CN211909125U

CN211909125U - Active noise reduction structure and earphone thereof

Info

Publication number: CN211909125U
Application number: CN202020992452.3U
Authority: CN
Inventors: 周雪动; 刘玉诚; 郭霞云
Original assignee: Shenzhen Cannice Technology Co Ltd
Current assignee: Shenzhen Cannice Technology Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2020-11-10
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses an active noise reduction structure, which comprises a shell, a sound production unit and a feedback unit, wherein the shell is of a hollow structure; the sounding unit is transversely arranged in the hollow structure and divides the hollow structure into a front cavity and a rear cavity, and the sounding unit faces the front cavity; the feedback unit is vertically arranged in the front cavity and faces the front cavity, the sound receiving surface of the feedback unit is not aligned to the sound generating surface of the sound generating unit, and an included angle between the central axis of the sound generating surface of the sound generating unit and the central axis of the sound receiving surface of the feedback unit is 60-120 degrees; the active noise reduction structure of the utility model has good noise reduction effect, and can effectively take sound playing effect and noise reduction effect into account, thereby providing better use experience for users; the utility model also discloses an earphone of having above-mentioned structure of making an uproar falls in initiative.

Description

Active noise reduction structure and earphone thereof

Technical Field

The utility model relates to an earphone technical field especially relates to the initiative structure of making an uproar and earphone thereof of falling.

Background

The earphone is a device which is popular with people and is used for enjoying music and assisting voice communication. The earphones comprise various forms and are divided according to wearing modes, and comprise head earphones, ear-hanging earphones, in-ear earphones and the like; the wireless earphone is divided into wired earphones and wireless earphones according to the communication mode with the signal source. The basic principle of different types of headphones is to convert an audio signal into a sound wave that is perceptible to humans through loudspeakers located close to the user's ears.

Because the earphone needs to be used by being close to the ear, therefore, the earphone can form a certain degree of closed space near the ear of the user, in order to obtain better use experience, some earphones also adopt sound insulation materials such as silica gel and the like to block external noise from entering the ear of the user, so the earphones have certain noise reduction capability and can isolate partial noise of external environment, and the noise reduction mode is called as passive noise reduction in the industry. However, the passive noise reduction effect is limited, especially for low-frequency noise with strong penetration capability, the passive noise reduction can only filter a small part of the low-frequency noise, the noise reduction effect is poor, and the use experience is seriously affected.

Earphones with active noise reduction are also popular in the market, and the principle is that sound waves with the same frequency as external noise but opposite phases are generated by a noise reduction system to neutralize the noise, so that the active noise reduction effect is achieved. Practice proves that the noise reduction effect of the active noise reduction earphone can far exceed that of the passive noise reduction earphone. The active noise reduction earphone is specifically configured to add a feedback microphone in an earphone sound channel, wherein the feedback microphone is used for detecting sound waves and performing feedback calculation to determine whether the sound waves are consistent with sound played by a loudspeaker, and if the sound waves are not consistent with the sound played by the loudspeaker, interference adjustment is performed to enable next played sound to be consistent with expected played sound, so that the position of the feedback microphone in active noise reduction is very important. Limited by the existing design, the existing earphone with active noise reduction has to make certain compromise on the sound playing effect of the earphone in order to obtain a certain noise reduction effect, and the sound playing effect and the noise reduction effect cannot be taken into consideration, so that the use experience is influenced to a certain extent.

Therefore, there is a need for an active noise reduction structure and a headset thereof to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an active noise reduction structure, its noise reduction effect is good, and can effectively compromise sound broadcast effect and noise reduction effect, experiences for the user provides better use.

The utility model discloses a still another purpose provides an earphone with above-mentioned structure of making an uproar falls in initiative, and its noise reduction effect is good, can effectively compromise sound broadcast effect and noise reduction, experiences for the user provides better use.

In order to put purpose on the realization, the utility model discloses a structure of making an uproar falls in initiative, it includes casing, sound production unit and feedback unit, the casing is hollow structure, sound production unit transversely locates in the hollow structure, and will cavity structure separates formation antechamber and back chamber, the sound production unit orientation the antechamber, feedback unit is vertical to be located antechamber and orientation the antechamber, feedback unit's radio reception face is not right sound production unit's pronunciation face, just sound production unit's pronunciation face the axis with contained angle between feedback unit's the axis of sound reception face is between 60-120.

Compared with the prior art, the feedback unit of the utility model is vertically arranged in the front cavity and faces the front cavity, the sound receiving surface of the feedback unit is not right opposite to the sound emitting surface of the sound emitting unit, and the included angle between the axle wire of the sound emitting surface of the sound emitting unit and the axle wire of the sound receiving surface of the feedback unit is between 60 degrees and 120 degrees, on one hand, the influence on the reception of the noise which permeates into the external environment by the feedback unit due to the fact that the sound emitting surface of the feedback unit is right opposite to the sound emitting surface of the sound emitting unit is avoided, on the other hand, the included angle between the axle wire of the sound emitting surface of the sound emitting unit and the axle wire of the sound receiving surface of the feedback unit is between 60 degrees and 120 degrees, the feedback unit is positioned at a receiving position which compromises the sound wave which is sent by the sound emitting unit and the, thereby obtaining better noise reduction effect.

Preferably, the feedback unit is a mems microphone or a polymeric material diaphragm microphone.

Preferably, an included angle between a central axis of the sound emitting surface of the sound emitting unit and a central axis of the sound receiving surface of the feedback unit is 60-90 °.

Preferably, the housing protrudes outward to form an ear insertion portion, the ear insertion portion is provided with a sound outlet hole, and the front cavity is communicated with the external environment through the sound outlet hole.

Specifically, the ear-in part penetrates through to form a sound outlet channel, and one end of the sound outlet channel, which is far away from the front cavity, forms the sound outlet hole.

Specifically, the active noise reduction structure further comprises a noise reduction piece, and the noise reduction piece is sleeved on the ear inlet part and enables the sound outlet hole to be exposed to the external environment.

More specifically, the noise reduction piece is a silicone piece.

Preferably, the feedback unit has a stable frequency response.

Preferably, a first clamping position is transversely arranged in the shell, and the sound generating unit is installed in the first clamping position.

Preferably, the inner wall of the housing is provided with a second detent, and the feedback unit is mounted in the second detent.

Correspondingly, the utility model also discloses an earphone, it includes control circuit and as above the structure of making an uproar falls in the initiative, control circuit install in hollow structure, sound production unit and feedback unit electricity are connected respectively control circuit.

Preferably, the earphone further comprises a communication unit, and the communication unit is electrically connected with the control circuit.

Drawings

Fig. 1 is a circuit block diagram of the earphone of the present invention.

Fig. 2 is a schematic structural diagram of a preferred embodiment of the active noise reduction structure of the present invention.

Fig. 3 is a schematic structural diagram of another preferred embodiment of the active noise reduction structure of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

First embodiment

Referring to fig. 1 and 2, the earphone 1000 of the present embodiment includes a control circuit 200 and an active noise reduction structure 100, wherein the active noise reduction structure 100 includes a housing 10, a sound generating unit 20 and a feedback unit 30, the housing 10 is a hollow structure, the control circuit 200 is installed in the hollow structure, and the sound generating unit 20 and the feedback unit 30 are electrically connected to the control circuit 200 through cables, respectively. The control circuit 200 is disposed on a printed circuit board, and the printed circuit board is fixedly mounted in the hollow structure, but the printed circuit board may be mounted at other positions, such as outside the housing 10, and is not limited herein.

Referring to fig. 2, the sound generating unit 20 of the present embodiment is transversely disposed in the hollow structure, and divides the hollow structure into a front cavity 11 and a rear cavity 12, the sound generating unit 20 faces the front cavity 11, and the rear surface of the sound generating unit 20 faces the rear cavity 12, and the sound generating surface 21 faces the front cavity 11. The sound generating unit 20 is embodied as a speaker, and the sound generating unit 20 converts an audio signal into sound waves, and the sound waves are emitted from the sound emitting surface 21 of the speaker and enter the front cavity 11, and then spread outwards along the front cavity 11.

Referring to fig. 1 and 2, the feedback unit 30 of the present embodiment is vertically disposed in the front cavity 11 and faces the front cavity 11, and specifically, the back surface of the feedback unit 30 is mounted on a portion of the inner wall of the housing 10 corresponding to the front cavity 11. The sound receiving surface 31 of the feedback unit 30 is not aligned with the sound emitting surface 21 of the sound emitting unit 20, and the included angle a between the central axis of the sound emitting surface 21 of the sound emitting unit 20 and the central axis of the sound receiving surface 31 of the feedback unit 30 is between 60 degrees and 120 degrees, at this time, because the sound emitting surface 21 of the sound emitting unit 20 and the sound receiving surface 31 of the feedback unit 30 have a certain included angle, the sound waves emitted by the sound emitting unit 20 do not intensively impact the sound receiving surface 31 of the feedback unit 30, and the noise caused by the penetration of the external environment due to the excessive sound waves emitted by the sound emitting unit 20 is prevented from being ignored by the feedback unit 30, so that the feedback unit 30 can better receive the sound waves emitted by the sound emitting unit 20 and the noise caused by the penetration of the external environment simultaneously, and. The specific meaning of the embodiment that the sound receiving surface 31 is not aligned with the sound emitting surface 21 is that the projection position of the center of the feedback unit 30 on the sound emitting unit 20 is not more than 30% of the radius of the sound emitting surface 21 of the sound emitting unit 20 from the center of the sound emitting unit 20. In other preferred modes, the center of the feedback unit 30 may be projected on the sound generating unit 20 at a position not more than 10% or 5% of the radius of the sound generating surface 21 of the sound generating unit 20 from the center of the sound generating unit 20.

Specifically, the feedback unit 30 is a micro-electro-mechanical system (MEMS) microphone or a polymer diaphragm microphone, and the feedback unit 30 has a stable frequency response, so that the feedback unit 30 has a better sound receiving effect. When the feedback unit adopts the micro-electro-mechanical system microphone, compared with the diaphragm microphone made of the ECM (electro-mechanical system) polymer material, the micro-electro-mechanical system microphone has stable performance at different temperatures, can bear high-temperature reflow soldering, and has sensitivity which is not influenced by temperature, vibration, humidity and time. Because the sensitivity changes little before and after assembling, the microphone of the micro electro mechanical system can save the audio debugging cost in the manufacturing process. In addition, the MEMS microphone also has good radio frequency and electromagnetic interference suppression capability. To the utility model discloses, feedback unit 30 if the volume is too big, then can shelter from sound emitting unit 20's sound propagation to a certain extent to lead to earphone 1000's sound output effect to deteriorate. Compared with the ECM microphone, the mems microphone has another characteristic that the volume thereof can be made smaller, so that the mems microphone is more suitable for use in the present invention. Here, the MEMS microphone may be a Two wire MEMS (Two wire MEMS) microphone having Two ports. The two-wire mems microphone has a simple structure, a small volume, and a low cost, and can improve the noise reduction performance and cost advantage of the enhanced headset 1000. Of course, ECM polymeric diaphragm microphones are also suitable for use with the present invention. However, a microphone for a noise reduction headphone differs from a general microphone in frequency response characteristics, has a more stable frequency response, and in particular, its relative sensitivity remains substantially stable at different frequencies.

The feedback unit 30 monitors the sound wave emitted by the sound emitting unit 20 and the noise penetrating from the external environment, converts the sound with the sound wave and the noise into a feedback signal and transmits the feedback signal to the control circuit 200, the control circuit 200 calculates whether the feedback signal is consistent with the sound wave parameter of the sound emitting unit 20, if not, the control circuit 200 performs interference adjustment, so that the sound wave emitted by the sound emitting unit 20 next time is consistent with the expected playing sound, and active noise reduction of the earphone 1000 according to the embodiment is realized. It should be noted that, the way that the control circuit 200 of this embodiment calculates whether the feedback signal is consistent with the sound wave parameter of the sound generating unit 20 may be implemented by building a hardware circuit, or may be implemented by program control, which is not described herein again.

Preferably, in order to better consider the reception of the sound wave emitted by the sound generating unit 20 and the noise penetrating from the external environment by the feedback unit 30, when an included angle a between a central axis of the sound generating surface 21 of the sound generating unit 20 and a central axis of the sound receiving surface 31 of the feedback unit 30 is measured by a trial and error, the earphone 1000 of this embodiment can obtain a better active noise reduction effect, fig. 2 shows a schematic structural diagram of the active noise reduction structure 100 when the included angle a between the central axis of the sound generating surface 21 of the sound generating unit 20 and the central axis of the sound receiving surface 31 of the feedback unit 30 is 90 °, and the active noise reduction structure 100 at the included angle can obtain a comfortable active noise reduction effect by the trial and error.

Referring to fig. 2, the housing 10 of the present embodiment protrudes outward to form the ear insertion portion 13, the ear insertion portion 13 is opened with a sound outlet hole 131, and the front cavity 11 is communicated with the external environment such as the ear canal by the sound outlet hole 131. Preferably, the ear inlet 13 penetrates through the sound outlet channel 132, a sound outlet hole 131 is formed at an end of the sound outlet channel 132 away from the front cavity 11, and the sound outlet channel 132 is shaped like a long strip, so that the sound waves generated by the sound generating unit 20 can be transmitted along the sound outlet channel 132 for a certain distance and then enter the ear of the user through the sound outlet hole 131. Further, the active noise reduction structure 100 further includes a noise reduction member, the noise reduction member is sleeved on the ear 13 and exposes the sound outlet 131 to the external environment, the noise reduction member is preferably a silica gel member, the silica gel member can effectively block the gap between the ear 13 and the ear hole of the user, the external environment noise is better reduced, and the penetration into the front cavity 11 is better reduced, and meanwhile, the user has more comfortable experience.

Referring to fig. 2, the housing 10 of the present embodiment is transversely provided with a first detent, and the sound generating unit 20 is embedded in the first detent, so that the sound generating unit 20 is transversely installed in the housing 10. Correspondingly, the inner wall of the housing 10 is provided with a second clamping position, and the feedback unit 30 is vertically embedded in the second clamping position, preferably, the second clamping position is located at a position of the inner wall of the housing 10 corresponding to the front cavity 11 for vertical installation of the feedback unit 30, so as to achieve vertical installation of the feedback unit 30 in the housing 10.

Referring to fig. 1, the headset 1000 of the present embodiment further includes a communication unit 300, the communication unit 300 is electrically connected to the control circuit 200, and the control circuit 200 is in communication connection with an external device through the communication unit 300. The communication unit 300 of the present embodiment may perform passive communication with an external device, or may perform active communication. Specifically, when the communication unit 300 is a passive communication module such as a bluetooth module, the control circuit 200 completes communication connection with an external device through a bluetooth protocol, so that the headset 1000 of the present embodiment has a bluetooth communication function; when the communication unit 300 is an active communication module, the active communication module is communicatively connected to an external device through a cable. Of course, in another preferred embodiment, the headset 1000 includes two communication units 300, one of the two communication units 300 is a passive communication module, and the other is an active communication module, so that the headset 1000 can perform both passive communication and active communication with external devices, and the adaptability is stronger.

Second embodiment

Referring to fig. 1 and 3, the present embodiment is different from the first embodiment in an included angle a between a central axis of the sound emitting surface 21 of the sound emitting unit 20 and a central axis of the sound receiving surface 31 of the feedback unit 30. In this embodiment, an included angle a between a central axis of the sound emitting surface 21 of the sound emitting unit 20 and a central axis of the sound receiving surface 31 of the feedback unit 30 is 78 °, and a trial and error test shows that the active noise reduction structure 100 at the included angle can obtain a better active noise reduction effect.

It should be noted that when the included angle a between the central axis of the sound emitting surface 21 of the sound emitting unit 20 and the central axis of the sound receiving surface 31 of the feedback unit 30 is any one of 60 ° to 120 °, the specific configuration of the active noise reduction structure 100 is adjusted with reference to fig. 2 and 3 to meet different product production requirements, which is not described herein again.

With reference to fig. 1-3, the feedback unit 30 of the present invention is vertically disposed in the front cavity 11 and faces the front cavity 11, the sound receiving surface 31 of the feedback unit 30 is not aligned with the sound emitting surface 21 of the sound emitting unit 20, and an included angle a between a central axis of the sound emitting surface 21 of the sound emitting unit 20 and a central axis of the sound receiving surface 31 of the feedback unit 30 is between 60 ° to 120 °, on one hand, the included angle a between the central axis of the sound emitting surface 21 of the sound emitting unit 20 and the central axis of the sound receiving surface 31 of the feedback unit 30 is prevented from being aligned with the sound emitting surface 21 of the sound emitting unit 20, thereby preventing the feedback unit 30 from receiving noise penetrating into the external environment, on the other hand, the included angle a between the central axis of the sound emitting surface 21 of the sound emitting unit 20 and the central axis of the sound receiving surface 31 of the feedback unit 30 is between 60 ° to 120 °, the feedback unit 30 is located at a receiving position of the sound wave emitted by, thereby obtaining better noise reduction effect.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims

1. An active noise reduction structure, comprising:

the shell is of a hollow structure;

the sounding unit is transversely arranged in the hollow structure and divides the hollow structure into a front cavity and a rear cavity, and the sounding unit faces the front cavity;

the feedback unit is arranged in the front cavity and faces the front cavity, the sound receiving surface of the feedback unit is not aligned to the sound producing surface of the sound producing unit, and an included angle formed between the central axis of the sound producing surface of the sound producing unit and the central axis of the sound receiving surface of the feedback unit is 60-120 degrees.

2. The active noise reduction structure of claim 1, wherein: the feedback unit is a micro-electro-mechanical system microphone or a polymeric material diaphragm microphone.

3. The active noise reduction structure of claim 1, wherein: the shell protrudes outwards to form an ear entering part, the ear entering part is provided with a sound outlet hole, and the front cavity is communicated with the external environment through the sound outlet hole.

4. The active noise reduction structure of claim 3, wherein: the sound inlet part penetrates through the ear part to form a sound outlet channel, and one end of the sound outlet channel, which is far away from the front cavity, forms the sound outlet hole.

5. The active noise reduction structure of claim 3, wherein: the noise reduction piece is sleeved on the ear part and enables the sound outlet hole to be exposed to the external environment.

6. The active noise reduction structure of claim 1, wherein: the feedback unit has a stable frequency response.

7. The active noise reduction structure of claim 1, wherein: the casing transversely is equipped with first screens, sound generating unit install in first screens.

8. The active noise reduction structure of claim 1, wherein: the inner wall of casing is equipped with the second screens, the feedback unit install in the second screens.

9. An earphone, characterized by: comprising a control circuit and an active noise reduction structure according to any of claims 1-8, said control circuit being mounted within said hollow structure, said sound generating unit and feedback unit being electrically connected to said control circuit, respectively.

10. The headset as recited in claim 9, wherein: the control circuit also comprises a communication unit which is electrically connected with the control circuit.