Audio module and vehicle

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] The present application relates to the field of terminal technology, in particular to audio modules and vehicles. [Background technology]

[0002] As automotive intelligence develops rapidly, automakers install audio modules in vehicle cockpits to enhance the auditory experience.

[0003] Currently, audio modules are placed on control panels or at the corners of the junctions between the A-pillars and the windshield of the vehicle cockpit. When the audio module is listened to from different positions in the vehicle cockpit, the difference in sound is not significant in the vertical direction, but is significant in the horizontal direction. When the sound emitted by the audio device is not highly uniform in the horizontal direction, the hearing experience at different positions in the vehicle cockpit is inconsistent, which affects the user experience. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides an audio module and a vehicle to optimize the horizontal uniformity of sound and improve the user's hearing experience. [Means for solving the problem]

[0005] According to a first aspect, the present application provides an audio module and a vehicle. The audio module can be applied to scenarios where high requirements are imposed on horizontal sound uniformity, such as vehicle scenarios. The audio module includes a base, a loudspeaker, and a diffuser. The loudspeaker and the diffuser are installed on a base, and the base can support the loudspeaker and the diffuser. The loudspeaker can emit sound, and the diffuser is disposed on the sound-emitting side of the loudspeaker to diffuse the sound emitted by the loudspeaker. Specifically, the diffuser has a first inclined surface inclined toward the loudspeaker, and the included 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. The diffuser is provided with a plurality of diffusion grooves with openings located on a first inclined surface in a first direction, with each diffusion groove extending perpendicular to the first direction and parallel to the base. Because 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 form a diffusing surface that reflects sound. The phase of the sound reflected by the diffusing surface changes. The phases of the sounds reflected by different diffusion grooves overlap and attenuate when the sounds converge, changing the horizontal sound distribution and achieving a diffusion effect, improving horizontal sound uniformity. The plurality of diffusion grooves includes a central diffusion groove group and two side diffusion groove groups. The two side diffusion groove groups are identical and are symmetrically arranged on either side of the central diffusion groove group. The central diffusion groove group corresponds to the center position of the loudspeaker. The diffusion grooves are arranged in a bilaterally symmetrical structure in the first direction so that sound is distributed symmetrically in the first direction. This further improves the horizontal uniformity of the sound. The maximum groove depth of the central diffusion groove group is deeper than the maximum groove depth of the side diffusion groove groups. This structural setting reduces the peak-valley phenomenon in the sound field frequency response, 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 includes two identical diffusion grooves, and the distances from the two diffusion grooves to the center of the loudspeaker are equal. When the number of diffusion grooves is odd, the central diffusion groove group includes one diffusion groove, and the center of the diffusion groove corresponds to the center of the loudspeaker. A larger number of diffusion grooves indicates a higher horizontal sound diffusion efficiency of the diffuser.

[0007] The groove depth of the diffusion grooves determines the lower frequency limit of the sound emitted by the loudspeaker. That is, the groove depth of the diffusion grooves is related to the minimum frequency of the sound. 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, each located on either side of the bottom wall in a first direction. The side walls have 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 side edges are straight and inclined at an included angle. When the included angle between the first and second side edges is 0°, the first and second side edges are parallel to each other, and the groove depth of the diffusion grooves at different positions is constant. When the included angle between the first and second side edges is greater than 0°, the groove depth of the diffusion grooves changes linearly. In some cases, the included angle between the first and second side edges is less than 60°.

[0010] In some cases, the included angle between the first side edge and the second side edge of all of the diffusion grooves is equal, and the different diffusion grooves create a neater appearance.

[0011] Of course, the groove depth of the diffusion groove does not have to change linearly, i.e., the second side edge and the first side edge do not have to simply form an angle. In this way, a richer phase change can be brought to the sound based on ensuring the horizontal diffusion of the sound, thereby improving the hearing experience.

[0012] In some possible implementations, the junction between the bottom wall and the side wall of the diffusion groove may be at a bent angle. In some cases, a chamfer may be placed at the junction between the bottom wall and the side wall so that there is a smooth transition between the bottom wall and the side wall.

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

[0014] When each diffusion groove has an equal groove width in the first direction, the groove width of each diffusion groove can satisfy the following condition: w1=c air / (2×f max ) where w1 is the width of the diffusion groove, c air is the speed of sound, f max is the maximum frequency in the frequency band in which the loudspeaker operates.

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

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

[0017] In some possible implementations, the included angle between the sound emitting surface of the loudspeaker and the base is between 0° and 60°, which increases the possibility of sound propagation direction. It should be understood that regardless of the angle relationship between the sound emitting surface of the loudspeaker and the base, the requirements of the above technical solution must be met between the first inclined surface of the loudspeaker and the sound emitting surface.

[0018] According to a second aspect, the present application provides a vehicle including the vehicle body and an optional audio module in the aforementioned technical solution, wherein the audio module is disposed in the vehicle body, so as to provide a better acoustic sensory experience to the occupants of the vehicle.

[0019] Specifically, the audio module is located in a central position on the vehicle dashboard of the vehicle body, or the audio module is located at a corner of the junction between the A-pillar and the windshield of the vehicle body. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a curve showing the relationship between the frequency and sound pressure level of diffused sound in the prior art. [Figure 2a] FIG. 1 is a diagram of a simple structure of an audio module according to an embodiment of the present application. [Figure 2b] FIG. 2 is a diagram of a specific structure of an audio module according to an embodiment of the present application; [Figure 2c] FIG. 2 is a diagram of a partial structure of an audio module according to an embodiment of the present application. [Figure 3a] FIG. 2 is a diagram illustrating sound emitted by a loudspeaker unit of an audio module according to an embodiment of the present application. [Figure 3b] FIG. 10 is a diagram of the horizontal diffusion of the diffuser of the audio module according to an embodiment of the present application. [Figure 4a] FIG. 10 is a diagram of a diffuser having an even number of diffusion grooves according to an embodiment of the present application. [Figure 4b] FIG. 10 is a diagram of a diffuser having an odd number of diffusion grooves according to an embodiment of the present application. [Figure 5a] FIG. 10 is a diagram illustrating the distribution of groove depths of diffusion grooves in an audio module according to an embodiment of the present application. [Figure 5b] FIG. 10 is a diagram illustrating the distribution of groove depths of diffusion grooves in an audio module according to an embodiment of the present application. [Figure 6] 3 is a curve of the relationship between sound frequency and sound pressure level of an audio module according to an embodiment of the present application; [Figure 7a] FIG. 1 is a diagram of the structure of an audio module according to an embodiment of the present application. [Figure 7b] FIG. 1 is a cross-sectional view of an audio module according to an embodiment of the present application. [Figure 8a] FIG. 2 is a diagram of the structure of a diffuser of an audio module according to an embodiment of the present application. [Figure 8b] FIG. 8b is a diagram of the cross-sectional structure at PP in FIG. 8a. [Figure 9a] FIG. 2 is a diagram of the structure of a diffuser of an audio module according to an embodiment of the present application. [Figure 9b] FIG. 9b is a diagram of the cross-sectional structure at QQ in FIG. 9a. [Figure 10a] FIG. 2 is a diagram of the structure of a diffuser of an audio module according to an embodiment of the present application. [Figure 10b] FIG. 10b is a diagram of the cross-sectional structure at RR in FIG. 10a. [Figure 11a] FIG. 2 is a diagram of the structure of the diffusion groove of the audio module according to an embodiment of the present application; [Figure 11b] FIG. 2 is a diagram of the structure of the diffusion groove of the audio module according to an embodiment of the present application; [Figure 11c] FIG. 2 is a diagram of the structure of the diffusion groove of the audio module according to an embodiment of the present application; [Figure 11d]FIG. 2 is a diagram of the structure of the diffusion groove of the audio module according to an embodiment of the present application; [Figure 12] FIG. 1 is a diagram of the structure of an audio module according to an embodiment of the present application. [Figure 13a] FIG. 13 is an enlarged view of part C in FIG. [Figure 13b] 10A and 10B are diagrams illustrating the structure of the first and second side edges of the diffusion groove in the audio module according to an embodiment of the present application; [Figure 14] 10A and 10B are diagrams illustrating the structure of the first and second side edges of the diffusion groove in the audio module according to an embodiment of the present application; [Figure 15] FIG. 1 is a cross-sectional view of an audio module according to an embodiment of the present application. [Figure 16a] 1 is a diagram of a vehicle structure according to an embodiment of the present application; [Figure 16b] 1 is a diagram of a vehicle structure according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0021] As intelligent technology develops, automobile manufacturers install audio modules in vehicle cockpits to improve the auditory experience. Currently, the sound emitted by the audio module has poor horizontal uniformity, causing passengers to experience different hearing sensations at different locations within the vehicle cockpit. To improve the horizontal uniformity of the sound, the sound emitted by the audio module can be diffused. Figure 1 shows a curve of the relationship between frequency and sound pressure level (SPL) of diffuse sound in the prior art. This curve is sometimes called the frequency response curve of a diffuse sound field. The abscissa represents the sound frequency in hertz (Hz), and the ordinate represents the sound pressure level in decibels (dB). The high-frequency band indicated by the dashed box has obvious peaks and valleys, indicating that the sound has large variations in sound intensity, which affects the user experience.

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

[0023] The terms used in the following embodiments are intended to describe particular embodiments only and are not intended to limit the present application. As used in this specification and the appended claims of this application, the singular forms "one," "a," "the," "the foregoing," and "this" are intended to include expressions such as "one or more," unless the context clearly dictates otherwise.

[0024] References to "one embodiment," "some embodiments," etc. described herein indicate that one or more embodiments of the present application include the particular feature, structure, or characteristic described with reference to the embodiment. Thus, the appearance of statements such as "in one embodiment," "in some embodiments," "in some other embodiments," "in other embodiments," etc. in different places in this specification are not necessarily meant to refer to the same embodiment. Instead, unless specifically emphasized otherwise, these statements mean "one or more, but not all, embodiments." The terms "including," "having," and variations thereof all mean "including, but not limited to," unless specifically emphasized otherwise.

[0025] As shown in FIG. 2a, one embodiment of the present application provides an audio module 1 that can be used in a vehicle. FIG. 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 a vehicle cockpit, the audio module 1 has high horizontal uniformity, allowing any position in the cockpit to have nearly identical sound, and occupants at any position in the cockpit to have nearly identical hearing and obtain a good hearing experience. Specifically, the audio module 1 includes a loudspeaker 11, a diffuser 12, and a base 13, with both the loudspeaker 11 and the diffuser 12 disposed on the base 13. The loudspeaker 11 is configured to convert electrical energy into sound energy to emit sound.

[0026] As a mechanical wave, sound has a phase and is sometimes referred to as a sound wave. Based on the phase characteristics of sound waves, sound waves of different phases may overlap or be attenuated when they merge. The overlapping of sound waves may strengthen the sound, while the attenuation of sound waves may weaken it. In the embodiment of the present application, the diffuser 12 is configured to reflect emitted sound waves. The sound waves are incident on the diffuser 12 at different positions and reflected at different angles. When the reflected sound waves merge, the sound waves overlap or are attenuated, changing the phase of the sound waves. The sound reflected by the diffuser 12 is more uniform in different directions. When the audio module 1 is a treble module, the sound emitted by the loudspeaker 11 includes high-frequency sound. High-frequency sound is characterized by short wavelengths and strong directionality. The diffuser 12 is disposed 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] Continuing to refer to Figure 2a, when the loudspeaker 11 has a theoretical sound-emitting surface B, the sound-emitting surface B of the loudspeaker 11 may be parallel to the base 13. Here, the sound-emitting surface B of the loudspeaker 11 is at the same height as the upper surface of the base 13. The sound emitted by the loudspeaker 11 is a highly directional beam-shaped sound wave, and the highly directional beam-shaped sound wave is perpendicular to a surface, which may be, for example, the sound-emitting surface B in Figure 2a. Therefore, the sound emitted by the loudspeaker 11 may be considered to be emitted by the sound-emitting surface B.

[0028] Diffuser 12 is fastened to base 13 and is located on the sound emitting side of loudspeaker 11, and has a first inclined surface A1 that slopes toward loudspeaker 11. Diffuser 12 further has a bottom end surface A3 for contacting base 13 and a top end surface A2 that is remote from base 13. There is an acute angle α between first inclined surface A1 and sound emitting surface B of loudspeaker 11.

[0029] FIG. 2b is a diagram showing the three-dimensional structure of the audio module 1. For convenience of illustration, a three-dimensional coordinate system including a first direction X, a second direction Y, and a third direction Z is defined with the base 13 as a reference. A plane including the first direction X and the second direction Y is parallel to the base 13 and also parallel to the sound emitting surface B of the loudspeaker 11. The third direction Z is perpendicular to the first direction X and the second direction Y, and is also perpendicular to the base 13 and the sound emitting 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 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 length direction are parallel to the diffuser 12. 12 The first inclined surface A1 is inclined toward the base 13, and the diffusion grooves 121 are arranged in the first direction X. The first inclined surface A1 is inclined toward the base 13, and the diffusion grooves 121 are arranged in the first direction X. The bottom end surface A3 is in contact with the base 13, and the ends of the diffusion grooves 121 that are farther from the top end surface A2 are located on the base 13.

[0030] It should be understood that the top end surface A2 and bottom end surface A3 of the diffuser 12 are merely a structural description of the shape of the diffuser 12 shown in FIG. 2b, and only the relative positions of the top end surface A2 and bottom end surface A3 are described, and features such as the shape of the surfaces are not limited.

[0031] 2a and 2b, sound emitted by the loudspeaker 11 can be projected onto the diffuser 12, and the first inclined surface A1 of the diffuser 12 and the inner walls of the plurality of diffusion grooves 121 form a sound diffusion surface that can reflect the sound. Referring to one structure of the diffusion groove 121 shown in FIG. 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 diffusion surface for diffusing sound 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 extension direction of the diffusion groove 121, both ends of the diffusion groove 121 are located at the top end surface A2 and the bottom end surface A3 of the diffuser 12, respectively. The length of the bottom wall 1212 in the extension 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 extension direction of the diffusion groove 121. In the diffusion groove 121 shown in FIG. 2c, the groove depth d does not change in the extension direction of the diffusion groove 121.

[0032] 2a to 2c, the plurality of diffusion grooves 121 are arranged in a first direction X, which is parallel to the base 13, and each diffusion groove 121 extends perpendicular to the first direction X. Here, an example of the number of diffusion grooves 121 is six. Sound emitted from the loudspeaker 11 is projected onto the first inclined surface A1, which 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, and the 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 action of the diffusion surface including the first inclined surface A1 and the inner walls of the plurality of diffusion grooves 121 joining together. The diffusion grooves 121 are arranged in the first direction X, and the base 13 is configured to support the loudspeaker 11 and the diffuser 12, so that the first direction X may be considered to be approximately horizontal. In this case, the diffusion grooves 121 can allow different phase changes of the sound in the horizontal direction, realize horizontal sound diffusion, and improve the uniformity of the sound in the horizontal direction.

[0033] 3a shows the three-dimensional structure of the audio module 1 from another angle. The sound emitted by the loudspeaker 11 is emitted into each diffusion groove 121, which changes the phase of the sound. Furthermore, as shown in FIG. 3b, the sound processed by the diffusion grooves 121 can interact with each other, generating reflected sound that is evenly diffused in the horizontal direction, resulting in evenly dispersed sound in the horizontal direction. This improves the horizontal uniformity of the sound.

[0034] Specifically, FIG. 3b shows a top view of the audio module 1, i.e., a view of the audio module 1 observed from directly above the base 13. The plurality of diffusion grooves 121 includes a central diffusion groove group C1 and two lateral diffusion groove groups C2. The two lateral diffusion groove groups C2 are identical and are arranged symmetrically on either side of the central diffusion groove group C1 in the first direction X. The central diffusion groove group C1 and the lateral diffusion groove groups C2 are divided based on their relative positions with respect to the loudspeaker 11, so that the plurality of diffusion grooves 121 have a bilaterally symmetrical structure. The central diffusion groove group C1 corresponds to the center position of the loudspeaker 11, and the distance that sound emitted by the loudspeaker 11 travels to the central diffusion groove group C1 is shortest. It will be understood that this bilateral symmetry is based on the first direction X. For the central plane of the plurality of symmetrical diffusion grooves 121, please refer to the center of the loudspeaker 11, which is located on the central plane. The sound emitted from the loudspeaker 11 is emitted into the diffusion grooves 121, and the phase of the sound is changed by the diffusion grooves 121 before being diffused. Since the plurality of diffusion grooves 121 are arranged symmetrically, the diffused sound can also be symmetric in the horizontal plane. This further improves the horizontal uniformity. In other words, the sound emitted from the loudspeaker 11 is diffused by the diffuser 12 and then distributed uniformly in the horizontal direction, thereby improving the horizontal uniformity of the sound.

[0035] The audio module 1 provided in this embodiment of the present application has wider directivity in the horizontal direction, stronger auditory consistency at different angle positions, and the treble is brighter and more transparent. Tests and comparisons have shown 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 an acoustic prism.

[0036] In the audio module 1 provided in the embodiment of the present application, the number of diffusion grooves 121 on the diffuser 12 is not limited. However, there are at least three diffusion grooves 121 based on the configuration of the central diffusion groove group C1 and the side diffusion groove groups C2 symmetrically arranged on both sides of the central diffusion groove group C1. When the number of diffusion grooves 121 is an even number, the central diffusion groove group C1 includes two of the same diffusion grooves 121, and the distances from the two diffusion grooves 121 to the center position of the loudspeaker 11 are equal. When the number of diffusion grooves 121 is an even number, 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, i.e., a view of the audio module 1 viewed from a viewpoint parallel to the base 13 from which the diffusion grooves 121 can be observed. The audio module 1 has six diffusion grooves 121, and a central diffusion groove group C1 includes two identical diffusion grooves 121, with the distances from the two diffusion grooves 121 to the center of the loudspeaker 11 being equal. One of the side diffusion groove groups C2 includes two diffusion grooves 121, with the diffusion grooves 121 of the two side diffusion groove groups C2 being symmetrical about the central diffusion groove group C1. The two diffusion grooves 121 of the central diffusion groove group C1 have the same center-to-center distance to the loudspeaker 11, which is shorter than the center-to-center distances to the loudspeaker 11 of the other diffusion grooves 121. Here, the center distance 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, FIG. 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 from which the diffusion grooves 121 can be observed. In FIG. 4b, there are five diffusion grooves 121, and a central diffusion groove group C1 includes one diffusion groove 121, which corresponds to the center position of the loudspeaker 11. Either of the side diffusion groove groups C2 includes two diffusion grooves 121, and the diffusion grooves 121 of the two side diffusion groove groups C2 are symmetrical about the central diffusion groove group C1. The diffusion grooves 121 of the central diffusion groove group C1 have the same center-to-center distance to the loudspeaker 11, which is shorter than the center-to-center distances of the other diffusion grooves 121. Here, the center-to-center distance 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.

[0039] In the audio module 1 provided in the present 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 side diffusion groove group C2. Specifically, the maximum groove depth of the diffusion grooves 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. group The maximum groove depth of the diffusion grooves 121 in C2 is smaller than the maximum groove depth of the diffusion grooves 121 in the central diffusion groove group C1. Referring to FIG. 2c, the maximum groove depth of the diffusion groove 121 is the groove depth d at the farthest point from the bottom wall 1212 of the diffusion groove 121 to the first inclined surface A1. FIGS. 5a and 5b show a top view of the diffuser 12, i.e., the structure of the diffuser 12 observed perpendicularly 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 extension direction of the diffusion groove 121 will be used to explain the diffuser 12.

[0040] 5a, an even number of diffusion grooves 121 are used as an example for illustrative purposes. The diffusion grooves 121 in the central diffusion groove group C1 have a groove depth d1, the diffusion grooves 121 in the lateral diffusion groove group C2 that are furthest from the central diffusion groove group C1 have 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 groove depth of the diffusion grooves 121 in the central diffusion groove group C1 is the deepest, 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 that is furthest from the central diffusion groove group C1, i.e., d2 is deeper than d3.

[0041] 5b, an odd number of diffusion grooves 121 are used as an example for illustrative purposes. The diffusion grooves 121 in the central diffusion groove group C1 have a groove depth d1, the diffusion grooves 121 in the lateral diffusion groove group C2 that are furthest from the central diffusion groove group C1 have 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 groove depth of the diffusion grooves 121 in the central diffusion groove group C1 is the deepest, 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 that is 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 grooves 121 in the central diffusion groove group C1 is deeper than the groove depth d of the diffusion grooves 121 in the side 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 of the relationship between frequency and sound pressure level of the sound diffused by the diffuser 12. The frequency response of the sound changes slowly, with no obvious peaks or valleys. This corresponds to a weakened change in sound intensity. This improves the user experience.

[0043] It should be understood that the groove depth d of the diffusion grooves 121 determines the lower frequency limit of the sound emitted by the loudspeaker 11, i.e., the groove depth d of the diffusion grooves 121 is related to the minimum frequency of the sound.

[0044] As shown in the front view of the audio module 1 in FIG. 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 between any two adjacent diffusion grooves 121. The total groove width W may be considered to be the distance between the end of one side diffusion groove group C2 that is remote from the central diffusion groove group C1 and the end of the other side diffusion groove group C2 that is remote from the central diffusion groove group C1.

[0045] The groove width w1 of the diffusion groove 121 may be equal or unequal. A specific embodiment can be set according to a specific manufacturing process and application scenario, which is not limited here.

[0046] When the groove width w1 of the diffusion grooves 121 is equal, the groove width w1 of the diffusion groove 121 is related to the upper limit of the sound frequency band for each diffusion groove 121. In the audio module 1 provided in the embodiment of the present application, the groove width of each diffusion groove 121 satisfies the following condition: w1=c air / (2×f max ) where w1 is the width of the diffusion groove 121, c air is the speed of sound, f max is the maximum frequency of the frequency band in which the loudspeaker 11 operates. The larger the maximum frequency of the frequency band in which the loudspeaker 11 operates, the smaller the groove width of the diffusion groove 121.

[0047] The cross-sectional structure diagram 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 grooves 121 in the central diffusion groove group C1 is greater than 2 cm. The groove length H of the diffusion grooves 121 varies depending on the structure of the diffuser 12. In Figure 7b, the sound emitting 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 emitting surface B and the first inclined surface A1 is β, which is 30° to 70°.

[0048] It should be understood that the number of diffusion grooves 121 may be 4, 7, 9, 12, or more, and may be set according to actual requirements. The greater the number of diffusion grooves 121, the better the diffuser 12's diffusion effect on horizontal sound. For any side diffusion groove group C2, as long as the groove depth d of the diffusion grooves 121 in the side diffusion groove group C2 is smaller than the groove depth d of the diffusion grooves 121 in the central diffusion groove group C1, the groove depth d of the diffusion grooves 121 in the side diffusion groove group C2 is not limited, and the distribution pattern of the groove depths d of the diffusion grooves 121 is not limited. The shape of the diffuser 12 in the audio module 1 provided in the embodiment of the present application may alternatively be implemented in another manner. In the front view of the diffuser 12 shown in FIG. 8a, the structure of the diffuser 12 is similar to that of the diffuser 12 shown in FIG. 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 diffuser 12 of Figure 8a cut along the plane where PP is located. Diffuser 12 shown in Figure 8a has a larger dimension in the groove depth d direction of diffusion grooves 121 than diffuser 12 shown in Figure 3b.

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

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

[0051] 8b, 9b, and 10b, the bottom wall 1212 of the diffusion groove 121 is flat, 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 FIGS. 11a to 11d. The bottom wall 1212 of the diffusion groove 121 shown in FIG. 11a is flat, and the bottom wall 1212 and the side wall 1211 are perpendicular to each other. The bottom wall 1212 of the diffusion groove 121 shown in FIG. 11b is flat, 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. This provides a smoother transition between the bottom wall 1212 and the side wall 1211. The bottom wall 1212 of the diffusion groove 121 shown in FIG. 11c is an arcuate surface, and there is a smooth transition between the bottom wall 1212 and the side wall 1211. 11d, there is an included angle θ between the bottom wall 1212 and the side wall 1211 of the diffusion groove 121, and since the included 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. When the diffuser 12 is manufactured, the shape of the diffusion groove 121 facilitates draft operation.

[0052] It should be understood that the process performed on sound by the diffusion groove 121 is to change the phase of the sound, and a change 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 is changed, the groove length H, groove width w1, and groove depth d of the diffusion groove 121 are correspondingly adjusted to meet usage requirements.

[0053] 12 is another view of the three-dimensional structure of audio module 1. The groove depth d of diffusion grooves 121 in diffuser 12 gradually increases in the direction away from loudspeaker 11. The diffuser 12 in audio module 1 is the diffuser 12 shown in FIG. 9a.

[0054] Referring to FIG. 12 , reference is made to the enlarged view of portion C of FIG. 12 shown in FIG. 13 a. 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 limitations in the angle of view, only one of the side walls 1211 is shown. The bottom wall 1212 is shown using oblique shading, and the side wall 1211 is shown using dotted shading. 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 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, the first side edge m and the second side edge n are both straight. When the first side edge m and the second side edge n are both straight, the included angle between the first side edge m and the second side edge n is less than 60°. When the included 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 at different positions is constant. When the included 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 FIG. 13a, the first side edge m and the second side edge n are not parallel, and there is an included angle γ between the first side edge m and the second side edge n.

[0056] Furthermore, see the simplified diagram of the first side edge m and the second side edge n shown in FIG. 13b. An included angle γ exists between the first side edge m and the second side edge n, and the included 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. The diffusion groove 121 changes the phase of the sound emitted from the loudspeaker 11, and multiple phases of sound are reflected. Changing the groove depth d of the diffusion groove 121 can increase the possibility of sound phase changes, i.e., the phase changes of the reflected sound can be more abundant. Therefore, there are more possible changes.

[0057] For the entire diffuser 12, the included 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 different values. This is not a limitation here. When the included 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 neat appearance.

[0058] Of course, the groove depth of the diffusion groove 121 does not have to change linearly, i.e., the first side edge m and the second side edge n do not have to simply form an angled relationship. In this way, by ensuring the horizontal diffusion of sound, a richer phase change can be brought to the sound, improving 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. The first inclined surface A1 of the diffuser 12 having the diffusion groove 121 of this structure 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 specific applications, the base 13 may be positioned on a different bearing surface as needed. When the bearing surface is parallel to the horizontal direction, the sound emitting surface B of the loudspeaker 11 is parallel to the horizontal plane. When there is a specific included angle between the bearing surface and the horizontal plane, there is a specific included angle between the sound emitting surface B of the loudspeaker 11 and the horizontal plane. The included angle is between 0° and 60°.

[0061] In some embodiments, as shown in Fig. 15, the sound emitting surface B of the loudspeaker 11 is disposed at an angle with respect to the base 13. Specifically, the sound emitting surface B of the loudspeaker 11 is disposed at an angle with respect to the top surface G of the base 13. 11 An included angle φ exists between the top surface G of the base 13 and the sound emitting surface B of the loudspeaker 11, and the included angle φ is in the range of 0° to 60°. When the base 13 is placed on a horizontal plane, this corresponds to an included angle φ existing between the sound emitting surface B of the loudspeaker 11 and the horizontal plane. 11 It should be understood that, regardless of the value of the included angle φ between the sound emitting surface B of the loudspeaker 11 and the sound emitting surface B of the diffuser 12, the included angle β between the normal direction of the sound emitting surface B of the loudspeaker 11 and the sound emitting surface B of the diffuser 12 is in the range of 30° to 70°.

[0062] The audio module 1 provided in the embodiment of the present application has high horizontal uniformity, and can provide a nearly consistent hearing experience 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 hearing experience.

[0063] Since the audio module 1 can have good uniformity in the horizontal direction, the audio module 1 can be used in mid-range, mid-high range, and treble sound units to provide good hearing, thereby weakening the adverse effects caused by the short wavelength and strong directionality of mid-high range sounds.

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

[0065] Regarding hearing, when passengers are in different positions in a vehicle cockpit, the difference in sound is not significant in the vertical direction but is significant in the horizontal direction. The audio module 1 has good horizontal uniformity and can diffuse sound evenly to different horizontal positions, so passengers sitting in different positions can experience a nearly consistent hearing experience. In addition, the audio module 1 can further reduce the peak-valley phenomenon in the high-frequency range, thereby optimizing the frequency response of the sound and further improving the user's hearing experience.

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

[0067] It should be understood that when the audio module 1 is used in the vehicle 10, the structure and shape of the audio module 1 can be further personalized to match the brand style of different vehicles. For example, a matching support structure that allows height adjustment and rotation of the audio module 1 and a display table that can display the audio module 1 can be arranged to provide the audio module 1 with a more flexible and decorative appearance. Examples are not described here.

[0068] The above description is merely a specific implementation form of the present application and is not intended to limit the scope of protection of the present application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0069] 1 Audio Module 2. Body 10 vehicles 11 Loudspeaker 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 groove group C2 Lateral diffusion grooves 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 side edge n Second side 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 disposed on a sound-emitting side of the loudspeaker, and the diffuser has a first inclined surface inclined toward the loudspeaker; In a first direction, the diffuser includes a plurality of diffusion grooves having openings located on the first inclined surface, the extension direction of each diffusion groove is perpendicular to the first direction, the first direction is parallel to the base, and the first inclined surface and an inner wall 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 either side of the central diffusion groove group in the first direction, the central diffusion groove group corresponding to a central position of the loudspeaker, and a maximum groove depth of the diffusion grooves in the central diffusion groove group being greater than a maximum groove depth of the diffusion grooves in the lateral diffusion groove groups; Audio module.

2. 2. The audio module of claim 1, wherein the number of diffusion grooves is an even number, the central diffusion groove group includes two identical diffusion grooves, and the distances from the two diffusion grooves in the central diffusion groove group to a center position of the loudspeaker are equal.

3. 3. The audio module of 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. 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. 5. The audio module of 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 the bottom wall and the first inclined surface being inclined by an included angle.

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

7. 7. The audio module according to claim 6, wherein the angles between the bottom walls and the first inclined surfaces of all the diffusion grooves are equal.

8. 8. The audio module of claim 5, wherein a chamfer is disposed at a joint between the bottom wall and the side wall.

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

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

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

12. An audio module as described in any one of claims 1 to 11, wherein 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.

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

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

15. 15. The audio module according to claim 1, wherein an included angle between the sound emitting surface of the loudspeaker and the base is between 0° and 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 in the vehicle body.

17. 17. The vehicle of claim 16, wherein the audio module is located in a central location on a vehicle dashboard of the vehicle body, or the audio module is located at a corner of a junction between an A-pillar and a windshield of the vehicle body.

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