Loudspeaker system with large full-band front and back sound pressure level difference

Abstract

The invention relates to the technical field of loudspeakers, in particular to a full-band loudspeaker system with large front and back sound pressure level difference, which comprises a box body, a first mounting plate arranged in the box body, a second mounting plate arranged at an interval with the first mounting plate, a first loudspeaker unit arranged on the first mounting plate and a second loudspeaker unit arranged on the second mounting plate, the plurality of first loudspeaker units are arranged in a rectangular array, the plurality of second loudspeaker units are arranged in a rectangular array, and the plurality of second loudspeaker units are electrically connected with an external processor and an external multi-channel power amplifier. The sound pressure level output facing the residential area is effectively adjusted to be small, the sound pressure level facing the sound listening area is effectively adjusted to be large, the influence of noise disturbing residents is reduced, meanwhile, efficient information transmission is ensured, and use is easy and convenient.

Description

A loudspeaker system with a large sound pressure level difference across the entire frequency range Technical Field

[0001] This invention relates to the field of loudspeaker technology, and more particularly to a loudspeaker system with a large sound pressure level difference across the entire frequency range. Background Technology

[0002] A loudspeaker, commonly known as a "horn," is an electroacoustic transducer that converts electrical signals into sound signals. For sound effects, audio electrical energy, through electromagnetic, piezoelectric, or electrostatic effects, causes the cone or diaphragm to vibrate and resonate with the surrounding air, producing sound. Loudspeakers can be divided into woofers and tweeters. A woofer mainly consists of a permanent magnet, voice coil, diaphragm, and frame. The permanent magnet provides a magnetic field; when the voice coil is energized, it vibrates under the force of the magnetic field, which in turn drives the diaphragm on the frame to emit sounds of different frequencies and intensities. Tweeters typically use horns to increase sound pressure levels to improve radiation efficiency. When the vibration reaches a certain frequency range, it creates a sound that people can perceive. Combining a woofer and a tweeter is called a loudspeaker system. In existing technologies, loudspeaker systems used in playgrounds, squares, and other places between residential areas and other locations are frequently the subject of complaints from residents due to noise pollution. The most direct way to reduce noise pollution is to lower the volume of the loudspeaker system to effectively control the sound at its source. However, low volume can easily lead to inefficient and unclear sound transmission, making it difficult for people to clearly receive information such as announcements, arrangements, and emergencies. While this may solve the noise pollution problem, it fails to truly fulfill the function of information transmission, resulting in a trade-off between the two needs. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a loudspeaker system with a large sound pressure level difference across the entire frequency range.

[0004] To achieve the above objectives, the present invention provides a loudspeaker system with a large sound pressure level difference across the entire frequency range, comprising a cabinet, a first mounting plate disposed on the cabinet, a second mounting plate spaced apart from the first mounting plate, a first loudspeaker unit disposed on the first mounting plate, and a second loudspeaker unit disposed on the second mounting plate. Multiple first loudspeaker units are provided, arranged in a rectangular array. Multiple second loudspeaker units are also provided, arranged in a rectangular array. The second loudspeaker units are electrically connected to an external processor and an external multi-channel power amplifier.

[0005] Preferably, the box body is provided with a dust-proof net. Both ends of the dust-proof net are provided with clamping strips, and both ends of the box body are provided with clamping grooves for accommodating the clamping strips. The dust-proof net is of an arc structure.

[0006] Preferably, the box body is provided with a mounting rack. The mounting rack is of a U-shaped structure. There are mounting screws at the connection between the mounting rack and the box body. A friction pad is provided at one end of the mounting rack close to the mounting screw.

[0007] Preferably, both the first speaker unit and the second speaker unit are full-range speakers.

[0008] Preferably, the box body includes a first assembly rack, a second assembly rack spaced from the first assembly rack, a third speaker unit provided on the first assembly rack, and a fourth speaker unit provided on the second assembly rack. There are multiple third speaker units, and the multiple third speaker units are arranged in a "hui" shape. There are multiple fourth speaker units, and the multiple fourth speaker units are arranged in a "kou" shape. The fourth speaker unit is electrically connected to an external processor and an external multi-channel power amplifier.

[0009] Preferably, the box body is provided with reinforcing ribs. The reinforcing ribs are of an L-shaped structure. There are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged around the circumference of the box body.

[0010] Preferably, the second assembly rack is provided with a cover plate, and the cover plate covers an opening on one side of the second assembly rack.

[0011] Preferably, handle parts are provided on both sides of the box body. The handle parts are provided with mounting holes, and the box body is provided with connection holes communicating with the mounting holes.

[0012] Preferably, support columns are provided between the first assembly rack and the second assembly rack. There are multiple support columns, and the multiple support columns are arranged around the circumference of the first assembly rack and the second assembly rack.

[0013] Preferably, the third speaker unit is a mid-frequency speaker, and the fourth speaker unit is a high-frequency speaker.

[0014] The beneficial effects of the present invention: The sound pressure level output facing the residential area is effectively adjusted to be relatively small, while the sound pressure level facing the listening area is relatively large. It takes into account reducing the impact of noise on residents and also ensures the efficient transmission of information. It is simple and convenient to use. Description of the Drawings

[0015] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0016] Figure 1 is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0017] Figure 2 is an exploded structural diagram of Embodiment 1 of the present invention.

[0018] Figure 3 is a schematic diagram of another angle structure of Embodiment 1 of the present invention.

[0019] Figure 4 is a schematic diagram of the main equipment connections and signal processing flow of Embodiment 1 of the present invention.

[0020] Figure 5 is a structural schematic diagram of Embodiment 2 of the present invention.

[0021] Figure 6 is a schematic diagram of another angle structure of Embodiment 2 of the present invention.

[0022] Figure 7 is an exploded structural diagram of Embodiment 2 of the present invention.

[0023] The reference numerals in the attached drawings include: 1—First mounting plate; 11—First speaker unit; 2—Second mounting plate; 21—Second speaker unit; 3—Enclosure; 31—Snap-fit ​​groove; 32—Handle; 33—Mounting hole; 34—Connection hole; 4—Dustproof mesh; 41—Snap-fit ​​strip; 5—Mounting bracket; 51—Mounting screw; 52—Friction pad; 53—Mounting groove; 6—First assembly bracket; 61—Third speaker unit; 72—Second assembly bracket; 71—Fourth speaker unit; 8—Reinforcing rib; 9—Cover plate; 10—Support column. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] Example 1.

[0027] As shown in Figures 1 to 4, a loudspeaker system with a large sound pressure level difference across the entire frequency band according to the present invention includes a cabinet 3, a first mounting plate 1 disposed on the cabinet 3, a second mounting plate 2 disposed at a distance from the first mounting plate 1, a first loudspeaker unit 11 disposed on the first mounting plate 1, and a second loudspeaker unit 21 disposed on the second mounting plate 2. Multiple first loudspeaker units 11 are provided, arranged in a rectangular array. Multiple second loudspeaker units 21 are provided, arranged in a rectangular array. The second loudspeaker units 21 are electrically connected to an external processor and an external multi-channel power amplifier.

[0028] The first mounting plate 1 is located at one end of the enclosure 3. Multiple first speaker units 11 are arranged in a rectangular array on the first mounting plate 1, facing the listening area. The second mounting plate 2 is located at the other end of the enclosure 3. Multiple second speaker units 21 are arranged in a rectangular array on the second mounting plate 2, facing the residential area. The number of first speaker units 11 and second speaker units 21 are set to 4, 8, 16, or 32 respectively. The change in the number causes a change in directivity; the more units, the narrower the directivity. Furthermore, the multiple second speaker units 21 are electrically connected to an external processor and an external multi-channel power amplifier. The processor includes a crossover and a delay unit. The crossover separates the input audio signal into different parts such as high, mid, and low frequencies, and the delay unit adjusts the sound pressure level. The signal is then amplified by the external multi-channel power amplifier. Amplifying weak audio signals to drive the second speaker unit 21 directly determines the energy distribution across frequency bands, optimizing the overall sound pressure level. A bass gain knob provides sufficient low-frequency extension and volume to compensate for low-frequency radiation efficiency. A treble output level knob prevents harsh or weak treble, ensuring a suitable proportion of treble in the total sound pressure level. This balances the relative levels of each frequency band to achieve the designed total sound pressure level. A delay unit, by delaying signal arrival time to achieve coaxiality, precisely controls the time difference between the output of multiple second speaker units 21, using phase cancellation to reduce sound and adjust the sound pressure level accordingly. This ensures the sound pressure level of multiple first speaker units 11 is normal, guaranteeing clear communication in the listening area and reducing the sound pressure level of multiple second speaker units 21, thus minimizing noise interference in residential areas. This invention effectively adjusts the sound pressure level output towards residential areas to be lower, while increasing the sound pressure level towards the listening area, balancing noise reduction with efficient information transmission. It is simple and convenient to use.

[0029] In this embodiment, the enclosure 3 is equipped with a dustproof mesh 4. Both ends of the dustproof mesh 4 are provided with snap-fit ​​strips 41, and both ends of the enclosure 3 are provided with snap-fit ​​grooves 31 for accommodating the snap-fit ​​strips 41. The dustproof mesh 4 has an arc-shaped structure. Specifically, the dustproof mesh 4 is connected to the snap-fit ​​grooves 31 via the snap-fit ​​strips 41, making installation and disassembly simple and convenient. The dustproof mesh 4 is typically made of metal mesh, high-density fiber material, or microporous breathable material. The arc-shaped dustproof mesh 4 covers the opening of the speaker, and its core function is to physically block dust, lint, fine particles, and liquid splashes into the acoustic structure inside the enclosure 3, while ensuring sound transmission. The dustproof mesh 4 achieves a balance between protection and sound quality through precise design. It generally adopts a microporous structure with a pore size typically less than 0.5 mm, effectively filtering impurities and preventing dust accumulation that could cause blockage or aging, thereby avoiding decreased sound volume, blurring, or distortion.

[0030] In this embodiment, the housing 3 is provided with a mounting bracket 5, which has a U-shaped structure. A mounting screw 51 is provided at the connection between the mounting bracket 5 and the housing 3. A friction pad 52 is provided at one end of the mounting bracket 5 near the mounting screw 51. Specifically, the U-shaped mounting bracket 5 supports the housing 3, and the mounting bracket 5 is fixed to the housing 3 by the mounting screw 51. The friction pad 52 increases the friction between the housing 3 and the mounting bracket 5, improving the stability of the connection.

[0031] In this embodiment, the mounting bracket 5 has a mounting groove 53 at its bottom. Multiple mounting grooves 53 are provided and arranged at intervals along the length of the mounting bracket 5. Specifically, the multiple mounting grooves 53 are arranged at intervals along the length of the mounting bracket 5. Screws are passed through the mounting grooves 53 and connected and fixed to the corresponding positions to facilitate fixing the position of the mounting bracket 5 and simplify installation and disassembly.

[0032] In this embodiment, both the first speaker unit 11 and the second speaker unit 21 are full-range speakers. Specifically, both the first speaker unit 11 and the second speaker unit 21 are full-range speakers. A full-range speaker is a type of speaker that can cover a wide frequency range. Early full-range speakers had a frequency range of 200Hz to 10000Hz (wavelength of 3.4cm to 1.7m), which has been extended to 50Hz to 25000Hz (wavelength of 1.4cm to 6.9m) in recent years through technological upgrades. It adopts a layered design with dual diaphragms: the first diaphragm is responsible for the mid and low frequencies, and the second diaphragm extends the high-frequency response. The spider connection structure can effectively suppress large-amplitude polarization, and the breathable mesh material is used to adjust the acoustic damping to optimize the low-frequency performance.

[0033] Example 2.

[0034] Referring to FIGS. 5 to 7 of the accompanying drawings of the specification, it can be seen that the difference between Embodiment 2 and Embodiment 1 is that the cabinet 3 includes a first mounting rack 6, a second mounting rack 7 spaced apart from the first mounting rack 6, a third speaker unit 61 disposed on the first mounting rack 6, and a fourth speaker unit 71 disposed on the second mounting rack 7. A plurality of the third speaker units 61 are arranged in a "hui" character shape, and a plurality of the fourth speaker units 71 are arranged in a "kou" character shape. The fourth speaker unit 71 is electrically connected to an external processor and an external multi-channel power amplifier. Specifically, the first mounting rack 6 is disposed at one end of the cabinet 3, and a plurality of the third speaker units 61 are arranged in a "hui" character shape on the first mounting rack 6, and a plurality of the third speaker units 61 are used facing the listening area. The second mounting rack 7 is disposed at the other end of the cabinet 3, and a plurality of the fourth speaker units 71 are arranged in a "kou" character shape on the second mounting rack 7, and a plurality of the fourth speaker units 71 are used facing the residential area. The number of the third speaker units 61 and the number of the fourth speaker units 71 are respectively set to 4, 8, 16 or 32. The change in the number causes a change in directivity. The more the number, the narrower the directivity. Moreover, a plurality of the fourth speaker units 71 are electrically connected to an external processor and an external multi-channel power amplifier. The processor includes a frequency divider and a delay unit. The input audio signal is separated into different parts such as high frequency, middle frequency, and low frequency by the frequency divider, and then the weak audio signal is amplified by the external multi-channel power amplifier to drive the fourth speaker unit 71 to emit sound, which directly determines the energy distribution of each frequency band and can optimize the overall sound pressure level performance. The bass gain knob is used to provide sufficient low-frequency subwoofer and quantity to compensate for the problem of low low-frequency radiation efficiency. Then, the high-frequency output level knob is used to prevent the high frequency from being harsh or too weak to ensure that the high frequency accounts for an appropriate proportion in the total sound pressure, so as to balance the relative levels of each frequency band to achieve the designed total sound pressure level target. There is also a delay unit, which realizes coaxialization by delaying the signal arrival time. It is mainly used to precisely control the time difference of the sound emission of a plurality of the fourth speaker units 71, and use phase cancellation to weaken the sound, and perform corresponding correction adjustments on the sound pressure level, so that the sound pressure level of a plurality of the third speaker units 61 is normal, ensuring clear transmission of notifications in the listening area, and reducing the sound pressure level of a plurality of the fourth speaker units 71, reducing the impact of noise interference on residents.

[0035] In this embodiment, the housing 3 is provided with reinforcing ribs 8, which are L-shaped and multiple in number, arranged around the circumference of the housing 3. Specifically, the reinforcing ribs 8 are L-shaped and multiple in number are arranged around the circumference of the housing 3. By adding longitudinal and transverse rib structures inside the housing 3, the supporting force is increased without significantly increasing the wall thickness, thereby greatly improving the resistance to bending and torsion, making the housing 3 less prone to deformation under stress.

[0036] In this embodiment, the second assembly frame 7 is provided with a cover plate 9, which covers one side opening of the second assembly frame 7. Specifically, the cover plate 9 covers one side opening of the second assembly frame 7, and can cover the messy wiring and component arrangement inside the box 3, making the box 3 look simple and neat. At the same time, it can prevent external dust, dirt, and debris from directly entering the interior of the box 3, avoiding pollution that could lead to short circuits or blockages, thus providing good protection.

[0037] In this embodiment, handles 32 are provided on both sides of the box body 3. Each handle 32 has a mounting hole 33, and the box body 3 has a connecting hole 34 that communicates with the mounting hole 33. Specifically, external screws are passed through the mounting hole 33 and then connected and fixed to the connecting hole 34, thereby fixing the handles 32 to both sides of the box body 3. This allows users to easily carry, move, or transport the box body 3 using the handles 32, improving operational safety.

[0038] In this embodiment, a support column 10 is provided between the first assembly frame 6 and the second assembly frame 7. Multiple support columns 10 are provided, arranged circumferentially around the first assembly frame 6 and the second assembly frame 7. Specifically, the multiple support columns 10 arranged circumferentially around the first assembly frame 6 and the second assembly frame 7 enhance the mutual support and load-bearing stability between the first assembly frame 6 and the second assembly frame 7, thereby improving structural strength.

[0039] In this embodiment, the third speaker unit 61 is a mid-range speaker, and the fourth speaker unit 71 is a high-frequency speaker. Specifically, the third speaker unit 61 is a mid-range speaker with a frequency response range of 256Hz to 8000Hz. Since it covers the range of 1kHz to 4kHz, which is the most sensitive range for the human ear, an excellent mid-range unit can provide highly engaging vocal performance. The mid-range unit can provide clean and powerful support, strong rhythm, and clean timbre. Compared to bass, it lacks a sense of fullness, and compared to treble, it lacks a sense of harshness, achieving a "golden balance." The fourth speaker unit 71 is a high-frequency speaker with a frequency response range of 3000Hz to 20kHz. The high-frequency speaker has a small diameter and a light diaphragm, which means it has higher electroacoustic conversion efficiency, making it easier to drive large dynamic signals and convenient to adjust the sound pressure level. Because high-frequency sound waves have extremely short wavelengths and propagate almost in a straight line, they have strong directivity.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A loudspeaker system with a large sound pressure level difference across the entire frequency range, characterized in that: It includes a box body, a first mounting plate arranged on the box body, a second mounting plate arranged at an interval from the first mounting plate, a first speaker unit arranged on the first mounting plate, and a second speaker unit arranged on the second mounting plate. A plurality of the first speaker units are arranged in a rectangular array, and a plurality of the second speaker units are arranged in a rectangular array. The second speaker unit is electrically connected to an external processor and an external multi-channel power amplifier.

2. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 1, characterized in that: The box body is provided with a dust-proof net. Both ends of the dust-proof net are provided with clamping strips, and both ends of the box body are provided with clamping grooves for accommodating the clamping strips. The dust-proof net is of an arc-shaped structure.

3. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 2, characterized in that: The box body is provided with a mounting bracket. The mounting bracket is of a U-shaped structure. There are mounting screws at the connection between the mounting bracket and the box body, and a friction pad is provided at one end of the mounting bracket close to the mounting screw.

4. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 1, characterized in that: Both the first speaker unit and the second speaker unit are full-frequency speakers.

5. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 1, characterized in that: The box body includes a first assembly frame, a second assembly frame arranged at an interval from the first assembly frame, a third speaker unit arranged on the first assembly frame, and a fourth speaker unit arranged on the second assembly frame. A plurality of the third speaker units are arranged in a "return" shape, and a plurality of the fourth speaker units are arranged in a "square" shape. The fourth speaker unit is electrically connected to an external processor and an external multi-channel power amplifier.

6. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 5, characterized in that: The box body is provided with reinforcing ribs. The reinforcing ribs are of an L-shaped structure, and a plurality of them are arranged around the circumference of the box body.

7. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 5, characterized in that: The second assembly frame is provided with a cover plate, and the cover plate covers an opening on one side of the second assembly frame.

8. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 5, characterized in that: Both sides of the box body are provided with handle parts. The handle parts are provided with mounting holes, and the box body is provided with connection holes communicating with the mounting holes.

9. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 5, characterized in that: There are support columns between the first assembly frame and the second assembly frame. A plurality of support columns are arranged around the circumference of the first assembly frame and the second assembly frame.

10. A loudspeaker system with a large sound pressure level difference across the entire frequency range according to claim 5, characterized in that: The third speaker unit is a mid-frequency speaker, and the fourth speaker unit is a high-frequency speaker.

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