Sound guide device and sound amplification equipment

Abstract

The invention belongs to the technical field of sound systems, and discloses a sound guide device and sound amplification equipment. The sound guiding device comprises a shell and a sound dividing structure, the shell is provided with a sound inlet and a sound outlet, the sound inlet of the shell is used for directly facing a loudspeaker, the sound outlet of the shell is used for directly facing a sound playing port of multimedia equipment, and the sound inlet is communicated with the sound outlet through a sound guiding channel in the sound wave propagation direction; the sound dividing structure is arranged in the sound guiding channel and divides part of the sound guiding channel into at least two flow dividing channels in the first direction, and the first direction is perpendicular to the extending direction of the sound dividing structure. According to the sound guide device, the medium-high frequency energy loss of sound waves is greatly reduced, and the condition that the medium-frequency peak value is prominent can be effectively reduced by sound wave shunting, so that a flatter sound wave frequency response curve is obtained, and the sound output effect and the sound output quality of the sound amplification equipment are further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound system, in particular to a sound guide device and a sound amplification equipment. BACKGROUND

[0002] The existing multimedia electronic equipment such as TV, tablet computer and large screen equipment are all installed with sound amplification equipment, and the specific structure of the sound amplification equipment determines the sound effect and sound quality of the multimedia equipment. The existing sound amplification equipment is mostly composed of a loudspeaker and a sound guide device. Since the installation space for the sound amplification equipment in the multimedia equipment is relatively small, the sound outlet of the loudspeaker is mostly a long strip-shaped slit outlet. In this case, the structural design of the sound guide device is limited, and the sound guide device is often divided into multiple sound outlets along the length direction, so that the mid-high frequency energy of the sound wave and the sound wave flatness are affected, thereby existing problems such as poor flatness of the emitted sound, insufficient high frequency energy radiation and prominent mid-frequency peak, which finally affect the sound effect and sound quality of the multimedia equipment.

[0003] Therefore, it is urgent to design a sound guide device to solve the above problems in the prior art. SUMMARY

[0004] The present application aims to provide a sound guide device and a sound amplification equipment, which are simple in structure and can improve the sound effect and sound quality.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] The sound guide device comprises:

[0007] A shell having an inlet and an outlet, the inlet of the shell is arranged to face the loudspeaker, the outlet of the shell is arranged to face the sound playing port of the multimedia equipment, and the inlet is communicated with the outlet through a sound guide channel along the propagation direction of the sound wave;

[0008] A sound splitting structure arranged in the sound guide channel, the extension direction of the sound splitting structure has an angle a with the long side of the cross section of the loudspeaker, and the angle a is not greater than the angle b between the diagonal of the cross section of the loudspeaker and the long side of the cross section of the loudspeaker, and the sound splitting structure divides part of the sound guide channel into at least two branch channels along a first direction, and the first direction is perpendicular to the extension direction of the sound splitting structure.

[0009] Preferably, the sound splitting structure comprises a fixed rib plate and at least two branch plugs.

[0010] In the first direction, two ends of the fixed rib plate are fixedly connected to the top wall surface and the bottom wall surface of the sound guide channel, and at least two of the flow distribution plugs are connected to the fixed rib plate in the first direction, and the sound guide channel is formed between adjacent two of the flow distribution plugs, between the top wall surface and the flow distribution plug close to the top wall surface, and between the bottom wall surface and the flow distribution plug close to the bottom wall surface.

[0011] Preferably, the sound distribution structure comprises a fixed rib plate and one flow distribution plug, and in the first direction, part of the sound guide channel is divided into a first flow distribution channel and a second flow distribution channel by the flow distribution plug.

[0012] In the first direction, the two opposite wall surfaces of the first flow distribution channel are parallel and have a distance S1, and the two opposite wall surfaces of the second flow distribution channel are parallel and have a distance S2, and S1=S2.

[0013] Preferably, the sound guide device further comprises a Helmholtz resonance structure, the Helmholtz resonance structure comprises a resonance cavity arranged in the flow distribution plug and a slit arranged on the flow distribution plug, and the resonance cavity is connected to the sound guide channel through the slit.

[0014] Preferably, the sound guide device further comprises a Helmholtz resonance structure, the shell is provided with a surrounding baffle, the surrounding baffle and the shell have a closed resonance cavity, and the Helmholtz resonance structure comprises the resonance cavity and a slit arranged on the shell, and the resonance cavity is connected to the sound guide channel through the slit.

[0015] Preferably, in the propagation direction of the sound wave, the end of the flow distribution plug close to the sound inlet is a sound distribution end.

[0016] In the propagation direction of the sound wave, the cross-sectional area of the sound guide channel between the sound distribution end and the sound inlet gradually decreases.

[0017] Preferably, the shell is provided with a pressure relief hole, and the sound guide channel is connected to the outside through the pressure relief hole.

[0018] Preferably, the pressure relief hole is covered with a gas-permeable damping material.

[0019] The sound amplification device comprises a loudspeaker and the sound guide device, the shell is connected to the loudspeaker, and the sound inlet is arranged opposite to the sound film of the loudspeaker.

[0020] Preferably, in the propagation direction of the sound wave, the end of the sound distribution structure close to the sound film has a clearance distance H from the sound film, and the clearance distance H is greater than the maximum amplitude of the sound film.

[0021] The present application has the following advantages:

[0022] The sound guiding device comprises a shell and a sound separating structure. The sound inlet of the shell is arranged opposite to the loudspeaker, the sound outlet is arranged opposite to the sound playing port of the multimedia device, and the sound inlet is communicated with the sound outlet through the sound guiding channel along the propagation direction of the sound wave. Therefore, the sound wave generated by the loudspeaker is propagated to the outside through the sound inlet, the sound guiding channel and the sound outlet in sequence, so that the sound is generated. The sound separating structure is arranged in the sound guiding channel. The sound separating structure separates part of the sound guiding channel into at least two branch channels along the first direction. Therefore, when the sound wave generated by the loudspeaker passes through the sound separating structure, the sound wave is divided into at least two propagation routes along the first direction of the loudspeaker, thereby greatly reducing the energy loss of the medium and high frequency of the sound wave, and the sound wave branch can effectively reduce the peak value of the medium frequency, so that a more flat sound wave frequency response curve is obtained, and the sound output effect and the sound output quality of the sound amplifying device are improved.

[0023] The sound amplifying device comprises the loudspeaker and the sound guiding device. The shell of the sound guiding device is connected with the loudspeaker and the sound inlet is arranged opposite to the sound membrane of the loudspeaker. The sound outlet of the sound guiding device is arranged opposite to the sound playing port of the multimedia device. Therefore, the sound generated by the loudspeaker can be emitted to the outside through the sound guiding device, so that the multimedia device emits the sound. The sound amplifying device solves the problem that the loudspeaker cannot completely face the sound playing port of the multimedia device. The sound wave is branched along the first direction, so that the energy loss of the medium and high frequency of the sound wave is effectively reduced. The sound output effect and the sound output quality are good at different positions along the length direction of the sound playing port of the multimedia device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is an assembly schematic view of the loudspeaker and the sound guiding device provided by the embodiment of the present application;

[0025] Figure 2 is a partial enlarged view of A in FIG. 4; Figure 1

[0026] Figure 3 is a first perspective structural schematic view of the sound guiding device provided by the embodiment of the present application;

[0027] Figure 4 is a second perspective structural schematic view of the sound guiding device provided by the embodiment of the present application;

[0028] Figure 5 is a structural schematic view of the Helmholtz resonance structure provided by the first embodiment of the present application;

[0029] Figure 6 is a structural schematic view of the Helmholtz resonance structure provided by the second embodiment of the present application;

[0030] ​Figure 7 is a rear view of the multimedia device shell provided by the embodiment of the present application;

[0031] Figure 8 is a contrastive graph of sound pressure level curve provided by the embodiment of the present application;

[0032] Figure 9 is a directivity frequency response curve graph provided by the embodiment of the present application.

[0033] in the figure:

[0034] 100-multimedia device shell;

[0035] 200-sound film;

[0036] 1-shell; 11-sound inlet; 12-sound outlet; 13-sound guide channel; 131-first shunt channel; 132-second shunt channel; 14-pressure relief hole; 15-enclosure baffle;

[0037] 2-sound splitting structure; 21-fixed rib; 22-shunt plug; 221-sound splitting end;

[0038] 3-Helmholtz resonance structure; 31-resonance cavity; 32-narrow opening;

[0039] 4-damping material. EMBODIMENT

[0040] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not in any way limiting of the present application. In addition, it should be understood that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0041] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0043] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, orientation or positional relationship shown in the drawings, are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0044] As shown in Figures 1 to 4 The present application provides a sound guiding device, which comprises a shell 1 and a sound splitting structure 2, the shell 1 has a sound inlet 11 and a sound outlet 12, the sound inlet 11 of the shell 1 is arranged to face the loudspeaker, the sound outlet 12 of the shell 1 is arranged to face the sound playing port of the multimedia device, and the sound inlet 11 is communicated with the sound outlet 12 through a sound guiding channel 13 in the propagation direction of the sound wave; the sound splitting structure 2 is arranged in the sound guiding channel 13, the extension direction of the sound splitting structure 2 has an included angle a with the long side of the loudspeaker cross section, and the included angle a is not greater than the included angle b between the diagonal of the loudspeaker cross section and the long side of the loudspeaker cross section, and the sound splitting structure 2 separates part of the sound guiding channel 13 into at least two branch channels in a first direction perpendicular to the extension direction of the sound splitting structure 2.

[0045] In the present embodiment, since the sound inlet 11 of the shell 1 is arranged to face the loudspeaker, and the sound outlet 12 is arranged to face the sound playing port of the multimedia device, and the sound inlet 11 is communicated with the sound outlet 12 through the sound guiding channel 13 in the propagation direction of the sound wave, the sound wave generated by the loudspeaker will be propagated to the outside world through the sound inlet 11, the sound guiding channel 13 and the sound outlet 12 in turn, thereby generating sound; the sound splitting structure 2 is arranged in the sound guiding channel 13, and the sound splitting structure 2 separates part of the sound guiding channel 13 into at least two branch channels in the first direction, so that the sound wave generated by the loudspeaker will be divided into at least two propagation routes in the first direction when passing through the sound splitting structure 2, thereby greatly reducing the energy loss of the medium and high frequency of the sound wave, and the sound wave splitting can effectively reduce the situation that the medium frequency peak is prominent, thereby obtaining a more flat sound wave frequency response curve, and further improving the sound output effect and sound output quality of the sound amplifying device.

[0046] Specifically, in the sound box position of some multimedia devices, due to the limited installation space, the loudspeaker cannot be completely aligned with the sound playing port of the multimedia device, and therefore the sound guide device needs to be installed to conduct sound waves; in the embodiment, the sound guide device corresponding to the sound box of the multimedia device is installed in the multimedia device shell 100, the cross section of the loudspeaker is a long strip structure, and the shape of the sound inlet 11 of the sound guide device matches the cross section shape of the outer periphery of the loudspeaker; in the process of propagation, the sound waves are divided into at least two branch flow routes in the first direction by the sound dividing structure to emit sound, which can improve the performance of sound in the medium and high frequency part; it can be understood that the specific shape of the sound guide device can be set according to the position to be installed, as long as the sound inlet 11 can be aligned with the sound film 200 of the loudspeaker, and the sound outlet 12 can be aligned with the sound playing port of the multimedia device shell 100.

[0047] In the embodiment, the first direction is perpendicular to the extension direction of the sound dividing structure 2, and the extension direction of the sound dividing structure 2 rotates between the long side and the diagonal of the cross section of the loudspeaker. In the embodiment, the extension direction of the sound dividing structure 2 is parallel to the long side of the cross section of the loudspeaker, and the first direction is parallel to the short side of the cross section of the loudspeaker.

[0048] The specific structure of the sound dividing structure 2 can be set according to actual conditions, as long as it can realize the branch flow of sound waves in the first direction. The cross-sectional areas of the branch flow channels can be the same or different. Exemplarily, the sound dividing structure 2 includes a fixed rib plate 21 and at least two branch flow plugs 22. In the first direction, the two ends of the fixed rib plate 21 are fixedly connected to the top wall surface and the bottom wall surface of the sound guide channel 13, and the at least two branch flow plugs 22 are connected to the fixed rib plate 21 in the first direction. Branch flow channels are formed between adjacent two branch flow plugs 22, between the top wall surface and the branch flow plug 22 close to the top wall surface, and between the bottom wall surface and the branch flow plug 22 close to the bottom wall surface. Specifically, the two ends of the fixed rib plate 21 are fixedly connected to the top wall surface and the bottom wall surface of the sound guide channel 13, and the branch flow plug 22 is fixedly connected to the fixed rib plate 21. The fixed rib plate 21 plays a fixing role for the branch flow plug 22, so as to install the branch flow plug 22 in the sound guide channel 13 to realize the branch flow of sound waves. It can be understood that the branch flow plug 22 extends in the sound guide channel 13, and there is a gap between adjacent two branch flow plugs 22, and there are also gaps between the top wall surface and the branch flow plug 22 close to the top wall surface, and between the bottom wall surface and the branch flow plug 22 close to the bottom wall surface, to form branch flow channels. In the embodiment, the extension direction of the branch flow plug 22 is parallel to the long side of the cross section of the loudspeaker.

[0049] As Figures 2 to 4As shown, in another embodiment, the sound splitting structure 2 comprises the fixed rib plate 21 and a flow splitting plug 22, and the partial sound guide channel 13 is divided into a first flow splitting channel 131 and a second flow splitting channel 132 by the flow splitting plug 22 along the first direction; along the first direction, the opposite two walls of the first flow splitting channel 131 are parallel and the distance is S1, the opposite two walls of the second flow splitting channel 132 are parallel and the distance is S2, S1=S2; specifically, the cross-sectional areas of the first flow splitting channel 131 and the second flow splitting channel 132 can be the same or different; in this embodiment, the flow splitting plug 22 divides the sound guide channel 13 into two flow splitting channels with the same cross-sectional area: the first flow splitting channel 131 and the second flow splitting channel 132, and the sound waves are uniformly split by the first flow splitting channel 131 and the second flow splitting channel 132 and then transmitted out through the sound outlet 12, so that the frequency response curve of the output sound waves is more flat, thereby improving the sound quality and sound effect.

[0050] As shown in Figure 3 and Figure 4 shown, in the case that the fixed rib plate 21 fixedly installs the flow splitting plug 22 in the sound guide channel 13, the number of the fixed rib plate 21 can be set according to actual conditions, for example, only one can be set, or multiple can be set, as long as the flow splitting plug 22 can be firmly connected with the top wall and the bottom wall of the sound guide channel 13; specifically, the flow splitting plug 22 extends along the long axis direction of the loudspeaker, and along the long axis direction of the loudspeaker, the two ends of the flow splitting plug 22 can be connected with the two side walls of the sound guide channel 13 or there can be a gap, which is not limited here; along the long axis direction of the loudspeaker, the flow splitting plug 22 can be a whole structure or a split structure composed of multiple interval arranged plug bodies, and at least one fixed rib plate 21 is arranged on each plug body to ensure the reliable connection of the plug body and the shell 1. In this embodiment, the flow splitting plug 22 is a whole structure connected to the side walls of the sound guide channel 13 at both ends, and along the long axis direction of the loudspeaker, five fixed rib plates 21 are symmetrically arranged in the sound guide channel 13.

[0051] As shown in Figure 1 and Figure 2 shown, along the propagation direction of the sound waves, the end of the flow splitting plug 22 close to the sound inlet 11 is a sound splitting end 221; along the propagation direction of the sound waves, the cross-sectional area of the sound guide channel 13 between the sound splitting end 221 and the sound inlet 11 gradually decreases, thereby forming a funnel structure, which is conducive to the gathering of sound waves to pass through the sound guide channel 13; specifically, along the propagation direction of the sound waves, the sound guide channel 13 before the sound splitting end 221 is a funnel structure, and the sound waves are gathered to the flow splitting plug 22 through the funnel structure, forming a high sound pressure energy, which avoids the sound waves being too dispersed to cause poor flatness of the sound wave curve after splitting.

[0052] Further, along the direction of sound wave propagation, the end of the flow dividing plug 22 close to the sound outlet 12 can be flush with the sound outlet 12, can extend out of the sound outlet 12 or be located in the sound guide channel 13; in the embodiment, the end of the flow dividing plug 22 close to the sound outlet 12 is located in the sound guide channel 13, thus effectively avoiding damage of the end of the flow dividing plug 22 caused by collision with foreign matters.

[0053] In order to further improve the sound output effect of the sound guide device, as shown in Figure 3 and Figure 4 , the shell 1 is provided with pressure relief holes 14, and the sound guide channel 13 is communicated with the outside through the pressure relief holes 14; specifically, a plurality of pressure relief holes 14 are provided, and the middle and high frequency sound waves in the sound guide channel 13 can be released through the pressure relief holes 14, thereby reducing the peak energy of the middle and high frequency sound waves generated by the loudspeaker, so that the frequency response curve emitted from the sound guide device is more flat. Figure 8 is a sound pressure level curve comparison diagram of the sound guide device provided by the embodiment and the sound guide device without pressure relief holes 14; wherein the scheme is the sound guide device provided by the embodiment and provided with pressure relief holes 14, and the original scheme is the ordinary sound guide device without pressure relief holes 14, the horizontal coordinate in the diagram represents the sound frequency, the unit is Hz, and the vertical coordinate represents the sound pressure level, the unit is dB. From Figure 8 it can be seen that, compared with the ordinary sound guide device without pressure relief holes 14, the frequency response curve of the sound middle and high frequency part in the scheme is more flat, thus having better output sound quality.

[0054] Figure 9 is the directivity frequency response curve diagram of the sound guide device provided by the embodiment, in the embodiment, part of the sound guide channel 13 is divided into the first flow dividing channel 131 and the second flow dividing channel 132 by the flow dividing plug 22, the shell 1 is provided with pressure relief holes 14, and the end of the flow dividing plug 22 close to the sound outlet 12 is located in the sound guide channel 13; specifically, the horizontal coordinate in the diagram represents the sound frequency, the unit is Hz, and the vertical coordinate represents the sound pressure level, the unit is dB; from Figure 9 it can be seen that, the middle and high frequency part at the 60° and 90° off-axis positions has small attenuation, thus the sound guide device has a wide sound field with good sound output effect, thus being able to meet the sound playing requirements of large screen multimedia equipment.

[0055] In the embodiment, as shown in Figure 3 and Figure 4As shown, the pressure relief hole 14 is pasted with a breathable damping material 4, which can make the medium-high frequency sound waves slowly leak to the outside through the pressure relief hole 14, avoid the sound pressure instability in the sound guide channel 13 caused by the rapid release of sound waves, and further improve the flatness of the frequency response curve of the sound guide device. Specifically, the damping material 4 can be non-woven fabric, open-cell foam, and fiber material, etc. The air permeability and thickness of the damping material 4 can be set according to actual needs, as long as it can improve the flatness of the final output frequency response curve.

[0056] Further, the sound guide device further comprises a Helmholtz resonance structure 3 with a preset resonance frequency. The Helmholtz resonance structure 3 is a sound resonance system commonly used in the art, which can absorb sound waves of a specific frequency through resonance principle. The preset resonance frequency of the Helmholtz resonance structure 3 is calculated according to actual noise reduction needs or the frequency of the standing wave generated in the sound guide channel 13; the Helmholtz resonance structure 3 can absorb the standing wave generated in the sound guide channel 13 to effectively reduce the noise generated by the loudspeaker, thereby improving the sound effect of the sound guide device.

[0057] As shown in Figure 1 and Figure 7 The embodiment also provides an amplification device, which comprises a loudspeaker and the sound guide device described above. The shell 1 is connected to the loudspeaker, and the sound inlet 11 is arranged opposite to the sound film 200 of the loudspeaker. In this embodiment, the shell 1 of the sound guide device is connected to the loudspeaker, and the sound inlet 11 is arranged opposite to the sound film 200 of the loudspeaker. The sound outlet 12 of the sound guide device is arranged opposite to the sound playing port of the multimedia device. Therefore, the sound emitted by the loudspeaker can be emitted outward through the sound guide device, so that the multimedia device emits sound. The amplification device solves the problem that the loudspeaker cannot completely face the sound playing port of the multimedia device, and can effectively reduce the energy loss of the medium-high frequency of the sound wave by shunting the sound wave along the first direction. In addition, the sound emitted from different positions along the length direction of the sound playing port of the multimedia device has better sound effect and sound quality.

[0058] Specifically, the amplification device is arranged inside the multimedia device shell 100. It can be understood that the specific installation position of the amplification device is set according to the actual structure of the multimedia device, for example, it can be arranged on the top, both sides or bottom of the multimedia device shell 100, which is not limited herein, as long as the sound outlet 12 of the sound guide device is arranged opposite to the sound playing port of the multimedia device.

[0059] In order not to affect the sound emitting effect of the loudspeaker, as shown in Figure 2As shown, along the propagation direction of the sound wave, the end of the sound-dividing structure 2 closest to the diaphragm 200 has a clearance distance H from the diaphragm 200, and the clearance distance H is greater than the maximum amplitude of the diaphragm 200. Specifically, along the propagation direction of the sound wave, the end of the diverter plug 22 closest to the speaker diaphragm 200 is the sound-dividing end 221. The clearance distance H between the sound-dividing end 221 and the diaphragm 200 is greater than the maximum amplitude of the diaphragm 200, so the diverter plug 22 does not interfere with the vibration of the diaphragm 200. The end surface of the sound-dividing end 221 can be flat or have a structure that matches the shape of the diaphragm 200, such as a wavy or S-shaped structure.

[0060] Example 1

[0061] like Figure 5 As shown, the Helmholtz resonance structure 3 includes a resonance cavity 31 provided inside the diverter plug 22 and a narrow opening 32 provided on the diverter plug 22. The resonance cavity 31 is connected to the sound guide channel 13 through the narrow opening 32. Specifically, the volume of the resonance cavity 31 is calculated according to the formula It can be obtained by reverse deduction, where: f is the preset resonant frequency, c is the speed of sound, S is the cross-sectional area of ​​the narrow opening 32 , L is the length of the narrow opening 32 , and V is the volume of the resonance cavity 31 .

[0062] Specifically, the specific shape of the resonance cavity 31 can be set according to actual conditions, for example, it can be a sphere, a cylinder, a cuboid, etc., as long as its volume V satisfies the calculation result of the above formula. It is understandable that only one Helmholtz resonance structure 3 can be set, or multiple can be set to absorb multiple standing waves of different frequencies; specifically, when multiple Helmholtz resonance structures 3 are set, multiple groups of resonance cavities 31 and narrow openings 32 can be set, or multiple narrow openings 32 can be set on one resonance cavity 31, and multiple narrow openings 32 share one resonator 31 to form multiple Helmholtz resonance structures 3. Then, the resonance cavities 31 of the multiple Helmholtz resonance structures 3 have the same volume, and the resonance frequencies of the Helmholtz resonance structures 3 formed by the resonance cavities 31 and different narrow openings 32 are different. The length and cross-sectional area of ​​different narrow openings 32 can be determined according to the resonance frequency to be set.

[0063] Example 2

[0064] like Figure 6 As shown, a baffle plate 15 is provided on the shell 1, and a closed resonance cavity 31 is provided between the baffle plate 15 and the shell 1. The Helmholtz resonance structure 3 includes the resonance cavity 31 and a narrow opening 32 opened on the shell 1. The resonance cavity 31 is connected to the sound guide channel 13 through the narrow opening 32. Specifically, the volume of the resonance cavity 31 is calculated according to the formula It can be obtained by reverse deduction, where: f is the preset resonant frequency, c is the speed of sound, S is the cross-sectional area of ​​the narrow opening 32 , L is the length of the narrow opening 32 , and V is the volume of the resonance cavity 31 .

[0065] Specifically, the enclosure plate 15 is integrally formed with the shell 1, and the specific arrangement position of the enclosure plate 15 can be determined according to actual conditions, as long as the enclosure plate 15 is connected with the shell 1 to form a closed resonance cavity 31, and the position of the resonance cavity 31 formed by the enclosure plate 15 does not coincide with the pressure relief hole 14; for example, the pressure relief hole 14 is arranged in the part of the shell 1 where the top wall of the sound guide channel 13 is located, the enclosure plate 15 and the narrow opening 32 are arranged in the part of the shell 1 where the bottom wall of the sound guide channel 13 is located, and the pressure relief hole 14 and the enclosure plate 15 can also be arranged in the part of the shell 1 where the top wall or the bottom wall of the sound guide channel 13 is located, and the pressure relief hole 14 and the enclosure plate 15 are arranged in the long axis direction of the loudspeaker. The specific shape of the resonance cavity 31 can be set according to actual conditions, for example, it can be a sphere, a cylinder or a cuboid, as long as its volume V meets the calculation of the above formula.

[0066] It can be understood that the Helmholtz resonance structure 3 can be arranged only one or multiple to absorb multiple standing waves of different frequencies; specifically, when multiple Helmholtz resonance structures 3 are arranged, multiple sets of resonance cavities 31 and narrow openings 32 can be arranged, or multiple narrow openings 32 can be arranged on one resonance cavity 31, multiple narrow openings 32 share one resonance cavity 31, and multiple Helmholtz resonance structures 3 are formed, the volumes of the resonance cavities 31 of the multiple Helmholtz resonance structures 3 are the same, the resonance frequencies of the Helmholtz resonance structures 3 formed by the resonance cavities 31 and different narrow openings 32 are different, and the lengths and cross-sectional areas of the different narrow openings 32 can be determined according to the resonance frequencies to be arranged.

[0067] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. It is not necessary and impossible to exhaust all embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A sound guide device, characterized in that: include: A housing (1), the housing (1) having a sound inlet (11) and a sound outlet (12), the sound inlet (11) of the housing (1) being arranged facing a loudspeaker, and the sound outlet (12) of the housing (1) being arranged facing a sound playback port of a multimedia device, and along the propagation direction of sound waves, the sound inlet (11) is connected to the sound outlet (12) via a sound guide channel (13); A sound separation structure (2), wherein the sound separation structure (2) is arranged in the sound guide channel (13), an angle a is formed between an extension direction of the sound separation structure (2) and a long side of the speaker cross section, and the angle a is not greater than an angle b between a diagonal line of the speaker cross section and the long side of the speaker cross section, and the sound separation structure (2) separates a portion of the sound guide channel (13) into at least two diversion channels along a first direction, wherein the first direction is perpendicular to the extension direction of the sound separation structure (2).

2. The sound guide device according to claim 1, wherein The sound separation structure (2) comprises a fixed rib (21) and at least two diverter plugs (22); Along the first direction, the two ends of the fixed rib (21) are respectively fixedly connected to the top wall and the bottom wall of the sound guide channel (13), at least two diverter plugs (22) are spaced apart and connected to the fixed rib (21) along the first direction, and the diverter channel is formed between two adjacent diverter plugs (22), between the top wall and the diverter plug (22) close to the top wall, and between the bottom wall and the diverter plug (22) close to the bottom wall.

3. The sound guide device according to claim 1, wherein The sound separation structure (2) comprises a fixed rib (21) and a diverter plug (22); along the first direction, part of the sound guide channel (13) is divided into a first diverter channel (131) and a second diverter channel (132) by the diverter plug (22); Along the first direction, the two opposite walls of the first diversion channel (131) are parallel and the distance between them is S1, and the two opposite walls of the second diversion channel (132) are parallel and the distance between them is S2, where S1 = S2.

4. The sound guide device according to any one of claims 2 to 3, characterized in that: The sound guide device further comprises a Helmholtz resonance structure (3), wherein the Helmholtz resonance structure (3) comprises a resonance cavity (31) arranged inside the diverter plug (22) and a narrow opening (32) opened on the diverter plug (22), wherein the resonance cavity (31) is connected to the sound guide channel (13) through the narrow opening (32).

5. The sound guide device according to any one of claims 2 to 3, characterized in that: The sound guide device also includes a Helmholtz resonance structure (3), a baffle plate (15) is provided on the shell (1), a closed resonance cavity (31) is provided between the baffle plate (15) and the shell (1), the Helmholtz resonance structure (3) includes the resonance cavity (31) and a narrow opening (32) opened on the shell (1), and the resonance cavity (31) is connected to the sound guide channel (13) through the narrow opening (32).

6. The sound guide device according to claim 3, characterized in that Along the propagation direction of the sound wave, the end of the diverter plug (22) close to the sound inlet (11) is a sound diverter end (221); Along the propagation direction of the sound wave, the cross-sectional area of ​​the sound guide channel (13) between the sound splitting end (221) and the sound inlet (11) gradually decreases.

7. The sound guide device according to claim 1, wherein A pressure relief hole (14) is provided on the housing (1), and the sound guide channel (13) is connected to the outside through the pressure relief hole (14).

8. The sound guide device according to claim 7, wherein: The pressure relief hole (14) is covered with a breathable damping material (4).

9. A sound amplification device, characterized in that The invention comprises a loudspeaker and the sound guide device according to any one of claims 1 to 8, wherein the housing (1) is connected to the loudspeaker, and the sound inlet (11) is arranged facing the sound membrane (200) of the loudspeaker.

10. The sound amplification device according to claim 9, characterized in that Along the propagation direction of the sound wave, there is an avoidance distance H between the end of the sound separation structure (2) close to the sound membrane (200) and the sound membrane (200), and the avoidance distance H is greater than the maximum amplitude of the sound membrane (200).

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