Noise reduction device in cabin and vehicle

Abstract

The invention discloses a noise reduction device in a cabin and a vehicle, at least one target position sensor is arranged in the cabin, and the device comprises a microphone assembly arranged on the cabin and used for collecting original noise signals; the sensor assemblies are arranged at the positions of at least one target seat and used for collecting residual noise signals at the corresponding target positions, and the sensor assemblies correspond to the target seats one to one; the controller is connected with the microphone assembly and each sensor assembly, and is used for outputting an electric signal based on the original noise signal and the residual noise signal acquired by the sensor assembly; the loudspeaker assemblies are arranged at the positions of at least one target seat, the loudspeaker assemblies are connected with the controller and used for outputting anti-phase sound waves based on the electric signals, and the loudspeaker assemblies correspond to the target seats in a one-to-one mode. Therefore, the device realizes active noise reduction in the cabin based on the original noise signal and the residual noise signal obtained at the target position, and the riding comfort of passengers in the cabin is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cabin noise reduction, and in particular to a cabin noise reduction device and a vehicle. Background Art

[0002] As vehicles become more intelligent, drivers and passengers have increasingly stringent requirements for the acoustic environment inside the car. In-car noise can reduce the comfort of drivers and passengers, causing irritability and fatigue, affecting the clarity of conversations, and even affecting the driver's perception of external signal sounds, increasing traffic hazards.

[0003] In the related technologies, engine active noise reduction (Environmental Noise Cancellation, ENC) technology and road noise active noise reduction (Road Noise Cancellation, RNC) technology are used to achieve active noise reduction in automobiles. However, these two technical solutions are only used to reduce the low-frequency component noise transmitted to the interior of the vehicle through the vehicle structure path, and the noise reduction effect is not good. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present application is to propose a noise reduction device in the cabin, which can achieve active noise reduction at a target position in the cabin based on an original noise signal and a residual noise signal, thereby improving the riding comfort of passengers in the cabin.

[0005] The second object of the present application is to provide a vehicle.

[0006] To achieve the above-mentioned objectives, the first aspect of the present application proposes an in-cabin noise reduction device, which includes at least one target position sensor in the cabin, and the in-cabin noise reduction device includes: a microphone assembly arranged on the cabin, for collecting an original noise signal; a sensor assembly arranged at at least one target seat, for collecting a residual noise signal at a corresponding target position, and the sensor assembly corresponds to the target seat one-to-one; a controller, the controller is respectively connected to the microphone assembly and each sensor assembly, and is used to output an electrical signal based on the original noise signal and the residual noise signal collected by the sensor assembly; a speaker assembly is arranged at at least one target seat, the speaker assembly is connected to the controller, and is used to output an anti-phase sound wave based on the electrical signal, and the speaker assembly corresponds to the target seat one-to-one.

[0007] According to the cabin noise reduction device of the embodiment of the present application, the original noise signal is collected by a microphone component arranged on the cabin, and the residual noise signal at the corresponding target position is collected by a sensor component arranged at at least one target seat, and the sensor component corresponds to the target seat one by one. The controller outputs an electrical signal based on the original noise signal and the residual noise signal collected by the sensor component; a speaker component is arranged at at least one target seat, and the speaker component is connected to the controller and is used to output an anti-phase sound wave based on the electrical signal, and the speaker component corresponds to the target seat one by one. Therefore, the device realizes noise reduction processing at the target position based on the original noise signal and the residual noise signal at the target position, thereby improving the riding comfort of the passengers in the cabin.

[0008] In addition, the cabin noise reduction device according to the above embodiment of the present application may also have the following additional technical features:

[0009] According to one embodiment of the present application, the sensor assembly and the speaker assembly are integrated in the headrest of the target seat. Precise noise reduction control can be achieved, and the noise reduction effect in the head area can be improved. In addition, the headrest component can be replaced and directly applied to existing seats to reduce hardware costs.

[0010] According to an embodiment of the present application, the speakers in the cabin reuse speaker components to reduce hardware costs.

[0011] According to one embodiment of the present application, the sensor assembly is disposed on the ceiling of the cabin and corresponds to the top of the target seat, thereby reducing hardware costs.

[0012] According to an embodiment of the present application, the microphone assembly includes at least one microphone, and the microphone is arranged inside or outside the cabin to meet the requirements of different application scenarios.

[0013] According to one embodiment of the present application, the sensor assembly includes at least one microphone sensor, and the microphone sensor is arranged inside the headrest of the target seat. The microphone sensor is integrated inside the headrest of the target seat, which can improve the noise reduction accuracy. At the same time, it can be directly applied to the original seat by replacing the headrest, realizing the application of the noise reduction device without damaging the original seat, reducing the application cost and increasing the scope of application.

[0014] According to one embodiment of the present application, the noise reduction device further includes: a switch component disposed at the target seat, the switch component being connected to the controller, and the switch component responding to an on instruction or an off instruction to turn on or off the noise reduction function, so that the user can turn on or off the noise reduction device according to needs, thereby improving the flexibility of use.

[0015] According to one embodiment of the present application, the noise reduction device further includes: a power amplifier, one end of the power amplifier is connected to the controller, and the other end of the power amplifier is connected to the speaker assembly, which is used to amplify the electrical signal to improve the sound quality and volume, and ensure that the electrical signal can be output with high quality and sufficiently loud sound.

[0016] According to one embodiment of the present application, the controller is also used to update the filter coefficients of the noise reduction algorithm according to the original noise signal and the residual noise signal, and output an electrical signal when the residual noise signal meets the preset requirements, thereby meeting different application scenarios and ensuring the noise reduction effect.

[0017] In order to achieve the above-mentioned purpose, a second embodiment of the present application proposes a vehicle, including the above-mentioned in-cabin noise reduction device.

[0018] According to the vehicle of the embodiment of the present application, based on the above-mentioned in-cabin noise reduction device, noise reduction processing is achieved at the target position in the vehicle, thereby improving the riding comfort of the passengers in the vehicle.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the connection of a noise reduction device in a cabin according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the whole vehicle layout of the cabin noise reduction device according to a specific embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the arrangement of target seats according to a specific embodiment of the present application;

[0023] Figure 4 is a principle diagram of an active noise reduction algorithm according to a specific embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the measured effect of ambient sound noise reduction according to a specific embodiment of the present application;

[0025] Figure 6 It is a block diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0027] The following describes the cabin noise reduction device and vehicle proposed in the embodiments of the present application with reference to the accompanying drawings.

[0028] Figure 1 Schematic diagram of the connection of the noise reduction device in the cabin according to an embodiment of the present application.

[0029] In some embodiments of the present application, at least one target position sensor is included in the cabin.

[0030] Among them, the cabin noise reduction device can be used in confined spaces such as vehicles, business first-class cabins on high-speed trains, flying cars, etc., to actively reduce the ambient sound transmitted into the space based on the cabin noise reduction device of the present application. The installation position of the target position sensor can be flexibly set according to the noise reduction requirements of the application scenario, without specific restrictions.

[0031] The following describes the noise reduction device in the cabin in detail by taking its application in a vehicle as an example.

[0032] like Figure 1 As shown, an embodiment of the present application proposes a noise reduction device in a cabin, which includes: a microphone assembly 10 arranged on the cabin, a sensor assembly 20 arranged at at least one target seat, a controller 30 and a speaker assembly 40 arranged at at least one target seat.

[0033] Among them, the microphone assembly 10 is used to collect the original noise signal; the sensor assembly 20 is used to collect the residual noise signal at the corresponding target position, and the sensor assembly 20 corresponds to the target seat one by one; the controller 30 is connected to the microphone assembly 10 and each sensor assembly 20 respectively, and is used to output an electrical signal based on the original noise signal and the residual noise signal collected by the sensor assembly 20; the speaker assembly 40 is connected to the controller 30, and is used to output an anti-phase sound wave based on the electrical signal, and the speaker assembly 40 corresponds to the target seat one by one.

[0034] Specifically, a plurality of microphone assemblies 10 arranged outside or inside the vehicle pick up the ambient sound signal outside the vehicle as the original noise signal. The number and arrangement position of the microphone assemblies 10 are determined according to actual needs, and can be 2, 4, 6, 10, etc., to ensure that the noise propagating into the vehicle from all directions can be effectively picked up. The microphone assembly 10 can be a plurality of microphone sensors, which convert the sound signal into an electrical signal and send it to the controller 30 for noise reduction processing.

[0035] The sensor assembly 20 is disposed at a target position inside the cockpit, and is used to collect the ambient noise transmitted to the target position, so as to convert it into a residual noise signal for output, and be used as a feedback parameter for noise reduction operation. The target position corresponds to the target seat, and is installed at the target noise reduction position in the vehicle. The target seat can be the driver's seat or the passenger seat in the front row, or the middle row of a three-row seat vehicle or the rear row of a five-seat vehicle, etc. The target position corresponds to the position of the target seat.

[0036] The controller 30 is connected to the microphone assembly 10, the sensor assembly 20 and the speaker assembly 40 through lines. The controller 30 outputs an electrical signal according to the original noise signal and the residual noise signal, and uses the principle of acoustic wave superposition and cancellation to drive the speaker assembly 40 to emit sound waves that are real-time and out-of-phase with the noise at the target position, so as to achieve the purpose of actively reducing noise. The speaker assembly 40 can be disposed at the headrest of the target seat to reduce noise in the head area of the target seat. At the same time, the microphone assembly 10, the sensor assembly 20 and the speaker assembly 40 are connected to the controller 30 through lines, which can reduce delay and meet the real-time requirement. The vehicle layout is shown as Figure 2 shown in the figure, where the reference sensor is the microphone assembly 10, the error sensor is the sensor assembly 20, and the noise reduction headrest is the headrest of the target seat integrated with the speaker assembly 40.

[0037] In this embodiment, the original noise signal and the residual noise signal are respectively collected by the microphone assembly 10 and the sensor assembly 20. The controller 30 drives the speaker assembly 40 to generate anti-phase cancellation sound waves based on the original noise signal and the residual noise signal, so as to achieve the superposition and cancellation of the noise sound waves at the target seat and the noise sound waves at the target area, and realize active noise reduction. Thus, this embodiment can achieve active noise reduction for wide-band, random, and noisy road noises. Compared with the structural sound active noise reduction (ENC, RNC) technical solutions adopted in the related art, the noise reduction frequency range of this embodiment can be complementary to it, improving the vehicle noise reduction effect.

[0038] In some embodiments of the present application, the sensor assembly 20 and the speaker assembly 40 are integrally disposed in the headrest of the target seat.

[0039] For example, two sensor assemblies 20 and two speaker assemblies 40 are respectively disposed in the headrest of each target seat, and the specific quantity is not limited. Integrating the sensor assembly 20 and the speaker assembly 40 at the headrest can perform active noise reduction processing by collecting the noise in the head area, realize precise noise reduction control, and improve the noise reduction effect in the head area. In addition, it can also be directly applied to the existing seats by replacing the headrest components, reducing the hardware cost.

[0040] In some embodiments of the present application, the speakers inside the cockpit are multiplexed with the speaker assembly 40.

[0041] That is to say, when the in-cabin noise reduction device is applied to a vehicle, the speaker assembly 40 can be shared with the door bass speaker. For example, a speaker assembly 40 is provided in the headrest of each seat in the vehicle. When there is a need for noise reduction, the speaker assembly 40 can be controlled to emit an anti-phase sound wave, thereby completing active noise reduction based on the principle of sound wave superposition. When there is a need for entertainment, calls, etc., music can be played through the speaker assembly 40, thereby realizing the reuse of the speaker assembly 40 and reducing hardware costs.

[0042] In some embodiments of the present application, the sensor assembly 20 is disposed on the ceiling of the cabin and corresponds to the top of the target seat.

[0043] That is to say, when applied to in-vehicle noise reduction, in order to reduce hardware costs, the sensor assembly 20 can be arranged at a ceiling position corresponding to a target seat in the vehicle to acquire the noise at a position corresponding to the target seat and output a corresponding residual noise signal for noise reduction control.

[0044] In some embodiments of the present application, the microphone assembly 10 includes at least one microphone, and the microphone is disposed inside or outside the cabin.

[0045] Specifically, the microphone is used to collect the original environmental noise signal, that is, the original noise signal, and can be set inside or outside the car. For example, when the microphone is set inside the cabin, the environmental noise transmitted to the car is collected to generate an original noise signal, and the noise at the target seat acquired by the sensor component 20 generates a residual noise signal, that is, active noise reduction processing is performed based on the environmental noise transmitted to the car and the noise at the target seat; when the microphone is set outside the cabin, the noise outside the car is directly collected to output the original noise signal, that is, active noise reduction is performed based on the noise outside the car and the noise at the target seat, which can achieve a better noise reduction effect.

[0046] In some embodiments of the present application, the sensor assembly 20 includes at least one microphone sensor disposed inside a headrest of the target seat.

[0047] Specifically, the microphone sensor should be able to convert the sound signal into an electrical signal for output. The sensor assembly 20 acquires the sound at the target seat through at least one microphone sensor and converts it into an electrical signal to obtain a residual noise signal for noise reduction processing.

[0048] The microphone sensor is integrated inside the headrest of the target seat, which can improve the noise reduction accuracy. At the same time, it can be directly applied to the original seat by replacing the headrest. The application of the noise reduction device can be realized without damaging the original seat, reducing the application cost and increasing the scope of application.

[0049] Combination Figure 3As shown, in some embodiments of the present application, the noise reduction device in the cabin also includes: a switch assembly 50 arranged at the target seat, the switch assembly 50 is connected to the controller 30, and the switch assembly 50 responds to an on instruction or a off instruction to turn on the noise reduction function or turn off the noise reduction function.

[0050] Specifically, the switch assembly 50 can be a mechanical switch or an electronic switch, such as Figure 2 The control switch is not limited to any specific details. Figure 3 For example, the switch assembly 50 is arranged at the armrest of the target seat and is connected to the controller 30 through a wiring harness 70, so that the user can turn on or off the noise reduction device according to needs, thereby improving the flexibility of use.

[0051] In some embodiments of the present application, the noise reduction device in the cabin also includes: a power amplifier 60, one end of the power amplifier 60 is connected to the controller 30, and the other end of the power amplifier 60 is connected to the speaker assembly 40 for amplifying the electrical signal.

[0052] Specifically, Figure 3 For example, the controller 30 and the power amplifier 60 are arranged at the bottom of the target seat and connected to the speaker assembly 40 through the wiring harness 70. The power amplifier 60 amplifies the power of the electrical signal output by the controller 30 to drive the speaker assembly 40 through the amplified electrical signal, thereby improving the sound quality and volume and ensuring that the electrical signal can be output with high quality and sufficiently loud sound.

[0053] In some embodiments of the present application, the controller 30 is further configured to update the filter coefficients of the noise reduction algorithm according to the original noise signal and the residual noise signal, and output an electrical signal when the residual noise signal meets a preset requirement.

[0054] Specifically, the noise reduction algorithm uses the original noise signal picked up and output by the microphone component 10 as a feedforward signal, and adopts a multi-channel normalized filtered minimum mean square error (Filtered-xLeast Mean Square, FxLMS) algorithm to perform noise reduction operations. The key parameters of the noise reduction algorithm, such as the leakage factor and step size, are adjusted according to the noise reduction scenario.

[0055] For example, assuming that the microphone assembly 10 has N reference sensors, the sensor assembly 20 has Q error sensors, and the speaker assembly 40 includes G secondary sound sources, i.e., speakers. Figure 4 As shown, in the discrete time domain, at time n, x I (n) is the environmental noise signal collected by the Ith reference sensor, that is, the original noise signal. The reference sensor can be arranged inside or outside the vehicle. The reference sensor collects the environmental noise signal at the arrangement position and transmits it to the controller 30; dM (n) is the expected signal at the Mth error sensor, that is, the primary signal at the target noise reduction position; P I*M is the primary path from the Ith reference sensor to the Mth error sensor, i.e., the reference noise x I (n) The noise d formed at the Mth target noise reduction position in the vehicle after being transmitted through the vehicle body structure acoustics M The entire acoustic propagation process of (n) is from x I (n) to d M (n) transfer function, but in practice P I*M is unknown; W I*J (n) is the transfer function of the adaptive filter between the Ith reference sensor and the Jth loudspeaker, and its impulse response coefficient is updated in real time by the adaptive algorithm used, thereby realizing active control of noise; y J (n) is the output signal, which is the secondary sound wave signal emitted by the controller 30 through the power amplifier driving the Jth speaker in the headrest; S J*M is the secondary path, which is the transfer function from the Jth speaker in the headrest to the Mth error sensor. This transfer function actually includes the time delay and frequency response caused by the speaker's electro-acoustic conversion and the acoustic transfer function of the sound propagating from the speaker to the error sensor; Y M (n) is the output signal y J (n) Through the secondary path S J*M After transmission, the acoustic signal reaching the Mth error sensor also becomes a secondary signal; e M (n) is the error signal, which is the secondary signal Y M (n) and the primary signal d M (n) the residual error after cancellation, which is actually collected by the Mth error sensor, i.e., the residual noise signal; For the physical secondary path S J*M The estimated secondary path of J*M The system delay and transmission error cannot be ignored and need to be compensated in the system. Obtained by system identification method; r I*J*M (n) is the reference signal x I (n) and estimated secondary paths Filtering refers to the signal used for calculation after convolution.

[0056] The error signal of the in-seat noise reduction device is expressed by the following formula:

[0057] e(n)=d(n)-Y(n)=d(n)-s(n)*y(n)

[0058] Where s(n) is the impulse response of the secondary path S, and * represents the convolution operation.

[0059] The electrical signal output by the controller 30 is expressed as:

[0060]

[0061] Wherein,

[0062]

[0063] In the formula, N is the number of reference signals; L represents the length of the adaptive filter; n represents the sampling time; w i,h (n) is the h-th impulse response coefficient of the adaptive filter corresponding to the I-th reference signal at the n-th time; x i (h - h) is the value of the I-th reference signal at the n - h-th time; w i (n) is the weight coefficient vector of the filter corresponding to the I-th reference signal at the n-th time; x i (n) is the signal of the I-th reference signal at the n-th time; W(n) is the filter weight coefficient matrix composed of all filter weight coefficient vectors at the n-th time; X(n) is the reference signal matrix composed of all reference signal vectors at the n-th time.

[0064] Therefore, if the residual error e(n) is to be minimized, y(n) must be adjusted in real time, and the real-time adjustment of y(n) is achieved by adjusting the filter weight coefficient matrix W(n). Therefore, this noise reduction algorithm finds such a W(n) through an iterative method to minimize the residual error e(n).

[0065] That is to say, during the noise reduction process, the controller 30 updates the filter coefficients of the noise reduction algorithm according to the original noise signal and the residual noise signal to achieve adaptive filter control, and outputs an electrical signal when the residual noise signal meets the preset requirements, for example, when the residual noise signal converges to a preset minimum value, to improve the noise reduction effect.

[0066] In this embodiment, the original noise signal and the residual noise signal are respectively collected through the microphone assembly 10 and the sensor assembly 20 provided on the headrest of the target seat, and the electrical signal output by the controller 30 based on the above noise reduction algorithm drives the secondary sound source inside the headrest, that is, the speaker assembly 40, to generate an anti-phase gain signal to achieve active noise reduction.

[0067] As a specific embodiment of the present application, this in-cabin noise reduction device is applied to a vehicle, such as Figure 2 、 Figure 3 and Figure 4As shown, the noise reduction device in the cabin includes a microphone assembly 10, a sensor assembly 20, a controller 30, a speaker assembly 40, a switch assembly 50 and a power amplifier 60 connected by a harness 70, wherein the microphone assembly 10 is arranged outside the vehicle, and is used to collect the noise outside the vehicle as the original noise signal, and output it to the controller 30 as the calculation input of the noise reduction algorithm. The sensor assembly 20 and the speaker assembly 40 are integrated in the headrest of the target seat, wherein the sensor assembly 20 is used to collect the residual noise signal at the target position, and output it to the controller 30 for feedback calculation of the noise reduction algorithm. The switch assembly 50 is arranged at the armrest of the target seat, and is used to control the opening and closing of the active noise reduction function. The controller 30 and the power amplifier 60 are arranged at the bottom of the target seat, wherein the controller 30 receives the original noise signal and the residual noise signal, runs the active noise reduction algorithm to output the electrical signal, and the power amplifier 60 amplifies the electrical signal, and drives the speaker assembly 40 with the amplified electrical signal to emit an anti-phase sound wave, so as to reduce the noise at the head position of the target seat based on the principle of sound wave superposition.

[0068] This embodiment can improve the low-frequency quietness of the car in a noisy external environment, such as Figure 5 As shown, the green curve is the noise outside the car under the real road environment; the blue curve is the noise inside the car under the same state; it is worth noting that the sound pressure level difference between the green curve and the blue curve can reach 25dB (A), but from the spectrum point of view, the difference mainly comes from the medium and high frequency bands above 300Hz, while the difference in the frequency band below 300Hz is not obvious. This is because the car body itself has sound absorption and sound insulation effects and is effective for high-frequency noise components, but not for low-frequency components. The red curve in the figure is the in-car noise curve of the target position in the car after the noise reduction function of this embodiment is turned on in the same state. By comparing the red curve and the blue curve, it can be seen that the effective frequency band of active noise reduction is a low-frequency band below about 700Hz. Therefore, this technical solution can complement the existing sound absorption and insulation technology of the vehicle and further improve the quietness level in the car. Through the use of the noise reduction device in the cockpit, the in-car sound environment can be improved to the sleep standard of Class 1 environment when the vehicle is in Class 4 road noise environment. In addition to road noise environments, this embodiment can also achieve effective noise reduction when the vehicle is in other noise scenarios, such as noisy construction sites, crowded vegetable markets, noisy commercial underground parking lots, etc., which have broadband and random environmental noise scenarios, and has a wide range of applications.

[0069] In summary, according to the cabin noise reduction device of the embodiment of the present application, the original noise signal is collected by a microphone component arranged on the cabin, and the residual noise signal at the corresponding target position is collected by a sensor component arranged at at least one target seat, the sensor component corresponds to the target seat one-to-one, and the controller outputs an electrical signal based on the original noise signal and the residual noise signal collected by the sensor component; a speaker component is arranged at at least one target seat, the speaker component is connected to the controller, and is used to output an anti-phase sound wave based on the electrical signal, and the speaker component corresponds to the target seat one-to-one. Therefore, the device realizes noise reduction processing at the target position based on the original noise signal and the residual noise signal at the target position, thereby improving the riding comfort of the passengers in the cabin.

[0070] Corresponding to the above embodiments, the present application also proposes a vehicle.

[0071] like Figure 6 As shown, the vehicle 200 according to the embodiment of the present application includes the above-mentioned in-cabin noise reduction device 100.

[0072] According to the vehicle of the embodiment of the present application, based on the above-mentioned in-cabin noise reduction device, noise reduction processing is achieved at the target position in the vehicle, thereby improving the riding comfort of the passengers in the vehicle.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A noise reduction device in a cabin, characterized in that: The cabin includes at least one target position sensor, and the device includes: A microphone assembly disposed on the cockpit, for collecting original noise signals; A sensor assembly disposed at at least one target seat, for collecting a residual noise signal at a corresponding target position, wherein the sensor assembly corresponds to the target seat one by one; A controller, the controller being connected to the microphone assembly and each of the sensor assemblies, respectively, and configured to output an electrical signal based on the original noise signal and the residual noise signal collected by the sensor assembly; A speaker assembly is arranged at at least one target seat, the speaker assembly is connected to the controller and is used to output an anti-phase sound wave based on the electrical signal, and the speaker assembly corresponds to the target seat one by one.

2. The cabin noise reduction device according to claim 1, characterized in that: The sensor assembly and the speaker assembly are integrated and arranged in a headrest of the target seat.

3. The cabin noise reduction device according to claim 2, characterized in that: The in-cabin speaker reuses the speaker assembly.

4. The cabin noise reduction device according to claim 1, characterized in that: The sensor assembly is arranged at a ceiling position of the cabin and corresponds to the top of the target seat.

5. The cabin noise reduction device according to claim 1, characterized in that: The microphone assembly includes at least one microphone, and the microphone is arranged inside or outside the cabin.

6. The cabin noise reduction device according to claim 1, characterized in that: The sensor assembly includes at least one microphone sensor disposed inside a headrest of the target seat.

7. The cabin noise reduction device according to claim 1, characterized in that: The noise reduction device further comprises: A switch component is arranged at the target seat, the switch component is connected to the controller, and the switch component responds to an on instruction or a off instruction to turn on or off the noise reduction function.

8. The cabin noise reduction device according to claim 1, characterized in that: The noise reduction device further comprises: A power amplifier, one end of which is connected to the controller, and the other end of which is connected to the speaker assembly, is used to amplify the electrical signal.

9. The cabin noise reduction device according to any one of claims 1 to 8, characterized in that: The controller is also used to update the filter coefficients of the noise reduction algorithm according to the original noise signal and the residual noise signal, and output the electrical signal when the residual noise signal meets a preset requirement.

10. A vehicle, characterized in that: The invention comprises a cabin noise reduction device as claimed in any one of claims 1 to 9.

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