High-fidelity Bluetooth sound box

Abstract

The invention discloses a high-fidelity Bluetooth sound box, which comprises a box body, a loudspeaker module and a PCB (Printed Circuit Board), and is characterized in that the PCB is electrically connected with the loudspeaker module; the box body comprises an installation cavity and two sound cavities, the two sound cavities are arranged at the two ends of the installation cavity, the PCB is installed in the installation cavity, and the loudspeaking modules are arranged in the two sound cavities respectively; the box body is an aluminum alloy frame, each sound cavity is provided with a medium-density fiber layer, a sound absorption layer and a mesh enclosure, the mesh enclosure is arranged at the opening of the end part of the sound cavity, the medium-density fiber layer covers the surface of the inner wall of the sound cavity, and the sound absorption layer covers the surface of one side, opposite to the inner wall of the sound cavity, of the medium-density fiber layer; the loudspeaking module comprises two loudspeaker units, and the two loudspeaker units are installed in the two sound cavities respectively. According to the high-fidelity Bluetooth loudspeaker box, the structural design of the box body is optimized, the high-fidelity Bluetooth loudspeaker box is made of an aluminum alloy material, and the medium-density fiber layer and the sound absorption layer are arranged in the sound cavity, so that the influence of heat accumulation, resonance, sound dyeing, medium-frequency standing waves and high-frequency reflection on sound definition is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of Bluetooth speakers, and particularly to a high-fidelity Bluetooth speaker. Background Art

[0002] A high-fidelity Bluetooth speaker is a wireless audio device with high sound quality, detail restoration ability, and a wide audio spectrum. It connects to other devices (such as smartphones, tablets, computers, etc.) through Bluetooth technology and can provide sound quality close to the original recording. Compared with general Bluetooth speakers, high-fidelity Bluetooth speakers have higher requirements in terms of sound quality and performance. The design goal of a high-fidelity Bluetooth speaker is to retain and restore music details as much as possible, including the performance of low, medium, and high frequencies. It uses high-quality speaker units and optimized audio processing technologies to avoid distortion and provide clear and natural sound quality. It is usually equipped with a high-performance digital-to-analog converter (DAC) to convert digital signals (audio from Bluetooth transmission) into analog signals to ensure the detail restoration and accuracy of audio. Secondly, by adopting a low-distortion and high-efficiency power amplifier (power amplifier), such as a Class D power amplifier, it can provide strong output power while maintaining high energy efficiency.

[0003] The main feature of a high-fidelity Bluetooth speaker is to minimize audio loss through high-quality hardware and technical means, and restore a more pure and delicate sound quality. It is suitable not only for music enthusiasts and professionals but also for any users with high requirements for sound quality. Compared with ordinary Bluetooth speakers, high-fidelity Bluetooth speakers have more accurate sound quality and a wider dynamic range, and can truly restore the details of each note. However, the existing high-fidelity Bluetooth speakers still have deficiencies in the design of the sound cavity structure, and the inner wall of the sound cavity is prone to cause problems such as sound coloring and resonance, which affect the clarity of the output sound. Summary of the Invention

[0004] Based on this, in view of the technical problem that the sound quality of the existing high-fidelity Bluetooth speaker still has room for improvement, it is necessary to provide a high-fidelity Bluetooth speaker.

[0005] A high-fidelity Bluetooth speaker, which includes a box body, a speaker module, and a PCB board. The speaker module and the PCB board are both arranged inside the box body, and the PCB board is electrically connected to the speaker module. Thus, the speaker module can be Bluetooth-connected to an external device through the PCB board.

[0006] The box body includes an installation cavity and two sound cavities. The two sound cavities are arranged at both ends of the installation cavity. The PCB board is installed in the installation cavity, and the speaker modules are respectively arranged in the two sound cavities, so that a speaker structure is formed at both ends of the box body.

[0007] The box body is made of an aluminum alloy frame, and each sound cavity is provided with a medium-density fiber layer, a sound-absorbing layer, and a mesh cover. The mesh cover is arranged at the open end of the sound cavity. The medium-density fiber layer covers the inner wall surface of the sound cavity, and the sound-absorbing layer covers the surface of the medium-density fiber layer on the side facing away from the inner wall of the sound cavity.

[0008] The speaker module includes two speaker units, which are respectively installed in two sound cavities. Each speaker unit is arranged at the open end of the corresponding sound cavity, and the speaker unit is arranged facing the mesh cover, and the mesh cover can effectively protect the speaker unit.

[0009] In one embodiment, each of the above-mentioned sound cavities is further provided with an annular support structure. The inner surface of the support structure is cooperatively connected with the corresponding speaker unit, and the outer surface of the support structure is cooperatively connected to the inner wall of the end of the sound cavity. Thus, each speaker unit can be stably installed in the sound cavity through the corresponding support structure, thereby improving the installation stability between the speaker unit and the box body.

[0010] In one embodiment, the above-mentioned medium-density fiber layer is made of an MDF board and is attached to the inner wall surface of the corresponding sound cavity to form a closed and combined cylindrical medium-density fiber layer.

[0011] In one embodiment, the thickness of the above-mentioned medium-density fiber layer is set to 12 mm.

[0012] In one embodiment, the above-mentioned sound-absorbing layer uses polyester fiber sound-absorbing cotton.

[0013] In one embodiment, each of the above-mentioned mesh covers is further provided with an acoustically breathable cloth, and the acoustically breathable cloth is attached to the surface of the mesh cover on the side facing the inside of the sound cavity.

[0014] In one embodiment, the above-mentioned speaker module further includes two diaphragms, which are respectively arranged in two sound cavities, and each diaphragm is arranged at one end of the corresponding sound cavity facing the installation cavity, and the diaphragm is arranged facing the corresponding speaker unit.

[0015] In one embodiment, the above-mentioned PCB board is provided with a Bluetooth receiving module, a decoding module, and a power amplifier module. The Bluetooth receiving module, the decoding module, the power amplifier module, and the speaker module are electrically connected in sequence. Thus, the Bluetooth receiving module is used for Bluetooth communication with external devices. The decoding module can perform digital-to-analog conversion on the electrical signals received by the Bluetooth receiving module, and then perform power amplification through the power amplifier module, and combine with the speaker module to realize the sound output process.

[0016] In one embodiment, the above-mentioned Bluetooth receiving module uses the QCC5125 chip of Qualcomm.

[0017] In one embodiment, the above decoding module uses a TI PCM5122 DAC chip.

[0018] In one embodiment, the above power amplifier module uses a TPA3116D2 dual-channel class-D power amplifier chip.

[0019] In one embodiment, the above decoding module and the Bluetooth receiving module are connected using shielded twisted pair wires to reduce interference and at the same time shorten the path between the decoding module and the power amplifier module, thereby reducing signal attenuation and interference.

[0020] In one embodiment, a low-pass filter is further provided at the output end of the above power amplifier module. A 1 μH inductor and a 220 nF capacitor are used in combination at the power amplifier output to filter out high-frequency noise and ensure that the amplified signal has no obvious distortion.

[0021] In one embodiment, the above high-fidelity Bluetooth speaker further includes a battery module. The battery module is installed in the installation cavity, and the battery module is electrically connected to the PCB board and the speaker module respectively to supply power to the PCB board and the speaker module.

[0022] The above high-fidelity Bluetooth speaker optimizes the structural design of the box body, uses aluminum alloy material, and sets a medium-density fiber layer and a sound-absorbing layer in the sound cavity to effectively reduce the impact of heat accumulation, resonance, sound coloration, mid-frequency standing waves, and high-frequency reflections on the sound clarity. At the same time, by reducing the vibration of the speaker unit, the sound coloration is further reduced, and the distortion of the sound output by the high-fidelity Bluetooth speaker is reduced. Specifically, the box body is set as an aluminum alloy frame, and each sound cavity is provided with a medium-density fiber layer, a sound-absorbing layer, and a mesh cover. The mesh cover is set at the open end of the sound cavity. The medium-density fiber layer covers the inner wall surface of the sound cavity, and the sound-absorbing layer covers the surface of the medium-density fiber layer facing away from the inner wall of the sound cavity. Among them, the aluminum alloy box body can effectively improve the appearance texture and heat dissipation effect of the high-fidelity Bluetooth speaker, thereby effectively avoiding the impact of the heat generated during the operation of the speaker module and the PCB board on the sound output; the medium-density fiber layer can effectively reduce resonance and sound coloration, and the sound-absorbing layer can reduce mid-frequency standing waves and high-frequency reflections, thereby improving the sound clarity. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a high-fidelity Bluetooth speaker in one embodiment; Figure 2 It is an exploded structural diagram of a high-fidelity Bluetooth speaker in one embodiment; Figure 3 It is a schematic structural diagram of the PCB board of a high-fidelity Bluetooth speaker in one embodiment. Detailed Embodiments

[0024] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0030] Please refer to Figures 1 to 3, the present invention discloses a high-fidelity Bluetooth speaker, which includes a cabinet 100, a speaker module 200, and a PCB board 300. The speaker module 200 and the PCB board 300 are both disposed inside the cabinet 100, and the PCB board 300 is electrically connected to the speaker module 200. Thus, the speaker module 200 can be Bluetooth-connected to an external device through the PCB board 300. Among them, the cabinet 100 includes an installation cavity a and two sound cavities b. The two sound cavities b are disposed at both ends of the installation cavity a. The PCB board 300 is installed in the installation cavity a, and the speaker module 200 is respectively disposed in the two sound cavities b, so that a sound-emitting structure is formed at both ends of the cabinet 100, thereby expanding the sound-emitting range of the high-fidelity Bluetooth speaker. Specifically, the cabinet 100 is set as an aluminum alloy frame, and each sound cavity b is provided with a medium-density fiber layer 110, a sound-absorbing layer 120, and a grille 130. The grille 130 is disposed at the open end of the sound cavity b. The medium-density fiber layer 110 covers the inner wall surface of the sound cavity b, and the sound-absorbing layer 120 covers the surface of the medium-density fiber layer 110 on the side facing away from the inner wall of the sound cavity b. The aluminum alloy cabinet 100 can effectively improve the appearance texture and heat dissipation effect of the high-fidelity Bluetooth speaker, thereby effectively preventing the heat generated during the operation of the speaker module 200 and the PCB board 300 from affecting the sound output; the medium-density fiber layer 110 can effectively reduce resonance and sound coloring, and the sound-absorbing layer 120 can reduce mid-frequency standing waves and high-frequency reflections, thereby improving the clarity of the sound. At the same time, the speaker module 200 includes two speaker units 210. The two speaker units 210 are respectively installed in the two sound cavities b. Each speaker unit 210 is disposed at the open end of the corresponding sound cavity b, and the speaker unit 210 is disposed facing the grille 130. The grille 130 can effectively protect the speaker unit 210. More specifically, each sound cavity b is further provided with an annular support structure 140. The inner surface of the support structure 140 is cooperatively connected with the corresponding speaker unit 210, and the outer surface of the support structure 140 is cooperatively connected to the inner wall of the end of the sound cavity b. Thus, each speaker unit 210 can be stably installed in the sound cavity b through the corresponding support structure 140, thereby improving the installation stability between the speaker unit 210 and the cabinet 100, reducing the vibration of the speaker unit 210, and further reducing sound coloring. Based on the above settings, the high-fidelity Bluetooth speaker of the present invention optimizes the structural design of the cabinet 100, uses an aluminum alloy material, and sets a medium-density fiber layer 110 and a sound-absorbing layer 120 in the sound cavity b, thereby effectively reducing the influence of heat accumulation, resonance, sound coloring, mid-frequency standing waves, and high-frequency reflections on the sound clarity. At the same time, by reducing the vibration of the speaker unit 210, the sound coloring is further reduced, and the distortion of the sound output by the high-fidelity Bluetooth speaker is reduced.

[0031] Further, the medium-density fiber layer 110 is made of an MDF board and is attached to the inner wall surface of the corresponding sound cavity b, thereby forming a closed and combined cylindrical medium-density fiber layer 110. The MDF board has uniform material and good acoustic performance, which can effectively reduce the internal resonance and sound coloration in the sound cavity b, while the closed cylindrical structure can effectively suppress the low-frequency standing wave. In one embodiment, the thickness of the medium-density fiber layer 110 is set to 12 mm.

[0032] Further, the sound absorption layer 120 uses polyester fiber sound absorption cotton to reduce the internal reflection in the sound cavity b, thereby reducing the medium-frequency standing wave and high-frequency reflection and further avoiding sound coloration.

[0033] Further, each grille 130 is also provided with an acoustic breathable fabric (not shown), and the acoustic breathable fabric is attached to the surface of the grille 130 facing the inside of the sound cavity b. Thus, while the grille 130 provides protection for the speaker unit 210, the acoustic breathable fabric can improve the waterproof and dustproof performance of the sound cavity b while ensuring the sound quality transparency.

[0034] Further, the sound module 200 further includes two diaphragms 220. The two diaphragms 220 are respectively arranged in the two sound cavities b, and each diaphragm 220 is arranged at one end of the corresponding sound cavity b facing the installation cavity a, and the diaphragm 220 is arranged facing the corresponding speaker unit 210. Thus, a sealed sound cavity b is formed between the diaphragm 220 and the corresponding pull plate unit, effectively ensuring a good enemy camp effect, and at the same time enabling the sound to be better diffused and reflected in the sound cavity b to improve the volume and sound quality.

[0035] Furthermore, the PCB board 300 is provided with a Bluetooth receiving module 310, a decoding module 320, and a power amplifier module 330. The Bluetooth receiving module 310, the decoding module 320, the power amplifier module 330, and the speaker module 200 are electrically connected in sequence. Thus, the Bluetooth receiving module 310 is used for Bluetooth communication with external devices. The decoding module 320 can perform digital-to-analog conversion on the electrical signals received by the Bluetooth receiving module 310, and then perform power amplification through the power amplifier module 330, combined with the speaker module 200 to achieve the sound output process. Specifically, the Bluetooth receiving module 310 uses Qualcomm's QCC5125 chip, which supports Bluetooth 5.3, has built-in aptX HD and AAC decoding to ensure high-definition Bluetooth audio transmission. Moreover, the QCC5125 chip also integrates a low-power audio DSP to optimize sound effect processing; the decoding module 320 uses a TI PCM5122 DAC chip, which supports an audio sampling rate of up to 24bit / 192kHz, with distortion lower than 0.002% and a dynamic range of 112dB, providing high-resolution audio output; the power amplifier module 330 uses a TPA3116D2 dual-channel class-D power amplifier chip, which has an efficiency of up to 90%, an output power of up to 2*50W, is suitable for use with 2.5-inch to 3-inch speaker units 210, and the output THD+N distortion is lower than 0.1%, effectively ensuring the sound quality clarity. Based on this, the decoding module 320 and the Bluetooth receiving module 310 are connected using shielded twisted pair to reduce interference, and at the same time shorten the path between the decoding module 320 and the power amplifier module 330, thereby reducing signal attenuation and interference. More specifically, a low-pass filter is also provided at the output end of the power amplifier module 330, using a 1μH inductor and a 220nF capacitor in parallel at the power amplifier output to filter out high-frequency noise and ensure that the amplified signal has no obvious distortion.

[0036] Furthermore, the high-fidelity Bluetooth speaker further includes a battery module 400. The battery module 400 is installed in the installation cavity a, and the battery module 400 is electrically connected to the PCB board 300 and the speaker module 200 respectively to supply power to the PCB board 300 and the speaker module 200.

[0037] In summary, the high-fidelity Bluetooth speaker disclosed by the present invention optimizes the structural design of the box body, uses aluminum alloy material, and sets a medium-density fiber layer and a sound-absorbing layer in the sound cavity, so as to effectively reduce the influence of heat accumulation, resonance, sound coloring, mid-frequency standing waves, and high-frequency reflection on the sound clarity. At the same time, by reducing the vibration of the speaker unit, the sound coloring is further reduced, and the distortion of the sound output by the high-fidelity Bluetooth speaker is reduced. Specifically, the box body is set as an aluminum alloy frame, and each sound cavity is provided with a medium-density fiber layer, a sound-absorbing layer, and a mesh cover. The mesh cover is arranged at the open end of the sound cavity. The medium-density fiber layer covers the inner wall surface of the sound cavity, and the sound-absorbing layer covers the surface of the medium-density fiber layer on the side facing away from the inner wall of the sound cavity. Among them, the aluminum alloy box body can effectively improve the appearance texture and heat dissipation effect of the high-fidelity Bluetooth speaker, thereby effectively avoiding the influence of the heat generated during the operation of the speaker module and the PCB board on the sound output; the medium-density fiber layer can effectively reduce resonance and sound coloring, and the sound-absorbing layer can reduce mid-frequency standing waves and high-frequency reflection, thereby improving the sound clarity.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0039] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A high-fidelity Bluetooth speaker, characterized in that: include: A box, a speaker module and a PCB board, wherein the speaker module and the PCB board are both arranged inside the box, and the PCB board is electrically connected to the speaker module, so that the speaker module can be connected to an external device via Bluetooth through the PCB board; The box body includes a mounting cavity and two sound cavities, the two sound cavities are arranged at two ends of the mounting cavity, the PCB board is installed in the mounting cavity, and the speaker modules are respectively arranged in the two sound cavities, so that speaker structures are formed at two ends of the box body; The box body is configured as an aluminum alloy frame, and each of the sound cavities is provided with a medium-density fiber layer, a sound-absorbing layer and a mesh cover, the mesh cover is provided at the open end of the sound cavity, the medium-density fiber layer covers the inner wall surface of the sound cavity, and the sound-absorbing layer covers the surface of one side of the medium-density fiber layer facing away from the inner wall of the sound cavity; The speaker module includes two speaker units, which are respectively installed in the two sound cavities. Each speaker unit is arranged at an opening corresponding to the end of the sound cavity, and the speaker unit is arranged toward the mesh cover, which can effectively protect the speaker unit.

2. The high-fidelity Bluetooth speaker according to claim 1, characterized in that: Each of the sound cavities is also provided with an annular supporting structure, the inner surface of the supporting structure is cooperatively connected to the corresponding speaker unit, and the outer surface of the supporting structure is cooperatively connected to the inner wall of the end of the sound cavity, so that each of the speaker units can be stably installed in the sound cavity through the corresponding supporting structure.

3. The high-fidelity Bluetooth speaker according to claim 2, characterized in that: The medium density fiber layer is made of MDF board and is attached to the corresponding inner wall surface of the sound cavity to form a closed and combined cylindrical medium density fiber layer.

4. The high-fidelity Bluetooth speaker according to claim 3, characterized in that: The thickness of the medium density fiber layer is set to 12 mm.

5. The high-fidelity Bluetooth speaker according to claim 4, characterized in that: The sound-absorbing layer is made of polyester fiber sound-absorbing cotton.

6. The high-fidelity Bluetooth speaker according to claim 5, characterized in that: Each mesh cover is also provided with an acoustic breathable cloth, and the acoustic breathable cloth is attached to a surface of the mesh cover facing the inside of the sound cavity.

7. The high-fidelity Bluetooth speaker according to claim 6, characterized in that: The speaker module further includes two diaphragms, which are respectively arranged in the two sound cavities, and each diaphragm is arranged at one end of the corresponding sound cavity facing the installation cavity, and the diaphragm is arranged toward the corresponding speaker unit.

8. The high-fidelity Bluetooth speaker according to claim 7, characterized in that: The PCB board is provided with a Bluetooth receiving module, a decoding module and a power amplifier module, and the Bluetooth receiving module, the decoding module, the power amplifier module and the speaker module are electrically connected in sequence, so that the Bluetooth receiving module is used for Bluetooth communication of an external device, the decoding module can perform digital-to-analog conversion on the electrical signal received by the Bluetooth receiving module, and then perform power amplification through the power amplifier module, and realize the sound output process in combination with the speaker module.

9. The high-fidelity Bluetooth speaker according to claim 8, characterized in that: The decoding module and the Bluetooth receiving module are connected using a shielded twisted pair cable to reduce interference and shorten the path between the decoding module and the power amplifier module, thereby reducing signal attenuation and interference.

10. The high-fidelity Bluetooth speaker according to claim 9, characterized in that: The output end of the power amplifier module is also provided with a low-pass filter, which uses a 1μH inductor and a 220nF capacitor to filter out high-frequency noise and ensure that the amplified signal has no obvious distortion.

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