Sound production device and sound box

Abstract

The application provides a sound production device and a sound box. The sound production device comprises a first resonance component, a first resonance component comprising a first loudspeaker and a first sound tube, the first sound tube being arranged on the sound output side of the first loudspeaker; and a second resonance component, the second resonance component comprising a second loudspeaker and a second sound tube, the second sound tube being arranged on the sound output side of the second loudspeaker. The sound production device can cover a wider frequency band.

Description

Technical Field

[0001] This utility model relates to the field of audio equipment technology, and in particular to a sound-generating device and a speaker. Background Technology

[0002] In the existing technology field, bass reflex enclosures and passive radiator (PR) enclosures are common technical solutions for achieving bass extension functions. However, they rely on high-performance speakers and large-volume enclosures, which leads to problems such as large space occupation and high cost.

[0003] Traditional closed-tube resonance schemes are also a common method for achieving bass extension in existing technologies. This scheme is based on specific physical principles, enhancing bass effects through the resonance of an air column within a closed tube. However, this scheme has a drawback—a narrow bandwidth. A narrow bandwidth means that it can only effectively process and enhance a limited range of bass frequencies, failing to cover a wider audio frequency spectrum. This not only significantly limits its performance in bass extension applications, greatly reducing the richness and layering of the sound, but also severely restricts its applicability, making it difficult to meet the practical needs of applications with high bass quality requirements and diverse application scenarios. Utility Model Content

[0004] This application provides a sound-generating device and a speaker, the sound-generating device being able to cover a wide frequency band.

[0005] This application provides a sound-generating device, including: The first resonant assembly includes a first loudspeaker and a first sound tube, wherein the first sound tube is disposed on the sound output side of the first loudspeaker; The second resonant component is connected to the first resonant component. The second resonant component includes a second loudspeaker and a second sound tube, with the second sound tube disposed on the sound output side of the second loudspeaker.

[0006] In some embodiments, the first sound tube has a first sound inlet and a first sound outlet, wherein the cross-sectional area of ​​the first sound inlet is less than or equal to the cross-sectional area of ​​the first sound outlet.

[0007] In some embodiments, the second sound tube has a second inlet and a second outlet, wherein the cross-sectional area of ​​the second inlet is smaller than the cross-sectional area of ​​the second outlet.

[0008] In some embodiments, the length of the first sound tube is less than or equal to the length of the second sound tube; and / or, the cross-sectional area of ​​the first sound inlet is less than or equal to the cross-sectional area of ​​the second sound inlet; and / or, the cross-sectional area of ​​the first sound outlet is greater than or equal to the cross-sectional area of ​​the second sound outlet.

[0009] In some embodiments, the cross-sectional area of ​​the second sound tube gradually increases in the direction from the first sound inlet to the first sound outlet.

[0010] In some embodiments, the first sound outlet and the second sound outlet face opposite directions.

[0011] In some embodiments, the orientation of the sound-emitting side of the first speaker is opposite to the orientation of the sound-emitting side of the second speaker.

[0012] In some embodiments, the first speaker and the second speaker are arranged in an axially symmetrical or centrally symmetrical manner.

[0013] In some embodiments, the first resonant assembly further includes a first rear cavity connected to the first sound tube, and the first loudspeaker is disposed in the first rear cavity; the second resonant assembly further includes a second rear cavity connected to the second sound tube, and the second loudspeaker is disposed in the second rear cavity; the first rear cavity is connected to the second rear cavity.

[0014] In some embodiments, the first rear cavity includes a first bottom wall and a first side wall, the first bottom wall and the first side wall are connected and form a first opening, the first speaker is snapped into the first opening, and the rear side of the first speaker faces the first bottom wall; the second rear cavity includes a second bottom wall and a second side wall, the second bottom wall and the second side wall are connected and form a second opening, the second speaker is snapped into the second opening, and the rear side of the second speaker faces the second bottom wall.

[0015] In some embodiments, the first bottom wall is connected to the second bottom wall, and the first speaker and the second speaker are disposed opposite to each other.

[0016] In some embodiments, the first sidewall is connected to the second sidewall, and the first speaker and the second speaker are staggered.

[0017] In some embodiments, the first resonant assembly further includes a third front cavity having a third bottom wall and a third side wall, the first sound tube being connected to the third side wall and communicating with the third front cavity, and the first loudspeaker being connected to the third side wall; the second resonant assembly further includes a fourth front cavity having a fourth bottom wall and a fourth side wall, the second sound tube being connected to the fourth side wall and communicating with the fourth front cavity, the second loudspeaker being connected to the fourth side wall; the third bottom wall is connected to the fourth bottom wall.

[0018] In some embodiments, the first resonant assembly further includes a third loudspeaker connected to the third sidewall; the third loudspeaker is arranged opposite to or interleaved with the first loudspeaker in an extension direction perpendicular to the central axis of the first sound tube.

[0019] In some embodiments, the second resonant assembly further includes a fourth speaker connected to the second sidewall; the fourth speaker is arranged opposite to or staggered with the second speaker in an extension direction perpendicular to the central axis of the second sound tube.

[0020] This application embodiment also provides a speaker, including: case; A sound-generating device, wherein the sound-generating device is the aforementioned sound-generating device, and the sound-generating device is disposed within the housing.

[0021] The sound-generating device and speaker provided in this application no longer achieve resonance in a narrow frequency band like a traditional single resonant structure. Instead, it can expand different frequency ranges through the first and second sound tubes respectively, effectively covering a wider frequency band to provide richer, fuller, and more layered sound output, thereby meeting diverse sound processing needs and usage requirements in different scenarios. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a first structure of the sound-generating device provided in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of a first structure of the first resonant component provided in an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of a second structure of the first resonant component provided in an embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the structure of the second resonant component provided in an embodiment of this application.

[0027] Figure 5 This is a schematic diagram of a third structure of the first resonant component provided in an embodiment of this application.

[0028] Figure 6This is a schematic diagram of a second structure of the sound-generating device provided in an embodiment of this application.

[0029] Figure 7 This is a schematic diagram of a fourth structure of the first resonant component provided in an embodiment of this application.

[0030] Figure 8 This is a schematic diagram of a third structure of the sound-generating device provided in the embodiments of this application.

[0031] Figure 9 A comparison diagram of the first frequency response curve provided for the embodiments of this application.

[0032] Figure 10 A comparison diagram of the second frequency response curve provided for the embodiments of this application.

[0033] Figure 11 This is a schematic diagram of a fourth structure of the sound-generating device provided in the embodiments of this application.

[0034] Figure 12 This is a fifth structural schematic diagram of the sound-generating device provided in the embodiments of this application.

[0035] Figure 13 This is a sixth structural schematic diagram of the sound-generating device provided in the embodiments of this application.

[0036] Figure 14 A comparison diagram of the third frequency response curve provided in the embodiments of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] This application provides a sound-generating device and a speaker, which can cover a wide frequency band. The following is a detailed description with reference to the accompanying drawings.

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of a first structure of the sound-generating device provided in an embodiment of this application.

[0040] This application provides a sound-generating device 100, which is a device that uses the principle of resonance and, through specific structural design and the coordinated operation of components, adjusts and expands the frequency characteristics of sound, aiming to provide better sound output effects and meet the needs of sound processing in different scenarios.

[0041] The sound-generating device 100 includes a first resonant component 10 and a second resonant component 20, which are connected together. The first resonant component 10 and the second resonant component 20 are each part of the sound-generating device 100 and perform the function of extending different frequency bands in the sound-generating device 100.

[0042] The first resonant assembly 10 includes a first loudspeaker 11 and a first sound tube 12, wherein the first sound tube 12 is disposed on the sound output side of the first loudspeaker 11.

[0043] The first loudspeaker 11, as the source of sound generation, also known as a horn or electroacoustic transducer, is a transducer that converts electrical signals into sound signals. In electronic audio systems, loudspeakers convert audio electrical signals into corresponding sound signals and are the most basic component of a speaker system. In the first resonant assembly 10, the sound-emitting side of the first loudspeaker 11 can face into the first sound tube 12. This design allows the sound signal generated by the first loudspeaker 11 to directly and effectively enter the first sound tube 12 for propagation and further processing. The first sound tube 12 is a key component in the first resonant assembly 10 for further adjustment of the sound wave propagation path and characteristics. When sound waves propagate within the first sound tube 12, reflection and interference occur, which affect the frequency components and intensity of the sound, thereby achieving initial adjustment of the sound.

[0044] The second resonant assembly 20 includes a second sound tube 22 and a second loudspeaker 21. The second sound tube 22 is disposed on the sound-emitting side of the second loudspeaker 21. The second loudspeaker 21 also serves as a sound source, and its working principle and function are the same as those of the first loudspeaker 11. Its sound-emitting side can face into the second sound tube 22, converting audio electrical signals into sound signals and driving sound waves to propagate within the second sound tube 22. Similar to the first sound tube 12, the shape and size design of the second sound tube 22 have a significant impact on sound wave propagation. The first loudspeaker 11 and the second loudspeaker 21 can be identical.

[0045] The first sound tube 12 and the second sound tube 22 have different equivalent resonant tube lengths. The equivalent resonant tube length is used to quantify the resonance effect produced when sound waves propagate in a sound tube. Essentially, it simplifies the calculation and analysis of resonant frequencies by using a theoretical model to represent the complex structure of an actual sound tube (such as bends or diameter variations) as the length of an ideal, uniform straight tube. This concept is based on the fundamental principle of sound wave propagation: when the length of the sound tube meets a specific wavelength condition, sound waves form standing waves inside the tube, triggering resonance. For example, whether the first sound tube 12 or the second sound tube 22 is a straight tube, a bend, or a diameter variation will change the sound wave propagation path. For instance, the equivalent resonant tube length of a bend is usually greater than its actual physical length due to the extended path; the equivalent resonant tube length of a diameter variation tube can be determined by integrating the acoustic impedance of different cross-sections.

[0046] As mentioned above, the first sound tube 12 and the second sound tube 22 have different equivalent resonant tube lengths, allowing them to cover different low-frequency bands (such as 40Hz-80Hz and 20Hz-50Hz respectively). Through synergistic effect, the overall bandwidth of the sound-generating device 100 is extended by 40% to 60%, solving the problem of narrow bandwidth in traditional closed-tube resonant systems.

[0047] For example, in a television sound system, due to the limited internal space of the television, the traditional sound-generating device 100 is unable to achieve the ideal low-frequency effect. However, the sound-generating device 100 of this application, by rationally designing the equivalent resonant tube lengths of the first sound tube 12 and the second sound tube 22, can achieve efficient low-frequency extension within a limited space, thereby improving the sound quality of the television sound system.

[0048] The comparison of the equivalent resonant tube lengths of the first sound tube 12 and the second sound tube 22 varies under different circumstances and can be set as needed. This application uses the example where the equivalent resonant tube length of the first sound tube 12 is less than that of the second sound tube 22 for illustration. For example, the first equivalent resonant tube length is 0.6m and the second equivalent resonant tube length is 1.2m, such that the first resonant component 10 covers the mid-low frequency range, such as 50Hz to 100Hz, and the second resonant component 20 covers the ultra-low frequency range, such as 20Hz to 50Hz.

[0049] Please see Figure 2 , Figure 2 This is a schematic diagram of a first structure of the first resonant component provided in an embodiment of this application.

[0050] The first sound tube 12 has a first sound inlet 122 and a first sound outlet 121. Along the extension direction of the first sound tube 12, that is, the direction of sound wave propagation in the tube, the sound wave passes through the first sound inlet 122 and the first sound outlet 121 in sequence. The cross-sectional area of ​​the first sound inlet 122 is A1, and the cross-sectional area of ​​the first sound outlet 121 is A2. The cross-sectional area A1 of the first sound inlet 122 is less than or equal to the cross-sectional area A2 of the first sound outlet 121.

[0051] Please see Figure 3 , Figure 3 This is a schematic diagram of a second structure of the first resonant component provided in an embodiment of this application.

[0052] When the cross-sectional area A1 of the first sound inlet 122 is equal to the cross-sectional area A2 of the first sound outlet 121, the first sound tube 12 is a straight tube with a uniform cross-section, meaning its overall cross-sectional area remains consistent. Under this structure, the equivalent resonant tube length of the first sound tube 12 can be considered as its actual physical tube length.

[0053] In some embodiments, the cross-sectional area A1 of the first sound inlet 122 is smaller than the cross-sectional area A2 of the first sound outlet 121, then the first sound tube 12 is a variable diameter tube structure. In the direction from the first sound inlet 122 to the first sound outlet 121, the cross-sectional area of ​​the first sound tube 12 may gradually increase. The equivalent resonant tube length of the first sound tube 12 is determined by both the physical length and the cross-sectional ratio, and the equivalent resonant tube length of the first sound tube 12 satisfies equation (1): (1) in, The equivalent resonant tube length of the first sound tube 12, A1 is the actual length of the first sound tube 12. A2 is the cross-sectional area of ​​the first sound inlet 122 and A2 is the cross-sectional area of ​​the first sound outlet 121.

[0054] There is a certain relationship between the fundamental frequency and the path length of the sound wave, that is, the fundamental frequency satisfies equation (2): (2) in, The speed at which sound waves propagate in a medium (usually taken as 343 m / s). It is the equivalent resonant tube length of the first sound tube 12.

[0055] The fundamental frequency represents the basic vibration frequency of a sound and determines the pitch: a lower fundamental frequency results in a lower pitch, and a higher fundamental frequency results in a higher pitch.

[0056] Substituting equation (2) into equation (1) yields equation (3): (3) Combining equations (1), (2) and (3), it can be seen that when the cross-sectional area of ​​the first inlet 122 remains unchanged, the first outlet has a different cross-sectional area, and the first resonant component 10 has a different fundamental frequency accordingly.

[0057] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of the second resonant component provided in an embodiment of this application.

[0058] Similar to the first sound tube 12, the second sound tube 22 has a second sound inlet 222 and a second sound outlet 221. That is, in the direction of sound wave propagation within the tube, the sound wave passes sequentially through the second sound inlet 222 and the second sound outlet 221. Along the extension direction of the second sound tube 22, the cross-sectional area of ​​the second sound inlet 222 is A3, and the cross-sectional area of ​​the second sound outlet 221 is A4. The cross-sectional area A3 of the second sound inlet 222 is smaller than the cross-sectional area A4 of the second sound outlet 221.

[0059] In the direction from the second sound inlet 222 toward the second sound outlet 221, the cross-sectional area of ​​the second sound tube 22 gradually increases. Similar to the first sound tube 12, the propagation of sound waves within the second sound tube 22 can be further optimized, enhancing the radiation effect of low-frequency sounds.

[0060] The parameters of the first sound tube 12 and the second sound tube 22 can be adjusted in coordination according to actual acoustic needs to achieve low-frequency coverage and spatial layout optimization in different frequency bands.

[0061] The length of the first sound tube 12 is less than or equal to the length of the second sound tube 22; and / or, the cross-sectional area of ​​the first sound inlet 122 is less than or equal to the cross-sectional area of ​​the second sound inlet 222; and / or, the cross-sectional area of ​​the first sound outlet 121 is greater than or equal to the cross-sectional area of ​​the second sound outlet 221.

[0062] For example, the actual length of the first sound tube 12 is less than or equal to the actual length of the second sound tube 22.

[0063] For example, under the condition that the cross-sectional areas of the initial ends of the two tubes (i.e., the cross-sectional area A1 of the first sound inlet 122 and the cross-sectional area A3 of the second sound inlet 222) are the same, the cross-sectional areas of the first sound outlet 121 and the second sound outlet 221 can be differentiated, for example, the cross-sectional area A2 of the first sound outlet 121 is greater than the cross-sectional area A4 of the second sound outlet 221.

[0064] For example, if the cross-sectional area A2 of the first sound outlet 121 and the cross-sectional area A4 of the second sound outlet 221 are the same, by differentiating the cross-sectional areas A1 of the first sound inlet 122 and A3 of the second sound inlet 222 (e.g., the cross-sectional area A1 of the first sound inlet 122 is smaller than the cross-sectional area A3 of the second sound inlet 222), the two sound tubes can operate in different frequency bands. With this collaborative design, the overall bandwidth of the sound-generating device 100 can be extended by 40% to 60%, thereby effectively improving the narrow bandwidth limitation of traditional closed-tube resonant systems.

[0065] For example, the cross-sectional area of ​​the first sound outlet 121 is larger than that of the second sound outlet 221, so that the fundamental frequency of the first sound tube 12 is higher than that of the second sound tube 22, thereby achieving complementarity and extension of the first resonant component 10 and the second resonant component 20 in different low-frequency bands. For example, the first resonant component 10 and the second resonant component 20 are located in different frequency bands, such as 50Hz to 80Hz and 30Hz to 60Hz, to synergistically cover a wider frequency band without increasing the physical volume.

[0066] Furthermore, the change in the cross-sectional area of ​​the first sound tube 12 also significantly affects the sound pressure level, i.e., loudness. The increase in sound pressure level caused by the change in the cross-sectional area of ​​the first sound tube 12 can be derived by the following equations (4) to (8): (4) in, For radiation impedance, For radiation resistance, For radiation resistance, Let A be the wave number and A be the cross-sectional area.

[0067] (5) Where U represents volume degree. Let A be the speed of sound in the medium (approximately 343 m / s), and let A be the cross-sectional area.

[0068] (6) SPL stands for Sound Pressure Level, which is a physical quantity that measures the intensity of sound, and its unit is decibel (dB).

[0069] In the low-frequency range, since k is extremely small, the radiation resistance is extremely small, and the main function is radiation impedance. SPL (Sound Pressure Level) can be equivalent to the following equation (7): (7) The increase in loudness resulting from the change in cross-sectional area is equivalent to the following equation (8): (8) Wherein, A1 is the cross-sectional area of ​​the first sound inlet 122, and A2 is the cross-sectional area of ​​the first sound outlet 121.

[0070] It can be seen that since the cross-sectional area A2 of the first sound outlet 121 is greater than the cross-sectional area A1 of the first sound inlet 122, the gradually changing cross-sectional area design of the first sound tube 12 can effectively improve the sound pressure level, that is, enhance the loudness.

[0071] In the extending direction of the first sound tube 12, when the cross-sectional area A2 of the first sound outlet 121 is greater than the cross-sectional area A1 of the first sound inlet 122, the cross-sectional area of ​​the first sound tube 12 gradually increases.

[0072] This application's embodiments achieve a smooth impedance transition during sound wave propagation through a design that varies the cross-sectional area, reducing sound energy reflection and loss caused by abrupt changes in cross-section. This improves sound wave transmission efficiency, lowers the system's Q value, and enhances sound quality. The Q value is a frequency selectivity parameter of an acoustic system; lowering the Q value helps broaden the frequency response and reduce resonance distortion.

[0073] Combined with the second resonant component 20, for example, under the condition that the actual tube lengths of the first sound tube 12 and the second sound tube 22 are similar, and the cross-sectional areas of the initial ends of the two tubes (i.e., the cross-sectional area A1 of the first sound inlet 122 and the cross-sectional area A3 of the second sound inlet 222) are the same, by differentiating the cross-sectional areas of the first sound outlet 121 and the second sound outlet 221 (i.e., making A1≠A4), not only can the fundamental frequencies of the two sound tubes be adjusted to achieve frequency band complementarity, but the two sound tubes can also have different loudness characteristics.

[0074] For example, the cross-sectional area of ​​the first sound outlet 121 is larger than that of the second sound outlet 221, so that the loudness of the first sound tube 12 is higher than that of the second sound tube 22, thereby expanding the low-frequency range while optimizing the dynamic sound pressure distribution and enhancing the overall sound effect.

[0075] In summary, the variable cross-section design of the first sound tube 12 achieves frequency adjustment and frequency band expansion through formulas (1) and (3), loudness enhancement through formula (8), and sound quality optimization through smooth impedance transition.

[0076] As the cross-sectional area of ​​the first sound tube 12 gradually changes, the curvature of the tube wall of the first sound tube 12 satisfies equation (9): (9) Among them, A (x) Let A1 be the cross-sectional area at a distance x from the end of the first sound tube 12 closest to the first loudspeaker 11, and let A2 be the cross-sectional area of ​​the first sound inlet 122. Let k0 be the total length of the first sound tube 12, and k0 be a coefficient that satisfies 0.5≤k0≤2.0. For example, k0 can be 0.5, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.5, 1.7, 1.8 or 2.0.

[0077] The total length of the first sound tube 12 is 0.8m to 2m, which can form a good matching relationship with the sound wavelengths in the common audio range.

[0078] The ratio of the cross-sectional area A1 of the first sound inlet 122 to the cross-sectional area A2 of the first sound outlet 121 is between 1:1.2 and 1:5. When the ratio is as described above, the impedance change of sound propagation within the first sound tube 12 is relatively gradual. If the ratio is too small, i.e., the difference in cross-sectional areas at both ends of the first sound tube 12 is too large, the sound will encounter a large impedance change when moving from the area with the smaller cross-sectional area to the area with the larger cross-sectional area, resulting in strong reflection and scattering of the sound, leading to significant sound energy loss and decreased propagation stability. When the ratio is within the above-mentioned reasonable range, the sound can pass through the first sound tube 12 more smoothly, reducing reflection and interference phenomena, thereby improving the stability of sound propagation.

[0079] It is worth noting that, in this technical solution, the feature of the gradually increasing cross-sectional area of ​​the first sound tube 12 can be reflected in some sections of the first sound tube 12, or it can be extended to all sections of the first sound tube 12.

[0080] When the gradual change in cross-sectional area of ​​the first sound tube 12 exists only in certain sections (e.g., the initial section near the first loudspeaker 11 or the final section of the first loudspeaker 11), its design aims to specifically optimize sound wave propagation within a specific frequency range. For example, using a gradual structure in the initial section can effectively reduce the fundamental frequency, while using a gradual structure in the final section can further smooth the amplitude-frequency response in the ultra-low frequency band and suppress high-frequency harmonic distortion.

[0081] When the cross-sectional area of ​​the first sound tube 12 gradually changes throughout its length (i.e., it changes continuously from one end near the first loudspeaker 11 to the other), its design can achieve a more comprehensive improvement in acoustic performance.

[0082] Please see Figure 5 , Figure 5 This is a schematic diagram of a third structure of the first resonant component provided in an embodiment of this application. The extension direction W of the first sound tube 12 is curved. The curved first sound tube 12 can increase the propagation path length of sound waves within it. The curved first sound tube 12 design can achieve a longer sound wave propagation path within a limited space. Compared with the straight first sound tube 12, the curved first sound tube 12 can improve acoustic performance without increasing the overall volume of the first resonant component 10 through reasonable design and layout.

[0083] Please see Figure 6 , Figure 6This is a schematic diagram of a second structure of the sound-generating device provided in an embodiment of this application. The first sound outlet 121 and the second sound outlet 221 face opposite directions; for example, the extension direction W of the first sound tube 12 is opposite to the extension direction N of the second sound tube 22, such as being arranged in opposite directions. This design of opposite extension directions can reduce the mutual interference between the first resonant component 10 and the second resonant component 20, improving the overall performance of the sound-generating device 100. For example, when the sound-generating device 100 is working, the sound waves generated by the two resonant components will not cancel each other out or interfere with each other, thereby ensuring the clarity and layering of the sound. In addition, this extension method can also effectively utilize space.

[0084] In some cases, the first sound tube 12 and the second sound tube 22 can have the same structure and be arranged in a mirror symmetric or rotationally symmetric manner. This allows for the use of a universal sound tube mold to reduce production costs, and the symmetrical structure ensures that the frequency response characteristics of the two resonant components are matched (tolerance ≤ ±1dB), simplifying crossover tuning. Furthermore, when driven symmetrically, the two sound tubes extending in opposite directions form a dipole sound source, enhancing lateral sound diffusion and optimizing the coverage of the listening area (the horizontal diffusion angle is increased to 120°).

[0085] The cross-section of the first sound tube 12 or the second sound tube 22 is circular, elliptical, racetrack-shaped, trapezoidal, or rectangular. A circular cross-section of the first sound tube 12 or the second sound tube 22 has good symmetry, resulting in relatively uniform reflection and scattering of sound waves in all directions when propagating within it. The fabrication processes for elliptical, racetrack-shaped, trapezoidal, and rectangular cross-sections are simpler. Furthermore, with increasing demands for miniaturization of the sound-generating device 100, the elliptical, racetrack-shaped, trapezoidal, and rectangular cross-sections of the first sound tube 12 or the second sound tube 22 can achieve more efficient sound wave transmission within a limited space through reasonable layout and design.

[0086] Please continue reading. Figure 2 The first resonant component 10 also includes a first front cavity 14, which is disposed on the sound output side of the first speaker 11. It plays a preliminary guiding and focusing role on the sound waves emitted by the first speaker 11, and can affect the initial propagation characteristics of the sound waves, laying the foundation for the subsequent propagation and adjustment of the sound waves in the first sound tube 12.

[0087] The first sound tube 12 is connected to the side of the first front cavity 14 away from the first speaker 11. The first sound tube 12 is connected to the first front cavity 14, so that the sound waves can smoothly enter the first sound tube 12 from the first front cavity 14, thus realizing the continuation of the sound wave propagation path.

[0088] The cross-sectional area of ​​the first front cavity 14 can be larger than the cross-sectional area of ​​the first sound inlet 122 of the first sound tube 12, so that a throat is formed at the connection between the first front cavity 14 and the first sound tube 12. From the perspective of acoustic principles, the formation of the throat has a regulating effect on the propagation of sound waves, such as increasing the sound pressure level and significantly improving the quality of sound.

[0089] In other cases, please refer to Figure 7 , Figure 7 This is a fourth structural schematic diagram of the first resonant component provided in the embodiments of this application. The cross-sectional area of ​​the first front cavity 14 is the same as the cross-sectional area of ​​the first sound inlet 122 of the first sound tube 12. When the cross-sectional areas of the two are the same, the sound wave will not undergo significant compression or expansion during the process of entering the first sound tube 12 from the first front cavity 14, and the propagation of the sound wave will be more stable, reducing the reflection and interference losses caused by the change of cross-sectional area.

[0090] Therefore, the volume of the first front cavity 14 can be set according to the correction or refinement of the sound waves, and there is no limitation here.

[0091] Please continue reading for more details. Figure 2 as well as Figure 7 The first front cavity 14 and the first sound tube 12 are integrally formed, avoiding problems such as loosening and falling off that may occur due to the connection of components in the traditional split structure.

[0092] Similarly, please continue reading Figure 5 The second resonant assembly 20 also includes a second front cavity 24, which is disposed on the sound output side of the second speaker 21. It plays a preliminary guiding and focusing role on the sound waves emitted by the second speaker 21, and can affect the initial propagation characteristics of the sound waves, laying the foundation for the subsequent propagation and adjustment of the sound waves in the second sound tube 22.

[0093] The second sound tube 22 is connected to the side of the second front cavity 24 away from the second speaker 21. The second sound tube 22 is in communication with the second front cavity 24, allowing sound waves to smoothly enter the second sound tube 22 from the second front cavity 24, thus continuing the sound wave propagation path. The structure, connection method, and effect of the second front cavity 24 are similar to those of the first front cavity 14, and will not be described in detail here.

[0094] Furthermore, the sound-generating device 100 provided in this application effectively suppresses mechanical vibration noise (vibration sound) by optimizing the spatial arrangement of the first speaker 11 and the second speaker 21, which will be described in detail below.

[0095] It should be clarified that vibration is one of the key issues affecting sound quality. Its generation mainly stems from undesirable interactions such as interference and reflection of sound waves between speakers, leading to sound distortion and muddiness, severely impacting the listening experience. This solution addresses the fundamental factor of speaker spatial distribution, providing an effective approach to solving the vibration problem.

[0096] Please continue reading. Figure 1 The first resonant component 10 is connected to the second resonant component 20. The connected first resonant component 10 and the second resonant component 20 can form a unified acoustic system, making the propagation of sound waves between the two components smoother and more orderly. The direction of the sound output side of the first speaker 11 is opposite to the direction of the sound output side of the second speaker 21.

[0097] When the first speaker 11 and the second speaker 21 are connected to an AC signal of the same phase, their vibration displacement directions are out of phase in space because their front faces are opposite (i.e., when one vibrates forward, the other vibrates backward). The mechanical forces generated by this out-of-phase vibration can cancel each other out, significantly reducing the vibration energy transmitted to other structures of the sound-generating device 100. This not only effectively suppresses the mechanical vibration problem of the sound-generating device 100 itself, but also avoids the overall structural vibration caused by the installation of the device (such as integration into a display device), thereby preventing sound abnormalities and performance damage, improving sound purity, and extending the service life of the device and its mounted equipment.

[0098] The vibration attenuation of the first loudspeaker 11 and the second loudspeaker 21 satisfies the following equation (10): (10) Where E is the total vibration energy of the first speaker 11 and the second speaker 21, E1 is the vibration energy of the first speaker 11, and E2 is the vibration energy of the second speaker 21. It is the angle between the vibration directions of the first speaker 11 and the second speaker 21.

[0099] When the angle between the vibration directions of the first speaker 11 and the second speaker 21 is 180°, the vibration amplitude of the first sound-emitting device 100 can be reduced by 6dB to 10dB.

[0100] In addition, this design of relatively anti-phase vibration increases the equivalent radiation acoustic impedance of the loudspeaker system, which improves the sound radiation efficiency and makes the low-frequency response fuller and more powerful.

[0101] To achieve optimal vibration cancellation and acoustic performance, the first loudspeaker 11 and the second loudspeaker 21 are arranged in an axisymmetric or centrosymmetric configuration. This symmetrical structure ensures that the sound waves generated by the two loudspeakers have more consistent propagation characteristics, making their interaction more regular and controllable.

[0102] Depending on the specific spatial distribution requirements and application scenarios, the structural configuration of the first resonant component 10 and the second resonant component 20 can be implemented in the following two ways.

[0103] In some cases, please refer to Figure 2 , Figure 3 as well as Figure 8 , Figure 8 This is a schematic diagram of a third structure of the sound-generating device provided in the embodiments of this application. The first resonant component 10 also includes a first rear cavity 13, which is connected to the first sound tube 12. This connection method includes, but is not limited to, threaded connection, snap-fit ​​connection or integral molding, to ensure acoustic sealing and avoid sound leakage and excessive attenuation.

[0104] The first loudspeaker 11 is disposed within the first rear cavity 13. The first rear cavity 13 provides a sealed acoustic load for vibrations at the back of the first loudspeaker 11. When the loudspeaker vibrates, the air within the rear cavity is compressed or rarefied, resulting in corresponding changes in sound pressure. By precisely designing the volume and geometry of the rear cavity, this acoustic load can be optimized, thereby tuning the frequency response characteristics of the system.

[0105] Please continue reading. Figure 8 The second resonant assembly 20 also includes a second rear cavity 23, which is connected to the second sound tube 22 in a manner similar to the connection between the first rear cavity 13 and the first sound tube 12. The second loudspeaker 21 is disposed within the second rear cavity 23, and its operating principle is the same as that of the first rear cavity 13.

[0106] The first rear cavity 13 is connected to the second rear cavity 23. This connection can be direct or indirect, ensuring that the anti-phase vibrations of the first speaker 11 and the second speaker 21 can be effectively mechanically coupled and canceled through the cavity structure.

[0107] Please continue reading. Figure 8 The first rear cavity 13 includes a first bottom wall 131 and a first side wall 132. The first bottom wall 131 and the first side wall 132 are connected to form a first opening, such as by welding, bonding, or integral injection molding. The first speaker 11 is securely mounted at the first opening by a snap-fit ​​structure (such as a spring clip engaging with a slot), with its back facing the first bottom wall 131. This arrangement allows the speaker's back vibration to fully utilize the rear cavity space, enhancing the power and depth of the low-frequency response.

[0108] Please continue reading. Figure 8The second rear cavity 23 includes a second bottom wall 231 and a second side wall 232. The second bottom wall 231 and the second side wall 232 are connected to form a second opening. The connection method can be welding, bonding, or integral injection molding as described above. The second speaker 21 is also snapped into the second opening, with its back facing the second bottom wall 231, to achieve a low-frequency response enhancement effect similar to that of the first speaker 11.

[0109] Specifically, the direction from the first sound inlet 122 to the first sound outlet 121 is the first direction, and the direction from the second sound inlet 222 to the second sound outlet 221 is the second direction. In this case, the first direction and the second direction are not collinear, but parallel and opposite. In this case, the sound outlet side of the first speaker 11 faces the first direction, and the sound outlet side of the second speaker 21 faces the second direction.

[0110] Please continue reading. Figure 8 The first sidewall 132 is connected to the second sidewall 232. At this time, the first speaker 11 and the second speaker 21 are staggered, that is, the first speaker 11 and the second speaker 21 are spatially staggered. This layout can effectively cancel vibrations while making more compact use of space, which helps to reduce the overall size of the device.

[0111] Please see Figure 9 , Figure 9 A comparison diagram of the first type of frequency response curves provided for embodiments of this application. For Figure 8 Correspondingly, this application embodiment also provides a frequency response curve comparison diagram of the sound-generating device 100, the phase reflex resonator, and other resonance methods. The solid line represents... Figure 8 The frequency response curves of the corresponding sound-generating device 100 are shown, with dotted dashed lines representing the frequency response curve of the phase inverter resonance and horizontal dashed lines representing the frequency response curves of other resonance methods. From Figure 9 As can be seen, the sound-generating device 100 improves the bass extension frequency and loudness, while widening the effective bandwidth of the sound-generating device 100, and the total power can be reduced by 50% compared with a single resonant component.

[0112] Please see Figure 10 , Figure 10 A comparison diagram of the second type of frequency response curve provided in the embodiments of this application. The embodiments of this application also provide for... Figure 8A comparison diagram of the frequency response curves of the sound-generating device 100, the first resonant component 10, and the second resonant component 20 is provided. In the diagram, the solid line represents the frequency response curve of the corresponding sound-generating device 100, the dotted dashed line represents the frequency response curve of the first resonant component 10, and the horizontal dashed line represents the frequency response curve of the second resonant component 20. In the 20Hz to 300Hz range, the frequency response curve of the sound-generating device 100 forms the envelope of the first resonant component 10 and the second resonant component 20. This envelope means that the overall frequency response curve always covers the curves of both components, indicating that the sound-generating device 100 effectively integrates the acoustic characteristics of the first resonant component 10 and the second resonant component 20, achieving an overall improvement in sound pressure level and frequency band complementarity across a wider frequency band.

[0113] Please see Figure 11 , Figure 11 This is a schematic diagram of a fourth structure of the sound-generating device provided in the embodiments of this application. The first bottom wall 131 is connected to the second bottom wall 231. In this case, the first speaker 11 and the second speaker 21 are arranged opposite each other (i.e., back to back, with their respective backs facing the connected bottom wall), and this arrangement directly maximizes vibration cancellation.

[0114] Specifically, the direction from the first sound inlet 122 to the first sound outlet 121 is the first direction, and the direction from the second sound inlet 222 to the second sound outlet 221 is the second direction. In this case, the first direction and the second direction are collinear and opposite. In this case, the sound outlet side of the first speaker 11 faces the first direction, and the sound outlet side of the second speaker 21 faces the second direction.

[0115] Through structural design and component collaboration, a significant expansion of the frequency response range and robust loudness superposition are achieved. Specifically, the first resonant component 10 and the second resonant component 20 have different optimal resonant frequencies due to differences in the equivalent resonant tube length or cross-sectional area configuration, each covering different sub-frequency bands. When the two work together, their frequency response characteristics complement each other, generating a coupling enhancement effect in overlapping and adjacent frequency bands, thereby enabling the overall device to exhibit smooth and improved frequency response performance in a wide range of 20Hz to 300Hz.

[0116] In other cases, please refer to Figure 12 , Figure 12This is a fifth structural schematic diagram of the sound-generating device provided in the embodiments of this application. The first resonant assembly 10 further includes a third front cavity 16, which has a third bottom wall 161 and a third side wall 162. A first sound tube 12 is connected to the third side wall 162 and communicates with the third front cavity 16. A first loudspeaker 11 is connected to the third side wall 162 and faces into the third front cavity 16 along an extension direction perpendicular to the third front cavity 16. The second resonant assembly 20 further includes a fourth front cavity 26, which has a fourth bottom wall 261 and a fourth side wall 262. A second sound tube 22 is connected to the fourth side wall 262 and communicates with the fourth front cavity 26. A second loudspeaker 21 is connected to the fourth side wall 262 and faces into the fourth front cavity 26 along an extension direction perpendicular to the fourth front cavity 26. The third bottom wall 161 is connected to the fourth bottom wall 261.

[0117] At this time, the first speaker 11 and the second speaker 21 are staggered, that is, the first speaker 11 and the second speaker 21 are staggered in space. This layout can effectively counteract vibration and make reasonable use of space.

[0118] In the above configuration, the first resonant assembly 10 further includes a third rear cavity 17, which corresponds to the first speaker 11. The first speaker 11 is disposed within the third rear cavity 17 and is snapped into the opening of the third rear cavity 17, such as by means of an elastic snap-fit ​​structure. The third rear cavity 17 is rigidly connected to the third sidewall 162 (the connection method includes threaded fastening, snap-fit ​​locking, or adhesive bonding), while its internal chamber remains in communication with the internal acoustic channel of the third rear cavity 17, enabling the sound waves generated by the first speaker 11 to be efficiently coupled into the first sound tube 12 for propagation.

[0119] The second resonant assembly 20 also includes a fourth rear cavity 27, which corresponds to the second speaker 21. The second speaker 21 is disposed inside the fourth rear cavity 27. The fourth rear cavity 27 is connected to the fourth side wall 262 and communicates with the interior of the fourth rear cavity 27. The connection and acoustic coupling method are the same as those of the third rear cavity 17, and will not be described again here.

[0120] Please see Figure 13 , Figure 13 This is a sixth structural schematic diagram of the sound-generating device provided in the embodiments of this application. The first resonant assembly 10 further includes a third loudspeaker 15, which is connected to the third sidewall 162. The central axis of the first sound tube 12 extends in the direction from the first sound inlet 122 toward the first sound outlet 121. In the direction perpendicular to the central axis of the first sound tube 12, the third loudspeaker 15 and the first loudspeaker 11 are arranged opposite to or staggered, so that their vibrations cancel each other out.

[0121] In the above case, the first resonant assembly 10 also includes a fifth rear cavity 18, which corresponds to the third speaker 15. The third speaker 15 is disposed in the fifth rear cavity 18. The fifth rear cavity 18 is connected to the third side wall 162 and communicates with the interior of the fifth rear cavity 18. The connection and acoustic coupling method are the same as those of the third rear cavity 17, and will not be described again here.

[0122] The second resonant assembly 20 also includes a fourth speaker 25, which is connected to the fourth sidewall 262. The second sound tube 22 extends from the second sound inlet 222 toward the second sound outlet 221. In the extension direction perpendicular to the central axis of the second sound tube 22, the fourth speaker 25 and the second speaker 21 are arranged opposite to or staggered to achieve vibration cancellation.

[0123] In the above case, the second resonant assembly 20 also includes a sixth rear cavity 28, which corresponds to the fourth speaker 25. The fourth speaker 25 is disposed in the sixth rear cavity 28. The sixth rear cavity 28 is connected to the fourth side wall 262 and communicates with the interior of the sixth rear cavity 28. The connection and acoustic coupling method are the same as those of the third rear cavity 17, and will not be described again here.

[0124] In one feasible solution, as Figure 13 The sound-generating device 100 includes a first resonant assembly 10 and a second resonant assembly 20. The first resonant assembly 10 includes a first sound tube 12, a first loudspeaker 11, and a third loudspeaker 15, with the sound-emitting sides of the first loudspeaker 11 and the third loudspeaker 15 facing into the first sound tube 12. The second resonant assembly 20 includes a second sound tube 22, a second loudspeaker 21, and a fourth loudspeaker 25, with the sound-emitting sides of the second loudspeaker 21 and the fourth loudspeaker 25 facing into the second sound tube 22.

[0125] The first resonant assembly 10 further includes a third front cavity 16, which has a third bottom wall 161 and a third side wall 162. A first sound tube 12 is connected to the third side wall 162 and communicates with the third front cavity 16. A first loudspeaker 11 is connected to the third side wall 162 and faces into the third front cavity 16 along a direction perpendicular to the extension of the first sound tube 12. The second resonant assembly 20 further includes a fourth front cavity 26, which has a fourth bottom wall 261 and a fourth side wall 262. A second sound tube 22 is connected to the fourth side wall 262 and communicates with the fourth front cavity 26. A second loudspeaker 21 is connected to the fourth side wall 262 and faces into the fourth front cavity 26 along a direction perpendicular to the extension of the second sound tube 22. The third bottom wall 161 is connected to the fourth bottom wall 262. The third speaker 15, the first speaker 11, the second speaker 21 and the fourth speaker 25 are arranged in an alternating pattern to form a grid-shaped four-speaker array. The low-frequency enhancement and bandwidth expansion functions are achieved through frequency division coupling and vibration synergistic suppression.

[0126] When a four-speaker array is driven in parallel, the superposition of sound wave energy increases the total output sound pressure level (SPL), satisfying equation (11): (11) in, The total sound pressure level is given by denoted as N, where N is the number of loudspeakers (N is 4 here), and V0 is the volume velocity of a single loudspeaker.

[0127] According to Equation (11), the maximum sound pressure level gain is 6dB, and the measured sound pressure level is increased by 35% to 45% in the low frequency range (20–50Hz).

[0128] Similarly, the grid-shaped four-speaker array further cancels out mechanical vibrations through its phase-orthogonal layout, and its combined vibration force satisfies equation (12): (12) in, This is the composite vibration force vector, in N. The vibration force amplitudes generated by the first speaker 11, the second speaker 21, the third speaker 15, and the fourth speaker 25 are respectively, in N; It represents the complex exponential form, reflecting the phase characteristics of the vibrational force; Angular frequency, in rad / s. .in, t is the vibration frequency; t is the time variable, in seconds; π / 2, π, and 3π / 2 are the phase offsets, achieving a 90° orthogonal phase difference distribution for the four speakers.

[0129] when = = = At that time, the composite vibrational force | When |≈0, the vibration acceleration decreases by 12dB to 15dB, which can effectively eliminate vibration noise.

[0130] Please see Figure 14 , Figure 14 A comparison diagram of the third type of frequency response curve provided in the embodiments of this application. The embodiments of this application also provide for... Figure 13 A comparison chart of the frequency response curves of the sound-generating device 100, the bass reflex resonator, and other resonance methods is provided. In the chart, the solid line represents the frequency response curve of the corresponding sound-generating device 100, the dotted dashed line represents the frequency response curve of the bass reflex resonator, and the horizontal dashed line represents the frequency response curves of other resonance methods. From... Figure 14 As can be seen, the sound-generating device 100 improves the bass extension frequency and loudness, while widening the effective bandwidth of the sound-generating device 100, and the total power can be reduced by 75% compared to a single resonant component.

[0131] This application also provides a speaker that can be used in home appliances such as televisions and monitors. The speaker includes a housing and a sound-emitting device 100. The housing serves as the external structure of the speaker, protecting the internal components. The sound-emitting device 100 is disposed within the housing. The speaker provided in this application, through the coordinated operation of the housing and the sound-emitting device 100, achieves optimized sound propagation, improved frequency response, and enhanced overall performance.

[0132] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0133] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0134] The sound-generating device and speaker provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sound-generating device, characterized in that, include: The first resonant assembly includes a first loudspeaker and a first sound tube, wherein the first sound tube is disposed on the sound output side of the first loudspeaker; The second resonant component is connected to the first resonant component. The second resonant component includes a second loudspeaker and a second sound tube, with the second sound tube disposed on the sound output side of the second loudspeaker.

2. The sound-generating device according to claim 1, characterized in that, The first sound tube has a first sound inlet and a first sound outlet, and the cross-sectional area of ​​the first sound inlet is less than or equal to the cross-sectional area of ​​the first sound outlet.

3. The sound-generating device according to claim 2, characterized in that, The second sound tube has a second inlet and a second outlet, and the cross-sectional area of ​​the second inlet is smaller than the cross-sectional area of ​​the second outlet.

4. The sound-generating device according to claim 3, characterized in that, The length of the first sound tube is less than or equal to the length of the second sound tube; and / or, the cross-sectional area of ​​the first sound inlet is less than or equal to the cross-sectional area of ​​the second sound inlet; and / or, the cross-sectional area of ​​the first sound outlet is greater than or equal to the cross-sectional area of ​​the second sound outlet.

5. The sound-generating device according to claim 3, characterized in that, The cross-sectional area of ​​the second sound tube gradually increases in the direction from the first sound inlet to the first sound outlet.

6. The sound-generating device according to claim 3, characterized in that, The first sound outlet faces the opposite direction to the second sound outlet.

7. The sound-generating device according to any one of claims 1 to 5, characterized in that, The orientation of the sound-emitting side of the first speaker is opposite to that of the sound-emitting side of the second speaker.

8. The sound-generating device according to claim 7, characterized in that, The first speaker and the second speaker are arranged in an axially symmetrical or centrally symmetrical manner.

9. The sound-generating device according to claim 7, characterized in that, The first resonant assembly further includes a first rear cavity, which is connected to the first sound tube, and the first loudspeaker is disposed in the first rear cavity; the second resonant assembly further includes a second rear cavity, which is connected to the second sound tube, and the second loudspeaker is disposed in the second rear cavity; the first rear cavity is connected to the second rear cavity.

10. The sound-generating device according to claim 9, characterized in that, The first rear cavity includes a first bottom wall and a first side wall. The first bottom wall is connected to the first side wall and forms a first opening. The first speaker is snapped into the first opening, and the back side of the first speaker faces the first bottom wall. The second rear cavity includes a second bottom wall and a second side wall. The second bottom wall is connected to the second side wall and forms a second opening. The second speaker is snapped into the second opening, and the back side of the second speaker faces the second bottom wall.

11. The sound-generating device according to claim 10, characterized in that, The first bottom wall is connected to the second bottom wall, and the first speaker and the second speaker are arranged opposite to each other.

12. The sound-generating device according to claim 10, characterized in that, The first sidewall is connected to the second sidewall, and the first speaker and the second speaker are staggered.

13. The sound-generating device according to any one of claims 1 to 5, characterized in that, The first resonant assembly further includes a third front cavity, the third front cavity having a third bottom wall and a third side wall, the first sound tube being connected to the third side wall and communicating with the third front cavity, and the first loudspeaker being connected to the third side wall; the second resonant assembly further includes a fourth front cavity, the fourth front cavity having a fourth bottom wall and a fourth side wall, the second sound tube being connected to the fourth side wall and communicating with the fourth front cavity, the second loudspeaker being connected to the fourth side wall; the third bottom wall is connected to the fourth bottom wall.

14. The sound-generating device according to claim 13, characterized in that, The first resonant assembly further includes a third loudspeaker, which is connected to the third sidewall; in the extension direction perpendicular to the central axis of the first sound tube, the third loudspeaker is arranged opposite to or staggered with the first loudspeaker.

15. The sound-generating device according to claim 14, characterized in that, The second resonant assembly further includes a fourth loudspeaker connected to the fourth sidewall; the fourth loudspeaker is arranged opposite to or staggered with the second loudspeaker in an extension direction perpendicular to the central axis of the second sound tube.

16. A speaker, characterized in that, include: case; A sound-generating device, wherein the sound-generating device is the sound-generating device according to any one of claims 1 to 15, and the sound-generating device is disposed within the housing.

Images