancellation.

[0053] Among them, the microphone arranged on the back of the earpiece 40 can be one or more to adapt to different design requirements and application scenarios.

[0054] The embodiments of the present application can make the collection of environmental noise more accurate and timely by limiting the position and number of microphones in the noise receiving unit, thereby improving the accuracy of noise reduction.

[0055] Referring to Figure 4 The embodiment of the present application provides a noise reduction device, wherein the noise processing unit 20 can comprise a comparator 210 and an inverter 220.

[0056] Specifically, the comparator 210 can determine the ambient noise level, so as to determine whether to activate the sound generating unit 30. An input end of the comparator 210 is used for receiving the ambient noise emitted from the noise receiving unit 10, and the other input end is used for inputting a noise threshold. The comparator 210 compares the ambient noise with the noise threshold. When the ambient noise is less than the noise threshold, it indicates that the ambient noise of the environment where the user is located is small, and the influence on the user's call or listening experience is small, so that noise reduction processing is not needed, and the output end of the comparator 210 does not output an activation signal for the sound generating unit 30. When the ambient noise is greater than or equal to the noise threshold, it indicates that the ambient noise of the environment where the user is located is large, and noise reduction processing is needed, and the output end of the comparator 210 outputs the activation signal for the sound generating unit 30. The sound generating unit 30 will adjust its working state according to the received activation signal to generate a reverse sound wave to offset the ambient noise, thereby providing a clearer and quieter auditory environment for the user.

[0057] The noise threshold can be set by the user according to user preferences, environment types and application scenarios, which is not limited here.

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

[0059] The inverter 220 performs phase inversion processing on the ambient noise after receiving the ambient noise. Specifically, the inverter 220 can use Fourier transform and other signal processing technologies to decompose the collected ambient noise signal into a plurality of sine and / or cosine components, which represent the components of the noise signal at different frequencies. According to each decomposed sine and / or cosine component, a reverse signal with a phase difference of 180 degrees is generated to obtain the reverse sound wave. 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 reverse 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 phase inversion processing. These steps include but are not limited to the following aspects:

[0061] By automatic gain control (AGC) technology, the intensity of the reverse sound wave is matched with the environmental noise, avoiding incomplete cancellation or over-cancellation caused by too strong or too weak reverse sound wave, in addition, by balancing the output gain, the reverse sound wave and the earphone 40 or other audio output signal maintain a proper proportion to ensure the balance and clarity of the overall audio output;

[0062] By equalizer (EQ), the sound of different frequency bands is enhanced or attenuated to optimize the frequency response of the reverse sound wave, for example, the reverse sound wave of certain frequency band can be strengthened to better cancel the noise of specific frequency, so that different types of noise such as low-frequency hum, high-frequency squeal, etc. can be selectively adjusted to achieve more accurate noise cancellation.

[0063] Ensure that the reverse sound wave is completely synchronized with the environmental noise in time, avoid phase deviation caused by inconsistent sampling rate, so as to affect the noise cancellation effect, through high-precision sampling and quantization technology, ensure the distortionless of the reverse sound wave in the transmission process, and ensure the accurate cancellation of the environmental noise;

[0064] Through the rapid detection and response mechanism, sudden high-energy noise such as car horn, scream, etc. is quickly identified and processed, and the corresponding reverse sound wave is generated for cancellation, and the transient suppression technology is adopted to quickly generate high-intensity reverse sound wave to effectively suppress the sudden high-energy noise, protect the user's hearing and maintain the clarity of the conversation or listening.

[0065] According to these comprehensive treatments, the reverse phase signal generated by the inverter 220 can accurately cancel the environmental noise, thereby creating a relatively quiet space near the user's pinna, significantly improving the clarity and quality of the conversation or listening.

[0066] The sound generating unit 30 is in an activated state after receiving the activation signal from the comparator 210. The sound generating unit 30 in the activated state can output the reverse sound wave, so that the sound generating unit 30 in the activated state outputs the reverse sound wave after receiving the reverse sound wave from the inverter 220, so as to cancel the environmental noise and achieve the effect of noise reduction.

[0067] The embodiment of the present application can perform phase inversion processing on the environmental noise by setting the inverter in the noise processing unit, output the reverse sound wave to the sound generating unit, set the comparator in the noise processing unit, and judge the noise size of the current environment. When the noise is small, the sound generating unit is not activated for noise reduction, saving energy, and when the noise is large, the sound generating unit is activated to output the reverse sound wave for noise reduction.

[0068] Based on the same concept, the application further provides an electronic device, which comprises a receiver 40 and the above-mentioned noise reduction device provided by the application. The electronic device can comprise a mobile phone, a headset, a true wireless stereo (TWS) earphone, and other devices capable of providing audio experience for users.

[0069] In the headset, the noise receiving unit 10 can be arranged inside or outside the ear cover to capture the environmental noise, and then send the captured environmental noise to the noise processing unit 20. The noise processing unit 20 can be built-in in the headset, and can adjust the phase of the environmental noise, generate a reverse sound wave, and send the reverse sound wave to the sound generating unit 30. The sound generating unit can be arranged inside the ear cover, and the sound output direction thereof is opposite to the sound output direction of the receiver 40 of the headset. The headset itself has a good physical sound insulation effect, and in combination with the active noise reduction technology, the influence of the environmental noise can be further reduced.

[0070] The above technical description can refer to the accompanying drawings, which form a part of the application, and the implementation according to the described embodiments is shown in the drawings by description. Although these embodiments are described in sufficient detail to enable those skilled in the art to implement them, these embodiments are non-limiting; thus, other embodiments can be used, and changes can be made without departing from the scope of the described embodiments. For example, the order of operations described in the flowcharts is non-limiting, and thus the order of two or more operations illustrated in and described according to the flowcharts can be changed according to several embodiments. As another example, one or more operations illustrated in and described according to the flowcharts are optional, or can be deleted, in several embodiments. 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, the terms used in the above technical description are used to provide a thorough understanding of the described embodiments. However, it is not necessary to use overly detailed details to implement the described embodiments. Therefore, the above description of the embodiments is presented for illustration 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 used to be exhaustive or to limit the described embodiments to the exact form of the application. According to the above teachings, several modifications, selections, and changes are possible. In some cases, well-known processing steps are not described in detail to avoid unnecessarily affecting the described embodiments.

[0072] The principles and implementation manners of the present application are described in the specific embodiments in the present application, and the above embodiment descriptions are only used to help understand the core ideas of the present application; meanwhile, for those skilled in the art, according to the ideas of the present application, the specific implementation manners and application ranges can be changed, and the above descriptions should not be understood as limitations to the present application.

[0073] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A noise reduction device, characterized by, The application relates to a noise reduction device. The noise reduction device comprises a noise receiving unit, a noise processing unit and a sound emitting unit, wherein: The noise receiving unit and the noise processing unit are electrically connected, and the noise processing unit is electrically connected with the sound emitting unit; The noise receiving unit is used for collecting environmental noise around a receiver and sending the environmental noise to the noise processing unit; The noise processing unit is used for performing reverse phase processing on the environmental noise to obtain reverse sound waves and sending the reverse sound waves to the sound emitting unit; The sound emitting unit is used for outputting the reverse sound waves, and the sound emitting direction of the sound emitting unit is different from the sound emitting direction of the receiver.

2. The noise reducing device of claim 1, wherein, The sound emitting direction of the sound emitting unit is opposite to the sound emitting direction of the receiver.

3. The noise reducing device of claim 2, wherein, The sound emitting unit is arranged behind the sound emitting port of the receiver.

4. The noise reducing device of any one of claims 1 to 3, wherein, The noise receiving unit comprises a microphone which is arranged close to the receiver.

5. The noise reducing device of claim 4, wherein, The microphone is arranged on the back of the receiver.

6. The noise reducing device of claim 4, wherein, The microphone comprises a first microphone and a second microphone.

7. The noise reducing device of claim 6, wherein, The first microphone and the second microphone are symmetrically arranged on the two sides of the sound emitting unit.

8. The noise reducing device of any one of claims 1 to 3, wherein, The noise processing unit comprises a comparator and an inverter, wherein: One input end of the comparator is used for inputting the environmental noise, and the other input end of the comparator is used for inputting a noise threshold value; when the environmental noise is greater than or equal to the noise threshold value, the comparator is used for outputting an activation signal for the sound emitting unit through an output end; The inverter is electrically connected with the noise receiving unit and the sound emitting unit, and the inverter is used for performing reverse phase processing on the environmental noise to obtain reverse sound waves and sending the reverse sound waves to the sound emitting unit.

9. An electronic device, comprising: The application further relates to a device main body which is provided with a receiver and the noise reduction device.

10. The electronic device of claim 9, wherein, The device main body comprises a mobile phone, a headphone and a true wireless stereo (TWS) earphone.

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