CN110099323B - Active noise reduction earphone - Google Patents
Active noise reduction earphone Download PDFInfo
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- CN110099323B CN110099323B CN201910434244.3A CN201910434244A CN110099323B CN 110099323 B CN110099323 B CN 110099323B CN 201910434244 A CN201910434244 A CN 201910434244A CN 110099323 B CN110099323 B CN 110099323B
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- noise reduction
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- low
- active noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
Abstract
The invention discloses an active noise reduction earphone which comprises a shell, wherein the front end of the shell is provided with a sound outlet, a feedback microphone, a low-frequency loudspeaker unit, a medium-high frequency loudspeaker unit and a noise reduction circuit are arranged in the shell and used for picking up environmental sound, and the feedback microphone is only electrically connected with the low-frequency loudspeaker unit through the noise reduction circuit. By applying the active noise reduction earphone provided by the invention, the feedback microphone collects the environmental noise in the earphone and outputs a signal with the same amplitude and opposite phase to the environmental noise to the low-frequency loudspeaker unit after being processed by the noise reduction circuit. High-frequency amplitude is not required to be reduced by adjusting a filter, and high-frequency howling is avoided in a physical mode.
Description
Technical Field
The invention relates to the technical field of earphones, in particular to an active noise reduction earphone.
Background
In recent years, active noise reduction earphones are advocated to meet the requirement of people on quiet song listening. The noise reduction mode of the active noise reduction earphone can be generally divided into analog noise reduction and digital noise reduction, and signals with the same amplitude and the opposite phase with external noise are generated through the design of a filter, so that the noise reduction effect is realized. Common types of noise reduction include feedforward noise reduction, feedback noise reduction, and hybrid noise reduction, which are widely used in headsets, ear plugs, in-ear headphones, and the like. However, the design of the filter is mutually constrained by two aspects of phase and amplitude, and the problem of high-frequency howling is easily caused in feedback noise reduction, so that the use is influenced.
In summary, how to effectively solve the problems of high-frequency howling of the feedback noise reduction earphone and the like is a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, the present invention provides an active noise reduction earphone, which has a structural design that can effectively avoid the problem of high-frequency howling of the feedback noise reduction earphone.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an earphone of making an uproar falls in initiative, includes the casing, the front end of casing has the phonate hole, be provided with the feedback microphone that is used for picking up the environment sound in the casing, be provided with woofer unit, well high frequency speaker unit and the circuit of making an uproar falls in the casing, the feedback microphone passes through the circuit of making an uproar falls only with woofer unit electricity is connected.
Preferably, in the above active noise reduction earphone, the front end of the woofer unit has a blocking component to enclose with the housing to form a woofer unit front cavity, and the blocking component has a sound conduit communicating the cavity at the front end of the blocking component and the woofer unit front cavity, and the middle and high frequency loudspeaker unit is disposed in the cavity at the front end of the blocking component.
Preferably, in the above active noise reduction earphone, the feedback microphone is disposed in a cavity at the front end of the blocking component.
Preferably, in the active noise reduction earphone, the middle-high frequency speaker unit is fixed to a front end surface of the baffle member.
Preferably, in the above active noise reduction earphone, an installation groove for installing the middle and high frequency speaker unit is provided on the front end surface of the blocking component, and the rear end of the middle and high frequency speaker unit is attached to the bottom surface of the installation groove.
Preferably, in the above active noise reduction earphone, a rear cavity of the woofer unit is disposed at a rear side of the woofer unit.
Preferably, in the above active noise reduction earphone, the blocking component is a partition plate, and an outer edge of the partition plate abuts against an inner wall of the housing.
Preferably, in the above active noise reduction earphone, the partition plate is integrally formed with the housing.
Preferably, in the above active noise reduction earphone, the sound guide tube is in a straight tube shape, and the tube wall is in smooth transition.
Preferably, in the active noise reduction earphone, an earcap for inserting into an ear is connected to the front end of the housing.
The active noise reduction earphone provided by the invention comprises a shell, a feedback microphone, a low-frequency loudspeaker unit, a medium-high frequency loudspeaker unit and a noise reduction circuit. The front end of the shell is provided with a sound outlet, and the feedback microphone, the low-frequency loudspeaker unit, the medium-high frequency loudspeaker unit and the noise reduction circuit are all arranged in the shell. The feedback microphone is used for picking up ambient sound, the feedback microphone is connected with the low-frequency loudspeaker unit through the noise reduction circuit, and the medium-high-frequency loudspeaker unit is not connected with the noise reduction circuit.
By applying the active noise reduction earphone provided by the invention, audio is replayed under the combined action of the low-frequency loudspeaker unit and the medium-high frequency loudspeaker unit and is transmitted out through the sound outlet. Meanwhile, the feedback microphone picks up the environmental noise in the earphone, the noise reduction circuit is connected between the feedback microphone and the low-frequency loudspeaker unit, and the medium-high-frequency loudspeaker unit is not connected in the noise reduction circuit, so the feedback microphone collects the environmental noise in the earphone and outputs a signal with the same amplitude and the opposite phase to the environmental noise to the low-frequency loudspeaker unit after being processed by the noise reduction circuit. Therefore, the active noise reduction earphone provided by the invention does not need to reduce the high-frequency amplitude by adjusting the filter, and avoids high-frequency howling in a physical mode.
In a preferred embodiment, the front end of the woofer unit has a blocking member to enclose a woofer unit front cavity with the housing, and the blocking member has an acoustic duct communicating a cavity at the front end of the blocking member and the woofer unit front cavity, and the middle and high frequency speaker unit is disposed in the cavity at the front end of the blocking member. Therefore, when the signal sent by the noise reduction circuit is returned to the low-frequency loudspeaker unit and transmitted through the front cavity of the low-frequency loudspeaker unit and the sound guide pipe, due to the viscous action of sound waves in the sound guide pipe, heat loss generated during the transmission of the front cavity of the low-frequency loudspeaker unit and the sound guide pipe and the like, great loss is generated on high frequency, the high frequency is further attenuated, the high-frequency cut-off frequency is reduced, and high-frequency howling is better avoided. In conclusion, after the high frequency is attenuated when the signal processed and output by the noise reduction circuit is emitted by the low-frequency loudspeaker unit, the emitted sound is attenuated again when passing through the front cavity of the low-frequency loudspeaker unit and the sound guide pipe, so that the high-frequency amplitude is reduced physically better, and the high-frequency howling is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of an active noise reduction earphone according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic diagram illustrating a feedback noise reduction principle of the active noise reduction earphone in fig. 1.
The drawings are numbered as follows:
the loudspeaker comprises a shell 1, a feedback microphone 2, a low-frequency loudspeaker unit 3, a medium-high frequency loudspeaker unit 4, a sound outlet 5, a baffle part 6, a low-frequency loudspeaker unit front cavity 7, a sound guide pipe 8, an earmuff 9 and a low-frequency loudspeaker unit rear cavity 10.
Detailed Description
The embodiment of the invention discloses an active noise reduction earphone, which is used for avoiding high-frequency howling of a feedback noise reduction earphone in a physical mode.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, fig. 1 is a schematic cross-sectional view of an active noise reduction earphone according to an embodiment of the present invention; fig. 2 is a schematic sectional view taken along line a-a in fig. 1.
In one embodiment, the active noise reduction earphone provided by the invention comprises a shell 1, a feedback microphone 2, a low-frequency loudspeaker unit 3, a medium-high frequency loudspeaker unit 4 and a noise reduction circuit.
Wherein, the front end of the shell 1 is provided with a sound outlet 5, and the feedback microphone 2, the low-frequency loudspeaker unit 3, the medium-high frequency loudspeaker unit 4 and the noise reduction circuit are all arranged in the shell 1. The casing 1 is an external structure of the active noise reduction earphone, and the shape of the casing is correspondingly set according to the type of the earphone and specific use requirements, and is not specifically limited herein. The sound outlet 5 is disposed at the front end of the housing 1, and in the relationship of the front and rear positions of the components in the housing 1, the direction close to the sound outlet 5 is the front, and the opposite direction away from the sound outlet 5 is the rear. The shape, size, and the like of the sound outlet 5 may be set as needed, and are not limited herein.
The feedback microphone 2 is disposed in the casing 1 for picking up ambient sound, that is, the feedback microphone 2 collects ambient sound received inside the earphone. A first speaker unit and a second speaker unit are arranged in the casing 1, the feedback microphone 2 is electrically connected with one of the first speaker unit and the second speaker unit through a noise reduction circuit, one of the first speaker unit and the second speaker unit is a low-frequency speaker unit 3, and the other is a medium-high frequency speaker unit 4. That is, the low frequency speaker unit 3 and the middle and high frequency speaker unit 4 are provided in the housing 1, the feedback microphone 2 is connected to the low frequency speaker unit 3 through a noise reduction circuit, and the middle and high frequency speaker unit 4 is not connected to the noise reduction circuit.
The woofer unit 3 is a speaker having a low-frequency reproduction lower limit and a low high-frequency cutoff frequency, mainly plays a low-frequency sound, and has a large mass and a high compliance of a vibration system F0Low. The medium-high frequency loudspeaker unit 4 is a loudspeaker with high low-frequency playback limit and high-frequency cut-off frequency, is mainly responsible for playing medium-high frequency sound, and has a small vibration system quality and small compliance. Specifically, the frequency range of the woofer unit 3 may be 20Hz to 3kHz, and the frequency range of the mid-high frequency speaker unit 4 may be 500Hz to 20 kHz.
The noise reduction circuit is used for receiving the signal collected by the feedback microphone 2, processing the signal and returning the processed signal to the low-frequency loudspeaker unit 3, and enabling the signal to output a signal which is the same as the noise in amplitude and opposite in phase. For the specific structure of the noise reduction circuit, please refer to the conventional noise reduction circuit configuration in the prior art, which is not described herein again.
By providing the woofer unit 3 and the midrange tweeter unit 4, audio such as music signals is reproduced by the coaction of the woofer unit 3 and the midrange tweeter unit 4. In the feedback noise reduction, please refer to fig. 3, fig. 3 is a schematic diagram of a feedback noise reduction principle of the active noise reduction earphone in fig. 1, and G is a transfer function of an acoustic channel from the low frequency speaker unit 3 to the feedback microphone 2. Since the noise reduction circuit is connected between the feedback microphone 2 and the low-frequency speaker unit 3, and the middle-high-frequency speaker unit 4 is not connected to the noise reduction circuit, that is, the noise reduction circuit is only connected to the low-frequency speaker unit 3, and is not connected to the middle-high-frequency speaker unit 4, the middle-high-frequency speaker unit 4 does not participate in feedback noise reduction. The noise reduction circuit receives the signal collected by the feedback microphone 2, processes the signal and returns the signal to the low-frequency loudspeaker unit 3, so that when the signal is output with the same amplitude and opposite phase with the noise, the high-frequency reverse sound wave can not be emitted through the low-frequency loudspeaker unit 3 to be attenuated, and the high-frequency amplitude is physically reduced.
By applying the active noise reduction earphone provided by the invention, audio is replayed under the combined action of the low-frequency loudspeaker unit 3 and the middle high-frequency loudspeaker unit 4 and is transmitted out through the sound outlet 5. Meanwhile, the feedback microphone 2 picks up the environmental noise in the earphone, because the noise reduction circuit is connected between the feedback microphone 2 and the low-frequency loudspeaker unit 3, and the middle-high-frequency loudspeaker unit 4 is not connected in the noise reduction circuit, the feedback microphone 2 collects the environmental noise in the earphone and outputs a signal with the same amplitude and the opposite phase to the environmental noise to the low-frequency loudspeaker unit 3 after being processed by the noise reduction circuit, because the low-frequency playback lower limit and the high-frequency cut-off frequency of the low-frequency loudspeaker unit 3 are low, the high-frequency reverse sound wave of the sound emitted by the low-frequency loudspeaker unit 3 is attenuated, the noise reduction is realized, and the high-frequency amplitude is reduced physically. Therefore, the active noise reduction earphone provided by the invention does not need to reduce the high-frequency amplitude by adjusting the filter, and avoids high-frequency howling in a physical mode.
Furthermore, the front end of the woofer unit 3 is provided with a blocking part 6 so as to enclose a woofer unit front cavity 7 with the casing 1, the blocking part 6 is provided with an acoustic duct 8 communicating the cavity at the front end of the blocking part 6 and the woofer unit front cavity 7, and the middle and high frequency loudspeaker unit 4 is arranged in the cavity at the front end of the blocking part 6. The acoustic duct 8 may be provided at a middle position of the baffle member 6, or may be provided at an edge of the baffle member 6. When the acoustic duct 8 is provided at the edge of the baffle member 6, it may be in a closed tubular shape, or may be in a side opening shape, and the opening abuts against the housing 1 to form a closed tubular shape.
Through the setting of baffle part 6, set up woofer unit front chamber 7 at the front end of woofer unit 3, this woofer unit front chamber 7 communicates to the cavity at baffle part 6 front end through sound pipe 8, and then communicates with sound outlet 5. When an audio signal such as a music signal is reproduced by the low-frequency speaker unit 3 and the middle-high-frequency speaker unit 4, the sound of the middle-high-frequency speaker unit 4 is not attenuated because it is located in the cavity at the front end of the baffle member 6, and the reproduction effect is not affected. When the noise reduction signal participating in the feedback noise reduction, i.e. the signal sent by the noise reduction circuit returning to the low-frequency speaker unit 3, is transmitted through the low-frequency speaker unit front cavity 7 and the sound guide tube 8, due to the viscous action of the sound wave in the sound guide tube 8, the heat loss generated during the transmission of the low-frequency speaker unit front cavity 7 and the sound guide tube 8, and the like, a great loss is generated to the high frequency, so that the high frequency is further attenuated, the high frequency cut-off frequency is reduced, and the high frequency howling is better avoided. In conclusion, after the low-frequency speaker unit 3 attenuates high frequency, the emitted sound is attenuated again when passing through the low-frequency speaker unit front cavity 7 and the sound guide tube 8, so that the high-frequency amplitude is reduced physically, the high-frequency amplitude is not required to be reduced by adjusting a filter, and high-frequency howling is avoided.
The low-frequency loudspeaker unit 3 adopts a diameter of
For example, the loudspeaker has a volume of 0.7cm at the front end3And a low frequency speaker unit front chamber 7, and is provided with a sectional area of 1mm2A 5mm long sound guide tube, a signal f transmitted through the front cavity 7 of the low frequency loudspeaker unit and the sound guide tube 8 after simulation verification0Decreasing, increasing low frequency, attenuating high frequency, decreasing cut-off frequency. And through simulation verification, the low-frequency loudspeakerThe larger the front chamber 7 of the unit, f0The lower the high frequency attenuation. The sizes of the front cavity 7 of the specific low-frequency loudspeaker unit and the sound guide pipe 8 are correspondingly set according to the actual size of the earphone and the characteristics of the low-frequency loudspeaker unit 3, and under the condition allowed by the space structure, the larger the volume of the front cavity 7 of the low-frequency loudspeaker unit is, and the better the attenuation effect on high frequency is. The smaller the cross-sectional area of the sound guide pipe 8, the longer the length, the better the attenuation effect on high frequency, and further the better the effect of preventing high frequency howling.
The specific structure of the baffle member 6 is not limited, and it is sufficient to divide the front chamber 7 of the woofer unit 3 at the front end thereof and to form the sound guide 8 thereon. Specifically, the baffle member 6 is a partition plate, that is, the baffle member 6 is a plate-shaped structure, the thickness of the specific partition plate is set according to the requirement, and the larger the thickness of the partition plate is, the longer the length of the sound guide tube 8 can be set correspondingly, so as to better attenuate the high frequency. The outer edge of the partition plate can be abutted against the inner wall of the shell 1, and particularly can be bonded with the inner wall of the shell 1 or fixedly connected with the inner wall of the shell in other modes. The partition thus encloses with the housing 1 a low frequency loudspeaker unit front chamber 7. The baffle members 6 may also take the form of block structures or other conventional shapes as desired.
Specifically, the partition is integrally formed with the housing 1. That is, the partition and the housing 1 are of an integral structure, that is, the partition is formed by extending the inner wall of the housing 1 inwards. The integrated structure is convenient to form and reliable in connection and has high structural strength. Of course, the partition and the housing 1 may be a separate structure connected by a conventional fixing connection manner as required.
In the embodiments having the blocking member 6 described above, the feedback microphone 2 is disposed in the cavity at the front end of the blocking member 6. In particular, the sound guide tube 8 can be fixed on the inner wall of the shell 1 and is positioned at the front end of the sound guide tube 8 close to the sound guide tube 8. The feedback microphone 2 is arranged in the front-end cavity, so that the ambient noise received in the earphone can be effectively picked up, and a reliable basis is provided for the noise reduction processing of the noise reduction circuit. The feedback microphone 2 can be fixed in a conventional manner in the prior art, and is not limited in detail.
Further, the middle-high frequency speaker unit 4 is fixed to the front end surface of the baffle member 6. The middle-high frequency loudspeaker unit 4 is arranged in the cavity at the front end of the blocking component 6, sound emitted by the middle-high frequency loudspeaker unit does not pass through the effect of the low-frequency loudspeaker front cavity level sound guide pipe 8, high frequency cannot be attenuated, and the middle-high frequency loudspeaker unit can be specifically installed on the front end face of the blocking component 6, so that installation and operation are facilitated. If necessary, the middle-high frequency speaker unit 4 may be fixed to the inner wall of the housing 1.
Furthermore, the front end surface of the baffle member 6 is provided with a mounting groove for mounting the middle-high frequency speaker unit 4, and the rear end of the middle-high frequency speaker unit 4 is attached to the bottom surface of the mounting groove. Through the setting of mounting groove, the location and the installation of high frequency speaker unit 4 in being convenient for, it specifically can the joint in the mounting groove. Based on the operating characteristic of well high-frequency speaker unit 4, the bottom surface installation of mounting groove can be laminated to its rear end to effectively save fore-and-aft direction's space, reserve bigger space for low frequency speaker unit front chamber 7, further promote the decay effect to the high frequency. The thickness of the mounting groove may be set to coincide with the thickness of the middle and high frequency speaker unit 4. Then well high-frequency speaker unit 4 install in it when with the edge parallel and level of mounting groove, then the mounting groove can be better support spacing to well high-frequency speaker unit 4, also make the transmission that sound that well high-frequency speaker unit 4 sent can be better, and more effectual the space of having utilized for whole overall arrangement is more compact, and structural strength is higher.
In order to ensure an efficient operation of the woofer unit 3, the rear side of the woofer unit 3 in the above embodiments is provided with a woofer unit rear chamber 10. The shape of the specific woofer unit back cavity 10 can be set as required, the size is as large as possible under the condition that the space allows, the larger the space of the woofer unit back cavity 10 is, and the working effect of the woofer unit 3 is better.
In the above embodiments each provided with the acoustic duct 8, the acoustic duct 8 is in a straight tube shape, and the tube wall is in smooth transition. The acoustic duct 8 is arranged to be in a straight tube shape, so that the acoustic duct is convenient to machine and form, and the straight tube structure enables smooth transition of the duct wall to better exert a viscous effect on acoustic waves, so that attenuation of high frequency is further improved.
Further, an ear cap 9 for insertion into an ear is attached to the front end of the housing 1. The ear muffs 9 can be covered outside the sound outlet 5, namely the ear muffs 9 are covered outside the sound outlet 5 and do not shield the normal sound outlet of the sound outlet 5. The shape of earmuff 9 can set up to be similar with the people ear shape to better laminating people ear promotes user experience. The earmuffs 9 are preferably made of soft materials, so that the earmuffs are more comfortable to wear and can be better attached to the ears of a user, and a certain passive noise reduction effect is achieved.
The battery, chip and other structures of the active noise reduction earphone can refer to the conventional active noise reduction earphone in the prior art, and are not described herein again. The battery, chip, etc. may be specifically provided at the rearmost end of the housing 1, i.e. behind the woofer unit 3, and in the case of the woofer unit rear chamber 10, it is preferably provided at the rear side of the woofer unit rear chamber 10.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An active noise reduction earphone comprises a shell (1), wherein the front end of the shell (1) is provided with a sound outlet (5), the shell (1) is internally provided with a feedback microphone (2) used for picking up environmental sound, and the active noise reduction earphone is characterized in that the shell (1) is internally provided with a low-frequency loudspeaker unit (3), a medium-high frequency loudspeaker unit (4) and a noise reduction circuit, the feedback microphone (2) is only electrically connected with the low-frequency loudspeaker unit (3) through the noise reduction circuit, the front end of the low-frequency loudspeaker unit (3) is provided with a baffle component (6) so as to form a low-frequency loudspeaker unit front cavity (7) with the shell (1) in a surrounding manner, the baffle component (6) is provided with a sound guide pipe (8) communicated with the cavity at the front end of the baffle component (6) and the low-frequency loudspeaker unit front cavity (7), the medium-high frequency loudspeaker unit (4) is arranged in the cavity at the front end of the baffle component (, the feedback microphone (2) is arranged in a cavity at the front end of the blocking component (6).
2. Active noise reducing earphone according to claim 1, characterized in that the mid-high frequency loudspeaker unit (4) is fixed to the front face of the baffle member (6).
3. The active noise reduction earphone according to claim 2, wherein the front end surface of the baffle component (6) is provided with a mounting groove for mounting the middle-high frequency speaker unit (4), and the rear end of the middle-high frequency speaker unit (4) is attached to the bottom surface of the mounting groove.
4. Active noise reduction earphone according to claim 3, characterized in that the rear side of the woofer unit (3) is provided with a woofer unit rear cavity (10).
5. Active noise reduction earphone according to claim 1, characterized in that the baffle means (6) is a baffle, the outer edge of which abuts against the inner wall of the housing (1).
6. Active noise reduction earphone according to claim 5, characterized in that the partition is integrated with the housing (1).
7. Active noise reduction earphone according to any of claims 1-6, characterized by that the sound tube (8) is straight tube-shaped with smooth transition of the tube wall.
8. Active noise reduction earphone according to claim 7, characterized in that the front end of the housing (1) is connected with an earmuff (9) for insertion into the ear.
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| CN110958519A (en) * | 2019-11-22 | 2020-04-03 | 歌尔股份有限公司 | Active noise reduction acoustic unit and sound production monomer |
| CN111134956B (en) * | 2019-12-24 | 2021-02-19 | 海宁鐵三角科技有限公司 | Noise reduction earplug |
| CN111306614A (en) * | 2020-03-03 | 2020-06-19 | 青岛海尔空调器有限总公司 | Active noise reduction air conditioner and control method thereof |
| CN114666696B (en) * | 2020-12-23 | 2023-06-06 | 华为技术有限公司 | Wireless noise reduction earphone |
| EP4102856A4 (en) * | 2021-04-23 | 2023-06-21 | Samsung Electronics Co., Ltd. | Electronic device comprising speaker and microphone |
| CN115278424A (en) * | 2021-04-29 | 2022-11-01 | Oppo广东移动通信有限公司 | Audio playing method and audio playing device |
| CN115623400B (en) * | 2022-12-16 | 2023-03-17 | 共达电声股份有限公司 | Electronic equipment |
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| CN101742382A (en) * | 2009-11-24 | 2010-06-16 | 北京中星微电子有限公司 | Active noise cancellation method and earphone |
| CN105074814A (en) * | 2013-03-14 | 2015-11-18 | 美国思睿逻辑有限公司 | Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device |
| CN104602163A (en) * | 2014-12-31 | 2015-05-06 | 歌尔声学股份有限公司 | Active noise reduction earphone, and noise reduction control method and system used on active noise reduction earphone |
| CN207560274U (en) * | 2017-11-08 | 2018-06-29 | 深圳市佳骏兴科技有限公司 | Noise cancelling headphone |
| CN108235818A (en) * | 2018-01-05 | 2018-06-29 | 万魔声学科技有限公司 | Active denoising method, equipment and earphone |
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| CN110099323A (en) | 2019-08-06 |
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