Portable car audio system noise reducer

Abstract

The utility model discloses a portable vehicle-mounted sound box noise reducer, including shell, sucking disc, first microphone, second microphone, noise reduction mainboard, sucking disc sets up at the back of shell is used for with shell detachably adsorbed fixed in the inside of vehicle glass, first microphone is installed in shell and picks up the sound surface to the glass outside, second microphone is installed in shell and picks up the sound surface to the car, and noise reduction mainboard is encapsulated in shell and is connected with the sound box system communication of vehicle, and noise reduction mainboard is electrically connected with first microphone and second microphone respectively, is used for processing two way noise signal and is exported to the sound box system of vehicle plays reverse sound wave signal. The ANC function is integrated with the sucking disc of repeatable pasting, and the active noise reduction system originally needing front-mounted multichannel wiring is converted into the rear assembly spare of plug and play, solves the industry pain point of old car NVH degradation, the big upgrading cost.

Description

Technical Field

[0001] This utility model relates to the field of passenger vehicle accessories technology, and in particular to a portable vehicle speaker noise reduction device. Background Technology

[0002] As people's quality of life improves, their purchasing power for cars is increasing, and they are driving more and more frequently.

[0003] The NVH (noise, vibration, and harshness) experience of automobiles has become a major selling point, prompting automakers to continuously optimize the NVH experience. With the explosive growth of new energy vehicles, their performance and comfort are improving. However, my country still has a large number of older gasoline-powered vehicles, and their NVH deteriorates significantly with age. Therefore, how to improve NVH without major modifications to vehicle components, thus revitalizing older vehicles, remains a challenging problem for industry professionals. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a portable car speaker noise reduction device that can optimize the NVH performance of automobiles.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a portable car speaker noise reduction device, comprising: case; A suction cup is provided on the back of the housing for detachably adsorbing and fixing the housing to the inside of the vehicle glass; The first microphone is installed in the housing with its pickup surface facing the outside of the glass, and is used to collect reference noise from outside the vehicle; The second microphone is installed in the housing with its pickup surface facing the inside of the vehicle, and is used to collect error noise inside the vehicle; The noise reduction motherboard is encapsulated within the housing and communicates with the vehicle's audio system. The noise reduction motherboard is electrically connected to the first microphone and the second microphone, respectively, and is used to process the two noise signals and output the reverse sound wave signal to the vehicle's audio system for playback, so as to create a noise reduction field inside the vehicle.

[0006] Furthermore, the back of the housing is provided with a first pickup port, and the first microphone is embedded in the first pickup port. The pickup surface of the first microphone is flush with the back of the housing, or concave relative to the back of the housing.

[0007] Furthermore, the suction cup is generally cone-shaped, and the first pickup port is located at the center of the suction cup.

[0008] Furthermore, a second microphone is provided on the front of the housing, and the second microphone is provided corresponding to the second microphone.

[0009] Furthermore, the first microphone and the second microphone are respectively fixed on opposite sides of the noise reduction motherboard and are staggered.

[0010] Furthermore, a battery is provided inside the housing, and the battery is electrically connected to the noise reduction motherboard.

[0011] Furthermore, a limiting frame is fixed on the noise reduction motherboard, and the battery is at least partially located within the limiting frame.

[0012] Furthermore, the housing includes a connected bottom shell and a cover plate, the cover plate being located at the opening of the bottom shell and abutting against the battery.

[0013] Furthermore, the housing is provided with a window, and the noise reduction motherboard has an electrical interface corresponding to the window.

[0014] Furthermore, the noise reduction motherboard is equipped with a wireless transmission module for wireless communication with the vehicle's audio system.

[0015] The beneficial effects of this utility model are as follows: It integrates the ANC function with a reusable suction cup. The first microphone is attached to the glass to collect external noise, and the second microphone picks up residual noise inside the vehicle. The noise reduction mainboard generates a reverse sound wave and directly calls the original car speaker to play it, forming a closed-loop cancellation. Thus, without disassembly, modification, or additional hardware, the active noise reduction system that originally required pre-installed multi-channel wiring is transformed into a plug-and-play aftermarket accessory. This allows for low-cost and short-time improvement of NVH performance in older vehicles, solving the industry pain point of NVH degradation in older vehicles and high upgrade costs. Attached Figure Description

[0016] Figure 1 A schematic diagram illustrating the interaction between a portable car speaker noise reducer and glass. Figure 2 A schematic diagram of the overall structure of a portable car speaker noise reduction device. Figure 1 ; Figure 3 A schematic diagram of the overall structure of a portable car speaker noise reduction device. Figure 2 ; Figure 4 A cross-sectional view of a portable car speaker noise reduction device; Figure 5 This is a schematic diagram of part of the structure of a portable car speaker noise reduction device.

[0017] Label Explanation: 10. Portable car speaker noise reduction device; 1. Housing; 11. First pickup port; 12. Second pickup port; 13. Bottom shell; 14. Cover plate; 15. Window; 2. Suction cup; 3. First microphone; 4. Second microphone; 5. Noise reduction main board; 6. Battery; 7. Limiting frame; 8. Electrical interface; 20. Glass. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figures 1 to 5 A portable car speaker noise reduction device 10 includes a housing 1, a suction cup 2, a first microphone 3, a second microphone 4, and a noise reduction main board 5. The suction cup 2 is disposed on the back of the housing 1 and is used to detachably attach the housing 1 to the inside of the vehicle glass 20. The first microphone 3 is installed on the housing 1 with its pickup surface facing the outside of the glass 20 and is used to collect external reference noise. The second microphone 4 is installed on the housing 1 with its pickup surface facing the inside of the vehicle and is used to collect internal error noise. The noise reduction main board 5 is encapsulated in the housing 1 and is communicatively connected to the vehicle's speaker system. The noise reduction main board 5 is electrically connected to the first microphone 3 and the second microphone 4 respectively and is used to process the two noise signals and output a reverse sound wave signal to the vehicle's speaker system for playback, so as to form a noise reduction field inside the vehicle.

[0020] As can be seen from the above description, the beneficial effects of this utility model are as follows: the ANC function is integrated with the reusable suction cup 2, the first microphone 3 is attached to the glass 20 to collect external noise, the second microphone 4 picks up residual noise inside the vehicle, and the noise reduction motherboard 5 generates a reverse sound wave and directly calls the original car speaker to play it, forming a closed loop cancellation; thus, without disassembly, modification, or additional hardware, the original active noise reduction system that required pre-installed multi-channel wiring is transformed into a plug-and-play aftermarket accessory, which improves the NVH performance of old vehicles with low cost and short time, solving the industry pain point of NVH degradation and high upgrade costs in old vehicles.

[0021] Furthermore, the back of the housing 1 is provided with a first pickup port 11, and the first microphone 3 is embedded in the first pickup port 11. The pickup surface of the first microphone 3 is flush with the back of the housing 1, or concave relative to the back of the housing 1.

[0022] As can be seen from the above description, making the pickup surface of the first microphone 3 flush with or concave to the back of the housing 1 can prevent the first microphone 3 from being squeezed, deformed or blocked when it is attached to the glass 20, thus ensuring the pickup effect of the external reference noise and maintaining the accuracy of the reverse sound wave calculation.

[0023] Furthermore, the suction cup 2 is generally cone-shaped, and the first pickup port 11 is located at the center of the suction cup 2.

[0024] As described above, placing the first pickup port 11 at the center of the cone-shaped suction cup 2 creates an effect similar to an acoustic waveguide within the suction cup 2. This not only fixes the constant distance between the first microphone 3 and the glass 20, but also uses the peripheral wall of the suction cup 2 to block lateral interference sound, thereby improving the signal-to-noise ratio of the reference signal.

[0025] Furthermore, the front of the housing 1 is provided with a second pickup port 12, and the second microphone 4 is provided corresponding to the second pickup port 12.

[0026] As described above, by opening an independent second pickup port 12 on the front of the housing 1, allowing the second microphone 4 to face the seating area directly, the phase distortion caused by internal reflections of the housing 1 can be reduced, making the residual noise sampling closer to the true value of the human ear and improving the closed-loop cancellation accuracy.

[0027] Furthermore, the first microphone 3 and the second microphone 4 are respectively fixed on opposite sides of the noise reduction motherboard 5 and are staggered.

[0028] As can be seen from the above description, placing the first microphone 3 and the second microphone 4 on opposite sides of the noise reduction motherboard 5 and offsetting them can improve acoustic isolation, reduce crosstalk between the two signals, and prevent the algorithm from failing to converge due to autocorrelation.

[0029] Furthermore, a storage battery 6 is provided inside the housing 1, and the storage battery 6 is electrically connected to the noise reduction motherboard 5.

[0030] As described above, the built-in battery 6 enables the car speaker noise reducer to work continuously even when disconnected from the car cigarette lighter, solving the problem of insufficient interfaces in some older models or power outages after temporary parking and engine shutdown, ensuring that the noise reduction function is ready to use immediately and without power interruption.

[0031] Furthermore, a limiting frame 7 is fixed on the noise reduction motherboard 5, and the battery 6 is at least partially located in the limiting frame 7.

[0032] As described above, the limit frame 7 can suppress the shaking of the battery 6 caused by vehicle vibration and avoid reverse signal interruption and popping noise caused by instantaneous power failure.

[0033] Furthermore, the housing 1 includes a connected bottom shell 13 and a cover plate 14, the cover plate 14 being located at the opening of the bottom shell 13 and abutting against the battery 6.

[0034] As described above, the cover plate 14 directly contacts the top surface of the battery 6, forming a sandwich structure, so that the cover plate 14, the battery, and the noise reduction mainboard 5 support each other, thereby improving the overall vibration resistance.

[0035] Furthermore, the housing 1 is provided with a window 15, and the noise reduction motherboard 5 has an electrical interface 8 corresponding to the window 15.

[0036] As described above, the electrical interface 8 can be used to charge the battery 6 or to input a reverse sound wave signal to the vehicle's audio system via a wired connection.

[0037] Furthermore, the noise reduction motherboard 5 is equipped with a wireless transmission module for wireless communication with the vehicle's audio system.

[0038] As described above, pairing a wireless transmission module (Bluetooth / Wi-Fi, etc.) with the vehicle's speaker system can eliminate the need for dragging audio cables, remove the mess caused by long cables, keep the cabin tidy, and expand the range of installation locations for car speaker noise reduction devices.

[0039] Please refer to Figures 1 to 5 One embodiment of this utility model is a portable vehicle speaker noise reduction device 10, which can be installed inside a vehicle, such as on the glass 20, to improve the NVH experience of people inside the vehicle, especially those who are close to the portable vehicle speaker noise reduction device 10.

[0040] The portable car speaker noise reduction device 10 includes a housing 1, a suction cup 2, a first microphone 3, a second microphone 4, and a noise reduction main board 5. The suction cup 2 is disposed on the back of the housing 1 and is used to detachably attach the housing 1 to the inside of the vehicle glass 20. The first microphone 3 is installed on the housing 1 with its pickup surface facing the outside of the glass 20 and is used to collect external reference noise. The second microphone 4 is installed on the housing 1 with its pickup surface facing the inside of the vehicle and is used to collect internal error noise. The noise reduction main board 5 is encapsulated in the housing 1 and is communicatively connected to the vehicle's speaker system. The noise reduction main board 5 is electrically connected to the first microphone 3 and the second microphone 4 respectively and is used to process the two noise signals and output a reverse sound wave signal to the vehicle's speaker system for playback, so as to form a noise reduction field inside the vehicle. The noise reduction main board 5 is a PCB board with an active noise reduction circuit.

[0041] From another perspective, the portable car speaker noise canceller 10 in this embodiment is essentially a hybrid ANC active noise cancellation device. The specific structure and principle of hybrid ANC active noise cancellation technology are common technologies in the field of electroacoustic converter technology, and will not be elaborated here.

[0042] In this embodiment, the back of the housing 1 is provided with a first pickup port 11, and the first microphone 3 is embedded in the first pickup port 11. The pickup surface of the first microphone 3 is concave relative to the back of the housing 1. In other embodiments, the pickup surface of the first microphone 3 is flush with the back of the housing 1, or even convex relative to the back of the housing 1. The specific configuration can be set as needed.

[0043] The suction cup 2 is generally cone-shaped. The material of the suction cup 2 can be rubber or the like. Preferably, the first pickup port 11 is located at the center of the suction cup 2. Of course, it is also acceptable for the first pickup port 11 to be located on the outside of the suction cup 2.

[0044] The front of the housing 1 is provided with a second pickup port 12, and the second microphone 4 is provided corresponding to the second pickup port 12.

[0045] To improve the noise reduction effect, the first microphone 3 and the second microphone 4 are respectively fixed on opposite sides of the noise reduction motherboard 5 and are staggered.

[0046] The housing 1 contains a storage battery 6, which is electrically connected to the noise reduction motherboard 5.

[0047] Optionally, a limiting frame 7 is fixed on the noise reduction motherboard 5, and the battery 6 is at least partially located in the limiting frame 7.

[0048] In this embodiment, the housing 1 includes a bottom shell 13 and a cover plate 14 connected together. The first pickup port 11 is disposed on the bottom shell 13, and the second pickup port 12 is disposed on the cover plate 14. In order to improve the structural stability of the portable vehicle speaker noise reduction device 10, it is preferable that the cover plate 14 is located at the opening of the bottom shell 13 and abuts against the battery 6.

[0049] The housing 1 has a window 15, and the noise-canceling mainboard 5 has an electrical interface 8 corresponding to the window 15. The electrical interface 8 includes, but is not limited to, a Telephone-C interface. Users can charge the battery 6 through the electrical interface 8, or input a reverse sound wave signal to the vehicle's audio system via an audio cable through the electrical interface 8. However, as a preferred embodiment, the noise-canceling mainboard 5 is equipped with a wireless transmission module for wireless communication with the vehicle's audio system. The wireless transmission module includes, but is not limited to, a Bluetooth module, a Wi-Fi module, etc.

[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A portable car speaker noise reduction device, characterized in that, include case; A suction cup is provided on the back of the housing for detachably adsorbing and fixing the housing to the inside of the vehicle glass; The first microphone is installed in the housing with its pickup surface facing the outside of the glass, and is used to collect reference noise from outside the vehicle; The second microphone is installed in the housing with its pickup surface facing the inside of the vehicle, and is used to collect error noise inside the vehicle; The noise reduction motherboard is encapsulated within the housing and communicates with the vehicle's audio system. The noise reduction motherboard is electrically connected to the first microphone and the second microphone, respectively, and is used to process the two noise signals and output the reverse sound wave signal to the vehicle's audio system for playback, so as to create a noise reduction field inside the vehicle.

2. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The back of the housing is provided with a first pickup port, and the first microphone is embedded in the first pickup port. The pickup surface of the first microphone is flush with the back of the housing, or concave relative to the back of the housing.

3. The portable vehicle speaker noise reduction device according to claim 2, characterized in that, The suction cup is cone-shaped, and the first pickup port is located at the center of the suction cup.

4. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The front of the housing is provided with a second microphone port, and the second microphone is provided corresponding to the second microphone port.

5. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The first microphone and the second microphone are respectively fixed on opposite sides of the noise reduction motherboard and are staggered.

6. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The housing contains a battery, which is electrically connected to the noise reduction motherboard.

7. The portable vehicle speaker noise reduction device according to claim 6, characterized in that, A limiting frame is fixed on the noise reduction motherboard, and the battery is at least partially located within the limiting frame.

8. The portable vehicle speaker noise reduction device according to claim 6, characterized in that, The housing includes a connected bottom shell and a cover plate, the cover plate being located at the opening of the bottom shell and abutting against the battery.

9. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The housing has a window, and the noise reduction motherboard has an electrical interface corresponding to the window.

10. The portable vehicle speaker noise reduction device according to claim 1, characterized in that, The noise reduction motherboard is equipped with a wireless transmission module for wireless communication with the vehicle's audio system.

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