阅读说明：本技术 降噪系统、方法以及车辆 (Noise reduction system, method and vehicle ) 是由 刘长青 高阳 赵靖州 樊康 徐金龙 于 2019-10-17 设计创作，主要内容包括：本申请涉及一种降噪系统、方法以及车辆。所述系统包括：传感器,用于采集目标区域的噪音信号；控制器,与所述传感器电连接,用于接收所述噪音信号,并根据所述噪音信号生成反噪声信号,其中,所述反噪声信号与所述噪声信号的振幅相同、相位相反；扬声器,与所述控制器电连接,用于接收所述反噪声信号,并输出所述反噪声信号。采用本系统能够提高降噪效率、降低成本的、且便捷。(The application relates to a noise reduction system, a method and a vehicle. The system comprises: the sensor is used for acquiring a noise signal of a target area; the controller is electrically connected with the sensor and is used for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases; and the loudspeaker is electrically connected with the controller and used for receiving the anti-noise signal and outputting the anti-noise signal. By adopting the system, the noise reduction efficiency can be improved, the cost can be reduced, and the system is convenient and fast.)

1. A noise reduction system, the system comprising:

the sensor is used for acquiring a noise signal of a target area;

the controller is electrically connected with the sensor and is used for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases;

and the loudspeaker is electrically connected with the controller and used for receiving the anti-noise signal and outputting the anti-noise signal.

2. The system of claim 1, wherein the controller comprises:

the signal amplifier is electrically connected with the sensor and is used for carrying out voltage amplification on the noise signal to obtain an amplified noise signal;

and the signal processor is electrically connected with the signal amplifier and used for carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

3. The system of claim 2, wherein the signal processor comprises:

the characteristic extraction module is used for extracting the characteristic information of the amplified noise signal;

the calculation module is electrically connected with the characteristic extraction module and is used for carrying out Fourier transform on the characteristic information to obtain a correlation matrix of the amplified noise signal;

the phase inversion module is electrically connected with the calculation module and is used for carrying out inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

and the determining module is electrically connected with the inverting module and used for determining the anti-noise signal according to the inverse matrix.

4. The system of claim 1, wherein the sensor comprises:

the acceleration sensor is used for acquiring vibration noise signals of a target area;

and the microphone sensor is used for acquiring an air noise signal of the target area.

5. The system of claim 1, wherein the speaker is plural.

6. The system according to claim 4 or 5, characterized in that one said loudspeaker matches one said acceleration sensor and one said microphone sensor.

7. A vehicle, characterized in that it comprises a noise reduction system according to any one of claims 1-6.

8. A method of noise reduction, the method comprising:

collecting a noise signal of a target area;

and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases.

9. The method of claim 8, wherein generating an anti-noise signal from the noise signal comprises:

performing voltage amplification on the noise signal to obtain an amplified noise signal;

and carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

10. The method of claim 9, wherein correlating the amplified noise signal to obtain an anti-noise signal comprises:

extracting characteristic information of the amplified noise signal;

carrying out Fourier transform on the characteristic information to obtain a correlation matrix of the amplified noise signal;

carrying out inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

and determining an anti-noise signal according to the inverse matrix.

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a noise reduction system, a noise reduction method, and a vehicle.

Background

With the improvement of living standard and the acceleration of life rhythm, the requirements of people on the quality of life are higher and higher, and particularly, a quiet living environment is needed.

In order to meet the demand of people, sound-absorbing materials such as soundproof partitions, soundproof fences, barriers, and silencers are generally used for general noise. But the noise of special tones is very annoying, such as low frequency noise has the characteristics of strong penetrability, long propagation distance, and difficult attenuation of traditional passive control. When the general technology is adopted to process low-frequency noise, the required material occupies a large volume, has low noise reduction efficiency and is expensive.

Disclosure of Invention

In view of the above, it is necessary to provide a noise reduction system, a method and a vehicle capable of improving noise reduction efficiency and reducing cost.

A noise reduction system, the system comprising:

the sensor is used for acquiring a noise signal of a target area;

the controller is electrically connected with the sensor and is used for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases;

and the loudspeaker is electrically connected with the controller and used for receiving the anti-noise signal and outputting the anti-noise signal.

In one embodiment, the controller comprises:

the signal amplifier is electrically connected with the sensor and is used for carrying out voltage amplification on the noise signal to obtain an amplified noise signal;

and the signal processor is electrically connected with the signal amplifier and used for carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

In one embodiment, the signal processor comprises:

the characteristic extraction module is used for extracting the characteristic information of the amplified noise signal;

the calculation module is electrically connected with the characteristic extraction module and is used for carrying out Fourier transform on the characteristic information to obtain a correlation matrix of the amplified noise signal;

the phase inversion module is electrically connected with the calculation module and is used for carrying out inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

and the determining module is electrically connected with the inverting module and used for determining the anti-noise signal according to the inverse matrix.

In one embodiment, the sensor comprises:

the acceleration sensor is used for acquiring vibration noise signals of a target area;

and the microphone sensor is used for acquiring an air noise signal of the target area.

In one embodiment, the speaker may be plural.

In one embodiment, one said speaker is matched to one said acceleration sensor and one said microphone sensor.

A vehicle comprising a noise reduction system as claimed in any one of the preceding claims.

A method of noise reduction, the method comprising:

collecting a noise signal of a target area;

and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases.

In one embodiment, the generating an anti-noise signal from the noise signal comprises:

performing voltage amplification on the noise signal to obtain an amplified noise signal;

and carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

In one embodiment, the performing a correlation calculation on the amplified noise signal to obtain an anti-noise signal includes:

extracting characteristic information of the amplified noise signal;

carrying out Fourier transform on the characteristic information to obtain a correlation matrix of the amplified noise signal;

carrying out inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

and determining an anti-noise signal according to the inverse matrix.

The noise reduction system, the noise reduction method and the vehicle comprise: the sensor is used for acquiring a noise signal of a target area; the controller is electrically connected with the sensor and is used for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases; and the loudspeaker is electrically connected with the controller and used for receiving the anti-noise signal and outputting the anti-noise signal. The system can improve the noise reduction efficiency, reduce the cost and is convenient and fast.

Drawings

FIG. 1 is a block diagram of a noise reduction system in one embodiment;

FIG. 2 is a diagram of an embodiment of an application environment of a noise reduction method;

FIG. 3 is a flow diagram of a method of noise reduction in one embodiment;

FIG. 4 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1, a noise reduction system, the system comprising:

the sensor 1 is used for acquiring a noise signal of a target area;

a controller 2 electrically connected to the sensor 1 for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal has the same amplitude and opposite phase to the noise signal;

and the loudspeaker 3 is electrically connected with the controller 2 and used for receiving the anti-noise signal and outputting the anti-noise signal.

Specifically, the target region refers to a fixed region set according to requirements, and may be a circular region, a rectangular region, or the like, and the specific shape and area are not limited.

In the present application, an Active Noise reduction method, i.e., Active Noise Control (ANC), is employed. The basic idea of active noise control has been proposed as early as 70 years ago (1933, Paul Lueg in germany): generating a signal with the same amplitude as the original noise but in opposite phase (anti-noise signal) will significantly reduce the noise level. According to the principle of superposition of waves, two waves of equal amplitude and phase have an additive effect, so that the overall amplitude is doubled. On the other hand, two waves of the same amplitude but opposite phase have a subtractive effect, resulting in a drop in the overall amplitude. The phase describes the relative position of the wave in the rising and falling periods. If the two waves are in phase, their rise and fall are relatively identical, but if the two waves are in opposite phase (i.e., one rises while the other falls), they will cancel. ANC attempts to cancel the original noise by adding the exact opposite sound. The degree of attenuation depends to a large extent on the accuracy of the system that generates the anti-noise signal amplitude and phase.

In one embodiment, the controller 2 includes:

the signal amplifier 21 is electrically connected with the sensor 1 and is used for carrying out voltage amplification on the noise signal to obtain an amplified noise signal;

and the signal processor 22 is electrically connected with the signal amplifier 21 and is used for carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

Specifically, the signal processor 22 integrates a noise reduction algorithm chip, mainly the Filtered-X LMS algorithm developed by Morgan, which is one of the most popular algorithms currently applied to controllers between a reference microphone and a speaker. The goal of this algorithm is to minimize the signal energy at the error correcting microphone.

In one embodiment, the signal processor 22 includes:

a feature extraction module 221, configured to extract feature information of the amplified noise signal;

a calculating module 222, electrically connected to the feature extracting module, configured to perform fourier transform on the feature information to obtain a correlation matrix of the amplified noise signal;

the phase inversion module 223 is electrically connected with the calculation module and is used for performing inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

a determining module 224, electrically connected to the inverting module, for determining an inverse noise signal according to the inverse matrix.

Specifically, white noise and Gaussian noise in the noise signal are extracted, the white noise and the Gaussian noise are both expressed in a matrix form, namely a matrix X and a matrix Y, and the matrix X and the matrix Y are combined into a new matrix T. And carrying out Fourier transform on the matrix T to obtain a correlation matrix J.

According to the correlation matrix J, solving the inverse matrix J of the correlation matrix^-。

In one embodiment, the sensor 1 comprises:

the acceleration sensor 11 is used for acquiring vibration noise signals of a target area;

a microphone sensor 12 for acquiring an air noise signal of the target area.

In one embodiment, the speaker 3 may be plural.

In one embodiment, one of the loudspeakers 3 is matched to one of the acceleration sensors 11 and one of the microphone sensors 12.

The above noise reduction system includes: the sensor is used for acquiring a noise signal of a target area; the controller is electrically connected with the sensor and is used for receiving the noise signal and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases; and the loudspeaker is electrically connected with the controller and used for receiving the anti-noise signal and outputting the anti-noise signal. The system can improve the noise reduction efficiency, reduce the cost and is convenient and fast.

A vehicle comprising a noise reduction system as described above.

The noise reduction method provided by the application can be applied to the application environment shown in fig. 2. Wherein the terminal 102 and the server 104 communicate via a network. The terminal 102 collects a noise signal of a target area and transmits the noise signal to the server 104, and the server 104 generates an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases. The terminal 102 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, and the server 104 may be implemented by an independent server or a server cluster formed by a plurality of servers.

In one embodiment, as shown in fig. 3, a noise reduction method is provided, which is illustrated by applying the method to the server 104 in fig. 2, and includes the following steps:

step S1: collecting a noise signal of a target area;

step S2: and generating an anti-noise signal according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases.

In one embodiment, the step S2 includes:

step S21: performing voltage amplification on the noise signal to obtain an amplified noise signal;

step S22: and carrying out correlation calculation on the amplified noise signal to obtain an anti-noise signal.

In one embodiment, the step S22 includes:

step S221: extracting characteristic information of the amplified noise signal;

step S222: carrying out Fourier transform on the characteristic information to obtain a correlation matrix of the amplified noise signal;

step S223: carrying out inverse operation on the correlation matrix to obtain an inverse matrix of the noise signal;

step S224: and determining an anti-noise signal according to the inverse matrix.

According to the noise reduction method, the noise signal of the target area is collected, and then the anti-noise signal is generated according to the noise signal, wherein the anti-noise signal and the noise signal have the same amplitude and opposite phases. The method can effectively improve the noise reduction efficiency, reduce the cost and is convenient and fast.

It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 4. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing noise related data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a noise reduction method.

Those skilled in the art will appreciate that the architecture shown in fig. 4 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.