Active road noise reduction method and system, vehicle, medium and product

Abstract

The invention discloses a road noise active noise reduction method and system, a vehicle, a medium and a product, and relates to the technical field of road noise active noise reduction. The disclosed road noise active noise reduction method comprises the following steps: acquiring a current seat state and a vibration signal; acquiring a transfer function and a secondary path in the current seat state; and calculating a noise reduction signal according to the transfer function, the secondary path and the vibration signal in the current seat state, and controlling a loudspeaker to emit a corresponding noise reduction sound wave according to the noise reduction signal. According to the method, calculation of an active noise reduction algorithm can be carried out without arranging an error microphone in a cabin; by acquiring the transfer function from the sensor arrangement point to the microphone, a mute area can be directly formed in the human ear area, and the problem that the noise reduction effect is easily affected due to the fact that the microphone is fixed in installation position is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of active road noise reduction, and in particular to a method, system, vehicle, medium and product for active road noise reduction. Background Art

[0002] In the context of the rapid development of new energy vehicles, lightweighting of the vehicle body, as a key strategy to improve endurance and energy efficiency, has inevitably led to the problem of weakened vehicle body rigidity and increased noise sensitivity inside the vehicle. At the same time, without the masking effect of engine noise, the road noise problem of new energy vehicles has become increasingly prominent, which has a direct impact on the passengers' riding experience. At present, it is difficult to meet the demand for cabin quietness by simply adding sound insulation materials and optimizing the vehicle body structure. Therefore, active road noise reduction technology, as a new solution, can effectively reduce the road noise level and improve ride comfort without changing the overall structure of the current vehicle body.

[0003] Conventional road noise active noise reduction systems mainly include controllers, sensors, microphones, and speakers. The purpose of the road noise active noise reduction system is to form a quiet zone in the human ear area, but the noise reduction area formed by the noise reduction system is near the microphone, so the microphone is required to be arranged as close to the human ear as possible. When the microphone is too far away from the human ear, the noise reduction effect in the human ear area is significantly worse than that near the microphone, and it may even be impossible to hear the noise reduction effect. Relevant studies have shown that at 1 / 10 wavelength away from the microphone, the noise sound pressure is reduced by 10dB. Therefore, the distance between the microphone arrangement position and the human ear should be as small as possible from the 1 / 10 wavelength distance corresponding to the noise reduction frequency (taking 200Hz noise reduction as an example, 1 / 10 wavelength is 17cm). However, in the actual vehicle development process, it is difficult to find an ideal microphone arrangement position on the ceiling, pillars, etc. due to the constraints of the interior space and shape. Therefore, some R&D personnel choose to place microphones in the seat headrest, seat back shoulder and other locations, which has a significantly better noise reduction effect than the ceiling. However, there are also limitations to installing microphones on seats. On the one hand, microphones that are close to the human ear are easily blocked by the occupant's head, body and other parts, affecting the noise reduction effect; on the other hand, in the noise reduction system, the secondary path between the speaker and the error sensor (microphone) needs to be identified in advance for the calculation of the noise reduction algorithm. When the microphone is placed on the seat, the secondary path will change due to the adjustment of the seat's fore and aft travel and the seat back angle, which will also have a greater impact on the noise reduction effect. Summary of the invention

[0004] The main purpose of the present invention is to propose a method for active noise reduction of road noise, aiming to solve the problem that the existing method for active noise reduction of road noise requires the arrangement of microphones in the cockpit to calculate the active noise reduction algorithm, and the fixed installation position of the microphone leads to the noise reduction effect being easily affected by factors such as the fore and aft travel of the seat, the seat back angle and the obstruction by the body parts of the occupants.

[0005] To achieve the above object, the present invention proposes a method for active road noise reduction, the method comprising:

[0006] Get the current seat status and vibration signal;

[0007] Obtain the transfer function and secondary path under the current seat state;

[0008] A noise reduction signal is calculated according to the transfer function, the secondary path and the vibration signal in the current seat state, and the speaker is controlled to emit a corresponding noise reduction wave according to the noise reduction signal.

[0009] Optionally, the step of obtaining the transfer function and the secondary path in the current seat state includes:

[0010] Measure the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states;

[0011] measuring the secondary path from the loudspeaker to the microphone arrangement point under different seat states;

[0012] establishing a database based on the transfer functions and the secondary paths;

[0013] The transfer function and the secondary path under the current seat state are queried through the database.

[0014] Optionally, the step of measuring the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states specifically includes:

[0015] The vibration signal of the road surface under different seat conditions is measured by sensors;

[0016] The sound pressure signal of the human ear area under different seat conditions is measured by a microphone;

[0017] The transfer function from the sensor arrangement point to the microphone arrangement point under different seat states is calculated according to the vibration signal and the sound pressure signal.

[0018] Optionally, the step of measuring the secondary path from the loudspeaker to the microphone arrangement point under different seat states specifically includes:

[0019] The control speaker emits the first signal in different seat states;

[0020] Acquire a second acoustic signal transmitted from the first acoustic signal to the microphone through a real secondary path;

[0021] Acquire a third sound signal obtained by filtering the first sound signal;

[0022] The secondary paths from the loudspeaker to the human ear coordinates under different seat states are calculated according to the first sound signal, the second sound signal and the third sound signal.

[0023] Optionally, the step of calculating the noise reduction signal according to the transfer function, the secondary path and the vibration signal in the current seat state specifically includes:

[0024] Get filter weight coefficients;

[0025] Generate a noise reduction signal according to the vibration signal, the secondary path in the current seat state and the filter weight coefficient, and control the speaker to emit a corresponding noise reduction wave according to the noise reduction signal;

[0026] The weight coefficients are updated according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state, and the process returns to the step of obtaining the filter weight coefficients.

[0027] Optionally, the step of updating the weight coefficient according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state specifically includes:

[0028] Calculate the sound pressure signal in the human ear area according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state;

[0029] The weight coefficients are updated according to the sound pressure signal, secondary path and vibration signal in the human ear area.

[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a road noise active noise reduction system, and the road noise active noise reduction method includes: a controller, a sensor and a speaker;

[0031] The controller is used to receive the vibration signal output by the sensor and calculate the noise reduction signal according to the vibration signal, and is also used to transmit the noise reduction signal to the speaker;

[0032] The sensor is used to collect vibration signals from the road surface and transmit the vibration signals to the controller;

[0033] The speaker is used to receive the noise reduction signal output by the controller and output a noise reduction wave according to the noise reduction signal.

[0034] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle, which can implement the steps of the road noise active noise reduction method described above.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the road noise active noise reduction method as described above are implemented.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the road noise active noise reduction method as described above are implemented.

[0037] The present application discloses a method, system, vehicle, medium and product for active noise reduction of road noise, and relates to the technical field of active noise reduction of road noise; the disclosed method for active noise reduction of road noise includes: obtaining the current seat state and vibration signal; obtaining the transfer function and secondary path under the current seat state; calculating the noise reduction signal according to the transfer function, secondary path and vibration signal under the current seat state, and controlling the speaker to emit the corresponding noise reduction wave according to the noise reduction signal. The present application can realize the calculation of the active noise reduction algorithm without arranging an error microphone in the cockpit through the above method; by obtaining the transfer function from the sensor arrangement point to the microphone, a quiet zone can be directly formed in the human ear area, avoiding the problem that the noise reduction effect is easily affected due to the fixed installation position of the microphone. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 This is a flowchart of the first embodiment of the road noise active noise reduction method of the present application;

[0040] Figure 2 This is a flow chart of a second embodiment of the road noise active noise reduction method of the present application;

[0041] Figure 3 This is a flowchart of a third embodiment of the road noise active noise reduction method of the present application;

[0042] Figure 4 This is a flowchart of a fourth embodiment of the road noise active noise reduction method of the present application;

[0043] Figure 5 This is a flowchart of a fifth embodiment of the road noise active noise reduction method of the present application;

[0044] Figure 6 Calculation block diagram for noise reduction signal;

[0045] Figure 7 This is a schematic diagram of the structure of the road noise active noise reduction system.

[0046] Description of Figure Numbers:

[0047] 1. Controller; 2. Sensor; 3. Speaker. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] The present application embodiment provides a method for active noise reduction of road noise, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the road noise active noise reduction method of the present application.

[0052] In this embodiment, the road noise active noise reduction method includes steps S10 to S40;

[0053] S10: Acquire current seat status and vibration signal;

[0054] S20: Acquire the transfer function and secondary path in the current seat state;

[0055] S30: Calculating a noise reduction signal according to the transfer function, the secondary path and the vibration signal in the current seat state, and controlling the speaker to emit a corresponding noise reduction wave according to the noise reduction signal.

[0056] It can be understood that the seat state includes the seat travel and the seat angle.

[0057] It can be understood that the vibration signal refers to the vibration signal of the road surface collected by the sensor.

[0058] It can be understood that the transfer function refers to the ratio of the sound pressure signal in the human ear area to the vibration signal collected by the sensor.

[0059] It can be understood that the secondary path refers to the transmission path from the speaker that emits noise reduction waves to the human ear area.

[0060] It should be noted that the speaker may be an electrodynamic speaker, an electromagnetic speaker, a piezoelectric speaker, or an electrostatic speaker, which is not limited in this embodiment.

[0061] In specific implementation, the current seat state and vibration signal are obtained; the transfer function and secondary path under the current seat state are obtained; the noise reduction signal is calculated based on the transfer function, secondary path and vibration signal under the current seat state; and the speaker is controlled to emit a corresponding noise reduction wave according to the noise reduction signal.

[0062] The present embodiment can realize the calculation of the active noise reduction algorithm through the above method without arranging an error microphone in the cockpit; on the one hand, it can reduce the hardware cost of the road noise active noise reduction system; on the other hand, by obtaining the transfer function from the sensor arrangement point to the microphone, a quiet zone can be directly formed in the human ear area, avoiding the problem that the noise reduction effect is easily affected by the fixed installation position of the microphone.

[0063] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the first embodiment can refer to the above introduction, and will not be repeated in the following. Figure 2 , Figure 2 This is a flow chart of the second embodiment of the road noise active noise reduction method of the present application.

[0064] In this embodiment, the step S20 includes S210 to S240;

[0065] S210: measuring the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states;

[0066] S220: measuring a secondary path from the loudspeaker to the microphone arrangement point under different seat states;

[0067] S230: Establishing a database according to the transfer function and the secondary path;

[0068] S240: Query the transfer function and the secondary path in the current seat state through the database.

[0069] It should be noted that the microphone may be a pressure microphone, a pressure differential microphone, or a pressure-pressure differential combined microphone, which is not limited in this embodiment.

[0070] It can be understood that the sensor arrangement point can be selected from the arrangement point combination with the largest coherence coefficient with the in-vehicle noise.

[0071] It should be noted that the number and positions of the sensors can be selected according to actual needs, and this embodiment does not impose any restrictions on this.

[0072] It can be understood that the arrangement point combination with the maximum coherence coefficient with the vehicle interior noise can be obtained by, for example, performing a road noise test on the vehicle on different road surfaces and then performing multiple coherence analysis.

[0073] It can be understood that the microphone arrangement point is located in the human ear area, and the microphone is used to collect the sound pressure signal in the human ear area.

[0074] It can be understood that different seat states correspond to different transfer functions and secondary pathways. This embodiment measures the transfer functions and secondary pathways corresponding to different seat states and establishes a database based on the transfer functions and secondary pathways, so as to facilitate the subsequent acquisition of the transfer function and secondary pathway in the current seat state based on the current seat state without repeated measurements. Moreover, through this method, after the database is established, the microphone can be taken out. At this time, the sound pressure signal in the human ear area can be calculated based on the transfer function and vibration signal in the current seat state. On the one hand, the microphone is eliminated, which can reduce the hardware cost of the road noise active noise reduction system. On the other hand, a quiet zone can be formed directly in the human ear area, avoiding the problem that the noise reduction effect of the microphone is easily affected due to the fixed installation position.

[0075] Based on the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the second embodiment can be referred to the above introduction, and will not be repeated in the following. Figure 3 , Figure 3 This is a flow chart of a third embodiment of the road noise active noise reduction method of the present application.

[0076] In this embodiment, the step S210 includes steps S211 to S213;

[0077] S211: measuring vibration signals of the road surface under different seat states through a sensor;

[0078] S212: measuring the sound pressure signal of the human ear area in different seat states by means of a microphone;

[0079] S213: Calculate the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states according to the vibration signal and the sound pressure signal.

[0080] It can be understood that if the vibration signal of the road surface collected by the sensor is x(n), and the sound pressure signal collected by the microphone in the human ear area is e(n), then:

[0081] P(z)=e(n) / x(n);

[0082] Where P(z) is the transfer function from the sensor placement point to the microphone placement point.

[0083] It can be understood that the transfer function includes the relationship between the vibration signal of the road surface, the sound pressure signal in the human ear area and the seat state. When the transfer function and vibration signal in the current seat state are determined, the sound pressure signal in the human ear area when the vibration signal is not collected through the microphone is not required. This can reduce the hardware cost of the road noise active noise reduction system on the one hand, and on the other hand, a quiet zone can be directly formed in the human ear area, avoiding the problem that the noise reduction effect of the microphone is easily affected due to the fixed installation position.

[0084] In specific implementation, the vibration signal of the road surface under different seat states is measured by a sensor; the sound pressure signal of the human ear area under different seat states is measured by a microphone; and the transfer function from the sensor layout point to the microphone layout point under different seat states is calculated based on the vibration signal and the sound pressure signal.

[0085] Based on the third embodiment of the present application, in the fourth embodiment of the present application, the same or similar contents as those in the third embodiment can refer to the above description, and will not be repeated in the following. Figure 4 , Figure 4 This is a flow chart of a fourth embodiment of the road noise active noise reduction method of the present application.

[0086] In this embodiment, step S220 includes steps S221 to S224:

[0087] S221: Control the speaker to emit a first sound signal in different seat states;

[0088] S222: Acquire a second acoustic signal transmitted from the first acoustic signal to the microphone through the real secondary path;

[0089] S223: Obtain a third sound signal obtained by filtering the first sound signal;

[0090] S224: Calculate the secondary path from the speaker to the human ear coordinates in different seat states according to the first sound signal, the second sound signal and the third sound signal.

[0091] It should be noted that the acoustic signal may be pure tone, narrowband noise, broadband noise, white noise, or pink noise, which is not limited in this embodiment.

[0092] In this embodiment, the first sound signal is white noise.

[0093] It is understandable that the secondary path cannot be directly obtained under normal circumstances. Suppose the first sound signal emitted by the speaker is u(n), the real secondary path is S(z), the second sound signal is z(n), and the third sound signal is z'(n); then:

[0094] e(n)=z(n)-z'(n);

[0095] S(n+1)=S(n)+μe(n)u(n);

[0096] Where e(n) is the sound pressure signal collected by the microphone in the human ear area, and μ is the iteration step size, which is usually given by actual vehicle calibration. Through repeated iterations, e(n) is controlled within the set error range (in the most ideal case, e(n) = 0). The estimate closest to the actual secondary path can be obtained

[0097] It can be understood that the secondary path reflects the relationship between the noise reduction signal and the vibration signal. When the transfer function and vibration signal under the current seat state are determined, the noise reduction signal can be directly generated according to the vibration signal, and the speaker can be controlled to generate noise reduction noise waves according to the noise reduction signal. At this time, the effect of the noise reduction noise waves may not reach the optimal value. The sound pressure signal in the human ear area can be calculated according to the transfer function, secondary path and vibration signal under the seat state. The relationship between the noise reduction signal and the vibration signal can be further iterated according to the value of the sound pressure signal and the noise reduction signal, so that the noise reduction effect can achieve the effect of real-time optimal noise reduction signal output, which is conducive to improving user experience.

[0098] In specific implementation, the speaker is controlled to emit a first sound signal under different seat states; a second sound signal is obtained by transmitting the first sound signal to the microphone through a real secondary path; a third sound signal is obtained by passing the first sound signal through a filter; and the secondary path from the speaker to the human ear coordinates under different seat states is calculated based on the first sound signal, the second sound signal and the third sound signal.

[0099] Based on the fourth embodiment of the present application, in the fifth embodiment of the present application, the same or similar contents as those in the fourth embodiment can refer to the above description, and will not be repeated in the following. Figure 5 , Figure 5 This is a flowchart diagram of a fifth embodiment of the road noise active noise reduction method of the present application.

[0100] In this embodiment, the step S30 includes steps S310 to S340;

[0101] S310: Obtain filter weight coefficients;

[0102] S320: generating a noise reduction signal according to the vibration signal, the secondary path in the current seat state and the filter weight coefficient, and controlling the speaker to emit a corresponding noise reduction wave according to the noise reduction signal;

[0103] S330: Calculate the sound pressure signal in the human ear area according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state;

[0104] S340: updating weight coefficients according to the sound pressure signal, the secondary path and the vibration signal in the human ear area.

[0105] refer to Figure 6 , Figure 6 Block diagram for noise reduction signal calculation.

[0106] The calculation formula of the noise reduction signal is:

[0107]

[0108] y(n)=w(n)*x'(n);

[0109] Where w(n) is the filter weight coefficient, x(n) is the vibration signal, and x'(n) is the vibration signal after secondary path filtering. is the estimated value of the secondary path, * is the convolution calculation, and y(n) is the noise reduction signal.

[0110] It should be noted that the initial value of the filter weight coefficient w(n) can be set according to actual needs, and this embodiment does not limit this.

[0111] It can be understood that when no noise reduction is performed, the sound signal e(n) measured by the microphone at the human ear is equal to the primary signal d(n); the calculation formula of the primary signal d(n) is:

[0112]

[0113] Where n is the number of transmission paths.

[0114] After the noise reduction is turned on, the sound signal e(n) measured by the microphone at the human ear is equal to the difference between the primary signal d(n) and the noise reduction signal y(n) output to the human ear through the secondary path. The noise reduction signal y'(n), that is:

[0115] e(n)=d(n)-y'(n);

[0116] Since the present embodiment does not obtain the sound pressure signal in the human ear area through a microphone, it needs to be calculated through the transfer function, the secondary path and the vibration signal;

[0117] Through the above derivation, we can get

[0118] At this time, the value of e(n) may not reach the ideal range. In order to further enhance the noise reduction effect, the weight coefficient needs to be updated so that the noise reduction effect can achieve the effect of outputting the optimal noise reduction signal in real time.

[0119] The update formula of w(n) is:

[0120] w(n+1)=w(n)+μe(n)x'(n);

[0121] It can be understood that the weight coefficient reflects the relationship between the noise reduction signal, the secondary path and the vibration signal. When the transfer function, the secondary signal and the vibration signal under the current seat state are determined, the noise reduction signal can be directly generated according to the vibration signal and the weight coefficient, and the speaker can be controlled to generate the noise reduction wave according to the noise reduction signal; at this time, the effect of the noise reduction wave may not reach the optimal value, and the sound pressure signal in the human ear area can be calculated according to the transfer function and the vibration signal under the seat state, and the weight coefficient can be further iterated through the value of the sound pressure signal and the noise reduction signal, so that the noise reduction effect can achieve the effect of real-time optimal noise reduction signal output, which is conducive to improving the user experience.

[0122] In specific implementation, the filter weight coefficient is obtained; the vibration signal after secondary path filtering is calculated according to the vibration signal and the secondary path; the noise reduction signal is generated according to the vibration signal after secondary path filtering and the filter weight coefficient; the speaker is controlled to emit a corresponding noise reduction wave according to the noise reduction signal; the weight coefficient is updated according to the transfer function, secondary path, noise reduction signal and vibration signal under the current seat state, and the process returns to the step of obtaining the filter weight coefficient.

[0123] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the road noise active noise reduction method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0124] Reference Figure 7 , Figure 7 Schematic diagram of the structure of the road noise active noise reduction system. To achieve the above purpose, the present application also proposes a road noise active noise reduction system. The road noise active noise reduction method includes: a controller 1, a sensor 2 and a speaker 3;

[0125] The controller 1 is used to receive the vibration signal output by the sensor 2 and calculate the noise reduction signal according to the vibration signal, and is also used to transmit the noise reduction signal to the speaker 3;

[0126] The sensor 2 is used to collect vibration signals from the road surface and transmit the vibration signals to the controller 1;

[0127] The speaker 3 is used to receive the noise reduction signal output by the controller 1 and output a noise reduction wave according to the noise reduction signal.

[0128] It should be noted that the controller 1 may be a combinational logic controller, a microprogram controller, or a CPU controller, which is not limited in this embodiment.

[0129] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle, which can implement the steps of the road noise active noise reduction method described above.

[0130] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the road noise active noise reduction method as described above are implemented.

[0131] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0132] The computer-readable storage medium may be included in the road noise active noise reduction system; or may exist independently without being assembled into the road noise active noise reduction system.

[0133] The computer-readable storage medium carries one or more programs, and the computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, and the programming language includes an object-oriented programming language, such as Java, Smalltalk, C++, and a conventional procedural programming language, such as "C" language or a similar programming language. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0134] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0135] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0136] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions for executing the above-mentioned road noise active noise reduction method. The beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the road noise active noise reduction method provided in the above-mentioned embodiment, and will not be repeated here.

[0137] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned road noise active noise reduction method when executed by a processor.

[0138] The above description is only for the present invention and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for active road noise reduction, characterized in that: The road noise active noise reduction method comprises: Get the current seat status and vibration signal; Obtain the transfer function and secondary path under the current seat state; A noise reduction signal is calculated according to the transfer function, the secondary path and the vibration signal in the current seat state, and the speaker is controlled to emit a corresponding noise reduction wave according to the noise reduction signal.

2. The road noise active noise reduction method according to claim 1, characterized in that: The step of obtaining the transfer function and the secondary path under the current seat state comprises: Measure the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states; Measuring the secondary path from the loudspeaker to the microphone arrangement point under different seat states; establishing a database based on the transfer functions and the secondary paths; The transfer function and the secondary path under the current seat state are queried through the database.

3. The road noise active noise reduction method according to claim 2, characterized in that: The step of measuring the transfer function from the sensor arrangement point to the microphone arrangement point under different seat states specifically includes: The vibration signal of the road surface under different seat conditions is measured by sensors; The sound pressure signal of the human ear area under different seat conditions is measured by a microphone; The transfer function from the sensor arrangement point to the microphone arrangement point under different seat states is calculated according to the vibration signal and the sound pressure signal.

4. The road noise active noise reduction method according to claim 2, characterized in that: The step of measuring the secondary path from the loudspeaker to the microphone arrangement point under different seat states specifically comprises: The control speaker emits the first signal in different seat states; Acquire a second acoustic signal transmitted from the first acoustic signal to the microphone through a real secondary path; Acquire a third sound signal obtained by filtering the first sound signal; The secondary paths from the loudspeaker to the human ear coordinates under different seat states are calculated according to the first sound signal, the second sound signal and the third sound signal.

5. The road noise active reduction method according to claim 1, characterized in that: The step of calculating the noise reduction signal according to the transfer function, the secondary path and the vibration signal in the current seat state specifically includes: Get filter weight coefficients; Generate a noise reduction signal according to the vibration signal, the secondary path in the current seat state and the filter weight coefficient, and control the speaker to emit a corresponding noise reduction wave according to the noise reduction signal; The weight coefficients are updated according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state, and the process returns to the step of obtaining the filter weight coefficients.

6. The road noise active reduction method according to claim 5, characterized in that: The step of updating the weight coefficient according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state specifically includes: Calculate the sound pressure signal in the human ear area according to the transfer function, the secondary path, the noise reduction signal and the vibration signal in the current seat state; The weight coefficients are updated according to the sound pressure signal, secondary path and vibration signal in the human ear area.

7. A road noise active noise reduction system, characterized in that: The road noise active noise reduction method comprises: a controller, a sensor and a speaker; The controller is used to receive the vibration signal output by the sensor and calculate the noise reduction signal according to the vibration signal, and is also used to transmit the noise reduction signal to the speaker; The sensor is used to collect vibration signals from the road surface and transmit the vibration signals to the controller; The speaker is used to receive the noise reduction signal output by the controller and output a noise reduction wave according to the noise reduction signal.

8. A vehicle, characterized in that: The vehicle can implement the steps of the road noise active noise reduction method described in any one of claims 1-6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the road noise active noise reduction method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the road noise active noise reduction method according to any one of claims 1 to 6 are implemented.

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