CN217063963U - Low-frequency noise-reduction earmuff and low-frequency noise-reduction earphone - Google Patents

Abstract

The application discloses earmuff and earphone of making an uproar fall in low frequency. The earmuff of making an uproar falls in low frequency includes: an ear cap skin for fitting with an ear of a user; the ear cap sponge is arranged on the lower side of the ear cap skin and is used for supporting the ear cap skin; the earmuff support, the earmuff support set up in the downside of earmuff sponge, the earmuff support is provided with leads the sound chamber, the earmuff support is provided with at least one leading tone pipe, leading tone pipe is the intercommunication lead the sound chamber and run through the switching-on cavity of earmuff support. The low-frequency sound waves which easily generate low-frequency oscillation noise are filtered by arranging the sound guide tube, so that the generation of the low-frequency oscillation noise of the earphone is reduced.

Description

Low-frequency noise-reduction earmuff and low-frequency noise-reduction earphone

Technical Field

The application relates to the technical field of earphones, in particular to a low-frequency noise reduction earmuff and a low-frequency noise reduction earphone.

Background

In the related art, since there are differences in the sizes of the skull and the ear of the user, so that there are differences in the acoustic performance of the headset when worn, when some users use the noise reduction headset, the headset is prone to generate low-frequency oscillation noise when the noise reduction function is turned on due to the noise reduction mechanism and the change in the acoustic performance.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the low-frequency noise reduction earmuff is provided, and low-frequency sound waves which easily generate low-frequency oscillation noise are filtered by arranging the sound guide tube, so that the generation of the low-frequency oscillation noise of the earphone is reduced.

The application also provides a low-frequency noise reduction earphone with the low-frequency noise reduction earmuff.

According to the low frequency noise reduction earmuff of the embodiment of the first aspect of the application, the earmuff comprises: an ear cap skin for fitting with an ear of a user; the ear cap sponge is arranged on the lower side of the ear cap skin and is used for supporting the ear cap skin; the earmuff support, the earmuff support set up in the downside of earmuff sponge, the earmuff support is provided with leads the sound chamber, the earmuff support is provided with at least one leading tone pipe, leading tone pipe is the intercommunication lead the sound chamber and run through the switching-on cavity of earmuff support.

According to the low-frequency noise reduction earmuff provided by the embodiment of the application, at least the following beneficial effects are achieved: the low-frequency sound wave which is easy to generate low-frequency oscillation noise is filtered by arranging the sound guide tube, so that the generation of the low-frequency oscillation noise of the earphone is reduced.

According to some embodiments of the application, the earmuff skin is provided with a storage groove, the storage groove is used for holding the earmuff sponge.

According to some embodiments of the application, the earcap sponge is ring-shaped and the receiving groove is an annular groove.

According to some embodiments of the application, the one end that the leading note pipe is close to leading note chamber is provided with the net cloth groove, the net cloth groove is used for installing leading note screen cloth.

According to some embodiments of the application, the earcap sponge is made of memory sponge.

According to some embodiments of the application, the earmuff support is provided with four the sound guiding tubes, four the sound guiding tubes are centrosymmetrically distributed.

A low frequency noise reducing headphone according to an embodiment of a second aspect of the application, comprising: the low frequency noise reduction earmuff of the embodiment of the first aspect; the earphone shell is connected with the earcap bracket of the low-frequency noise reduction earcap and is provided with a sound outlet hole and an air hole, and the sound outlet hole is positioned at the connection position of the earphone shell and the low-frequency noise reduction earcap; the loudspeaker is contained in the earphone shell and comprises a vibrating diaphragm, and the vibrating diaphragm is used for vibrating and sounding; the noise reduction module is contained in the earphone shell and connected with the loudspeaker, and the noise reduction module is used for eliminating noise.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

FIG. 1 is an exploded view of one embodiment of a low frequency noise reducing earmuff of the present application;

FIG. 2 is a cross-sectional view of one embodiment of an earcap support of the present application;

FIG. 3 is a schematic diagram of an embodiment of a low frequency noise reducing headset according to the present application;

fig. 4 is a noise reduction effect diagram of an embodiment of the low frequency noise reduction earmuff according to the present application.

Reference numerals:

the ear cap comprises an ear cap skin 100, an ear cap sponge 200, an ear cap support 300, a sound guide cavity 310, a sound guide tube 320 and a mesh groove 330;

low frequency noise reduction earmuff 400, earphone shell 500.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise specifically limited, terms such as set, installed, connected and the like should be understood broadly, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific contents of the technical solutions.

The low-frequency noise reduction earmuff provided by the embodiment of the application can be used for a head-wearing type mixed noise reduction earphone with an active noise reduction function. The principle of active noise reduction is to emit sound waves with completely opposite phases according to a specified noise sound wave, so that the two sound waves cancel each other when meeting, thereby eliminating the noise. Through years of development, the basic structure of the head-wearing type hybrid noise reduction earphone does not change greatly, but the functions of the head-wearing type hybrid noise reduction earphone on the wearing comfort level and the appearance structure are improved continuously. The head-mounted hybrid noise-reducing headphone includes both feedforward noise reduction and feedback noise reduction functions. The front noise reduction microphone is arranged outside the earphone to pick up and process external medium-high frequency noise. The feedback noise reduction microphone is positioned between the front cavity of the earphone and the earmuff and used for collecting and processing low-frequency noise, the collected noise is closer to the noise heard by a user, and the collected noise signals are transmitted to the processor for noise reduction processing. The feedback noise reduction microphone can also continuously detect whether the sound after noise reduction processing has residual noise, and the best noise reduction effect can be achieved by continuously comparing noise reduction for multiple times. However, the structural design of the feedback noise reduction microphone is arranged between the earmuff and the front cavity of the earphone, and the size of the earmuff and the size of the clamping force of the head wearing designed by referring to the existing specifications are difficult to satisfy all users, so when the size of the skull of a user is different from the size of the ear, the acoustic performance of the earphone is also different due to the influence of the clamping force of the head wearing and the leakage resistance of the earmuff. When part of users use the head-wearing type hybrid noise reduction earphone, the earphone is easy to generate low-frequency oscillation noise when the active noise reduction function is started due to the noise reduction mechanism and the change of the acoustic performance of the earphone.

Based on this, this application provides an earmuff and the earphone of making an uproar falls in low frequency, through setting up the low frequency sound wave that the acoustic conductance pipe filtering produced low frequency oscillation noise easily to reduce the production of earphone low frequency oscillation noise.

Some embodiments, referring to fig. 1, a low frequency noise reduction earmuff comprises: the ear cap comprises an ear cap skin 100, an ear cap sponge 200 and an ear cap support 300, wherein the ear cap skin 100 is used for being attached to the ear of a user; the ear cap sponge 200 is arranged at the lower side of the ear cap skin 100, and the ear cap sponge 200 is used for supporting the ear cap skin 100; the earcap support 300 is arranged on the lower side of the earcap sponge 200, the earcap support 300 is provided with a sound guide cavity 310, the earcap support 300 is provided with at least one sound guide tube 320, and the sound guide tube 320 is a conduction cavity which is communicated with the sound guide cavity 310 and penetrates through the earcap support 300.

The earcap sponge 200 is wrapped in the earcap skin 100 and fixed on the earcap holder 300 by glue. The earmuff sponge 200 is used for reducing the pressure on the ears of the user and improving the comfort of the user when the user uses the earphone. The sound-guiding cavity 310 is a cavity for guiding sound waves when the user uses the earphone, and is generally located in the center of the earmuff. The sound guiding tube 320 is a conducting cavity which is communicated with the sound guiding cavity 310 and penetrates through the earmuff support 300, so that the sound guiding cavity 310 is communicated with the outside of the earphone, and the low-frequency sound waves of the earphone, which are easy to generate low-frequency oscillation noise, can be filtered conveniently. The cross-sectional area and length of the sound guiding tube 320 can be adjusted according to the volume of the sound guiding cavity 310 and the parameters of the speaker.

The low-frequency noise-reducing earmuff provided by the embodiment of the application has the following beneficial effects: the sound guide tube 320 is arranged to filter low-frequency sound waves which easily generate low-frequency oscillation noise, so that the low-frequency oscillation noise of the earphone is reduced.

In some embodiments, the earcap shell 100 is provided with a receiving groove for receiving the earcap sponge 200. The earmuff sponge 200 is not generally a flat sponge but a through cavity is provided in the middle, which communicates with the sound-guiding cavity 310 of the earphone holder for conducting sound waves. It is understood that the earmuff skin 100 is not a flat skin, but only wraps around the earmuff sponge 200 to form an inwardly concave groove.

In some embodiments, the earmuff sponge 200 is ring-shaped and the receiving groove is an annular groove. In the related market, the earmuff is generally in a circular ring shape or an elliptical ring shape, so that the earmuff can be well fitted to the ear of a user and does not generate too much pressure. In one embodiment, the earcap sponge 200 may also be a cylinder, and the earcap skin 100 may also be a flat skin layer.

In some embodiments, referring to fig. 1 and 2, the end of the sound guiding tube 320 near the sound guiding cavity 310 is provided with a mesh groove 330, and the mesh groove 330 is used for installing a sound guiding mesh cloth. Because the sound guide tube 320 communicates the sound guide cavity 310 with the outside of the earphone, dust in the outside air easily enters the sound guide cavity 310 through the sound guide tube 320, so that the sound quality of the earphone is deteriorated and more noise is easily generated. Therefore, the sound guide mesh cloth is arranged at one end of the sound guide tube 320 to prevent dust from entering the earmuff, and meanwhile, the low-frequency sensitivity of the earphone can be adjusted by means of setting the thickness and the density of the sound guide mesh cloth, selecting different materials and the like.

In some embodiments, the earcap sponge 200 is made of a memory sponge. The memory sponge is polyether polyurethane foam sponge with slow rebound mechanical property, and belongs to characteristic sponge. The memory sponge has advanced performance in the mechanical aspects of absorbing impact force, reducing vibration, releasing low rebound force and the like. In addition, the memory sponge provides uniform surface pressure distribution, and the pressure at the highest point is reduced to the lowest by the surface shape of the stress relaxation adaptation external compression, so that the discomfort caused by microcirculation compression can be avoided. In this embodiment, choose for use the memory sponge as earmuff sponge 200, can alleviate the oppression sense of earphone clamping-force to user's ear for the user uses for a long time and does not also not have uncomfortable and feels.

In some embodiments, referring to fig. 2, the earcap holder 300 is provided with four sound guiding tubes 320, and the four sound guiding tubes 320 are distributed in a central symmetry manner. The four sound guiding tubes 320 are uniformly distributed around the sound guiding cavity 310, and the adjacent other sound guiding tubes 320 are perpendicular to each other, so that the structural design can uniformly and effectively filter low-frequency sound waves which easily generate low-frequency oscillation noise. In an exemplary embodiment, the number of the sound guiding tubes 320 may also be eight, and the eight sound guiding tubes 320 are distributed in a central symmetry manner with respect to the sound guiding cavity 310.

Some embodiments, referring to fig. 3, a low frequency noise reducing headphone comprises: in the low-frequency noise reduction earmuff 400, the earphone housing 500, the speaker and the noise reduction module according to any of the embodiments, the earphone housing 500 is connected to the earmuff support 300 of the low-frequency noise reduction earmuff 400, the earphone housing 500 is provided with the sound outlet and the air vent, and the sound outlet is located at the connection position between the earphone housing 500 and the low-frequency noise reduction earmuff 400; the speaker is accommodated in the earphone housing 500, and includes a vibrating diaphragm for vibrating and sounding; the noise reduction module is accommodated in the earphone housing 500, the noise reduction module is connected to the speaker, and the noise reduction module is used for eliminating noise.

It should be noted that the earphone further includes a control circuit board, and the control circuit board includes a plurality of circuit modules, such as a charging module, an audio conversion module, a user interaction module, and a processing module. The noise reduction module is also arranged on the control circuit board and connected with other modules, so that the noise reduction function is realized, and the use experience of a user is improved.

In some embodiments, the method for noise reduction using the low frequency noise reduction headphone of the above embodiments includes:

s100, acquiring the single body resonance frequency of the loudspeaker;

s200, acquiring the sound quality of the sound guide tube;

and S300, obtaining the low-frequency resonance frequency of the low-frequency noise of the earphone according to the single body resonance frequency and the acoustic mass.

For step S100, the speaker acts as a sound-producing device in the earphone, and there is also resonance in itself. The resonance frequency of the loudspeaker before being installed in the earphone is the single resonance frequency, and the resonance frequency of the loudspeaker after being installed in the earphone is the resonance frequency of the earphone, namely the low-frequency resonance frequency. The sound wave at the low frequency resonance frequency point will resonate to generate low frequency oscillation noise. The frequency value of the low frequency resonant frequency will vary with the earphone structure and material, but it is always related to the single resonant frequency of the speaker.

For step S200, the acoustic mass of the sound guiding tube 320 refers to the mass of the dielectric gas accelerated through the sound guiding tube 320 under static force without significant compression. Acoustic mass is one of the acoustic impedances that refers to the complex ratio of the pressure of a medium over an area of a wavefront to the volumetric velocity through that area. In general, in acoustic analysis, the acoustic impedance is expressed by the characteristic impedance to air. The acoustic impedance is a complex number, having real and imaginary parts, comparable to the electrical impedance. Using this analogy, the real part of the acoustic impedance is called the acoustic impedance and the imaginary part is called the acoustic reactance. Thus, the acoustic problem can be analyzed by a circuit theory method. The sound pressure is then usually regarded as an analogy to the voltage, while the volume velocity is regarded as an analogy to the current. In this way, the various parts of the acoustic circuit can be directly analogized to their corresponding electrical quantities. The acoustic resistance is related to the energy loss generated by the viscous motion of the medium gas in the pipeline, so the acoustic resistance is similar to the resistance. The acoustic mass is the mass of the portion of the dielectric gas that is displaced by acceleration under static force, but without significant compression. The acoustic mass acts as an inductance. The compliance is related to the volume of the portion of the dielectric gas that is compressed by static forces without significant mean displacement of its center of gravity, and acts as a capacitor. Both the acoustic mass and the acoustic compliance are acoustic reactance, which are analogous to inductance and capacitance, respectively.

For step S300, when the sound frequency is below the low-frequency resonance frequency, the acoustic compliance of the front cavity of the earphone is proportional to the cavity volume. The volume of the front cavity of the earphone is usually small, and the sound resistance of the front cavity of the earphone is large at the moment, so that the front cavity of the earphone can be approximate to an open circuit state in electricity, and more sound can be filtered. The acoustic impedance of the sound outlet of the front cavity of the earphone is in direct proportion to the sound frequency, and the acoustic mass of the sound outlet is in inverse proportion to the area of the sound outlet. Generally, the area of the sound outlet hole of the front cavity of the earphone is larger, so that the acoustic impedance of the sound outlet hole is very small at low frequency, the sound outlet hole is approximate to a short circuit state in electricity, and sound can be better conducted. The acoustic mass of the sound guiding duct 320 is inversely proportional to the low frequency resonance frequency, and thus the larger the acoustic mass of the sound guiding duct 320, the lower the low frequency resonance frequency, and the lower the cut-off frequency of the low frequency noise.

In some embodiments, the step of obtaining the sound quality of the sound guiding tube 320 includes:

s210, obtaining the radius of the sound outlet holes, the center distance of the sound outlet holes, the length of the sound outlet holes and the number of the sound outlet holes;

and S220, obtaining the sound quality according to the radius of the sound outlet holes, the center distance of the sound outlet holes, the length of the sound outlet holes and the number of the birth holes.

In step S210, in the present embodiment, the sound outlet holes are circular holes. The center distance of the sound outlet holes is the distance between the centers of two adjacent holes, and the length of the sound outlet holes is related to the thickness of the earphone shell 500. In an exemplary embodiment, the birth hole can also be a square hole.

For step S220, if the radius a of the sound outlet hole satisfies

Where f represents the frequency of sound passing through the sound outlet, and when the number of sound outlet is one, the sound quality calculation formula of the sound guiding tube 320 is:

in the formula (1), M _d For the acoustic mass of the sound guiding tube 320, ρ is the air density, L is the birth hole length, and a is the radius of the sound outlet hole.

When the number of the birth holes is plural, the sound quality of the sound guiding tube 320 is calculated by the following formula:

in formula (2), M _d For the sound quality of the sound guiding tube 320, ρ is the air density, L is the length of the birth hole, a is the radius of the sound outlet hole, and N is the diameter of the sound outlet holeNumber, b is the center distance of the sound outlet holes and b>2a。

In some embodiments, the step of obtaining the low-frequency resonance frequency of the low-frequency noise of the earphone according to the single body resonance frequency and the acoustic quality specifically includes:

s310, acquiring vent acoustic compliance, earmuff acoustic compliance, loudspeaker acoustic compliance and equivalent vibration area of a vibrating diaphragm of the earphone;

and S320, obtaining the low-frequency resonance frequency according to the monomer resonance frequency, the sound quality, the vent compliance, the earmuff compliance, the loudspeaker compliance and the equivalent vibration area.

For steps S310 and S320, the calculation formula of the low-frequency resonance frequency is:

in formula (3), f _l Low frequency resonance frequency, f, of the earphone after the earphone is fitted to the loudspeaker _g Is the individual resonance frequency, M, of the loudspeaker _d Is the acoustic mass of the sound-guiding duct 320, C _ah Is a sound and smooth air hole C _ar For ear muffs to be smooth, C _m And S is the equivalent vibration area of the loudspeaker diaphragm. It should be noted that the vent compliance refers to an equivalent compliance from the vent to the back cavity of the earphone.

As a specific example, referring to fig. 4, when the earmuff provided with the sound guide tube 320 is used, sound waves at frequencies below 100Hz will be significantly attenuated by the earphone, and the lower the sound wave frequency is, the stronger the attenuation effect is. Generally, the frequency of the audio frequency to be listened to by the user using the earphone is much greater than 100Hz, so that the sound guide tube 320 is arranged to filter the low-frequency noise and hardly affect the listening effect.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," or "a specific example" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (7)

1. Low frequency noise reduction earmuff, its characterized in that includes:

an ear cap skin for fitting with an ear of a user;

the ear cap sponge is arranged on the lower side of the ear cap skin and is used for supporting the ear cap skin;

the earmuff support, the earmuff support set up in the downside of earmuff sponge, the earmuff support is provided with leads the sound chamber, the earmuff support is provided with at least one leading tone pipe, leading tone pipe is the intercommunication lead the sound chamber and run through the switching-on cavity of earmuff support.

2. The low-frequency noise reduction earmuff according to claim 1, wherein the earmuff skin is provided with a receiving groove for receiving the earmuff sponge.

3. The low frequency noise reducing earmuff of claim 2, wherein the earmuff sponge is ring-shaped and the receiving groove is an annular groove.

4. The low-frequency noise reduction earmuff according to claim 1, wherein the sound guide tube is provided with a mesh groove at an end thereof near the sound guide cavity, and the mesh groove is used for mounting a sound guide mesh.

5. The low frequency noise reducing earmuff according to claim 1, wherein the earmuff sponge is made of memory sponge.

6. The low frequency noise reduction earmuff according to claim 1, wherein the earmuff support is provided with four of the sound guiding tubes, and the four sound guiding tubes are arranged in a central symmetry.

7. A low frequency noise reducing headphone, comprising:

the low frequency noise reducing earmuff of any one of claims 1 to 6;

the earphone shell is connected with the earcap bracket of the low-frequency noise reduction earcap and is provided with a sound outlet hole and an air hole, and the sound outlet hole is positioned at the connection position of the earphone shell and the low-frequency noise reduction earcap;

the loudspeaker is contained in the earphone shell and comprises a vibrating diaphragm, and the vibrating diaphragm is used for vibrating and sounding;

the noise reduction module is contained in the earphone shell and connected with the loudspeaker, and the noise reduction module is used for eliminating noise.

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