A method for adjusting the volume of a car based on noise curve and volume feedback

Abstract

The application discloses a kind of based on noise curve and volume feedback's automobile volume adjusting method, comprising the following steps: noise equation data acquisition, the size of environmental noise brought by each noise factor in different states of test car is tested, and the equation capable of reflecting noise size is obtained from test result;The value of real-time detection noise factor is brought into the equation obtained in step one, and the sound volume is adjusted after obtaining noise data at this time;Again adjustment, the sound data is obtained by real-time sound receiving in vehicle, and the sound spectrum is obtained after Fourier transform is carried out to sound data, inverse Fourier transform is carried out after the sound of sound playing part is eliminated in frequency domain, and the volume of residual noise in time domain is obtained, compared with the time domain volume of direct sound receiving before processing, and the volume of vehicle sound is adjusted appropriately, so that the hearing volume of sound in vehicle compartment is more uniform, the frequency of driver adjusting volume is reduced, and the attention of driver is avoided to be dispersed.

Description

Technical Field

[0001] This invention relates to the field of automotive volume control technology, specifically a method for adjusting automotive volume based on noise curves and volume feedback. Background Technology

[0002] With the widespread use of in-car infotainment systems, listening to the radio or music while driving has become commonplace. However, due to varying external noise levels during driving, the perceived volume fluctuates, requiring frequent adjustments and impacting driving safety. While in-car infotainment systems have become the central processing unit for automobiles, enabling real-time volume adjustments, the environmental noise levels vary significantly depending on whether the windows are open and the vehicle's speed, interfering with sound perception. For example, a volume of level 3 might be sufficient to hear a car parked at night, but a volume of level 10 might be needed while driving at high speed with the windows open. Current in-car audio volume controls adjust the volume of the audio system itself, failing to effectively and promptly mitigate the impact of external environmental noise. Summary of the Invention

[0003] The purpose of this invention is to provide a method for adjusting car volume based on noise curves and volume feedback, in order to solve the problems mentioned in the background art, such as the existing in-vehicle audio volume control adjusting the volume by adjusting the volume of the audio system, which cannot effectively and timely adjust the audio volume to shield the influence of external environmental noise.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for adjusting car volume based on noise curves and volume feedback, comprising the following steps:

[0005] Step 1: Noise equation data acquisition. Test the ambient noise level caused by each noise factor under different vehicle conditions, plot the test results as curves, and fit an equation that can reflect the noise level.

[0006] Step 2, First-stage adjustment: The noise factor values ​​are detected in real time by various sensors in the car and input into the equation obtained in Step 1 to calculate the ambient noise level. After obtaining the noise data, the audio volume is adjusted for the first time.

[0007] Step 3, second-stage adjustment: Real-time sound recording is performed inside the vehicle to obtain sound data. After performing a Fourier transform on the sound data, the sound spectrum is obtained. After eliminating the sound from the audio playback part in the frequency domain, an inverse Fourier transform is performed to obtain the volume of the remaining noise in the time domain. This volume is compared with the time domain volume of the direct sound recording before processing to determine the percentage of noise volume and audio volume at this time. If the percentage is lower than the preset threshold, the volume of the car audio system is adjusted accordingly.

[0008] In step one, the noise factors involved in the measurement are those that can be collected by the car's built-in sensors. Based on the different values ​​of the noise factors, the equations in step one are used to fit an equation that can describe the relationship between the noise volume and various values. Then, the equation data reflecting the noise level is stored in the central control unit of the car.

[0009] The audio volume control, Fourier transform and inverse Fourier transform of the sound signal are controlled by the central control unit. The collection of various vehicle operating data is the responsibility of various sensors in the vehicle and is summarized to the central control unit through the vehicle bus system.

[0010] In step two, the audio data is collected by the in-car microphone, which communicates with the central control unit.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] This invention reduces the differences in sound perception caused by external interference noise by using devices such as the central control unit and in-vehicle microphone, as well as algorithms based on Fourier transform. It can effectively adjust the audio volume in a timely manner to shield the influence of external environmental noise, making the perceived volume of music in the car more uniform, reducing the frequency of volume adjustments by the driver, and avoiding distraction of the driver's attention. Detailed Implementation

[0013] A method for adjusting car volume based on noise curves and volume feedback includes the following steps:

[0014] Step 1: Noise Equation Data Acquisition. Various noises are tested based on variables such as different vehicle models, different vehicle speeds, and different window opening angles to obtain equation data reflecting the noise level. Inputting the noise factor value and using the equation data will yield the corresponding noise value. In addition to different vehicle models, different vehicle speeds, and different window opening angles, the noise factor also includes engine speed and relative wind speed. The noise factor value can be collected by the vehicle's sensors.

[0015] Step Two, First-Stage Adjustment: During vehicle operation, the collected vehicle operating data, namely the noise factor values ​​mentioned above, is input into the equation obtained in Step One for calculation. This yields the approximate ambient noise level during vehicle movement. The audio volume is then adjusted for the first time. Specifically, the user-set volume value in decibels is added to the current noise level to determine the required volume to counteract noise interference. The actual gain value of the audio system is then adjusted via the central control unit. However, it is important to note that the maximum gain should be within a pre-defined threshold to avoid excessively loud sound that could damage hearing, or gain values ​​exceeding the audio system's operating range that could cause distortion, popping, or even damage to the audio system.

[0016] Step three, the second-stage adjustment: After the first-stage adjustment, due to differences between the test environment and the real environment, as well as sensor errors and the influence of data that cannot be collected by sensors on vehicle ambient noise, there will be a discrepancy between the calculated noise level and the actual noise. The second-stage adjustment corrects this discrepancy. Real-time audio is recorded inside the vehicle to obtain the audio data. A Fourier transform is performed on the recorded data to obtain the sound spectrum. After eliminating the audio playback portion in the frequency domain, an inverse Fourier transform is performed to obtain the remaining noise volume in the time domain. This is compared with the time domain volume of the directly recorded audio before processing to determine the percentage error between the current noise volume and the calculated noise volume. The vehicle audio volume is then increased or decreased accordingly. Simultaneously, to prevent errors in the in-vehicle microphone reception from creating a positive feedback loop during adjustment, the adjustment range of the second stage should be limited, ensuring it only serves as a supplement and correction to the first-stage adjustment.

[0017] The noise equation data mentioned above is tested by the manufacturer before leaving the factory; the control of audio volume, Fourier transform and inverse Fourier transform of sound signals are controlled by the central control unit; vehicle operating data is collected by various sensors and aggregated to the central control unit through the bus system.

[0018] In step two, the audio data is collected by the in-car microphone, which communicates with the central control unit.

[0019] In step one, the noise data is the result of prior testing. The noise data is usually existing data provided by the car manufacturer. The equation data reflecting the noise level is calculated in real time through various noise parameters, and the equation data reflecting the noise level is stored in the central control unit of the vehicle.

[0020] In actual adjustments, the first-order adjustment based on the pre-determined curve is the primary adjustment, thus enabling real-time response to the main sound adjustment speed. The second-order adjustment, based on feedback from the in-car microphone, allows for precise control. Furthermore, since the second-order adjustment accounts for a smaller proportion and only serves a corrective function, it can mitigate the impact of errors caused by data anomalies at the central control unit's feedback receiver.

[0021] This invention employs pre-calculation of noise impact curves based on different vehicle models to obtain equation data reflecting noise levels. In sound feedback, it separates the sound played by the audio system from the noise, enabling it to quickly and accurately adjust the volume of the in-vehicle audio system automatically based on the noise level.

Claims

1. A method for adjusting car volume based on noise curves and volume feedback, characterized in that, Includes the following steps: Step 1: Noise equation data acquisition. Test the ambient noise level caused by each noise factor under different vehicle conditions, plot the test results as curves, and fit an equation that can reflect the noise level. Step 2, First-stage adjustment: The noise factor values ​​are detected in real time by various sensors in the car and input into the equation obtained in Step 1 to calculate the ambient noise level. After obtaining the noise data, the audio volume is adjusted for the first time. Step 3, second-stage adjustment: Real-time sound recording is performed inside the vehicle to obtain sound data. After performing a Fourier transform on the sound data, the sound spectrum is obtained. After eliminating the sound from the audio playback part in the frequency domain, an inverse Fourier transform is performed to obtain the volume of the remaining noise in the time domain. This volume is compared with the time domain volume of the direct sound recording before processing to determine the percentage of noise volume and audio volume at this time. If the percentage is lower than the preset threshold, the volume of the car audio system is adjusted accordingly.

2. The method for adjusting car volume based on noise curves and volume feedback according to claim 1, characterized in that, In step one, the noise factors involved in the measurement are those that can be collected by the car's built-in sensors. Based on the different values ​​of the noise factors, the equations in step one are used to fit an equation that can describe the relationship between the noise volume and various values. Then, the equation data reflecting the noise level is stored in the central control unit of the car.

3. The method for adjusting car volume based on noise curves and volume feedback according to claim 2, characterized in that, The audio volume control, Fourier transform conversion, and inverse Fourier transform of the audio signal are controlled by the central control unit.

4. The method for adjusting car volume based on noise curves and volume feedback according to claim 3, characterized in that, In step two, the audio data is collected by the in-car microphone, which communicates with the central control unit.