CN113295267A - Method and system for evaluating sound of intake air flow based on sound scene and readable storage medium - Google Patents
Method and system for evaluating sound of intake air flow based on sound scene and readable storage medium Download PDFInfo
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Abstract
The invention provides an intake airflow sound evaluation method, system and readable storage medium based on an acoustic scene, wherein the method comprises the following steps: when the vehicle is started, measuring the size of the airflow sound of the intake air in the vehicle through a microphone to extract a frequency spectrum curve of the airflow sound of the intake air and set a first rotating speed corresponding to the engine when the airflow sound of the intake air occurs and a second rotating speed corresponding to the engine when the airflow sound of the intake air does not occur in the frequency spectrum curve; performing linear fitting on the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve to obtain a fitting line; and arranging the frequency spectrum curve and the fit line in the same coordinate system, and defining the maximum value of the distance from the frequency spectrum curve to the fit line as an objective measurement index of the airflow sound of the air inlet. The method and the device have the advantages that the objective processing process of the air inflow sound is standardized, the randomness of subjective feeling is effectively avoided, the correction and the optimization of the air inflow sound are facilitated, and the use experience of a user is improved.
Description
Technical Field
The invention relates to the technical field of automobile vibration and noise control, in particular to an intake airflow sound evaluation method and system based on a sound scene and a readable storage medium.
Background
With the rapid development of science and technology and productivity, automobiles have become popular in people's daily life and become one of the indispensable transportation means for people.
In order to improve the power performance of automobiles, existing automobile manufacturers develop turbochargers which have better power performance and meet the requirements on the economy of automobiles, and are widely applied to the existing automobile engines. However, since the turbocharger generates operating rotational speeds of a dozen or even hundreds of thousands of revolutions per minute during operation, certain operating noises are inevitably generated. This noise radiates noise to the air through the intake pipe and pipe walls, which is typical of intake airflow noise. At low flow rates, if the pressure ratio increases so that the turbocharger operating curve is too close to the surge line, the separation of the air flow from the wall creates disturbances that cause pressure fluctuations at the compressor air inlet, thereby creating intake air flow noise.
However, most of the existing automobile manufacturers judge the intake airflow noise in a mode of subjective evaluation by workers, and due to the fact that the working experience of the workers is different, the sound field is different, and other objective factors exist, the mode of subjective evaluation has a certain error, which is not beneficial to rectifying, modifying and optimizing the intake airflow noise, and reduces the use experience of users.
Disclosure of Invention
Based on this, the invention aims to provide an intake airflow sound evaluation method and system based on an acoustic scene and a readable storage medium, so as to solve the problems that most of the prior art judges the intake airflow noise in a mode of subjective evaluation by workers, has a certain error and is not beneficial to rectifying, modifying and optimizing the intake airflow noise.
An intake airflow sound evaluation method based on an acoustic scene, the method comprising:
when a vehicle is started, measuring the size of air flow sound in the vehicle through a microphone to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to an engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
linearly fitting the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve and obtaining a fitting line;
and arranging the frequency spectrum curve and the fitting line in the same coordinate system, and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound of the inlet air.
The invention has the beneficial effects that: the method comprises the steps of measuring the size of the airflow sound of the air inlet in the vehicle through a microphone, extracting a frequency spectrum curve corresponding to the airflow sound of the air inlet, setting a first rotating speed corresponding to an engine when the airflow sound of the air inlet occurs and a second rotating speed corresponding to the engine when the airflow sound of the air inlet does not occur in the frequency spectrum curve, carrying out quantitative processing on the airflow sound of the air inlet preliminarily, carrying out linear fitting on a rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve to obtain a fitting line, carrying out quantitative processing on the rotating speed of the engine preliminarily, finally arranging the frequency spectrum curve and the fitting line in the same coordinate system, and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound of the air inlet, so that the airflow sound can be finally subjected to quantitative processing. The method not only standardizes the objective processing process of the air inflow sound, but also effectively avoids the randomness of subjective feeling, can accurately measure the severity of the air inflow sound, is beneficial to the correction and optimization of the air inflow sound, and improves the use experience of users.
Preferably, the step of measuring the magnitude of the airflow sound in the vehicle through a microphone when the vehicle is started to extract a frequency spectrum curve of the airflow sound and setting a first rotation speed of the engine corresponding to the occurrence of the airflow sound and a second rotation speed of the engine corresponding to the non-occurrence of the airflow sound in the frequency spectrum curve includes:
the method comprises the steps that gears of the vehicle are switched for multiple times, and the magnitude of air inflow sound corresponding to each gear in the vehicle is measured through a microphone, so that a frequency spectrum curve of the air inflow sound corresponding to each gear is extracted;
and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
Preferably, after the step of setting the first rotation speed of the engine at which the airflow sound occurs and the second rotation speed of the engine at which the airflow sound does not occur in the frequency spectrum corresponding to each gear, the method includes:
obtaining a corresponding fit line through a first rotating speed and a second rotating speed in a frequency spectrum curve corresponding to each gear;
and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
Preferably, after the step of locating the spectrum curve and the fitted line in the same coordinate system and defining the maximum distance between the spectrum curve and the fitted line as the objective measure of the airflow sound, the method includes:
measuring the sizes of air inflow sound in a plurality of vehicles through the microphones and obtaining an objective measurement index of the air inflow sound corresponding to each vehicle;
and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
Preferably, after the step of scoring the airflow sound corresponding to each vehicle and obtaining a corresponding score value, the method includes:
subtracting a reserved deviation value from the objective measurement index correspondingly acquired by each vehicle to obtain an intake airflow sound target value, wherein the reserved deviation value is a standard deviation of the objective measurement index acquired by each vehicle under the same working condition;
and establishing a linear function according to the scoring value and the intake airflow target value.
Another object of the present invention is to provide an intake airflow acoustic evaluation system based on acoustic scenes, the system comprising:
the measuring module is used for measuring the size of air flow sound in a vehicle through a microphone when the vehicle is started so as to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to an engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
the first calculation module is used for performing linear fitting on the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve to obtain a fitting line;
and the second calculation module is used for arranging the frequency spectrum curve and the fitting line in the same coordinate system and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound of the air inlet.
In the above intake airflow sound evaluation system based on an acoustic scene, the measurement module is specifically configured to:
the method comprises the steps that gears of the vehicle are switched for multiple times, and the magnitude of air inflow sound corresponding to each gear in the vehicle is measured through a microphone, so that a frequency spectrum curve of the air inflow sound corresponding to each gear is extracted;
and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
In the above intake airflow sound evaluation system based on an acoustic scene, the measurement module is specifically configured to:
obtaining a corresponding fit line through a first rotating speed and a second rotating speed in a frequency spectrum curve corresponding to each gear;
and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
In the above system for evaluating airflow sound based on an intake air flow in an acoustic scene, the second calculating module is specifically configured to:
measuring the sizes of air inflow sound in a plurality of vehicles through the microphones and obtaining an objective measurement index of the air inflow sound corresponding to each vehicle;
and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
Another object of the invention is to propose a readable storage medium, in which a program is stored which, when executed by a processor, implements the method described above.
Additional aspects and advantages of the invention 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 invention.
Drawings
FIG. 1 is a flow chart of an intake airflow acoustic evaluation method based on acoustic scenes according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating objective measures of intake airflow sound in an intake airflow sound evaluation method based on an acoustic scene according to a first embodiment of the present invention;
FIG. 3 is a flow chart of an intake airflow acoustic evaluation method based on an acoustic scene according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a linear function of a score value and an intake airflow target value in an intake airflow acoustic evaluation method based on an acoustic scene according to a second embodiment of the present invention;
fig. 5 is a block diagram illustrating an intake airflow sound evaluation system in an acoustic-based scene according to a third embodiment of the present invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Most of existing automobile manufacturers judge the intake airflow noise in a mode of subjective evaluation by workers, and due to the fact that the working experience of the workers is different, the sound field is different and other objective factors exist, the mode of subjective evaluation has certain errors, the correction and the optimization of the intake airflow noise are not facilitated, and the use experience of users is reduced, so that the method capable of quantifying the intake airflow noise is necessary for overcoming the defects of the prior art.
Referring to fig. 1, a method for evaluating an intake airflow sound based on a sound scene according to a first embodiment of the present invention is specifically applied to an automobile, and it can be understood by those skilled in the art that the automobile is pre-equipped with hardware such as an engine and a microphone, and a certain intake airflow is generated during operation of the engine, and the intake airflow generates a certain intake airflow sound, which affects driving experience of a driver.
In order to solve the above problem, a first embodiment of the present application provides an intake airflow sound evaluation method based on an acoustic scene, which specifically includes the following steps:
step S10, when the vehicle is started, measuring the size of the air flow sound in the vehicle through a microphone to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
specifically, in this embodiment, it can be understood that when the vehicle is started, the engine in the vehicle may generate a certain rotation speed, and when the rotation speed is low, the engine may not necessarily generate the intake airflow sound, and when the turbocharger in the engine reaches a working rotation speed of hundreds of thousands of settings per minute, the engine inevitably may generate a strong intake airflow sound, and the intake airflow sound at this time may become a noise that affects the driving experience of the driver, thereby reducing the driving experience of the driver.
In this embodiment, when the airflow sound is generated, the magnitude of the airflow sound in the vehicle is measured by the vehicle microphone, a corresponding spectrogram is generated and a spectrum curve thereof is extracted, and meanwhile, a first rotation speed of the engine corresponding to the occurrence of the airflow sound and a second rotation speed of the engine corresponding to the non-occurrence of the airflow sound are set in the obtained spectrum curve, that is, when the strong airflow sound is generated in the vehicle, the corresponding first rotation speed of the engine is recorded, and when the strong airflow sound in the vehicle is eliminated, the corresponding second rotation speed of the engine is recorded, and then the first rotation speed and the second rotation speed are set in the spectrum curve.
Step S20, performing linear fitting on the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve to obtain a fitting line;
in this embodiment, after the frequency spectrum curve is obtained, the frequency spectrum curve is input into an auxiliary tool such as excel, and the frequency of the intake airflow sound in the rotation speed interval of the first rotation speed and the second rotation speed in the frequency spectrum curve is linearly fitted by the auxiliary tool such as excel, and a corresponding fitting line is obtained, and the fitting line may also be referred to as a masking line, and is a straight line having a slope.
And step S30, arranging the frequency spectrum curve and the fitting line in the same coordinate system, and defining the maximum distance between the frequency spectrum curve and the fitting line as an objective measurement index of the airflow sound.
Specifically, in this embodiment, after the spectrum curve and the fit line are both obtained, the spectrum curve and the fit line are simultaneously set in the same coordinate system through an excel or other tool, at this time, the corresponding relationship between the spectrum curve and the fit line can be clearly known, meanwhile, the distance relationship between the spectrum curve and the fit line can be clearly known, and finally, the maximum value of the distance from the spectrum curve to the fit line can be defined as the objective measurement index of the airflow sound of the intake air. As shown in fig. 2, where the maximum distance of the spectral curve to the fit line is an objective measure of the sound of the intake airflow.
When the device is used, the size of the airflow sound of the air in the vehicle is measured through the microphone, a frequency spectrum curve corresponding to the airflow sound of the air is extracted, a first rotating speed corresponding to the engine when the airflow sound of the air occurs and a second rotating speed corresponding to the engine when the airflow sound of the air does not occur are set in the frequency spectrum curve, the airflow sound of the air can be primarily quantized, meanwhile, a rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve is linearly fitted to obtain a fitting line, the rotating speed of the engine can be primarily quantized, finally the frequency spectrum curve and the fitting line are arranged in the same coordinate system, and the maximum distance between the frequency spectrum curve and the fitting line is defined as an objective measurement index of the airflow sound of the air, so that the airflow sound of the air can be finally quantized. The method not only standardizes the objective processing process of the air inflow sound, but also effectively avoids the randomness of subjective feeling, can accurately measure the severity of the air inflow sound, is beneficial to the correction and optimization of the air inflow sound, and improves the use experience of users.
It should be noted that the above implementation process is only for illustrating the applicability of the present application, but this does not represent that the intake airflow sound evaluation method based on the acoustic scene of the present application is only one implementation flow described above, and on the contrary, the intake airflow sound evaluation method based on the acoustic scene of the present application can be incorporated into the feasible embodiments of the present application as long as it can be implemented.
In summary, the intake airflow sound evaluation method based on the acoustic scene in the embodiments of the present invention not only standardizes the objective processing process of the intake airflow sound, but also effectively avoids the randomness of subjective feeling, can accurately measure the severity of the intake airflow sound, is beneficial to the modification and optimization of the intake airflow sound, and improves the user experience.
Referring to fig. 3, a method for evaluating sound of intake airflow under a sound-based scene according to a second embodiment of the present invention includes the following steps:
step S11, when the vehicle is started, measuring the size of the air flow sound in the vehicle through a microphone to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
in this embodiment, when the airflow sound is generated, the magnitude of the airflow sound in the vehicle is measured by the vehicle microphone, a corresponding spectrogram is generated and a spectrum curve thereof is extracted, and meanwhile, a first rotation speed of the engine corresponding to the occurrence of the airflow sound and a second rotation speed of the engine corresponding to the non-occurrence of the airflow sound are set in the obtained spectrum curve, that is, when the strong airflow sound is generated in the vehicle, the corresponding first rotation speed of the engine is recorded, and when the strong airflow sound in the vehicle is eliminated, the corresponding second rotation speed of the engine is recorded, and then the first rotation speed and the second rotation speed are set in the spectrum curve.
Step S21, switching the gears of the vehicle for multiple times, and measuring the magnitude of the airflow sound of the intake air corresponding to each gear in the vehicle through the microphone to extract the frequency spectrum curve of the airflow sound of the intake air corresponding to each gear; and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
Specifically, in the embodiment, in order to measure the intake airflow sound correspondingly generated during the operation of the engine in the current vehicle in each gear, the gears of the current vehicle are switched for multiple times during the test, wherein when the vehicle is in a manual gear, the gears are sequentially switched from the gear 1 to the gear N of the vehicle; when the vehicle is automatic, the gear D of the vehicle is sequentially switched to the gear N, meanwhile, in the gear switching process, the magnitude of the air intake flow sound corresponding to each gear is sequentially measured through a microphone, the frequency spectrum curve of the air intake flow sound corresponding to each gear is correspondingly extracted, and a first rotating speed corresponding to the engine when the air intake flow sound occurs and a second rotating speed corresponding to the engine when the air intake flow sound does not occur are set in the frequency spectrum curve corresponding to each gear.
This step is similar to step S10, in which a first rotational speed of the engine corresponding to the generation of the strong intake airflow sound in the vehicle is recorded, and a second rotational speed of the engine corresponding to the cancellation of the strong intake airflow sound in the vehicle is recorded, and the first rotational speed and the second rotational speed are set in the frequency spectrum curve.
After the step of setting the first rotation speed of the engine at which the airflow sound occurs and the second rotation speed of the engine at which the airflow sound does not occur in the frequency spectrum corresponding to each gear, the method includes:
step S31, obtaining a corresponding fit line through the first rotating speed and the second rotating speed in the frequency spectrum curve corresponding to each gear; and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
The step is similar to step S20, and in this step, specifically, when the frequency spectrum curve corresponding to each gear and the corresponding first rotation speed and second rotation speed in each frequency spectrum curve are obtained, the frequency of the intake airflow sound in the rotation speed interval of the first rotation speed and the second rotation speed in the frequency spectrum curve corresponding to each gear is linearly fitted by an auxiliary tool such as excel, so as to obtain a fitted line corresponding to each gear, and at the same time, the fitted line corresponding to each gear is collected, and one of the fitted lines is extracted and is made into a graph by the auxiliary tool such as excel, specifically, the extracted fitted line is the fitted line with the largest change curvature in all fitted lines, and the fitted line can reflect the maximum value of the intake airflow sound in the current vehicle to the greatest extent.
Step S41, arranging the frequency spectrum curve and the fitting line in the same coordinate system, and defining the maximum distance between the frequency spectrum curve and the fitting line as an objective measurement index of the airflow sound;
in this embodiment, specifically, the frequency spectrum curve obtained in step S11 and the fit line obtained in step S31 are set in the same coordinate system, at this time, the corresponding relationship between the frequency spectrum curve and the fit line can be clearly known, at the same time, the distance relationship between the frequency spectrum curve and the fit line can be clearly known, and finally, the maximum value of the distance from the frequency spectrum curve to the fit line can be defined as the objective measure of the airflow sound. As shown in fig. 2, where the maximum distance of the spectral curve to the fit line is an objective measure of the sound of the intake airflow.
After the step of locating the spectral curve and the fitted line in the same coordinate system and defining the maximum distance from the spectral curve to the fitted line as an objective measure of the intake airflow sound, the method includes:
step S51, measuring the sizes of the air flow sounds in a plurality of vehicles through the microphones and obtaining the objective measurement indexes of the air flow sounds corresponding to each vehicle; and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
Specifically, in this embodiment, in order to obtain objective measurement indexes corresponding to the airflow sounds in the vehicles to know the magnitude of the airflow sounds in the vehicles, the magnitude of the airflow sounds in each vehicle is measured by a microphone in each vehicle, so as to obtain the objective measurement indexes of the airflow sounds corresponding to each vehicle, and the airflow sounds corresponding to each vehicle are scored to obtain corresponding score values, so as to further quantify the magnitude of the airflow sounds, thereby avoiding the randomness of subjective feeling.
After the step of scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value, the method includes:
step S61, subtracting a reserved deviation value from the objective measurement index correspondingly acquired by each vehicle to obtain an intake airflow sound target value, wherein the reserved deviation value is a standard deviation of the objective measurement index acquired by each vehicle under the same working condition; and establishing a linear function according to the scoring value and the intake airflow target value.
Specifically, in this embodiment, when the objective measurement indicator and the score value corresponding to each vehicle are obtained, a reserved deviation value is subtracted from the objective measurement indicator obtained corresponding to each vehicle to obtain an intake airflow sound target value, where the reserved deviation value is a standard deviation of the objective measurement indicator obtained by each vehicle under the same working condition, and then a linear function is established according to the score value and the intake airflow target value.
The relation between the intake airflow target value and the score value can be established through the linear function, so that the size of the intake airflow sound of each vehicle and the score corresponding to the intake airflow sound can be clearly obtained, the correction and optimization of the intake airflow sound are facilitated, and the use experience of a user is improved.
As shown in fig. 4, wherein the score of 6.5 corresponds to the intake airflow target value of 3.95db (a), and the score is 10 points, the lower the score, the louder the intake airflow is, and the score of 6 is acceptable to the user. In order to accurately find the correlation between the score value and the objective data, the score of the intake airflow sound needs to be further refined near the acceptable score, specifically, the actual score can be correspondingly refined by adopting a small grade of 0.25, so that the size of the intake airflow sound can be further quantified, and the correction and optimization are facilitated.
It should be noted that, the method provided by the second embodiment of the present invention, which implements the same principle and produces some technical effects as the first embodiment, can refer to the corresponding contents in the first embodiment for the sake of brief description, where this embodiment is not mentioned.
In summary, the intake airflow sound evaluation method based on the acoustic scene in the embodiments of the present invention not only standardizes the objective processing process of the intake airflow sound, but also effectively avoids the randomness of subjective feeling, can accurately measure the severity of the intake airflow sound, is beneficial to the adjustment and optimization of the intake airflow sound, and improves the user experience.
Referring to fig. 5, a system for evaluating an intake airflow sound under a sound-based scene according to a third embodiment of the present invention is shown, the system specifically includes:
the measuring module 12 is used for measuring the size of the air flow sound in the vehicle through a microphone when the vehicle is started so as to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
the first calculating module 22 is configured to perform linear fitting on a rotation speed interval between the first rotation speed and the second rotation speed in the frequency spectrum curve and obtain a fit line;
and the second calculation module 32 is used for arranging the frequency spectrum curve and the fitting line in the same coordinate system and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound.
Wherein the measurement module is specifically configured to:
the method comprises the steps that gears of the vehicle are switched for multiple times, and the magnitude of air inflow sound corresponding to each gear in the vehicle is measured through a microphone, so that a frequency spectrum curve of the air inflow sound corresponding to each gear is extracted;
and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
Wherein the measurement module is specifically configured to:
obtaining a corresponding fit line through a first rotating speed and a second rotating speed in a frequency spectrum curve corresponding to each gear;
and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
Wherein the second calculation module is specifically configured to:
measuring the sizes of air inflow sound in a plurality of vehicles through the microphones and obtaining an objective measurement index of the air inflow sound corresponding to each vehicle;
and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
Wherein the second computing module is further specifically configured to:
subtracting a reserved deviation value from the objective measurement index correspondingly acquired by each vehicle to obtain an intake airflow sound target value, wherein the reserved deviation value is a standard deviation of the objective measurement index acquired by each vehicle under the same working condition;
and establishing a linear function according to the scoring value and the intake airflow target value.
A readable storage medium having stored therein a program which, when executed by a processor, implements the method of any of the above embodiments.
In summary, the intake airflow sound evaluation method and system based on the acoustic scene in the embodiments of the present invention not only standardizes the objective processing process of the intake airflow sound, but also effectively avoids the randomness of subjective feeling, can accurately measure the severity of the intake airflow sound, is beneficial to the modification and optimization of the intake airflow sound, and improves the user experience.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable 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 "computer-readable 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 computer-readable 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). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An intake airflow sound evaluation method based on an acoustic scene is characterized by comprising the following steps:
when a vehicle is started, measuring the size of air flow sound in the vehicle through a microphone to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to an engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
linearly fitting the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve and obtaining a fitting line;
and arranging the frequency spectrum curve and the fitting line in the same coordinate system, and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound of the inlet air.
2. The acoustic scene-based intake airflow acoustic evaluation method according to claim 1, wherein: the step of measuring the magnitude of the in-vehicle intake airflow sound through a microphone when the vehicle is started to extract a frequency spectrum curve of the intake airflow sound and setting a first rotation speed of the engine corresponding to when the intake airflow sound occurs and a second rotation speed of the engine corresponding to when the intake airflow sound does not occur in the frequency spectrum curve includes:
the method comprises the steps that gears of the vehicle are switched for multiple times, and the magnitude of air inflow sound corresponding to each gear in the vehicle is measured through a microphone, so that a frequency spectrum curve of the air inflow sound corresponding to each gear is extracted;
and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
3. The acoustic scene-based intake airflow acoustic evaluation method according to claim 2, wherein: after the step of setting the first rotation speed of the engine at which the airflow sound occurs and the second rotation speed of the engine at which the airflow sound does not occur in the frequency spectrum corresponding to each gear, the method includes:
obtaining a corresponding fit line through a first rotating speed and a second rotating speed in a frequency spectrum curve corresponding to each gear;
and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
4. The acoustic scene-based intake airflow acoustic evaluation method according to claim 1, wherein: after the step of locating the spectral curve and the fitted line in the same coordinate system and defining the maximum distance from the spectral curve to the fitted line as an objective measure of the intake airflow sound, the method includes:
measuring the sizes of air inflow sound in a plurality of vehicles through the microphones and obtaining an objective measurement index of the air inflow sound corresponding to each vehicle;
and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
5. The acoustic scene-based intake airflow acoustic evaluation method according to claim 4, wherein: after the step of scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value, the method includes:
subtracting a reserved deviation value from the objective measurement index correspondingly acquired by each vehicle to obtain an intake airflow sound target value, wherein the reserved deviation value is a standard deviation of the objective measurement index acquired by each vehicle under the same working condition;
and establishing a linear function according to the scoring value and the intake airflow target value.
6. An intake airflow acoustic evaluation system based on acoustic scenes, the system comprising:
the measuring module is used for measuring the size of air flow sound in a vehicle through a microphone when the vehicle is started so as to extract a frequency spectrum curve of the air flow sound and set a first rotating speed corresponding to an engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in the frequency spectrum curve;
the first calculation module is used for performing linear fitting on the rotating speed interval of the first rotating speed and the second rotating speed in the frequency spectrum curve to obtain a fitting line;
and the second calculation module is used for arranging the frequency spectrum curve and the fitting line in the same coordinate system and defining the maximum value of the distance from the frequency spectrum curve to the fitting line as an objective measurement index of the airflow sound of the air inlet.
7. The acoustic scene-based intake airflow acoustic evaluation system of claim 6, wherein: the measurement module is specifically configured to:
the method comprises the steps that gears of the vehicle are switched for multiple times, and the magnitude of air inflow sound corresponding to each gear in the vehicle is measured through a microphone, so that a frequency spectrum curve of the air inflow sound corresponding to each gear is extracted;
and setting a first rotating speed corresponding to the engine when the air flow sound occurs and a second rotating speed corresponding to the engine when the air flow sound does not occur in a frequency spectrum curve corresponding to each gear.
8. The acoustic scene-based intake airflow acoustic evaluation system of claim 7, wherein: the measurement module is specifically configured to:
obtaining a corresponding fit line through a first rotating speed and a second rotating speed in a frequency spectrum curve corresponding to each gear;
and collecting the fit lines corresponding to each gear and extracting one of the fit lines to make a chart.
9. The acoustic scene-based intake airflow acoustic evaluation system of claim 6, wherein: the second calculation module is specifically configured to:
measuring the sizes of air inflow sound in a plurality of vehicles through the microphones and obtaining an objective measurement index of the air inflow sound corresponding to each vehicle;
and scoring the intake airflow sound corresponding to each vehicle and obtaining a corresponding score value.
10. A readable storage medium in which a program is stored, characterized in that the program, when executed by a processor, implements the method according to any one of claims 1-5.
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