A low-frequency sound pressure level enhancement speaker and its enclosure

Abstract

This invention relates to a low-frequency sound pressure level (SPL) enhancement speaker enclosure and its cabinet. The enclosure includes a speaker enclosure and a subwoofer. The enclosure has a cavity and a subwoofer output, which consists of a mounting port and a sound wave radiation window. The mounting port and the sound wave radiation window connect the cavity to the outside environment, and are completely separated on the enclosure. The subwoofer is mounted in a sealed manner on the enclosure through the mounting port and generates low-frequency reverse waves radiating into the cavity during vibration. These reverse waves are then radiated into the outside air through the sound wave radiation window. In this invention, sound waves within the enclosure cavity can be radiated into the outside air through the sound wave radiation window, allowing sound waves behind the speaker to be utilized, thereby enhancing the low-frequency SPL and improving sound quality. This low-frequency SPL enhancement speaker enclosure is characterized by its simple structure, ease of acoustic parameter adjustment, and low cost.

Description

Technical Field

[0001] This invention relates to the field of speaker technology, and more specifically, to a low-frequency sound pressure level enhancement speaker and its enclosure. Background Technology

[0002] In a speaker enclosure with a woofer, the woofer's diaphragm is exposed outside the enclosure. When the woofer diaphragm vibrates, there is vibration in front of the woofer, generating low-frequency sound waves. These low-frequency sound waves travel through the air and reach the listener's ear. However, there is also vibration behind the woofer. These low-frequency sound waves are trapped inside the enclosure and not utilized, resulting in wasted low-frequency sound waves that affect the low-frequency sound pressure level and, consequently, the sound quality. Summary of the Invention

[0003] To address the aforementioned deficiencies in the prior art, this invention provides an improved low-frequency sound pressure level enhancement speaker and its enclosure.

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct a low-frequency sound pressure level enhancing speaker for improving low-frequency sound pressure levels, wherein the low-frequency sound pressure level enhancing speaker comprises:

[0005] The speaker enclosure includes a cavity and a bass output outlet. The bass output outlet comprises a mounting port for a bass speaker and a sound wave radiation window for low-frequency reverse waves to radiate outwards from the cavity. The mounting port and the sound wave radiation window connect the cavity to the outside environment, and are completely separated from each other on the speaker enclosure.

[0006] The woofer is sealed and mounted on the speaker enclosure through the mounting port, and generates a low-frequency reverse wave that radiates into the cavity when it vibrates. The low-frequency reverse wave in the cavity is radiated into the outside air through the sound wave radiation window.

[0007] Preferably, the speaker enclosure includes a top wall, a bottom wall, and a side wall connecting the top wall and the bottom wall, and the top wall, the bottom wall, and the side wall together define the cavity; the sound wave radiation window is disposed on at least one of the top wall, the bottom wall, and the side wall.

[0008] Preferably, the sidewall includes at least one surface, and the acoustic radiation window and the mounting port are located on the same surface of the sidewall.

[0009] Preferably, the acoustic radiation window is one or more.

[0010] Preferably, one or more of the acoustic radiation windows are symmetrically arranged about the longitudinal central axis of the mounting port.

[0011] Preferably, the acoustic radiation window is in the shape of a straight aperture.

[0012] Preferably, the surface on the speaker enclosure where the sound wave radiation window is disposed is planar, and the sound wave radiation window has an inner side surface on the thickness of the speaker enclosure, and the inner side surface is perpendicular to the corresponding surface of the speaker enclosure.

[0013] Preferably, the cross-section of the acoustic radiation window is circular, square, or rectangular.

[0014] Preferably, the low-frequency sound pressure level enhancement speaker is a subwoofer, a mid-bass speaker, or a full-range speaker.

[0015] The present invention also provides a speaker enclosure, wherein the speaker enclosure is provided with a cavity and a bass sound outlet, and the bass sound outlet is composed of a mounting port for mounting a bass speaker and a sound wave radiation window;

[0016] The mounting port and the acoustic radiation window are respectively connected to the cavity and the outside, and the mounting port and the acoustic radiation window are completely separated on the speaker enclosure; the acoustic radiation window is used to radiate the low-frequency reverse wave generated by the woofer when it vibrates into the cavity into the outside air.

[0017] The low-frequency sound pressure level enhancement speaker and its enclosure, which implement the present invention, have the following beneficial effects:

[0018] By incorporating a sound wave radiation window on the speaker enclosure that connects the cavity to the outside environment, sound waves inside the enclosure (i.e., low-frequency sound waves behind the woofer) can be radiated into the ambient air through this window. This allows the sound waves behind the woofer to be utilized, thereby increasing the low-frequency sound pressure level and improving sound quality. Furthermore, achieving low-frequency sound pressure level enhancement solely through the sound wave radiation window is characterized by its simple structure, ease of acoustic parameter adjustment, low cost, and high effectiveness. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a low-frequency sound pressure level enhancement speaker according to one embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the front structure of the low-frequency sound pressure level enhancement speaker is shown.

[0022] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of a low-frequency sound pressure level enhancement speaker.

[0023] Figure 4 This is a cross-sectional structural diagram of a bass-reflex speaker in related technologies;

[0024] Figure 5 This is a comparison diagram of the sound pressure level of a low-frequency sound pressure level enhancement speaker in a specific embodiment of the present invention and a sealed speaker in related technologies;

[0025] Figure 6 This is a comparison diagram of the sound pressure level of a low-frequency sound pressure level enhancement speaker in a specific embodiment of the present invention and a bass-reflex speaker in related technologies;

[0026] Figure 7 This is a schematic diagram of the speaker enclosure in one embodiment of the present invention.

[0027] In the attached diagram, 10. Low-frequency sound pressure level enhancement speaker enclosure; 1. Speaker enclosure; 11. Cavity; 12. Bass output outlet; 121. Mounting port; 122. Sound wave radiation window; 1221. Inner side; 13. Top wall; 14. Bottom wall; 15. Side wall; 16. Mounting hole; 2. Bass speaker; 21. Voice coil; 22. Washer; 23. Magnet; 24. T-iron; 25. Drum; 3. Tweeter; 41. Bass reflex port; 42. Bass reflex hole. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing the technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0029] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When a component is referred to as being "on" or "below" another component, that component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components.

[0030] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0031] Figure 1 A low-frequency sound pressure level (SPL) enhancement speaker 10 is shown in one embodiment of the present invention. This SPL enhancement speaker 10 is used to increase the low-frequency sound pressure level. In this embodiment, by allowing the sound waves (i.e., the low-frequency sound waves behind the woofer 2) within the cavity 11 of the speaker enclosure 1 to radiate into the outside air, the sound waves behind the woofer 2 can also be utilized, thereby increasing the low-frequency sound pressure level and improving sound quality.

[0032] Combination Figures 1 to 3 As shown, the low-frequency sound pressure level enhancement speaker 10 includes a speaker enclosure 1 and a subwoofer 2. The speaker enclosure 1 is provided with a cavity 11 and a subwoofer output 12. The subwoofer output 12 consists of a mounting port 121 and a sound wave radiation window 122. The mounting port 121 connects the cavity 11 to the outside and is used for mounting the subwoofer 2. The sound wave radiation window 122 connects the cavity 11 to the outside and is used for radiating low-frequency reverse waves from inside the cavity 11 to the outside air, that is, for radiating the low-frequency reverse waves generated by the subwoofer 2 when it vibrates into the cavity 11 to the outside air.

[0033] The subwoofer 2 is sealed and mounted on the speaker enclosure 1 through the mounting port 121. When vibrating, it generates a low-frequency reverse wave that radiates into the cavity 11. The low-frequency reverse wave inside the cavity 11 is radiated into the outside air through the sound wave radiation window 122. Understandably, the subwoofer 2 also generates a low-frequency forward wave when vibrating. This forward wave radiates directly to the outside and reaches the ear after propagating through the air. Understandably, in this embodiment, the sound waves that radiate directly to the outside (i.e., the sound waves in front of the subwoofer 2) and the sound waves that radiate into the cavity 11 (i.e., the sound waves behind the subwoofer 2) generated when the subwoofer 2 vibrates are defined as the low-frequency forward wave and the low-frequency reverse wave, respectively.

[0034] In this embodiment, the bass output outlet 12 consists only of the mounting port 121 and the sound wave radiation window 122. That is, the low frequency sound pressure level is improved only through the sound wave radiation window 122. It has the characteristics of simple structure, easy acoustic parameter adjustment, low cost and good effect.

[0035] The mounting port 121 and the sound wave radiation window 122 are completely separated on the speaker cabinet 1. That is, the sound wave radiation window 122 and the mounting port 121 are spaced apart on the speaker cabinet 1 and are not connected on the speaker cabinet 1. This ensures the strength and firmness of the speaker cabinet 1 panel and facilitates the sealing and vibration reduction between the woofer 2 and the speaker cabinet 1 panel.

[0036] Understandably, the subwoofer 2 is sealed to the speaker enclosure 1 through the mounting port 121, meaning the subwoofer 2 is tightly mounted to the speaker enclosure 1, and the subwoofer 2 and the speaker enclosure 1 remain sealed. The sound wave radiation window 122 and the mounting port 121 are not connected on the speaker enclosure 1, but they are connected through the cavity 11.

[0037] The sound wave radiation window 122 may be disposed on at least one side of the speaker enclosure 1. Understandably, the speaker enclosure 1 has a three-dimensional structure and may include a top wall 13, a bottom wall 14, and a side wall 15 connecting the top wall 13 and the bottom wall 14, and the top wall 13, bottom wall 14, and side wall 15 together define the cavity 11. The sound wave radiation window 122 may be disposed on at least one of the top wall 13, bottom wall 14, and side wall 15.

[0038] Understandably, the sound wave radiation window 122 can be configured according to the installation method of the low-frequency sound pressure level enhancing speaker 10. Installation methods include placing it on the ground, on a table (vertical), or mounting it on a wall (wall-mounted), so that after the low-frequency sound pressure level enhancing speaker 10 is installed, the low-frequency reverse waves within the cavity 11 of the speaker enclosure 1 can be radiated into the air through the sound wave radiation window 122, propagating through the air before entering the ear. The sound wave radiation window 122 can be positioned away from the mounting surface of the speaker enclosure 1 to prevent obstruction of the outward propagation of the low-frequency reverse waves.

[0039] For example, when the low-frequency sound pressure level enhancing speaker 10 is a vertical speaker, the side of the speaker cabinet 1 used for installation is the bottom wall 14. The sound wave radiation window 122 can be positioned away from the bottom wall 14 to prevent obstruction of the low-frequency back waves radiating outward from the cavity 11. As another example, when the low-frequency sound pressure level enhancing speaker 10 is a wall-mounted speaker, the side of the speaker cabinet 1 used for installation is the side wall 15 facing the wall. If the sound wave radiation window 122 is located on the side wall 15 facing the wall, when one side wall 15 is completely flush with the wall, the wall will obstruct the low-frequency back waves radiating outward from the cavity 11. When there is a gap between one side wall 15 and the wall, the low-frequency back waves radiated from the cavity 11 are reflected by the wall and then enter the ear through the air. In this case, the low-frequency back wave is not a direct sound, and the perceived improvement in low-frequency sound pressure level will be weaker.

[0040] The sidewall 15 may include at least one surface, which may be planar or curved. Understandably, the speaker enclosure 1 may be in various three-dimensional shapes, such as a cuboid, cube, cylinder, or other regular or irregular shapes.

[0041] Understandably, when the speaker enclosure 1 is rectangular, the side wall 15 includes four faces, all of which are planar; when the speaker enclosure 1 is generally rectangular, the side wall 15 includes four faces, at least one of which may be curved; when the speaker enclosure 1 is cylindrical, the side wall 15 includes one face, which is curved. For ease of description, this embodiment will use a rectangular enclosure 1 as an example.

[0042] In this embodiment, the mounting port 121 can be installed on the side wall 15. Understandably, when using the low-frequency sound pressure level enhancement speaker 10, the side where the mounting port 121 is located can be considered the front, ensuring that the low-frequency positive wave generated by the subwoofer 2 is direct sound, resulting in a better listening experience. In other embodiments, the mounting port 121 can be located on other walls, such as the top wall 13. There can be one or more mounting ports 121, and each mounting port 121 is completely spaced apart on the speaker enclosure 1. The mounting ports 121 can be circular.

[0043] The acoustic radiation window 122 can be disposed on one or more sides of the side wall 15. In this embodiment, when the acoustic radiation window 122 is disposed on one side of the side wall 15, the acoustic radiation window 122 and the mounting port 121 are located on the same side of the side wall 15, so that the low-frequency reverse wave in the cavity 11 is directly radiated out from the acoustic radiation window 122. The low-frequency reverse wave is a direct sound, which is superimposed with the low-frequency forward wave. Therefore, in terms of listening, the improvement of the low-frequency sound pressure level can be clearly felt, and the improvement effect of the low-frequency sound pressure level is good.

[0044] Of course, in other embodiments, the acoustic radiation window 122 may be disposed on other sidewalls 15 besides the side where the mounting port 121 is located. For example, the acoustic radiation window 122 may be disposed on one or two sidewalls 15 adjacent to the sidewall 15 where the mounting port 121 is located; or, the acoustic radiation window 122 may be disposed on a wall portion opposite to the side where the mounting port 121 is located. In other embodiments, the acoustic radiation window 122 may be disposed on other wall portions. For example, the acoustic radiation window 122 may be disposed on the top wall 13.

[0045] The sound wave radiation window 122 and the mounting port 121 are spaced apart on the wall of the speaker enclosure 1. In this embodiment, the sound wave radiation window 122 and the mounting port 121 are spaced apart on the side wall 15, and the sound wave radiation window 122 can be symmetrically arranged about the longitudinal central axis of the mounting port 121.

[0046] Understandably, the mounting port 121 can be circular, with its longitudinal central axis passing through the center of the port and parallel to the axis along the height of the speaker enclosure 1. The sound wave radiation window 122 is symmetrically positioned about the longitudinal central axis of the mounting port 121, meaning it is symmetrically distributed left and right about the longitudinal central axis of the port 121, so that the same or similar sound quality can be perceived on both sides of the low-frequency sound pressure level enhancement speaker 10.

[0047] The acoustic radiation window 122 may be one or more. When there is one acoustic radiation window 122, it may be disposed on one or more wall portions. For example, the acoustic radiation window 122 may be disposed on the same side wall 15 as the mounting port 121, or on a side wall 15 adjacent to the side wall 15 where the mounting port 121 is located, or on other wall portions; or the mounting port 121 may be continuously disposed on two or more side walls 15, for example, the acoustic radiation window 122 may be continuously disposed on the side wall 15 where the mounting port 121 is located and on the wall portions adjacent to the side wall 15 where the mounting port 121 is located. Preferably, the acoustic radiation window 122 is disposed on the same side wall 15 as the mounting port 121, and the acoustic radiation window 122 is symmetrical with respect to the longitudinal central axis of the mounting port 121.

[0048] When there are two or more sound wave radiation windows 122, these two or more sound wave radiation windows 122 can be disposed on one or more wall portions. For example, the two or more sound wave radiation windows 122 can all be disposed on the same side wall 15 as the mounting port 121, or respectively disposed on two side walls 15 adjacent to the side wall 15 where the mounting port 121 is located, or respectively disposed on the side wall 15 where the mounting port 121 is located and other wall portions. Preferably, the two or more sound wave radiation windows 122 are disposed on the side wall 15 where the mounting port 121 is located, and the sound wave radiation windows 122 are symmetrical with respect to the longitudinal central axis of the mounting port 121. It can be understood that when the sound wave radiation windows 122 are respectively disposed on two side walls 15 adjacent to the side wall 15 where the mounting port 121 is located, and the sound wave radiation windows 122 on the two side walls 15 are symmetrical with respect to the longitudinal central axis of the mounting port 121, the same or similar sound quality effect can be felt on both the left and right sides.

[0049] The sound wave radiation window 122 is configured with a certain shape. In this embodiment, the cross-section of the sound wave radiation window 122 can be circular, square, or rectangular. Understandably, before mass production of the low-frequency sound pressure level enhancement speaker 10, its acoustic parameters need to be adjusted. That is, by modifying the area of ​​the sound wave radiation window 122, the opening of the sound wave radiation window 122 of the low-frequency sound pressure level enhancement speaker 10 is determined based on the sound quality effect under each area of ​​the sound wave radiation window 122, so as to obtain a better sound quality effect.

[0050] Understandably, when the cross-section of the acoustic radiation window 122 is circular, square, or rectangular, its regular shape makes it easy to adjust the size of the area, thus facilitating the tuning of acoustic parameters. Of course, in other embodiments, the acoustic radiation window 122 may have other regular shapes besides those described above, such as triangles, parallelograms, etc.; the acoustic radiation window 122 may also be irregularly shaped.

[0051] like Figure 3 As shown, the acoustic radiation window 122 connects the cavity 11 with the outside, that is, the acoustic radiation window 122 penetrates the inner and outer wall surfaces of the corresponding wall portion of the speaker enclosure 1, and the acoustic radiation window 122 has an inner surface 1221 on the wall thickness. In this embodiment, the acoustic radiation window 122 is in the shape of a straight hole, that is, the cross-section of the acoustic radiation window 122 from the inner wall surface to the outer wall surface is coaxial, the same size, and the same shape; that is, when projected towards the depth direction of the speaker enclosure 1, the acoustic radiation window 122 overlaps on a pattern of the same shape and size.

[0052] In this embodiment, the surface of the speaker enclosure 1 with the sound wave radiation window 122 is planar, and the inner surface 1221 of the sound wave radiation window 122 is perpendicular to the corresponding surface of the speaker enclosure 1. That is, the inner surface 1221 of the sound wave radiation window 122 is perpendicular to the wall surface where the sound wave radiation window is located, which facilitates the direct radiation of low-frequency reverse waves from the sound wave radiation window 122, resulting in better performance. It can be understood that the sound wave radiation window 122 is a straight aperture, which is beneficial for the direct radiation of low-frequency reverse waves. If the inner surface 1221 of the sound wave radiation window 122 is inclined, the radiation angle of the low-frequency reverse waves will be changed, which is not conducive to the direct radiation of low-frequency reverse waves.

[0053] The sound wave radiation window 122 can be disposed in a speaker enclosure with a woofer 2. Of course, the low-frequency sound pressure level enhancement speaker enclosure 10 may also include a midrange speaker and / or a tweeter 3. Figures 1 to 3 The tweeter 3 is shown, but the midrange speaker is not shown. The speaker enclosure 1 may be provided with mounting holes 16 for mounting the midrange speaker and tweeter 3. The mounting holes 16 connect the cavity 11 to the outside, and the mounting holes 16 are completely separated from the mounting opening 121 and the sound wave radiation window 122 on the wall of the speaker enclosure 1, so as to facilitate the sealing and vibration reduction between the midrange speaker, tweeter 3 and the panel of the speaker enclosure 1.

[0054] In this embodiment, the mounting hole 16 and the mounting opening 121 are located on the same wall, and their centers are on the same axis. The mounting hole 16 is adapted to the midrange speaker and / or tweeter 3, and the mounting hole 16 can be square. There can be one or more mounting holes 16. In embodiments where there are two or more mounting holes 16, each mounting hole 16 is completely separated in the speaker enclosure 1.

[0055] The sound wave radiation window 122 can be disposed in a speaker enclosure with a woofer 2. For example, the sound wave radiation window 122 can be disposed in a subwoofer enclosure with a woofer 2, a mid-bass enclosure with a woofer 2, or a full-range enclosure with a woofer 2. Therefore, the low-frequency sound pressure level enhancement speaker 10 can be a subwoofer enclosure, a mid-bass enclosure, or a full-range enclosure. Understandably, a subwoofer enclosure can only contain a subwoofer, that is, the woofer 2 can be a subwoofer; a mid-bass enclosure can contain a woofer 2 and a midrange speaker.

[0056] In the low-frequency sound pressure level enhancement speaker 10, the number of each speaker can be set according to needs. Understandably, for the same type of speakers, doubling the number will increase the sound pressure level by 3dB.

[0057] Typically, a subwoofer is equipped with one subwoofer speaker; a mid-bass speaker is equipped with one midrange speaker and one woofer 2; a full-range speaker is equipped with one woofer 2 and one tweeter 3, or two woofer 2 and one tweeter 3, or one woofer 2, one midrange speaker and one tweeter 3.

[0058] In a low-frequency sound pressure level enhancement speaker 10, the total area of ​​the sound wave radiation window 122 can be set according to several factors, including the "speaker cabinet 1 size", "number of speaker units", "speaker unit parameters", and "design goals".

[0059] Understandably, the "speaker enclosure 1 size," structurally speaking, is generally determined by the maximum outer diameter and height of the speaker unit. That is, the design of the speaker enclosure 1 must at least ensure that the speaker unit can be installed. From a performance perspective, to ensure the speaker unit performs at its best when designing the speaker enclosure 1 size, simulation software is needed to calculate the optimal speaker enclosure 1 size and the total area of ​​the sound wave radiation window 122. Specifically, the speaker enclosure 1 for a 6-inch speaker unit is approximately 6L, for an 8-inch speaker unit it is approximately 8L, for a 10-inch speaker unit it is approximately 20L, and for a 12-inch speaker unit it is approximately 35L.

[0060] In the "number of loudspeaker units", the total area of ​​the sound wave radiation window 122 is mainly affected by the number of woofers 2. For every doubling of the number of woofers 2, the total area of ​​the sound wave radiation window 122 needs to be doubled.

[0061] The "loudspeaker unit parameters" include 15 commonly used parameters such as "Fb (lowest resonant frequency of the speaker enclosure)," "F0 (lowest resonant frequency of the loudspeaker unit)," "Qtc," "IMP," and "SPL." The area of ​​the sound wave radiation window 122 is mainly determined by Fb (lowest resonant frequency of the speaker enclosure) in the "loudspeaker unit parameters," and the two are positively correlated. The lower the Fb, the smaller the total area of ​​the sound wave radiation window 122; the higher the Fb, the larger the total area of ​​the sound wave radiation window 122. Fb is mainly positively correlated with F0 (lowest resonant frequency of the loudspeaker unit).

[0062] The main "design goal" of the speaker is Fb (the lowest resonant frequency of the speaker). The larger the total area of ​​the sound wave radiation window 122, the higher the Fb, and the worse the low-frequency sound effect of the speaker. Therefore, to achieve the ideal Fb, the appropriate total area of ​​the sound wave radiation window 122 is required.

[0063] Understandably, the total area of ​​the sound wave radiation window 122 is related to four factors: “speaker cabinet 1 size”, “number of speaker units”, “speaker unit parameters”, and “design goals”. The total area of ​​the sound wave radiation window 122 can be set according to these four factors.

[0064] The number of acoustic radiation windows 122 can be set according to the total area requirement of the acoustic radiation windows 122. That is, when setting one acoustic radiation window 122 can meet the total area requirement, only one acoustic radiation window 122 can be set, which is convenient for production and debugging. When only one acoustic radiation window 122 can be set in a certain area on a wall, and the area of ​​the acoustic radiation window 122 is smaller than the required total area, then more acoustic radiation windows 122 need to be set in different locations on the same wall or on different walls, so that the sum of the areas of all acoustic radiation windows 122 is equal to the total required area of ​​the acoustic radiation windows 122, thereby meeting the area requirement of the acoustic radiation windows 122.

[0065] Understandably, the sound wave radiation window 122 is symmetrically arranged about the longitudinal central axis of the mounting port 121. That is, the shape, area and height of the sound wave radiation window 122 on the speaker cabinet 1 are symmetrically distributed about the longitudinal central axis of the mounting port 121.

[0066] The size range (or cross-sectional area range) of the acoustic radiation window 122 is typically between 1% and 20% of the effective vibrating area of ​​the woofer 2. The following describes the size setting of the acoustic radiation window 122 using two specific embodiments.

[0067] In one specific embodiment, the low-frequency sound pressure level enhancement speaker 10 is a 6-inch full-range speaker. The speaker enclosure 1 has an internal height of 550mm * width of 150mm * depth of 140mm, a thickness of 15mm, and a sound wave radiation window 122 with a length of 150mm and a width of 10mm (i.e., a total area of ​​1500mm²). 2 It employs two 6.5-inch woofers 2 and one tweeter 3. The effective vibrating area of ​​the woofer 2 is 2*13273mm². 2 It can be seen that the ratio of the total area of ​​the sound wave radiation window 122 to the effective vibrating area of ​​the woofer 2 is 1500 mm². 2 / 2*13273mm 2 =5.6%, between 1% and 20%.

[0068] In another specific embodiment, the low-frequency sound pressure level enhancement speaker 10 is a 6-inch full-range speaker. The speaker enclosure 1 has an internal height of 650mm * width of 270mm * depth of 140mm, a thickness of 15mm, and a sound wave radiation window 122 with a length of 200mm and a width of 12mm (i.e., a total area of ​​2400mm²). 2 It employs two 8-inch woofers 2 and one tweeter 3. The effective vibrating area of ​​the woofer 2 is 2*22167mm². 2 It can be seen that the ratio of the total area of ​​the sound wave radiation window 122 to the effective vibrating area of ​​the woofer 2 is 2400 mm². 2 / 2*22167mm 2 =5.4%, between 1% and 20%.

[0069] In related technologies, bass-reflex speakers are used to increase low-frequency sound pressure levels, such as... Figure 4 As shown, the difference between a bass-reflex speaker and a low-frequency sound pressure level booster speaker 10 is that the bass-reflex speaker's bass output outlet 12 includes a mounting port 121, a bass reflex tube 41, and a bass reflex port 42. The bass reflex tube 41 is installed inside the cavity 11 of the bass-reflex speaker enclosure, and the bass reflex port 42 is located on the speaker enclosure 1, connecting the bass reflex tube 41 to the outside. That is, the bass-reflex speaker achieves low-frequency sound pressure level boosting through the bass reflex tube 41 and the bass reflex port 42.

[0070] Combination Figure 4 As shown, the working process and principle of a bass-reflex speaker are as follows:

[0071] When an audio signal is input to the woofer 2 in the bass reflex enclosure, the voice coil 21 of the woofer 2, together with the magnetic circuit system consisting of the washer 22, magnet 23, and T-iron 24, generates a repulsive force, forcing the voice coil 21 to vibrate up and down. This, in turn, causes the diaphragm 25 of the woofer 2 to move up and down. During this up-and-down movement, the diaphragm 25 radiates sound waves (i.e., low-frequency forward waves) directly into the air by compressing the air in front of it, transmitting the sound to the ear. Simultaneously, it radiates sound waves (i.e., low-frequency reverse waves) into the bass reflex enclosure by compressing the air behind it. Because low-frequency signals have relatively long wavelengths (e.g., a 100Hz signal with a wavelength of 3.44MHz, 344MHz / 100Hz = 3.44MHz), they are easily reflected within the bass reflex enclosure and flow through the bass reflex tube 41. When these sound waves pass through the bass reflex tube 41, they are reflected and resonate within the tube and radiate outwards from the bass reflex port 42 (e.g., ...). Figure 4 As indicated by the arrow in the diagram, the presence of reflection and resonance within the bass reflex tube 41 increases the low-frequency sound pressure level of the bass reflex enclosure. The human ear can perceive this increase in low-frequency sound pressure level.

[0072] The bass-reflex speaker achieves low-frequency sound pressure level enhancement through both the bass reflex tube 41 and the bass reflex port 42. Compared to the low-frequency sound pressure level enhancement speaker 10, which only enhances the low-frequency sound pressure level through the sound wave radiation window 122, the former has more complex assembly processes and higher costs. Moreover, the bass reflex tube 41 generates wind noise, affecting the sound quality. When adjusting acoustic parameters, it is necessary to adjust the aperture of the bass reflex port 42, the aperture and length of the bass reflex tube 41 simultaneously, which is inconvenient to operate.

[0073] In this embodiment, combined with Figure 3 As shown, the working process and principle of the low-frequency sound pressure level enhancement speaker 10 are as follows:

[0074] When an audio signal is input to the woofer 2 in the speaker enclosure 1, the voice coil 21 of the woofer 2, together with the magnetic circuit system consisting of the washer 22, magnet 23, and T-iron 24, generates a repulsive force, forcing the voice coil 21 to vibrate up and down. This, in turn, causes the diaphragm 25 of the woofer 2 to move up and down. During this up-and-down movement, the diaphragm 25 compresses the air in front of it, directly radiating sound waves (i.e., low-frequency forward waves) into the air, transmitting the sound to the ear. Simultaneously, it compresses the air behind the diaphragm 25, radiating sound waves (low-frequency reverse waves) into the speaker enclosure 1. Because the sound waves are reflected within the speaker enclosure 1, and because the wavelength of low-frequency signals is relatively long (e.g., a 100Hz signal, wavelength = 3.44M, 344M / 100Hz = 3.44M), after reflection within the speaker enclosure 1, the sound waves are directly radiated into the air through the sound wave radiation window 122 of the speaker enclosure 1 (e.g., low-frequency forward waves). Figure 3(As shown by the arrow in the image), it transmits sound to the human ear.

[0075] The low-frequency sound pressure level enhancement speaker 10 in this embodiment can enhance the low-frequency sound pressure level simply through the sound wave radiation window 122, which simplifies the speaker splicing process and reduces costs; moreover, it does not generate wind noise, resulting in better sound quality; when adjusting acoustic parameters, only the diameter of the sound wave radiation window 122 needs to be adjusted, which facilitates the adjustment of acoustic parameters.

[0076] The following comparison is made between the low-frequency sound pressure level of the "low-frequency sound pressure level enhancement speaker 10" in this embodiment and the "sealed speaker (i.e. without sound wave radiation window 122)" in related technologies.

[0077] Sealed speaker enclosure: 6-inch full-range speaker, internal dimensions 550mm (height) x 150mm (width) x 140mm (depth), enclosure thickness 15mm. It employs a design with two 6.5-inch woofers (2) and one 1-inch tweeter (3). The effective vibrating area of ​​the woofers (2) is 2 x 13273mm². 2 .

[0078] Low-frequency sound pressure level enhanced speaker 10 (speaker cabinet 1 has a sound wave radiation window 122): 6-inch full-range speaker, internal height 550mm * width 150mm * depth 140mm, cabinet thickness 15mm, sound wave radiation window 122 length 150mm * width 10mm (area 1500mm²) 2 The design employs two 6.5-inch woofers (2) and one 1-inch tweeter (3). The effective vibrating area of ​​the woofers (2) is 2*13273mm². 2 The ratio of the sound wave radiation window 122 to the effective vibrating area of ​​the woofer 2 is 1500 mm². 2 / (2*13273mm 2 =5.6%.

[0079] The sound pressure level of the low-frequency sound pressure level enhancement speaker 10 and the sealed speaker are as follows: Figure 5 As shown in the figure, the dashed line represents the sound pressure level curve of the "sealed speaker" in the related art, and the thick solid line represents the sound pressure level curve of the "low-frequency sound pressure level enhancement speaker 10" in this embodiment. The horizontal axis represents the frequency value, and the vertical axis represents the sound pressure level in dB. It can be seen from the figure that in the 90-250Hz frequency band on the horizontal axis, the sound pressure level of the "low-frequency sound pressure level enhancement speaker 10" in this embodiment is 1-13 dB higher than that of the "sealed speaker" in the related art. Understandably, the 90-250Hz frequency band belongs to the low-frequency band.

[0080] That is, with other factors of the speaker set the same, by setting a sound wave radiation window 122 on the speaker cabinet 1, the low frequency sound pressure level can be effectively improved, resulting in better sound quality.

[0081] The following comparison is made between the low-frequency sound pressure level of the "low-frequency sound pressure level enhancement speaker 10" described in this embodiment and the low-frequency sound pressure level of the "bass-reflex speaker" in the related art.

[0082] Bass-reflex speaker (bass-reflex speaker: bass reflex tube 41 + bass reflex port 42): 6-inch full-range speaker, internal dimensions 550mm (height) x 150mm (width) x 140mm (depth), cabinet thickness 15mm, bass reflex port 42 50mm (length) x 30mm (area 1500mm²). 2 The bass reflex tube 41 is 55mm long and uses a design with two 6.5-inch woofers 2 and one 1-inch tweeter 3. The effective vibrating area of ​​the woofers 2 is 2*13273mm². 2 The effective vibrating area ratio of the bass reflex port 42 to the woofer 2 is 1500 mm². 2 / (2*13273mm 2 =5.6%.

[0083] The sound pressure level (SPL) of the low-frequency sound pressure level enhancement speaker 10 and the bass-reflex speaker are as follows: Figure 6 As shown in the figure, the thin solid line represents the sound pressure level (SPL) curve of a "bass-reflex speaker" in related technologies, while the thick solid line represents the SPL curve of the "low-frequency SPL-enhancing speaker 10" in this embodiment. It can be seen from the figure that in the 100-200Hz frequency range on the horizontal axis, the SPL of the low-frequency SPL-enhancing speaker 10 is 1-6 dB higher than that of the bass-reflex speaker. Understandably, the 100-200Hz frequency range belongs to the low-frequency range.

[0084] That is, with other factors of the speaker set the same, setting a sound wave radiation window 122 on the speaker cabinet 1 is more effective in improving the low frequency sound pressure level than setting a bass reflex tube 41 and a bass reflex port 42 on the speaker cabinet 1, and can also reduce the impact of wind noise, resulting in better sound quality.

[0085] In this embodiment, the low-frequency sound pressure level enhancement speaker 10 achieves the enhancement of low-frequency sound pressure level only by setting the sound wave radiation window 122. That is, the speaker plays the role of enhancing low-frequency sound pressure level, with good low-frequency sound pressure level enhancement effect and good sound quality; and it has the characteristics of low cost, easy production and convenient debugging.

[0086] The present invention also provides a speaker enclosure 1, such as Figure 7As shown, the speaker enclosure 1 can be implemented using the speaker enclosure 1 in the above embodiment. Specifically, the speaker enclosure 1 is provided with a cavity 11 and a bass sound output 12. The bass sound output 12 consists of a mounting port 121 for mounting the bass speaker 2 and a sound wave radiation window 122. The mounting port 121 and the sound wave radiation window 122 are respectively connected to the cavity 11 and the outside, and the mounting port 121 and the sound wave radiation window 122 are completely separated on the speaker enclosure 1. The sound wave radiation window 122 is used to radiate the low-frequency reverse wave generated by the bass speaker 2 when it vibrates into the cavity 11 to the outside air.

[0087] The cavity 11, mounting port 121, and sound wave radiation window 122 can be configured in the same way as those in the speaker enclosure 1 in the above embodiment. The speaker enclosure 1 may also include mounting holes 16 for mounting the midrange speaker and tweeter 3. The mounting holes 16 connect the cavity 11 to the outside, and are completely separated from the mounting port 121 and sound wave radiation window 122 on the wall of the speaker enclosure 1.

[0088] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A low frequency sound pressure level enhanced soundbar, characterized in that, For enhancing low-frequency sound pressure levels, the low-frequency sound pressure level enhancement speaker (10) includes: The speaker enclosure (1) is provided with a cavity (11) and a bass sound outlet (12). The bass sound outlet (12) consists of a mounting port (121) for mounting a bass speaker (2), a mounting hole (16) for mounting a tweeter (3), and a sound wave radiation window (122) for low-frequency reverse waves to radiate from inside the cavity (11) to the outside. The mounting hole (16) is located at the upper part of the speaker enclosure (1), and the mounting port (121) is located at the lower part of the speaker enclosure (1). The mounting port (121), the mounting hole (16), and the sound wave radiation window (122) are respectively connected to the cavity (11) and the outside. The mounting port (121), the mounting hole (16), and the sound wave radiation window (122) are completely separated on the speaker enclosure (1). The tweeter (3) is mounted on the upper part of the speaker enclosure (1) through the mounting hole (16), and The bass speaker (2) is sealed and installed in the lower part of the speaker enclosure (1) through the mounting port (121), and generates a low-frequency reverse wave that radiates into the cavity (11) when vibrating. The low-frequency reverse wave in the cavity (11) is radiated into the outside air through the sound wave radiation window (122). The total area of ​​the acoustic radiation window (122) is between 1% and 20% of the effective vibration area of ​​the bass speaker (2). There are two or more acoustic radiation windows (122). Some of the acoustic radiation windows (122) are located between the mounting hole (16) and the mounting port (121), and some of the acoustic radiation windows (122) are located below the acoustic radiation window (122). The total area of ​​the acoustic radiation windows (122) located between the mounting hole (16) and the acoustic radiation window (122) is greater than the total area of ​​the acoustic radiation windows (122) located below the acoustic radiation window (122).

2. The low frequency sound pressure level enhanced soundbar of claim 1, wherein, The speaker enclosure (1) includes a top wall (13), a bottom wall (14), and a side wall (15) connecting the top wall (13) and the bottom wall (14), and the top wall (13), the bottom wall (14), and the side wall (15) together define the cavity (11); the sound wave radiation window (122) is disposed on at least one of the top wall (13), the bottom wall (14), and the side wall (15).

3. The low frequency sound pressure level enhanced soundbar of claim 2, wherein, The sidewall (15) includes at least one surface, and the acoustic radiation window (122) and the mounting port (121) are located on the same surface of the sidewall (15).

4. The low-frequency sound pressure level enhancement speaker according to claim 1, characterized in that, The acoustic radiation window (122) is symmetrically arranged about the longitudinal central axis of the mounting port (121).

5. The low-frequency sound pressure level enhancement speaker according to claim 1, characterized in that, The acoustic radiation window (122) is in the shape of a straight hole.

6. The low-frequency sound pressure level enhancement speaker according to claim 5, characterized in that, The surface on the speaker enclosure (1) on which the sound wave radiation window (122) is provided is planar. The sound wave radiation window (122) has an inner side surface (1221) on the thickness of the speaker enclosure (1), and the inner side surface (1221) is perpendicular to the corresponding surface of the speaker enclosure (1).

7. The low-frequency sound pressure level enhancement speaker according to claim 1, characterized in that, The cross-section of the acoustic radiation window (122) is circular, square, or rectangular.

8. A speaker enclosure, characterized in that, The speaker enclosure (1) is provided with a cavity (11) and a bass sound outlet (12). The bass sound outlet (12) consists of a mounting port (121) for mounting a bass speaker (2), a mounting hole (16) for mounting a tweeter (3), and a sound wave radiation window (122). The mounting hole (16) is located on the upper part of the speaker enclosure (1), and the mounting port (121) is located on the lower part of the speaker enclosure (1). The mounting port (121), the mounting hole (16), and the acoustic radiation window (122) are respectively connected to the cavity (11) and the outside, and the mounting port (121), the mounting hole (16), and the acoustic radiation window (122) are completely separated on the speaker enclosure (1). The acoustic radiation window (122) is used to radiate the low-frequency reverse wave generated by the bass speaker (2) when it vibrates into the cavity (11) into the outside air. The total area of ​​the acoustic radiation window (122) is between 1% and 20% of the effective vibration area of ​​the bass speaker (2). There are two or more acoustic radiation windows (122). Some of the acoustic radiation windows (122) are located between the mounting hole (16) and the mounting port (121), and some of the acoustic radiation windows (122) are located below the acoustic radiation window (122). The total area of ​​the acoustic radiation windows (122) located between the mounting hole (16) and the acoustic radiation window (122) is greater than the total area of ​​the acoustic radiation windows (122) located below the acoustic radiation window (122).

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