A precision frequency attenuator for headphones and headphones

Abstract

The utility model relates to earphone technical field especially, a kind of precision frequency attenuator and earphone for earphone, frequency attenuator includes support part, the inside of support part is equipped with cavity structure, cavity structure includes thick tube cavity and thin tube cavity, thick tube cavity is connected with thin tube cavity, one end of thick tube cavity extends to the upper surface of support part and forms a through-hole, through-hole is equipped with cavity cover. The utility model is based on Helmholtz resonator principle, form Helmholtz resonance cavity by specific earphone cavity structure design, utilize sound attenuation characteristic, determine attenuation range by cavity aperture and length, attenuate specific frequency by large Q value, narrow frequency band, influence range is small, the attenuation of volume is also far lower than traditional tuning net / paper scheme, the dynamic transient influence to sound is extremely small, and special attenuation tuning for non-resonant frequency can be realized, significantly improve the frequency response smoothness and hearing feeling natural degree of earphone, improve tone quality effect.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, and in particular to a precision frequency attenuator for headphones and headphones. Background Technology

[0002] In-ear headphones typically form resonance peaks in the mid-to-high frequency range. Due to variations in the speaker and cavity, the position of the resonance peak can change, resulting in a harsh or unsmooth listening experience and increased harmonic distortion.

[0003] Existing technologies typically employ high-density tuning mesh / paper to increase acoustic damping and smooth out peaks. For example, Chinese Patent Publication No. CN220693315U discloses an open-back headphone, including a first housing and a first tuning mesh. The first housing is divided by a partition to form a speaker housing and a rear acoustic cavity. The bottom surface of the first housing has a bass output hole and at least one tuning hole. A groove is provided within the first housing, having a first opening communicating with the rear acoustic cavity and a second opening communicating with the bass output hole. The first opening is positioned higher than the second opening. The groove and the inner wall of the first housing cooperate to form a bass conduit. A tuning conduit is formed between the groove and the partition, connecting the rear acoustic cavity and the tuning hole. The first tuning mesh is mounted on the first housing and covers the tuning hole. The technical solution provided by this application can effectively improve the bass effect of open-back headphones, enhance the sound quality, and provide good waterproofing. Therefore, the existing technology uses a tuning mesh to smooth out peak values ​​by increasing acoustic damping. However, this operation results in a relatively small Q-factor (Quality Factor), a wide range of influence, and an overall reduction in volume, decreasing the overall dynamic transient response of the headphones and affecting sound quality. Furthermore, the tuning mesh can only attenuate resonant peaks; it cannot attenuate specific frequencies that are not resonant peaks. Utility Model Content

[0004] Therefore, this utility model provides a precision frequency attenuator and headphones for headphones, in order to overcome the problems of poor sound quality caused by the small Q value of the overall smoothing peak operation of the tuning mesh and the inability to attenuate specific frequencies of non-resonant peaks in the prior art.

[0005] To achieve the above objectives, this utility model provides a precision frequency attenuator for headphones, including a support portion. The support portion has a cavity structure inside, which includes a coarse tube cavity and a fine tube cavity. The coarse tube cavity is connected to the fine tube cavity. One end of the coarse tube cavity extends to the upper surface of the support portion to form a through hole, and a cavity cover is provided at the through hole.

[0006] Furthermore, the end of the thicker tube away from the cavity cover is connected to one end of the thinner tube, and the other end of the thinner tube is connected to the sound tube of the earphone.

[0007] Furthermore, both the coarse tube and the fine tube are cylindrical through holes. The coarse tube is vertically arranged inside the support, and the axis of the coarse tube forms an angle with the axis of the fine tube.

[0008] Furthermore, one end of the coarse tube extending to the upper surface of the support is provided with a flared end, the cross-sectional diameter of which is larger than the cross-sectional diameter of the coarse tube.

[0009] Furthermore, the cavity cover includes an assembly part and an adjustment part, the assembly part being connected to the adjustment part, the outer diameter of the assembly part being less than or equal to the inner diameter of the flared opening and greater than the inner diameter of the coarse tube cavity, and the outer diameter of the adjustment part being less than or equal to the inner diameter of the coarse tube cavity.

[0010] Furthermore, when the cavity cover is placed over the through hole of the coarse tube cavity, the adjusting part extends into the coarse tube cavity, the assembly part is embedded into the flared end, and the assembly part is fixedly connected to the flared end.

[0011] Furthermore, sealant is filled between the assembly part and the flared opening.

[0012] Furthermore, the side of the cavity cover is provided with an external thread, and the inner surface of the coarse tube cavity is provided with an internal thread that matches the external thread.

[0013] Furthermore, the thick tube cavity is filled with acoustic material.

[0014] On the other hand, the present invention also provides an earphone, including a housing and the aforementioned frequency attenuator, wherein the frequency attenuator is disposed inside the housing, and the housing is provided with a drive cavity for placing a speaker, the drive cavity being connected to a sound tube.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention is based on the Helmholtz resonator principle. Through a specific headphone cavity structure design, namely a coarse cavity, a fine cavity, and a cavity cover, a Helmholtz resonant cavity is formed. Two through holes / cavities of different diameters are fabricated on the headphone cavity structure and are interconnected. The fine hole / cavity starts on the sound tube side and acts as a conduit, while the coarse hole / cavity starts on the headphone cavity side and forms a coarse cavity with the cavity cover. The attenuation range is determined by the cavity aperture and length, and specific frequencies are attenuated with a large Q value and narrow frequency band. The impact range is small, and the volume attenuation is much lower than that of traditional tuning mesh / paper solutions. The impact on the dynamic transients of the sound is minimal, and special attenuation tuning for non-resonant frequencies can be achieved, significantly improving the frequency response smoothness and naturalness of the sound, and enhancing the sound quality.

[0017] Furthermore, this invention utilizes a detachable / adjustable cavity cover design to dynamically bind the air column length of the resonant cavity (coarse tube cavity) to user requirements. For example, when the cavity cover is threaded, rotating the cavity cover changes the depth of the adjustment part extending into the coarse tube cavity, thereby adjusting the resonant cavity volume (equivalent to modifying the V value in the Helmholtz formula) and achieving continuous adjustment of the attenuation frequency.

[0018] Furthermore, this invention is based on the acoustic cancellation principle of the Helmholtz resonator, suppressing the target frequency through resonant energy dissipation rather than direct absorption. Since the attenuation effect targets only specific frequencies, the sound wave energy in other frequency bands is almost unaffected. Therefore, the overall volume attenuation is precisely controllable, and the phase distortion is extremely low. It eliminates harshness without sacrificing subtle details in the music, achieving maximum fidelity to the original sound through precise frequency attenuation tuning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the precision frequency attenuator and housing for headphones according to this utility model;

[0020] Figure 2 This is a top view of a precision frequency attenuator and housing for headphones according to an embodiment of the present invention;

[0021] Figure 3 for Figure 2 The AA section view is shown below;

[0022] Figure 4 for Figure 3 A schematic diagram showing the concealed cavity cover;

[0023] Figure 5 This is a schematic diagram of the cavity cover structure according to an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram showing that the axis of the coarse tube and the axis of the thin tube form a 90° angle in this utility model.

[0025] In the figure: 1. Support part; 2. Coarse tube cavity; 3. Thin tube cavity; 4. Through hole; 5. Cavity cover; 6. Sound tube; 7. Flared end; 8. Assembly part; 9. Adjustment part; 10. Housing; 11. Drive cavity; 12. Upper surface of the support part. Detailed Implementation

[0026] To make the objectives and advantages of this utility model clearer, the utility model will be further described below with reference to the embodiments; it should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0027] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Please see Figures 1-6 As shown, this utility model embodiment provides a precision frequency attenuator for headphones, including a support part 1. The support part 1 has a cavity structure inside, the cavity structure includes a thick tube cavity 2 and a thin tube cavity 3. The thick tube cavity 2 is connected to the thin tube cavity 3. One end of the thick tube cavity 2 extends to the upper surface 12 of the support part to form a through hole 4. A cavity cover 5 is provided at the through hole 4.

[0031] This invention is based on the Helmholtz resonator principle. Through a specific headphone cavity structure design, namely a coarse cavity 2, a fine cavity 3, and a cavity cover 5, a Helmholtz resonant cavity is formed. Two through holes / cavities of different diameters are fabricated on the headphone cavity structure and are interconnected. The fine hole / cavity starts on the sound tube side and acts as a conduit, while the coarse hole / cavity starts on the headphone cavity side and forms the coarse cavity 2 with the cavity cover 5. Utilizing sound attenuation characteristics, the attenuation range is determined by the cavity aperture and length. Specific frequencies are attenuated with a large Q value and narrow frequency band, resulting in a small impact range and a much lower volume attenuation than traditional tuning mesh / paper solutions. The impact on the dynamic transients of the sound is minimal, and special attenuation tuning for non-resonant frequencies can be achieved, significantly improving the frequency response smoothness and naturalness of the sound, and enhancing the sound quality.

[0032] Specifically, the end of the thick tube 2 away from the cover 5 is connected to one end of the thin tube 3, and the other end of the thin tube 3 is connected to the sound tube 6 of the earphone.

[0033] Specifically, both the coarse tube 2 and the fine tube 3 are cylindrical through holes. The coarse tube 2 is vertically arranged inside the support part 1, and the axis of the coarse tube 2 forms an angle with the axis of the fine tube 3.

[0034] In one embodiment, both the coarse tube 2 and the thin tube 3 are cylindrical.

[0035] In one embodiment, both the coarse tube 2 and the thin tube 3 are conical, with the cross-sectional diameter gradually decreasing or increasing from top to bottom (from the end of the coarse tube 2 near the cover 5 to the end of the coarse tube 2 away from the cover 5, and from the end of the thin tube 3 near the coarse tube 2 to the end of the thin tube 3 away from the coarse tube 2).

[0036] In other words, this utility model does not limit the specific shape of the coarse cavity 2 and the fine cavity 3. Any shape of the coarse cavity 2 and the fine cavity 3 that can be formed by the structural design of the coarse cavity 2, the fine cavity 3 and the cavity cover 5 to form a Helmholtz resonance cavity is within the protection scope of this utility model.

[0037] Specifically, the angle between the axis of the coarse lumen 2 and the axis of the thin lumen 3 is 0° to 90°.

[0038] In one embodiment, the axis of the coarse lumen 2 forms a 0° angle with the axis of the thin lumen 3.

[0039] As one implementation method, please refer to Figure 3 The axis of the coarse tube 2 forms an angle of 30° with the axis of the thin tube 3.

[0040] In one embodiment, the axis of the coarse lumen 2 forms a 45° angle with the axis of the thin lumen 3.

[0041] As one implementation method, please refer to Figure 6 The axis of the coarse tube 2 forms a 90° angle with the axis of the thin tube 3.

[0042] Specifically, the end of the coarse tube 2 extending to the upper surface 12 of the support is provided with a flared opening 7, and the cross-sectional diameter of the flared opening 7 is larger than the cross-sectional diameter of the coarse tube 2.

[0043] Specifically, the cavity cover 5 includes an assembly part 8 and an adjustment part 9. The assembly part 8 is connected to the adjustment part 9. The outer diameter of the assembly part 8 is less than or equal to the inner diameter of the flared opening 7 and greater than the inner diameter of the coarse tube cavity 2. The outer diameter of the adjustment part 9 is less than or equal to the inner diameter of the coarse tube cavity 2. It can be understood that the shapes of the assembly part 8 and the adjustment part 9 are matched with the shapes of the coarse tube cavity 2 and the flared opening 7.

[0044] Specifically, when the cavity cover 5 is placed over the through hole 4, the adjusting part 9 extends into the coarse tube cavity 2, the assembly part 8 is embedded into the flared end 7, and the assembly part 8 is fixedly connected to the flared end 7.

[0045] In one embodiment, the side of the adjusting part 9 and / or the assembly part 8 is provided with external threads, the inner surface of the flared end 7 and / or the coarse tube cavity 2 is provided with internal threads, and the cavity cover 5 is connected to the coarse tube cavity 2 by threads.

[0046] As another implementation, the cavity cover 5 and the coarse tube cavity 2 can also be connected by glue or welding to ensure structural stability. Before connecting by glue or welding, the length of the portion of the cavity cover 5 that extends into the coarse tube cavity 2 is adjusted to precisely control the volume of the air column in the resonance cavity, thereby achieving precise control of the attenuation frequency, smooth frequency response, and reduced harmonic distortion.

[0047] Specifically, the space between the assembly part 8 and the flared opening 7 is filled with sealant.

[0048] Specifically, the side of the cavity cover 5 is provided with external threads, and the inner surface of the coarse tube cavity 2 is provided with internal threads that are compatible with the external threads.

[0049] The attenuation characteristics of traditional tuning mesh fabrics are determined by their material density and porosity. Once cured, they cannot be adjusted, resulting in the same cavity structure only being able to adapt to a single tuning target. This invention, through the design of a detachable / adjustable cavity cover 5, dynamically binds the air column length of the resonance cavity (coarse tube cavity 2) to user needs. For example, when the cavity cover 5 is threaded, rotating the cavity cover 5 changes the depth to which the adjustment part 9 extends into the coarse tube cavity 2, thereby adjusting the resonance cavity volume (equivalent to modifying the V value in the Helmholtz equation) and achieving continuous adjustment of the attenuation frequency.

[0050] This invention is based on the acoustic cancellation principle of Helmholtz resonators, suppressing target frequencies through resonant energy dissipation rather than direct absorption. Since the attenuation effect targets only specific frequencies, the sound wave energy in other frequency bands is almost unaffected. Therefore, the overall volume attenuation is precisely controllable, and the phase distortion is extremely low. It eliminates harshness without sacrificing subtle details in the music, achieving maximum fidelity in precise frequency attenuation tuning.

[0051] Specifically, the thick tube 2 is filled with acoustic material.

[0052] In one embodiment, the acoustic material is a sponge or felt.

[0053] By filling the coarse cavity 2 with porous sound-absorbing material, the attenuation amplitude and Q value can be further controlled and fine-tuned by changing the material density or coverage. This flexibility not only simplifies the development process of existing technologies (eliminating the need for repeated mold opening and testing of tuning meshes), but also supports personalized tuning (such as preset attenuation frequencies for different music styles), or adapts to frequency offset issues caused by speaker / cavity tolerances in mass production, significantly reducing manufacturing costs and quality control difficulties.

[0054] On the other hand, the present invention also provides an earphone, including a housing 10 and the aforementioned frequency attenuator, wherein the frequency attenuator is disposed inside the housing 10, and the housing 10 is provided with a drive cavity 11 for placing a speaker, the drive cavity 11 being connected to the sound tube 6.

[0055] In one embodiment, the housing 10 and the frequency attenuator are integrally formed.

[0056] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A precision frequency attenuator for headphones, characterized in that, The device includes a support portion, the interior of which has a cavity structure. The cavity structure includes a coarse tube cavity and a fine tube cavity, the coarse tube cavity being connected to the fine tube cavity. One end of the coarse tube cavity extends to the upper surface of the support portion to form a through hole, and a cavity cover is provided at the through hole.

2. The precision frequency attenuator for headphones according to claim 1, characterized in that, The end of the thicker tube away from the cavity cover is connected to one end of the thinner tube, and the other end of the thinner tube is connected to the sound tube of the earphone.

3. The precision frequency attenuator for headphones according to claim 2, characterized in that, Both the coarse and fine tubes are cylindrical through holes. The coarse tube is vertically arranged inside the support, and the axis of the coarse tube forms an angle with the axis of the fine tube.

4. The precision frequency attenuator for headphones according to claim 3, characterized in that, The end of the thick tube extending to the upper surface of the support is provided with a flared end, and the cross-sectional diameter of the flared end is larger than the cross-sectional diameter of the thick tube.

5. The precision frequency attenuator for headphones according to claim 4, characterized in that, The cavity cover includes an assembly part and an adjustment part. The assembly part is connected to the adjustment part. The outer diameter of the assembly part is less than or equal to the inner diameter of the flared opening and greater than the inner diameter of the coarse tube cavity. The outer diameter of the adjustment part is less than or equal to the inner diameter of the coarse tube cavity.

6. The precision frequency attenuator for headphones according to claim 5, characterized in that, When the cavity cover is placed over the through hole of the coarse tube cavity, the adjusting part extends into the coarse tube cavity, the assembly part is embedded into the flared end, and the assembly part is fixedly connected to the flared end.

7. The precision frequency attenuator for headphones according to claim 6, characterized in that, The space between the assembly part and the flared opening is filled with sealant.

8. The precision frequency attenuator for headphones according to claim 1, characterized in that, The side of the cavity cover is provided with an external thread, and the inner surface of the coarse tube cavity is provided with an internal thread that matches the external thread.

9. The precision frequency attenuator for headphones according to any one of claims 1-8, characterized in that, The thick tube is filled with acoustic material.

10. An earphone, characterized in that, The device includes a housing and a frequency attenuator as described in any one of claims 1-9, wherein the frequency attenuator is disposed within the housing, and the housing has a drive cavity for housing a loudspeaker, the drive cavity being connected to a sound tube.

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