CN118314869A

CN118314869A - Vehicle noise reduction method, domain controller, vehicle and readable storage medium

Info

Publication number: CN118314869A
Application number: CN202410735590.6A
Authority: CN
Inventors: 史琳; 范志富; 龚少波; 苏凯
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2024-06-07
Filing date: 2024-06-07
Publication date: 2024-07-09
Anticipated expiration: 2044-06-07
Also published as: CN118314869B

Abstract

The application discloses a vehicle noise reduction method, a domain controller, a vehicle and a readable storage medium, wherein external microphones are arranged at a plurality of positions of the vehicle, and the vehicle noise reduction method comprises the following steps: acquiring an external noise signal acquired by an external microphone of the vehicle, and acquiring an internal noise signal at a corresponding position of the vehicle according to a preset frequency response function at the corresponding position of the vehicle and the external noise signal acquired by the external microphone of the vehicle; and carrying out noise reduction processing on the noise signals in the vehicle at the corresponding positions. According to the technical scheme disclosed by the application, the noise reduction is performed by utilizing the preset frequency response function at the corresponding position of the vehicle, so that the adaptive noise reduction is performed by combining the characteristics of the current position of the vehicle, and the noise difference at different positions is eliminated, so that the noise reduction effect of the vehicle is improved, and a better silence effect is achieved.

Description

Vehicle noise reduction method, domain controller, vehicle and readable storage medium

Technical Field

The present application relates to the field of noise reduction technologies, and in particular, to a vehicle noise reduction method, a domain controller, a vehicle, and a readable storage medium.

Background

With the rapid development of the automobile industry, people have increasingly high requirements for automobile silence NVH (Noise, vibration, harshness, noise, vibration, comfort). One of the methods for improving silence of the whole car is to utilize an audio system of the whole car and realize the silence by an active noise reduction mode.

At present, when the noise of a vehicle is reduced, the noise of the whole vehicle is reduced by adopting a unified and fixed noise reduction algorithm, for example, a microphone in the vehicle is used for collecting sound, the collected sound is subjected to filtering processing by utilizing fixed filtering parameters, only a low-frequency band signal corresponding to the sound frequency of an engine is reserved, then the noise signal is subjected to reverse processing, the noise signal is played through a vehicle-mounted sound system, and the reverse noise signal is superposed with a forward noise signal to reduce the noise. Because the vehicle model, the material and the like are different, and the noise at different positions can be different, the noise reduction effect of the vehicle is poor due to the fact that the noise reduction algorithm which is unified and fixed is adopted for noise reduction.

In summary, how to improve the noise reduction effect of the vehicle is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present application is to provide a vehicle noise reduction method, a domain controller, a vehicle and a readable storage medium for improving the noise reduction effect of the vehicle.

In order to achieve the above object, the present application provides the following technical solutions:

A vehicle noise reduction method, externally mounted microphones at a plurality of positions of a vehicle, the vehicle noise reduction method comprising: acquiring an off-vehicle noise signal acquired by the off-vehicle microphone, and acquiring an in-vehicle noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and the off-vehicle noise signal acquired by the off-vehicle microphone; and carrying out noise reduction processing on the noise signals in the vehicle at the corresponding positions.

Optionally, when acquiring the noise signal outside the vehicle collected by the microphone outside the vehicle, the method further comprises: acquiring a reference signal of the sound inside the vehicle;

Before the noise reduction processing is performed on the in-vehicle noise signals at the corresponding positions, the method further comprises: and correcting the noise signal in the vehicle according to the reference signal to obtain the corrected noise signal in the vehicle.

Optionally, the vehicle interior is provided with an in-vehicle speaker;

Noise reduction processing is carried out on the noise signals in the vehicle at the corresponding positions, and the noise reduction processing comprises the following steps: and reversely processing the noise signal in the vehicle, and playing the reversely processed noise signal in the vehicle by utilizing the corresponding speaker in the vehicle.

Optionally, the inverse processing of the in-vehicle noise signal includes: and acquiring a noise reduction mode, and carrying out reverse processing on the noise signal in the vehicle according to the noise reduction mode.

Optionally, the noise reduction mode includes a complete silence mode, an ESE sound wave mode and a whistle audible mode, and the processing of the noise signal in the vehicle in reverse according to the noise reduction mode includes: when the noise reduction mode is a complete silence mode, carrying out reverse processing on sound signals of all frequency bands in the noise signals in the vehicle; when the noise reduction mode is an ESE sound wave mode, attenuating the sound signal of a first target frequency band in the in-vehicle noise signal, and carrying out reverse processing on the attenuated sound signal of the first target frequency band and the sound signals of other frequency bands in the in-vehicle noise signal; the first target frequency band is a frequency band corresponding to sound waves, or a frequency band corresponding to sound waves and a frequency band corresponding to whistling of other vehicles; when the noise reduction mode is a whistling audible mode, attenuating the sound signal of a second target frequency band in the in-vehicle noise signal, and carrying out reverse processing on the attenuated sound signal of the second target frequency band and the sound signals of other frequency bands in the in-vehicle noise signal; the second target frequency band is a frequency band corresponding to the whistle of other vehicles.

Optionally, acquiring a noise reduction mode, and performing inverse processing on the noise signal in the vehicle according to the noise reduction mode, where the method includes: and acquiring noise reduction modes of the positions corresponding to the microphones outside the vehicle, and carrying out reverse processing on the noise signals in the vehicle at the corresponding positions according to the noise reduction modes of the positions corresponding to the microphones outside the vehicle.

Optionally, an in-vehicle microphone is installed in an interior of the vehicle at a position corresponding to each of the in-vehicle microphones, and an out-vehicle speaker is also installed outside the vehicle, and the method further includes: controlling the external loudspeaker to emit sound signals with different frequencies, and controlling the external microphone and the internal microphone to collect sound signals with corresponding frequencies; and acquiring sound signals of corresponding frequencies acquired by the vehicle-exterior microphone and the vehicle-interior microphone, and acquiring a frequency response function preset at the corresponding position of the vehicle according to the sound signals of corresponding frequencies acquired by the vehicle-exterior microphone and the vehicle-interior microphone.

Optionally, the method further comprises: and returning to the step of controlling the off-board loudspeaker to emit sound signals with different frequencies at regular time so as to update the preset frequency response function at the corresponding position of the vehicle.

Optionally, controlling the off-vehicle speaker to emit sound signals of different frequencies includes: controlling the external loudspeaker to emit sound signals with different frequencies in a full frequency band according to a preset frequency interval; wherein, the interval between the sound signals of two adjacent frequencies is preset time interval.

Optionally, controlling the speaker outside the vehicle to emit sound signals with different frequencies further includes: and controlling the loudspeaker outside the vehicle to emit sound signals of each frequency for a plurality of times.

Optionally, the preset frequency response function is a corresponding relation between each frequency and the gain of the sound amplitude inside and outside the vehicle; the in-car and out-of-car sound amplitude gain is the ratio of the amplitude of the sound signal collected by the in-car microphone to the amplitude of the sound signal collected by the corresponding out-of-car microphone; or the preset frequency response function is a relation function between the frequency of the sound signal and the gain of the sound amplitude inside and outside the vehicle.

A domain controller externally mounted on-vehicle microphones at a plurality of locations of a vehicle, the domain controller being connected to the off-vehicle microphones, the domain controller being for implementing the steps of the vehicle noise reduction method as claimed in any one of the preceding claims.

Optionally, the domain controller includes a control unit, a noise reduction DSP and an audio DSP connected to the control unit, a switch connected to the control unit and the noise reduction DSP, and a memory connected to the switch, where the noise reduction DSP is connected to the audio DSP, and the audio DSP is connected to the microphone outside the vehicle through a first ADC, where: the memory is used for storing preset frequency response functions at the corresponding positions of the microphones outside the vehicle; the control unit is used for controlling the off-vehicle microphone to collect off-vehicle noise signals, acquiring the off-vehicle noise signals collected by the off-vehicle microphone, and controlling the change-over switch to be switched to the noise reduction DSP so that the noise reduction DSP can acquire a preset frequency response function at the corresponding position of the vehicle from the memory; the noise reduction DSP is used for obtaining an in-vehicle noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and an out-of-vehicle noise signal acquired by the out-of-vehicle microphone, and performing noise reduction processing on the in-vehicle noise signal at the corresponding position.

Optionally, an in-vehicle speaker is installed in the vehicle, and the audio DSP is connected with the in-vehicle speaker through a first power amplifier; the noise reduction DSP is specifically configured to perform reverse processing on the noise signal in the vehicle, send the noise signal in the vehicle after reverse processing to the speaker in the vehicle through the audio DSP and the first power amplifier, and play the noise signal in the vehicle after reverse processing by the speaker in the vehicle.

Optionally, each of the vehicle-mounted microphones is mounted in a vehicle-mounted microphone at a position corresponding to the vehicle-mounted microphone, an external speaker is mounted outside the vehicle, the vehicle-mounted microphone is connected with the audio DSP through a second ADC, and the external speaker is connected with the audio DSP through a second power amplifier, wherein: the control unit is further configured to control the audio DSP to perform sweep frequency sounding on the speaker outside the vehicle, so that the speaker outside the vehicle emits sound signals with different frequencies, control the microphone outside the vehicle and the microphone inside the vehicle to collect sound signals with corresponding frequencies, obtain the sound signals with corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle through the first ADC, the second ADC and the audio DSP, obtain a preset frequency response function at a corresponding position of the vehicle according to the sound signals with corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle, and connect the memory through controlling the switch, so that the preset frequency response function at the corresponding position of the vehicle is stored in the memory.

A vehicle having externally mounted vehicle exterior microphones at a plurality of locations, the vehicle being for implementing the steps of the vehicle noise reduction method as set forth in any one of the above.

Optionally, an in-car microphone is installed in the vehicle at a position corresponding to each out-car microphone, and an out-car speaker is also installed outside the vehicle.

A readable storage medium having stored therein a computer program which, when executed by a processor, implements the steps of the vehicle noise reduction method as defined in any one of the preceding claims.

The application provides a vehicle noise reduction method, a domain controller, a vehicle and a readable storage medium, wherein external microphones are arranged at a plurality of positions of the vehicle, and the vehicle noise reduction method can comprise the following steps: acquiring an external noise signal acquired by an external microphone of the vehicle, and acquiring an internal noise signal at a corresponding position of the vehicle according to a preset frequency response function at the corresponding position of the vehicle and the external noise signal acquired by the external microphone of the vehicle; and carrying out noise reduction processing on the noise signals in the vehicle at the corresponding positions.

According to the technical scheme disclosed by the application, the noise reduction is performed by acquiring and utilizing the preset frequency response function at the corresponding position of the vehicle, and the noise reduction can be performed by combining the characteristics of the current position of the vehicle through the process, so that the noise reduction effect is improved. And because of differences of vehicle modeling, vehicle materials and the like, the preset frequency response functions at different positions of the vehicle are different, so that noise can be reduced adaptively at different positions of the vehicle based on the preset frequency response functions at corresponding positions of the vehicle, noise differences at different positions can be eliminated, the noise reduction effect of the vehicle can be improved, a better silent effect can be achieved, and the experience of a user is improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.

Drawings

FIG. 1 is a flow chart of a conventional vehicle noise reduction;

FIG. 2 is a flow chart of a method for reducing noise in a vehicle according to an embodiment of the present application;

FIG. 3 is a flowchart of a noise reduction process in different noise reduction modes according to an embodiment of the present application;

Fig. 4 is a schematic distribution diagram of an in-vehicle microphone and an out-vehicle speaker according to an embodiment of the present application;

Fig. 5 is a schematic diagram of a preset frequency response function of a corresponding position acquired by a plurality of pairs of microphones according to an embodiment of the present application;

FIG. 6 is a graph illustrating a frequency response function according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a vehicle noise reduction device according to an embodiment of the present application;

Fig. 8 is a system frame diagram of noise reduction of a vehicle according to an embodiment of the present application.

Detailed Description

With the development of the automobile industry, people have higher and higher requirements on vehicle silence NVH, and various methods for improving the silence of the whole automobile exist, wherein one method is realized by utilizing an audio system of the whole automobile in an active noise reduction mode. For example, as shown in fig. 1, the noise reduction flow chart of the conventional vehicle is that a microphone in the vehicle is used for collecting sound, a filter circuit is used for filtering the collected sound, only a low-frequency domain signal corresponding to the sound frequency of an engine is reserved, the obtained low-frequency domain signal is subjected to analog-digital conversion, the noise signal is reversely processed in combination with the state of the whole vehicle, such as the rotation speed of the engine, the speed of the vehicle and the like, and is played through a vehicle-mounted sound system, and the reverse noise signal is overlapped with a forward noise signal to eliminate noise. The noise reduction algorithm is that the whole vehicle uses a uniform and fixed algorithm to reduce noise, and the noise reduction effect is poor.

Therefore, the application provides a vehicle noise reduction method, a domain controller, a vehicle and a readable storage medium, which are used for improving the noise reduction effect so as to achieve better silence effect.

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.

Referring to fig. 2, a flowchart of a vehicle noise reduction method according to an embodiment of the present application is shown. The vehicle noise reduction method provided by the embodiment of the application is that external microphones are arranged at a plurality of positions of a vehicle, and an internal speaker is arranged in the vehicle, and the vehicle noise reduction method can comprise the following steps:

S11: and acquiring an external noise signal acquired by an external microphone of the vehicle, and acquiring an internal noise signal at a corresponding position of the vehicle according to a preset frequency response function at the corresponding position of the vehicle and the external noise signal acquired by the external microphone of the vehicle.

It should be noted that, the execution body of the vehicle noise reduction method provided by the embodiment of the present application may be a vehicle or a vehicle cabin system, and specifically may be a domain controller in the vehicle cabin system, or of course, may be another domain controller in the vehicle.

Wherein, the outside of a plurality of positions on the vehicle is installed with the external microphone, specifically, can be according to the motorcycle type of vehicle the external microphone of the external installation of a plurality of positions of vehicle, and for the convenience of external microphone wiring, can adopt A2B (Automotive Audio Bus, car audio bus) daisy chain to connect between the external microphone of car. Specifically, an external microphone may be installed outside the left and right positions of each row of seats of the vehicle, so as to reduce noise at each seat, for example, for three rows of 6-seat vehicles or 7-seat vehicles, an external microphone may be installed outside the left and right positions of the front, middle and rear three rows of the vehicle, respectively (specifically, may be uniformly distributed at the left and right positions of the front, middle and rear three rows of the vehicle), where the external microphone may be specifically installed at the door handle position or the window hidden position of the vehicle, so as to facilitate accurate sound collection, and of course, the external microphone may be disposed at other positions outside the vehicle according to the noise reduction requirements of the user or the experience of the related personnel. The accuracy to noise collection can be improved through the outside microphone of vehicle external mounting to in order to improve the vehicle noise reduction effect, can realize handling respectively the noise of the different positions department in the car through the outside microphone of external mounting in the different positions department of vehicle moreover, in order to eliminate the noise difference of different positions department, thereby improve the vehicle noise reduction effect, and then reach better silence effect.

Before the noise reduction of the vehicle, a preset frequency response function H (w) at each corresponding position on the vehicle (namely, at each position corresponding to the microphone outside the vehicle, namely, at each installation position of the microphone outside the vehicle) can be obtained in advance, and the preset frequency response function can be a frequency response function of a full frequency band (20 hz-20 khz). Due to differences in vehicle modeling, materials and the like, preset frequency response functions at different positions of the vehicle are different, and noise reduction based on the preset frequency response functions at different positions of the vehicle can improve the noise reduction effect of the vehicle so as to achieve better silence effect. Taking three rows of 6-seat vehicles or 7-seat vehicles and respectively installing one out-of-vehicle microphone outside the left and right positions of the front, middle and rear three rows of vehicles as an example, the preset frequency response functions H (w) of the 6 positions on the vehicle can be respectively expressed as H ₁(w)、H₂(w)、H₃(w)、H₄(w)、H₅(w)、H₆ (w), and the preset frequency response functions H (w) of the 6 positions are different due to the differences of the 6 positions, the shapes, the materials and the like of the vehicles.

After the vehicle starts or starts running, the domain controller can control the off-vehicle microphones at all positions to collect off-vehicle noise signals in real time. Each of the off-vehicle microphones may transmit the collected off-vehicle noise signal to the domain controller after collecting the off-vehicle noise signal, and the domain controller performs Analog-to-digital conversion on the off-vehicle noise signal using an ADC (Analog-to-Digital Converter). When the plurality of off-vehicle microphones send the collected off-vehicle noise signals to the domain controller, the plurality of off-vehicle microphones can transmit the collected off-vehicle noise signals by utilizing a plurality of time slots of a TDM (Time Division Multiplexing time division multiplexing) channel.

And, when the domain controller controls the off-vehicle microphones at each position to collect the off-vehicle noise signals, the sampling rate of the off-vehicle noise signals (the sampling rate is greater than 2 times of the highest frequency of the signals) can be controlled according to the nyquist sampling theorem, so that the frequencies contained in the off-vehicle noise signals can be obtained through high-frequency sampling, for example, when a 20 Hz-20 kHz frequency band is sampled, the ADC sampling rate needs to be above 40kHz, and of course, the sampling rate can be adjusted according to the actual application and the noise reduction frequency band, for example, the application of not reducing noise to the frequency band above 10kHz is required, the sampling rate needs to be above 20kHz, and the domain controller can obtain the frequency spectrum of the off-vehicle noise signals in real time through high-frequency sampling, namely, the frequencies contained in the off-vehicle noise signals collected by the off-vehicle microphones can be obtained.

After acquiring the noise signals collected by the microphones outside the vehicle, the domain controller can calculate the noise signals collected by the microphones outside the vehicle and preset frequency response functions (specifically, preset frequency response functions at the positions corresponding to the microphones outside the vehicle) at the corresponding positions of the vehicle to obtain the noise signals inside the vehicle at the corresponding positions. That is, the noise signals outside the vehicle collected by the microphones outside the vehicle at the respective positions are respectively calculated with the preset frequency response function at the respective positions to correspondingly obtain the noise signals outside the vehicle at the respective positions, and the noise signals outside the vehicle are respectively transmitted to the sounds (i.e., the noise signals inside the vehicle) at the respective positions inside the vehicle after the noise signals outside the vehicle are isolated by the vehicle.

Through the outside at the outside installation car outside microphone of vehicle, utilize outside car microphone to gather outside the car noise signal can reduce the influence of interior sound to outside the car noise collection, improve the accuracy to outside the car noise collection to improve the vehicle and make an uproar effect of falling.

S12: and carrying out noise reduction processing on the noise signals in the vehicle at the corresponding positions.

After the in-vehicle noise signals at the respective corresponding positions are obtained through step S12, the in-vehicle noise signals at the respective corresponding positions may be subjected to noise reduction processing.

Taking three rows of 6 seats or 7 seats and respectively installing one out-of-car microphone outside the left and right positions of the front, middle and rear three rows of vehicles as an example, the out-of-car noise signals collected by the out-of-car microphones at the 6 positions can be respectively calculated with corresponding preset frequency response functions to obtain in-car noise signals which are transmitted to corresponding positions in the vehicle after the out-of-car noise is isolated by the vehicle, noise reduction treatment can be carried out on the in-car noise signals at the corresponding positions in the vehicle, and the in-car noise signals at the corresponding positions are eliminated.

Compared with the existing whole vehicle which uses a unified and fixed noise reduction treatment mode to reduce noise, the noise reduction method has the advantages that the noise at the corresponding position in the vehicle is respectively treated by utilizing the preset frequency response function at the different positions of the vehicle and the externally installed microphone outside the vehicle, so that the noise difference at the different positions is eliminated, the noise reduction effect of the vehicle is improved, and further, a better silent effect is achieved. Compared with the method that the vehicles of all the vehicle types adopt a unified and fixed noise reduction algorithm to reduce noise, the method and the device can realize adaptive noise reduction on different positions of different vehicles through the process, so that the noise reduction effect of the vehicles can be improved, the vehicles can achieve better silence, and the user experience is improved.

According to the technical scheme disclosed by the embodiment of the application, the noise reduction is performed by acquiring and utilizing the preset frequency response function at the corresponding position of the vehicle, and the noise reduction can be performed by combining the characteristics of the current position of the vehicle through the process, so that the noise reduction effect is improved. And because of differences of vehicle modeling, vehicle materials and the like, the preset frequency response functions at different positions of the vehicle are different, so that noise can be reduced adaptively at different positions of the vehicle based on the preset frequency response functions at corresponding positions of the vehicle, noise differences at different positions can be eliminated, the noise reduction effect of the vehicle can be improved, a better silent effect can be achieved, and the experience of a user is improved.

The method for reducing noise of the vehicle provided by the embodiment of the application can further comprise the following steps when the noise signal of the outside of the vehicle, which is acquired by the microphone outside the vehicle, is acquired:

acquiring a reference signal of sound inside the vehicle;

before the noise reduction processing is performed on the noise signals in the vehicle at the corresponding positions, the method may further include:

And correcting the noise signal in the vehicle according to the reference signal to obtain a corrected noise signal in the vehicle.

In the embodiment of the application, considering that if the sound in the vehicle is large, the microphone outside the vehicle may collect the sound in the vehicle, such as music played in the vehicle, speaking of a person in the vehicle, etc., if the microphone outside the vehicle collects the sound in the vehicle, the noise signal outside the vehicle collected by the microphone outside the vehicle also contains the sound signal inside the vehicle, so as to avoid the influence of the sound signal inside the vehicle on noise reduction of the vehicle, the sound inside the vehicle needs to be subtracted as an audio reference signal. Specifically, the reference signal of the sound inside the vehicle may be obtained while the noise signal outside the vehicle collected by the microphone outside the vehicle is obtained, wherein the sound inside the vehicle includes the sound playing music and/or the sound uttered by the person, specifically the first reference signal REF1 of the sound playing music of the vehicle may be provided by the cabin main machine, the second reference signal REF2 of the sound uttered by the person inside the vehicle is collected by the microphone inside the vehicle, and the reference signal REF of the sound inside the vehicle is obtained by ref=ref1+ref2.

After acquiring a reference signal REF of the sound inside the vehicle and obtaining an in-vehicle noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and an out-of-vehicle noise signal acquired by an out-of-vehicle microphone, before performing noise reduction processing on the in-vehicle noise signal at the corresponding position, the in-vehicle noise signal may be corrected according to the acquired reference signal of the sound inside the vehicle, specifically, the obtained in-vehicle noise signal is subtracted by k×ref to obtain a corrected in-vehicle noise signal, and then, noise reduction processing may be performed on the corrected in-vehicle noise signal, where K is a proportionality coefficient, and the proportionality coefficient may be obtained through test calibration in a vehicle development stage. Taking the in-vehicle noise signal as a×h (w) as an example, the in-vehicle noise signal may be corrected using a×h (w) -kxref, and then the corrected in-vehicle noise signal may be obtained as a×h (w) -kxref, and then the noise reduction process may be performed on a×h (w) -kxref.

The influence of the sound in the vehicle on the noise reduction of the vehicle can be eliminated through the process, so that the noise reduction effect of the vehicle is further improved.

According to the vehicle noise reduction method provided by the embodiment of the application, a vehicle speaker is arranged in a vehicle;

noise reduction processing is performed on the noise signals in the vehicle at the corresponding positions, and the noise reduction processing may include:

and reversely processing the noise signals in the vehicle, and playing the reversely processed noise signals in the vehicle by utilizing the corresponding loudspeakers in the vehicle.

The vehicle interior may be equipped with an in-vehicle speaker, and may specifically be a multichannel in-vehicle speaker, and the in-vehicle speaker may specifically be distributed in the vicinity of an in-vehicle target position (the target position corresponds to an in-vehicle microphone installation position) so as to achieve active noise reduction based on the in-vehicle speaker.

On the basis of the above, the noise reduction processing for the noise signals in the vehicle at the corresponding positions may specifically be: reversely processing the noise signals in the vehicle at the corresponding positions to obtain reversely processed noise signals in the vehicle at the corresponding positions respectively; then, the back-processed in-car noise signal is sent to the in-car speaker at the corresponding position (specifically, the back-processed in-car noise signal can be transmitted to the in-car speaker corresponding to each position by using the TDM channel), the back-processed in-car noise signal is played by using the in-car speaker at the corresponding position, so that the played back-processed in-car noise signal is overlapped with the in-car noise signal at the corresponding position after the back-processed in-car noise signal is isolated from the corresponding position by the car, that is, the back-processed in-car noise signal played by the nearby in-car speaker is overlapped with the in-car noise signal which arrives in the car after the back-processed in-car noise signal is isolated from the car, and the in-car noise signal at the corresponding position is eliminated.

The preset frequency response function H (w) at each corresponding position of the vehicle may specifically be a relationship between the amplitude of the sound signal in the vehicle, the ratio of the amplitude of the sound signal outside the vehicle, and the frequency of the sound signal. Correspondingly, according to a preset frequency response function at a corresponding position of the vehicle and an external noise signal acquired by an external microphone, the obtaining of the internal noise signal at the corresponding position can be specifically: for the external microphone at each position, the amplitude a and the frequency w ₀ of the external noise signal are obtained from the external noise signal collected by the external microphone, the amplitude gain H (w ₀) of the internal and external sound corresponding to the frequency w ₀ of the external noise signal collected by the external microphone is obtained according to the frequency w ₀ of the external noise signal collected by the external microphone and the preset frequency response function H (w) at the corresponding position of the vehicle, then the amplitude B of the internal noise signal at the corresponding position is obtained by using b=a×h (w ₀), that is, the amplitude of the sound (i.e. the internal noise signal) at each corresponding position in the vehicle can be obtained by calculating the external noise signal collected by the external microphone at each position of the vehicle with the preset frequency response function at each position. On the basis of the above, the inverse processing of the in-vehicle noise signal may specifically be performing an inverse operation on the magnitude of the in-vehicle noise signal, so as to obtain the magnitude of the in-vehicle noise signal after the inverse processing, that is, obtain the inverse noise magnitude played by the in-vehicle speaker at the corresponding position. For example, the amplitude of the noise signal outside the vehicle at a certain frequency w is a, the corresponding amplitude B of the noise signal inside the vehicle is obtained by using b=a×h (w), and then the inverse processing is performed to obtain-B, namely the amplitude of the noise signal inside the vehicle after the inverse processing.

Taking three rows of 6 seats or 7 seats and respectively installing one out-of-car microphone outside the left and right positions of the front, middle and rear three rows of vehicles as an example, out-of-car noise signals collected by the out-of-car microphones at the 6 positions can be respectively calculated with corresponding frequency response functions to obtain the sound amplitude of the out-of-car noise transmitted to each corresponding position in the vehicle after being isolated by the vehicle, the sound amplitude of each corresponding position in the vehicle can be reversely processed, and then the sound amplitude is played through the in-vehicle speakers at each position, so that the reverse sound played by the near speakers is heard by passengers at the front, middle and rear three rows of leaning windows to be overlapped with the noise after the noise at the position is isolated by the vehicle, and the noise is eliminated.

The method for reducing noise of a vehicle provided by the embodiment of the application can be used for carrying out reverse processing on noise signals in the vehicle, and can comprise the following steps:

and acquiring a noise reduction mode, and carrying out reverse processing on the noise signals in the vehicle according to the noise reduction mode.

In the embodiment of the present application, a plurality of noise reduction modes may be preset, and each noise reduction mode may not perform noise reduction processing or may not completely perform noise reduction processing on a sound signal of a specific frequency band in a full frequency band (if the noise reduction processing is not performed completely, a person in a vehicle hears a sound signal of a specific frequency band after attenuation), and may completely perform noise reduction processing on a sound signal of a frequency band other than the specific frequency band. The specific frequency band corresponding to each noise reduction mode can be set according to the user requirement, and the specific frequency bands between the noise reduction modes can have the same part. In addition, the preset noise reduction mode can be displayed on a display screen in the vehicle and/or a mobile terminal connected with the vehicle, etc., so that the user can select the noise reduction mode.

When the in-vehicle noise signal is reversely processed, the noise reduction mode may be acquired first, then, the in-vehicle noise signal may be reversely processed according to the noise reduction mode, specifically, the sound signal of the target frequency band corresponding to the specific frequency band in the noise reduction mode in the in-vehicle noise signal may be firstly subjected to attenuation processing, then, the sound signal of the target frequency band after the attenuation processing and the sound signal outside the target frequency band contained in the in-vehicle noise signal are reversely processed, so that the sound signal of the target frequency band is not subjected to noise reduction or is subjected to partial noise reduction, and therefore, the sound signal of the frequency band (i.e., the target frequency band) which is desired to be reserved under the noise reduction condition may be reserved, so that the user may hear the sound signal of the frequency band which is desired to be reserved, and further, the requirement of the user is well satisfied.

Through the process, different noise reduction treatments can be carried out on the sound signals of different frequency bands according to different noise reduction modes of the vehicle, and the noise reduction treatment is avoided on the sound signals of the fixed frequency bands only, so that the flexibility of the noise reduction treatment is improved, the requirements of users are well met, and the user experience is improved.

Referring to fig. 3, a flowchart of a noise reduction process in different noise reduction modes according to an embodiment of the present application is shown. The noise reduction method for a vehicle provided by the embodiment of the application can include a complete silence mode, an ESE (electronic service Equipment) sound wave mode and a whistling audible mode, and can be used for carrying out reverse processing on noise signals in the vehicle according to the noise reduction mode, and the method can include the following steps:

when the noise reduction mode is a complete silence mode, carrying out reverse processing on sound signals of all frequency bands in the noise signals in the vehicle;

When the noise reduction mode is an ESE sound wave mode, attenuating the sound signals of a first target frequency band in the noise signals in the vehicle, and carrying out reverse processing on the attenuated sound signals of the first target frequency band and the sound signals of other frequency bands in the noise signals in the vehicle; the first target frequency band is a frequency band corresponding to sound waves, or a frequency band corresponding to sound waves and a frequency band corresponding to whistling of other vehicles;

When the noise reduction mode is a whistling audible mode, attenuating the sound signal of a second target frequency band in the noise signal in the vehicle, and carrying out reverse processing on the sound signal of the attenuated second target frequency band and the sound signals of other frequency bands in the noise signal in the vehicle; the second target frequency band is a frequency band corresponding to the whistle of the other vehicle.

In the embodiment of the present application, the preset noise reduction modes may specifically include a completely silent mode, an ESE (Engine Sound Enhance, engine sound enhancement mode) sound wave mode, and a whistling audible mode. The complete silence mode is to completely reduce noise of sound in a full frequency band so as to reduce external noise to the minimum in the vehicle, and can be suitable for scenes such as sleeping or sleeping of a person in the vehicle; the ESE sound wave mode is used for carrying out no noise reduction or partial noise reduction on sound waves, carrying out no noise reduction or partial noise reduction on whistle, carrying out complete noise reduction treatment on the sound of the residual frequency band in the full frequency band sound, so that people in the vehicle can hear sound waves outside the vehicle and whistle sounds (other sounds outside the vehicle are denoised), in this case, the sound waves and the whistle sounds heard by the people in the vehicle are sound waves and whistle sounds isolated by the vehicle, wherein the sound waves heard by the people in the vehicle can create more pure and dynamic engine sounds under the noise reduction condition, the driving feeling of the people in the vehicle is enhanced, and the sound whistle sounds outside the vehicle can play a role of reminding and warning for the people in the vehicle under the noise reduction condition, so that the safety of the people and the driving is ensured; the whistling audible mode is to make no noise reduction or partial noise reduction on the whistling of other vehicles, and completely make noise reduction on the sounds of the remaining frequency bands in the full-frequency band sounds, so that the whistling sounds of other vehicles outside the vehicle can be heard by the personnel in the vehicle, and the personnel in the vehicle can be reminded and warned. Of course, other noise reduction modes may be set according to the user's needs.

Specifically, when the noise reduction mode is the complete silence mode, the sound signals of all frequency bands in the in-vehicle noise signal can be subjected to the inverse processing. That is, when the noise reduction mode is the full silence mode, the noise reduction is performed on the full frequency band, specifically, the full frequency band is [20Hz,20kHz ], and at this time, -A×H _n (w) can be used to perform the inverse processing on the sound signal of the full frequency band, wherein the value range of w is [20Hz,20kHz ].

When the noise reduction mode is the ESE sound wave mode, the sound signal of the first target frequency band (the first target frequency band can be the frequency band corresponding to sound waves, or the first target frequency band is the frequency band corresponding to sound waves and the frequency band corresponding to whistles of other vehicles) in the noise signal of the vehicle can be attenuated, and the sound signal of the attenuated first target frequency band and the sound signals of other frequency bands in the noise signal of the vehicle are reversely processed, so that the sound signal of the first target frequency band is not subjected to noise reduction processing or is subjected to partial noise reduction processing through the attenuation of the sound signal of the first target frequency band in the noise signal of the vehicle, and thus, the vehicle interior personnel can hear the unattenuated or the sound wave sound after attenuation, whistling sound. that is, when the noise reduction mode is the ESE sound wave mode, the noise reduction processing is not performed or is not performed completely on the sound signal corresponding to the first target frequency band, so that the sound wave and the whistle after being not attenuated or attenuated can be heard by the personnel in the vehicle. The frequency band corresponding to the sound wave is represented by (w ₀,w₁), at this time, the sound signal corresponding to (w ₀,w₁) (i.e., the sound signal corresponding to the sound wave, i.e., the sound wave sound signal) can be attenuated by using K ₀×A×H_n (w), and the inverse processing of the sound signal corresponding to (w ₀,w₁) can be represented by-K ₀×A×H_n (w), Wherein the value range of w is (w ₀,w₁),K₀ is the attenuation coefficient of the frequency band corresponding to the sound waves, 0 is less than or equal to K ₀<1,K₀ is equal to 0, which means that the sound wave sound signals in the noise signals in the vehicle are completely attenuated, namely that the sound wave sound signals in the noise signals in the vehicle are not reduced in noise, the greater K ₀ means that the attenuation degree of the sound wave sound signals is smaller (K ₀ is equal to 1, which means that the sound wave sound signals are not attenuated), that is, the greater the degree of noise reduction of the sound wave signal in the noise signal in the vehicle. The frequency band corresponding to the whistle is denoted by (w ₂,w₃), in which case the sound signal corresponding to (w ₂,w₃) (i.e., the sound signal corresponding to the whistle, i.e., the whistle sound signal) may be attenuated by K ₁×A×H_n (w), the inverse processing of the sound signal corresponding to (w ₂,w₃) may be denoted by-K ₁×A×H_n (w) to (w ₂,w₃), Wherein the value range of w is (w ₂,w₃),K₁ is the attenuation coefficient of the frequency band corresponding to the whistle, 0 is less than or equal to K ₁<1,K₁ is equal to 0, which means that the whistle sound signal in the noise signal in the vehicle is completely attenuated, that is, the whistle sound signal in the noise signal in the vehicle is not reduced in noise, the larger K ₁ means that the attenuation degree of the whistle sound signal in the noise signal in the vehicle is smaller, That is, the greater the degree of noise reduction of the whistling sound signal in the in-vehicle noise signal; The sound signals corresponding to the other frequency bands except (w ₀,w₁) and (w ₂,w₃) in the full frequency band [20Hz,20kHz ] are not attenuated, and noise reduction is completely carried out, namely, the sound signals corresponding to the other frequency bands except (w ₀,w₁) and (w ₂,w₃) in the full frequency band [20Hz,20kHz ] can be processed reversely by-A×H _n (w).

When the noise reduction mode is the whistle audible mode, the sound signal of the second target frequency band (namely, the frequency band corresponding to the whistle of other vehicles) in the noise signal in the vehicle can be attenuated, and the sound signal of the attenuated second target frequency band and the sound signals of other frequency bands in the noise signal in the vehicle are reversely processed, so that the sound signal of the second target frequency band is not subjected to noise reduction processing or is subjected to partial noise reduction processing through the attenuation of the sound signal of the second target frequency band in the noise signal in the vehicle, and therefore, the person in the vehicle can hear the whistle sound which is not attenuated or attenuated. Here, the process of attenuating the sound signals of the frequency bands corresponding to the whistle of the other vehicle may be referred to as the above process, and will not be described herein, in the whistle audible mode, the sound signals of the frequency bands corresponding to the frequency bands except (w ₂,w₃) in the full frequency band [20hz,20khz ] are not attenuated, and the noise reduction is performed completely, that is, the inverse process of the sound signals of the frequency bands corresponding to the frequency bands except (w ₂,w₃) in the full frequency band [20hz,20khz ] may be performed by-a×h _n (w).

By the method, the noise reduction processing of different degrees on the sound signals of different frequency bands based on different noise reduction modes can be realized, so that the frequency bands which are expected to be reserved are reserved, but not completely eliminated, the noise reduction effect of the vehicle is further improved, and the requirements of users are better met.

The method for reducing noise of a vehicle provided by the embodiment of the application obtains the noise reduction mode, and carries out reverse processing on the noise signal in the vehicle according to the noise reduction mode, which can comprise the following steps:

And acquiring noise reduction modes at corresponding positions of all the external microphones on the vehicle, and carrying out reverse processing on the noise signals in the vehicle at the corresponding positions according to the noise reduction modes at the corresponding positions of all the external microphones on the vehicle.

In the embodiment of the application, a user can set different noise reduction modes for different positions of the vehicle according to own requirements, as shown in fig. 3, the user can select a seat n which needs to be noise reduced independently, if the seat n is in a completely silent mode, if the seat n is in a whistling audible mode or an ESE (ESE) acoustic wave mode, so that the domain controller can perform different noise reduction treatments on different positions of the vehicle, thereby improving the diversity and flexibility of the noise reduction treatment of the vehicle, better meeting the user requirements and improving the user experience. Specifically, the domain controller may acquire a noise reduction mode at a position corresponding to each of the off-vehicle microphones on the vehicle, and then may perform inverse processing corresponding to the corresponding noise reduction mode on the in-vehicle noise signal at the corresponding position of the vehicle according to the noise reduction mode at the position corresponding to each of the off-vehicle microphones on the vehicle, so as to implement different noise reduction processing on different positions of the vehicle.

Referring to fig. 4 to 5, fig. 4 shows a schematic distribution diagram of an in-vehicle microphone and an out-vehicle speaker according to an embodiment of the present application, and fig. 5 shows a schematic preset frequency response function diagram of corresponding positions acquired by a plurality of pairs of microphones according to an embodiment of the present application. The vehicle noise reduction method provided by the embodiment of the application is characterized in that the interior of the vehicle at the corresponding position of each vehicle exterior microphone is provided with the vehicle interior microphone, the exterior of the vehicle is also provided with the vehicle exterior speaker, and the method can further comprise the following steps:

controlling an external loudspeaker to emit sound signals with different frequencies, and controlling an external microphone and an internal microphone to collect sound signals with corresponding frequencies;

And acquiring sound signals of corresponding frequencies acquired by the external microphone and the internal microphone, and acquiring a preset frequency response function at the corresponding position of the vehicle according to the sound signals of corresponding frequencies acquired by the external microphone and the internal microphone.

In the embodiment of the application, the vehicle interior microphones are respectively arranged in the positions corresponding to the vehicle exterior microphones on the vehicle, namely the vehicle exterior microphones and the vehicle interior microphones are respectively arranged outside and inside the same position of the vehicle, the vehicle exterior microphones and the vehicle interior microphones are in one-to-one correspondence to form a plurality of pairs of microphones, the vehicle exterior microphones are used for collecting vehicle exterior sounds at the corresponding positions, and the vehicle interior microphones are used for collecting vehicle interior sounds at the corresponding positions, so that a preset frequency response function at each corresponding position (namely the positions where each pair of microphones are respectively positioned) of the vehicle is conveniently obtained based on the plurality of pairs of microphones. For a three-row seat vehicle, 6 out-of-vehicle microphones can be uniformly distributed at left and right positions outside the front, middle and rear rows of the vehicle, the out-of-vehicle microphones can be mounted at hidden positions of the out-of-vehicle door handle or the window, and correspondingly, 6 in-vehicle microphones can be mounted, the 6 in-vehicle microphones are uniformly distributed at left and right positions inside the front, middle and rear rows of the vehicle, and the 6 in-vehicle microphones respectively form 6 pairs of microphones with the corresponding out-of-vehicle microphones.

In addition, an external speaker is mounted on the outside of the vehicle, and the external speaker may be mounted on the front of the vehicle, but may be mounted on the rear of the vehicle or at another position on the outside of the vehicle. Specifically, an AVAS (electric vehicle warning system) speaker may be used as an external speaker, that is, the external speaker may be used for an AVAS function, and the sound emission frequency of the external speaker covers 20Hz-20kHz.

The domain controller may obtain the preset frequency response function at the location of each pair of microphones on the vehicle by controlling the off-board speaker, the on-board microphone, and the off-board microphone. Specifically, the domain controller may control the off-vehicle speaker to continuously emit sound signals of different frequencies (the frequency range may be a full frequency band) to implement the frequency sweep. The intensity of sound signals with various frequencies emitted by the loudspeaker outside the vehicle can be kept unchanged, so that the accuracy of acquiring the preset frequency response function is improved.

And the domain controller can control the external microphones and the internal microphones to collect the sound signals with corresponding frequencies when or after the external speakers are controlled to emit the sound signals with one frequency, namely the external microphones and the internal microphones at the same position respectively collect the sound signals with corresponding frequencies. Accordingly, the domain controller may acquire sound signals of corresponding frequencies acquired by the external microphone and the internal microphone, perform analog-to-digital conversion on the sound signals of corresponding frequencies acquired by the external microphone and the internal microphone, perform operation on the sound signals of corresponding frequencies, and obtain a preset frequency response function at a corresponding position based on an operation result of the sound signals of the frequencies. Specifically, for each pair of microphones and each frequency of sound signal, the domain controller can obtain the amplitude of the corresponding frequency of the sound signal collected by the external microphone and the amplitude of the corresponding frequency of the sound signal collected by the internal microphone, then, the ratio between the amplitude of the corresponding frequency of the sound signal collected by the internal microphone and the amplitude of the corresponding frequency of the sound signal collected by the external microphone is used as the gain of the internal and external sound amplitude corresponding to the corresponding frequency at the corresponding position, namely, for each sounding frequency, the gain data of the internal and external sound amplitude with the same number as the number of the pairs of microphones can be obtained respectively. Taking the sound emission frequency of the vehicle-exterior speaker as w _x as an example, the magnitude gain H (w _x) in the vehicle interior corresponding to each pair of microphones at the sound emission frequency w _x is = (the magnitude of the sound signal of the frequency w _x collected by the vehicle-interior microphone/the magnitude of the sound signal of the frequency w _x collected by the vehicle-exterior microphone). The gain of the sound amplitude of each pair of microphones in the interior and exterior of the vehicle under various frequencies can be obtained through the above process, and then, for each pair of microphones, the preset frequency response function at the corresponding position of the vehicle can be obtained according to the gain of the sound amplitude of each pair of microphones in the interior and exterior of the vehicle under various frequencies. After obtaining the preset frequency response function at each corresponding position of the vehicle, the domain controller can store the preset frequency response function at each corresponding position of the vehicle so as to reduce the noise of the vehicle based on the preset frequency response function at each corresponding position of the vehicle and improve the noise reduction effect of the vehicle.

In fig. 4 and 5, three rows of vehicles are taken as an example, and the vehicle interior microphone and the vehicle exterior microphone are respectively mounted on the outside and the inside of the front, middle and rear rows of the vehicles, and the preset frequency response functions H (w) of the 6 positions are different due to the differences in the 6 positions, the vehicle shape, the vehicle material and the like.

Through the method, the preset frequency response function of each corresponding position of the vehicle can be accurately obtained, so that the noise reduction effect of the vehicle is improved, and the vehicle can achieve a better silence effect.

The method for reducing noise of the vehicle provided by the embodiment of the application can further comprise the following steps:

And returning to the step of controlling the loudspeaker outside the vehicle to emit sound signals with different frequencies at regular time so as to update the preset frequency response function at the corresponding position of the vehicle.

In the embodiment of the application, considering that the vehicle sealing materials are worn and aged and the whole vehicle environment is changed along with the extension of the service time of the vehicle, correspondingly, the preset frequency response functions at the corresponding positions of the vehicle are also changed, in order to improve the noise reduction effect of the vehicle, the domain controller can regularly return to execute the steps of controlling the external loudspeaker of the vehicle to send out sound signals with different frequencies and subsequent steps so as to regularly obtain the preset frequency response functions at the corresponding positions of the vehicle through the regular operation of the sweep frequency mode, thereby realizing the regular update of the preset frequency response functions at the corresponding positions of the vehicle, and further realizing the noise reduction of the vehicle based on the latest preset frequency response functions at the corresponding positions of the vehicle. Updating the preset frequency response function at each corresponding position of the vehicle by timing operation of the sweep frequency mode can compensate for the silent change caused by the wear of the vehicle so as to improve the silent effect of the vehicle.

Of course, the user may also send a preset frequency response function update instruction to the domain controller, and after receiving the preset frequency response function update instruction, the domain controller may also return to executing the step of controlling the speaker outside the vehicle to send out sound signals with different frequencies, so as to implement updating of the preset frequency response function at each corresponding position of the vehicle based on the update instruction.

The method for reducing noise of the vehicle, provided by the embodiment of the application, controls the loudspeaker outside the vehicle to emit sound signals with different frequencies, and can comprise the following steps:

controlling a loudspeaker outside the vehicle to emit sound signals with different frequencies in a full frequency band according to a preset frequency interval;

Wherein, the interval between the sound signals of two adjacent frequencies is preset time interval.

In the embodiment of the application, the domain controller can specifically control the loudspeaker outside the vehicle to emit sound signals with different frequencies within the full frequency band range according to the preset frequency interval. The preset frequency interval can be 1Hz, 2Hz, 5Hz, 10Hz and the like, and the smaller the interval is, the larger the acquired data volume is, the more accurate the obtained preset frequency response function is, and the better the noise reduction effect of the vehicle is.

In addition, when the external speaker of the vehicle is controlled to emit sound signals with different frequencies according to the preset frequency interval, a preset time interval can be reserved between the sound signals with two adjacent frequencies, specifically, after the sound signal with the previous frequency is emitted, the sound signal with the next frequency is emitted after waiting for the preset time interval, so that the sound signals collected by the external microphone and the internal microphone of the vehicle correspond to the frequencies more accurately, and the accuracy of obtaining the preset frequency response function is improved. The preset time interval may be 100ms, 200ms, 500ms, or the like, and the specific size may be set in advance through experiments or according to experience, or the like.

The external speaker of the vehicle is controlled to emit sound signals of each frequency for a plurality of times.

In the embodiment of the application, when the external loudspeaker is controlled to emit sound signals with different frequencies, the external loudspeaker can be controlled to emit sound signals with each frequency for a plurality of times, and correspondingly, when a preset frequency response function is obtained according to the amplitude of the sound signals, the amplitude of the used sound signals can be the average value of the amplitude of the sound signals acquired for a plurality of times under the corresponding frequency, so that the accuracy of determining the preset frequency response function is improved.

The embodiment of the application provides a vehicle noise reduction method, wherein a preset frequency response function is the corresponding relation between each frequency and the gain of the internal and external sound amplitude of a vehicle; the gain of the sound amplitude inside and outside the vehicle is the ratio of the amplitude of the sound signal collected by the microphone inside the vehicle to the amplitude of the sound signal collected by the corresponding microphone outside the vehicle;

Or the preset frequency response function is a relation function between the frequency of the sound signal and the gain of the sound amplitude inside and outside the vehicle.

In the embodiment of the application, the preset frequency response function at each corresponding position of the vehicle may specifically be a corresponding relation between each frequency and the gain of the internal and external sound amplitude, that is, the preset frequency response function at each corresponding position of the vehicle may include multiple sets of frequency-gain data sets of the internal and external sound amplitude, each data set includes one frequency and the gain of the internal and external sound amplitude corresponding to the frequency, and then, when the vehicle is denoised, the target data set corresponding to the frequency of the external noise signal may be obtained from the multiple sets of frequency-gain data sets of the internal and external sound amplitude according to the frequency of the external noise signal, and then, the internal noise signal may be obtained based on the corresponding internal and external sound amplitude so as to reduce the noise of the vehicle.

Or the preset frequency response function at each corresponding position of the vehicle may be a relation function between frequency and the gain of the sound amplitude inside and outside the vehicle, as shown in fig. 6, which shows a schematic diagram of the preset frequency response function provided by the embodiment of the present application, where the abscissa is frequency and the ordinate is the gain of the sound amplitude inside and outside the vehicle. Specifically, after acquiring multiple sets of frequency-in-vehicle and out-of-vehicle sound amplitude gain data sets at each corresponding position of the vehicle, the domain controller may obtain a relationship function between the frequency and the in-vehicle and out-of-vehicle sound amplitude gain in a polynomial fitting manner, where the polynomial fitting may be specifically implemented by a CPU (Central Processing Unit ) in the domain controller.

The embodiment of the application also provides a vehicle noise reduction device, wherein external microphones are installed at a plurality of positions of a vehicle, and internal speakers are installed in the vehicle, and referring to fig. 7, a schematic structural diagram of the vehicle noise reduction device provided by the embodiment of the application is shown, and the vehicle noise reduction device may include:

The determining module 71 is configured to obtain an external noise signal collected by an external microphone, and obtain an internal noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and the external noise signal collected by the external microphone;

the noise reduction processing module 72 is configured to perform noise reduction processing on the noise signal in the vehicle at the corresponding position.

The vehicle noise reduction device provided by the embodiment of the application can further comprise:

The reference signal acquisition module is used for acquiring a reference signal of sound in the vehicle when acquiring an external noise signal acquired by an external microphone and the frequency of the external noise signal;

And the correction module is used for correcting the in-vehicle noise signal according to the reference signal before the noise reduction processing is carried out on the in-vehicle noise signal at the corresponding position, so as to obtain the corrected in-vehicle noise signal.

The embodiment of the application provides a vehicle noise reduction device, wherein a vehicle interior loudspeaker is arranged in a vehicle;

the noise reduction processing module 72 may include:

And the reverse processing sub-module is used for carrying out reverse processing on the in-vehicle noise signals and playing the in-vehicle noise signals after the reverse processing by utilizing the corresponding in-vehicle speakers.

The vehicle noise reduction device provided by the embodiment of the application, the reverse processing sub-module may include:

and the reverse processing unit is used for acquiring the noise reduction mode and carrying out reverse processing on the noise signals in the vehicle according to the noise reduction mode.

The noise reduction mode of the vehicle noise reduction device provided by the embodiment of the application can comprise a complete silence mode, an ESE sound wave mode and a whistling audible mode, and the reverse processing unit can comprise:

The first reverse processing subunit is used for carrying out reverse processing on sound signals of all frequency bands in the noise signals in the vehicle when the noise reduction mode is a complete silence mode;

The second inverse processing subunit is used for attenuating the sound signals of the first target frequency band in the noise signals in the vehicle when the noise reduction mode is the ESE sound wave mode, and carrying out inverse processing on the sound signals of the attenuated first target frequency band and the sound signals of other frequency bands in the noise signals in the vehicle; the first target frequency band is a frequency band corresponding to sound waves, or a frequency band corresponding to sound waves and a frequency band corresponding to whistling of other vehicles;

The third reversing processing subunit is used for attenuating the sound signals of the second target frequency band in the noise signals in the vehicle when the noise reduction mode is a whistling audible mode, and reversing the attenuated sound signals of the second target frequency band and the sound signals of other frequency bands in the noise signals in the vehicle; the second target frequency band is a frequency band corresponding to the whistle of the other vehicle.

The vehicle noise reduction device provided by the embodiment of the application, the reverse processing unit may include:

And the fourth reversing processing subunit is used for acquiring the noise reduction modes at the positions corresponding to the external microphones on the vehicle and reversing the noise signals in the vehicle at the corresponding positions according to the noise reduction modes at the positions corresponding to the external microphones on the vehicle.

The vehicle noise reduction device provided by the embodiment of the application is characterized in that the interior of the vehicle at the corresponding position of each vehicle exterior microphone is provided with the vehicle interior microphone, the exterior of the vehicle is also provided with the vehicle exterior speaker, and the vehicle noise reduction device can further comprise:

the control module is used for controlling the loudspeaker outside the vehicle to emit sound signals with different frequencies and controlling the microphone outside the vehicle and the microphone inside the vehicle to collect sound signals with corresponding frequencies;

the frequency response function obtaining module is used for obtaining sound signals of corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle, and obtaining a preset frequency response function at the corresponding position of the vehicle according to the sound signals of the corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle.

And the timing return module is used for timing return to execute the step of controlling the loudspeaker outside the vehicle to emit sound signals with different frequencies so as to update the preset frequency response function at the corresponding position of the vehicle.

The embodiment of the application provides a vehicle noise reduction device, and a control module can comprise:

The first control sub-module is used for controlling the loudspeaker outside the vehicle to emit sound signals with different frequencies in a full frequency band according to a preset frequency interval;

and the second control submodule is used for controlling the loudspeaker outside the vehicle to emit sound signals of each frequency for a plurality of times.

The embodiment of the application provides a vehicle noise reduction device, wherein a preset frequency response function is the corresponding relation between each frequency and the gain of the internal and external sound amplitude of a vehicle; the gain of the sound amplitude inside and outside the vehicle is the ratio of the amplitude of the sound signal collected by the microphone inside the vehicle to the amplitude of the sound signal collected by the corresponding microphone outside the vehicle;

The embodiment of the application also provides a domain controller, wherein the outside of the vehicle at a plurality of positions is provided with the outside microphone, the domain controller is connected with the outside microphone and the inside speaker, and the domain controller is used for realizing the steps of any vehicle noise reduction method.

Referring to fig. 8, which shows a system frame diagram of vehicle noise reduction provided by the embodiment of the present application, a domain controller provided by the embodiment of the present application may include a control unit, a noise reduction DSP and an audio DSP connected to the control unit, a switch connected to the control unit and the noise reduction DSP, and a memory connected to the switch, where the noise reduction DSP is connected to the audio DSP, and the audio DSP is connected to an off-vehicle microphone through a first ADC, where:

the memory is used for storing preset frequency response functions at corresponding positions of the microphones outside the vehicle;

The control unit is used for controlling the off-vehicle microphone to collect off-vehicle noise signals, acquiring the frequency of the off-vehicle noise signals collected by the off-vehicle microphone, and controlling the change-over switch to be switched to the noise reduction DSP so that the noise reduction DSP acquires a preset frequency response function at a corresponding position of the vehicle from the memory;

And the noise reduction DSP is used for obtaining the in-vehicle noise signals at the corresponding positions according to the preset frequency response function at the corresponding positions of the vehicle and the out-of-vehicle noise signals acquired by the out-of-vehicle microphones, and carrying out noise reduction treatment on the in-vehicle noise signals at the corresponding positions.

The control unit in the domain controller may specifically be an SOC (SERIAL PERIPHERAL INTERFACE, system on a chip) or an MCU (Microcontroller Unit, micro control unit). The control unit is connected with an audio DSP (DIGITAL SIGNAL Processor), a noise reduction DSP and a change-over switch, wherein the control unit is connected with the noise reduction DSP and the change-over switch through an SPI (SERIAL PERIPHERAL INTERFACE ). The change-over switch is connected with the noise reduction DSP and the memory through SPI (SERIAL PERIPHERAL INTERFACE ), and the memory can be specifically a Flash memory. The audio DSP is connected with the noise reduction DSP, the audio DSP is connected with the first ADC and the external microphone, the sound signals collected by the external microphone are connected with the audio DSP after analog-to-digital conversion, and N paths (N is the number of the external microphones, N is more than or equal to 2) of sound signals collected by the external microphone can be transmitted by using N time slots of TDM. The audio DSP is used for switching and processing audio data of the whole car cabin system, the noise reduction DSP is used for noise reduction operation processing, and preset frequency response functions at corresponding positions of the car can be stored in the memory.

When the vehicle is denoised, the control unit controls the change-over switch to be switched to the denoise DSP, so that the SPI of the change-over switch is communicated with the denoise DSP, and the denoise DSP can acquire a preset frequency response function at a corresponding position of the vehicle from the memory. And the control unit controls the on-off of the vehicle-exterior microphone to collect the vehicle-exterior noise signal and acquire the frequency of the vehicle-exterior noise signal collected by the vehicle-exterior microphone. The method comprises the steps that the vehicle exterior noise signals collected by N vehicle exterior microphones are subjected to analog-to-digital conversion through a first ADC, then are transmitted to an audio DSP through N time slots of a TDM channel, and are transmitted to a noise reduction DSP through the audio DSP, the noise reduction DSP receives the vehicle exterior noise signals transmitted by the N time slots of the TDM, and noise reduction processing is carried out on the vehicle exterior noise signals collected by each vehicle exterior microphone according to a preset frequency response function and the vehicle exterior noise signals at corresponding positions of the vehicle, so that noise reduction is achieved.

In addition, the control unit may control the noise reduction DSP to perform noise reduction processing according to any of the above-mentioned vehicle noise reduction methods, and the specific process is referred to the detailed description of the corresponding portion and will not be repeated here.

According to the domain controller provided by the embodiment of the application, an in-car speaker is arranged in a car, and an audio DSP is connected with the in-car speaker through a first power amplifier;

The noise reduction DSP is specifically used for carrying out reverse processing on the noise signals in the vehicle, sending the noise signals in the vehicle after the reverse processing to the speaker in the vehicle through the audio DSP and the first power amplifier, and playing the noise signals in the vehicle after the reverse processing by the speaker in the vehicle.

In the embodiment of the application, the vehicle interior can be provided with the vehicle interior loudspeaker, in particular the multichannel vehicle interior loudspeaker, and the vehicle interior loudspeaker can be particularly distributed near a vehicle interior target position (the target position corresponds to the installation position of the vehicle exterior microphone) so as to realize active noise reduction based on the vehicle interior loudspeaker. The audio DSP in the domain controller is connected with the speaker in the vehicle through a first power amplifier.

The noise reduction processing of the noise signal in the vehicle at the corresponding position by the noise reduction DSP can be specifically that the noise signal in the vehicle is reversely processed, the noise signal in the vehicle after the reverse processing is sent to the speaker in the vehicle through the audio DSP and the first power amplifier, and the speaker in the vehicle plays the noise signal in the vehicle after the reverse processing. Specifically, after the noise reduction DSP obtains the inversely processed in-vehicle noise signals, the inversely processed in-vehicle noise signals are transmitted to the audio DSP by using N time slots of the TDM uplink channel, and the audio DSP transmits the N groups of inversely processed in-vehicle noise signals to in-vehicle speakers at corresponding positions through the first power amplifiers, and the in-vehicle speakers broadcast the corresponding inversely processed in-vehicle noise signals, so as to realize active noise reduction.

According to the domain controller provided by the embodiment of the application, the in-car microphone is arranged in the corresponding position of each in-car microphone on the vehicle, the out-car loudspeaker is also arranged outside the vehicle, the in-car microphone is connected with the audio DSP through the second ADC, and the out-car loudspeaker is connected with the audio DSP through the second power amplifier, wherein:

the control unit is further used for controlling the audio DSP to sweep frequency and sound the vehicle-exterior loudspeaker so as to enable the vehicle-exterior loudspeaker to emit sound signals with different frequencies, controlling the vehicle-exterior microphone and the vehicle-interior microphone to collect sound signals with corresponding frequencies, acquiring the sound signals with corresponding frequencies collected by the vehicle-exterior microphone and the vehicle-interior microphone through the first ADC, the second ADC and the audio DSP, acquiring a preset frequency response function at the corresponding position of the vehicle according to the sound signals with corresponding frequencies collected by the vehicle-exterior microphone and the vehicle-interior microphone, and connecting the preset frequency response function at the corresponding position of the vehicle with the memory through controlling the change-over switch so as to store the preset frequency response function at the corresponding position of the vehicle in the memory.

The vehicle microphone is installed in the vehicle corresponding to the installation position of the vehicle microphone, the vehicle microphone can be connected with the audio DSP through the second ADC, and multipath audio data collected by the vehicle microphone can be transmitted through a plurality of time slots of TDM. In addition, the outside of the vehicle is also provided with an external loudspeaker which can be connected with the audio DSP through a second power amplifier.

When the preset frequency response function of each corresponding position of the vehicle is obtained, the control unit can control the audio DSP to sweep frequency and sound the loudspeaker outside the vehicle. Meanwhile, the control unit controls the in-vehicle microphone and the out-vehicle microphone to collect radio, the in-vehicle and out-vehicle sound amplitude gain is calculated in real time through the collected amplitude, a plurality of preset frequency response functions (namely preset frequency response functions at corresponding positions of the vehicle) are obtained after the sweep is finished, the control unit is connected with the memory through controlling the change-over switch, and then the obtained plurality of preset frequency response functions can be stored in the memory for use by the noise reduction DSP.

The embodiment of the application also provides a vehicle, wherein the outside of the vehicle at a plurality of positions is provided with the outside microphone, the inside of the vehicle is provided with the inside speaker, and the vehicle is used for realizing the step of the noise reduction method of any vehicle.

According to the vehicle provided by the embodiment of the application, the in-vehicle microphone is arranged in the position corresponding to each out-of-vehicle microphone on the vehicle, and the out-of-vehicle loudspeaker is also arranged outside the vehicle.

The embodiment of the application also provides a readable storage medium, and the readable storage medium stores a computer program which realizes the steps of any vehicle noise reduction method when being executed by a processor.

The description of the relevant parts in the vehicle noise reduction device, the domain controller, the vehicle and the readable storage medium provided in the embodiment of the application can be referred to the detailed description of the corresponding parts in the vehicle noise reduction method provided in the embodiment of the application, and will not be repeated here.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the readable storage medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A vehicle noise reduction method characterized in that external microphones are mounted outside a vehicle at a plurality of positions, the vehicle noise reduction method comprising:

Acquiring an off-vehicle noise signal acquired by the off-vehicle microphone, and acquiring an in-vehicle noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and the off-vehicle noise signal acquired by the off-vehicle microphone;

and carrying out noise reduction processing on the noise signals in the vehicle at the corresponding positions.

2. The vehicle noise reduction method according to claim 1, characterized in that, when acquiring the vehicle exterior noise signal acquired by the vehicle exterior microphone, further comprising:

acquiring a reference signal of the sound inside the vehicle;

before the noise reduction processing is performed on the in-vehicle noise signals at the corresponding positions, the method further comprises:

And correcting the noise signal in the vehicle according to the reference signal to obtain the corrected noise signal in the vehicle.

3. The vehicle noise reduction method according to claim 1, characterized in that the vehicle interior is mounted with an in-vehicle speaker;

noise reduction processing is carried out on the noise signals in the vehicle at the corresponding positions, and the noise reduction processing comprises the following steps:

And reversely processing the noise signal in the vehicle, and playing the reversely processed noise signal in the vehicle by utilizing the corresponding speaker in the vehicle.

4. A vehicle noise reduction method according to claim 3, wherein the inverse processing of the in-vehicle noise signal comprises:

And acquiring a noise reduction mode, and carrying out reverse processing on the noise signal in the vehicle according to the noise reduction mode.

5. The method of vehicle noise reduction according to claim 4, wherein the noise reduction modes include a completely silent mode, an ESE sound wave mode, and a whistling audible mode, and reversing the in-vehicle noise signal according to the noise reduction modes comprises:

When the noise reduction mode is an ESE sound wave mode, attenuating the sound signal of a first target frequency band in the in-vehicle noise signal, and carrying out reverse processing on the attenuated sound signal of the first target frequency band and the sound signals of other frequency bands in the in-vehicle noise signal; the first target frequency band is a frequency band corresponding to sound waves, or a frequency band corresponding to sound waves and a frequency band corresponding to whistling of other vehicles;

When the noise reduction mode is a whistling audible mode, attenuating the sound signal of a second target frequency band in the in-vehicle noise signal, and carrying out reverse processing on the attenuated sound signal of the second target frequency band and the sound signals of other frequency bands in the in-vehicle noise signal; the second target frequency band is a frequency band corresponding to the whistle of other vehicles.

6. The vehicle noise reduction method according to claim 5, wherein acquiring a noise reduction pattern, and performing inverse processing on the in-vehicle noise signal according to the noise reduction pattern, comprises:

and acquiring noise reduction modes of the positions corresponding to the microphones outside the vehicle, and carrying out reverse processing on the noise signals in the vehicle at the corresponding positions according to the noise reduction modes of the positions corresponding to the microphones outside the vehicle.

7. The vehicle noise reduction method according to any one of claims 1 to 6, characterized in that an in-vehicle microphone is mounted inside the vehicle at a position corresponding to each of the in-vehicle microphones, an out-vehicle speaker is also mounted outside the vehicle, the method further comprising:

controlling the external loudspeaker to emit sound signals with different frequencies, and controlling the external microphone and the internal microphone to collect sound signals with corresponding frequencies;

And acquiring sound signals of corresponding frequencies acquired by the vehicle-exterior microphone and the vehicle-interior microphone, and acquiring a preset frequency response function at the corresponding position of the vehicle according to the sound signals of corresponding frequencies acquired by the vehicle-exterior microphone and the vehicle-interior microphone.

8. The vehicle noise reduction method according to claim 7, characterized by further comprising:

And returning to the step of controlling the off-board loudspeaker to emit sound signals with different frequencies at regular time so as to update the preset frequency response function at the corresponding position of the vehicle.

9. The method of vehicle noise reduction according to claim 7, wherein controlling the off-board speakers to emit sound signals of different frequencies comprises:

controlling the external loudspeaker to emit sound signals with different frequencies in a full frequency band according to a preset frequency interval;

10. The method of vehicle noise reduction according to claim 7, wherein controlling the off-board speakers to emit sound signals of different frequencies further comprises:

And controlling the loudspeaker outside the vehicle to emit sound signals of each frequency for a plurality of times.

11. The method of vehicle noise reduction according to claim 7, wherein the preset frequency response function is a correspondence between each of the frequencies and an in-vehicle and-out sound amplitude gain; the in-car and out-of-car sound amplitude gain is the ratio of the amplitude of the sound signal collected by the in-car microphone to the amplitude of the sound signal collected by the corresponding out-of-car microphone;

12. A domain controller, characterized in that an off-vehicle microphone is externally mounted at a plurality of locations of a vehicle, the domain controller being connected to the off-vehicle microphone, the domain controller being adapted to implement the steps of the vehicle noise reduction method according to any one of claims 1 to 11.

13. The domain controller of claim 12, comprising a control unit, a noise reduction DSP and an audio DSP coupled to the control unit, a switch coupled to the control unit and the noise reduction DSP, a memory coupled to the switch, the noise reduction DSP coupled to the audio DSP, the audio DSP coupled to the off-board microphone via a first ADC, wherein:

The memory is used for storing preset frequency response functions at the corresponding positions of the microphones outside the vehicle;

The control unit is used for controlling the off-vehicle microphone to collect off-vehicle noise signals, acquiring the off-vehicle noise signals collected by the off-vehicle microphone, and controlling the change-over switch to be switched to the noise reduction DSP so that the noise reduction DSP acquires a preset frequency response function at the corresponding position of the vehicle from the memory;

The noise reduction DSP is used for obtaining an in-vehicle noise signal at a corresponding position according to a preset frequency response function at the corresponding position of the vehicle and an out-of-vehicle noise signal acquired by the out-of-vehicle microphone, and performing noise reduction processing on the in-vehicle noise signal at the corresponding position.

14. The domain controller of claim 13, wherein the vehicle interior is equipped with an in-vehicle speaker, and the audio DSP is connected to the in-vehicle speaker through a first power amplifier;

The noise reduction DSP is specifically configured to perform reverse processing on the noise signal in the vehicle, send the noise signal in the vehicle after reverse processing to the speaker in the vehicle through the audio DSP and the first power amplifier, and play the noise signal in the vehicle after reverse processing by the speaker in the vehicle.

15. The domain controller of claim 13, wherein an in-vehicle microphone is mounted inside each of the off-vehicle microphones on the vehicle, an off-vehicle speaker is mounted outside the vehicle, the in-vehicle microphone is connected to the audio DSP through a second ADC, and the off-vehicle speaker is connected to the audio DSP through a second power amplifier, wherein:

The control unit is further configured to control the audio DSP to perform sweep frequency sounding on the speaker outside the vehicle, so that the speaker outside the vehicle emits sound signals with different frequencies, control the microphone outside the vehicle and the microphone inside the vehicle to collect sound signals with corresponding frequencies, obtain the sound signals with corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle through the first ADC, the second ADC and the audio DSP, obtain a preset frequency response function at a corresponding position of the vehicle according to the sound signals with corresponding frequencies collected by the microphone outside the vehicle and the microphone inside the vehicle, and connect the memory through controlling the switch, so that the preset frequency response function at the corresponding position of the vehicle is stored in the memory.

16. A vehicle having externally mounted vehicle-exterior microphones at a plurality of locations, the vehicle being for implementing the steps of the vehicle noise reduction method according to any one of claims 1 to 11.

17. The vehicle of claim 16, wherein an in-vehicle microphone is mounted inside the vehicle at a location corresponding to each of the off-vehicle microphones, and an off-vehicle speaker is mounted outside the vehicle.

18. A readable storage medium, characterized in that the readable storage medium has stored therein a computer program which, when executed by a processor, implements the steps of the vehicle noise reduction method according to any one of claims 1 to 11.