acoustic reflector

Abstract

This invention provides a sound reflector; the sound reflector is disposed on the sound-emitting side of a loudspeaker, and the sound reflector has a diamond-cut multifaceted structure. The sound reflector includes a pavilion and a crown; wherein, the pavilion has a conical structure, the pavilion includes at least two first reflective surfaces, and the at least two first reflective surfaces are symmetrically distributed about a central axis; the central axis is the axis of symmetry of the loudspeaker; the crown is located on the side of the bottom surface of the conical structure opposite to the pavilion, and the crown includes at least two second reflective surfaces; this invention provides a sound reflector with strong high-frequency sound energy focusing, controllable directivity, and high reflection efficiency. The diamond-cut multifaceted structure optimizes the reflection path of high-frequency sound rays, while also taking into account aesthetic appearance, and has the characteristics of "multi-directional reflection, high symmetry, and beautiful appearance".

Description

Technical Field

[0001] This invention relates to the field of acoustic equipment technology, to loudspeakers, and particularly to tweeters, specifically a sound reflector. Background Technology

[0002] Existing tweeters mostly use a single spherical / conical structure for their sound reflectors, which has the following drawbacks:

[0003] (1) High-frequency sound energy (2kHz~20kHz) is reflected and dispersed, with poor directivity control. Its expression formula is:

[0004] ;

[0005] in: It is a directional function, with the unit being decibels (dB). lg is the logarithm to base 10. To be aligned with the axis of the reflector Sound pressure in the angular direction, The direction of the reflector axis ( The sound pressure level is 0°.

[0006] (2) The sound reflection path is simple, which easily leads to high-frequency sound energy loss or local over-intensity.

[0007] (3) The single curvature structure results in a single sound reflection path, which easily leads to high-frequency sound energy loss or local over-intensity, and in When >30° The attenuation rapidly exceeds 15dB, resulting in uneven sound wave coverage.

[0008] (4) The low degree of integration between appearance design and acoustic performance is also a shortcoming of existing technology. Summary of the Invention

[0009] The purpose of this invention is to provide an acoustic reflector to solve the problems mentioned in the background art.

[0010] This invention provides a sound reflector disposed on the sound-emitting side of a loudspeaker. The sound reflector has a diamond-cut polyhedral structure and includes a pavilion and a crown. The pavilion is conical in shape and includes at least two first reflecting surfaces, which are symmetrically distributed about a central axis. The central axis is the axis of symmetry of the loudspeaker. The crown is located on the side of the conical structure opposite to the pavilion and includes at least two second reflecting surfaces. The definition of the first... The tilt angle of the first reflecting surface is ,

[0011] ;

[0012] in, Indicates the first The target coverage angle of the first reflective surface; Indicates the half-angle of the diaphragm's acoustic radiation; For the first The angle between the normal of the first reflecting surface and the central axis;

[0013] The normal to the first reflecting surface is the angle bisector of the incident and emitted sound rays; the first reflecting surface is defined as... The tilt angle of the second reflecting surface is ,

[0014] ;

[0015] ;

[0016] in, Indicates the first The target coverage angle of the second reflective surface; Indicates the first The total target coverage angle corresponding to the second reflective surface; Indicates the first The target coverage angle of the first reflective surface corresponding to the second reflective surface; For the first The angle between the normal of the second reflecting surface and the central axis.

[0017] This invention provides a sound reflector with strong high-frequency sound energy focusing, controllable directionality, and high reflection efficiency. The reflection path of high-frequency sound rays is optimized through a diamond-cut multi-faceted structure, while also taking into account aesthetic appearance. It features "multi-directional reflection, high symmetry, and beautiful appearance". By adapting it to acoustic reflection logic, the problems mentioned in the background art are effectively solved.

[0018] In one implementation of the present invention, the at least two first reflective surfaces include a horizontal control group and a vertical control group; wherein, the horizontal control group is used to control the horizontal coverage angle; the vertical control group is used to control the vertical coverage angle; the central axis is defined as the Z-axis direction, the left-right direction as the X-axis direction, and the up-down direction as the Y-axis direction; when the angle between the normal of the first reflective surface and the X-axis is less than or equal to 45°, the first reflective surface is defined as the horizontal control group, and the target coverage angle of the first reflective surface is the horizontal coverage angle; when the angle between the normal of the first reflective surface and the Y-axis is less than or equal to 45°, the first reflective surface is defined as the vertical control group, and the target coverage angle of the first reflective surface is the vertical coverage angle.

[0019] In one implementation of the present invention, the pavilion portion and the crown portion are connected by a waist portion.

[0020] In one implementation of the present invention, the pavilion portion includes twenty-four first reflective surfaces; wherein the twenty-four first reflective surfaces include eight primary reflective surfaces and sixteen secondary reflective surfaces; the crown portion includes thirty-three second reflective surfaces; wherein the thirty-three second reflective surfaces include a platform, eight star-shaped facets, eight kite-shaped facets, and sixteen triangular facets.

[0021] In one implementation of the present invention, the diameter of the bottom surface of the conical structure is 20-80 mm.

[0022] As described above, the acoustic reflector of the present invention has the following beneficial effects:

[0023] Compared with existing technologies, this invention provides a high-frequency acoustic focusing reflector based on a diamond-cut polyhedral structure. Through a special geometric structure and precise tilt angle design, it effectively solves the technical problems of high-frequency sound energy dispersion and poor directivity control of traditional reflectors, and achieves the unity of acoustic performance and aesthetic design. Attached Figure Description

[0024] Figure 1 The diagram shown is a structural schematic of the acoustic reflector described in an embodiment of the present invention.

[0025] Figure 2 This is a structural view of the main reflective surface as seen from the pavilion towards the crown, according to an embodiment of the present invention.

[0026] Figure 3 This is a structural view of the secondary reflective surface as seen from the pavilion towards the crown, according to an embodiment of the present invention.

[0027] Figure 4 This is a structural view of the platform as shown in an embodiment of the present invention, viewed from the crown towards the pavilion.

[0028] Figure 5 This is a structural view of the star-shaped facets as seen from the crown towards the pavilion, according to an embodiment of the present invention.

[0029] Figure 6 This is a structural view of the kite surface as shown in an embodiment of the present invention, viewed from the crown towards the pavilion.

[0030] Figure 7 The diagram shows a structural view of the triangular facets as described in an embodiment of the present invention, viewed from the crown towards the pavilion. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] See Figures 1 to 7 The following embodiments of the present invention provide a high-frequency acoustic focusing reflector based on a diamond-cut polyhedral structure. Through a special geometric structure and precise tilt angle design, it effectively solves the technical problems of high-frequency sound energy dispersion and poor directivity control of traditional reflectors, and achieves a unity of acoustic performance and aesthetic design.

[0034] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] like Figures 1 to 7 As shown, in one embodiment, the present invention provides a sound reflector, which is disposed on the sound-emitting side of a loudspeaker (specifically, the sound reflector is located at the axis of the loudspeaker diaphragm; in practical applications, the loudspeaker emits sound towards a target direction, and the sound reflector, located on the axis of the loudspeaker diaphragm facing the target direction, serves to reflect the sound). The sound reflector is a diamond-cut polyhedral structure (with... Figures 1 to 7 (Taking the 57-sided structure as an example for illustration), the sound reflector includes: pavilion 1 (responsible for distributing high-frequency sound energy to the main listening area, determining the "skeleton" of horizontal and vertical coverage) and crown 2 (used to supplement the off-axis blind area that pavilion 1 cannot cover, and optimize the sound pressure uniformity at the edge of the listening area).

[0036] It should be noted that the following requirements apply to pavilion section 1 and crown section 2: structural positional coordination.

[0037] Sound path difference constraint: The sound path difference between pavilion 1 and crown 2 and the listening area needs to be controlled within a certain range to avoid sound image shift or echo due to the Haas effect.

[0038] Spatial complementarity: The reflective surfaces of pavilion 1 and crown 2 must not block each other in space, otherwise it will cause secondary reflection of sound energy and sound coloration, affecting high-frequency clarity.

[0039] like Figures 1 to 7 As shown, in this embodiment, the pavilion 1 has a conical structure and includes at least two first reflective surfaces, which are symmetrically distributed about the central axis to ensure consistency between the left and right channels. The central axis is the axis of symmetry of the loudspeaker (it extends from the center of the diaphragm and points directly in front of the listening area, serving as the design baseline for the entire reflective waveguide). The crown 2 is located on the side of the bottom surface of the conical structure opposite to the pavilion 1, and includes at least two second reflective surfaces to correct off-axis attenuation in the vertical direction. The definition of the first... The tilt angle of the first reflecting surface is ,

[0040] ;

[0041] in, Indicates the first The target coverage angle of the first reflective surface; Indicates the half-angle of the diaphragm's acoustic radiation; For the first The angle between the normal of the first reflecting surface and the central axis; It is a positive integer.

[0042] According to the law of specular reflection, the normal to the first reflecting surface is the angle bisector of the incident sound ray and the outgoing sound ray. This is the core basis for the above formula for calculating the tilt angle of the first reflecting surface.

[0043] In the standard reflective waveguide design process These are inherent parameters of the tweeter unit and can be determined as constants in the following ways: directly obtained from the speaker manufacturer's datasheet; most professional tweeters will specify "off-axis response" or "radiation angle" parameters, such as 30° or 40°, which can be directly used as... Substitute into the formula. Actual calibration: Measure the angle of the unit at the -6dB point off-axis using an acoustic testing system (such as MLS, SoundCheck), and use this as the actual diaphragm acoustic radiation half-angle to ensure that the design matches the unit characteristics.

[0044] Determined by the diaphragm size; in one embodiment, Set to 15°-30°.

[0045] It should be noted that in the design of acoustic reflectors, the coverage angles in the horizontal and vertical directions must be defined and calculated separately, because the acoustic requirements of the listening area are different.

[0046] Specifically, in the horizontal direction: this determines the left and right coverage area of ​​the audience in the seating area (such as the horizontal width of the audience seats), requiring the sound energy to be evenly distributed and avoiding "distortion".

[0047] Vertical direction: Determines the coverage range of the audience in the vertical direction (such as the ear height of the front / rear row, the upper and lower sound field of the car cabin), requiring the sound energy to be focused at the height of the human ear to avoid upward / downward diffusion loss.

[0048] In one embodiment, the at least two first reflective surfaces include a horizontal control group and a vertical control group; wherein, the horizontal control group is used to control the horizontal coverage angle; the vertical control group is used to control the vertical coverage angle; the central axis is defined as the Z-axis direction, the left-right direction as the X-axis direction, and the up-down direction as the Y-axis direction; when the angle between the normal of the first reflective surface and the X-axis is less than or equal to 45°, the first reflective surface is defined as the horizontal control group, and the target coverage angle of the first reflective surface is the horizontal coverage angle; when the angle between the normal of the first reflective surface and the Y-axis is less than or equal to 45°, the first reflective surface is defined as the vertical control group, and the target coverage angle of the first reflective surface is the vertical coverage angle.

[0049] Correspondingly, the at least two second reflective surfaces of the crown also include a horizontal control group and a vertical control group; wherein, the horizontal control group of the crown is used to compensate for the horizontal coverage angle controlled by the horizontal control group of the pavilion to achieve the total coverage angle in the horizontal (left and right) direction; the vertical control group of the crown is used to compensate for the vertical coverage angle controlled by the vertical control group of the pavilion to achieve the total coverage angle in the vertical (up and down) direction.

[0050] It should be noted that the total coverage angle in the horizontal direction and the total coverage angle in the vertical direction are two independent design objectives that together constitute the directional "window" of the loudspeaker. Specifically, the total coverage angle in the horizontal direction is equal to the horizontal coverage angle controlled by the pavilion horizontal control group plus the horizontal coverage angle controlled by the crown horizontal control group; the total coverage angle in the vertical direction is equal to the vertical coverage angle controlled by the pavilion vertical control group plus the vertical coverage angle controlled by the crown vertical control group.

[0051] In this invention, both the total coverage angle in the horizontal direction and the total coverage angle in the vertical direction are used as known values. These represent the complete high-frequency coverage range that the loudspeaker ultimately aims to achieve, and are the ultimate goal of the entire sound reflector design. Their specific values ​​are not limiting conditions for this invention and can be determined based on the specific application scenario in practical applications; for example, based on the loudspeaker's usage scenario; for instance: home / near-field monitoring: 90° total coverage angle in the horizontal direction × 60° total coverage angle in the vertical direction; line array / professional sound reinforcement: 120° total coverage angle in the horizontal direction × 40° total coverage angle in the vertical direction; stage monitoring: 100° total coverage angle in the horizontal direction × 80° total coverage angle in the vertical direction. Industry standard: The coverage angle is usually defined as the off-axis angle at which the sound pressure level drops by 6dB. For example, "90° horizontal coverage" means that at a position ±45° of the central axis, the sound pressure level is still no more than 6dB lower than on-axis.

[0052] Similarly, the horizontal coverage angle controlled by the pavilion horizontal control group and the vertical coverage angle controlled by the pavilion vertical control group are both used as known values, and their specific values ​​are not considered as limiting conditions of the present invention. In practical applications, they can be determined according to the specific application scenario.

[0053] Specifically, if the first reflector belongs to the horizontal control group, then when calculating the tilt angle of the first reflector, the horizontal coverage angle controlled by the horizontal control group is taken as the target coverage angle of the first reflector and substituted into the above formula for calculation, thereby obtaining the tilt angle of the first reflector; similarly, if the first reflector belongs to the vertical control group, then when calculating the tilt angle of the first reflector, the vertical coverage angle controlled by the vertical control group is taken as the target coverage angle of the first reflector and substituted into the above formula for calculation, thereby obtaining the tilt angle of the first reflector.

[0054] In one embodiment, the total coverage angle in the horizontal direction is set to 90°-120°.

[0055] In one embodiment, the total coverage angle in the vertical direction is set to 40°-80°.

[0056] Based on the law of specular reflection (incident angle = reflection angle), the formula for calculating the tilt angle of the second reflecting surface is a symmetrically corrected form of the formula for calculating the tilt angle of the first reflecting surface; specifically,

[0057] Definition of the first The tilt angle of the second reflecting surface is ,

[0058] .

[0059] In this embodiment, The possible values ​​are as follows:

[0060] ;

[0061] in, Indicates the first The target coverage angle of the second reflective surface; Indicates the first The total target coverage angle corresponding to the second reflective surface (corresponding to the "total coverage angle in the horizontal direction" or "total coverage angle in the vertical direction" mentioned above); Indicates the first The target coverage angle of the first reflective surface corresponding to the second reflective surface; For the first The angle between the normal of the second reflecting surface and the central axis; It is a positive integer.

[0062] It should be noted that the above "the first" The second reflective surface could be either a horizontal control group or a vertical control group for the crown. Therefore, its corresponding total target coverage angle could be either a horizontal total coverage angle or a vertical total coverage angle. Similarly, when the first... When the second reflective surface serves as a horizontal control group for the crown, the second... The first reflective surface corresponding to the second reflective surface is the horizontal control group of the pavilion. When the second reflective surface is the first reflective surface corresponding to the second reflective surface, the first reflective surface is the horizontal control group of the pavilion. When the second reflective surface is used as a vertical control group for the crown, the second... The first reflective surface corresponding to the second reflective surface is the vertical control group of the pavilion.

[0063] Specifically, when the When the second reflective surface serves as a horizontal control group for the crown... It equals the total horizontal coverage angle minus the horizontal coverage angle controlled by the pavilion's horizontal control group; when the... When the second reflective surface serves as a vertical control group for the crown... It equals the total coverage angle in the vertical direction minus the vertical coverage angle controlled by the pavilion's vertical control group.

[0064] It should be noted that, in this invention, the above calculation formula can be used to match the tilt angle of the second reflective surface with the reflection path of the pavilion 1, ensuring that the sound rays leaking out after the pavilion is reflected can be accurately reflected by the crown reflective surface to the target coverage area, thereby avoiding the generation of harmful reflected sound.

[0065] According to the above calculation formula, the first... The tilt angle of the second reflecting surface Greater than the first The tilt angle of the first reflective surface corresponding to the second reflective surface is designed to ensure that the sound rays leaking out after reflection from the pavilion can be accurately guided to the target blind zone by the crown reflective surface, thereby achieving complete high-frequency coverage.

[0066] It should be noted that, in this invention, the essential difference between the crown 2 and the pavilion 1 is the spatial position of the reflective surface relative to the central axis. Specifically, for the pavilion 1, its first reflective surface is located below / to the side of the central axis and is responsible for reflecting the high-frequency sound energy radiated by the diaphragm towards the main direction of the listening area. For the crown 2, its second reflective surface is located above / to the opposite side of the central axis and is responsible for supplementing / uniformly reflecting the high-frequency sound energy radiated by the side lobes / backwards of the diaphragm, filling the sound pressure blind zone of the listening area.

[0067] It's important to clarify that in practical applications, the waveguide can be imagined as a "speaker" with its opening facing the listener. "Below / to the side of the central axis" refers to the first reflecting surface being located "in front of the diaphragm and closer to the listener" from the perspective of the central axis. For example, when the user is facing the speaker, the first reflecting surface is located on the left and right sides and below the central axis, closer to the user. Its function is to directly receive the sound waves emitted by the diaphragm and reflect the sound energy back to the user (listening area), completing the first and most important sound energy distribution. "Above / opposite to the central axis" refers to the second reflecting surface being located "behind the diaphragm and farther from the listener" from the perspective of the central axis. For example, when the user is facing the speaker, the second reflecting surface is above the central axis, farther from the user and closer to the back of the diaphragm. Its function is to receive the edge sound waves "leaking" out after reflection from the first reflecting surface, and then reflect them a second time, supplementing the edge of the listening area with this sound energy, widening the coverage, and avoiding sound energy waste.

[0068] In one embodiment, the pavilion 1 and the crown 2 are connected by a waist 3.

[0069] It should be noted that the waist section 3 has the following two main functions:

[0070] 1. Avoid a "discontinuity" between the reflective surfaces of pavilion 1 and crown 2, so that the transition of sound energy from the main sound field to the edge is smoother.

[0071] 2. In actual processing, the waist 3 can serve as a connecting structure between the pavilion 1 and the crown 2, thereby improving the overall strength.

[0072] like Figures 1 to 7 As shown, in one embodiment, the pavilion 1 includes twenty-four first reflective surfaces; wherein, the twenty-four first reflective surfaces include: eight primary reflective surfaces 101 and sixteen secondary reflective surfaces 102 (e.g., ...). Figure 2 and Figure 3As shown); the crown 2 includes thirty-three second reflecting surfaces; wherein, the thirty-three second reflecting surfaces include: a platform 201 (as the main surface for sound energy incident), eight star-shaped facets 202, eight kite-shaped facets 203, and sixteen triangular facets 204 (as shown). Figures 4 to 7 (As shown).

[0073] In this embodiment, the pavilion portion 1 and the crown portion 2 of the sound reflector have a total of 57 surfaces. It should be noted that these 57 surfaces are an optimized specific solution and are not intended to limit the present invention.

[0074] It should be noted that each additional reflective surface increases the precision of directional control, providing an additional degree of freedom to finely adjust the sound energy distribution at a specific angle. The aforementioned 57-surface structure allows for uniform sound pressure coverage within a listening area of ​​±60° horizontally and ±30° vertically. Too few surfaces result in insufficient control capability, while too many surfaces lead to diminishing marginal benefits.

[0075] The geometric symmetry and aesthetics of the 57-faceted structure are derived from a diamond-cut polyhedron, taking into account both acoustic performance and appearance design, while also facilitating injection molding.

[0076] Having too many facets in the manufacturing process can significantly increase mold complexity and manufacturing costs, and can also easily lead to processing errors, affecting acoustic performance. 57 facets is a balance point between performance and cost.

[0077] like Figure 2 and Figure 3 As shown, in one embodiment, four of the eight primary reflective surfaces 101 and twelve of the twenty-four secondary reflective surfaces 102 are designated as a horizontal control group, and the remaining four primary reflective surfaces 101 and the remaining twelve secondary reflective surfaces 102 are designated as a vertical control group.

[0078] In one embodiment, the diameter of the bottom surface of the conical structure is 20-80 mm.

[0079] It should be noted that in this embodiment, in order to adapt to the diameter of the tweeter diaphragm, the bottom diameter of the conical structure is controlled between 20-80mm.

[0080] In one embodiment, the acoustic reflector provided by the present invention is frequency-sensitive. Sound energy focusing efficiency for

[0081] ;

[0082] Wherein, n represents the total number of reflecting surfaces (corresponding to the first and second reflecting surfaces of this invention) in the acoustic reflector. Figures 1 to 7In the given information, n=57; Let m represent the area of ​​the m-th reflecting surface; m is a positive integer, and 1 ≤ m ≤ n; This represents the angle between the reflected sound ray from the m-th reflecting surface and the target listening area; This represents the total surface area of ​​all reflecting surfaces in a sound reflector. This indicates the sound reflection coefficient of the material used in the sound reflector. ≥0.95.

[0083] It should be noted that in acoustic engineering, a ray is a simplified model of sound wave propagation. It abstracts a sound wave as a ray to describe the direction of energy propagation. The "reflected ray" mentioned above refers to the ray that is emitted from the diaphragm, incident on a reflecting surface, and then reflected according to the law of specular reflection (angle of incidence = angle of reflection). For example, if the diaphragm emits a ray that is incident on a reflecting surface of pavilion 1 and then points towards the listening area after reflection, this reflected path is the reflected ray of that surface.

[0084] The "angle between the reflected sound ray and the target listening area" mentioned above is essentially the angle between the reflected sound ray and the central axis of the target area; it is a simplified engineering definition.

[0085] The specific steps are as follows:

[0086] 1. Define the central axis of the target area; First, determine the center position of the target listening area. The line connecting the center of the speaker diaphragm to this point is the central axis of the target area (that is, the central axis of the speaker mentioned above).

[0087] 2. Determine the direction vector of the reflected sound rays; for each reflecting surface, calculate the direction vector of the reflected sound rays (the vector from the reflecting surface to the direction of propagation) according to the law of specular reflection.

[0088] 3. Calculate the angle between the two vectors, i.e., the direction vector of the reflected sound ray and the direction vector of the central axis. When the reflected sound rays propagate exactly along the central axis, the included angle is 0°, cos =1 indicates that the reflected sound ray is perfectly pointed to the target area; when the reflected sound ray is completely deviated from the target, the included angle is 90°, cos =0 indicates that this reflected sound ray does not contribute to the target area.

[0089] In one embodiment, the high-frequency directivity index of the acoustic reflector provided by the present invention The calculation formula is as follows:

[0090] ;

[0091] in, The directivity index is a frequency-dependent index, measured in decibels (dB). It indicates the directivity at a given frequency. Down,

[0092] The sound source is The ratio in decibels of the radiation intensity in a direction to the radiation intensity in the same direction of an ideal omnidirectional point sound source of the same power; In spherical coordinates, this represents the point at which the specified axis (i.e., the central axis) of the sound source is perpendicular to the axis of the sound source. Angle, azimuth At this location, the frequency is The sound pressure level; This represents a reference sound pressure level, referring to the sound source on the central axis ( The sound pressure at 0° (0°); Represents the solid angle infinitesimal element; the entire denominator term Indicates the entire sphere ( The integral of the three-dimensional radian (in radian) is physically the average of the squared normalized sound pressure in all directions. It represents a logarithm with base 10.

[0093] The central axis mentioned above is also the central axis of the diaphragm. Specifically, it is a straight line extending forward from the physical center of the diaphragm, perpendicular to the diaphragm plane. This is the natural axis of symmetry for sound wave radiation. The sound wave energy emitted by the diaphragm naturally has the highest radiation intensity on this axis, which is the direction with the greatest sound pressure.

[0094] The acoustic reflector provided by the present invention will be further explained and illustrated below through specific embodiments.

[0095] In one embodiment, the bottom diameter D of the conical structure is 35mm, the sound reflector is injection molded from ABS engineering plastic and the surface is polished; the diameter of the platform 201 of the crown 2 is 8mm, and the tilt angle of the main reflector 101 of the pavilion 1, which serves as the horizontal control group, is determined according to... =90° (that is, the horizontal coverage angle controlled by the pavilion horizontal control group). =20°, calculated as =55°, used to control the horizontal diffusion of sound rays; the tilt angle of the main reflector 101 in the pavilion 1, which serves as the vertical control group, is based on... =100° (that is, the vertical coverage angle controlled by the pavilion vertical control group). =20°, calculated as =50°, used to control the vertical diffusion of sound rays.

[0096] It should be noted that, in this embodiment, the side reflective surfaces of the pavilion 1 and the crown 2 constitute a horizontal control group for controlling the directivity of the sound rays in the horizontal direction; a specific angle section of a portion of the reflective surface of the pavilion 1, and the top surface of the crown 2 constitute a vertical control group for controlling the directivity of the sound rays in the vertical direction.

[0097] Test results show that, =In the 2kHz-20kHz frequency band, =60° The attenuation is only 8dB, an improvement of more than 7dB compared to the traditional structure, and the sound energy focusing efficiency is high. Increased to 0.89; specifically, the calculation process is as follows:

[0098] according to Substituting the data n=57, ≈25° (calculated by reverse calculation based on off-axis attenuation). =0.95, calculate:

[0099] ;

[0100] ;

[0101] Off-axis attenuation Calculation formula:

[0102] ,

[0103] Substitute data: Actual measurement (Corresponds to -8dB).

[0104] This invention discloses a high-frequency acoustic focusing reflector based on a diamond-cut polyhedral structure. Through a special geometric structure (such as 57 facets) and precise tilt angle design, it effectively solves the technical problems of high-frequency sound energy dispersion and poor directivity control of traditional reflectors, and achieves the unity of acoustic performance and aesthetic design.

[0105] The modules / units described as separate components may or may not be physically separate. The components shown as modules / units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules / units can be selected to achieve the objectives of the embodiments of the present invention, depending on actual needs. For example, the functional modules / units in the various embodiments of the present invention may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0106] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0107] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0108] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An acoustic reflector provided on a sound emitting side of a speaker, characterized by, The acoustic reflector is a diamond-cut polyhedral structure, comprising a pavilion and a crown; wherein... The pavilion has a conical structure and includes at least two first reflective surfaces, which are symmetrically distributed about a central axis; the central axis is the axis of symmetry of the loudspeaker. The crown is located on one side of the bottom surface of the conical structure opposite to the pavilion, and the crown includes at least two second reflective surfaces; The first reflection surface is defined by a first plane and a first angle of inclination , the first angle of inclination being , ； wherein, denotes a target coverage angle of the first reflective surface; denotes a half angle of sound radiation of the diaphragm; is an angle between a normal of the first reflective surface and the central axis; The normal to the first reflecting surface is the angle bisector of the incident sound ray and the outgoing sound ray; Definition of the first The tilt angle of the second reflecting surface is , ； ； in, Indicates the first The target coverage angle of the second reflective surface; Indicates the first The total target coverage angle corresponding to the second reflective surface; Indicates the first The target coverage angle of the first reflective surface corresponding to the second reflective surface; For the first The angle between the normal of the second reflecting surface and the central axis.

2. The acoustic reflector according to claim 1, characterized in that, The at least two first reflecting surfaces include a horizontal control group and a vertical control group; wherein... The horizontal control group is used to control the horizontal coverage angle; the vertical control group is used to control the vertical coverage angle. The central axis is defined as the Z-axis, the left and right directions as the X-axis, and the up and down directions as the Y-axis. When the angle between the normal of the first reflecting surface and the X-axis is less than or equal to 45°, the first reflecting surface is defined as the horizontal control group, and the target coverage angle of the first reflecting surface is the horizontal coverage angle. When the angle between the normal of the first reflective surface and the Y-axis is less than or equal to 45°, the first reflective surface is defined as the vertical control group, and the target coverage angle of the first reflective surface is the vertical coverage angle.

3. The acoustic reflector according to claim 1, characterized in that, The pavilion section and the crown section are connected by a waist section.

4. The acoustic reflector according to claim 1, characterized in that, The pavilion includes twenty-four first reflective surfaces; wherein the twenty-four first reflective surfaces include: eight primary reflective surfaces and sixteen secondary reflective surfaces; The crown includes thirty-three second reflective surfaces; wherein the thirty-three second reflective surfaces include: a platform, eight star facets, eight kite facets, and sixteen triangular facets.

5. The acoustic reflector according to claim 1, characterized in that, The diameter of the base of the conical structure is 20-80 mm.

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