Control method for sound partition in space, electronic equipment, vehicle and medium

Abstract

The embodiment of the invention provides a control method for sound partitions in a space, electronic equipment, a vehicle and a medium, and the method comprises the steps: determining a first sound source pulse response of a target sound field, the first sound source pulse response being a pulse response of a preset sound source in front of the target sound field; and based on an electro-acoustic transfer function of a bright area, the first sound source pulse response, an electro-acoustic transfer function of a dark area and an optimization function, determining a driving signal of each loudspeaker, namely, restraining the first sound source pulse response as a pulse response of a preset sound source in front of the target sound field, and finally, determining a more accurate loudspeaker driving signal through an optimization function. Therefore, it is clear that the sound image position of the replay sound field is right ahead of the listener, and the listening comfort is improved.

Description

Technical Field

[0001] The present application belongs to the field of audio technology, and specifically relates to a method for controlling sound partitions in a space, an electronic device, a vehicle, and a medium. Background Art

[0002] With the development of intelligent audio systems, the demand for listening to different audio signals in different areas of the space without affecting each other is increasing, and the regional control technology of the sound field in the space has emerged.

[0003] In the prior art, acoustic contrast control (ACC) creates and optimizes the sound energy contrast between bright and dark areas to prevent the sound fields in the two areas from interfering with each other. The bright area is the area where the listener is expected to listen, and the dark area is the area where the listener is not expected to listen.

[0004] However, the existing technology does not provide a good listening experience. Summary of the Invention

[0005] The embodiments of the present application provide a method for controlling sound zones in a space to solve the problem of poor listening experience in the prior art.

[0006] A first aspect of an embodiment of the present application provides a method for controlling sound zones in a space, wherein the sound zones include a bright zone and a dark zone. The method includes:

[0007] Determining a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field;

[0008] The driving signal of each loudspeaker is determined based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

[0009] Optionally, determining the first sound source impulse response of the target sound field includes:

[0010] In a sound-cancelling environment, a first sound source impulse response of the target sound field is determined based on a white noise signal played by a target loudspeaker and a white noise signal received by a target microphone, wherein a relative position of the target loudspeaker and the target microphone satisfies a target relative position, and the target relative position is a relative position of the fitting sound source in the space and a playback area of the bright area.

[0011] Optionally, determining the first sound source impulse response of the target sound field based on the white noise signal played by the target loudspeaker and the white noise signal received by the target microphone includes:

[0012] based on determining a first sound source impulse response of the target sound field;

[0013] Among them, P desired (f) represents the first sound source impulse response, P0(f) represents the frequency domain representation of the self-noise signal played by the target speaker, and P1(f) represents the frequency domain representation of the white noise signal received by the target microphone.

[0014] Optionally, determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function includes:

[0015] based on determining a driving signal for each speaker;

[0016] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, It represents the square of the Euclidean norm of the vector, and a represents the parameter that adjusts the relative degree between the accuracy of the bright area sound field reproduction and the control of the dark area sound energy.

[0017] Optionally, determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function includes:

[0018] based on determining a driving signal for each speaker;

[0019] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, represents the square of the Euclidean norm of the vector, a represents the parameter for adjusting the relative degree between the accuracy of the bright area sound field reproduction and the dark area sound energy control, st represents the conditional constraint, β represents the speaker energy threshold, and Indicates the bright area error, Represents the dark area energy.

[0020] Optionally, also include:

[0021] Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a short pulse signal;

[0022] Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain;

[0023] Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained, and the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0024] Optionally, also include:

[0025] Inputting an input signal into the sound partition system in the space, measuring and recording a response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a white noise signal;

[0026] Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain;

[0027] Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0028] Optionally, also include:

[0029] Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a sine frequency sweep signal;

[0030] Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain;

[0031] Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0032] Optionally, also include:

[0033] Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a segmented excitation signal;

[0034] Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain;

[0035] Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0036] Optionally, also include:

[0037] Based on the least squares estimation method, the electroacoustic transfer function of the sound partition system in the space is obtained, and the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0038] Optionally, the electroacoustic transfer function includes:

[0039]

[0040] Among them, H m,l It represents the electroacoustic transfer function from the lth loudspeaker to the mth microphone in the frequency domain. The electroacoustic transfer function corresponding to the microphone array in the bright area is the electroacoustic transfer function of the bright area, and the electroacoustic transfer function corresponding to the microphone array in the dark area is the electroacoustic transfer function of the dark area.

[0041] A second aspect of an embodiment of the present application provides a device for controlling sound zones in a space, wherein the sound zones include a bright zone and a dark zone, and the device includes:

[0042] A first processing module is configured to determine a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field;

[0043] The second processing module is configured to determine a driving signal for each loudspeaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

[0044] Optionally, the first processing module is specifically used to determine the first sound source impulse response of the target sound field in a sound-proofing environment based on the white noise signal played by the target speaker and the white noise signal received by the target microphone, wherein the relative position of the target speaker and the target microphone satisfies a target relative position, and the target relative position is the relative position of the fitting sound source in the space and the playback area of the bright area.

[0045] Optionally, the first processing module is specifically configured to: determining a first sound source impulse response of the target sound field;

[0046] Among them, P desired (f) represents the first sound source impulse response, P0(f) represents the frequency domain representation of the self-noise signal played by the target speaker, and P1(f) represents the frequency domain representation of the white noise signal received by the target microphone.

[0047] Optionally, the second processing module is specifically configured to: determining a driving signal for each speaker;

[0048] Where w represents the speaker driving signal, Hb represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, It represents the square of the Euclidean norm of the vector, and a represents the parameter that adjusts the relative degree between the accuracy of the bright area sound field reproduction and the control of the dark area sound energy.

[0049] Optionally, the second processing module is specifically configured to: determining a driving signal for each speaker;

[0050] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, represents the square of the Euclidean norm of the vector, a represents the parameter for adjusting the relative degree between the accuracy of the bright area sound field reproduction and the dark area sound energy control, st represents the conditional constraint, β represents the speaker energy threshold, and Indicates the bright area error, Represents the dark area energy.

[0051] Optionally, the second processing module is also used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a short pulse signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space, where the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0052] Optionally, the second processing module is also used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a white noise signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0053] Optionally, the second processing module is also used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, wherein the input signal is a sinusoidal swept frequency signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0054] Optionally, the second processing module is also used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a segmented excitation signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0055] Optionally, the second processing module is further configured to obtain an electroacoustic transfer function of the sound partition system in the space based on a least squares estimation method, wherein the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0056] Optionally, the electroacoustic transfer function includes:

[0057]

[0058] Among them, H m,l It represents the electroacoustic transfer function from the lth loudspeaker to the mth microphone in the frequency domain. The electroacoustic transfer function corresponding to the microphone array in the bright area is the electroacoustic transfer function of the bright area, and the electroacoustic transfer function corresponding to the microphone array in the dark area is the electroacoustic transfer function of the dark area.

[0059] A third aspect of an embodiment of the present application provides a control system for sound zoning in a space, wherein the sound zoning includes a bright area and a dark area. The system includes a plurality of speakers and the control device as described in the second aspect above.

[0060] A fourth aspect of an embodiment of the present application provides an electronic device, comprising: a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the method for controlling sound zoning in a space described in the first aspect above are implemented.

[0061] A fifth aspect of an embodiment of the present application provides a vehicle, comprising: a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the method for controlling sound zoning within a space described in the first aspect above are implemented.

[0062] A sixth aspect of an embodiment of the present application provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method for controlling sound zoning in a space described in the first aspect are implemented.

[0063] A seventh aspect of an embodiment of the present application provides a computer program product, which, when executed by a processor of a vehicle or a cloud server, implements the steps of the method for controlling sound zoning within a space described in the first aspect above.

[0064] The control method, electronic device, vehicle, and medium for acoustic zoning within a space provided by the embodiments of the present application determine the first sound source impulse response of a target sound field, where the first sound source impulse response is the impulse response of a preset sound source directly in front of the target sound field. The drive signals for each speaker are determined based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and an optimization function. Specifically, by constraining the first sound source impulse response to be the impulse response of the preset sound source directly in front of the target sound field, a more accurate speaker drive signal is ultimately determined using the optimization function. This ensures that the sound image position of the reproduced sound field is directly in front of the listener, improving listening comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic diagram of a vehicle interior sound field partitioning scenario provided by an embodiment of the present application;

[0066] Figure 2 A flowchart of a method for controlling sound zoning in a space provided in an embodiment of the present application;

[0067] Figure 3 A flowchart of another method for controlling sound zoning in a space provided by an embodiment of the present application;

[0068] Figure 4 A flowchart of another method for controlling sound zoning in a space provided in an embodiment of the present application;

[0069] Figure 5 A flowchart of another method for controlling sound zoning in a space provided in an embodiment of the present application;

[0070] Figure 6 A flowchart of another method for controlling sound zoning in a space provided in an embodiment of the present application;

[0071] Figure 7 A flowchart of another method for controlling sound zoning in a space provided in an embodiment of the present application;

[0072] Figure 8 A flowchart of another method for controlling sound zoning in a space provided in an embodiment of the present application;

[0073] Figure 9 A schematic diagram of a process for determining an electroacoustic transfer function provided in an embodiment of the present application;

[0074] Figure 10 A schematic structural diagram of a device for controlling sound zones within a space provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0076] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0077] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0078] In the prior art, the ACC method measures the electroacoustic transfer function from the speaker array to the control points in the front and rear areas of the car respectively; then, based on the needs of the passengers, it defines the control scenario and constructs a control model in the frequency domain; the model is solved to finally obtain the speaker array excitation signal. However, the control model in the above technology aims to maximize the sound energy contrast between the bright and dark areas, focusing on the sound field performance, ignoring the integrity of the sound field, causing maximum distortion, and resulting in poor sound quality. The present application provides a control method for sound zoning in space, which calculates the driving signals of the speakers in the bright and dark areas by presetting a target sound field with the sound image directly in front of the listener, combining the sound pressure matching (PM) method and the ACC method, and at the same time limiting the amplitude threshold of the speaker driving signal, thereby achieving a low-distortion playback sound field, accurate sound image and balanced listening experience, thereby improving the listening comfort of the listener.

[0079] In the embodiments of the present application, the control of the playback of multiple sound field partitions in the space is achieved by clearly selecting the target sound field and combining the PM method and the ACC method. Among them, the PM method refers to the playback of the bright area sound field through a speaker array, specifically by minimizing the error between the sound pressure of the reproduced bright area sound field and the sound pressure of the target sound field, so as to achieve the sound pressure distribution of the reproduced bright area sound field as close to the target sound field as possible; the ACC method refers to maximizing the sound energy ratio of the bright area and the dark area, so as to increase the sound energy of the bright area sound field and reduce the sound energy of the dark area sound field. For the convenience of description, in the following embodiments of the present application, the impulse response of the target sound field simulated in the anechoic chamber is described as the first sound source impulse response, the loudspeaker used to simulate the target sound field in the anechoic chamber is described as the target loudspeaker, and the microphone used to simulate the target sound field in the anechoic chamber is described as the target microphone.

[0080] The method for controlling sound zoning in a space according to the embodiments of the present application can be applied to various spaces, for example, a car, a studio, etc. The following embodiments of the present application describe the technical solution using the car as an example.

[0081] Figure 1 A schematic diagram of a car interior sound field partitioning scenario provided by an embodiment of the present application, such as Figure 1 As shown in the figure, the interior of the car is divided into four playback sound field areas, namely the main driver's seat area, the co-driver's seat area, the left rear area and the right rear area. Speaker arrays are arranged on both sides of the car, and multiple sampling points set at the four sound field partitions are used as listening points to place microphone arrays to measure the electroacoustic transfer function of the speaker array.

[0082] Among them, in the playback of these four sound field partitions, different target sound fields are simulated for different areas according to the listener's needs, and a fixed sound source position is set for each target sound field. For example, for the main driving position area, the sound source position of the fitting target sound field is defined as 1m in front of the main driving position, and for the co-pilot position area, the sound source position of the fitting target sound field is defined as 1m in front of the co-pilot position. If the rear row in the car is a sound field area, the sound source position of the fitting target sound field is defined as 1m in front of the center position of the rear row; if the rear row is divided into two sound field areas: left rear sound field and right rear sound field, the sound source position of the fitting target sound field at the left rear sound field position is defined as the middle position of the rear row of the main driving seat, and the sound source position of the fitting target sound field at the right rear sound field position is defined as the middle position of the rear row of the co-pilot seat. The horizontal height of all target sound sources is the same as the horizontal plane of the human ears of the passengers.

[0083] The following describes the control method of sound zoning in the space of the application with several specific embodiments:

[0084] Figure 2 A flow chart of a method for controlling sound zones in a space provided in an embodiment of the present application, combined with Figure 1 and Figure 2 The process of the method of this embodiment is as follows:

[0085] S21: Determine a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field.

[0086] Among them, the preset sound source of the target sound field is located at a preset distance directly in front of the target sound field. By presetting the target sound field, the sound image position of the reproduced bright area sound field can be clearly located directly in front of the listener, ensuring that the time difference and sound pressure level difference from the target sound field to both ears are the same, and no biased sound field is generated, that is, the sound heard by the listener is expected to come from a fixed position. In order to simulate the sound source signal of the reproduced bright area sound field and to avoid false sounds, the preset sound source signal of the target sound field is simulated in an anechoic environment, and the impulse response of the preset sound source directly in front of the target sound field is determined to be the first sound source impulse response of the target sound field. The specific relative position of the preset sound source and the target sound field is determined according to the needs of actual applications, and the first sound source impulse response of the target sound field is matched and calculated according to the specific relative position of the preset sound source and the target sound field in actual applications.

[0087] Specifically, in an anechoic environment, for example, a loudspeaker is placed in an anechoic chamber to generate a white noise signal, which is played through the loudspeaker. The position of the microphone in the anechoic chamber is specified according to the target sound field to be simulated, for example, 1 meter in front of the loudspeaker, and the microphone is used to record the white noise signal emitted from the loudspeaker. The collected data of the white noise signal recorded by the microphone is analyzed using digital signal processing software to calculate the first sound source impulse response, which is actually solving the transfer function between the input signal and the output signal, expressed as P desired (f), where the input signal is the white noise signal played by the loudspeaker and the output signal is the white noise signal recorded by the microphone.

[0088] An anechoic chamber is a room specifically designed to minimize external noise interference. Its walls are covered with sound-absorbing material, significantly reducing reflections, making it suitable for conducting precise acoustic measurements. White noise is a noise signal that contains all frequency components, with a power spectral density that is evenly distributed across all frequencies. It is used as a test signal because it stimulates a speaker to respond across the entire frequency range. When playing a white noise signal through a speaker, ensure that the signal intensity is moderate—neither too weak nor too strong—to prevent speaker damage or microphone overload.

[0089] S22: Determine a driving signal for each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

[0090] In some embodiments, a control area within the vehicle is first defined based on in-vehicle requirements. A playback area is selected as the bright zone, while other areas are designated as dark zones. A bright zone indicates an increase in sound pressure after playback, while a dark zone indicates a decrease in sound pressure after playback. For example, if the driver in the driver's seat is expected to hear navigation audio, while people in other areas are not, the driver's seat is defined as the bright zone, while the passenger seat and rear seats are designated as dark zones. In this case, after playback, the sound pressure in the driver's seat will increase, while the sound pressure in the passenger seat and rear seats will decrease.

[0091] In other embodiments, a control area within the vehicle is first defined based on in-vehicle requirements. A portion of the playback area is then selected as the bright zone, while the remaining areas are designated as the dark zone. A bright zone indicates an increase in sound pressure after playback, while a dark zone indicates a decrease in sound pressure after playback. For example, if the driver in the driver's seat is intended to hear navigation audio while people in other areas are not, the area near the front window of the driver's seat is defined as the bright zone, while other areas, such as the passenger seat and rear seats, are designated as the dark zones. Consequently, after playback, the sound pressure in the driver's seat increases, while the sound pressure in the passenger seat and rear seats decreases.

[0092] Furthermore, by combining the ACC method and the PM method to construct an optimization function for multi-zone sound field zoning control, control of the speaker drive signals for the bright and dark sound fields is achieved. Specifically, the speaker drive signal is represented as a complex Fourier transform, which contains amplitude and phase information. The PM method controls the speaker drive signal in the bright zone, that is, controls the amplitude and phase of the reproduced sound field in the bright zone, thereby achieving precision control of the reproduced sound field in the bright zone. The ACC method controls the sound energy contrast between the bright and dark zones, that is, controls the contrast between the precision of the reproduced sound field in the bright zone and the sound energy of the reproduced sound field in the dark zone, thereby achieving balanced control of the precision and fidelity of the reproduced sound field in the bright zone.

[0093] Specifically, based on the electroacoustic transfer function of the bright area, the driving signal of the loudspeaker, and the first sound source impulse response, an optimization function that minimizes the error between the reproduced sound field in the bright area and the target sound field can be constructed; based on the optimization function that minimizes the error between the reproduced sound field in the bright area and the target sound field, the driving signal of the loudspeaker, and the electroacoustic transfer function of the dark area, an optimization function that adjusts the reproduction accuracy of the actual bright area sound field and the relative degree of sound energy in the dark area sound field can be constructed; based on the optimization function that minimizes the error between the reproduced sound field in the bright area and the target sound field and the optimization function that adjusts the reproduction accuracy of the actual bright area sound field and the relative degree of sound energy in the dark area sound field, an optimization function for multi-region sound field zoning control can be constructed; based on the optimization function, the driving signal of each loudspeaker can be obtained, and the optimization function can be expressed as:

[0094]

[0095] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, H b w represents the response of the loudspeaker in the bright area to the driving signal, that is, the reproduced bright area sound field, H d w represents the response of the loudspeaker in the dark area to the driving signal, that is, the reproduced dark area sound field, P desired Represents the first sound source impulse response, that is, the target sound field expected to be reproduced in the bright area, It represents the square of the Euclidean norm of a vector and is used to measure the magnitude of the error. a represents the parameter that adjusts the relative degree between the accuracy of the bright area sound field reproduction and the control of the dark area sound energy.

[0096] From the above optimization function, we can see that Refers to the electroacoustic transfer function H based on the bright area b and the target sound field P of the expected bright area playback desired , compare the actual reproduced bright area sound field with the target sound field, and minimize their error to obtain the speaker driving signal w, so that the sound pressure distribution of the reproduced bright area sound field is as close as possible to the preset target sound field. Refers to the electroacoustic transfer function H based on the dark area d Minimize the dark area sound field and obtain the speaker driving signal w to minimize the sound energy of the dark area sound field. This refers to adjusting the playback accuracy of the actual bright area sound field and the relative degree of acoustic energy in the dark area sound field in combination with parameter a to achieve control of the acoustic energy contrast between the bright and dark areas. That is, the range of a is 0 to 1. The value of a reflects the importance of the reconstruction quality of the bright area sound field in the optimization process, and the value of (1-a) reflects the importance of dark area acoustic energy control in the optimization process, that is, the importance of controlling the acoustic energy difference between the bright and dark area sound fields. By adjusting the parameter a to the most appropriate size, a balanced control is achieved. While controlling the acoustic energy contrast between the bright and dark area sound fields, the reconstruction quality of the bright area sound field can also be emphasized. In other words, it is hoped that the acoustic energy in the bright area will be increased without distortion.

[0097] If the speaker drive signal is too large, it will not only exceed the dynamic range of the speaker playback, resulting in nonlinear distortion, but also cause the sound field to produce sound image bias, affecting the listening experience. Therefore, by considering the amplitude limit of the speaker drive signal, the optimization function can also be expressed as:

[0098]

[0099] Among them, st represents the conditional constraint, and β represents the speaker energy threshold. Specifically, This refers to the constraint on the speaker drive signal, used to limit the amplitude of the speaker drive signal. The value of parameter β can be determined by speaker specifications and actual verification. Possible methods for determining the speaker energy threshold include but are not limited to the following two:

[0100] One possible method for determining a speaker's energy threshold is based on its specifications. Each speaker has its own specifications, with the frequency response describing the frequency range it can effectively reproduce. This range is typically given as the lowest to highest frequency, such as 80 Hz to 20 kHz. The speaker's energy threshold can be determined based on this highest frequency.

[0101] Another possible method for determining the speaker energy threshold is based on human listening. If the speaker drive signal is too high, the sound signal played by the speaker will produce additional harmonics, which will change the timbre of the sound, making it sound impure, unnatural, or even harsh to the human ear. Human listening can be used to select the most comfortable speaker drive signal to determine the speaker energy threshold.

[0102] This embodiment determines the first sound source impulse response of the target sound field. This first sound source impulse response is the impulse response of a preset sound source directly in front of the target sound field. The drive signals for each speaker are determined based on the electroacoustic transfer function (EATF) of the bright area, the first sound source impulse response, the EATF of the dark area, and an optimization function. In other words, by constraining the first sound source impulse response to be the impulse response of the preset sound source directly in front of the target sound field, more accurate speaker drive signals are ultimately determined using the optimization function. This ensures that the sound image of the reproduced sound field is directly in front of the listener, improving listening comfort.

[0103] Figure 3 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 3 As shown, Figure 3 is Figure 2 Based on this, a possible implementation of S21 is further described:

[0104] S211: In a sound-cancelling environment, determining a first sound source impulse response of the target sound field based on a white noise signal played by a target loudspeaker and a white noise signal received by a target microphone, wherein a relative position of the target loudspeaker and the target microphone satisfies a target relative position, and the target relative position is a relative position of the fitting sound source in the space and a playback area of the bright area.

[0105] Optionally, the target sound field is simulated in an anechoic chamber to determine the first sound source impulse response, the target speaker is a speaker placed in the anechoic chamber, the target microphone is a microphone placed in the anechoic chamber, and the fitting sound source is a sound source of a preset sound source corresponding to the target sound field fitted in the playback area. In the anechoic chamber, the placement of the speaker and the microphone should be the same as the placement of the fitting sound source and the playback area in the actual space.

[0106] For example, possible implementations of simulating a target sound field in an anechoic chamber include, but are not limited to, the following:

[0107] One possible implementation is: Figure 1 As shown, assuming that the main driving seat area is a bright area, the fitting sound source position of the main driving seat area is set to a place 1m in front of the main driving seat and at the same height as the human ear. When simulating the target sound field of the main driving seat area in the anechoic chamber, the position of the target microphone is set to a place 1m in front of the target speaker position and at the same height as the human ear.

[0108] Another possible implementation is: Figure 1As shown, assuming that the rear area is a bright area, the fitting sound source position of the rear area is set to a place 1m in front of the center of the rear area and at the same height as the human ear. When simulating the target sound field of the rear area in the anechoic chamber, the position of the target microphone is set to a place 1m in front of the target speaker position and at the same height as the human ear.

[0109] Another possible implementation is: Figure 1 As shown, assuming that the right side of the rear row is a bright area, the fitting sound source position of the right side of the rear row is set to the middle of the rear row of the main driver's seat at the same height as the human ear. When simulating the target sound field of the right side of the rear row in the anechoic chamber, the position of the target microphone is set to a place that is directly in front of the target speaker position and at the same distance from the middle of the rear row of the main driver's seat to the person and at the same height as the human ear.

[0110] Among them, the entire path from the target loudspeaker playing the white noise signal to the target microphone receiving the white noise signal is used as the simulated target sound field and can be regarded as a system. The input signal of the system is the white noise signal p0 played by the loudspeaker, and the output signal is the white noise signal p1 recorded by the microphone. Through the frequency domain representation of the white noise signal played by the target loudspeaker and the frequency domain representation of the white noise signal received by the target microphone, the impulse response of the target sound field in the frequency domain can be obtained, that is, the first sound source impulse response of the target sound field.

[0111] The impulse response is the response of a system to a unit impulse function δ(t). For any input signal, the output of the system can be calculated by convolving the input signal with the system impulse response:

[0112] y(t)=x(t)*h(t)

[0113] Where h(t) represents the system impulse response, * represents the convolution operation, x(t) represents the input signal, and y(t) represents the output signal. If the input and output signals are known, the impulse response can be estimated by deconvolution:

[0114]

[0115] Among them, the impulse response h(t) is in the time domain. In order to analyze the frequency characteristics of the signal, it is necessary to convert the input signal and the output signal into the frequency domain by Fourier transform. The impulse response in the frequency domain can be expressed as:

[0116]

[0117] Where H(f) represents the impulse response of the system in the frequency domain, f represents the frequency of the signal, X(f) represents the frequency domain representation of the input signal, that is, the amplitude of the input signal at frequency f, and Y(f) represents the frequency domain representation of the output signal, that is, the amplitude of the output signal at frequency f.

[0118] Furthermore, by calculating the impulse response of the target sound field, we can learn important information about the frequency response and phase characteristics of the target sound field. By analyzing the impulse response of the target sound field, we can understand the behavior of the speaker in the entire frequency range, including its frequency response curve, phase delay characteristics, and whether there is distortion. Therefore, the white noise signal played by the target speaker and the white noise signal received by the microphone are converted to the frequency domain by Fourier transform to obtain the frequency domain representation of the white noise signal played by the speaker and the frequency domain representation of the white noise signal recorded by the microphone. Then, based on the frequency domain representation of the white noise signal played by the speaker and the frequency domain representation of the white noise signal recorded by the microphone, the impulse response of the target sound field in the frequency domain can be obtained. In the frequency domain, the first sound source impulse response of the target sound field can be expressed as:

[0119]

[0120] Among them, P desired (f) represents the impulse response of the first sound source, reflecting the frequency response characteristics of the sound transmission process from the speaker to the microphone position; f represents the frequency of the white noise signal, P0(f) represents the frequency domain representation of the self-noise signal played by the target speaker, that is, the amplitude of the self-noise signal played by the target speaker at frequency f; P1(f) represents the frequency domain representation of the white noise signal received by the target microphone, which is also the amplitude of the white noise signal received by the target microphone at frequency f. In the frequency domain, convolution operations become point multiplication operations, and deconvolution operations become division operations. Therefore, the impulse response of the target sound field is the ratio of the frequency domain representation of the self-noise signal played by the speaker to the frequency domain representation of the white noise signal recorded by the microphone.

[0121] In this embodiment, a first sound source impulse response of the target sound field is determined based on a white noise signal played by a target speaker and a white noise signal received by a target microphone. The relative positions of the target speaker and the target microphone satisfy a target relative position, which is the relative position of the fitted sound source and the playback area in space. Thus, the frequency response of the target sound field is determined.

[0122] Figure 4 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 4 As shown, Figure 4 is Figure 2Based on the above, before S22, a possible implementation method for determining the electroacoustic transfer function is described. The method of this embodiment is as follows:

[0123] S41: inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a short pulse signal.

[0124] The entire path from the sound signal played by the car's speaker array to the sound signal received by the microphone array in the playback area is the playback sound field, which can be regarded as a spatial sound partitioning system. The input signal of this system is the sound signal played by the speaker array, and the output signal is the sound signal recorded by the microphone. One possible choice for the input signal is a short pulse signal. The characteristic of a pulse signal is that it has high energy in a short period of time, which is suitable for stimulating the system's response. The input signal is represented by x δ (t), the output signal is expressed as y δ (t).

[0125] S42: Perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain.

[0126] In order to analyze the frequency response characteristics, the input pulse signal x δ (t) is Fourier transformed to obtain its frequency domain representation:

[0127]

[0128] Among them, X δ (f) represents the frequency domain representation of the input pulse signal, x δ (t) represents the input pulse signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0129] Furthermore, the output pulse signal y δ (t) is also Fourier transformed to obtain its frequency domain representation:

[0130]

[0131] Among them, Y δ (f) represents the frequency domain representation of the output pulse signal, y δ (t) represents the output pulse signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0132] S43: Based on the relationship between the input signal and the output signal represented in the frequency domain, obtaining the electroacoustic transfer function of the sound partition system in the space, the electroacoustic transfer function including: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0133] Among them, the electroacoustic transfer function refers to the path between the speaker and the microphone in the playback sound field area, which describes the relationship between the speaker input electrical signal and the sound signal detected by the microphone. It can reflect the frequency response characteristics of the sound transmission process from the speaker to the listener's ear in the car, and is used to understand and optimize the acoustic characteristics of the playback sound field area in the car.

[0134] Specifically, the relationship between the input pulse signal, the output pulse signal, and the electroacoustic transfer function represented in the frequency domain is as follows: the electroacoustic transfer function is defined as the ratio of the output signal represented in the frequency domain to the input signal represented in the frequency domain, and is expressed as:

[0135]

[0136] Among them, H δ (f) represents the frequency domain representation of the electroacoustic transfer function when the input signal is a pulse signal, X δ (f) represents the frequency domain representation of the input pulse signal, Y δ (f) shows the frequency domain representation of the output pulse signal.

[0137] Furthermore, the microphone array arranged in the bright area measures the pulse signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the bright area, which is recorded as The microphone array arranged in the dark area measures the pulse signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the dark area, which is recorded as

[0138] In this embodiment, an input signal is input into a spatial sound partition system, and the response of the spatial sound partition system to the input signal is measured and recorded to obtain an output signal. The input signal is a pulse signal. The input signal and the output signal are Fourier transformed to obtain the input signal and the output signal in the frequency domain. Based on the relationship between the input signal and the output signal in the frequency domain, the electroacoustic transfer function of the spatial sound partition system is obtained. The electroacoustic transfer function includes the electroacoustic transfer function of the bright zone and the electroacoustic transfer function of the dark zone. Thus, the electroacoustic transfer function can be accurately calculated, and the frequency characteristics of the reproduced sound field can be quickly obtained.

[0139] Figure 5 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 5 As shown, Figure 5 is Figure 2 On the basis of the above, before S22, another possible implementation method for determining the electroacoustic transfer function is described. The method of this embodiment is as follows:

[0140] S51: inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a white noise signal.

[0141] Another possible choice of input signal is white noise signal. The characteristic of white noise signal is that it has a flat spectrum and can evenly excite the various frequency components of the system. The input signal of the sound partition system in the space is expressed as x p (t), the output signal is expressed as y p (t).

[0142] S52: Perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain.

[0143] In order to analyze the frequency response characteristics, the input white noise signal x p (t) is Fourier transformed to obtain its frequency domain representation:

[0144]

[0145] Among them, X p (f) represents the frequency domain representation of the input white noise signal, x p (t) represents the input white noise signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0146] Furthermore, the output white noise signal y p (t) is also Fourier transformed to obtain its frequency domain representation:

[0147]

[0148] Among them, Y p (f) represents the frequency domain representation of the output white noise signal, y p (t) represents the output white noise signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0149] S53: Based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0150] Specifically, the relationship between the input white noise signal, the output white noise signal, and the electroacoustic transfer function represented in the frequency domain is as follows: the electroacoustic transfer function is defined as the ratio of the output signal represented in the frequency domain to the input signal represented in the frequency domain, and is expressed as:

[0151]

[0152] Among them, H p (f) represents the frequency domain representation of the electroacoustic transfer function when the input signal is a white noise signal, X p (f) represents the frequency domain representation of the input white noise signal, Y p (f) shows the frequency domain representation of the output white noise signal.

[0153] Furthermore, the microphone array arranged in the bright area measures the white noise signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the bright area, which is recorded as The microphone array arranged in the dark area measures the white noise signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the dark area, which is recorded as

[0154] In this embodiment, an input signal is input into a spatial sound partition system, and the response of the spatial sound partition system to the input signal is measured and recorded to obtain an output signal. The input signal is a white noise signal. The input signal and the output signal are Fourier transformed to obtain the input signal and the output signal in the frequency domain. Based on the relationship between the input signal and the output signal in the frequency domain, the electroacoustic transfer function of the spatial sound partition system is obtained. The electroacoustic transfer function includes the electroacoustic transfer function of the bright zone and the electroacoustic transfer function of the dark zone. Thus, the electroacoustic transfer function can be accurately calculated, and the comprehensive frequency characteristics of the reproduced sound field can be accurately obtained.

[0155] Figure 6 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 6 As shown, Figure 6 is Figure 2 On the basis of the above, before S22, another possible implementation method for determining the electroacoustic transfer function is described. The method of this embodiment is as follows:

[0156] S61: Input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, wherein the input signal is a sine frequency sweep signal.

[0157] Among them, another input signal can be selected as a sine sweep signal. Using a sine wave signal with gradually changing frequency as input can cover the entire frequency band of interest and can more accurately obtain the system characteristics from low frequency to high frequency. The input signal of the sound partition system in the space is expressed as x s (t), the output signal is expressed as y s (t).

[0158] S62: Perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain.

[0159] In order to analyze the frequency response characteristics, the input sinusoidal sweep signal x s (t) is Fourier transformed to obtain its frequency domain representation:

[0160]

[0161] Among them, X s (f) represents the frequency domain representation of the input sine sweep signal, x s (t) represents the input sine sweep signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0162] Furthermore, the output sine frequency sweep signal y s (t) is also Fourier transformed to obtain its frequency domain representation:

[0163]

[0164] Among them, Y s (f) represents the frequency domain representation of the output sine sweep signal, y s (t) represents the output sine sweep signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0165] S63: Based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0166] Specifically, the relationship between the input sine swept signal, the output sine swept signal, and the electroacoustic transfer function represented in the frequency domain is as follows: The electroacoustic transfer function is defined as the ratio of the output signal represented in the frequency domain to the input signal represented in the frequency domain, and is expressed as:

[0167]

[0168] Among them, H s (f) represents the frequency domain representation of the electroacoustic transfer function when the input signal is a sinusoidal swept frequency signal, X s (f) represents the frequency domain representation of the input sine sweep signal, Y s (f) shows the frequency domain representation of the output sine sweep signal.

[0169] Furthermore, the microphone array arranged in the bright area measures the sine sweep signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the bright area, which is recorded as The microphone array arranged in the dark area measures the sine sweep signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the dark area, which is recorded as

[0170] In this embodiment, an input signal is input into a spatial sound partition system, and the response of the spatial sound partition system to the input signal is measured and recorded to obtain an output signal. The input signal is a swept sinusoidal signal. The input signal and the output signal are Fourier transformed to obtain frequency-domain representations of the input signal and the output signal. Based on the relationship between the frequency-domain representations of the input signal and the output signal, the electroacoustic transfer function of the spatial sound partition system is obtained. The electroacoustic transfer function includes the electroacoustic transfer function of the bright zone and the electroacoustic transfer function of the dark zone. Thus, the electroacoustic transfer function can be accurately calculated, and the frequency response characteristics of the reproduced sound field from low to high frequencies can be accurately obtained.

[0171] Figure 7 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 7 As shown, Figure 7 is Figure 2 On the basis of the above, before S22, another possible implementation method for determining the electroacoustic transfer function is described. The method of this embodiment is as follows:

[0172] S71: Input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a segmented excitation signal.

[0173] Among them, another option for the input signal is a segmented excitation signal. By inputting signals of different frequencies in segments, the transfer function of the system is measured. These signals can be narrowband signals or broadband signals covering multiple frequency bands. Narrowband signals help to accurately measure the response of the system near a specific frequency, while multi-band excitation can quickly obtain the approximate characteristics of the system in the entire frequency domain. Taking the segmented excitation signal as an example, the input signal of the sound partition system in the space is expressed as x f (t), the output signal is expressed as y f (t).

[0174] S72: Perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain.

[0175] In order to analyze the frequency response characteristics, the input segmented excitation signal x f (t) is Fourier transformed to obtain its frequency domain representation:

[0176]

[0177] Among them, X f (f) represents the frequency domain representation of the input segmented excitation signal, x f (t) represents the input segmented excitation signal, e -j2πft is a complex exponential function used to convert a time domain signal into a frequency domain signal, where j is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0178] Furthermore, the output segmented excitation signal y f (t) is also Fourier transformed to obtain its frequency domain representation:

[0179]

[0180] Among them, Y f (f) represents the frequency domain representation of the output segmented excitation signal, y f (t) represents the output segmented excitation signal, e -j2πft It is a complex exponential function used to convert a time domain signal into a frequency domain signal, where h is the imaginary unit, f is the frequency variable, and -2πft represents the angular frequency.

[0181] S73: Based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0182] Specifically, the relationship between the input segmented excitation signal, the output segmented excitation signal, and the electroacoustic transfer function represented in the frequency domain is as follows: The electroacoustic transfer function is defined as the ratio of the output signal represented in the frequency domain to the input signal represented in the frequency domain, and is expressed as:

[0183]

[0184] Among them, H f (f) represents the frequency domain representation of the electroacoustic transfer function when the input signal is a segmented excitation signal, X f (f) represents the frequency domain representation of the input segmented excitation signal, Y f (f) shows the frequency domain representation of the output segmented excitation signal.

[0185] Furthermore, the microphone array arranged in the bright area measures the segmented excitation signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the bright area, which is recorded as The microphone array arranged in the dark area measures the segmented excitation signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the dark area, which is recorded as

[0186] In this embodiment, an input signal is input into a spatial sound partition system, and the response of the spatial sound partition system to the input signal is measured and recorded to obtain output signals. The input signal is a segmented excitation signal. The input signal and the output signal are Fourier transformed to obtain input and output signals represented in the frequency domain. Based on the relationship between the input and output signals represented in the frequency domain, the electroacoustic transfer function of the spatial sound partition system is obtained. The electroacoustic transfer function includes the electroacoustic transfer function of the bright zone and the electroacoustic transfer function of the dark zone. Thus, the electroacoustic transfer function can be accurately calculated, and the general characteristics of the reproduced sound field across the entire frequency domain can be quickly obtained.

[0187] Figure 8 A flow chart of another method for controlling sound partitions in a space provided in an embodiment of the present application is shown as follows: Figure 8 As shown, Figure 8 is Figure 2 On the basis of the above, before S22, another possible implementation method for determining the electroacoustic transfer function is described. The method of this embodiment is as follows:

[0188] S81: Based on the least squares estimation method, obtain the electroacoustic transfer function of the sound partition system in the space, where the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0189] The core idea of the least squares estimation method is to minimize the sum of squares of the differences between the observed values and the model predicted values. That is, assuming there is a linear model y=Xβ+□, where y represents the observed value, which is an n×1 vector; X represents the feature matrix, which is an n×p matrix containing p eigenvalues of n observation samples; β is a p×1 vector containing p unknown parameters; □ represents the random error term, which is an n×1 vector, assuming that its mean is zero and the variance is the same; the goal of the least squares estimation is to find a parameter vector Make the residual sum of squares S(β)=(y-Xβ) T (y-Xβ) reaches its minimum.

[0190] Optionally, in an embodiment of the present application, a linear model is established for the playback sound field, the sound data played by the speaker array is used as the input signal, and the sound data collected by the microphone array is used as the output signal, and the electroacoustic transfer function from each speaker to each microphone is obtained, which is expressed as:

[0191]

[0192] Among them, h m,l represents the electroacoustic transfer function from the lth loudspeaker to the mth microphone in the time domain, where m = 1, 2, ..., M, l = 1, 2, ..., L, M is the number of microphones, and L is the number of loudspeakers; x l represents the white noise signal played by the lth speaker; y m,l represents the white noise signal collected by the mth microphone from the lth speaker, h m,l is the electroacoustic transfer function matrix to be estimated. In order to find the true electroacoustic transfer function, the least squares estimation method is used to find the matrix that makes ||y m,l -h m,l x l || 2 The smallest h m,L In order to analyze the frequency response characteristics of the reproduced sound field, it is necessary to transform the electroacoustic transfer function of the reproduced sound field into the frequency domain. The electroacoustic transfer function matrix in the frequency domain can be expressed as:

[0193]

[0194] Among them, H m,l The electroacoustic transfer function from the lth loudspeaker to the mth microphone in the frequency domain is the electroacoustic transfer function h m,l Obtained by Fast Fourier Transform (FFT).

[0195] The microphone array arranged in the bright area measures the sound signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the bright area, which is recorded as H b The microphone array arranged in the dark area measures the sound signal played by the speaker array to obtain the electroacoustic transfer function from the speaker to the control point in the dark area, which is recorded as H d .

[0196] In this embodiment, the electroacoustic transfer function of the sound partition system in the space is obtained by the least squares estimation method, thereby accurately calculating the electroacoustic transfer function and obtaining the frequency response characteristics of the reproduced sound field.

[0197] In the above embodiment, optionally, Figure 9 As shown, Figure 9 This is a flow chart of determining the electroacoustic transfer function provided in an embodiment of the present application, which optimizes the sound transmission effect by measuring and analyzing the response of the speaker array at different frequencies. Specifically, for example, using Figure 1 The speaker array shown plays white noise in four sound field partitions. First, a white noise signal is generated and sent to the speaker array. Each speaker plays white noise. At this time, the speaker does not add any filters and outputs the speaker excitation sound, which propagates in the space to form a playback sound field. Then, each microphone captures and records the sound signal from each speaker. These sound signals contain the original white noise signal emitted by the speaker and any changes caused by the environment. By analyzing the data collected by the microphone array, the electroacoustic transfer function from each speaker to each microphone is obtained. Finally, the electroacoustic transfer function is converted to the frequency domain through fast Fourier transform.

[0198] In the above embodiments, the division method of bright areas and dark areas can be preset before leaving the factory, or it can be dynamically determined during the use of the vehicle according to the actual application scenario. For example, one possible implementation method is to determine the areas corresponding to bright areas and dark areas based on the type of audio stream. For example, if the type of audio stream is music, the front area can be determined as the dark area, and the rear area can be determined as the bright area; for another example, if the type of audio stream is a navigation signal, the area of the driving seat can be determined as the bright area, and other areas can be determined as the dark area. The specific method of dividing bright areas and dark areas can be flexibly set based on the actual application scenario, and the embodiments of the present application do not limit this.

[0199] The following describes the optimization process of acoustic zoning control with several specific examples:

[0200] One possible situation is: Figure 1As shown, assuming that a speaker array is used to play the navigation voice, if you want the driver in the main driving seat to hear the navigation voice and the sound comes from directly in front of the driver, but do not want people in other areas to hear it, the main driving seat is defined as the bright area, and the co-pilot seat and the back area are dark areas. The fitting sound source position set in the main driving area is 1m directly in front of the driver. By placing a target microphone in an anechoic chamber at 1m in front of a target speaker at the same height as the human ear, the impulse response of the target sound source signal is simulated to obtain the target sound field of the main driving area, and by measuring the electroacoustic transfer function from the speaker array to the main driving area, the playback sound field of the main driving seat is obtained; by measuring the electroacoustic transfer function from the speaker array to other areas, the playback sound fields of other areas are obtained; by minimizing the error between the playback sound field of the main driving area and the target sound field, minimizing the playback sound fields of other areas, and optimizing the accuracy of the playback sound field of the main driving area and the relative degree of sound energy of the playback sound fields of other areas, the speaker driving signal in the main driving area is maximized, while the speaker driving signals in other areas are minimized, thereby maximizing the sound energy in the playback sound field of the main driving area and minimizing the sound energy in the playback sound field of other areas; by limiting the speaker driving signal in the main driving area, the driver can finally hear a comfortable and balanced navigation voice, and its sound image is located directly in front of the driver.

[0201] Another possible situation is: Figure 1 As shown, assuming that a speaker array is used to play radio music, if you want the rear passengers to hear the radio music and the sound comes from directly in front of the passengers, but you do not want the people in the driver's seat and the co-pilot seat to hear it, then the rear area is defined as a bright area, the driver's seat and the co-pilot seat are defined as dark areas, and the fitting sound source position set in the rear area is 1m directly in front of the center of the rear row. By placing a target microphone in an anechoic chamber at 1m in front of a target speaker at the same height as the human ear to simulate the impulse response of the target sound source signal, the target sound field in the rear area is obtained, and by measuring the electroacoustic transfer function from the speaker array to the rear area, the reproduced sound field in the rear area is obtained; by measuring the electroacoustic transfer function from the speaker array to the driver's seat and the co-driver's seat, the reproduced sound field in the front area is obtained; by minimizing the error between the reproduced sound field and the target sound field in the rear area, minimizing the reproduced sound field in the front area, and optimizing the accuracy of the reproduced sound field in the rear area and the relative degree of sound energy in the reproduced sound field in the front area, the speaker driving signal in the rear area is maximized, while the speaker driving signal in the front area is minimized, thereby maximizing the sound energy in the reproduced sound field in the rear area and minimizing the sound energy in the reproduced sound field in the front area; by limiting the speaker driving signal in the rear area, the rear passengers can finally hear comfortable and balanced radio music, and their sound image is located directly in front of the center of the rear row.

[0202] Another possible situation is: Figure 1As shown, assuming that a speaker array is used to play hands-free calls, if you want the person in the right rear area to use the Bluetooth function for hands-free calls, and the sound comes from directly in front of the passenger without affecting people in other areas, the right rear area is defined as a bright area, and other areas are defined as dark areas. The fitting sound source position set in the right rear area is located in the middle position behind the main driver's seat. By placing a target microphone in an anechoic chamber directly in front of a target speaker and at the same distance between the main driver's seat and the passenger and at the same height as the human ear, the impulse response of the target sound source signal is simulated to obtain the target sound field of the right rear area, and by measuring the electroacoustic transfer function from the speaker array to the right rear area, the reproduced sound field of the right rear area is obtained; by measuring the electroacoustic transfer function from the speaker array to other areas, the reproduced sound fields of other areas are obtained; by minimizing the error between the reproduced sound field of the right rear area and the target sound field, minimizing the reproduced sound fields of other areas, and optimizing the accuracy of the reproduced sound field of the right rear area and the relative degree of sound energy of the reproduced sound fields of other areas, the speaker driving signal of the right rear area is maximized, while the speaker driving signal of other areas is minimized, thereby maximizing the sound energy in the reproduced sound field of the right rear area and minimizing the sound energy of the reproduced sound field of other areas; by limiting the speaker driving signal of the right rear area, the right rear passenger can finally hear comfortable and balanced hands-free phone sound, and its sound image is located in the middle position behind the main driver's seat.

[0203] In the above embodiment, the electroacoustic transfer function and the first sound source impulse response are obtained before the vehicle leaves the factory and are preset in the vehicle. Specifically, in actual application, the first sound source impulse response that matches the target sound field can be directly obtained based on the specific location of the target sound field.

[0204] Figure 10 A schematic diagram of the structure of a vehicle control device provided in an embodiment of the present application is shown in FIG. Figure 10 As shown, the sound partition includes: a bright area and a dark area, and the sound partition includes: a bright area and a dark area. The device includes: a first processing module 1001 and a second processing module 1002, wherein the first processing module 1001 is used to determine a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field;

[0205] The second processing module 1002 is configured to determine a driving signal for each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

[0206] Optionally, the first processing module 1001 is specifically used to determine the first sound source impulse response of the target sound field in a sound-proofing environment based on the white noise signal played by the target speaker and the white noise signal received by the target microphone, wherein the relative position of the target speaker and the target microphone satisfies a target relative position, and the target relative position is the relative position of the fitting sound source in the space and the playback area of the bright area.

[0207] Optionally, the first processing module 1001 is specifically configured to: determining a first sound source impulse response of the target sound field;

[0208] Among them, P desired (f) represents the first sound source impulse response, P0(f) represents the frequency domain representation of the self-noise signal played by the target speaker, and P1(f) represents the frequency domain representation of the white noise signal received by the target microphone.

[0209] Optionally, the second processing module 1002 is specifically configured to: determining a driving signal for each speaker;

[0210] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, It represents the square of the Euclidean norm of the vector, and a represents the parameter that adjusts the relative degree between the accuracy of the bright area sound field reproduction and the control of the dark area sound energy.

[0211] Optionally, the second processing module 1002 is specifically configured to: determining a driving signal for each speaker;

[0212] Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, represents the square of the Euclidean norm of the vector, a represents the parameter for adjusting the relative degree between the accuracy of the bright area sound field reproduction and the dark area sound energy control, st represents the conditional constraint, β represents the speaker energy threshold, and Indicates the bright area error, Represents the dark area energy.

[0213] Optionally, the second processing module 1002 is further used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a short pulse signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; and obtain the electroacoustic transfer function of the sound partition system in the space based on the relationship between the input signal and the output signal represented in the frequency domain, where the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0214] Optionally, the second processing module 1002 is further used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a white noise signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0215] Optionally, the second processing module 1002 is further used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a sinusoidal swept frequency signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0216] Optionally, the second processing module 1002 is further used to input an input signal into the sound partition system in the space, measure and record the response of the sound partition system in the space to the input signal, and obtain an output signal, where the input signal is a segmented excitation signal; perform Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; based on the relationship between the input signal and the output signal represented in the frequency domain, obtain the electroacoustic transfer function of the sound partition system in the space; the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

[0217] Optionally, the second processing module 1002 is further configured to obtain an electroacoustic transfer function of the sound partition system in the space based on a least squares estimation method, where the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

[0218] Optionally, the electroacoustic transfer function includes:

[0219]

[0220] Among them, H m,l It represents the electroacoustic transfer function from the lth loudspeaker to the mth microphone in the frequency domain. The electroacoustic transfer function corresponding to the microphone array in the bright area is the electroacoustic transfer function of the bright area, and the electroacoustic transfer function corresponding to the microphone array in the dark area is the electroacoustic transfer function of the dark area.

[0221] The device of this embodiment can be used to execute the technical solutions of the above-mentioned method embodiments accordingly. Its implementation principles and technical effects are similar and will not be described in detail here.

[0222] An embodiment of the present application further provides a control system for sound zoning in a space, wherein the sound zoning includes a bright area and a dark area, and the system includes a plurality of speakers and the control device as described above.

[0223] An embodiment of the present application also provides an electronic device, comprising: a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of any of the above-mentioned embodiments of the method for controlling sound zoning in a space are implemented.

[0224] An embodiment of the present application also provides a vehicle, comprising: a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of any of the above-mentioned embodiments of the method for controlling sound zoning in a space are implemented.

[0225] An embodiment of the present application further provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of any of the above-mentioned embodiments of the method for controlling sound zoning in a space are implemented.

[0226] An embodiment of the present application also provides a computer program product, which, when executed by a processor of a vehicle or a cloud server, implements the steps of any of the above-mentioned embodiments of the method for controlling sound zoning in a space.

[0227] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0228] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0229] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A method for controlling sound zones in a space, characterized in that: The sound zones include a bright zone and a dark zone, and the method includes: Determining a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field; The driving signal of each loudspeaker is determined based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

2. The method according to claim 1, characterized in that The determining of the first sound source impulse response of the target sound field includes: In a sound-cancelling environment, a first sound source impulse response of the target sound field is determined based on a white noise signal played by a target loudspeaker and a white noise signal received by a target microphone, wherein a relative position of the target loudspeaker and the target microphone satisfies a target relative position, which is a relative position of a fitting sound source and a playback area of a bright area in the space.

3. The method according to claim 2, characterized in that The determining of a first sound source impulse response of the target sound field based on a white noise signal played by a target loudspeaker and a white noise signal received by a target microphone includes: based on determining a first sound source impulse response of the target sound field; Among them, P desired (f) represents the first sound source impulse response, P0(f) represents the frequency domain representation of the white noise signal played by the target loudspeaker, and P1(f) represents the frequency domain representation of the white noise signal received by the target microphone.

4. The method according to any one of claims 1 to 3, characterized in that The determining of the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function includes: based on determining a driving signal for each speaker; Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, represents the square of the Euclidean norm of the vector, a represents the parameter for adjusting the relative degree between the accuracy of the bright area sound field reproduction and the control of the dark area sound energy, and Indicates the bright area error, Represents the dark area energy.

5. The method according to any one of claims 1 to 3, characterized in that The determining of the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function includes: based on determining a driving signal for each speaker; Where w represents the speaker driving signal, H b represents the electroacoustic transfer function in the bright zone, H d represents the electroacoustic transfer function of the dark zone, P desired represents the impulse response of the first sound source, represents the square of the Euclidean norm of the vector, a represents the parameter for adjusting the relative degree between the accuracy of the bright area sound field reproduction and the dark area sound energy control, st represents the conditional constraint, β represents the speaker energy threshold, and Indicates the bright area error, Represents the dark area energy.

6. The method according to claim 1, characterized in that Before determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function, the method further includes: Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a short pulse signal; Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained, and the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

7. The method according to claim 1, characterized in that Before determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function, the method further includes: Inputting an input signal into the sound partition system in the space, measuring and recording a response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a white noise signal; Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

8. The method according to claim 1, characterized in that Before determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function, the method further includes: Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a sine frequency sweep signal; Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

9. The method according to claim 1, characterized in that Before determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function, the method further includes: Inputting an input signal into the sound partition system in the space, measuring and recording the response of the sound partition system in the space to the input signal, and obtaining an output signal, wherein the input signal is a segmented excitation signal; Performing Fourier transform on the input signal and the output signal to obtain the input signal and the output signal represented in the frequency domain; Based on the relationship between the input signal and the output signal represented in the frequency domain, an electroacoustic transfer function of the sound partition system in the space is obtained; the electroacoustic transfer function includes: an electroacoustic transfer function of the bright area and an electroacoustic transfer function of the dark area.

10. The method according to claim 1, characterized in that Before determining the driving signal of each speaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function, the method further includes: Based on the least squares estimation method, the electroacoustic transfer function of the sound partition system in the space is obtained, and the electroacoustic transfer function includes: the electroacoustic transfer function of the bright area and the electroacoustic transfer function of the dark area.

11. The method according to any one of claims 6 to 10, characterized in that: The electroacoustic transfer function includes: Among them, H m,l It represents the electroacoustic transfer function from the lth loudspeaker to the mth microphone in the frequency domain. The electroacoustic transfer function corresponding to the microphone array in the bright area is the electroacoustic transfer function of the bright area, and the electroacoustic transfer function corresponding to the microphone array in the dark area is the electroacoustic transfer function of the dark area.

12. A control device for sound zones in a space, characterized in that: The sound zones include a bright zone and a dark zone, and the device includes: A first processing module is configured to determine a first sound source impulse response of a target sound field, where the first sound source impulse response is an impulse response of a preset sound source directly in front of the target sound field; The second processing module is configured to determine a driving signal for each loudspeaker based on the electroacoustic transfer function of the bright area, the first sound source impulse response, the electroacoustic transfer function of the dark area, and the optimization function.

13. A control system for sound zoning in a space, characterized in that: The sound zones include a bright zone and a dark zone, and the system includes a plurality of speakers and the control device according to claim 12.

14. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method for controlling sound zoning in a space as described in any one of claims 1 to 11 are implemented.

15. A vehicle, characterized in that: include: A processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method for controlling sound zoning in a space as described in any one of claims 1 to 11 are implemented.

16. A computer-readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method for controlling sound zoning in a space as claimed in any one of claims 1 to 11 are implemented. 17 . A computer program product, wherein when the program product is executed by a processor of a vehicle or a cloud server, the program product implements the steps of the method for controlling sound zoning in a space according to any one of claims 1 to 11.

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