Acoustic structure and electronic device, and method for adjusting directivity of sound waves

Abstract

The embodiment of the present invention discloses an acoustic structure and an electronic device, and a method for adjusting the directivity of sound waves. The acoustic structure includes: a non-directional MIC is formed with a sound inlet hole; and a sealed cavity cover is arranged outside the non-directional MIC, and cooperates with the non-directional MIC to form a chamber, the sealed cavity is provided with a first sound inlet hole and a second sound inlet hole arranged at intervals, the first sound inlet hole is connected to the sound inlet hole through the chamber, a first sound path is formed between the first sound inlet hole and the sound inlet hole, the second sound inlet hole is connected to the sound inlet hole through the chamber, and a second sound path is formed between the second sound inlet hole and the sound inlet hole; the length of the first sound path is not equal to the length of the second sound path. The acoustic structure of this scheme achieves the purpose of using a non-directional MIC to make the sound wave have directionality after conversion through a special structure, thereby improving the signal-to-noise ratio of the received voice signal, that is, improving the call clarity and quality, and the structural design of the acoustic structure is simple, the feasibility is strong, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to an acoustic structure and electronic equipment, and a method for adjusting the directivity of sound waves. Background Art

[0002] With the continuous improvement of science and technology and people's material needs, the popularity of consumer electronic products such as headphones, smart watches, smart speakers, smart bracelets, etc. has increased significantly. In order to provide users with a better experience, these electronic products have also developed from the earliest single headphones to interact with users' information towards high-quality audio output, which inevitably involves the issue of improving call clarity.

[0003] At present, the technical means for improving call clarity in the industry mainly include the following three: first, to perform post-processing pure software algorithm debugging on the signal received by a single MIC to achieve the effect of improving call clarity, but the disadvantage is that the technical implementation of post-processing software debugging is difficult, demanding, and costly; second, to make changes to the hardware layout, that is, to use two or more MICs at the same time, and to arrange them to form a multi-MIC array structure to make the beam directional, thereby improving the received voice direction signal while weakening the signal transmitted to the MIC by the surrounding environmental noise, so as to achieve clear calls, but the disadvantage is that two or more MICs need to be used at the same time in hardware, with high manufacturing and use costs and design difficulty; third, to select a MIC that is directional in hardware, but the disadvantage is that the position of the sound hole must be redesigned in accordance with the characteristics of the MIC itself, resulting in poor compatibility when applied to various different products.

[0004] Therefore, the industry is in urgent need of an easy-to-implement and low-cost acoustic structure to improve the call clarity of electronic products. Summary of the invention

[0005] In view of this, the present invention provides an acoustic structure and electronic device, and a method for adjusting the directivity of sound waves, which are used to solve the problems in the prior art that it is difficult to improve the clarity of calls and the implementation cost is high.

[0006] To achieve one, part, or all of the above purposes or other purposes, the present invention provides an acoustic structure, which includes:

[0007] An omnidirectional MIC, wherein the omnidirectional MIC is formed with a sound inlet hole; and

[0008] A sealed cavity, wherein the sealed cavity cover is arranged on the outside of the omnidirectional MIC and cooperates with the omnidirectional MIC to form a cavity, the sealed cavity is provided with a first sound inlet hole and a second sound inlet hole which are arranged at intervals, the first sound inlet hole is connected with the sound inlet hole through the cavity, and a first sound path is formed between the first sound inlet hole and the sound inlet hole, the second sound inlet hole is connected with the sound inlet hole through the cavity, and a second sound path is formed between the second sound inlet hole and the sound inlet hole; wherein the length of the first sound path is not equal to the length of the second sound path.

[0009] Implementing the embodiments of the present invention will have the following beneficial effects:

[0010] The acoustic structure of the above scheme is applied to electronic devices, and specifically works in situations where electronic devices realize calls for users. The sound source is transmitted from the outside of the sealed cavity to the inside of the cavity, that is, the sound wave will form a first beam transmitted from the first sound inlet hole to the cavity and a second beam transmitted from the second sound inlet hole to the cavity. The first beam needs to go through the first sound path to reach the sound inlet hole of the non-directional MIC, and the second beam needs to go through the second sound path to reach the sound inlet hole of the non-directional MIC; and since the lengths of the first sound path and the second sound path are not equal, it is inevitable that the first beam and the second beam with a shorter sound path will enter the sound inlet hole first, and the other with a longer sound path will enter the sound inlet hole later. There is a time delay between the two beams reaching the sound inlet hole, and a phase difference is formed in the corresponding frequency domain. At the same time, since the first beam and the second beam come from the same sound source, the frequencies of the two beams are the same, so that the sound waves of the first beam and the second beam meet the interference condition. At this time, the two beams will pass through the corresponding first sound inlet hole and the second sound inlet hole, and then produce superimposed interference to form a directional beam that can reach the specified position. In summary, the acoustic structure of this scheme achieves the purpose of making the sound waves directional after using a non-directional MIC through a special structure conversion, thereby improving the signal-to-noise ratio of the received voice signal, that is, improving the clarity and quality of the call. In addition, the acoustic structure has a simple structural design, strong feasibility and low cost.

[0011] In one of the embodiments, the omnidirectional MIC is arranged on the first side of the sealed cavity and close to the first sound inlet hole, and the first sound inlet hole is arranged opposite to the sound inlet hole.

[0012] In one of the embodiments, the omnidirectional MIC is arranged in a central position of the sealed cavity so that the sound inlet hole is between the first sound inlet hole and the second sound inlet hole.

[0013] In one of the embodiments, the omnidirectional MIC is arranged on the second side of the sealed cavity and close to the second sound inlet hole, and the second sound inlet hole is arranged opposite to the sound inlet hole.

[0014] In one of the embodiments, the acoustic structure also includes a protrusion, which is arranged on the inner wall of the chamber; and when the omnidirectional MIC is arranged close to the first sound inlet hole, the protrusion is arranged close to the second sound inlet hole, or when the omnidirectional MIC is arranged close to the second sound inlet hole, the protrusion is arranged close to the first sound inlet hole.

[0015] In one embodiment, there are two protrusions. When the omnidirectional MIC is arranged at the first sound inlet hole and the second sound inlet hole, one of the protrusions is arranged between the first sound inlet hole and the sound inlet hole, and the other protrusion is arranged between the second sound inlet hole and the sound inlet hole.

[0016] In one embodiment, there is a hole distance H between the first sound inlet hole and the second sound inlet hole, and the hole distance H is within the range of half the wavelength of the received signal wave, and under this condition, the hole distance H takes a maximum value.

[0017] In one embodiment, the number of the second sound inlet holes is two or more, the two or more second sound inlet holes are spaced apart from the first sound inlet holes, and the hole spacing between the second sound inlet holes and the first sound inlet holes is the same or different.

[0018] In one of the embodiments, the acoustic structure also includes a PCB, the omnidirectional MIC and the sealed cavity are both arranged on the PCB, and the omnidirectional MIC includes a supply electrode and a receiving signal output electrode, and the omnidirectional MIC is electrically connected to the PCB through the supply electrode and the receiving signal output electrode.

[0019] The present application also proposes an electronic device, which comprises the acoustic structure as described above.

[0020] The acoustic structure of the above scheme is applied to electronic devices, and specifically works in situations where electronic devices realize calls for users. The sound source is transmitted from the outside of the sealed cavity to the inside of the cavity, that is, the sound wave will form a first beam transmitted from the first sound inlet hole to the cavity and a second beam transmitted from the second sound inlet hole to the cavity. The first beam needs to go through the first sound path to reach the sound inlet hole of the non-directional MIC, and the second beam needs to go through the second sound path to reach the sound inlet hole of the non-directional MIC; and since the lengths of the first sound path and the second sound path are not equal, it is inevitable that the first beam and the second beam with a shorter sound path will enter the sound inlet hole first, and the other with a longer sound path will enter the sound inlet hole later. There is a time delay between the two beams reaching the sound inlet hole, and a phase difference is formed in the corresponding frequency domain. At the same time, since the first beam and the second beam come from the same sound source, the frequencies of the two beams are the same, so that the sound waves of the first beam and the second beam meet the interference condition. At this time, the two beams will pass through the corresponding first sound inlet hole and the second sound inlet hole, and then produce superimposed interference to form a directional beam that can reach the specified position. In summary, the acoustic structure of this scheme achieves the purpose of making the sound waves directional after using a non-directional MIC through a special structure conversion, thereby improving the signal-to-noise ratio of the received voice signal, that is, improving the clarity and quality of the call. In addition, the acoustic structure has a simple structural design, strong feasibility and low cost.

[0021] In addition, the present application also proposes a method for adjusting the directivity of sound waves, which comprises the following steps:

[0022] The sound waves transmitted from the two sound inlet holes form interference conditions;

[0023] Confirm the minimum rating rate that needs to be adjusted and the direction of modification;

[0024] Input the adjustment parameters into the simulation tool to obtain the hole spacing between the two sound inlet holes and the distance between the MIC and the two sound inlet holes;

[0025] The beam directivity is corrected according to the hole spacing of the two sound inlet holes and the distance between the MIC and the two sound inlet holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] in:

[0028] Figure 1 is a schematic structural diagram of an acoustic structure of a first embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of an acoustic structure of a second embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of an acoustic structure of a third embodiment of the present invention;

[0031] Figure 4 The figure is a flowchart of the steps of the method for adjusting the directivity of sound waves described in the present invention.

[0032] Description of reference numerals:

[0033] 100. Acoustic structure; 10. Omnidirectional MIC; 11. Sound inlet hole; 20. Sealed cavity; 21. First sound inlet hole; 22. Second sound inlet hole; 30. Cavity; 40. Protrusion; 50. PCB. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 1 As shown, an acoustic structure 100 is shown in an embodiment of the present application, and the acoustic structure 100 is applied to an electronic device, and specifically works in the occasion where the electronic device enables a user to make a call. Exemplarily, the acoustic structure 100 includes: an omnidirectional MIC 10 and a sealed cavity 20 .

[0039] MIC is an abbreviation of Microphone, which specifically refers to microphone. The scientific name of microphone is microphone, which is a simple device used to pick up and transmit sound. It can convert sound signals into electrical signals, commonly known as MIC. Microphone is an unusual musical device. In essence, it is not a musical instrument, but a simple device used to pick up and transmit sound.

[0040] MIC directivity is a description of the sensitivity pattern of MIC to sounds from all directions in space, and is an important attribute of MIC. In many cases, the first consideration when choosing a MIC is its directivity, followed by other attributes of the MIC. In addition to omnidirectional MIC, other directivities are based on multi-diaphragm technology. By changing the cavity setting of the microphone head and mixing and modulating the sound signals received by the multi-diaphragm, the MIC obtains sensitivity to sounds from different directions. Most MICs are unidirectional, but some MICs can switch their directivity.

[0041] For example, the non-directional (i.e. omnidirectional) MIC mentioned in this solution means that the sensitivity of the omnidirectional MIC (Omnidirectional) to sounds coming from different angles is basically the same. The directional MIC can only output signals at certain angles, and the signals at other angles will be greatly attenuated. For example, if an omnidirectional MIC is used, if there is a noise source at 80°, the omnidirectional beam will receive all the noise; if a directional MIC is used, the directional beam will hardly receive the noise at 80°.

[0042] Please continue reading Figure 1Specifically, the omnidirectional MIC 10 in this embodiment is formed with a sound inlet hole 11; the sealed cavity 20 is covered on the outside of the omnidirectional MIC 10, and cooperates with the omnidirectional MIC 10 to form a chamber 30, the sealed cavity 20 is provided with a first sound inlet hole 21 and a second sound inlet hole 22 arranged at intervals, the first sound inlet hole 21 is connected with the sound inlet hole 11 through the chamber 30, and a first sound path is formed between the first sound inlet hole 21 and the sound inlet hole 11, the second sound inlet hole 22 is connected with the sound inlet hole 11 through the chamber 30, and a second sound path is formed between the second sound inlet hole 22 and the sound inlet hole 11; wherein the length of the first sound path is not equal to the length of the second sound path.

[0043] Specifically, the first sound path and the second sound path are given by Figure 1 Indicated by the straight arrow in .

[0044] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: the sound source is transmitted from the outside of the sealed cavity 20 to the inside of the cavity 30, that is, the sound wave will form a first beam transmitted from the first sound inlet hole 21 to the cavity 30 and a second beam transmitted from the second sound inlet hole 22 to the cavity 30. The first beam needs to go through a first sound path to reach the sound inlet hole 11 of the omnidirectional MIC 10, and the second beam needs to go through a second sound path to reach the sound inlet hole 11 of the omnidirectional MIC 10. Since the lengths of the first sound path and the second sound path are not equal, there is bound to be a second sound path. The one with a shorter sound path among the first beam and the second beam enters the sound inlet hole 11 first, and the other with a longer sound path enters the sound inlet hole 11 later. There is a time delay when the two beams arrive at the sound inlet hole 11, and a phase difference is formed in the corresponding frequency domain. At the same time, since the first beam and the second beam come from the same sound source, their frequencies are the same, so that the sound waves of the first beam and the second beam meet the interference condition. At this time, the two beams will pass through the corresponding first sound inlet hole 21 and the second sound inlet hole 22, and then produce superimposed interference to form a directional beam that can reach the specified position.

[0045] That is, the acoustic structure 100 of the present solution achieves the purpose of making the sound waves directional after the non-directional MIC 10 is converted through a special structure, thereby improving the signal-to-noise ratio of the received voice signal, that is, improving the clarity and quality of the call, and the acoustic structure 100 has a simple structural design, strong feasibility and low cost.

[0046] It can be understood that the first sound path and the second sound path mentioned above specifically refer to the distance that the sound emitted by the sound source in the external environment moves from the first sound inlet hole 21 to the sound inlet hole 11 and from the second sound inlet hole 22 to the sound inlet hole 11. The distance can be a straight line distance or a curved non-straight line distance.

[0047] In this solution, the sound source in the external environment can be regarded as a primary light source outside the sealed cavity 20. When the light waves generated by the primary light source pass through the first sound inlet hole 21 and the second sound inlet hole 22 of the sealed cavity 20, the inner side of the sealed cavity 20 can be regarded as two secondary light sources emitting light at the small holes. Since the distance between the two secondary light sources is relatively close, interference can be formed, and then light patterns alternating between light and dark can appear at specific locations. This is the principle of interference and diffraction of waves, and it is also the realization principle and basis for the sound wave structure of this application to output directional sound waves from the non-directional MIC10. It was first applied in optics.

[0048] According to actual needs, the arrangement structure of the non-directional MIC 10 in the sealed cavity 20 in this solution, that is, the relative position with the first sound inlet hole 21 and the second sound inlet hole 22, can be arranged in a variety of ways. For example, please continue to refer to Figure 1 In some embodiments, the omnidirectional MIC 10 is arranged on the first side of the sealed cavity 20 and close to the first sound inlet hole 21, and the first sound inlet hole 21 is arranged opposite to the sound inlet hole 11. Specifically, the first side can be understood as the left side of the sealed cavity 20.

[0049] Since the omnidirectional MIC10 is arranged close to the first side, the omnidirectional MIC10 is arranged closer to the first sound inlet hole 21 and farther away from the second sound inlet hole 22; at this time, the first sound path length between the first sound inlet hole 21 and the sound inlet hole 11 is short, and the second sound path length between the second sound inlet hole 22 and the sound inlet hole 11 is long. In this way, the speed at which the second beam transmitted from the second sound inlet hole 22 is transmitted into the sound inlet hole 11 will be slower than the speed at which the first beam transmitted from the first sound inlet hole 21 is transmitted into the sound inlet hole 11. Therefore, a fixed phase difference can be formed to meet the interference condition of the waves, so that the first beam and the second beam form a directional beam after superimposed interference, thereby achieving the purpose of improving the call quality.

[0050] Please continue reading Figure 3, or, in some other embodiments, the omnidirectional MIC 10 is arranged on the second side of the sealed cavity 20 and close to the second sound inlet hole 22, and the second sound inlet hole 22 is arranged opposite to the sound inlet hole 11. Since the omnidirectional MIC 10 is arranged close to the second side, the omnidirectional MIC 10 is arranged closer to the second sound inlet hole 22 and farther away from the first sound inlet hole 21; at this time, the first sound path length between the first sound inlet hole 21 and the sound inlet hole 11 is long, and the second sound path length between the second sound inlet hole 22 and the sound inlet hole 11 is short, so that the speed at which the second beam transmitted from the second sound inlet hole 22 is transmitted to the sound inlet hole 11 is faster than the speed at which the first beam transmitted from the first sound inlet hole 21 is transmitted to the sound inlet hole 11, thereby forming a fixed phase difference, satisfying the interference condition of the waves, so that the first beam and the second beam form a directional beam through superposition interference, thereby achieving the purpose of improving the call quality.

[0051] Please continue reading Figure 2 , or, in some other embodiments, the omnidirectional MIC 10 is arranged in the middle of the sealed cavity 20, so that the sound inlet hole 11 is between the first sound inlet hole 21 and the second sound inlet hole 22. In this embodiment, the omnidirectional MIC 10 can be arranged closer to the first sound inlet hole 21 or closer to the second sound inlet hole 22 according to actual needs, so as to obtain different unequal relationships between the first sound path and the second sound path. The technical effects that can be obtained are the same as those of the above two embodiments, which will not be described in detail here. The only difference is that the arrangement position of the omnidirectional MIC 10 in the cavity 30 is in the middle of the first side and the second side.

[0052] Please continue reading Figure 1 and Figure 3 In addition, based on any of the above embodiments, the acoustic structure 100 also includes a protrusion 40, which is arranged on the inner wall of the chamber 30; and when the omnidirectional MIC 10 is arranged close to the first sound inlet hole 21, the protrusion 40 is arranged close to the second sound inlet hole 22, or when the omnidirectional MIC 10 is arranged close to the second sound inlet hole 22, the protrusion 40 is arranged close to the first sound inlet hole 21.

[0053] The protrusion 40 protrudes from the inner wall of the chamber 30 and extends toward the middle of the chamber 30, so that the originally regular spatial structure of the chamber 30 is changed. Specifically, the area of ​​the chamber 30 where the protrusion 40 is close to the first sound inlet hole 21 or the second sound inlet hole 22 will form a tortuous sound channel with changing direction. Compared with the area of ​​the chamber 30 where the protrusion 40 is not arranged, the path length of the first sound path or the second sound path will be significantly lengthened, thereby forming a time delay with the beam directly transmitted into the sound inlet hole 11, which is the necessary basis for more reliably forming the interference conditions of the waves.

[0054] For example, when the omnidirectional MIC 10 is arranged directly opposite to the first sound inlet 21, and the protrusion 40 is arranged closer to the second sound inlet 22 than the omnidirectional MIC 10, the first beam transmitted from the first sound inlet 21 to the sound inlet 11 is basically a straight path, while the second beam transmitted from the second sound inlet 22 needs to move a second sound path approximately in a U shape if it is to be transmitted to the sound inlet 11. Obviously, the length of the second sound path is significantly greater than the first sound path.

[0055] Of course, the specific number and structural form of the protrusion 40 are not particularly limited. For example, in other embodiments, the protrusion 40 is provided in two, and when the non-directional MIC 10 is arranged in the first sound inlet hole 21 and the second sound inlet hole 22, one of the protrusions 40 is provided between the first sound inlet hole 21 and the sound inlet hole 11, and the other protrusion 40 is provided between the second sound inlet hole 22 and the sound inlet hole 11. By optimizing the shape and size of the protrusion 40 and the relative positions of the two protrusions 40 in the chamber 30, as long as it can be ensured that the first sound path length of the first beam movement is not equal to the second sound path length of the second beam movement to form a phase difference.

[0056] Please continue reading Figure 2 In this solution, there is an aperture distance H between the first sound inlet hole 21 and the second sound inlet hole 22, and the aperture distance H is within the range of half the wavelength of the received signal wave, and under this condition, the aperture distance H takes the maximum value. According to experimental verification, by increasing the aperture distance H, the directivity of the beam will be stronger, but the aperture distance H cannot be increased wirelessly, because when the aperture distance H is greater than half the wavelength of the received signal wave, the first beam and the second beam will not be able to interfere normally, and the interference condition of the wave cannot be formed. In other words, the aperture distance H needs to be controlled within the range of half the wavelength of the received signal wave, and under this condition, the aperture distance H preferably takes the maximum value (that is, the larger the aperture distance H, the better), so that a stronger directivity MIC can be obtained.

[0057] In addition, based on any of the above embodiments, the second sound inlet holes 22 are set to be two or more, and the two or more second sound inlet holes 22 are arranged at intervals from the first sound inlet hole 21, and the hole spacing between each second sound inlet hole 22 and the first sound inlet hole 21 is the same or different. In the above embodiments, only one first sound inlet hole 21 and one second sound inlet hole 22 are used as examples for explanation, but in fact, if the size and space of the sealed cavity 20 are sufficient, the second sound inlet holes 22 can be arranged as many as possible (that is, two or more), so that more second beams will be formed to overlap and interfere with the first beam, which has a stronger effect on the directivity correction of the sound wave and helps to obtain better call quality.

[0058] In any of the above embodiments, the omnidirectional MIC 10 may be a dynamic MIC. Since the dynamic MIC is relatively large and has electronic wires, it can be directly made into an independent chamber 30 in terms of structure. However, when the omnidirectional MIC 10 uses a smaller condenser microphone (ECM), MEMS MIC or other microphone, a carrier is required to cooperate with it to form an independent chamber 30.

[0059] Please continue reading Figures 1 to 3 In some embodiments, the acoustic structure 100 further includes a PCB 50, the omnidirectional MIC 10 and the sealed cavity 20 are both disposed on the PCB 50, and the omnidirectional MIC 10 includes a supply electrode and a receiving signal output electrode, and the omnidirectional MIC 10 is electrically connected to the PCB 50 via the supply electrode and the receiving signal output electrode. Therefore, the PCB 50 can cooperate with the omnidirectional MIC 10 such as the MEMS MIC to form an independent chamber 30, and can seal and isolate the sound waves, preventing the sound waves from other paths (such as gaps, etc.) from entering the sound inlet 11 to form a call echo, which affects the call quality.

[0060] The back supply electrodes (two positive and negative) and the receiving signal output electrodes (two positive and negative) of the omnidirectional MIC10 are fixed to the PCB50 by welding, with high connection strength and good signal transmission quality.

[0061] Please continue reading Figure 4 In addition to the above, the present application also proposes an electronic device, which includes the acoustic structure 100 as described above. The electronic device is, for example, a headset, a smart watch, a smart speaker, a smart bracelet, etc., which can be selected according to actual needs.

[0062] In addition, the present application also proposes a method for adjusting the directivity of sound waves, which comprises the following steps:

[0063] S100: The sound waves transmitted from the two sound inlet holes form interference conditions.

[0064] S200: Confirming the minimum rating rate for which the directivity needs to be adjusted and the modification direction of the directivity.

[0065] S300: Input the adjustment parameters into the simulation tool to obtain the hole distance between the two sound inlet holes and the distance between the MIC and the two sound inlet holes.

[0066] S400: Correct the beam directivity according to the hole spacing between the two sound inlet holes and the distance between the MIC and the two sound inlet holes.

[0067] It can be understood that the above-mentioned simulation tool can be simulation software, etc.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An acoustic structure, characterized in that: include: An omnidirectional MIC, wherein the omnidirectional MIC is formed with a sound inlet hole; as well as A sealed cavity, wherein the sealed cavity cover is arranged outside the omnidirectional MIC and cooperates with the omnidirectional MIC to form a cavity, the sealed cavity is provided with a first sound inlet hole and a second sound inlet hole which are arranged at intervals, the first sound inlet hole is connected with the sound inlet hole through the cavity, and a first sound path is formed between the first sound inlet hole and the sound inlet hole, the second sound inlet hole is connected with the sound inlet hole through the cavity, and a second sound path is formed between the second sound inlet hole and the sound inlet hole; wherein the length of the first sound path is not equal to the length of the second sound path; The omnidirectional MIC is arranged on the first side of the sealed cavity and close to the first sound inlet hole, and the first sound inlet hole is arranged opposite to the sound inlet hole; or, the omnidirectional MIC is arranged in the middle of the sealed cavity so that the sound inlet hole is between the first sound inlet hole and the second sound inlet hole; The acoustic structure also includes a protrusion, which is arranged on the inner wall of the cavity, protruding from the inner wall of the cavity and extending toward the middle of the cavity; and when the sound inlet hole is arranged close to the first sound inlet hole, the protrusion is arranged close to the second sound inlet hole, and a region of the cavity where the protrusion is close to the second sound inlet hole forms a tortuous sound channel with a changing direction, and the first sound path is shorter than the second sound path; or when the sound inlet hole is arranged close to the second sound inlet hole, the protrusion is arranged close to the first sound inlet hole, and a region of the cavity where the protrusion is close to the first sound inlet hole forms a tortuous sound channel with a changing direction, and the second sound path is shorter than the first sound path.

2. The acoustic structure according to claim 1, characterized in that The omnidirectional MIC is arranged at the second side of the sealed cavity and is close to the second sound inlet hole, and the second sound inlet hole is arranged opposite to the sound inlet hole.

3. The acoustic structure according to claim 1, characterized in that The protrusions are provided in two numbers. When the omnidirectional MIC is arranged at the first sound inlet hole and the second sound inlet hole, one of the protrusions is provided between the first sound inlet hole and the sound inlet hole, and the other protrusion is provided between the second sound inlet hole and the sound inlet hole.

4. The acoustic structure according to claim 1, characterized in that There is a hole distance H between the first sound inlet hole and the second sound inlet hole, and the hole distance H is within the range of half the wavelength of the received signal wave, and under this condition, the hole distance H takes a maximum value.

5. The acoustic structure according to any one of claims 1 to 4, characterized in that: The number of the second sound inlet holes is two or more, the two or more second sound inlet holes are spaced apart from the first sound inlet holes, and the hole spacing between the second sound inlet holes and the first sound inlet holes is the same or different.

6. The acoustic structure according to claim 5, characterized in that The acoustic structure also includes a PCB, the omnidirectional MIC and the sealed cavity are both arranged on the PCB, and the omnidirectional MIC includes a supply electrode and a receiving signal output electrode, and the omnidirectional MIC is electrically connected to the PCB through the supply electrode and the receiving signal output electrode.

7. An electronic device, characterized in that: Comprising the acoustic structure as described in any one of claims 1 to 6 above.

8. A method for adjusting the directivity of sound waves, characterized in that: For the acoustic structure as described in any one of claims 1 to 6 above, the method for adjusting the directivity of sound waves comprises the following steps: The sound waves transmitted from the first sound inlet hole and the second sound inlet hole form interference conditions; Confirm the minimum rating rate that needs to be adjusted and the direction of modification; Input the adjustment parameters into the simulation tool to obtain the hole distance between the first sound inlet hole and the second sound inlet hole and the distance between the omnidirectional MIC and the first sound inlet hole and the second sound inlet hole; The beam directivity is corrected according to the hole distance between the first sound inlet hole and the second sound inlet hole and the distance between the omnidirectional MIC and the first sound inlet hole and the second sound inlet hole.

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