WO2024169606A1

WO2024169606A1 - Noise reduction control system and method, vehicle, and device

Info

Publication number: WO2024169606A1
Application number: PCT/CN2024/074768
Authority: WO
Inventors: 张鹏举; 邱小军; 仲旭; 陶建成
Original assignee: 华为技术有限公司
Priority date: 2023-02-17
Filing date: 2024-01-30
Publication date: 2024-08-22
Also published as: CN118522268A

Abstract

A noise reduction control system and method, a vehicle, and a device. The noise reduction control system comprises: a noise reduction control apparatus (111) and a first sound collection apparatus (112), wherein the first sound collection apparatus (112) is deployed in a non-closed structure of a vehicle, and the noise reduction control apparatus (111) is connected to the first sound collection apparatus (112). The first sound collection apparatus (112) is used for collecting a sound reference signal; the noise reduction control apparatus (111) is used for: acquiring the sound reference signal collected by the first sound collection apparatus (112); and determining a first signal according to the sound reference signal, the first signal being used for noise elimination. The sound reference signal is collected by means of the first sound collection apparatus (112) deployed at the non-closed structure of the vehicle, so that the sound reference signal can reflect the noise on an air path, thereby achieving a good noise reduction effect on the noise propagated on the air path.

Description

Noise reduction control system, method, vehicle and device

This application claims priority to the Chinese patent application filed with the China Patent Office on February 17, 2023, with application number 202310188797.1 and application name “Noise Reduction Control System, Method, Vehicle and Equipment”, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of intelligent vehicle technology, and in particular to a noise reduction control system, method, vehicle and equipment.

Background Art

Noise is unavoidable when a vehicle is driving, and this noise has a great impact on the comfort of the ride. Therefore, more and more vehicles are using active noise reduction technology to eliminate the noise generated when the vehicle is driving. In the current active noise reduction technology, a vibration sensor is installed on the vehicle body to collect a reference signal, and then the noise generated by the reference signal in the vehicle is eliminated. However, the reference signal collected by the vibration sensor always reflects the noise generated by the vibration of the vehicle body, making it difficult to collect noise from other sources in the vehicle, and thus it is impossible to eliminate noise from other sources.

Summary of the invention

The embodiments of the present application provide a noise reduction control system, method, vehicle and equipment to improve the noise elimination effect.

In a first aspect, an embodiment of the present application provides a noise reduction control system, which is applied to a vehicle and may include: a noise reduction control device and a first sound collection device, wherein the first sound collection device is deployed in a non-enclosed structure of the vehicle, and the noise reduction control device is connected to the first sound collection device. The first sound collection device deployed in the non-enclosed structure of the vehicle collects an acoustic reference signal to reflect the noise on the air path through the acoustic reference signal, and the noise reduction control device obtains the acoustic reference signal collected by the first sound collection device, and determines a first signal for noise elimination based on the acoustic reference signal to eliminate the noise on the air path, thereby having a good noise reduction effect on the noise propagated on the air path.

Optionally, the first signal may be an electrical signal, an analog signal or a digital signal, which is not limited in the present application.

Optionally, the deployment location of the first sound collection device includes but is not limited to at least one of the following four examples:

Example 1: The ventilation port of the ventilation device includes but is not limited to the above-mentioned air conditioning external circulation air inlet and cabin air pressure balance air outlet.

Example 2: The seam between the car window glass and the car door.

Example 3: The connection point between the engine compartment and the steering wheel connection structure.

Example 4: The connection between the trunk and the cabin.

The above-mentioned positions have poor airtightness and generate sound leakage in the cabin. Therefore, the sound reference signals collected by the first sound collecting device at these positions can better reflect the noise propagated on the air path to improve the noise reduction effect on the air path.

In combination with the first aspect, in some possible implementations, the noise reduction control system further includes a playback device, the playback device is connected to the noise reduction control device; the noise reduction control device sends a first signal to the playback device; the playback device plays the first signal. By playing the first signal through the playback device, an acoustic signal can be generated, and the acoustic signal and the noise are offset to achieve noise elimination.

The playback device may include one or more secondary speakers with the same or similar operating frequencies. In this case, the frequency range of the sound signal played by the playback device is limited, and thus the noise that the sound signal can offset is limited. In order to effectively improve the noise reduction effect, the playback device may include two secondary speakers, such as a first secondary speaker and a second secondary speaker. The sound signals played by the first secondary speaker and the second secondary speaker can be used to offset noise of different frequencies, thereby expanding the operating frequency range of the playback device and improving the noise reduction effect.

Exemplarily, the first secondary speaker and the second secondary speaker have different operating frequency ranges, and the secondary speakers with different operating frequency ranges are respectively used to offset noises of different frequencies to improve the noise reduction effect. It should be understood that the operating frequency range of the secondary speaker may be related to the size of the secondary speaker, such as the secondary speaker operating at a lower frequency is generally larger in size.

The first secondary speaker may be deployed in a target area, which may be an area where the user's ear is located, and the target area may be determined based on a pre-estimated range of positions where the user's ear is located. Here, the first secondary speaker is deployed in the target area so that the sound signal generated by the first secondary speaker when playing the first signal can better offset the noise near the user's ear, thereby improving the noise reduction effect.

As a possible implementation, the first secondary speaker may include a first speaker disposed on a seat headrest of the vehicle, and/or a second speaker disposed on a seat back of the vehicle. When the user is sitting in the vehicle cabin, the seat headrest and a portion of the seat back are close to each other. Close to the user's ears, so deploying the first secondary speakers at these locations may better offset the noise near the user's ears, and the secondary speakers are installed more firmly.

It should be understood that, in combination with the design of the vehicle cabin, the sound emission direction of the first secondary speaker may include but is not limited to the following possible examples: for the first speaker deployed on the seat headrest, the sound emission direction of the first speaker may be toward the contact surface between the seat headrest and the user, and/or, the sound emission direction of the first speaker may be toward both sides of the headrest; for the second speaker deployed on the seat back, the sound emission direction of the second speaker may be toward the contact surface between the seat back and the user, and/or, the sound emission direction of the second speaker may be toward the upper side of the seat back.

In combination with the first aspect, in some possible implementations, the noise reduction control system also includes a vibration sensor, which is connected to the noise reduction control device; the vibration sensor is used to collect a vibration reference signal; the noise reduction control device is used to obtain the vibration reference signal collected by the vibration sensor, and determine the first signal based on the sound reference signal and the vibration reference signal.

Based on the above scheme, the vibration reference signal collected by the vibration sensor can reflect the noise generated by the vibration of the vehicle structure and/or the friction between the wheels and the road. The noise reduction control device performs signal processing based on the vibration reference signal and the sound reference signal collected by the first sound collection device to obtain a first signal for noise elimination. While eliminating the noise propagated on the air path, the noise generated by the vibration is eliminated, thereby enhancing the noise elimination capability of the first signal, that is, improving the noise reduction effect of the noise reduction control system.

Among them, the vibration sensor can be deployed at the connection between the suspension structure at the bottom of the vehicle body and the vehicle body, such as the connection between the vehicle body and the wheel.

In combination with the first aspect, in some possible implementations, the noise reduction control system further includes a second sound collection device. The second sound collection device is deployed in the target area and is used to collect an error signal, which is a signal obtained by eliminating the noise in the target area from the first signal of the first time unit; the noise reduction control device obtains the error signal collected by the second sound collection device, and determines a noise elimination parameter based on the error signal, the noise elimination parameter is used to indicate the degree of noise elimination of the first signal, and then determines the first signal of the second time unit based on the noise elimination parameter.

The time unit may be a sampling moment of the acoustic reference signal, or a sampling period of the sampling moment of the acoustic reference signal, the acoustic reference signal is composed of signals sampled in multiple time units, and the first time unit is any one of the multiple time units. The noise reduction control device may generate a first signal in a corresponding time unit based on the acoustic reference signal of each time unit, such as the noise reduction control device generates a first signal in a second time unit based on the acoustic reference signal of the first time unit.

The above-mentioned second time unit is later than the first time unit. The second time unit can be a time unit adjacent to the first time unit, or there is a time interval between the second time unit and the first time unit. The time interval between the second time unit and the first time unit is related to the delay in acquiring the error signal and performing signal processing on the error signal.

Based on the above scheme, the first signal can be adjusted in real time through the collected error signal. On the one hand, the strength of noise elimination is adjusted according to the degree of noise elimination; on the other hand, the first signal is adjusted according to the convergence speed of the error signal to avoid the divergence of the first signal caused by too fast convergence.

In combination with the first aspect, in some embodiments, the noise reduction control device can obtain a secondary acoustic feedback signal based on a path response between the playback device and the first sound collection device and a first signal within a third time unit, where the secondary acoustic feedback signal is a signal collected by the first sound collection device after the acoustic signal is propagated through the path, and the acoustic signal is generated by the playback device playing the first signal within the third time unit; and process the acoustic reference signal collected by the first sound collection device based on the secondary acoustic feedback signal to eliminate the secondary acoustic feedback signal in the acoustic reference signal; and then determine the first signal within a fourth time unit based on the processed acoustic reference signal; wherein the third time unit is earlier than the fourth time unit.

The third time unit and the fourth time unit may both be time units among a plurality of time units for collecting acoustic reference signals, and the third time unit is earlier than the fourth time unit. The third time unit and the fourth time unit may be adjacent time units, or there may be a time interval between the third time unit and the fourth time unit, and the time interval between the third time unit and the fourth time unit is related to the secondary acoustic feedback elimination processing delay.

Since the first sound collection device continuously collects the sound reference signal while the playback device plays the first signal to generate the sound signal, the sound reference signal collected by the first sound collection device will inevitably be affected by the sound signal played by the playback device, thereby affecting the noise reduction effect. Therefore, based on the above scheme, performing secondary sound feedback elimination on the sound reference signal collected by the first sound collection device can improve the noise reduction effect.

In combination with the first aspect, in some possible implementations, the noise reduction control device can determine whether the first signal meets a preset condition; when the first signal meets the preset condition, the first signal is sent to the playback device, and when the first signal does not meet the preset condition, the first signal is not sent to the playback device; the preset condition includes: the amplitude of the first signal is less than or equal to the preset amplitude, and/or the first signal does not undergo signal divergence.

Since the amplitude of the first signal is too large or the first signal has signal divergence, it is easy to cause the speaker of the playback device to howl, affecting the riding comfort of the user. Therefore, after determining that the first signal meets the preset conditions, the noise reduction control device sends it to the playback device for playback, avoiding the speaker of the playback device from howling, thereby improving the reliability and stability of the noise reduction control system.

It should be understood that the noise reduction control module can perform divergence suppression processing on each time unit or time units within each interval in the first signal. For example, if it is determined that the first signal in time units _m1 to _m5 is divergent, the first signal in time units _m1 to _m5 will not be sent to the playback device, but the non-divergent first signals in other time units will still be sent to the playback device.

In a second aspect, an embodiment of the present application provides a vehicle, which includes the noise reduction control system in the first aspect and each possible implementation manner of the first aspect.

In a third aspect, an embodiment of the present application provides a noise reduction control method, which can be performed by a noise reduction control device, and the noise reduction control device can be implemented as a chip, a chip system or an electronic device.

Exemplarily, the method includes: a noise reduction control device acquires an acoustic reference signal collected by a first sound collection device, the acoustic reference signal includes a secondary acoustic feedback signal, the secondary acoustic feedback signal is a signal collected by the first sound collection device after the acoustic signal is propagated through a path, the acoustic signal is generated by a playback device playing a first signal, the first signal is used to perform noise elimination, the first signal within a third time unit is determined based on the acoustic reference signal collected by the third time unit; a secondary acoustic feedback signal is obtained according to a path response between the playback device and the first sound collection device and the first signal within the third time unit; the acoustic reference signal collected by the first sound collection device is processed according to the secondary acoustic feedback signal, and the secondary acoustic feedback signal in the acoustic reference signal is eliminated; and a first signal within a fourth time unit is determined according to the processed acoustic reference signal; wherein the third time unit is earlier than the fourth time unit.

Since the first sound collection device continuously collects the sound reference signal while the playback device plays the first signal to generate the sound signal, the sound reference signal collected by the first sound collection device will inevitably be affected by the sound signal played by the playback device, thereby affecting the earlier effect. Therefore, based on the above scheme, performing secondary sound feedback elimination on the sound reference signal collected by the first sound collection device can improve the noise reduction effect.

In a fourth aspect, the present embodiment provides a control device, the control device comprising: an acquisition module, used to acquire an acoustic reference signal collected by a first sound collection device, the acoustic reference signal comprising the first signal, the first signal being a signal collected by the first sound collection device after the acoustic signal is propagated through a path, the acoustic signal being generated by a first signal played by a playback device, the first signal being used to perform noise elimination, and the first signal within a third time unit being determined based on the acoustic reference signal collected by the third time unit; a secondary acoustic feedback elimination module, used to obtain a secondary acoustic feedback signal based on a path response between the playback device and the first sound collection device and the first signal within the third time unit; the secondary acoustic feedback elimination module is further used to process the acoustic reference signal collected by the first sound collection device based on the first signal, and eliminate the secondary acoustic feedback signal in the acoustic reference signal; a noise reduction control module, used to determine the first signal within a fourth time unit based on the processed acoustic reference signal; wherein the third time unit is earlier than the fourth time unit.

The beneficial effects of the control device provided in the fourth aspect can be referred to the beneficial effects brought about by the third aspect, and will not be repeated here.

In a fifth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which enable a computer to execute the method of the third aspect.

In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium for storing computer program instructions, wherein the computer program enables a computer to execute the method of the third aspect.

In a seventh aspect, an embodiment of the present application provides a chip, comprising: a processor, configured to call and execute computer instructions stored in a memory from the memory, so that a device equipped with the chip executes the method of the third aspect.

In a ninth aspect, an embodiment of the present application provides an electronic device, comprising: a processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory, and executing the method of the third aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a and FIG. 1b are schematic diagrams of an application scenario of noise reduction control provided in an embodiment of the present application;

FIG2 is a schematic diagram of a hardware structure of a vehicle provided in an embodiment of the present application;

FIG3 is a schematic diagram of the hardware structure of another vehicle provided in an embodiment of the present application;

FIG4a is a schematic diagram of a secondary speaker deployment position provided by an embodiment of the present application;

FIG4b is a schematic diagram of another secondary speaker deployment position provided by an embodiment of the present application;

FIG5a is a schematic diagram of another secondary speaker deployment position provided by an embodiment of the present application;

FIG5 b is a schematic diagram of another secondary speaker deployment position provided by an embodiment of the present application;

FIG6 is a schematic diagram of another secondary speaker deployment position provided in an embodiment of the present application;

FIG7 is a schematic diagram of a noise reduction control process provided by an embodiment of the present application;

FIG8 is a schematic diagram of a hardware architecture of an electronic device provided in an embodiment of the present application;

FIG. 9 is a flow chart of a noise reduction control method provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

The vehicle in the embodiments of the present application may be an intelligent vehicle, such as an autonomous driving vehicle that realizes all functions as automatic control, or an assisted driving vehicle that realizes some functions as automatic control to provide driving assistance, or may be an ordinary vehicle, which is collectively referred to as a vehicle below for ease of description. In addition, the vehicle in the embodiments of the present application may also be an ordinary vehicle, in which case the vehicle may be automatically controlled by an external device of the vehicle.

As shown in Figure 1a, there are inevitably some non-enclosed structures in the composition structure of the vehicle, such as holes and gaps in the vehicle structure, such as the air-conditioning external circulation air inlet, the gap between the window glass and the door sheet metal, the cabin air pressure balance outlet, the hole connecting the engine compartment and the steering wheel, the connection between the trunk and the cabin, etc. During the driving process of the vehicle, these non-enclosed structures will cause sound leakage, so that a large part of the noise energy leaks into the vehicle when the vehicle is driving. For users sitting in the vehicle cabin, these noises are received by the human ear, which has a great impact on the comfort of the users.

In this regard, the embodiment of the present application deploys a sound collection device (such as the first sound collection device mentioned below) in a non-enclosed structure of the vehicle to collect an acoustic reference signal of the noise propagating on the air path, and then generates a signal for canceling the noise based on the acoustic reference signal (such as the first signal mentioned below). The first signal is played to cancel the noise propagating on the air path to achieve noise elimination, thereby improving the noise reduction effect, see Figure 1b.

FIG2 is a schematic diagram of the hardware structure of a vehicle provided in an embodiment of the present application. As shown in FIG2 , a noise reduction control system 110 is deployed in the vehicle 100, and the noise reduction control system 110 includes a noise reduction control device 111 and a first sound collection device 112. The noise reduction control device 111 is connected to the first sound collection device 112.

The first sound collecting device 112 may be implemented as a microphone (or sound sensor). In order to collect the noise generated by the air flow in the non-enclosed structure during the vehicle's driving, the first sound collecting device 112 is deployed in the non-enclosed structure of the vehicle.

The deployment position of the first sound collecting device 112 includes but is not limited to at least one of the following four examples:

Example 2: The seam between the car window glass and the car door.

Example 4: The connection between the trunk and the cabin.

It should be understood that the embodiment of the present application does not limit the number of the first sound collection devices 112. For example, one or more first sound collection devices 112 may be deployed at one of the deployment positions in the above examples; or the first sound collection devices 112 may be deployed at some or all of the deployment positions in the above examples, and one or more first sound collection devices 112 may be deployed at each deployment position. For example, a first sound collection device 112 may be deployed at the air inlet of the air conditioner external circulation and the air outlet of the cabin air pressure balance, a first sound collection device 112 may be deployed at the joint between the window glass and the sheet metal of each door, and eight microphones may be deployed at the connection point between the transmitting cabin and the steering wheel connection structure.

The first sound collection device 112 can collect an acoustic reference signal. The acoustic reference signal can at least reflect the noise of the air path in the non-enclosed structure of the vehicle, such as the noise generated by the air flow in the non-enclosed structure during driving. The acoustic reference signal can also reflect the vehicle noise including: for example, the noise generated by the vibration of the vehicle structure, the tire noise (or road noise) generated by the friction between the tire and the road, the engine noise, etc.

The first sound collection device 112 sends the acoustic reference signal to the noise reduction control device 111, and the noise reduction control device 111 obtains the acoustic reference signal and performs signal processing according to the acoustic reference signal to determine a first signal for achieving noise elimination. Optionally, the first signal can be an electrical signal, an analog signal or a digital signal, which is not limited in this application.

The acoustic signal generated by playing the first signal through the speaker can be used to offset the noise signal in the target area (such as near the human ear) in the vehicle to achieve noise cancellation.

It should be noted that when the noise control system 110 includes a plurality of first sound collection devices 112, the plurality of first sound collection devices 112 send the sound reference signals collected by themselves to the noise reduction control device 111, and the noise reduction control device 111 generates a reference signal for each first sound collection device 112. The device 112 generates a corresponding signal for noise elimination based on the acoustic reference signal sent by the device 112, and the first signal is synthesized by the signals for noise elimination corresponding to the multiple acoustic reference signals. For ease of explanation, the following is an example of an exemplary description in which the noise reduction control device 111 deploys a first sound collection device 112.

In the embodiment of the present application, a first sound collecting device 112 deployed at a non-enclosed structure of the vehicle collects an acoustic reference signal to reflect the noise on the air path through the acoustic reference signal, and a noise reduction control device 111 performs signal processing based on the acoustic reference signal to obtain a first signal for noise elimination, so as to eliminate the noise on the air path, thereby achieving a good noise reduction effect.

Fig. 3 is a schematic diagram of the hardware structure of another vehicle provided in an embodiment of the present application. As shown in Fig. 3, the noise reduction control system 110 further includes a playback device 113. The noise reduction control device 111 is connected to the playback device 113.

The noise reduction control device 111 sends the first signal to the playback device 113. The playback device 113 plays the first signal to generate an acoustic signal, which cancels the noise in the target area to achieve noise cancellation. The target area may be the area where the user's ear is located, and the target area may be determined based on a pre-estimated position range of the user's ear.

The hardware of the playback device 113 may be implemented as a secondary speaker. The hardware of the noise reduction control device 111 may be implemented as a vehicle controller or a component in the vehicle controller. The embodiment of the present application does not limit the deployment position of the noise reduction control device 111 in the vehicle.

The playback device 113 may include one or more first secondary speakers 1131 as shown in FIG3. In order to achieve a better noise reduction effect, the first secondary speakers 1131 may be deployed in the aforementioned target area, that is, close to the user's ears. When the first secondary speakers 1131 are deployed in the target area, they may include: a first speaker deployed in the seat headrest, and/or a second speaker deployed in the seat back.

In the first example, see FIG4a and FIG4b, the first secondary speaker 1131 may include two first speakers deployed on the seat headrest. The sound emission direction of the first speaker may be toward the contact surface between the seat headrest and the user, see FIG4a; or, the sound emission direction of the first speaker may be toward both sides of the seat headrest, see FIG4b. In addition, the first speaker may have at least two different sound emission directions, or the first speaker may include two speakers with different sound emission directions, such as one sound emission direction of the first speaker toward the contact surface between the seat headrest and the user, and the other sound emission direction toward one side of the seat headrest.

In the second example, see Figures 5a and 5b, the first secondary speaker 1131 may include two second speakers deployed on the seat back. The sound emission direction of the second speaker may be toward the contact surface between the seat back and the user, see Figure 5a; or, the sound emission direction of the second speaker may be toward the upper side of the seat back, see Figure 5b. Similar to the first speaker, the second speaker may have at least two different sound emission directions, or the second speaker may include two speakers with different sound emission directions, such as one sound emission direction of the second speaker toward the contact surface between the seat back and the user, and the other sound emission direction toward the upper side of the seat back.

In a third example, the first secondary speaker 1131 may include a first speaker disposed on a seat headrest and a second speaker disposed on a seat back. The deployment method of the first speaker is as described in the first example above, and the deployment method of the second speaker is as described in the second example above, which will not be described in detail for the sake of brevity.

In addition to the above three possible examples, the first secondary speaker 1131 can also be deployed at the top of the inside of the vehicle, see Figure 6, or the first secondary speaker 1131 can be deployed by connecting the bracket to the vehicle structure. This application does not limit the deployment position of the first secondary speaker. As long as the first secondary speaker 1131 is deployed at any position within the target area, it belongs to the protection scope of this application. The first secondary speaker 1131 is deployed in the target area, which can be understood as the distance between the first secondary speaker 1131 and the user's ear position is less than or equal to the preset value. It can be understood that the smaller the preset value is set, that is, the closer the distance between the first secondary speaker 1131 and the user's ear position is, the better the noise reduction effect.

It should be noted that the above-mentioned user can be a user sitting in any seat position in the vehicle, for example, the user can sit in the main driver's seat, the co-pilot seat or the back seat. Accordingly, the target area may include the area where the ear position of the user sitting in any seat position is located. That is, the first secondary speaker 1131 can be deployed for some or all of the users who can sit in the vehicle cabin. For example, the first secondary speaker 1131 can be deployed in at least one of the following areas: the area where the ear position of the main driver is located, the area where the ear position of the co-pilot is located, or the area where the ear position of any user sitting in the back seat is located.

The operating frequency range of the first secondary speaker 1131 can be relatively large, and can play most audios to achieve a better noise elimination effect. For example, the operating frequency range of the first secondary speaker 1131 is 80 to 1000 Hz. The size of the first secondary speaker 1131 can be greater than or equal to 2 inches and less than or equal to 5 inches. For example, the size of the first secondary speaker 1131 is 3 inches.

For the sake of the aesthetics of the vehicle interior and the comfort of the ride, the size of the first secondary speaker 1131 deployed in the target area cannot be too large. Due to the size limitation, the operating frequency range of the first secondary speaker 1131 is difficult to cover lower frequencies. Therefore, in order to further improve the noise reduction effect of the noise reduction control system 110, the playback device 113 may also include a second secondary speaker 1132 as shown in FIG. 3. The operating frequency range of the second secondary speaker 1132 is different from that of the first secondary speaker 1131. The working ranges of 1131 may not overlap or may partially overlap, for example, the working frequency range of the first secondary speaker 1131 is 80-1000Hz, and the working frequency range of the second secondary speaker 1132 is 20-80Hz, or for another example, the working frequency range of the first secondary speaker 1131 is 80-1000Hz, and the working frequency range of the second secondary speaker 1132 is 20-200Hz. The second secondary speaker 1132 can make up for the deficiency of the first secondary speaker 1131 in low-frequency playback ability, and then the second secondary speaker 1132 can achieve noise elimination in the low-frequency range, thereby improving the noise reduction effect.

Generally speaking, the second secondary speaker 1132 for low-frequency playback is also larger in size. For example, the size of the second secondary speaker 1132 is greater than or equal to 6 inches and less than or equal to 15 inches. Of course, the second secondary speaker 1132 may have a larger size due to its lower operating frequency range, and this application does not limit this.

The present application does not limit the deployment position of the second secondary speaker 1132, because it is larger in size and can be deployed under the seat or in the trunk.

Optionally, both the first secondary speaker 1131 and the second secondary speaker 1132 may be deployed to achieve noise reduction control, or the first secondary speaker 1131 and the second secondary speaker 1132 may reuse existing speakers in the vehicle. For example, the first secondary speaker 1131 may reuse a full-range speaker in the vehicle, and the second secondary speaker 1132 may reuse a low-frequency speaker in the vehicle.

In some embodiments, the playback device 113 may be independent of the noise reduction control system. The noise reduction control system 110 is connected to the playback device 113 deployed in the vehicle 110 and sends a first signal to the playback device 113. The playback device 113 plays the first signal to generate a sound signal to achieve noise elimination.

In order to further improve the noise reduction effect and achieve comprehensive noise reduction of the vehicle interior, referring to FIG. 3 , a vibration sensor 114 connected to the noise reduction control device 111 may also be deployed in the noise reduction control system 110 .

The vibration sensor 114 can be deployed at the connection between the suspension structure at the bottom of the vehicle body and the vehicle body, such as the connection between the vehicle body and the wheel. The vibration sensor 114 can be an acceleration sensor, such as a three-axis accelerometer. The vibration sensor 114 can be deployed at the connection between a wheel and the vehicle body, or at the connection between multiple wheels and the vehicle body, respectively, and one or more vibration sensors 114 can be deployed at the connection between each wheel and the vehicle body, and this application does not limit this. For example, the vibration sensor 114 can include eight three-axis accelerometers, which are respectively deployed at the main connection points between the wheel and the vehicle body, such as two three-axis accelerometers are deployed at the connection point between each wheel and the vehicle body. This application does not limit the number and specifications of the vibration sensor 114.

The vibration sensor 114 is used to collect a vibration reference signal. During the driving process of the vehicle, the vibration reference signal can reflect the noise generated by the vibration of the vehicle structure and/or the friction between the wheels and the lane. Then, the vibration sensor 114 sends the collected vibration reference signal to the noise reduction control device 111, and the noise reduction control device 111 obtains the vibration reference signal, and performs signal processing based on the vibration reference signal to generate a signal for noise elimination. In addition to the signal for noise elimination of the acoustic reference signal, the aforementioned first signal also includes a signal for noise elimination of the vibration reference signal.

It should be noted that when the noise control system 110 includes multiple vibration sensors 114, the multiple vibration sensors 114 send the vibration reference signals collected by themselves to the noise reduction control device 111. The noise reduction control device 111 generates a corresponding signal for noise elimination for each vibration reference signal sent by the vibration sensor 114. The first signal is synthesized by the signals for noise elimination corresponding to the multiple vibration reference signals.

In the embodiment of the present application, a vibration reference signal is collected by the vibration sensor 114 to reflect the noise generated by the vehicle structure vibration and/or the friction between the wheels and the road. The noise reduction control device 111 performs signal processing based on the vibration reference signal and the sound reference signal collected by the first sound collection device 112 to obtain a first signal for noise elimination, thereby improving the noise elimination capability of the first signal and improving the noise reduction effect.

Referring to FIG. 3 , the noise reduction control system 110 further includes a second sound collection device 115, which is connected to the noise reduction control device 111. The software and hardware implementations of the second sound collection device 115 and the first sound collection device 112 may be the same or different, and the second sound collection device 115 and the first sound collection device 115 are deployed at different locations. The second sound collection device 115 is deployed in the target area to collect an error signal of the area where the user's ear is located. The error signal is a signal obtained by eliminating the noise in the target area with the first signal of the first time unit, and the error signal can reflect the noise elimination effect of the target area.

The time unit may be a sampling moment of the acoustic reference signal, or a sampling period of the sampling moment of the acoustic reference signal, the acoustic reference signal is composed of signals sampled in multiple time units, and the first time unit is any one of the multiple time units. The noise reduction control device 111 may generate a first signal in a corresponding time unit based on the acoustic reference signal of each time unit, such as the noise reduction control device 111 generates a first signal in a second time unit based on the acoustic reference signal of the first time unit.

Furthermore, the noise reduction control device 111 may obtain the error signal collected by the second sound collection device 115, and according to the error signal, The first signal of the second time unit is adjusted. The second time unit is later than the first time unit, the second time unit may be a time unit adjacent to the first time unit, or there is a time interval between the second time unit and the first time unit, and the time interval between the second time unit and the first time unit is related to the delay of acquiring the error signal and performing signal processing on the error signal.

Exemplarily, after the noise reduction control device 111 obtains the error signal collected by the second sound collection device 115, it can determine a noise elimination parameter based on the error signal, where the noise elimination parameter is used to indicate the degree of noise elimination, and then determine the first signal of the second time unit based on the noise elimination parameter.

The first signal can be adjusted in real time through the error signal. On the one hand, the strength of noise elimination is adjusted according to the degree of noise elimination; on the other hand, the first signal is adjusted according to the convergence speed of the error signal to avoid the divergence of the first signal caused by too fast convergence.

The signal processing process of the noise reduction control device 111 is exemplarily described below with reference to the accompanying drawings.

Fig. 7 is a schematic diagram of a noise reduction control process provided by an embodiment of the present application. As shown in Fig. 7, the noise reduction control device 111 may include at least a noise reduction control module 1112, which may perform signal processing based on the signal collected by the sensor to obtain a first signal for noise elimination. The specific implementation process has been described above and will not be repeated here.

It is understandable that, when the playback device 113 plays the first signal to generate the sound signal, the first sound collection device 112 continuously collects the sound reference signal, and the sound reference signal collected by the first sound collection device 112 will inevitably be affected by the sound signal played by the playback device 113, thereby affecting the noise reduction effect. Therefore, in some embodiments, the noise reduction control device 111 further includes a secondary sound feedback elimination module 1111, which can filter the sound reference signal collected by the first sound collection device 112 to improve the noise reduction effect.

Specifically, the secondary acoustic feedback elimination module 1111 can obtain the secondary acoustic feedback signal according to the first path response and the first signal in the third time unit before the noise reduction control module 1112 determines the first signal in the fourth time unit. Further, the noise reduction control module 1112 processes the acoustic reference signal collected by the first sound collection device according to the secondary acoustic feedback signal, eliminates the secondary acoustic feedback signal in the acoustic reference signal, and then determines the first signal in the fourth time unit according to the processed acoustic reference signal. The first path response is the path response between the playback device 112 and the first sound collection device 112, that is, the secondary acoustic feedback path in FIG. 7, which is collectively referred to as the first response path for ease of description.

Among them, the secondary acoustic feedback signal is a signal collected by the first sound collection device 112 after the acoustic signal played by the playback device 113 is propagated through the path. The path of the acoustic signal from the playback device 113 to the first sound collection device 112 is the secondary acoustic feedback path in Figure 7. The secondary acoustic feedback signal is propagated to the first sound collection device 112 through the secondary acoustic feedback path, so that there is a signal delay, amplitude attenuation, and frequency response change between the secondary acoustic feedback signal and the first signal. The first path response can reflect the impact of the secondary acoustic feedback path on the signal delay, amplitude and frequency response changes. Therefore, the secondary acoustic feedback elimination module 1111 needs to determine the secondary acoustic feedback signal propagated to the first sound collection device 112 based on the first path response and the first signal.

The third time unit and the fourth time unit may both be time units among a plurality of time units for collecting acoustic reference signals, and the third time unit is earlier than the fourth time unit. The third time unit and the fourth time unit may be adjacent time units, or there may be a time interval between the third time unit and the fourth time unit, and the time interval between the third time unit and the fourth time unit is related to the signal processing delay of the secondary acoustic feedback elimination module 1111 and the noise reduction control module 1112.

Exemplarily, the acoustic reference signal collected by the first sound collection device 112 is x ₁ (n). The secondary acoustic feedback elimination module 1111 may convolve the first signal y(n) of the third time unit (n) and the first path response s _r (n) to obtain a secondary acoustic feedback signal x ₂ (n). The noise reduction control module 1112 calculates the difference between the acoustic reference signal x ₁ (n) and the secondary acoustic feedback signal x ₂ (n), eliminates the secondary acoustic feedback signal in the acoustic reference signal, and obtains a processed acoustic reference signal Then according to the processed acoustic reference signal The first signal within the fourth time unit is determined. Eliminating the secondary acoustic feedback signal in the acoustic reference signal may be implemented based on the following formula:

Among them, * represents the convolution operation.

It should be understood that when the noise reduction control system 110 is deployed with multiple first sound collection devices, the noise reduction control device 111 can implement the above-mentioned secondary sound feedback elimination process for each first sound collection device.

The above-mentioned first path response can be determined in advance based on path modeling. The path modeling process can be implemented by a module in the noise reduction control device 111, or can be implemented by a device outside the noise reduction control system. The present application does not limit this. The noise reduction control device 111 is used as the execution subject for exemplary description below. The noise reduction control device 111 inputs the second signal into the playback device 113. During the process of the playback device 113 playing the second signal, the signal collected by the first sound collection device 112 is obtained, and the first path response is determined based on the signal collected by the first sound collection device 112 and the second signal. Among them, the second signal can be a known full-band signal, such as a white noise signal. The following The process of determining the second path response corresponding to the secondary path is similar to that of the secondary path, except that the noise reduction control device 111 obtains the signal collected by the second sound collection device 115 during the process of the playback device 113 playing the second signal, and determines the second path response based on the signal collected by the second sound collection device 112 and the second signal.

The secondary acoustic feedback elimination module 1111 sends the processed acoustic reference signal to the noise reduction control module 1112 , and the noise reduction control module 1112 performs signal processing according to the received acoustic reference signal and the vibration reference signal obtained from the vibration sensor 114 and the error signal to obtain a first signal.

Referring to FIG. 7 , in some embodiments, the noise reduction control device 111 further includes a divergence suppression module 1113. The secondary acoustic feedback elimination module 1111 sends the generated first signal to the divergence suppression module 1113, and the divergence suppression module 1113 determines whether the first signal meets a preset condition. When the first signal meets the preset condition, the first signal is sent to the playback device 113. When the first signal does not meet the preset condition, the first signal is not sent to the playback device 113, that is, the first signal is not played. The preset condition includes: the amplitude of the first signal is less than or equal to the preset amplitude, and/or the first signal does not have signal divergence. Exemplarily, the divergence suppression module 1113 can perform divergence suppression processing on each time unit or time units within each interval in the first signal. For example, the divergence suppression module 1113 determines that the first signal within time units m ₁ to m ₅ is divergent. The divergence suppression module 1113 does not send the first signal within time units m ₁ to m ₅ to the playback device 113, but still sends the non-divergent first signals in other time units to the playback device 113.

If the amplitude of the first signal is too large or there is signal divergence in the first signal, it is easy to cause the speaker of the playback device 113 to howl, affecting the riding comfort of the user. Therefore, after determining that the first signal meets the preset conditions, the noise reduction control device 111 sends it to the playback device 113 for playback, avoiding the speaker of the playback device 113 from howling, thereby improving the reliability and stability of the noise reduction control system.

In some embodiments, the noise reduction control device 111 further includes an acquisition module, which can be used to acquire the sound reference signal collected by the first sound collection device 112 , the error signal collected by the second sound collection device 115 , and the vibration reference signal collected by the vibration sensor 114 .

In some embodiments, the noise reduction control device 111 further includes a sending module. The sending module can be used to send the first signal to the playback device.

The above-mentioned acquisition module and sending module can both be implemented as input/output interfaces (input/output, I/O).

The noise reduction control device 111 in the above-mentioned noise reduction control system 110 can be implemented in hardware as an electronic device 200 as shown in Figure 8. The electronic device 200 may include a processor 210 and a memory 220. The processor 210 and the memory 220 communicate with each other through an internal connection path. The memory 220 is used to store instructions, and the processor 210 is used to execute the instructions stored in the memory 220.

Optionally, the memory 220 may include a read-only memory and a random access memory, and provide instructions and data to the processor 210. The memory 220 may be a separate device or may be integrated in the processor 210.

In some embodiments, the electronic device 200 may further include an input interface 230. The processor 210 may control the input interface 230 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

In some embodiments, the electronic device 200 may further include an output interface 240. The processor 210 may control the output interface 240 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

The division of the units in the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated.

It should be understood that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or performed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to complete, or a combination of hardware and software modules in the decoding processor to complete. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), and so on. DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

FIG9 is a flow chart of a noise reduction control method provided in an embodiment of the present application. The execution subject of the method may be the noise reduction control device in any of the aforementioned embodiments. As shown in FIG9 , the method 300 includes:

S310, obtaining an acoustic reference signal collected by a first sound collection device, the acoustic reference signal including a secondary acoustic feedback signal, the secondary acoustic feedback signal being a signal collected by the first sound collection device after the acoustic signal propagates through a path, the acoustic signal being generated by a playback device playing a first signal, the first signal being used for noise elimination, and the first signal within a third time unit being determined based on the acoustic reference signal collected by the third time unit;

S320, obtaining a secondary sound feedback signal according to a path response between the playback device and the first sound collection device and the first signal within a third time unit;

S330, processing the acoustic reference signal collected by the first sound collection device according to the secondary acoustic feedback signal, and eliminating the secondary acoustic feedback signal in the acoustic reference signal;

S340, determining a first signal within a fourth time unit according to the processed acoustic reference signal;

Among them, the third time unit is earlier than the fourth time unit.

The specific implementation method of the noise reduction control method in the embodiment of the present application has been described in detail in the above-mentioned device embodiment, and will not be repeated here for the sake of brevity.

In the above-described embodiments, the first, second and various digital numbers are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application, for example, to distinguish different devices, different signals, different time units, different path responses, etc.

In the above-mentioned embodiments, "at least one" means one or more, and "more" means two or more. "And/or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and/or B may mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B may be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship.

In the embodiments of the present application, "connection" may be a direct connection or an indirect connection; in addition, it may refer to an electrical connection or a communication connection; for example, the connection between two electrical components A and B may refer to a direct connection between A and B, or may refer to an indirect connection between A and B through other electrical components or a connection medium, so that electrical signals can be transmitted between A and B; for another example, the connection between two devices A and B may refer to a direct connection between A and B, or may refer to an indirect connection between A and B through other communication devices or communication media, as long as communication between A and B can be performed.

An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

In some embodiments, the computer-readable storage medium can be applied to the noise reduction control device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding process of the embodiments of the present application, which will not be described here for the sake of brevity.

An embodiment of the present application also provides a computer program product, including computer program instructions.

In some embodiments, the computer program product can be applied to the noise reduction control device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding process of the embodiments of the present application, which will not be described in detail here for the sake of brevity.

The embodiment of the present application also provides a computer program.

In some embodiments, the computer program can be applied to the noise reduction control device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding process of the embodiments of the present application. For the sake of brevity, it will not be repeated here.

An embodiment of the present application also provides a smart vehicle.

In some embodiments, the vehicle includes a noise reduction control system in an embodiment of the present application. The noise reduction control system is used to execute the corresponding process of the embodiment of the present application.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A noise reduction control system, characterized in that it is applied to a vehicle, comprising: a noise reduction control device and a first sound collection device, wherein the first sound collection device is deployed in a non-enclosed structure of the vehicle, and the noise reduction control device is connected to the first sound collection device;

The first sound collection device is used to collect sound reference signals;

The noise reduction control device is used for:

Acquiring a sound reference signal collected by the first sound collection device;

A first signal is determined according to the acoustic reference signal, where the first signal is used for noise elimination.
The system according to claim 1, wherein the non-enclosed structure comprises at least one of the following:

A ventilation port of a ventilation device;

The seam between the window glass and the door;

The connection point between the engine compartment and the steering wheel connection structure;

The connection between the trunk and the cockpit.
The system according to claim 1 or 2, further comprising: a playback device, the playback device being connected to the noise reduction control device;

The noise reduction control device sends the first signal to the playback device;

The playing device plays the first signal.
The system according to claim 3, characterized in that the playback device further comprises a first secondary speaker and a second secondary speaker;

The size of the first secondary speaker is greater than or equal to 2 inches and less than or equal to 5 inches; and/or,

The size of the second secondary speaker is greater than or equal to 6 inches and less than or equal to 15 inches.
The system according to claim 3 or 4, characterized in that the playback device comprises a first secondary speaker and a second secondary speaker;

The first secondary speaker and the second secondary speaker have different operating frequency ranges.
The system according to claim 4 or 5 is characterized in that the first secondary speaker is deployed in a target area, and the target area is an area where the ears of the user in the vehicle are located.
The system according to any one of claims 4 to 6, characterized in that the first secondary speaker comprises a first speaker deployed on a seat headrest of the vehicle, and/or a second speaker deployed on a seat back of the vehicle.
The system according to any one of claims 1 to 7, further comprising: a vibration sensor, the vibration sensor being connected to the noise reduction control device;

The vibration sensor is used to collect a vibration reference signal;

The noise reduction control device is specifically used for:

Acquiring a vibration reference signal collected by the vibration sensor;

The first signal is determined based on the acoustic reference signal and the vibration reference signal.
The system according to any one of claims 1 to 8, characterized in that it further comprises: a second sound collection device, the second sound collection device is deployed in a target area, and the target area is an area where the user's ear is located in the vehicle;

The second sound collecting device is used to collect an error signal, where the error signal is a signal obtained by eliminating the noise in the target area from the first signal of the first time unit;

The noise reduction control device is specifically used for:

Acquiring an error signal collected by the second sound collecting device;

Determining a noise cancellation parameter according to the error signal, wherein the noise cancellation parameter is used to indicate a degree of noise cancellation of the first signal;

determining a first signal of a second time unit according to the noise elimination parameter;

The first time unit is earlier than the second time unit.
The system according to any one of claims 3 to 9, characterized in that the noise reduction control device is specifically used for:

Obtaining a secondary acoustic feedback signal according to a path response between the playback device and the first sound collection device and the first signal within a third time unit, wherein the secondary acoustic feedback signal is a signal collected by the first sound collection device after the acoustic signal propagates through the path, and the acoustic signal is generated by the playback device playing the first signal within the third time unit;

The acoustic reference signal collected by the first sound collection device is processed according to the secondary acoustic feedback signal to eliminate the acoustic reference signal. Secondary acoustic feedback signal in the signal;

determining a first signal within a fourth time unit according to the processed acoustic reference signal;

The third time unit is earlier than the fourth time unit.
The system according to any one of claims 3 to 5, characterized in that the noise reduction control device is specifically used for:

Determining whether the first signal meets a preset condition;

When the first signal meets a preset condition, sending the first signal to the playback device;

The preset conditions include: the amplitude of the first signal is less than or equal to a preset amplitude, and/or the first signal does not undergo signal divergence.
A vehicle, characterized by comprising the noise reduction control system according to any one of claims 1 to 11.
A noise reduction control method, characterized by comprising:

Acquire an acoustic reference signal collected by a first sound collection device, the acoustic reference signal comprising a secondary acoustic feedback signal, the secondary acoustic feedback signal being a signal collected by the first sound collection device after the acoustic signal propagates through a path, the acoustic signal being generated by a playback device playing a first signal, the first signal being used for noise elimination, and the first signal within a third time unit being determined based on the acoustic reference signal collected by the third time unit;

obtaining a secondary sound feedback signal according to a path response between the playback device and the first sound collection device and the first signal within the third time unit;

Processing the acoustic reference signal collected by the first sound collection device according to the secondary acoustic feedback signal to eliminate the secondary acoustic feedback signal in the acoustic reference signal;

determining a first signal within a fourth time unit according to the processed acoustic reference signal;

The third time unit is earlier than the fourth time unit.
A control device, characterized in that it comprises:

an acquisition module, configured to acquire an acoustic reference signal collected by a first sound collection device, wherein the acoustic reference signal includes a secondary acoustic feedback signal, wherein the secondary acoustic feedback signal is a signal collected by the first sound collection device after the acoustic signal propagates through a path, wherein the acoustic signal is generated by a first signal played by a playback device, wherein the first signal is used for noise elimination, and wherein the first signal within a third time unit is determined based on the acoustic reference signal collected by the third time unit;

A secondary acoustic feedback elimination module, configured to obtain a secondary acoustic feedback signal according to a path response between a playback device and the first sound collection device and the first signal within the third time unit;

The secondary acoustic feedback elimination module is further used to process the acoustic reference signal collected by the first sound collection device according to the secondary acoustic feedback signal, and eliminate the secondary acoustic feedback signal in the acoustic reference signal;

a noise reduction control module, configured to determine a first signal within a fourth time unit according to the processed acoustic reference signal;

The third time unit is earlier than the fourth time unit.
A computer program product, characterized in that it comprises computer program instructions, which enable a computer to execute the method as claimed in claim 13.
A computer-readable storage medium, characterized in that it is used to store computer program instructions, wherein the computer program enables a computer to execute the method as claimed in claim 13.
A chip, characterized in that it includes: a processor, used to call and execute computer instructions from a memory, so that a device equipped with the chip executes the method as claimed in claim 13.
An electronic device, characterized in that it comprises: a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method as claimed in claim 13.