CN117221786B - Loudness compensation method of vehicle-mounted sound system and vehicle-mounted sound system - Google Patents
Loudness compensation method of vehicle-mounted sound system and vehicle-mounted sound system Download PDFInfo
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Abstract
The invention discloses a loudness compensation method of a vehicle-mounted sound system and the vehicle-mounted sound system, and belongs to the field of vehicle-mounted equipment. The loudness compensation method specifically comprises the following steps: step A, acquiring a plurality of actual windowing areas of a vehicle, and processing the plurality of actual windowing areas to obtain a plurality of weighted windowing areas; and B, obtaining a plurality of loudness compensation amounts according to the weighted windowing areas, wherein the loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers based on the loudness compensation amounts. According to the vehicle-mounted sound system, the loudness compensation is carried out on the plurality of speakers based on the loudness compensation quantity, so that the opening and closing conditions of all windows on the vehicle are comprehensively adjusted in a targeted manner, and the use experience of a user can be effectively improved.
Description
Technical Field
The invention belongs to the field of vehicle-mounted equipment, and particularly relates to a loudness compensation method of a vehicle-mounted sound system and the vehicle-mounted sound system.
Background
Current car entertainment systems typically have the ability to provide good audio quality, and in static situations, a better listening experience can be provided to the user. However, in a dynamic environment, the listening experience of the user will be disturbed by various factors, such as engine noise, tyre noise, road noise, etc. during driving. In addition, opening the windows during the driving of the vehicle can have a significant impact on the sound effects played by the car audio entertainment system, as opening the windows can alter the airflow and ambient noise levels within the vehicle, thereby affecting the loudness and quality of the music.
Although the volume output of loudspeaker can be automatically adjusted according to the opening degree of the windows of the existing part of vehicle-mounted sound systems, the opening and closing conditions of all windows on the vehicle cannot be comprehensively adjusted in a targeted manner, so that the user experience is poor.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide an improved loudness compensation method for a vehicle audio system and a vehicle audio system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method of loudness compensation for a vehicle audio system, comprising:
step A, acquiring a plurality of actual windowing areas of a vehicle, and processing the actual windowing areas to obtain a plurality of weighted windowing areas;
and B, obtaining a plurality of loudness compensation amounts according to the weighted windowing areas, wherein the loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers based on the loudness compensation amounts.
Preferably, the loudness compensation method of the vehicle audio system further includes step A0, located before step a: the user selects a loudness compensation mode that includes a sound field prioritization mode and a signal-to-noise ratio prioritization mode.
Further, step a includes step A1 and step A2, and if the loudness compensation mode in step A0 is a sound field priority mode, step A1 is skipped: acquiring a plurality of actual windowing areas of a vehicle, and processing the actual windowing areas to obtain a plurality of first weighted windowing areas;
if the loudness compensation mode in step A0 is the snr priority mode, then step A2 is skipped: and acquiring a plurality of actual windowing areas of the vehicle, and processing the actual windowing areas to obtain a plurality of second weighted windowing areas.
Further, the step A2 specifically includes:
step A21, calculating a plurality of second weighted windowing areas based on the following formula (1),
s is the second weighted windowing area, W is the weight coefficient, A is the actual windowing area, m is the seat number, N is the total number of the vehicle window, N is any one value of 1-N, and m and N are both positive integers.
Further, the weight coefficient W is set according to the distance from each seat to each window, respectively.
Further, the step A1 specifically includes:
step A11, calculating a plurality of first weighted windowing areas based on the following formula (2),
wherein S is a first weighted windowing area, A is an actual windowing area, M is the total number of seats, M is the number of seats and M is any one value of 1~M; n is the total number of the vehicle windows, N is any one value of 1-N, and m and N are positive integers.
Further, step B includes step B1 and step B2, and if the loudness compensation mode in step A0 is the sound field priority mode, step A1 jumps to step B1: obtaining a plurality of first loudness compensation amounts according to the first weighted windowing areas, wherein the first loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers according to the first loudness compensation amounts;
if the loudness compensation mode in step A0 is the snr priority mode, step A2 jumps to step B2: and obtaining a plurality of second loudness compensation amounts based on the second weighted windowing areas, wherein the second loudness compensation amounts respectively correspond to the loudspeakers one by one, and the corresponding loudspeakers are subjected to loudness compensation according to the second loudness compensation amounts.
Still further, step B1 includes:
step B11, comparing the plurality of first weighted windowing areas with a preset first loudness compensation table to obtain a plurality of first loudness compensation amounts;
and step B12, controlling the output volume increase of the plurality of speakers according to the plurality of first loudness compensation amounts, wherein the value of the output volume increase of each speaker is equal.
Still further, step B2 includes:
step B21, comparing the second weighted windowing areas with a preset second loudness compensation table respectively to obtain a plurality of second loudness compensation amounts;
and step B22, respectively controlling the output volume of the corresponding loudspeaker to increase according to a plurality of second loudness compensation amounts.
Further, before step A0, the loudness compensation method of the vehicle audio system further includes:
step S1, acquiring window opening degree information of a vehicle, judging whether the opening degree of each window in the window opening degree information is the same, and if not, jumping to the step A0.
Further, if the opening degree of each window in the window opening degree information is the same, the step S2 is skipped, and the step S2 includes: and performing loudness compensation on the output volume of the loudspeaker based on the window opening degree information.
A vehicle-mounted sound system comprises a vehicle-mounted entertainment module, a vehicle-mounted power amplifier module and a vehicle-mounted gateway module;
the vehicle-mounted sound system further comprises a vehicle window position detector, wherein the vehicle window position detector is used for detecting the opening degree of a vehicle window to obtain vehicle window opening degree information;
the vehicle-mounted entertainment module is used for transmitting digital audio signals to the vehicle-mounted power amplifier module through a vehicle-mounted bus;
the vehicle-mounted gateway module is used for receiving the window opening degree information sent by the window position detector and transmitting the window opening degree information to the vehicle-mounted power amplifier module through the vehicle-mounted bus;
the vehicle-mounted power amplification module is used for processing the vehicle window opening degree information to obtain the weighted windowing area of the vehicle, obtaining the loudness compensation quantity according to the weighted windowing area, and performing loudness compensation on the plurality of speakers based on the loudness compensation quantity.
Preferably, the window opening degree information includes an actual window opening area of the window.
Preferably, the vehicle audio system includes a sound field priority mode and a signal-to-noise ratio priority mode.
Further, when the vehicle-mounted sound system is in the sound field priority mode, the vehicle-mounted power amplification module is configured to obtain a plurality of first weighted windowing areas based on the window opening degree information, obtain a plurality of first loudness compensation amounts according to the plurality of first weighted windowing areas, and perform loudness compensation on a plurality of speakers according to the plurality of first loudness compensation amounts.
Further, when the vehicle-mounted sound system is in the signal-to-noise ratio priority mode, the vehicle-mounted power amplification module is configured to obtain a plurality of second weighted windowing areas based on the window opening degree information, obtain a plurality of second loudness compensation amounts based on the second weighted windowing areas, and respectively perform loudness compensation on a plurality of corresponding speakers according to the second loudness compensation amounts.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the vehicle-mounted sound system, the window opening degree information is obtained through the window position detector and is sent to the vehicle-mounted gateway module, the window opening degree information is sent to the vehicle-mounted power amplification module through the vehicle-mounted gateway module, a plurality of weighted windowing areas of a vehicle are obtained after the vehicle-mounted power amplification module processes the window opening degree information, a plurality of loudness compensation amounts are obtained according to the weighted windowing areas, and the loudness compensation is respectively carried out on a plurality of speakers based on the loudness compensation amounts, so that the purpose of pertinently adjusting each speaker for integrating the opening and closing conditions of all windows on the vehicle is achieved, and the use experience of a user can be effectively improved.
In a further preferred scheme, the user can select two different modes, namely a sound field priority mode and a signal to noise ratio priority mode, so that different modes can be selected according to own listening preference, and the loudness is compensated in a targeted manner after windowing, thereby further improving the use experience of the user.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of loudness compensation in an embodiment of the present invention;
FIG. 2 is another loudness compensation flow chart in an embodiment of the present invention;
FIG. 3 is a flow chart of another loudness compensation method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another loudness compensation method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of loudness compensation in a sound field priority mode of a vehicle audio system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a vehicle audio system according to an embodiment of the present invention;
1, a vehicle-mounted sound system; 2. a vehicle-mounted entertainment module; 3. a vehicle-mounted power amplifier module; 4. a vehicle-mounted gateway module; 5. and a window position detector.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 to 5, the vehicle audio system and the loudness compensation method in the present embodiment include:
step S1, acquiring window opening degree information of a vehicle, judging whether the opening degree of each window in the window opening degree information is the same, if not, jumping to step A0, and if so, jumping to step S2;
s2, performing loudness compensation on the output volume of the loudspeaker based on the window opening degree information;
a0, selecting a loudness compensation mode by a user, wherein the loudness compensation mode comprises a sound field priority mode and a signal-to-noise ratio priority mode;
step A, acquiring a plurality of actual windowing areas of a vehicle, and processing the plurality of actual windowing areas to obtain a plurality of weighted windowing areas;
and B, obtaining a plurality of loudness compensation amounts according to the weighted windowing areas, wherein the loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers based on the loudness compensation amounts.
The general principle of loudness compensation is that the larger the window area, the more external noise is likely to be transmitted into the vehicle, and the more compensation is required for the speaker. After the window opening degree information of the vehicle is obtained, judging whether the opening degree of each window in the window opening degree information is the same, and if the opening degree of each window is the same, directly performing loudness compensation on the output volume of the loudspeaker according to the window opening degree information. Taking two rows of cars with four windows as an example, when four windows are closed at the same time, no loudness compensation is required, and the compensation amount is 0dB. If four windows are open simultaneously, the amount of compensation of the loudspeaker is maximum, which may be 5dB, for example. If four windows are partially open, for example, the open area is 30% of the total window area, the amount of compensation is between 0dB and the maximum amount of compensation, which may be 2dB, for example. It should be noted that the compensation amounts corresponding to different window opening and closing degrees may be obtained through testing in advance, and the compensation amounts may be adjusted according to actual testing or user preference, which is not limited herein. In this embodiment, the window opening degree information specifically refers to an actual window opening area of the window, and in other embodiments, the descending height of the window or other parameters may be measured to calculate the window opening area, which is not limited herein. Considering that the window of the vehicle may be irregular, if only the descending height of the window is measured so as to infer that the loudness compensation amount may have a certain error, the opening area of the window can more intuitively reflect the influence of air flow and environmental noise in the vehicle on the loudness of music, so that the loudness compensation effect is better. When the opening degree of each car window is the same, the compensation values of the loudspeakers in all directions are equal, and the sound field of tuning of the car is effectively ensured.
If the opening degree of each window is different, the user may select any one of two loudness compensation modes, namely a sound field priority mode and a signal to noise ratio priority mode, and if the loudness compensation mode is the sound field priority mode, the step a specifically includes:
a1, acquiring a plurality of actual windowing areas of a vehicle, and processing the plurality of actual windowing areas to obtain a plurality of first weighted windowing areas;
the step A1 specifically comprises the following steps:
step A11, calculating a plurality of first weighted windowing areas based on the following formula (2),
wherein S is a first weighted windowing area, A is an actual windowing area, M is the total number of seats, M is the number of seats and M is any one value of 1~M; n is the total number of the vehicle windows, N is any one value of 1-N, and m and N are positive integers.
As shown in fig. 5, in the sound field priority mode, the compensation value of each speaker is still equal, and the areas of the four windows are calculated cumulatively, so as to determine the magnitude of the compensation value. Specifically, when four windows are closed simultaneously, there is no need to make loudness compensation, and the compensation amount is 0dB. If four windows are simultaneously opened, the amount of compensation of the speaker is maximized. When a part of the vehicle window is opened, the compensation amount is between 0dB and the maximum value of the compensation amount, and the larger the windowing area is, the larger the compensation amount is, and the smaller the windowing area is, the smaller the compensation amount is. For example, the window areas of the four windows are A1, A2, A3, and A4, respectively, and then the first weighted window area s= (1/M) × (a1+a2+a3+a4) = (1/4) × (a1+a2+a3+a4).
In the sound field priority mode, the step B specifically includes:
and B1, obtaining a plurality of first loudness compensation amounts according to the plurality of first weighted windowing areas, wherein the plurality of first loudness compensation amounts respectively correspond to the plurality of loudspeakers one by one, and performing loudness compensation on the plurality of loudspeakers according to the plurality of first loudness compensation amounts.
The step B1 specifically comprises the following steps:
step B11, comparing the plurality of first weighted windowing areas with a preset first loudness compensation table to obtain a plurality of first loudness compensation amounts;
step B12, controlling the output volume of the plurality of speakers to be increased according to the plurality of first loudness compensation amounts, wherein the value of the output volume increase of each speaker is equal.
The first loudness compensation table is obtained by a pre-subjective and objective test, and can be adjusted according to the actual test or the user preference in the actual application process, which is not limited herein.
If the loudness compensation mode is a signal-to-noise ratio priority mode, the step a specifically includes:
and A2, acquiring a plurality of actual windowing areas of the vehicle, and processing the plurality of actual windowing areas to obtain a plurality of second weighted windowing areas.
The step A2 specifically comprises the following steps:
step A21, calculating a plurality of second weighted windowing areas based on the following formula (1),
s is the second weighted windowing area, W is the weight coefficient, A is the actual windowing area, m is the seat number, N is the total number of the vehicle window, N is any one value of 1-N, and m and N are both positive integers.
Weight coefficient W mn By way of example of seat number 1 (m=1) to window number 1 (n=1), the weighting factor is M 11 . The weight coefficient W is adjusted according to different distances from each seat to four windows, and the distance is smaller as the distance is farther, and the distance is bigger as the distance is nearer. For example, the window areas of the four windows are A1, A2, A3 and A4, respectively, and when m=1, the window next to seat No. 1 corresponds to the second weighted window area S 1 =W 11 ×A 1 +W 12 ×A 2 +W 13 ×A 3 +W 14 ×A 4 . In the practical application process, the number of speakers arranged near each seat may be one or more. In particular, in the present embodiment, in the snr priority mode, it is assumed that there are four seats in the vehicle, according to the followingThe four seats are divided into four areas, and 5 speakers in the same seat area range can be equal or unequal in compensation amount provided that 5 speakers are arranged in each seat area range.
In the snr priority mode, step B specifically includes:
and B2, obtaining a plurality of second loudness compensation amounts based on the plurality of second weighted windowing areas, wherein the plurality of second loudness compensation amounts respectively correspond to the plurality of speakers one by one, and respectively carrying out loudness compensation on the corresponding plurality of speakers according to the plurality of second loudness compensation amounts.
The step B2 specifically comprises the following steps:
step B21, comparing the plurality of second weighted windowing areas with a preset second loudness compensation table respectively to obtain a plurality of second loudness compensation amounts;
and step B22, respectively controlling the output volume of the corresponding loudspeaker to be increased according to the plurality of second loudness compensation quantities.
The second loudness compensation table is shown below with reference to table 1:
for example, calculate the second weighted windowing area S corresponding to the window next to seat No. 1 1 The output volume of the speakers in seat area No. 1 increases by 2dB, accounting for approximately 30% of the total area of window No. 1. The second loudness compensation table is obtained by a pre-subjective and objective test, and can be adjusted or further refined according to the actual test or the user preference in the actual application process, which is not limited herein.
The embodiment also comprises a vehicle-mounted sound system 1, as shown in fig. 6, which comprises a vehicle-mounted entertainment module 2, a vehicle-mounted power amplifier module 3 and a vehicle-mounted gateway module 4. The vehicle-mounted sound system 1 further comprises a vehicle window position detector 5, wherein the vehicle window position detector 5 is used for detecting the opening degree of the vehicle window to obtain vehicle window opening degree information, and the vehicle window opening degree information specifically comprises the actual opening area of the vehicle window.
Specifically, the in-vehicle entertainment module 2 is configured to stream digital audio signals to the in-vehicle power amplifier module 3 via the in-vehicle bus. The vehicle-mounted gateway module 4 is used for receiving the window opening degree information sent by the window position detector 5 and transmitting the window opening degree information to the vehicle-mounted power amplifier module 3 through the vehicle-mounted bus. The vehicle-mounted power amplification module 3 is used for processing the vehicle window opening degree information to obtain the weighted windowing area of the vehicle, obtaining the loudness compensation quantity according to the weighted windowing area, and performing loudness compensation on the plurality of speakers based on the loudness compensation quantity. The vehicle-mounted sound system comprises a sound field priority mode and a signal to noise ratio priority mode, when the vehicle-mounted sound system is in the sound field priority mode, the vehicle-mounted power amplification module 3 is configured to obtain a plurality of first weighted windowing areas based on window opening degree information, obtain a plurality of first loudness compensation amounts according to the plurality of first weighted windowing areas, and perform loudness compensation on a plurality of speakers according to the plurality of first loudness compensation amounts. When the vehicle-mounted sound system is in the signal-to-noise ratio priority mode, the vehicle-mounted power amplification module 3 is configured to obtain a plurality of second weighted windowing areas based on the vehicle window opening degree information, obtain a plurality of second loudness compensation amounts based on the second weighted windowing areas, and respectively perform loudness compensation on a plurality of corresponding speakers according to the second loudness compensation amounts. The specific two modes are as described above and are not described in detail herein.
The vehicle power amplifier module 3 specifically includes an amplifier for a car audio system, and is mainly used for amplifying audio signals to improve the loudness and quality of audio. The vehicle-mounted power amplification module 3 is specifically composed of a plurality of amplifiers, and each amplifier is responsible for amplifying audio signals in different frequency ranges and specifically comprises different parameters such as power, channel number, type and quality. The vehicle-mounted power amplifier module 3 further comprises a controller, wherein the controller is used for calculating the weighted windowing area after analyzing the window opening degree information, obtaining the loudness compensation quantity and further controlling the plurality of speakers.
The on-board bus (controller area network, CAN) is a communication protocol used in automotive and industrial applications. It is a two-wire bus allowing communication between a plurality of electronic control units (electronic control unit, ECU) without the need for a central computer. The on-board bus is used to transfer data between the various ECUs, such as the engine control unit, transmission control unit, and body control module. The vehicle bus is a powerful and reliable communication protocol and is widely applied to the automobile industry. It is designed to operate in harsh environments and can withstand high levels of electrical noise and interference. In this embodiment, the interaction between the vehicle-mounted power amplifier module 3 and the vehicle-mounted bus is realized through data transmission on the CAN bus. When the vehicle-mounted entertainment module 2 plays the audio signal, the digital audio signal is transmitted to the vehicle-mounted power amplifier module 3, and meanwhile, the vehicle-mounted entertainment module 2 CAN adjust the played volume, tone quality and the like by sending a CAN signal to the vehicle-mounted power amplifier module 3 for control.
The vehicle gateway module 4 is mainly used for communication, and forwards signals (such as CAN signals, LIN signals, etc.) of different functional area networks or subnetworks. In this embodiment, the vehicle gateway module 4 forwards the window opening degree information of the vehicle body area network or the subnetwork to the subnetwork of the vehicle power amplifier module 3. The window opening degree information is embodied in a vehicle-mounted CAN bus signal WinPosnSts_Perc, for example, the real-time state is refreshed at a period of 100ms, and the WinPosnSts_Perc is totally called WinPositionStatus_Percentage, namely, the window state Percentage, and represents a window opening degree signal.
In summary, the vehicle audio system and the loudness compensation method in the embodiment have the following advantages:
1. the vehicle window opening degree information is obtained through the vehicle window position detector and is sent to the vehicle-mounted gateway module, the vehicle-mounted gateway module sends the vehicle window opening degree information to the vehicle-mounted power amplification module, a plurality of weighted windowing areas of the vehicle are obtained after the vehicle-mounted power amplification module processes the vehicle-mounted power amplification module, a plurality of loudness compensation amounts are obtained according to the weighted windowing areas, and the loudness compensation is respectively carried out on a plurality of speakers based on the loudness compensation amounts, so that the opening and closing conditions of all vehicle windows on the vehicle are comprehensively adjusted in a targeted manner for each speaker, and the use experience of a user can be effectively improved;
2. the user can select two different modes, namely a sound field priority mode and a signal to noise ratio priority mode, so that different modes can be selected according to the listening preference of the user, the loudness is compensated in a targeted manner after windowing, and the use experience of the user is further improved;
3. the actual windowing area of the car window is measured, so that the weighted windowing area is obtained, the influence of air flow and environmental noise in the car on the loudness of music can be reflected more intuitively, and the effect of loudness compensation is better.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present invention are merely with respect to the mutual positional relationship of the constituent elements of the present invention in the drawings.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention. All equivalent changes or modifications made according to the principles of the present invention should be construed to be included within the scope of the present invention.
Claims (10)
1. A method for loudness compensation in a vehicle audio system, comprising:
step A, acquiring a plurality of actual windowing areas of a vehicle, and processing the actual windowing areas to obtain a plurality of weighted windowing areas;
step B, obtaining a plurality of loudness compensation amounts according to the weighted windowing areas, wherein the loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers based on the loudness compensation amounts;
the loudness compensation method of the vehicle-mounted sound system further comprises a step A0 positioned before the step A: selecting a loudness compensation mode by a user, wherein the loudness compensation mode comprises a sound field priority mode and a signal-to-noise ratio priority mode;
step a includes step A1 and step A2, and if the loudness compensation mode in step A0 is a sound field priority mode, jump to step A1: acquiring a plurality of actual windowing areas of a vehicle, and processing the actual windowing areas to obtain a plurality of first weighted windowing areas;
if the loudness compensation mode in step A0 is the snr priority mode, then step A2 is skipped: acquiring a plurality of actual windowing areas of a vehicle, and processing the actual windowing areas to obtain a plurality of second weighted windowing areas;
the step A2 specifically comprises the following steps:
step A21, calculating a plurality of second weighted windowing areas based on the following formula (1),
（1）
s is the second weighted windowing area, W is the weight coefficient, A is the actual windowing area, m is the seat number, N is the total number of the vehicle window, N is any one value of 1-N, and m and N are both positive integers.
2. The loudness compensation method of a car audio system according to claim 1, wherein the weight coefficients W are set separately according to the distance from each seat to each window.
3. The method for loudness compensation of a vehicle audio system according to claim 1, wherein step A1 specifically comprises:
step A11, calculating a plurality of first weighted windowing areas based on the following formula (2),
（2）
wherein S is a first weighted windowing area, A is an actual windowing area, M is the total number of seats, M is the number of seats and M is any one value of 1~M; n is the total number of the vehicle windows, N is any one value of 1-N, and m and N are positive integers.
4. The method according to claim 1, wherein step B includes step B1 and step B2, and if the loudness compensation mode in step A0 is a sound field priority mode, step A1 jumps to step B1: obtaining a plurality of first loudness compensation amounts according to the first weighted windowing areas, wherein the first loudness compensation amounts respectively correspond to the loudspeakers one by one, and performing loudness compensation on the loudspeakers according to the first loudness compensation amounts;
if the loudness compensation mode in step A0 is the snr priority mode, step A2 jumps to step B2: and obtaining a plurality of second loudness compensation amounts based on the second weighted windowing areas, wherein the second loudness compensation amounts respectively correspond to the loudspeakers one by one, and the corresponding loudspeakers are subjected to loudness compensation according to the second loudness compensation amounts.
5. The method of loudness compensation in a vehicle audio system according to claim 4, wherein step B1 comprises:
step B11, comparing the plurality of first weighted windowing areas with a preset first loudness compensation table to obtain a plurality of first loudness compensation amounts;
and step B12, controlling the output volume increase of the plurality of speakers according to the plurality of first loudness compensation amounts, wherein the value of the output volume increase of each speaker is equal.
6. The method of loudness compensation in a vehicle audio system according to claim 4, wherein step B2 comprises:
step B21, comparing the second weighted windowing areas with a preset second loudness compensation table respectively to obtain a plurality of second loudness compensation amounts;
and step B22, respectively controlling the output volume of the corresponding loudspeaker to increase according to a plurality of second loudness compensation amounts.
7. The method of loudness compensation of a vehicle audio system according to claim 1, wherein prior to step A0, the method of loudness compensation of a vehicle audio system further comprises:
step S1, acquiring window opening degree information of a vehicle, judging whether the opening degree of each window in the window opening degree information is the same, and if not, jumping to the step A0.
8. The method for loudness compensation of a vehicle audio system according to claim 7, wherein if the opening degree of each window in the window opening degree information is the same, the step S2 is skipped to step S2, where step S2 includes: and performing loudness compensation on the output volume of the loudspeaker based on the window opening degree information.
9. A vehicle-mounted sound system comprises a vehicle-mounted entertainment module, a vehicle-mounted power amplifier module and a vehicle-mounted gateway module;
it is characterized in that the method comprises the steps of,
the vehicle-mounted sound system further comprises a vehicle window position detector, wherein the vehicle window position detector is used for detecting the opening degree of a vehicle window to obtain vehicle window opening degree information;
the vehicle-mounted entertainment module is used for transmitting digital audio signals to the vehicle-mounted power amplifier module through a vehicle-mounted bus;
the vehicle-mounted gateway module is used for receiving the window opening degree information sent by the window position detector and transmitting the window opening degree information to the vehicle-mounted power amplifier module through the vehicle-mounted bus;
the vehicle-mounted power amplification module is used for processing the vehicle window opening degree information to obtain a weighted windowing area of a vehicle, obtaining a loudness compensation quantity according to the weighted windowing area, and performing loudness compensation on a plurality of speakers based on the loudness compensation quantity;
the window opening degree information comprises the actual window opening area of the window;
the vehicle-mounted sound system comprises a sound field priority mode and a signal-to-noise ratio priority mode;
when the vehicle-mounted sound system is in the signal-to-noise ratio priority mode, the vehicle-mounted power amplification module is configured to obtain a plurality of second weighted windowing areas based on the window opening degree information, obtain a plurality of second loudness compensation amounts based on the second weighted windowing areas, and respectively perform loudness compensation on a plurality of corresponding speakers according to the second loudness compensation amounts;
the vehicle-mounted power amplifier module is used for calculating the second weighted windowing areas according to the following formula (1),
（1）
s is the second weighted windowing area, W is the weight coefficient, A is the actual windowing area, m is the seat number, N is the total number of the vehicle window, N is any one value of 1-N, and m and N are both positive integers.
10. The vehicle audio system of claim 9, wherein when the vehicle audio system is in the sound field priority mode, the vehicle power amplifier module is configured to obtain a plurality of first weighted windowing areas based on the window opening degree information, obtain a plurality of first loudness compensation amounts according to the plurality of first weighted windowing areas, and loudness compensate a plurality of speakers according to the plurality of first loudness compensation amounts.
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