A directional speaker that can reduce noise

Abstract

This utility model discloses a noise-reducing directional speaker, including a cabinet. The inner cavity of the cabinet is provided with a sound-insulating panel, and the inner cavities of the cabinet and the sound-insulating panel are respectively provided with a first sound-insulating layer and a second sound-insulating layer. Speakers are symmetrically arranged within the inner cavity of the sound-insulating panel. This utility model relates to the field of speaker technology. This noise-reducing directional speaker effectively reduces noise by precisely controlling sound propagation within a certain area and at a 15° angle, thus solving the noise interference of traditional campus broadcasting systems on nearby residential buildings, offices, teaching buildings, etc., ensuring teaching quality and creating a quiet environment.

Description

Technical Field

[0001] This utility model relates to the field of speaker technology, specifically to a directional speaker that can reduce noise. Background Technology

[0002] A speaker is a device that converts electrical signals into sound signals and is an extremely important component of an audio system. It uses a built-in power amplifier to amplify the audio signal before reproducing the sound, thus increasing its volume.

[0003] Traditional campus broadcasting systems typically use omnidirectional loudspeakers or ordinary directional loudspeakers for sound propagation. These systems have a wide sound wave radiation range and poor directionality, easily causing noise pollution. Specific problems are as follows: Severe sound wave diffusion: Traditional loudspeakers radiate sound evenly in all directions in the form of spherical waves, resulting in wasted sound energy and an inability to effectively control the sound propagation range, causing noise interference to surrounding residential areas, office buildings, school buildings, etc.

[0004] Insufficient sound pressure level control: Although existing directional loudspeaker technologies (such as horn and waveguide types) can focus sound to a certain extent, the front-to-back sound pressure ratio is usually less than 15dB, and there are still obvious problems of sound leakage to the sides and rear.

[0005] Lack of intelligent adjustment capabilities: Traditional broadcasting systems cannot dynamically adjust the beam angle and coverage area according to the usage scenario, making it difficult to optimize the acoustic environment of open areas such as playgrounds and squares. Utility Model Content

[0006] In view of the shortcomings of the existing technology, this utility model provides a noise-reducing directional speaker, which solves the problem of noise interference from traditional campus broadcasting systems to nearby residential buildings, offices, teaching buildings, etc., thereby ensuring teaching quality and creating a quiet environment.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a noise-reducing directional speaker box, including a box body, the inner cavity of the box body is provided with a sound insulation board, and the inner cavities of the box body and the sound insulation board are respectively provided with a first sound insulation layer and a second sound insulation layer, and loudspeakers are symmetrically arranged in the inner cavity of the sound insulation board.

[0008] The loudspeaker includes a housing, and a mounting cylinder is fixedly installed in the inner cavity of the housing. A speaker is installed in the inner cavity of the mounting cylinder by screws. A sound-transmitting opening is provided on the surface of the mounting cylinder. A sleeve is installed on the surface of the mounting cylinder by screws, and the sleeve is located in the inner cavity of the housing. The port of the housing expands from top to bottom and outward.

[0009] Preferably, the expansion angle of the outer shell port is 15°, and the enclosure and sound insulation panel are made of aluminum alloy.

[0010] Preferably, the inner wall of the sound insulation panel is provided with an integrated control module, which is electrically connected to the speaker.

[0011] Preferably, a filter screen is fixedly installed on the surface of the housing.

[0012] Preferably, rotating frames are rotatably connected to both sides of the housing.

[0013] Preferably, a tripod is provided at the bottom of the rotating frame.

[0014] This invention provides a directional speaker that can reduce noise. Compared with the prior art, it has the following advantages: 1. This noise-reducing directional speaker uses a combination of four speaker arrays arranged vertically to form a narrow vertical directivity through interference effect. The four speaker unit arrays can also be controlled by active module digital signal processing and software to control the sound field distribution and phase modulation to synthesize directional beams, so that the sound pressure level difference between the front and rear of the device is >20dB.

[0015] 2. This noise-reducing directional speaker features an all-aluminum alloy cabinet, all-weather outdoor waterproof, rainproof, corrosion-resistant, and temperature-resistant design, with a waterproof rating of IP66, making it suitable for extreme weather conditions and boasting a long service life.

[0016] 3. This noise-reducing directional speaker uses damping sound insulation materials in the first and second sound insulation layers to improve the sound insulation effect through multiple layers. The addition of sound-absorbing materials in the composite double-layer structure can suppress standing waves and improve low-frequency transients, while the rigid materials of the cabinet and sound insulation board reduce resonance and maintain high-frequency clarity.

[0017] 4. This noise-reducing directional speaker uses ABS plastic for the speaker enclosure to reduce resonance and maintain high-frequency clarity. It employs a semi-enclosed waveguide design with a central sleeve. The sleeve optimizes high-frequency efficiency by controlling the radiation impedance and directivity of the sound waves to achieve minimal energy loss. The cross-sectional area expands exponentially, smoothly transitioning acoustic impedance, suppressing low frequencies, and simultaneously increasing high-frequency sensitivity and improving mid-to-high frequency directivity.

[0018] 5. This noise-reducing directional speaker features a 15° expansion angle at the outer shell port and a narrow opening design, allowing the beam spread angle to propagate within a controlled 15° range. This enables more precise control of the high-frequency beam width, and the exponential or hyperbolic expansion reduces sound wave reflection, ensuring smooth sound energy transmission. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the speaker structure of this utility model; Figure 3 This is a top view of the speaker enclosure of this utility model; Figure 4 This is a bottom view of the speaker box structure of this utility model; Figure 5 This is a schematic diagram showing the disassembled structure of the speaker of this utility model.

[0020] In the diagram: 1. Housing; 2. Rotating frame; 3. Tripod; 4. Filter screen; 5. Sound insulation board; 6. Integrated control module; 7. Speaker; 71. Housing; 72. Horn; 73. Sleeve; 74. Mounting sleeve; 8. First sound insulation layer; 9. Second sound insulation layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-2 This utility model provides a technical solution: a noise-reducing directional speaker, including a cabinet 1, an inner cavity of the cabinet 1 with a sound insulation board 5, and the inner cavities of the cabinet 1 and the sound insulation board 5 respectively with a first sound insulation layer 8 and a second sound insulation layer 9, a speaker 7 symmetrically arranged in the inner cavity of the sound insulation board 5, a filter plate 4 fixedly installed on the surface of the cabinet 1, and a rotating frame 2 rotatably connected to both sides of the cabinet 1. Preferably, a tripod 3 is provided at the bottom of the rotating frame 2, wherein the tripod 3 is used for support and placement, and the rotating frame 2 can rotate the cabinet 1. Due to the existence of resistance, the cabinet 1 will be automatically fixed after rotation for angle adjustment. The cabinet 1 and the sound insulation board 5 are made of aluminum alloy, and an integrated control module 6 is provided on the inner wall of the sound insulation board 5. The integrated control module 6 is electrically connected to the speaker 7.

[0023] The directional speaker uses a 7-unit array of four speakers arranged vertically to create a narrow vertical directivity of ±10° through interference. The sound field distribution and phase modulation of this 7-unit array can also be controlled via active digital signal processing (DSP) software to synthesize a directional beam, resulting in a sound pressure level difference of >20dB between the front and rear of the device.

[0024] The speaker enclosure is made entirely of aluminum alloy, featuring all-weather outdoor waterproof, rainproof, corrosion-resistant, and temperature-resistant design. It boasts an IP66 waterproof rating, making it suitable for extreme weather conditions and offering a long service life. The first sound insulation layer 8 and the second sound insulation layer 9 use damping sound insulation materials, such as sound-absorbing foam and coatings, to improve the sound insulation effect through multiple layers. Adding sound-absorbing materials to the composite double-layer structure can suppress standing waves and improve low-frequency transients. The rigid materials of the enclosure 1 and the sound insulation board 5, such as ABS and aluminum alloy, reduce resonance high-frequency distortion by <1% and maintain high-frequency clarity.

[0025] The integrated control module 6 is used to adjust the audio of the speaker 7, and it has an internal APP software control module that can connect to a mobile phone, allowing audio adjustment to be performed via the mobile APP.

[0026] Please see Figures 3-5 The speaker 7 includes a housing 71, and a mounting cylinder 74 is fixedly installed in the inner cavity of the housing 71 by screws. A speaker 72 is installed in the inner cavity of the mounting cylinder 74 by screws. A sound-transmitting opening is provided on the surface of the mounting cylinder 74, which is aligned with the sound outlet of the speaker 72. A sleeve 73 is installed on the surface of the mounting cylinder 74 by screws, and the sleeve 73 is located in the inner cavity of the housing 71. The port of the housing 71 expands from top to bottom and outward.

[0027] The speaker 7 has a shell made of ABS plastic to reduce resonance and maintain high-frequency clarity. It adopts a semi-enclosed waveguide design with a middle sleeve 73. The sleeve 73 optimizes high-frequency efficiency by controlling the radiation impedance and directivity of the sound waves to achieve minimum energy loss. The cross-sectional area expands exponentially, which can smoothly transition the acoustic impedance, suppress low frequencies, and increase high-frequency sensitivity and improve mid-high frequency directivity.

[0028] The 71-port expansion angle of the housing is 15°, and the narrow opening design allows the beam spread angle to propagate within a controlled 15° range. The pointing angle can more accurately control the high-frequency beam width, and the exponential or hyperbolic expansion reduces sound wave reflection, ensuring smooth sound energy transmission.

[0029] A 2-inch mid-high frequency speaker 72 is installed in the middle of the mounting cylinder 74. The speaker 72 has a power of 30W. The speaker 72 is small, has a high sound pressure level, prominent high frequencies, clear vocals, and low frequencies. It can effectively prevent excessive low frequencies from affecting the equipment at close range behind it, and can also improve the sensitivity of high frequency directivity.

[0030] Additionally, it should be noted that, depending on customer needs, the directional speaker design offers three different functional options: constant voltage directional speaker, active constant impedance directional speaker, and network IP broadcast directional speaker.

[0031] Product series: 1. Constant voltage directional speaker with 100V input 2. Active directional speakers with DSP effect adjustment 3. The network IP broadcast directional speaker has a built-in network playback module. Technical specifications: Constant voltage directional speaker, 100V input Rated power: 120W Sensitivity: 110dB ± 3dB Frequency response: 100Hz-20kHz Maximum sound pressure level: 120 dB Sound pressure level difference between front and rear sides: >20 dB Input method: 100V input Waterproof rating: IPX6 Product Color: White Operating temperature: -30 to 65 degrees Celsius Product dimensions: 925 x 250 x 230 mm (Length x Width x Height) Product weight: 32.5KG Directional angle: 15° Orientation boundary: 15-30 degrees Sound emission distance: 100 meters II. Technical Specifications: Active directional speaker with DSP effect adjustment Rated power: 120W Sensitivity: 110dB ± 3dB Frequency response: 100Hz-20kHz Maximum sound pressure level: 120 dB Sound pressure level difference between front and rear sides: >20 dB Input method: Constant resistance 8 ohms Operating voltage: AC220V Waterproof rating: IP66 Product Color: White Operating temperature: -30 to 65 degrees Celsius Product dimensions: 925 x 250 x 230 mm (Length x Width x Height) Product weight: 32KG Directional angle: 15° Orientation boundary: 15-30 degrees Sound emission distance: 100 meters III. Technical Specifications: Network IP Broadcast Directional Speaker with Built-in Network Playback Module Rated power: 120W Sensitivity: 110dB ± 3dB Frequency response: 100Hz-20kHz Maximum sound pressure level: 120 dB Sound pressure level difference between front and rear sides: >20 dB Input impedance: 8 ohms Operating voltage: AC220V Network: Wide Area Network (WAN) or Local Area Network (LAN) Waterproof rating: IPX6 Product Color: White Operating temperature: -30 to 65 degrees Celsius Product dimensions: 925 x 250 x 230 mm (Length x Width x Height) Product weight: 32.5KG Directional angle: 15° Orientation boundary: 15-30 degrees Sound emission distance: 100 meters The difference between directional speakers and ordinary speakers Selective speakers are suitable for scenarios where it is necessary to control the sound field range, reduce noise interference with the surrounding environment, or protect privacy, such as school playgrounds, squares, and residential buildings.

[0032] Choose ordinary speakers: for home use, public address music appreciation, or live performances where you want a natural sound field and full-range performance.

[0033] When the directional speaker of this application is in operation or use, when the speaker 72 propagates sound, it first controls the radiation impedance and directionality of the sound wave through the sleeve 73, optimizes high-frequency efficiency to achieve minimum energy loss, and expands the cross-sectional area exponentially to smoothly transition the acoustic impedance, suppress low frequencies, increase high-frequency sensitivity, improve mid-high frequency directivity, filter low frequencies, and retain only high frequencies. Then, the high-frequency sound propagates through the shell 71 with an expansion angle of 15° so that the beam spread angle is controlled within a 15° area. The directional signal angle can more accurately control the high-frequency beam width. The exponential or hyperbolic expansion reduces sound wave reflection and ensures smooth sound energy transmission. By accurately controlling the sound to propagate radially in a certain area and at a 15° angle, noise is effectively reduced, solving the noise interference of traditional campus broadcasting systems to nearby residential buildings, offices, office buildings, and teaching buildings, ensuring teaching quality and creating a quiet environment.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A noise-reducing directional speaker comprising a cabinet (1), characterized in that: The inner cavity of the enclosure (1) is provided with a sound insulation board (5), and the inner cavities of the enclosure (1) and the sound insulation board (5) are respectively provided with a first sound insulation layer (8) and a second sound insulation layer (9). The inner cavity of the sound insulation board (5) is symmetrically provided with a loudspeaker (7). The loudspeaker (7) includes a housing (71), and a mounting cylinder (74) is fixedly installed in the inner cavity of the housing (71). A speaker (72) is installed in the inner cavity of the mounting cylinder (74) by screws. A sound-transmitting hole is opened on the surface of the mounting cylinder (74). A sleeve (73) is installed on the surface of the mounting cylinder (74) by screws. The sleeve (73) is located in the inner cavity of the housing (71). The port of the housing (71) expands from top to bottom and outward.

2. The noise reducing directional speaker of claim 1, wherein: The port expansion angle of the outer shell (71) is 15°, and the box body (1) and the sound insulation plate (5) are made of aluminum alloy.

3. The noise reducing directional speaker of claim 1, wherein: The inner wall of the sound insulation panel (5) is provided with an integrated control module (6), which is electrically connected to the speaker (7).

4. The noise reducing directional speaker of claim 1, wherein: A filter screen plate (4) is fixedly installed on the surface of the box (1).

5. The noise reducing directional speaker of claim 4, wherein: The two sides of the box (1) are rotatably connected to rotating frames (2).

6. The noise reducing directional speaker of claim 5, wherein: The bottom of the rotating frame (2) is provided with a tripod (3).

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