Vehicle-mounted miniaturized directional strong sound equipment based on double-membrane transducer

Abstract

The invention discloses a vehicle-mounted miniaturized directional strong sound device based on a double-membrane transducer, and the device employs the rear-mounted direct-drive layout of the double-membrane transducer, enables sound waves to directly enter a horn structure, avoids the path loss and energy attenuation caused by the multiple reflection of the sound waves in a conventional reflective structure, and remarkably improves the electroacoustic conversion efficiency. Under the same input power, higher sound pressure level output can be realized, through the synergistic effect of the three-section horn structure with the gradually changing section and the built-in phase cone, the form and the propagation phase of a sound wave wavefront are effectively controlled, sound energy is gradually converged in the propagation process, the sound beam diffusion angle is greatly compressed, the directivity and the propagation distance of sound are enhanced, and the sound quality is improved. In addition, by means of precise integration of the acoustic cavity and vertical installation of the circuit board, high-density layout is achieved in a limited space, and the device is suitable for a vehicle-mounted environment, supports multi-device cascading and matrix deployment, is easy and convenient to install and maintain and has outstanding engineering practicability and reliability.

Description

Technical Field

[0001] This invention belongs to the field of sound enhancement technology and relates to a directional sound enhancement device, specifically a vehicle-mounted miniaturized directional sound enhancement device based on a dual-membrane transducer. Background Technology

[0002] Directional acoustic technology is a technique that uses acoustic means to achieve long-distance directional sound propagation, and it has important applications in security early warning, emergency command, public broadcasting, and vehicle communication. Existing directional acoustic devices are mainly based on the principle of electroacoustic transduction, using acoustic structures to concentrate sound wave energy in a specific direction to improve the propagation distance and directivity of the sound.

[0003] Currently, common directional high-intensity acoustic systems mainly employ single-diaphragm transducers or reflective dual-diaphragm transducers. Single-diaphragm transducers are simple in structure and low in cost, but limited by their vibrating area and driving force, they struggle to achieve high sound pressure output with limited power. Furthermore, their large beam spread angle and limited directional control make them unsuitable for the demands of long-distance, high-definition sound propagation in vehicle environments. To improve sound output, some devices use dual-diaphragm transducers, where the sound pressure is superimposed through the in-phase vibration of two diaphragms. However, their traditional arrangement is often reflective, where the transducer is placed inside the acoustic cavity, and the sound wave must be deflected by a reflective surface before entering the horn. While this structure improves sound pressure to some extent, it also introduces problems such as increased sound path length and reflection loss, leading to reduced electroacoustic conversion efficiency. Additionally, the reflective cavity occupies a significant amount of space, hindering miniaturization design. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a vehicle-mounted miniaturized directional high-intensity sound device based on a dual-membrane transducer. By adopting an acoustic structure that combines a rear-mounted direct-drive dual-membrane transducer with a three-segment horn, efficient focusing and directional enhancement of sound waves are achieved within a limited space.

[0005] The objective of this invention can be achieved through the following technical solutions: A miniaturized directional acoustic device for vehicles based on a dual-membrane transducer includes: a housing, an acoustic component, a dual-membrane transducer, and a circuit board assembly. The housing is divided into a front acoustic cavity and a rear electrical cavity by a middle partition. The acoustic component is located in the acoustic cavity, while the dual-membrane transducer and the circuit board assembly are both located in the electrical cavity. The circuit board assembly is electrically connected to the dual-membrane transducer to drive the dual-membrane transducer to generate sound waves. The acoustic component passes through the partition and communicates with the dual-membrane transducer to reduce the sound waves generated by the dual-membrane transducer to a preset sound beam angle output.

[0006] Furthermore, the high-intensity sound component adopts a three-section horn structure with gradually changing cross-section, including: horn one, horn two, and horn three. The end of horn one with a smaller cross-section is connected to the dual-membrane transducer, the end of horn two with a smaller cross-section is connected to the end of horn one with a larger cross-section, and the end of horn three with a smaller cross-section is connected to the end of horn two with a larger cross-section, so that the sound wave is input from the end of horn one with a smaller cross-section and output from the end of horn three with a larger cross-section.

[0007] Furthermore, the smaller end of the horn one has a sound inlet, and the larger end has a first opening; the smaller end of the horn two has a first reflector, and the larger end has a second opening; the smaller end of the horn three has a second reflector, and the larger end has a sound outlet; the first opening end of the horn one is inserted into the interior of the horn two through the second opening and is fitted with the first reflector with a gap; the second opening end of the horn two is inserted into the interior of the horn three through the sound outlet and is fitted with the second reflector with a gap.

[0008] Furthermore, horn one is integrally formed inside horn three, and the sound inlet of horn one is opened on the second reflector of horn three to connect horn one with the dual-diaphragm transducer.

[0009] Furthermore, the second open end of Horn Two is fixedly connected to the second reflector plate of Horn Three via a mounting post.

[0010] Furthermore, a phase cone is provided on the first reflector of Horn II to adjust the sound wave front surface so that the phases of the sound waves at the center and the edges tend to be consistent.

[0011] Furthermore, a through hole is provided in the middle of the partition plate, through which the sound-enhancing component communicates with the dual-membrane transducer. A sealing element is provided in the through hole to seal the sound-enhancing component and the dual-membrane transducer.

[0012] Furthermore, the sealing element includes: a first sealing layer, a second sealing layer, and a sealing ring. The first sealing layer is sealed between the high-intensity acoustic component and the partition plate, the second sealing layer is sealed between the dual-membrane transducer and the partition plate, and the sealing ring is disposed in the through hole. One end of the sealing ring is connected to the first sealing layer, and the other end is connected to the second sealing layer.

[0013] Furthermore, the circuit board assembly includes a power board, a logic control board, and an audio driver board, which are vertically mounted in the electrical cavity. The power board supplies power to the dual-membrane transducer, and the logic control board controls the audio driver board to drive the dual-membrane transducer to generate sound waves according to the input audio file.

[0014] Furthermore, a protective mesh is provided at the end of the acoustic cavity opposite to the partition, and a base plate is sealed at the end of the electrical cavity opposite to the partition. A waterproof aviation plug for connecting to the circuit board assembly is provided on the base plate.

[0015] The beneficial effects of this invention are as follows: The vehicle-mounted miniaturized directional high-intensity sound device provided by this invention adopts a direct-drive layout with dual-diaphragm transducers at the rear, allowing sound waves to directly enter the horn structure. This avoids path loss and energy attenuation caused by multiple reflections of sound waves in traditional reflective structures, thereby significantly improving electroacoustic conversion efficiency. Higher sound pressure level output can be achieved under the same input power. By employing a horn structure with a three-segment gradually changing cross-section and the synergistic effect of the built-in phase cone, the shape and propagation phase of the sound wavefront are effectively controlled, allowing sound energy to gradually converge during propagation, greatly compressing the sound beam diffusion angle, enhancing the directivity and propagation distance of the sound, and adapting to the needs of long-distance directional broadcasting and warning. In addition, through the precise integration of the acoustic cavity and the vertical mounting of the circuit board, a high-density layout is achieved in a limited space, making it suitable for vehicle environments. It supports multi-device cascading and matrix deployment, and is easy to install and maintain, exhibiting outstanding engineering practicality and reliability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0018] Figure 3 This is a disassembled schematic diagram of the internal structure of the acoustic cavity of the present invention.

[0019] Figure 4 This is a schematic diagram of the operation of the high-intensity sound component of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation of the protective netting of the present invention.

[0021] Figure 6 This is a three-dimensional schematic diagram of the housing of the present invention.

[0022] Figure 7 This is a side view of the sealing element of the present invention.

[0023] Figure 8 This is a disassembly diagram of the interior of the electrical cavity of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-2As shown, this invention provides a miniaturized vehicle-mounted directional acoustic device based on a dual-membrane transducer, comprising: a housing 1, an acoustic enhancement component 2, a dual-membrane transducer 3, and a circuit board assembly 4. The housing 1 is internally divided into a front acoustic cavity 12 and a rear electrical cavity 13 by a partition 11. The acoustic enhancement component 2 is disposed within the acoustic cavity 12, while the dual-membrane transducer 3 and the circuit board assembly 4 are both disposed within the electrical cavity 13. The circuit board assembly 4 is electrically connected to the dual-membrane transducer 3 to drive the dual-membrane transducer 3 to generate sound waves. The acoustic enhancement component 2 passes through the partition 11 and communicates with the dual-membrane transducer 3 to output the sound waves generated by the dual-membrane transducer 3 at a preset beam angle. By employing a rear-mounted dual-membrane transducer 3, this invention achieves a smaller beam angle and higher electroacoustic conversion efficiency compared to the traditional reflective arrangement of the dual-membrane transducer 3, even with limited space in the acoustic cavity 12.

[0026] The high-powered component 2 employs a three-section horn structure with gradually changing cross-section, and each of the three sections is made of aluminum alloy with a thickness of over 3mm to reduce the energy loss of sound waves due to mechanical vibration caused by high sound pressure levels. For example... Figure 3 As shown, the high-intensity sound component 2 includes: horn 1 21, horn 2 22, and horn 3 23. The smaller end of horn 1 21 is connected to the dual-membrane transducer 3. The smaller end of horn 2 22 is connected to the larger end of horn 1 21. The smaller end of horn 3 23 is connected to the larger end of horn 2 22, so that sound waves are input from the smaller end of horn 1 21 and output from the larger end of horn 3 23. The three horns effectively increase the control length of the sound wave and improve the control index of the sound beam angle, resulting in a smaller sound beam angle, higher concentration, and stronger directionality of the output sound wave.

[0027] Specifically, such as Figure 4 As shown, horn 1 21 has a sound inlet 211 at the smaller cross-section end and a first opening 212 at the larger cross-section end; horn 22 has a first reflector 221 at the smaller cross-section end and a second opening 222 at the larger cross-section end; horn 3 23 has a second reflector 231 at the smaller cross-section end and a sound outlet 232 at the larger cross-section end. The first opening 212 end of horn 1 21 is inserted into horn 22 22 through the second opening 222 and fits with the first reflector 221 with a clearance. The second opening 222 end of horn 22 22 is inserted into horn 3 23 3 through the sound outlet 232 and fits with the second reflector 231 with a clearance. This allows for a three-section horn structure to be set within the limited space of the sound cavity 12, minimizing the device structure and facilitating integrated matrix design for vehicle use.

[0028] During operation, the sound waves generated by the dual-membrane transducer 3 enter horn 1 21 through the inlet 211, then enter horn 22 through the first opening 212. After being reflected by the first reflector 221, they enter horn 3 23 through the second opening 222, and after being reflected by the second reflector 231, they are output from the outlet 232. During this propagation process, the wavefront is gradually compressed, and the sound energy density increases, thereby controlling the sound beam angle within a preset range of less than or equal to a certain value (generally 10°-30°), achieving directional propagation.

[0029] In this embodiment, during installation, horn 1 21 is integrally formed within horn 3 23. The sound inlet 211 of horn 1 21 is located on the second reflector 231 of horn 3 23, connecting horn 1 21 to the dual-diaphragm transducer 3. The second opening 222 of horn 22 is fixedly connected to the second reflector 231 of horn 3 23 via mounting posts 223. The first reflector 221 of horn 22 has a phase cone 224, which adjusts the phase, aligning the phase of the sound wave at the center and edge, thus optimizing the sound wave transmission path and reducing energy loss due to internal reflection of the sound wave within the horn structure.

[0030] A protective net 15 is provided at the end of the sound cavity 12 opposite to the partition 11, which has a certain protective function to prevent debris from falling into the sound cavity 12 and protect the internal structure of the sound cavity 12. Figure 5 As shown, the protective net 15 is fixedly installed at the end of the housing 1 by a cross support plate 16, which supports the protective net 15 to prevent it from deforming naturally or upon impact. Specifically, the protective net 15 and the peripheral edges of the cross support plate 16 are both fixedly installed at the end of the housing 1 by bolts.

[0031] like Figure 6 As shown, a through hole 14 is provided in the middle of the partition 11. The sound-enhancing component 2 passes through the through hole 14 and communicates with the double-diaphragm transducer 3. A sealing element 5 is provided inside the through hole 14 to seal the sound-enhancing component 2 and the double-diaphragm transducer 3, preventing sound leakage and improving the efficiency of sound propagation. Specifically, as shown... Figure 7 As shown, the sealing element 5 includes: a first sealing layer 51, a second sealing layer 52, and a sealing ring 53. The first sealing layer 51 is sealed between the high-intensity acoustic component 2 and the partition plate 11. The second sealing layer 52 is sealed between the dual-membrane transducer 3 and the partition plate 11. The sealing ring 53 is disposed in the through hole 14. One end of the sealing ring 53 is connected to the first sealing layer 51, and the other end is connected to the second sealing layer 52.

[0032] like Figure 8As shown, the circuit board assembly 4 includes a power board 41, a logic control board 42, and an audio driver board 43, all vertically mounted within the electrical cavity 13. This vertical mounting method makes full use of the limited space within the electrical cavity 13. The power board 41 has a DC 24V power input interface to power the dual-membrane transducer 3, meeting automotive application requirements. The logic control board 42 connects to the automotive multimedia system via an Ethernet interface, enabling the transmission of real-time audio and the import of audio files. It also provides logic control and signal processing functions, controlling the audio driver circuit on the audio driver board 43 to drive the dual-membrane transducer 3 to generate sound waves based on the audio file. The logic control board 42 also has a differential audio interface, used for direct series connection with other devices when multiple devices are used simultaneously, to control synchronized sound output from multiple devices. When multiple devices are used, their power supply lines are connected in parallel, while their audio lines are connected in series.

[0033] Specifically, firstly, the input audio file is subjected to logic control and digital signal processing (such as equalization, compression, and frequency division) by the logic control board 42, and a clean audio signal is output to the audio driver board 43; then, the audio signal is amplified to a voltage and current sufficient to drive the dual-membrane transducer 3 by the high-power audio driver circuit of the audio driver board 43; finally, the dual-membrane structure of the dual-membrane transducer 3 vibrates in phase under the excitation of the electrical signal, directly driving the air to generate sound waves.

[0034] The electrical cavity 13 is sealed with a base plate 17 at the end opposite to the partition 11. A waterproof aviation plug 18 connected to the circuit board assembly 4 is provided on the base plate 17 to ensure good sealing of the installation space inside the electrical cavity 13 while ensuring signal and power input.

[0035] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A vehicle-mounted miniaturized directional high-intensity sound device based on a dual-membrane transducer, characterized in that, include: The housing (1), the sound-enhancing component (2), the dual-membrane transducer (3), and the circuit board assembly (4) are divided into a sound cavity (12) and an electrical cavity (13) by a partition (11). The sound-enhancing component (2) is located in the sound cavity (12), and the dual-membrane transducer (3) and the circuit board assembly (4) are both located in the electrical cavity (13). The circuit board assembly (4) is electrically connected to the dual-membrane transducer (3) to drive the dual-membrane transducer (3) to generate sound waves. The sound-enhancing component (2) passes through the partition (11) and communicates with the dual-membrane transducer (3) to reduce the sound waves generated by the dual-membrane transducer (3) to a preset sound beam angle output.

2. The directional high-intensity sound device according to claim 1, characterized in that, The high-intensity sound component (2) adopts a three-section horn structure with gradually changing cross-section, including: horn one (21), horn two (22), and horn three (23). The end of the smaller cross-section of horn one (21) is connected to the dual-membrane transducer (3), the end of the smaller cross-section of horn two (22) is connected to the end of the larger cross-section of horn one (21), and the end of the smaller cross-section of horn three (23) is connected to the end of the larger cross-section of horn two (22), so that the sound wave is input from the end of the smaller cross-section of horn one (21) and output from the end of the larger cross-section of horn three (23).

3. The directional high-intensity sound device according to claim 2, characterized in that, Horn 1 (21) has a sound inlet (211) at the end with a smaller cross section and a first opening (212) at the end with a larger cross section. Horn 2 (22) has a first reflector (221) at the end with a smaller cross section and a second opening (222) at the end with a larger cross section. Horn 3 (23) has a second reflector (231) at the end with a smaller cross section and a sound outlet (232) at the end with a larger cross section. The first opening (212) end of Horn 1 (21) is inserted into Horn 2 (22) through the second opening (222) and is fitted with the first reflector (221) with a gap. The second opening (222) end of Horn 2 (22) is inserted into Horn 3 (23) through the sound outlet (232) and is fitted with the second reflector (231) with a gap.

4. The directional high-intensity sound device according to claim 3, characterized in that, Horn 1 (21) is integrally formed inside Horn 3 (23). The sound inlet (211) of Horn 1 (21) is opened on the second reflector (231) of Horn 3 (23) to connect Horn 1 (21) with the dual-film transducer (3).

5. The directional high-intensity sound device according to claim 3, characterized in that, The second opening (222) of Horn Two (22) is fixedly connected to the second reflector (231) of Horn Three (23) via a mounting post (223).

6. The directional high-intensity sound device according to claim 3, characterized in that, A phase cone (224) is provided on the first reflector (221) of the horn two (22) to adjust the sound wave front surface so that the phase of the sound waves at the center and the edge tends to be consistent.

7. The directional high-intensity sound device according to claim 1, characterized in that, A through hole (14) is provided in the middle of the partition (11). The sound-enhancing component (2) passes through the through hole (14) and communicates with the double membrane transducer (3). A sealing element (5) is provided in the through hole (14) to seal the sound-enhancing component (2) and the double membrane transducer (3).

8. The directional high-intensity sound device according to claim 7, characterized in that, The sealing element (5) includes: a first sealing layer (51), a second sealing layer (52), and a sealing ring (53). The first sealing layer (51) is sealed between the high-intensity acoustic component (2) and the partition (11). The second sealing layer (52) is sealed between the dual-membrane transducer (3) and the partition (11). The sealing ring (53) is disposed in the through hole (14). One end of the sealing ring (53) is connected to the first sealing layer (51), and the other end is connected to the second sealing layer (52).

9. The directional high-intensity sound device according to claim 1, characterized in that, The circuit board assembly (4) includes a power board (41), a logic control board (42) and an audio driver board (43) mounted vertically in the electrical cavity (13). The power board (41) supplies power to the dual-membrane transducer (3), and the logic control board (42) controls the audio driver board (43) to drive the dual-membrane transducer (3) to generate sound waves according to the input audio file.

10. The directional high-intensity sound device according to claim 1, characterized in that, A protective net (15) is provided at the end of the sound cavity (12) opposite to the partition (11), and a base plate (17) is sealed at the end of the electrical cavity (13) opposite to the partition (11). A waterproof aviation plug (18) connected to the circuit board assembly (4) is provided on the base plate (17).

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