Audio modules and vehicles

Abstract

The audio module (1) and vehicle (10) relate to the field of terminal technology. The audio module (1) includes a base (13), a loudspeaker (11), and a diffuser (12). Both the loudspeaker (11) and the diffuser (12) are fastened to the base (13), and the diffuser (12) is disposed on the sound-emitting side of the loudspeaker (11). The diffuser (12) has a first inclined surface (A1) inclined toward the loudspeaker (11). In a first direction, the diffuser (12) is provided with a plurality of diffusion grooves (121) having openings located on the first inclined surface (A1). The extension direction of each diffusion groove (121) is perpendicular to the first direction, and the first direction is parallel to the base (13). The plurality of diffusion grooves (121) includes a central diffusion groove group (C1) and two lateral diffusion groove groups (C2), which are identical and symmetrically arranged on either side of the central diffusion groove group (C1) in the first direction. The central diffusion groove group (C1) corresponds to the center position of the loudspeaker (11), thereby improving horizontal sound uniformity. The maximum groove depth (d1) of the diffusion grooves (121) of the central diffusion groove group (C1) is deeper than the maximum groove depths (d2 and d3) of the diffusion grooves (121) of the lateral diffusion groove group (C2). This reduces the peak-valley phenomenon in the sound field frequency response and improves the auditory experience.

Description

Technical Field

[0001] This application relates to the field of terminal technologies, and particularly to audio modules and vehicles.

Background Art

[0002] As automotive intelligence develops rapidly, automobile manufacturers install audio modules in the vehicle cockpit to improve the auditory experience.

[0003] Currently, the audio module is arranged at the control panel or at the corner of the joint between the A-pillar and the front glass of the vehicle cockpit. When the audio module is listened to at different positions in the vehicle cockpit, the difference in sound is not large in the height direction but large in the horizontal direction. When the horizontal uniformity of the sound emitted by the audio device is not high, the auditory perception at different positions in the vehicle cockpit lacks consistency. This affects the user experience.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application provides an audio module and a vehicle to optimize the horizontal uniformity of sound and improve the user's auditory experience.

Means for Solving the Problems

[0005] According to a first aspect, the present application provides an audio module and a vehicle. The audio module may be applied to scenarios where there is a high requirement for horizontal uniformity of sound, such as a vehicle scenario. The audio module includes a base, a loudspeaker, and a diffuser. The loudspeaker and diffuser are mounted on a base, and the base can support the loudspeaker and diffuser. The loudspeaker can emit sound, and the diffuser is positioned on the sound-emitting side of the loudspeaker to diffuse the sound emitted by the loudspeaker. Specifically, the diffuser has a first inclined surface that is inclined toward the loudspeaker, and the angle between the first inclined surface and the sound-emitting surface of the loudspeaker must be acute so that the sound emitted by the loudspeaker can be projected onto the first inclined surface. In the first direction, the diffuser is provided with a plurality of diffusion grooves having openings located on a first inclined surface, the direction of extension of each diffusion groove being perpendicular to the first direction, and the first direction being parallel to the base. Since both the first inclined surface and each diffusion groove can reflect incident sound, the first inclined surface and the inner walls of each diffusion groove can form sound-reflecting diffusion surfaces. The phase of sound reflected by the diffusion surfaces changes. The phases of sound reflected by different diffusion grooves overlap or attenuate when the sounds merge, so the horizontal sound distribution changes, a diffusion effect is obtained, and the horizontal sound uniformity is improved. The plurality of diffusion grooves include a central diffusion groove group and two lateral diffusion groove groups. The two lateral diffusion groove groups are identical and are arranged symmetrically on both sides of the central diffusion groove group. The central diffusion groove group corresponds to the central position of the loudspeaker. The diffusion grooves are arranged as a left-right symmetrical structure in the first direction so that sound is distributed symmetrically in the first direction. This further improves the horizontal uniformity of sound. The maximum groove depth of the central diffusion groove group is deeper than the maximum groove depth of the lateral diffusion groove group. This structural setting reduces the peak-valley phenomenon in the sound field frequency response, thereby improving the auditory experience.

[0006] The number of diffusion grooves may be even or odd. When the number of diffusion grooves is even, the central diffusion groove group contains two identical diffusion grooves, and the distance from the two diffusion grooves to the center position of the loudspeaker is equal. When the number of diffusion grooves is odd, the central diffusion groove group contains one diffusion groove, and the center position of the diffusion groove corresponds to the center position of the loudspeaker. A larger number of diffusion grooves indicates a higher horizontal diffusion efficiency of sound by the diffuser.

[0007] The groove depth of the diffusion grooves determines the lower limit of the sound frequency emitted by the loudspeaker. In other words, the groove depth of the diffusion grooves is related to the minimum sound frequency. Specifically, the maximum groove depth of the diffusion grooves in the central diffusion groove group is less than 4.9 cm.

[0008] The inner wall of the diffusion groove includes a bottom wall and two side walls, the two side walls located on either side of the bottom wall in a first direction. Each side wall has a first side edge connected to the bottom wall and a second side edge located on a first inclined surface. It should be understood that the first side edge may be curved or straight, and the second side edge may also be curved or straight.

[0009] In some possible embodiments, both the first and second lateral edges are straight, and they are inclined by an angle between them. When the angle between the first and second lateral edges is 0°, the first and second lateral edges are parallel to each other, and the groove depth of the diffusion groove is constant at different positions. When the angle between the first and second lateral edges is greater than 0°, the groove depth of the diffusion groove changes linearly. In some cases, the angle between the first and second lateral edges is less than 60°.

[0010] In some cases, the angle between the first and second side edges of all diffusion grooves is equal, and different diffusion grooves form a more uniform appearance.

[0011] Naturally, the groove depth of the diffusion groove does not have to change linearly; that is, the second and first lateral edges do not necessarily have to form a narrow angle relationship. In this way, based on ensuring horizontal diffusion of sound, richer phase changes can be introduced into the sound, improving the auditory experience.

[0012] In some possible embodiments, the joint between the bottom wall and the side wall of the diffusion groove may be at a bend angle. In some cases, a chamfer may be provided at the joint between the bottom wall and the side wall so that a smooth transition exists between the bottom wall and the side wall.

[0013] The width of the diffusion grooves determines the upper limit of the sound frequency, and the groove depth of the diffusion grooves is related to the lower limit of the sound frequency. In the first direction, the distance between the end of one group of lateral diffusion grooves that is far from the central group of diffusion grooves and the end of the other group of lateral diffusion grooves that is far from the central group of diffusion grooves is 3.5 cm to 10 cm. The groove widths of each diffusion groove may or may not be equal. The groove length of each diffusion groove is greater than 2 cm, and the groove length of a diffusion groove is the length of the bottom wall of the diffusion groove in the direction of extension of the diffusion groove.

[0014] In the first direction, when each diffusion groove has an equal groove width, the groove width of each diffusion groove can satisfy the following conditions: w1=c air / (2×f max ) Here, w1 is the groove width of the diffusion groove, c air The speed of sound is f max This is the maximum frequency in the frequency range in which the loudspeaker operates.

[0015] In some possible embodiments, the angle between the first inclined surface and the normal to the sound-emitting surface of the loudspeaker is 30° to 70°. With this angle setting, the sound emitted by the loudspeaker after being reflected by the first inclined surface is dispersed over a narrow range in the direction perpendicular to the base, and as a result, the sound can be concentrated within the user's listening height range.

[0016] The first inclined surface may be a flat surface or a curved surface. This is not limited in this specification as long as the requirements for diffusing sound can be met.

[0017] In some possible embodiments, the included angle between the sound emitting surface of the loudspeaker and the base is 0° to 60°. This increases the possibility of the sound propagation direction. It should be understood that regardless of the angular relationship between the sound emitting surface of the loudspeaker and the base, it is necessary to meet the requirements of the above-mentioned technical solution between the first inclined surface and the sound emitting surface of the loudspeaker.

[0018] According to a second aspect, the present application provides a vehicle including a vehicle body and any audio module in the above-mentioned technical solution. Since the audio module is arranged on the vehicle body, it can provide a better acoustic sensory experience for the passengers in the vehicle.

[0019] Specifically, the audio module is arranged at the central position of the vehicle dashboard of the vehicle body, or the audio module is arranged at the corner of the joint between the A pillar and the front glass of the vehicle body.

Brief Description of the Drawings

[0020] [Figure 1] It is a curve showing the relationship between the frequency and sound pressure level of the diffused sound in the prior art. [Figure 2a] It is a diagram of the simple structure of an audio module according to an embodiment of the present application. [Figure 2b] It is a diagram of the specific structure of an audio module according to an embodiment of the present application. [Figure 2c] It is a diagram of the partial structure of an audio module according to an embodiment of the present application. [Figure 3a] It is a diagram showing that sound is emitted by the loudspeaker unit of the audio module according to an embodiment of the present application. [Figure 3b] It is a diagram of the horizontal diffusion of the diffuser of the audio module according to an embodiment of the present application. [Figure 4a] A diagram of a diffuser having an even number of diffusion grooves according to an embodiment of the present application. [Figure 4b] A diagram of a diffuser having an odd number of diffusion grooves according to an embodiment of the present application. [Figure 5a] A diagram of the distribution of the groove depth of the diffusion grooves in an audio module according to an embodiment of the present application. [Figure 5b] A diagram of the distribution of the groove depth of the diffusion grooves in an audio module according to an embodiment of the present application. [Figure 6] A curve showing the relationship between the frequency and sound pressure level of the sound of an audio module according to an embodiment of the present application. [Figure 7a] A diagram of the structure of an audio module according to an embodiment of the present application. [Figure 7b] A diagram of the cross-sectional structure of an audio module according to an embodiment of the present application. [Figure 8a] A diagram of the structure of the diffuser of an audio module according to an embodiment of the present application. [Figure 8b] A diagram of the cross-sectional structure at P-P of FIG. 8a. [Figure 9a] A diagram of the structure of the diffuser of an audio module according to an embodiment of the present application. [Figure 9b] A diagram of the cross-sectional structure at Q-Q of FIG. 9a. [Figure 10a] A diagram of the structure of the diffuser of an audio module according to an embodiment of the present application. [Figure 10b] A diagram of the cross-sectional structure at R-R of FIG. 10a. [Figure 11a] A diagram of the structure of the diffusion grooves of an audio module according to an embodiment of the present application. [Figure 11b] A diagram of the structure of the diffusion grooves of an audio module according to an embodiment of the present application. [Figure 11c] A diagram of the structure of the diffusion grooves of an audio module according to an embodiment of the present application. [Figure 11d]This is a diagram showing the structure of a diffusion groove in an audio module according to one embodiment of this application. [Figure 12] This is a diagram showing the structure of an audio module according to one embodiment of this application. [Figure 13a] This is an enlarged view of section C in Figure 12. [Figure 13b] This figure shows the structure of the first and second side edges of a diffusion groove in an audio module according to one embodiment of this application. [Figure 14] This figure shows the structure of the first and second side edges of a diffusion groove in an audio module according to one embodiment of this application. [Figure 15] This is a diagram showing the cross-sectional structure of an audio module according to one embodiment of this application. [Figure 16a] This is a diagram showing the structure of a vehicle according to one embodiment of this application. [Figure 16b] This is a diagram showing the structure of a vehicle according to one embodiment of this application. [Modes for carrying out the invention]

[0021] As intelligent technology advances, automakers are installing audio modules in vehicle cockpits to improve the auditory experience. Currently, the horizontal uniformity of sound emitted by audio modules is low, resulting in occupants experiencing different hearing at different locations within the vehicle cockpit. To improve the horizontal uniformity of sound, the sound emitted by audio modules can be diffused. Figure 1 shows a curve relating frequency and sound pressure level (SPL) of diffused sound in conventional technology. The curve is sometimes called the frequency response curve of a diffused sound field. The horizontal coordinate represents the sound frequency in Hertz (Hz), and the vertical coordinate represents the sound pressure level in Decibels (dB). The high-frequency band shown in the dashed box has clear peaks and valleys, indicating that the sound has large changes in sound intensity here. This affects the user experience.

[0022] Based on this, embodiments of the present application provide an audio module, an electronic device, and a vehicle. The audio module can improve the horizontal uniformity of high frequencies and enhance the auditory experience.

[0023] The terms used in the following embodiments are intended solely to describe specific embodiments and are not intended to limit this application. The singular terms “one,” “a,” “the,” “the foregoing,” and “this” used herein and in the claims appended to this application are intended to also include expressions such as “one or more,” unless explicitly specified in the context.

[0024] References to “one embodiment,” “some embodiments,” etc., described herein indicate that one or more embodiments of this application include certain features, structures, or characteristics described by reference to the embodiments. Therefore, phrases such as “in one embodiment,” “in some embodiments,” “in some other embodiments,” and “in other embodiments,” appearing elsewhere in this specification, do not necessarily refer to the same embodiments. Instead, unless otherwise specifically emphasized, these phrases mean “one or more embodiments, but not all.” The terms “including,” “having,” and variations thereof all mean “including, but not limited to,” unless otherwise specifically emphasized.

[0025] As shown in Figure 2a, one embodiment of the present application provides an audio module 1 that can be used in a vehicle. Figure 2a shows a left side view of a simplified diagram of the structure of the audio module 1. When the audio module 1 is installed in the vehicle cockpit, the audio module 1 has high horizontal uniformity, so any position in the cockpit can have substantially the same sound, and occupants at any position in the cockpit can have substantially the same hearing, resulting in a good auditory experience. Specifically, the audio module 1 includes a loudspeaker 11, a diffuser 12, and a base 13, both of which are located on the base 13. The loudspeaker 11 is configured to convert electrical energy into sound energy to produce sound.

[0026] As mechanical waves, sound has phase, and sound is sometimes called a sound wave. Based on the phase characteristics of sound waves, when sound waves merge, sound waves of different phases may be superimposed or attenuated. Superposition of sound waves can strengthen the sound, and attenuation of sound waves can weaken the sound. In embodiments of this application, the diffuser 12 is configured to reflect emitted sound waves. Sound waves are incident on different positions of the diffuser 12 and reflected at different angles. When the reflected sound waves merge, the sound waves are superimposed or attenuated, and the phase of the sound waves changes. The sound reflected by the diffuser 12 is more uniform in different directions. When the audio module 1 is a high-frequency module, the sound emitted by the loudspeaker 11 includes high-frequency sound. High-frequency sound is characterized by short wavelengths and strong directivity. The diffuser 12 is positioned on the sound-emitting side of the loudspeaker 11 and is configured to diffuse the sound emitted by the loudspeaker 11, improving the horizontal uniformity of the sound.

[0027] Please refer to Figure 2a. If the loudspeaker 11 has a theoretical sound emission surface B, the sound emission surface B of the loudspeaker 11 may be parallel to the base 13. Here, the sound emission surface B of the loudspeaker 11 is at the same height as the top surface of the base 13. The sound emitted by the loudspeaker 11 is a highly directional beam-shaped sound wave, and a highly directional beam-shaped sound wave is perpendicular to the surface, which may be, for example, the sound emission surface B in Figure 2a. Therefore, the sound emitted by the loudspeaker 11 can be considered to be emitted from the sound emission surface B.

[0028] The diffuser 12 is fastened to the base 13 and positioned on the sound-emitting side of the loudspeaker 11. The diffuser 12 has a first inclined surface A1 that slopes toward the loudspeaker 11. The diffuser 12 further has a bottom end surface A3 for contact with the base 13 and an upper end surface A2 away from the base 13. There is an acute angle α between the first inclined surface A1 and the sound-emitting surface B of the loudspeaker 11.

[0029] Figure 2b shows the three-dimensional structure of the audio module 1. For illustrative purposes, a three-dimensional coordinate system is defined with respect to the base 13, including a first direction X, a second direction Y, and a third direction Z. The plane including the first direction X and the second direction Y is parallel to the base 13 and also parallel to the sound emission surface B of the loudspeaker 11. The third direction Z is perpendicular to the first direction X and the second direction Y, as well as perpendicular to the base 13 and the sound emission surface B of the loudspeaker 11. The diffuser 12 is provided with a plurality of diffusion grooves 121 having openings located on the first inclined surface A1 in order to diffuse the sound emitted by the loudspeaker 11. The openings of the diffusion grooves 121 are located on the first inclined surface A1, and both ends of the diffusion grooves 121 in the longitudinal direction are the diffuser 12 They are located on the upper end surface A2 and the lower end surface A3, respectively. Since the lower end surface A3 is in contact with the base 13, the ends of the diffusion grooves 121 that are away from the upper end surface A2 are located on the base 13. Here, the first inclined surface A1 is arranged at an inclination toward the base 13, and the multiple diffusion grooves 121 are arranged in the first direction X.

[0030] The upper end surface A2 and lower end surface A3 of the diffuser 12 are merely structural descriptions of the shape of the diffuser 12 shown in Figure 2b. Only the relative positions of the upper end surface A2 and lower end surface A3 are described, and it should be understood that the features such as the shape of the surface are not limited.

[0031] Referring to Figures 2a and 2b, sound emitted by the loudspeaker 11 can be projected onto the diffuser 12, and the first inclined surface A1 and the inner walls of the multiple diffusion grooves 121 of the diffuser 12 can form a sound diffusion surface and reflect the sound. Referring to one structure of a diffusion groove 121 shown in Figure 2c, the inner wall of the diffusion groove 121 includes two side walls 1211 and a bottom wall 1212 located between the two side walls 1211. Specifically, the sound diffusion surface of the diffuser 12 includes the first inclined surface A1, the bottom wall 1212 of each diffusion groove 121, and the two side walls 1211. In the direction of extension of the diffusion groove 121, both ends of the diffusion groove 121 are located on the upper end surface A2 and the bottom end surface A3 of the diffuser 12, respectively. The length of the bottom wall 1212 in the extending direction of the diffusion groove 121 is the groove length H of the diffusion groove 121. In the first direction X, the distance between the two side walls 1211 is the groove width w1 of the diffusion groove 121, and the thickness of the partition between two adjacent diffusion grooves 121 is w2. The distance between the bottom wall 1212 and the first inclined surface A1 is the groove depth d of the diffusion groove 121. The approximate direction of the groove depth d is perpendicular to the bottom wall 1212. In the case of the diffusion groove 121, the groove depth d of the diffusion groove 121 may change in the extending direction of the diffusion groove 121. In the diffusion groove 121 shown in Figure 2c, the groove depth d in the extending direction of the diffusion groove 121 does not change.

[0032] Referring to Figures 2a to 2c, the multiple diffusion grooves 121 are arranged in a first direction X, the first direction X is parallel to the base 13, and the direction of extension of each diffusion groove 121 is perpendicular to the first direction X. Here, an example of the number of diffusion grooves 121 is 6. Sound emitted from the loudspeaker 11 is projected onto the first inclined surface A1, and the first inclined surface A1 can reflect the sound. The sound emitted by the loudspeaker 11 enters the diffusion grooves 121, and the inner walls of the diffusion grooves 121 can reflect the sound and change its phase, so that diffusion grooves 121 at different positions can change the phase of the sound. The sound emitted by the loudspeaker 11 may be diffused under the bonding action between the diffusion surface including the first inclined surface A1 and the inner walls of the multiple diffusion grooves 121. Since the diffusion grooves 121 are arranged in a first direction X and the base 13 is configured to support the loudspeaker 11 and the diffuser 12, the first direction X may be considered to be approximately horizontal. In this case, the diffusion grooves 121 can enable different phase changes of sound in the horizontal direction, achieve horizontal sound diffusion, and improve the uniformity of sound in the horizontal direction.

[0033] Figure 3a shows the three-dimensional structure of audio module 1 from a different angle. Sound emitted by loudspeaker 11 is emitted into each diffusion groove 121, and the diffusion groove 121 changes the phase of the sound. Furthermore, as shown in Figure 3b, the sound processed by the diffusion groove 121 is interactive, and evenly diffused reflected sound is generated in the horizontal direction, resulting in even distribution of sound in the horizontal direction. This improves the horizontal uniformity of the sound.

[0034] Specifically, Figure 3b shows a top view of the audio module 1, that is, a view of the audio module 1 as seen from directly above the base 13. The multiple diffusion grooves 121 include a central diffusion groove group C1 and two lateral diffusion groove groups C2. The two lateral diffusion groove groups C2 are identical and are symmetrically arranged on both sides of the central diffusion groove group C1 in the first direction X. Since the central diffusion groove group C1 and the lateral diffusion groove groups C2 are divided based on their relative positions to the loudspeaker 11, the multiple diffusion grooves 121 have a left-right symmetrical structure. The central diffusion groove group C1 corresponds to the central position of the loudspeaker 11, and the distance over which sound emitted by the loudspeaker 11 reaches the central diffusion groove group C1 is shortest. It will be understood that the left-right symmetry here is based on the first direction X. For the central plane of the multiple symmetrical diffusion grooves 121, please refer to the center of the loudspeaker 11, as the center of the loudspeaker 11 is located on the central plane. Sound emitted from the loudspeaker 11 is emitted into the diffusion grooves 121, and after the phase of the sound is changed by the diffusion grooves 121, it is diffused. Since the multiple diffusion grooves 121 are arranged symmetrically, the diffused sound can also be symmetrical in the horizontal plane. This further improves the horizontal uniformity. That is, since the sound emitted from the loudspeaker 11 is diffused by the diffuser 12 and then uniformly distributed horizontally, the horizontal uniformity of the sound can be improved.

[0035] The audio module 1 provided in this embodiment of the present application has wider directivity in the horizontal direction, stronger auditory coherence at different angular positions, and brighter and clearer high frequencies. Tests and comparisons show that the horizontal uniformity of sound obtained after diffusion by the diffuser 12 is improved by 35.9% compared to the horizontal uniformity of sound from existing audio modules and by 7.5% compared to the horizontal uniformity of sound from acoustic prisms.

[0036] In the audio module 1 provided in the embodiments of this application, the number of diffusion grooves 121 on the diffuser 12 is not limited. However, based on the configuration of the central diffusion groove group C1 and the lateral diffusion groove groups C2 symmetrically arranged on both sides of the central diffusion groove group C1, there are at least three diffusion grooves 121. When the number of diffusion grooves 121 is even, the central diffusion groove group C1 includes two identical diffusion grooves 121, and the distance from the two diffusion grooves 121 to the center position of the loudspeaker 11 is equal. When the number of diffusion grooves 121 is even, the central diffusion groove group C1 includes one diffusion groove 121.

[0037] For example, Figure 4a is a front view of the audio module 1, that is, a view of the audio module 1 from a viewpoint parallel to the base 13 and from which the diffusion grooves 121 can be observed. The audio module 1 has six diffusion grooves 121, and the central diffusion groove group C1 contains two identical diffusion grooves 121, with the distance from the two diffusion grooves 121 to the center of the loudspeaker 11 being equal. One of the lateral diffusion groove groups C2 contains two diffusion grooves 121, and the diffusion grooves 121 of the two lateral diffusion groove groups C2 are symmetrical with respect to the central diffusion groove group C1. The two diffusion grooves 121 of the central diffusion groove group C1 have the same center distance to the loudspeaker 11, and this center distance is shorter than the center distance to the loudspeaker 11 of the other diffusion grooves 121. Here, the distance from the center of the diffusion groove 121 to the loudspeaker 11 is the distance from the center of the opening of the diffusion groove 121 on the first inclined surface A1 to the center of the loudspeaker 11.

[0038] In another embodiment, Figure 4b is a front view of the audio module 1, i.e., a view of the audio module 1 from a viewpoint parallel to the base 13 and from which the diffusion grooves 121 can be observed. In Figure 4b, there are five diffusion grooves 121, with the central diffusion groove group C1 containing one diffusion groove 121, which corresponds to the center position of the loudspeaker 11. Either of the lateral diffusion groove groups C2 contains two diffusion grooves 121, and the diffusion grooves 121 of the two lateral diffusion groove groups C2 are symmetrical with respect to the central diffusion groove group C1. The diffusion grooves 121 of the central diffusion groove group C1 have the same center distance to the loudspeaker 11, and this center distance is shorter than the center distance to the loudspeaker 11 of the other diffusion grooves 121. Here, the center distance to the loudspeaker 11 of the diffusion groove 121 is the distance from the center of the opening of the diffusion groove 121 on the first inclined surface A1 to the center of the loudspeaker 11.

[0039] According to the audio module 1 provided in this application, in order to optimize the frequency response curve of the sound field and prevent obvious peaks and valleys, the maximum groove depth of the central diffusion groove group C1 is set to be greater than the maximum groove depth of the lateral diffusion groove group C2. Specifically, the maximum groove depth of the diffusion groove 121 in the central diffusion groove group C1 may be less than 4.9 cm, for example, 4.5 cm, 3 cm, or 2 cm. Lateral diffusion groove group The maximum groove depth of the diffusion groove 121 in C2 is smaller than the maximum groove depth of the diffusion groove 121 in the central diffusion groove group C1. Referring to Figure 2c, the maximum groove depth of the diffusion groove 121 is the groove depth d that is furthest from the bottom wall 1212 of the diffusion groove 121 to the first inclined surface A1. Figures 5a and 5b show a top view of the diffuser 12, i.e., the structure of the diffuser 12 observed perpendicular to the top of the base 13. An example in which the groove depth d of each diffusion groove 121 does not change in the direction of extension of the diffusion groove 121 is used to describe the diffuser 12.

[0040] In Figure 5a, an even number of diffusion grooves 121 are used as an example for explanation. The diffusion grooves 121 in the central diffusion groove group C1 have a groove depth d1, the diffusion groove 121 in the lateral diffusion groove group C2 that is furthest from the central diffusion groove group C1 has a groove depth d2, and the diffusion grooves 121 in the lateral diffusion groove group C2 that are adjacent to the central diffusion groove group C1 have a groove depth d3. The diffusion grooves 121 in the central diffusion groove group C1 have the deepest groove depths, i.e., groove depth d1 is deeper than groove depth d2, and d1 is deeper than d3. For example, the groove depth d3 of the diffusion groove 121 in the lateral diffusion groove group C2 that is adjacent to the central diffusion groove group C1 is shallower than the groove depth d2 of the diffusion groove 121 furthest from the central diffusion groove group C1, i.e., d2 is deeper than d3.

[0041] In Figure 5b, an odd number of diffusion grooves 121 are used as an example for explanation. The diffusion grooves 121 in the central diffusion groove group C1 have a groove depth d1, the diffusion groove 121 in the lateral diffusion groove group C2 that is furthest from the central diffusion groove group C1 has a groove depth d2, and the diffusion grooves 121 in the lateral diffusion groove group C2 that are adjacent to the central diffusion groove group C1 have a groove depth d3. The diffusion grooves 121 in the central diffusion groove group C1 have the deepest groove depths, i.e., groove depth d1 is deeper than groove depth d2, and groove depth d1 is deeper than groove depth d3. For example, the groove depth d3 of the diffusion groove 121 in the lateral diffusion groove group C2 that is adjacent to the central diffusion groove group C1 is shallower than the groove depth d2 of the diffusion groove 121 furthest from the central diffusion groove group C1, i.e., d2 is deeper than d3.

[0042] Based on the audio module 1 shown in Figures 5a and 5b, the groove depth d of the diffusion groove 121 of the central diffusion groove group C1 is deeper than the groove depth d of the diffusion groove 121 of the lateral diffusion groove group C2. After the sound emitted by the loudspeaker 11 is diffused by the diffuser 12, the frequency response of the diffused sound field can be optimized. Figure 6 shows a curve relating the frequency and sound pressure level of the sound diffused by the diffuser 12. The frequency response of the sound changes slowly, without any obvious peaks or valleys. This corresponds to attenuating the change in sound intensity. In this way, the user experience can be improved.

[0043] The groove depth d of the diffusion groove 121 determines the lower limit of the sound frequency emitted by the loudspeaker 11; in other words, the groove depth d of the diffusion groove 121 is related to the minimum sound frequency.

[0044] As shown in the front view of the audio module 1 in Figure 7a, the total groove width W of the multiple diffusion grooves 121 is approximately 3.5 cm to 12 cm. The total groove width W corresponds to the sum of the groove width w1 of the multiple diffusion grooves 121 and the thickness w2 of the partition wall between any two adjacent diffusion grooves 121. The total groove width W can also be considered as the distance between the end of one lateral diffusion groove group C2 away from the central diffusion groove group C1 and the end of the other lateral diffusion groove group C2 away from the central diffusion groove group C1.

[0045] The groove width w1 of the diffusion groove 121 may or may not be equal. Specific embodiments may be set according to specific manufacturing processes and application scenarios. This is not limited here.

[0046] If the groove widths w1 of the diffusion grooves 121 are equal, then for each diffusion groove 121, the groove width w1 relates to the upper limit of the sound frequency band. In the audio module 1 provided in the embodiment of this application, the groove width of each diffusion groove 121 satisfies the following conditions: w1=c air / (2×f max ) Here, w1 is the groove width of the diffusion groove 121, c air The speed of sound is f max This represents the maximum frequency in the frequency band in which the loudspeaker 11 operates. A larger maximum frequency in the frequency band in which the loudspeaker 11 operates indicates a smaller groove width in the diffusion groove 121.

[0047] The cross-sectional structure shown in Figure 7b can be obtained by cutting the audio module 1 in a direction perpendicular to the plane formed by the second direction Y and the third direction Z. In Figure 7b, the groove length H of the diffusion groove 121 in the central diffusion groove group C1 is greater than 2 cm. The groove length H of the diffusion groove 121 varies depending on the structure of the diffuser 12. In Figure 7b, the sound emission surface B of the loudspeaker 11 is parallel to the upper surface of the base 13, and the angle between the normal direction of the sound emission surface B and the first inclined surface A1 is β, where β is between 30° and 70°.

[0048] It should be understood that the number of diffusion grooves 121 may be 4, 7, 9, 12, or more, and the number may be set according to the actual requirements. A larger number of diffusion grooves 121 indicates a better diffusion effect of the diffuser 12 for horizontal sound. For any lateral diffusion groove group C2, the groove depth d of the diffusion grooves 121 of the lateral diffusion groove group C2 is not limited, and the distribution rules for the groove depth d of the diffusion grooves 121 are not limited, as long as the groove depth d of the diffusion grooves 121 of the lateral diffusion groove group C2 is smaller than the groove depth d of the diffusion grooves 121 of the central diffusion groove group C1. The shape of the diffuser 12 in the audio module 1 provided in the embodiments of this application may be implemented in an alternative manner. In the front view of the diffuser 12 shown in Figure 8a, the structure of the diffuser 12 is similar to the structure of the diffuser 12 shown in Figure 3b. The first inclined surface A1 is flat, and the side away from the first inclined surface A1 is curved. Figure 8b is a cross-sectional view of the diffuser 12 shown in Figure 8a, cut along the plane where the PP is located. The diffuser 12 shown in Figure 8a has a larger dimension in the groove depth d direction of the diffusion groove 121 compared to the diffuser 12 shown in Figure 3b.

[0049] Figure 9a is a front view of the diffuser 12, which has a polygonal three-dimensional structure. Only the first inclined surface A1 of the diffuser 12 is shown. Figure 9b is a cross-sectional view of the diffuser 12 in Figure 9a, cut along the plane where QQ is located, and the first inclined surface A1 of the diffuser 12 is almost flat. In the direction perpendicular to the base 13, the diffuser 12 is rectangular, and the corners are smooth chamfered.

[0050] In the front view of the diffuser 12 shown in Figure 10a, the structure of the diffuser 12 is drum-shaped, and in the direction perpendicular to the base 13, both the top size and bottom size of the diffuser 12 are smaller than the waist size. Figure 10b is a cross-sectional view of the diffuser 12 of Figure 10a cut through the plane in which RR is located, and the first inclined surface A1 of the diffuser 12 is curved. In the direction perpendicular to the base 13, the diffuser 12 is circular.

[0051] Referring to Figures 8b, 9b, and 10b, the bottom wall 1212 of the diffusion groove 121 is planar, and the cross-section perpendicular to the extension direction of the diffusion groove 121 is rectangular. The shape of the diffusion groove 121 is shown in Figures 11a to 11d. In Figure 11a, the bottom wall 1212 of the diffusion groove 121 is planar, and the bottom wall 1212 and the side wall 1211 are perpendicular to each other. In Figure 11b, the bottom wall 1212 of the diffusion groove 121 is planar, and the bottom wall 1212 is perpendicular to the side wall 1211, and a chamfer may be applied between the bottom wall 1212 and the side wall 1211. Therefore, the transition between the bottom wall 1212 and the side wall 1211 is smoother. In Figure 11c, the bottom wall 1212 of the diffusion groove 121 is arcuate, and there is a smooth transition between the bottom wall 1212 and the side wall 1211. As shown in Figure 11d, there is an angle θ between the bottom wall 1212 and the side wall 1211 of the diffusion groove 121. Since the angle θ is greater than 90°, the width of the bottom wall 1212 is smaller than the width of the opening located on the first inclined surface A1 of the diffusion groove 121. The shape of the diffusion groove 121 facilitates draft operation when the diffuser 12 is manufactured.

[0052] It should be understood that the processing performed on sound by the diffusion groove 121 is to change the phase of the sound, and that changes in the shape of the diffusion groove 121 can correspondingly change the effect of changing the phase of the sound. Furthermore, when the shape of the diffusion groove 121 changes, the groove length H, groove width w1, and groove depth d of the diffusion groove 121 are adjusted accordingly to meet the usage requirements.

[0053] In some embodiments, Figure 12 is another diagram of the three-dimensional structure of the audio module 1. The groove depth d of the diffusion groove 121 in the diffuser 12 gradually increases in the direction away from the loudspeaker 11. The diffuser 12 in the audio module 1 is the diffuser 12 shown in Figure 9a.

[0054] Referring to Figure 12, see the enlarged view of section C in Figure 12 shown in Figure 13a. One of the diffusion grooves 121 is used as an example. The diffusion groove 121 has a bottom wall 1212 and two side walls 1211. Due to the limitations of the field of view, only one of the side walls 1211 is shown. The bottom wall 1212 is shown using an oblique shadow, and the side walls 1211 are shown using a dotted line shadow. The side edge of the side wall 1211 that is in contact with the bottom wall 1212 is the first side edge m, and the side edge of the side wall 1212 that is located on the first inclined surface A1 is the second side edge n. The distance from the second side edge n to the first side edge m may be considered as the groove depth d of the diffusion groove 121, i.e., the distance from the first inclined surface A1 to the bottom wall 1212.

[0055] The first side edge m may be curved or straight, and the second side edge n may also be curved or straight. This is not limited. Here, for example, both the first side edge m and the second side edge n are straight. When both the first side edge m and the second side edge n are straight, the angle between the first side edge m and the second side edge n is less than 60°. When the angle between the first side edge m and the second side edge n is 0°, the first side edge m and the second side edge n are parallel to each other, and the groove depth d of the diffusion groove 121 is constant at different positions. When the angle between the first side edge m and the second side edge n is greater than 0°, the groove depth d of the diffusion groove 121 changes linearly. In Figure 13a, the first lateral edge m and the second lateral edge n are not parallel, and an angle γ exists between the first lateral edge m and the second lateral edge n.

[0056] Furthermore, please refer to the simplified diagrams of the first and second side edges m and n shown in Figure 13b. A narrow angle γ exists between the first and second side edges m and n, and the range of the narrow angle γ is less than 60°. The vertical distance from the second side edge n to the first side edge m is the groove depth d of the diffusion groove 121. In the direction away from the loudspeaker 11, the vertical distance from the second side edge n to the first side edge m gradually increases, i.e., the groove depth d of the diffusion groove 12 gradually increases. In the diffusion groove 121, the phase of the sound emitted from the loudspeaker 11 changes, and multiple phases of sound are reflected. By changing the groove depth d of the diffusion groove 121, the possibility of sound phase changes can be increased, i.e., the phase changes of reflected sound can be made richer. Therefore, there are more possible changes.

[0057] For the entire diffuser 12, the angle γ between the first side edge m and the second side edge n of the side wall 1211 in the diffusion groove 121 may be set to the same value or to different values. This is not limited here. When the angle between the first side edge m and the second side edge n of the diffusion groove 121 is equal, the different diffusion grooves 121 form a more uniform appearance.

[0058] Naturally, the groove depth of the diffusion groove 121 does not have to change linearly; that is, the first lateral edge m and the second lateral edge n do not necessarily have to form an angled relationship. In this way, based on ensuring horizontal diffusion of sound, it is possible to bring richer phase changes to the sound and improve the auditory experience.

[0059] In another embodiment, as shown in Figure 14, the first side edge m of the side wall 1211 may be straight, and the second side edge n may be curved. In this structure, the first inclined surface A1 of the diffuser 12 having the diffusion groove 121 is the surface on which the second side edge n is located. Therefore, the first inclined surface A1 may be a curved surface.

[0060] In the above embodiment, the sound-emitting surface B of the loudspeaker 11 is parallel to the base 13. In certain applications, the base 13 may be positioned on different bearing surfaces as needed. When the bearing surface is parallel to the horizontal plane, the sound-emitting surface B of the loudspeaker 11 is parallel to the horizontal plane. When there is a specific narrow angle between the bearing surface and the horizontal plane, there is a specific narrow angle between the sound-emitting surface B of the loudspeaker 11 and the horizontal plane. The narrow angle is between 0° and 60°.

[0061] In some embodiments, as shown in Figure 15, the sound-emitting surface B of the loudspeaker 11 is positioned at an angle to the base 13. Specifically, the base 11 and the loudspeaker are positioned relative to the upper surface G of the base 13. 11 An angle φ exists between the sound emission surface B of the loudspeaker 11 and the base 13, and the angle φ is in the range of 0° to 60°. When the base 13 is placed on a horizontal plane, this corresponds to the existence of an angle φ between the sound emission surface B of the loudspeaker 11 and the horizontal plane. The upper surface G of the base 13 and the loudspeaker 11 Regardless of the value of the angle φ between the sound emission surface B of the loudspeaker 11 and the sound emission surface B of the diffuser 12, please understand that the angle β between the normal direction of the sound emission surface B of the loudspeaker 11 and the sound emission surface B of the diffuser 12 is in the range of 30° to 70°.

[0062] The audio module 1 provided in the embodiments of this application has high horizontal uniformity and can provide nearly consistent hearing at different horizontal positions. In addition, the audio module 1 can further reduce the peak-valley phenomenon of high-frequency sounds to improve the user's auditory experience.

[0063] Since audio module 1 can have good uniformity in the horizontal direction, audio module 1 is used in midrange, mid-high range, and high-frequency acoustic units to provide good hearing, and it mitigates the adverse effects caused by the short wavelengths and strong directivity of mid-high range frequencies.

[0064] As an application scenario, the audio module 1 may be applied to scenarios where there is a high demand for horizontal uniformity of sound, such as indoor scenarios or vehicle cockpits. Based on this, one embodiment of the present application further provides a vehicle 10, which may include a vehicle body 2 and an audio module 1 located in the vehicle cockpit of the vehicle body 2. For example, as shown in Figure 16a, the audio module 1 may be located in the center of the vehicle control panel 21 in the vehicle cockpit. Alternatively, as shown in Figure 16b, the audio module 1 may be located at the corner of the joint between the A-pillar 23 and the windshield 22.

[0065] Regarding hearing, when occupants are in different positions within the vehicle cockpit, the difference in sound is not large in the vertical direction, but rather large in the horizontal direction. Audio module 1 has good horizontal uniformity and can evenly diffuse sound to different horizontal positions, so occupants seated in different positions can experience nearly consistent hearing. In addition, audio module 1 can further reduce the peak-valley phenomenon in the high-frequency range, resulting in optimized sound frequency response and further improving the user's auditory experience.

[0066] In particular, when the audio module 1 is specifically a high-frequency module, the diffuser 12 diffuses the sound emitted by the loudspeaker 11, thereby reducing the negative impact caused by the strong directivity of short-wavelength, high-frequency sounds, and making the horizontal high-frequency field in the vehicle cockpit more uniform. In a vehicle 10 equipped with a high-frequency module, the sound field in the cockpit becomes brighter and clearer, improving the user experience.

[0067] It should be understood that when audio module 1 is used in vehicle 10, the structure and shape of audio module 1 can be further personalized to match the brand style of different vehicles. For example, by matching the height-adjustable and rotatable support structure of audio module 1 and arranging a display table on which audio module 1 can be displayed, audio module 1 can be given a more flexible and decorative appearance. Examples are not described here.

[0068] The foregoing description is merely a specific implementation of the present application and is not intended to limit the scope of protection of this application. Any modifications or substitutions that are readily conceivable by a person skilled in the art within the scope of the art disclosed in this application shall also fall within the scope of protection of this application. Accordingly, the scope of protection of this application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0069] 1 Audio Module 2 car bodies 10 vehicles 11. Loudspeakers 12 Diffuser 13 Bass 21 Vehicle control panel 22 Windshield 23 A-pillar 121 Diffusion groove 1211 Side wall 1212 Bottom wall A1 First inclined surface A2 top surface A3 bottom end B Sound emitting surface C1 Central Diffusion Trench Group C2 Lateral Diffusion Groove Group G Top surface H groove length W Total groove width X First direction Y Second direction Z Third direction d Groove depth d1 groove depth d2 groove depth d3 groove depth m First lateral edge n Second lateral edge w1 Groove width w2 thickness α acute angle β included angle γ included angle θ included angle φ included angle

Claims

1. An audio module comprising a base, a loudspeaker, and a diffuser, wherein both the loudspeaker and the diffuser are fastened to the base, the diffuser is positioned on the sound-emitting side of the loudspeaker, and the diffuser has a first inclined surface that is inclined toward the loudspeaker. In the first direction, the diffuser is provided with a plurality of diffusion grooves having openings located on the first inclined surface, the direction of extension of each diffusion groove is perpendicular to the first direction, the first direction is parallel to the base, and the first inclined surface and the inner walls of each diffusion groove are configured to reflect sound. The plurality of diffusion grooves include a central diffusion groove group and two lateral diffusion groove groups, the two lateral diffusion groove groups being identical and symmetrically arranged on both sides of the central diffusion groove group in the first direction, the central diffusion groove group corresponding to the central position of the loudspeaker, and the maximum groove depth of the diffusion grooves in the central diffusion groove group being deeper than the maximum groove depth of the diffusion grooves in the lateral diffusion groove group. Audio module.

2. The audio module according to claim 1, wherein the number of diffusion grooves is even, the central diffusion groove group includes two identical diffusion grooves, and the distance from the two diffusion grooves of the central diffusion groove group to the central position of the loudspeaker is equal.

3. The audio module according to claim 2, wherein the number of diffusion grooves is odd, the central diffusion groove group includes one diffusion groove, and the central position of the diffusion groove in the central diffusion groove group corresponds to the central position of the loudspeaker.

4. The audio module according to claim 1, wherein the maximum groove depth of the diffusion grooves in the central diffusion groove group is less than 4.9 cm.

5. The audio module according to claim 1, wherein the inner wall of the diffusion groove includes a bottom wall and two side walls, the two side walls being located on either side of the bottom wall in the first direction, and a narrow angle exists between the bottom wall and the first inclined surface.

6. The audio module according to claim 5, wherein the angle between the bottom wall and the first inclined surface is less than 60°.

7. The audio module according to claim 6, wherein the angle between the bottom wall and the first inclined surface in all diffusion grooves is equal.

8. The audio module according to claim 5, wherein a chamfered portion is provided at the joint between the bottom wall and the side wall.

9. The audio module according to claim 1, wherein each diffusion groove has a groove width equal to the first direction.

10. The groove width of each diffusion groove is subject to the following conditions: w1=c ａｉｒ / (2×f ｍａｘ ) Satisfying the conditions, w1 is the groove width of the diffusion groove, c ａｉｒ is the speed of sound, f ｍａｘ This is the maximum frequency in the frequency band in which the loudspeaker operates. The audio module according to claim 9.

11. The audio module according to claim 1, wherein the groove length of each diffusion groove is greater than 2 cm in the direction of extension of the diffusion groove.

12. The audio module according to claim 1, wherein, in the first direction, the distance between the end of one lateral diffusion groove group that is away from the central diffusion groove group and the end of the other lateral diffusion groove group that is away from the central diffusion groove group is 3.5 cm to 10 cm.

13. The audio module according to claim 1, wherein the angle between the first inclined surface and the normal to the sound-emitting surface of the loudspeaker is 30° to 70°.

14. The audio module according to claim 1, wherein the first inclined surface is a flat or curved surface.

15. The audio module according to claim 1, wherein the angle between the sound-emitting surface of the loudspeaker and the base is 0° to 60°.

16. A vehicle comprising a vehicle body and an audio module according to any one of claims 1 to 15, wherein the audio module is disposed on the vehicle body.

17. The vehicle according to claim 16, wherein the audio module is positioned in the center of the vehicle dashboard of the vehicle body, or the audio module is positioned at the corner of the joint between the A-pillar and the windshield of the vehicle body.

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