An acoustic cavity assembly and a sound collecting device
By designing multiple sound-absorbing holes and noise-reducing grooves on the housing of the sound acquisition device, counteracting vortices are formed to reduce wind noise, solving the problem of poor sound pickup quality in windy environments and achieving more efficient wind noise resistance and sound pickup effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN BASEUS TECH CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-09
AI Technical Summary
Existing sound acquisition equipment has poor sound pickup quality and insufficient wind noise resistance in windy environments.
The acoustic cavity assembly is designed with a sound-entry area on its housing, multiple sound-absorbing holes, and a smaller aperture in the outer area than in the middle area to create counter-current vortices to reduce airflow energy. Noise reduction grooves and pickup holes are also provided inside the housing to further reduce noise.
It improves the wind noise resistance and sound pickup quality of the acoustic cavity component, reduces the interference of wind noise on the acoustic module, and improves the performance of the sound acquisition equipment.
Smart Images
Figure CN224343359U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of microphone pickup technology, and in particular to a acoustic cavity component and a sound acquisition device. Background Technology
[0002] With the continuous development of digital audio applications, the development of sound acquisition equipment needs to consider a variety of design factors. The sound pickup quality and wind noise resistance of sound acquisition equipment have become key factors in improving the performance of sound acquisition equipment. Utility Model Content
[0003] In view of this, the embodiments of this application aim to provide a acoustic cavity component and a sound acquisition device to improve the wind noise resistance of the acoustic cavity component and improve the sound pickup quality.
[0004] To achieve the above objectives, one aspect of this application provides a acoustic cavity assembly, including:
[0005] A housing, wherein the shell wall of the housing forms a sound-inlet area, the sound-inlet area forms a plurality of sound-absorbing holes, the sound-inlet area includes a middle area and an outer area, the outer area is disposed around the outer periphery of the middle area, and the diameter of the sound-absorbing holes on the outer area is smaller than the diameter of the sound-absorbing holes in the middle area;
[0006] An acoustic module is disposed within the housing and corresponds to the sound intake area.
[0007] In some embodiments, the acoustic module includes a pickup element and a noise-reducing shell. The noise-reducing shell is disposed over the sound intake area. The noise-reducing shell has a noise-reducing groove and a pickup hole. The noise-reducing groove connects the sound-absorbing hole and the pickup hole. The pickup element is disposed on the outer wall of the noise-reducing groove and located at the pickup hole.
[0008] In some embodiments, the volume of the noise reduction groove is 135 mm². 3 -185mm 3 between.
[0009] In some embodiments, the noise reduction groove is located between the pickup hole and the sound absorption hole, along the opening direction of the groove opening.
[0010] In some embodiments, the sum of the areas of the sound-absorbing holes is greater than or equal to 18 mm². 2 .
[0011] In some embodiments, the aperture of the sound-absorbing holes on the outer packaging area is between 0.65 mm and 0.8 mm.
[0012] In some embodiments, the diameter of the sound-absorbing holes in the intermediate region is between 0.9 mm and 1.05 mm.
[0013] In some embodiments, the acoustic cavity assembly includes a dustproof mesh disposed between the sound-absorbing hole and the noise-reducing groove.
[0014] In some embodiments, the sound-absorbing holes have larger diameters as they are closer to the acoustic module, along the thickness direction of the shell wall of the housing.
[0015] Another aspect of this application provides a sound acquisition device, including the acoustic cavity assembly described in any of the preceding claims.
[0016] In some embodiments, the sound acquisition device is a headset.
[0017] The acoustic cavity assembly provided in this application provides a sound-entry area formed on the shell wall of the housing. The sound-entry area is provided with multiple sound-absorbing holes. When airflow enters the housing from the outside through the sound-absorbing holes, the multiple sound-absorbing holes divide the airflow from the outside into multiple smaller airflows, which can reduce the energy of the airflow. On the other hand, by setting the aperture of the sound-absorbing holes on the outer area to be smaller than that of the sound-absorbing holes in the middle area, when airflow enters the housing from the outside through the sound-absorbing holes, the aperture of the sound-absorbing holes on the outer area is smaller and the airflow velocity is faster. The aperture of the sound-absorbing holes in the middle area is larger and the airflow velocity is slower. This forms a counter-current vortex reaction inside the housing, which can further slow down the airflow, reduce the energy of the airflow, and thus reduce the noise generated by the airflow on the acoustic module, improve the wind noise resistance of the acoustic cavity assembly, and improve the sound pickup quality. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the acoustic cavity component applied to the ear shell of a headset in one embodiment of this application;
[0019] Figure 2 This is a schematic diagram of the acoustic cavity assembly in one embodiment of this application;
[0020] Figure 3 This is an exploded view of a acoustic cavity assembly in one embodiment of this application;
[0021] Figure 4 for Figure 2 A structural diagram from another perspective;
[0022] Figure 5 for Figure 4 Partial cross-sectional view at point AA;
[0023] Figure 6 This is an exploded view of the acoustic module in one embodiment of this application;
[0024] Figure 7 This is a simulation diagram of the airflow pressure in the acoustic cavity structure composed of noise reduction groove, pickup hole and sound absorption hole.
[0025] Explanation of reference numerals in the attached figures
[0026] 10. Acoustic cavity assembly; 11. Housing; 11a. Sound inlet area; 11b. Sound absorption hole; 11c. Middle area; 11d. Outer enclosure area; 12. Acoustic module; 121. Sound pickup element; 122. Noise reduction shell; 122a. Noise reduction groove; 122b. Sound pickup hole; 123. Buffer element; 124. Dustproof mesh; 125. Circuit board. Detailed Implementation
[0027] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.
[0028] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0030] With the continuous development of digital audio applications, the development of sound acquisition equipment needs to consider a variety of design factors. The sound pickup quality and wind noise resistance of sound acquisition equipment have become key factors in improving the performance of sound acquisition equipment.
[0031] Based on the above, a first aspect of the embodiments of this application provides a acoustic cavity assembly 10, please refer to... Figures 1 to 7The acoustic cavity assembly 10 includes a housing 11 and an acoustic module 12. The housing 11 has a sound-entering region 11a formed in its shell wall. The sound-entering region 11a has a plurality of sound-absorbing holes 11b. The sound-entering region 11a includes a central region 11c and an outer region 11d. The outer region 11d surrounds the outer periphery of the central region 11c. The diameter of the sound-absorbing holes 11b on the outer region 11d is smaller than the diameter of the sound-absorbing holes 11b in the central region 11c. The acoustic module 12 is disposed within the housing 11 and corresponds to the sound-entering region 11a.
[0032] It should be noted that the acoustic cavity assembly 10 in this application can be used as part of a sound acquisition device, in which the acoustic cavity assembly 10 plays the role of collecting sound.
[0033] It is understandable that sound acquisition devices often encounter windy conditions in daily use environments. The airflow generated by the wind can easily bring noise, also known as wind noise, which can interfere with the sensitivity of the acoustic module in picking up sound.
[0034] The shell wall of the housing 11 has a sound-entering region 11a, which can be formed at any position on the outside of the housing 11, as long as the sound-absorbing hole 11b of the sound-entering region 11a can communicate with the outside of the housing 11.
[0035] The sound-absorbing hole 11b can penetrate through the shell wall of the shell 11. The diameter of a single sound-absorbing hole 11b can be the same or different along the direction in which it penetrates the shell wall.
[0036] When the airflow enters the housing 11 from the outside of the housing 11 through the sound-absorbing holes 11b, the multiple sound-absorbing holes 11b divide the airflow outside the housing 11 into multiple smaller airflows, which can reduce the energy of the airflow.
[0037] The "multiple" mentioned in the embodiments of this application refers to two or more.
[0038] The outer region 11d is set around the outer periphery of the middle region 11c, which means that the outer region 11d surrounds the middle region 11c in a complete circle.
[0039] The diameter of the sound-absorbing hole 11b on the outer region 11d is smaller than that of the sound-absorbing hole 11b in the middle region 11c. Thus, when the airflow enters the housing 11 from the outside through the sound-absorbing hole 11b, the smaller diameter of the sound-absorbing hole 11b on the outer region 11d results in a faster airflow velocity, while the larger diameter of the sound-absorbing hole 11b in the middle region 11c results in a slower airflow velocity. This creates a counter-current vortex reaction inside the housing 11, which can further slow down the airflow, reduce the energy of the airflow, and thus reduce the noise generated by the airflow on the acoustic module 12, improve the wind noise resistance of the acoustic cavity assembly 10, and improve the sound pickup quality.
[0040] The formation of opposing vortices when airflows at different velocities meet refers to the phenomenon where, when two or more airflows collide, the higher-speed airflow drives the lower-speed airflow to rotate, creating a vortex. This rotational motion is due to the principles of conservation of momentum and energy in fluid dynamics. When a high-speed airflow encounters a low-speed airflow, the momentum of the high-speed airflow is transferred to the low-speed airflow, causing it to rotate and thus forming a vortex.
[0041] The acoustic module 12 is disposed inside the housing 11 and corresponds to the sound intake area 11a. In this way, the weakened airflow can directly reach the acoustic module 12, which is beneficial for the acoustic module 12 to further weaken the airflow or pick up the sound signal.
[0042] The acoustic cavity assembly 10 provided in this application embodiment forms a sound-entry region 11a on the shell wall of the housing 11. The sound-entry region 11a is provided with multiple sound-absorbing holes 11b. When airflow enters the housing 11 from the outside through the sound-absorbing holes 11b, the multiple sound-absorbing holes 11b divide the airflow outside the housing 11 into multiple smaller airflows, which can reduce the energy of the airflow. On the other hand, by setting the aperture of the sound-absorbing holes 11b on the outer enclosure region 11d to be smaller than the aperture of the sound-absorbing holes 11b in the middle region 11c, when airflow enters the housing 11 from the outside through the sound-absorbing holes 11b, the aperture of the sound-absorbing holes 11b on the outer enclosure region 11d is smaller and the airflow velocity is faster. The aperture of the sound-absorbing holes 11b in the middle region 11c is larger and the airflow velocity is slower. This forms a counter-current vortex reaction inside the housing 11, which can further slow down the airflow, reduce the energy of the airflow, and thus reduce the noise generated by the airflow on the acoustic module 12, improve the wind noise resistance of the acoustic cavity assembly 10, and improve the sound pickup quality.
[0043] For example, the sound-entering region 11a further includes a transition region sandwiched between the intermediate region 11c and the outer region 11d. The diameter of the sound-absorbing hole 11b in the transition region is between the diameter of the sound-absorbing hole 11b in the intermediate region 11c and the diameter of the sound-absorbing hole 11b in the outer region 11d.
[0044] In some embodiments, please refer to Figures 2 to 7 The acoustic module 12 includes a pickup element 121 and a noise-reducing shell 122. The noise-reducing shell 122 covers the sound-entry area 11a. The noise-reducing shell 122 forms a noise-reducing groove 122a and a pickup hole 122b. The noise-reducing groove 122a connects the sound-absorbing hole 11b and the pickup hole 122b. The pickup element 121 is disposed on the outer wall of the noise-reducing groove 122a and located at the pickup hole 122b.
[0045] For example, the pickup hole 122b is disposed on the bottom wall or side wall of the noise reduction groove 122a.
[0046] The noise reduction groove 122a connects the sound absorption hole 11b and the sound pickup hole 122b. Specifically, the groove opening of the noise reduction groove 122a connects to multiple sound absorption holes 11b, and the sound pickup hole 122b penetrates the side wall of the noise reduction shell 122, thereby communicating with the noise reduction groove 122a.
[0047] The pickup element 121 is disposed on the outer wall of the noise reduction groove 122a and located at the pickup hole 122b. This means that the pickup element 121 is disposed on the side of the noise reduction shell 122 away from the noise reduction groove 122a, that is, the pickup element 121 is disposed outside the noise reduction groove 122a. In this way, after the airflow enters the shell 11 from the outside through the sound absorption hole 11b, it enters the noise reduction groove 122a. The airflow can rub against and attenuate the cavity wall of the noise reduction groove 122a, further reducing the airflow energy, which further weakens the airflow at the pickup hole 122b, thereby improving the sound pickup quality of the pickup element 121 outside the noise reduction groove 122a.
[0048] For example, the pickup element 121 is a microphone.
[0049] For example, the acoustic module 12 also includes a circuit board 125, which is electrically connected to the pickup element 121 and is disposed between the noise reduction housing 122 and the pickup element 121.
[0050] Please see Figure 7 The noise reduction groove 122a, the sound pickup hole 122b, and the sound absorption hole 11b constitute Figure 7 The acoustic cavity structure in the middle, with Figure 7 The acoustic cavity structure was simulated. The airflow pressure in the acoustic cavity structure is dark red at the sound pickup hole 122b and the sound absorption hole 11b, indicating that the airflow pressure is relatively high. In the noise reduction groove 122a, it is blue, white and light red, indicating that the airflow pressure is relatively low. Therefore, the noise reduction groove 122a in this application can further reduce the wind noise airflow entering from the sound absorption hole 11b and improve the sound pickup quality.
[0051] In some embodiments, the noise reduction groove 122a is located between the sound pickup hole 122b and the sound absorption hole 11b along the opening direction of the groove opening of the noise reduction groove 122a.
[0052] In other words, the pickup hole 122b is located on the bottom wall of the noise reduction groove 122a. This increases the travel distance of the wind noise airflow to the pickup hole 122b, thereby improving the noise reduction effect of the noise reduction groove 122a on the wind noise airflow.
[0053] For example, the opening direction of the noise reduction groove 122a is parallel to the thickness direction of the shell wall of the housing 11.
[0054] In some embodiments, the sum of the areas of the sound-absorbing holes 11b is greater than or equal to 18 mm. 2 .
[0055] For example, the sum of the areas of the sound-absorbing holes 11b is 18 mm. 2 18.5mm 2 19mm 2 20mm 2 21mm 2 22mm 2 23mm 2 24mm 2 25mm 2 26mm 2 27mm 2 28mm 2 29mm 2 Or 30mm 2 etc.
[0056] It should be noted that the sum of the areas of the sound-absorbing holes 11b refers to the sum of the cross-sectional areas of all the sound-absorbing holes 11b in the same sound-entry area 11a.
[0057] Thus, by setting the sum of the areas of the sound-absorbing holes 11b to be greater than or equal to 18mm... 2 This increases the cross-sectional area of the entire sound-absorbing hole 11b channel, which is beneficial for the sound signal to enter the noise reduction groove 122a evenly. At the same time, it can also disperse more airflow and increase the upper limit of wind noise resistance. For example, it can ensure that the sound capture performance is still good even when the airflow velocity outside the housing 11 is around 12m / s.
[0058] In some embodiments, please refer to Figure 2 The diameter of the sound-absorbing holes 11b on the outer packaging area 11d is between 0.65mm and 0.8mm.
[0059] For example, the diameter of the sound-absorbing hole 11b on the outer area 11d is 0.65mm, 0.68mm, 0.7mm, 0.75mm or 0.8mm, etc.
[0060] For example, the number of sound-absorbing holes 11b on the outer area 11d is 12.
[0061] In this embodiment, by setting the aperture of the sound-absorbing hole 11b on the outer packaging region 11d between 0.65mm and 0.8mm, the airflow outside the housing 11 can disperse a certain amount of energy after passing through the sound-absorbing hole 11b on the outer packaging region 11d, and the airflow entering is faster than that entering through the sound-absorbing hole 11b in the middle region 11c.
[0062] In some embodiments, please refer to Figure 2 The diameter of the sound-absorbing hole 11b in the middle region 11c is between 0.9mm and 1.05mm.
[0063] For example, the diameter of the sound-absorbing hole 11b in the middle region 11c is 0.9mm, 0.92mm, 0.95mm, 0.98mm, 1mm or 1.05mm, etc.
[0064] For example, the number of sound-absorbing holes 11b in the middle region 11c is 10.
[0065] In this embodiment, by setting the aperture of the sound-absorbing hole 11b on the middle region 11c between 0.9mm and 1.05mm, the airflow outside the housing 11 can disperse a certain amount of energy after passing through the sound-absorbing hole 11b on the middle region 11c, and the airflow entering is slower than that entering through the sound-absorbing hole 11b on the outer region 11d.
[0066] In some embodiments, the volume of the noise reduction slot 122a is 135 mm². 3 -185mm 3 between.
[0067] For example, the volume of the noise reduction slot 122a is 135 mm. 3 138mm 3 140mm 3 145mm 3 150mm 3 155mm 3 160mm 3 165mm 3 170mm 3 175mm 3 180mm 3 Or 185mm 3 etc.
[0068] Here, the volume of the noise reduction slot 122a is limited to 135mm. 3 -185mm 3 Between these points, the sum of the areas of the sound-absorbing holes 11b and the area of the sound-absorbing holes is greater than or equal to 18mm. 2 In combination, the wind noise reduction effect of the noise reduction groove 122a and the wind noise reduction effect of the sound absorption hole 11b form a two-stage wind noise attenuation, which can achieve efficient wind noise suppression and high-quality sound acquisition.
[0069] For example, the pickup element 121 is a microphone, and the noise reduction groove 122a and the sound absorption hole 11b of different sizes are set to make the frequency response curve of the microphone have better flatness performance below 3kHz, and can control its resonance peak above 10kHz.
[0070] For example, a buffer 123, such as a mesh fabric, is provided over the pickup hole 122b. This can reduce the height of the resonant peak, and the filter adjustment can enable noise reduction to fit over a wider frequency band, increasing the noise reduction bandwidth.
[0071] A resonance peak is the phenomenon where the amplitude of a system reaches its maximum value at a specific frequency. It usually occurs when the system's natural frequency is the same as or close to the external excitation frequency.
[0072] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 The acoustic cavity assembly 10 includes a dustproof mesh 124. The dustproof mesh 124 is disposed between the sound-absorbing hole 11b and the noise-reducing groove 122a.
[0073] Here, by setting a dustproof net 124 between the sound-absorbing hole 11b and the noise reduction groove 122a, the airflow entering the noise reduction groove 122a from outside the housing 11 can be slowed down, and the situation of dust and other objects entering the noise reduction groove 122a can be improved, thereby increasing the cleanliness of the noise reduction groove 122a.
[0074] In some embodiments, please refer to Figure 5 Along the thickness direction of the shell wall of the housing 11, the sound-absorbing hole 11b is larger in diameter as it gets closer to the acoustic module 12.
[0075] The sound-absorbing hole 11b is a through hole. Here, the diameter of the sound-absorbing hole 11b gradually changes, that is, from the outside of the shell 11 to the inside of the shell 11, the diameter of the sound-absorbing hole 11b gradually increases.
[0076] In this way, the airflow energy entering the interior from outside the shell 11 can be further dispersed, thereby improving the effect of reducing wind noise.
[0077] For example, the sound-absorbing hole 11b has a rounded corner at one end near the inside, which facilitates demolding of the housing 11 and makes manufacturing easier.
[0078] A second aspect of this application provides a sound acquisition device, which includes the acoustic cavity component 10 described in any of the above claims.
[0079] The sound acquisition device in this application embodiment can be any device that needs to acquire sound, such as outdoor recording equipment, smart voice assistant devices, call headsets, etc.
[0080] The sound acquisition device provided in this application embodiment has the advantages of improved wind noise resistance and improved sound pickup quality based on the advantages of the above-mentioned middle acoustic cavity component 10.
[0081] In some embodiments, the sound acquisition device is a headset; please refer to [link / reference]. Figure 1This refers to the ear shell and earcups of a headset. The headset includes the acoustic cavity assembly 10 as described above.
[0082] The headphones include an ear shell, a housing 11 of the acoustic cavity assembly 10 integrally formed with the ear shell, and an acoustic module 12 disposed inside the ear shell.
[0083] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.
[0084] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A acoustic cavity assembly, characterized in that, include: A housing, wherein the shell wall of the housing forms a sound-inlet area, the sound-inlet area forms a plurality of sound-absorbing holes, the sound-inlet area includes a middle area and an outer area, the outer area is disposed around the outer periphery of the middle area, and the diameter of the sound-absorbing holes on the outer area is smaller than the diameter of the sound-absorbing holes in the middle area; An acoustic module is disposed within the housing and corresponds to the sound intake area.
2. The acoustic cavity assembly according to claim 1, characterized in that, The acoustic module includes a pickup element and a noise reduction shell. The noise reduction shell is disposed on the sound intake area. The noise reduction shell forms a noise reduction groove and a pickup hole. The noise reduction groove connects the sound absorption hole and the pickup hole. The pickup element is disposed on the outer wall of the noise reduction groove and located at the pickup hole.
3. The acoustic cavity assembly according to claim 2, characterized in that, The volume of the noise reduction groove is 135mm². 3 -185mm 3 Between; and / or, Along the opening direction of the noise reduction groove, the noise reduction groove is located between the sound pickup hole and the sound absorption hole.
4. The acoustic cavity assembly according to claim 1, characterized in that, The sum of the areas of the sound-absorbing holes is greater than or equal to 18mm². 2 .
5. The acoustic cavity assembly according to claim 1, characterized in that, The diameter of the sound-absorbing holes on the outer packaging area is between 0.65 mm and 0.8 mm.
6. The acoustic cavity assembly according to claim 1, characterized in that, The diameter of the sound-absorbing holes in the intermediate region is between 0.9 mm and 1.05 mm.
7. The acoustic cavity assembly according to claim 2, characterized in that, The acoustic cavity assembly includes a dustproof mesh, which is disposed between the sound-absorbing hole and the noise-reducing groove.
8. The acoustic cavity assembly according to claim 1, characterized in that, Along the thickness direction of the shell wall of the housing, the diameter of the sound-absorbing hole increases as it gets closer to the acoustic module.
9. A sound acquisition device, characterized in that, Includes the acoustic cavity assembly as described in any one of claims 1-8.
10. The sound acquisition device according to claim 9, characterized in that, The sound acquisition device is a pair of headphones.