Windowing sound effect compensation method and system of vehicle-mounted sound system

Abstract

The invention discloses a windowing sound effect compensation method and system for a vehicle-mounted sound system, and the method comprises the steps: obtaining windowing signals of all windows of a vehicle, generating an actual windowing matrix, searching a balance compensation matrix table of a corresponding loudspeaker based on the actual windowing matrix, and obtaining an actual balance compensation value of each loudspeaker; the real-time vehicle speed of the vehicle is obtained, and the background noise compensation matrix table of the corresponding loudspeaker is searched based on the vehicle speed to obtain the actual covering compensation value of each loudspeaker; and superposing the actual equilibrium compensation value and the actual masking compensation value to generate a total compensation value, and correspondingly endowing the total compensation value to the equilibrium frequency response curve of each loudspeaker to realize windowing sound effect compensation. According to the invention, the balance compensation of the loudspeaker under different windowing proportions is combined with the covering compensation after windowing in the dynamic state of the vehicle, so that the total sound effect compensation is realized, the sound effect loss can be effectively reduced, and the advanced experience feeling of people in the vehicle is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a method and system for compensating window opening sound effects of a vehicle-mounted audio system. Background Art

[0002] With the rapid development of new energy, the car audio system is also developing rapidly towards the trend of more speakers and higher amplifier power. The vehicle audio system and its effects have become one of the selling points of the car and are becoming more and more prominent.

[0003] In the tuning of car audio, the OEM or system supplier mainly performs tuning when the vehicle is parked in place with all doors and windows closed, and uses this as a benchmark, which is called static tuning. Tuners usually use audio test equipment to test the frequency response characteristics and delay characteristics of speakers and amplifier systems, and complete the tuning parameter settings of each speaker and each audio channel in turn to achieve better sound effects for the entire vehicle. After the static tuning is completed, algorithm compensation is also required for dynamic working conditions to ensure the in-car sound effects under the interference of background noise such as road noise and wind noise while the car is moving on the road. This is called dynamic tuning. Generally, dynamic tuning is also performed with all doors and windows completely closed.

[0004] However, in actual use, car users often open the windows in place or while moving for air convection or temperature control. At this time, the noise outside the car and the open structure of the cabin sound cavity will have a significant impact on the sound effect of the entire vehicle. This sound effect loss reduces the user's high-end experience.

[0005] The patent discloses a loudness compensation method and a vehicle-mounted audio system, and provides a solution. By obtaining multiple actual window opening areas of the vehicle and performing weighted processing, corresponding loudness compensation is performed. The vehicle-mounted audio system in the invention performs loudness compensation on multiple speakers based on the loudness compensation amount, thereby achieving targeted adjustment of each speaker based on the opening and closing conditions of all windows in the vehicle. The patent has the following defects:

[0006] First, the loudness compensation in this invention actually increases the volume amplitude of each speaker to varying degrees after the window is opened, without considering the spectrum masking characteristics of the background noise and the changes in the cabin acoustic cavity characteristics after the window is opened.

[0007] Secondly, the loudness compensation in the invention is based on the sum of the weighted window opening areas as the basis for the volume increase amplitude. In fact, the external opening structure of the cabin sound cavity under the same window opening area and different window opening combinations is different, and the transmission characteristics of the sound field are different, which directly affects the frequency response characteristics of the speaker. Summary of the invention

[0008] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a method and system for compensating the window opening sound effect of a vehicle audio system.

[0009] The technical solution adopted by the present invention is: a method for compensating the window opening sound effect of a vehicle-mounted audio system,

[0010] Obtain window opening signals of all vehicle windows to generate an actual window opening matrix, and search the equalization compensation matrix table of the corresponding speaker based on the actual window opening matrix to obtain the actual equalization compensation value of each speaker;

[0011] Obtain the real-time speed of the vehicle, and search the background noise compensation matrix table of the corresponding speaker based on the speed to obtain the actual masking compensation value of each speaker;

[0012] The actual equalization compensation value and the actual masking compensation value are superimposed to generate a total compensation value, and the total compensation value is assigned to the equalization frequency response curve of each speaker to achieve window sound effect compensation.

[0013] Furthermore, the determination process of the equalization compensation matrix table is as follows:

[0014] When all the windows are fully closed, measure the closed frequency response curve from each speaker to the listening position; for each calibrated window matrix, measure the window frequency response curve from each speaker to the listening position in the window open state; calculate the difference between the window open frequency response curve and the closed frequency response curve as the theoretical equalization compensation value of the corresponding speaker under the corresponding calibrated window matrix, and the theoretical equalization compensation values ​​of all speakers under all calibrated window matrices constitute an equalization compensation matrix table.

[0015] Furthermore, the closed frequency response curve and the windowed frequency response curve are both frequency response curves at 1 / 3 octave.

[0016] Furthermore, if the corresponding calibrated window opening matrix cannot be found in the balanced compensation matrix table based on the actual window opening matrix, multiple standard window opening matrices are searched based on the actual window opening matrix on the principle of being adjacent to the actual vehicle window opening, and the average value of the theoretical balanced compensation values ​​corresponding to the multiple standard window opening matrices is calculated, and the calculated average value is used as the actual balanced compensation value.

[0017] Furthermore, the background noise compensation matrix table is determined as follows:

[0018] When the vehicle speed is 0, the theoretical masking compensation value of the background noise compensation matrix table is set to 0, and the parking background noise curve from each speaker to the listening position is measured; when the vehicle speed is greater than 0, the driving background noise curve from each speaker to the listening position at each discrete vehicle speed is measured, and the theoretical masking compensation value of the corresponding speaker at the corresponding discrete vehicle speed is obtained according to the parking background noise curve and the driving background noise curve. The theoretical masking compensation values ​​of all speakers at all discrete vehicle speeds constitute the background noise compensation matrix table.

[0019] Furthermore, the process of obtaining the theoretical masking compensation value of the corresponding speaker at the corresponding discrete vehicle speed based on the parking background noise curve and the driving background noise curve is: calculating the difference between the driving background noise curve and the parking background noise curve as the initial equalization compensation value of the corresponding speaker at the corresponding discrete vehicle speed, and multiplying the initial compensation value by the set compensation coefficient to obtain the theoretical equalization compensation value of the corresponding speaker at the corresponding discrete vehicle speed.

[0020] Furthermore, the discrete vehicle speed is a discrete point with a set vehicle speed as a resolution, and the intermediate vehicle speed between the discrete points is incorporated into the discrete point in a rounded manner.

[0021] Furthermore, after the total compensation value is generated, the total compensation value is corrected based on the limit values ​​of different frequency bands of the loudspeaker, and the corrected total compensation value is assigned to the equalization frequency response curve of each loudspeaker accordingly.

[0022] Furthermore, the correction process is: if the absolute value of the total compensation value of the speaker in the corresponding frequency band is greater than the limit value, the size of the corrected total compensation value is the limit value, and the positive and negative sign are the same as the original total compensation value; otherwise, the original total compensation value remains unchanged.

[0023] A window opening sound effect compensation system for a vehicle-mounted audio system, comprising

[0024] A first compensation module is used to obtain window opening signals of all vehicle windows to generate an actual window opening matrix, and to search the equalization compensation matrix table of the corresponding speaker based on the actual window opening matrix to obtain an actual equalization compensation value of each speaker;

[0025] The second compensation module is used to obtain the real-time speed of the vehicle, and to search the background noise compensation matrix table corresponding to the speaker based on the speed to obtain the actual masking compensation value of each speaker;

[0026] The third compensation module is used to superimpose the actual equalization compensation value and the actual masking compensation value to generate a total compensation value, and assign the total compensation value to the equalization frequency response curve of each speaker.

[0027] The beneficial effects of the present invention are:

[0028] The present invention combines the balanced compensation of speakers under different window opening ratios with the masking compensation after window opening under vehicle dynamics to achieve total sound effect compensation, which can effectively reduce sound effect loss and improve the high-level experience of people in the car.

[0029] The equalization compensation matrix table of the present invention is obtained by measuring the difference between the frequency response curves of each speaker to the listening position under different window opening combinations and the frequency response curve when the car window is completely closed. This method specifically considers the tuning curve and the gain of different frequency bands, and is effective in correcting the sound effect and reducing the sound effect loss.

[0030] The present invention adopts an interpolation method to cover more detailed window combinations for combinations of different window opening states, thereby reducing the size of the vehicle window matrix, thereby reducing the size of the equalization compensation matrix table, further reducing the calculation load of the chip in the vehicle, and improving the efficiency of sound compensation.

[0031] In the process of superimposing the background noise compensation amount and the window equalization compensation amount at different vehicle speeds of the present invention, a limit value is set to constrain the absolute value of the final compensation value, thereby avoiding the problem of sudden sound effects caused by excessive compensation value under a single octave band, and further improving the passenger experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] like Figure 1 As shown, the present invention provides a method for compensating the window opening sound effect of a vehicle-mounted audio system, comprising the following steps:

[0035] Step 1, obtain the window opening signals of all the window glasses of the vehicle, generate an actual window opening matrix, and search the equalization compensation matrix table A1 of the corresponding speaker based on the actual window opening matrix to obtain the actual equalization compensation value C1 of each speaker.

[0036] Step 2, obtaining the real-time speed V of the vehicle, and searching the background noise compensation matrix table A2 corresponding to the speaker based on the vehicle speed V to obtain the actual masking compensation value C2 of each speaker.

[0037] Step 3: superimpose the actual equalization compensation value C1 obtained in step 1 and the actual masking compensation value C2 obtained in step 2 to generate a total compensation value C3.

[0038] In the above step 1, the determination process of the equalization compensation matrix table is as follows: first, when all the windows are fully closed, the closed frequency response curve from each speaker to the listening position is measured, that is, when the windows are fully closed, each speaker has a corresponding frequency response curve under 1 / 3 octave; then, for each calibrated window opening matrix, the window opening frequency response curve from each speaker to the listening position in the window opening state is measured, that is, each speaker has a corresponding frequency response curve under 1 / 3 octave under each window opening combination; finally, the difference between the window opening frequency response curve and the closed frequency response curve (that is, the difference between the corresponding discrete points on the curve) is calculated as the theoretical equalization compensation value of the corresponding speaker under the corresponding calibrated window opening matrix, and the theoretical equalization compensation values ​​of all speakers under all calibrated window opening matrices constitute the equalization compensation matrix table.

[0039] The window opening matrix is ​​obtained through the window glass lifter motor signal. For a 4-door car, a matrix such as [FLFR RL RR] can be obtained, which corresponds to the opening degree of each door. For example, the left front door window is opened 20%, the right front door window is opened 40%, the left rear door window is opened 60%, and the right rear door window is opened 80%, then the window opening matrix [20% 40% 60% 80%] can be obtained. Assuming that the resolution of the opening ratio of each door and window is 20%, that is, each door and window has 5 opening conditions, namely 20%, 40%, 60%, 80% until 100% fully opened, then the opening conditions of the 4 doors and windows of the whole car are 5*5*5*5, a total of 625. For each window opening combination, the window opening frequency response curve from each speaker to the listening position in the window opening state is tested respectively, which is equivalent to the difference of the closed frequency response curve when the window is fully closed. Generally, the frequency response curve under 1 / 3 octave, that is, the difference of 31 frequency points in the audible range, is selected as the theoretical equalization compensation value under this window opening combination, thereby forming the equalization compensation matrix table A1.

[0040] In addition, in the above step 1, in order to reduce the size of the window matrix and refine the window combination method, an interpolation calculation method is used to cover more detailed window combinations, and then determine the balanced compensation value. That is, if the corresponding calibrated window matrix cannot be found in the balanced compensation matrix table based on the actual window matrix, multiple standard window matrices are found based on the actual window matrix on the principle of being adjacent to the actual window opening (i.e., interpolation method), and the average value of the theoretical balanced compensation values ​​corresponding to the multiple standard window matrices is calculated, and the calculated average value is used as the actual balanced compensation value.

[0041] For example, when the resolution of the calibrated window opening matrix is ​​20%, if the actual window opening resolution is 10%, there may be a situation where the actual window opening situation cannot be found in the calibrated window opening matrix. For example, the actual window opening situation is [30% 40% 40% 40%], but there is no such combination matrix in the calibrated window opening matrix. At this time, find the two window openings adjacent to 30%, and keep the other window openings unchanged (the other openings are the openings in the standard window opening matrix). Finally, the window opening matrices selected from the balanced compensation matrix table A1 are [20% 40% 40% 40%] and [40% 40% 40% 40%]. Then, the frequency response curves corresponding to these two window opening situations are averaged to obtain the frequency response compensation value of the window opening situation [30% 40% 40% 40%]. For complex window opening conditions such as [30% 50% 70% 50%], it is necessary to look up the table and select 16 window opening conditions for averaging, i.e., 20% and 40% for the left front door, 40% and 60% for the right front door, 60% and 80% for the left rear door, and 40% and 60% for the right rear door, for a total of 16 window opening conditions. And so on.

[0042] In the above step 2, the process of determining the background noise compensation matrix table is as follows: when the vehicle speed is 0, that is, it corresponds to static tuning, the compensation value of the background noise compensation matrix table is set to 0, and the parking background noise curve from each speaker to the listening position is measured at this time; when the vehicle speed is greater than 0, the background noise curve from each speaker to the listening position is measured at each discrete vehicle speed; according to the parking background noise curve and the driving background noise curve, the theoretical masking compensation value within one-third octave band of the corresponding speaker at the corresponding discrete vehicle speed is calculated based on the masking effect and the equal loudness curve, and the theoretical masking compensation values ​​of all speakers at all discrete vehicle speeds (including the vehicle speed of 0) constitute the background noise compensation matrix table A2.

[0043] The above process of calculating the theoretical masking compensation value of the corresponding loudspeaker at the corresponding discrete vehicle speed based on the parking background noise curve and the driving background noise curve based on the masking effect and the equal loudness curve is as follows: calculating the difference between the driving background noise curve and the parking background noise curve (i.e., the difference between the corresponding discrete points on the curve) as the initial equalization compensation value of the corresponding loudspeaker at the corresponding discrete vehicle speed, and multiplying the initial compensation value by the set compensation coefficient to obtain the theoretical equalization compensation value of the corresponding loudspeaker at the corresponding discrete vehicle speed. The parking background noise curve and the driving background noise curve are preferably frequency response curves at 1 / 3 octave, but are not limited to such curves, and may also be frequency response curves of other frequency bands.

[0044] The above-mentioned discrete speeds are discrete points with the set speed as the resolution. The set speed can be 5Km / h, 10Km / h or 20Km / h. When the set speed is 10Km / h, each discrete speed is 10Km / h, 20Km / h, 30Km / h, etc. Because the background noise at similar speeds is not significantly different, the intermediate speeds between the discrete speeds are rounded off and incorporated into the discrete points. That is, in the actual driving process, if the real-time speed is 32Km / h, the corresponding discrete speed is 30Km / h, and the actual masking compensation value is obtained by looking up the table at this speed; if the real-time speed is 35Km / h, the corresponding discrete speed is 40Km / h, and the actual masking compensation value is obtained by looking up the table at this speed.

[0045] In the above step 3, after the actual equalization compensation value C1 and the actual masking compensation value C2 are superimposed to obtain the total compensation value, the total compensation value needs to be corrected or limited based on the limit values ​​of different frequency bands of the speaker, and the corrected or limited total compensation value is assigned to the equalization frequency response curve of each speaker to avoid the problem of sudden sound effects caused by excessive compensation value under a single octave. The correction or limitation process is specifically that if the absolute value of the total compensation value of the speaker in the corresponding frequency band is greater than the limit value, which is generally a positive value, then the size of the corrected total compensation value is equal to the limit value, and the positive and negative values ​​are the same as the positive and negative values ​​of the original total compensation value, that is, the correction only changes the size but not the positive and negative values; otherwise, the original total compensation value remains unchanged.

[0046] For example, under a certain window opening condition and a certain vehicle speed, the actual equalization compensation value C1 and the actual masking compensation value C2 of a certain speaker in the car within the 1000Hz one-third octave band are 3dB and 4dB respectively, then the superimposed sum is 7dB, the limit value is 6dB, and the total compensation value C3 is set to 6dB; under a certain window opening condition and a certain vehicle speed, the equalization compensation value C1 and the masking compensation value C2 of a certain speaker in the car within the 50Hz one-third octave band are -3dB and -4dB respectively, then the superimposed sum is -7dB, the limit value is 6dB, and the total compensation value C3 is set to -6dB.

[0047] The present invention also provides a window opening sound effect compensation system for a vehicle-mounted audio system, comprising:

[0048] A first compensation module is used to obtain window opening signals of all vehicle windows to generate an actual window opening matrix, and to search the equalization compensation matrix table of the corresponding speaker based on the actual window opening matrix to obtain an actual equalization compensation value of each speaker;

[0049] The second compensation module is used to obtain the real-time speed of the vehicle, and to search the background noise compensation matrix table corresponding to the speaker based on the speed to obtain the actual masking compensation value of each speaker;

[0050] The third compensation module is used to superimpose the actual equalization compensation value and the actual masking compensation value to generate a total compensation value, and assign it to the equalization frequency response curve of each speaker accordingly.

[0051] The specific functions of the above-mentioned compensation modules are realized through the above-mentioned sound effect compensation method.

[0052] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0053] In order to make the description of the present disclosure more detailed and complete, the above description is provided for the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0054] Those skilled in the art may also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention may be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly demonstrate the interchangeability of hardware and software, the various illustrative components, units, and steps described above have generally described their functions. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present invention.

[0055] The various illustrative logic blocks or units described in the embodiments of the present invention can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or any combination of the above. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0056] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A method for compensating window opening sound effects of a vehicle audio system, characterized in that: Obtain window opening signals of all vehicle windows to generate an actual window opening matrix, and search the equalization compensation matrix table of the corresponding speaker based on the actual window opening matrix to obtain the actual equalization compensation value of each speaker; Obtain the real-time speed of the vehicle, and search the background noise compensation matrix table of the corresponding speaker based on the speed to obtain the actual masking compensation value of each speaker; The actual equalization compensation value and the actual masking compensation value are superimposed to generate a total compensation value, which is assigned to the equalization frequency response curve of each speaker to achieve window sound effect compensation.

2. The window opening sound effect compensation method of the vehicle audio system according to claim 1, characterized in that: The determination process of the equalization compensation matrix table is as follows: When all windows are fully closed, measure the closed frequency response curve from each speaker to the listening position; for each calibrated window matrix, measure the window frequency response curve from each speaker to the listening position in the window open state; The difference between the windowed frequency response curve and the closed frequency response curve is calculated as the theoretical equalization compensation value of the corresponding speaker under the corresponding calibrated window matrix. The theoretical equalization compensation values ​​of all speakers under all calibrated window matrices constitute an equalization compensation matrix table.

3. The window opening sound effect compensation method of the vehicle audio system according to claim 2, characterized in that: The closed frequency response curve and the windowed frequency response curve are both frequency response curves at 1 / 3 octave.

4. The window opening sound effect compensation method of the vehicle audio system according to claim 1, characterized in that: If the corresponding calibrated window opening matrix cannot be found in the balance compensation matrix table based on the actual window opening matrix, then multiple standard window opening matrices are found based on the actual window opening matrix on the principle of being adjacent to the actual vehicle window opening, and the average value of the theoretical balance compensation values ​​corresponding to the multiple standard window opening matrices is calculated, and the calculated average value is used as the actual balance compensation value.

5. The window opening sound effect compensation method of the vehicle audio system according to claim 1, characterized in that: The process of determining the background noise compensation matrix is ​​as follows: When the vehicle speed is 0, the theoretical masking compensation value of the background noise compensation matrix table is set to 0, and the parking background noise curve from each speaker to the listening position is measured; when the vehicle speed is greater than 0, the driving background noise curve from each speaker to the listening position at each discrete vehicle speed is measured, and the theoretical masking compensation value of the corresponding speaker at the corresponding discrete vehicle speed is obtained according to the parking background noise curve and the driving background noise curve. The theoretical masking compensation values ​​of all speakers at all discrete vehicle speeds constitute the background noise compensation matrix table.

6. The window opening sound effect compensation method of the vehicle audio system according to claim 5, characterized in that: The process of obtaining the theoretical masking compensation value of the corresponding speaker at the corresponding discrete vehicle speed according to the parking background noise curve and the driving background noise curve is as follows: The difference between the driving background noise curve and the parking background noise curve is calculated as the initial equalization compensation value of the corresponding speaker at the corresponding discrete vehicle speed, and the initial compensation value is multiplied by the set compensation coefficient to obtain the theoretical equalization compensation value of the corresponding speaker at the corresponding discrete vehicle speed.

7. The window opening sound effect compensation method of the vehicle audio system according to claim 5, characterized in that: The discrete vehicle speed is a discrete point with a set vehicle speed as a resolution, and the intermediate vehicle speed between the discrete points is incorporated into the discrete point in a rounded manner.

8. The window opening sound effect compensation method of the vehicle audio system according to claim 1, characterized in that: After the total compensation value is generated, the total compensation value is corrected based on the limit values ​​of different frequency bands of the speaker, and the corrected total compensation value is assigned to the equalization frequency response curve of each speaker.

9. The window opening sound effect compensation method of the vehicle audio system according to claim 8, characterized in that: The correction process is as follows: if the absolute value of the total compensation value of the loudspeaker in the corresponding frequency band is greater than the limit value, the magnitude of the corrected total compensation value is the limit value, and the positive and negative sign are the same as the original total compensation value; otherwise, the original total compensation value remains unchanged.

10. A window opening sound effect compensation system for a vehicle audio system, characterized in that: include A first compensation module is used to obtain window opening signals of all vehicle windows to generate an actual window opening matrix, and to search the equalization compensation matrix table of the corresponding speaker based on the actual window opening matrix to obtain an actual equalization compensation value of each speaker; The second compensation module is used to obtain the real-time speed of the vehicle, and to search the background noise compensation matrix table corresponding to the speaker based on the speed to obtain the actual masking compensation value of each speaker; The third compensation module is used to superimpose the actual equalization compensation value and the actual masking compensation value to generate a total compensation value, and assign it to the equalization frequency response curve of each speaker accordingly.

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