Sound control method and device for vehicle cabin and vehicle

Abstract

The invention discloses a sound control method and device for a vehicle cabin and a vehicle. The method comprises the steps that a first sound signal sent by a first passenger in the vehicle is obtained, and position information of a second passenger in the vehicle is obtained; determining a second sound signal based on the first sound signal, the position information of the second passenger and the position information of first sound playing equipment in the vehicle; the first sound playing device is controlled to output a second sound signal, so that interference occurs when the first sound signal and the second sound signal are transmitted to the position where the second passenger is located, and the sound loudness of the position where the second passenger is located is smaller than a preset loudness threshold value. According to the invention, the technical problem of low privacy of conversation in the vehicle cabin is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sound elimination, and in particular relates to a sound control method and device for a vehicle cabin, and a vehicle. Background Art

[0002] In business scenarios, the conversations of people in the back seat of a vehicle can easily be overheard by the driver, which can lead to secrets being leaked.

[0003] In the prior art, partitions are installed inside the vehicle cabin to prevent the driver from hearing the conversations of the people in the back seat, but the effect is not ideal. The driver can still hear the conversations clearly, and the privacy of the conversations inside the vehicle cabin is low. Summary of the invention

[0004] The embodiments of the present invention provide a vehicle cabin sound control method, device and vehicle, which solve the technical problem of low privacy of conversation inside the vehicle cabin.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling sound in a vehicle cabin, comprising: obtaining a first sound signal emitted by a first occupant in a vehicle, and obtaining position information of a second occupant in the vehicle; determining a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of a first sound playback device in the vehicle; and controlling the first sound playback device to output the second sound signal so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second occupant, so that the loudness of the sound at the position of the second occupant is less than a preset loudness threshold.

[0006] In combination with the first aspect of the present invention, in some embodiments, a first sound collecting device is provided at a first cockpit position in the vehicle, and the first cockpit position is the position of the first occupant; obtaining a first sound signal emitted by the first occupant in the vehicle includes: collecting the first sound signal through the first sound collecting device.

[0007] In combination with the first aspect of the present invention, in some embodiments, the first cockpit position is a spatial area located above at least one rear seat in the vehicle, and the second occupant position information is position information of the driver's head position.

[0008] In combination with the first aspect of the present invention, in some embodiments, the driver wears a wearable device on his head, and a gyroscope is provided on the wearable device; obtaining the position information of the second passenger in the vehicle includes: obtaining motion data of the gyroscope; and determining the position information of the driver's head position based on the motion data of the gyroscope.

[0009] In combination with the first aspect of the present invention, in some embodiments, a camera is provided on the center console of the vehicle; obtaining the position information of the second passenger in the vehicle includes: obtaining the driver image taken by the camera; and determining the position information of the driver's head position based on the driver image.

[0010] In combination with the first aspect of the present invention, in some embodiments, determining the second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playing device in the vehicle includes: inputting the first sound signal, the position information of the second occupant, and the position information of the first sound playing device in the vehicle into a target signal generation model to obtain the second sound signal.

[0011] In conjunction with the first aspect of the present invention, in some embodiments, the target signal generation model is pre-established through the following steps: controlling a second sound playing device to play sound, and controlling a first sound collecting device to collect sound of the second sound playing device to obtain a third sound signal, the second sound playing device and the first sound collecting device being arranged at the first cockpit position; inputting the third sound signal into a preset first secondary path transfer function to obtain a fourth sound signal, the fourth sound signal being an actual sound signal after the third sound signal changes when propagating to a second cockpit position, the second cockpit position being the position of the second occupant; inputting the third sound signal, the second cockpit position and the position information of the first sound playing device into an initial signal generation model to obtain a fifth sound signal; determining a signal error between the fourth sound signal and the fifth sound signal; and iteratively optimizing the initial signal generation model based on the signal error to obtain the target signal generation model.

[0012] In combination with the first aspect of the present invention, in some embodiments, the initial signal generation model includes a phase inversion function and a second secondary path transfer function; the inputting the third sound signal, the second cockpit position and the position information of the first sound playing device into the initial signal generation model to obtain the fifth sound signal includes: inputting the third sound signal into the phase inversion function to obtain the sixth sound signal; inputting the sixth sound signal into the second secondary path transfer function to obtain the fifth sound signal, wherein the position-related parameters of the second secondary path transfer function are determined based on the second cockpit position and the position information of the first sound playing device.

[0013] In a second aspect, an embodiment of the present invention provides a sound control device for a vehicle cabin, comprising: a data acquisition unit, used to acquire a first sound signal emitted by a first occupant in the vehicle, and to acquire position information of a second occupant in the vehicle; a signal determination unit, used to determine a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of a first sound playback device in the vehicle; and a sound control unit, used to control the first sound playback device to output the second sound signal, so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second occupant, so that the loudness of the sound at the position of the second occupant is less than a preset loudness threshold.

[0014] In a third aspect, an embodiment of the present invention provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0015] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0016] The embodiment of the present invention obtains a first sound signal emitted by a first passenger in a vehicle, and obtains position information of a second passenger in the vehicle; determines a second sound signal based on the first sound signal, the position information of the second passenger, and the position information of a first sound playback device in the vehicle; and controls the first sound playback device to output the second sound signal so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second passenger, so that the loudness of the sound at the position of the second passenger is less than a preset loudness threshold. The loudness of the sound at the position of the second passenger is less than the preset loudness threshold, indicating that due to sound interference, when the first sound signal emitted by the first passenger propagates to the position of the second passenger, its loudness has been reduced to a smaller value, and the second passenger cannot clearly hear the content of the conversation. Therefore, the privacy of the conversation inside the vehicle cabin is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a flow chart of a vehicle cabin sound control method according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of an in-vehicle acoustic shield system device according to an embodiment of the present invention;

[0020] Figure 3 It is a technical roadmap of the in-vehicle acoustic shield system device in the embodiment of the present invention;

[0021] Figure 4 Schematic diagram of signal detection of an in-vehicle acoustic shield system device in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the silencing principle of the in-vehicle acoustic shield system device in an embodiment of the present invention;

[0023] Figure 6 is a functional module diagram of a vehicle cabin sound control device according to an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the structure of a vehicle in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The embodiment of the present invention provides a vehicle cabin sound control method, referring to Figure 1 As shown, the method includes the following steps S101 to S103:

[0028] S101: Acquire a first sound signal emitted by a first occupant in the vehicle, and acquire position information of a second occupant in the vehicle.

[0029] It should be noted that the first passenger may be a rear passenger of the vehicle, and the second passenger may be a front passenger of the vehicle. Specifically, the front passenger may be a driver in the driving seat or a passenger in the front passenger seat. In addition, the first passenger may also be a front passenger in the vehicle, and the second passenger may also be a rear passenger in the vehicle. In addition, the first passenger may also be a passenger in the front passenger seat of the vehicle, and the second passenger may also be a driver in the driving seat of the vehicle.

[0030] In some embodiments, a first sound collecting device is provided at a first cockpit position in the vehicle, where the first cockpit position is located; obtaining a first sound signal emitted by the first occupant in the vehicle may include: collecting the first sound signal through the first sound collecting device.

[0031] It should be noted that a second sound collection device can be set at the second cockpit position in the vehicle, and the second cockpit position is where the second occupant is located.

[0032] In some embodiments, the first cockpit position may be a spatial area located above at least one rear seat in the vehicle, and the position information of the second occupant may be position information of a driver's head position.

[0033] In some embodiments, the driver wears a wearable device on his head, and a gyroscope is provided on the wearable device; obtaining the position information of the second passenger in the vehicle may include: obtaining motion data of the gyroscope; and determining the position information of the driver's head position based on the motion data of the gyroscope.

[0034] It should be noted that determining the position information of the driver's head based on the motion data of the gyroscope avoids judging the head position through a camera, and there is no need to take photos or videos, thus avoiding the recording of the occupants' appearance features and the monitoring of their conversations, thereby protecting the privacy of the occupants.

[0035] In some embodiments, determining the position information of the driver's head position based on the motion data of the gyroscope can be: determining the first relative position of the driver's head and the driver's seat based on the motion data of the gyroscope; determining the position information of the driver's head position based on the first relative position and the position of the driver's seat.

[0036] In some embodiments, a camera is provided on the center console of the vehicle; obtaining the position information of the second passenger in the vehicle may include: obtaining an image of the driver taken by the camera; and determining the position information of the driver's head position based on the driver image.

[0037] It should be noted that when the position information of the driver's head position is determined by the camera on the center console, since the camera is placed at a large distance from the driver, the camera will not interfere with the driver, thereby improving driving safety.

[0038] In some embodiments, a rangefinder is provided on the driver's seat of the vehicle; obtaining the position information of the second passenger in the vehicle may include: obtaining the detection distance of the rangefinder, where the detection distance is the distance between the driver's head and the driver's seat; and determining the position information of the driver's head position based on the detection distance and the position of the driver's seat.

[0039] It should be noted that directly detecting the distance between the driver's head and the driver's seat through a rangefinder does not require a complicated data calculation process, thus reducing the complexity of function implementation.

[0040] S102: Determine a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playback device in the vehicle.

[0041] In some embodiments, determining the second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playing device in the vehicle may include: inputting the first sound signal, the position information of the second occupant, and the position information of the first sound playing device in the vehicle into a target signal generation model to obtain the second sound signal.

[0042] In some implementations, the target signal generation model is pre-established through the following steps, including the following steps S1021 to S1025:

[0043] S1021: Control the second sound playing device to play sound, and control the first sound collecting device to collect sound from the second sound playing device to obtain a third sound signal, wherein the second sound playing device and the first sound collecting device are arranged at a first cockpit position.

[0044] It should be noted that the second sound playing device is arranged at the first cockpit position to simulate the conversation of the first passenger during the test.

[0045] S1022: Input the third sound signal into a preset first secondary path transfer function to obtain a fourth sound signal, where the fourth sound signal is an actual sound signal after the third sound signal changes when propagating to a second cockpit position, where the second cockpit position is where the second occupant is located.

[0046] S1023: Inputting the third sound signal, the second cockpit position, and the position information of the first sound playing device into the initial signal generation model to obtain a fifth sound signal.

[0047] In some embodiments, the initial signal generation model includes a phase inversion function and a second secondary path transfer function; inputting the third sound signal, the second cockpit position, and the position information of the first sound playing device into the initial signal generation model to obtain a fifth sound signal may include: inputting the third sound signal into the phase inversion function to obtain a sixth sound signal; inputting the sixth sound signal into the second secondary path transfer function to obtain the fifth sound signal, wherein the position-related parameters of the second secondary path transfer function are determined based on the second cockpit position and the position information of the first sound playing device.

[0048] S1024: Determine a signal error between the fourth sound signal and the fifth sound signal.

[0049] S1025: Based on the signal error, iteratively optimize the initial signal generation model to obtain a target signal generation model.

[0050] In some embodiments, based on the signal error, the initial signal generation model is iteratively optimized to obtain the target signal generation model, which can be: based on the signal error, the initial signal generation model is iteratively optimized according to the least mean square of the FxLMS (Filtered-X Least Mean Square) algorithm to obtain the target signal generation model.

[0051] It should be noted that the FxLMS algorithm is an active noise control algorithm. It is based on the minimum mean square error (LMS) criterion and suppresses noise signals by establishing an adaptive filter. The FxLMS algorithm is an improvement on the LMS algorithm, taking into account the impact of the secondary sound channel on the active noise control system. The implementation of the FxLMS algorithm is relatively simple and the amount of calculation is small. Since the impact of the secondary sound channel is taken into account, the effect of sound suppression can be improved to a certain extent. Therefore, by iteratively optimizing the FxLMS algorithm to obtain the target signal generation model, the accuracy of the target signal generation model is improved, and the reduction of the amount of calculation and the improvement of the sound suppression effect are achieved.

[0052] S103: Control the first sound playback device to output the second sound signal, so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second passenger, so that the loudness of the sound at the position of the second passenger is less than a preset loudness threshold.

[0053] It should be noted that due to the small space in the car, it is difficult for children to play in the car.

[0054] The bustling and noisy sound can easily distract the driver from driving, making it difficult for the driver to concentrate on traffic judgment, which can easily affect driving safety. In business scenarios, the conversations of important people in the back row can be easily heard by the driver, which can easily leak secrets. Therefore, how to eliminate unnecessary voices of rear passengers is a technical problem that needs to be solved urgently in current automobile development. The embodiment of the present invention provides an effective in-vehicle silencing technology, which is based on the hardware equipment and algorithm of the active noise reduction system and adopts the secondary channel silencing method. In the silencing scene, the front driver cannot hear the voices of the rear passengers, so as to protect the privacy of the rear row and improve the driver's concentration on driving. The purpose of the embodiment of the present invention is to eliminate the voices of the rear passengers that the driver does not want to hear in the silencing scene. Based on the existing vehicle active noise reduction system, a hardware system is provided: an error microphone, an active noise reduction controller, and an audio system to perform real-time noise reduction of the voices of the rear passengers. This system can be composed of sound recognition, a controller algorithm, and a secondary channel sound system.

[0055] It should be noted that, based on the embodiment of the present invention, an in-vehicle sound shield system device of an active noise reduction system can be obtained, including a microphone array, which consists of a number of microphones arranged uniformly and linearly, and the microphone array can collect noise signals from the front and rear rows and provide them to the controller for feedback; a data acquisition and processing system, including a delay estimation module, a delay compensation module and an adaptive filtering module, so as to calculate the anti-phase noise signal according to the reference signal and the error signal, and an execution system, generally a speaker, for outputting a secondary sound signal, such as Figure 2 As shown, Figure 2It is a schematic diagram of the in-vehicle sound shield system device in an embodiment of the present invention. The microphone can be arranged near the head of the occupant, not limited to the seat headrest, ceiling and window position. The speaker can use the in-vehicle speaker, preferably the headrest speaker but not limited to the door speaker; the following is an explanation of the steps for setting the in-vehicle sound shield system device: Step 1, use wires to connect these devices, including the power line connecting the controller and the power supply, the A2B bus between the microphone and the controller, and the audio line connecting the controller and the speaker. Step 2, the offline identification of the additional noise of the secondary path uses the least mean square (Least Mean Square, LMS) algorithm. The specific identification process is as follows. It needs to be carried out in a semi-anechoic room, with the doors and windows closed, the test sample car turned off, and the test personnel in the car kept quiet; Step 3, respectively control the secondary sound sources (such as headrest speakers) at different positions to emit additional noise a (n) (sweep frequency signal covering the human voice frequency); Step 4, by adjusting the FxLMS module, the filter weight coefficient is continuously adjusted so that the output signal is constantly approaching the expected signal until the residual error signal approaches zero, and finally the FIR filter coefficient of the secondary channel is obtained. Step 5. The signal d(n) after a(n) passes through the first secondary path transfer function P(z) is collected by the error microphone and saved as the expected signal for adaptive modeling. Step 6. The reference signal a(n) passes through the road noise active controller weight coefficient W(z) to obtain the output noise cancellation signal u(n). Step 7. Based on the secondary channel transfer function characteristics in the vehicle, the noise signal u(n) is converted into the filter output noise reduction signal y(n) at time n through the second secondary path transfer function S(z). The method for calculating the secondary noise at the error microphone refers to the following formula (1). Wherein, x(ni) is the random reference signal at time ni, is the secondary path transfer function at time n. Step 8, the microphone is arranged near the ears of the driver and the passenger to monitor the error between the output signal y(n) and the expected signal d(n). The method for calculating the error signal e(n) refers to formula (2). Step 9, using the FxLMS algorithm with the least mean square as the criterion, iterate according to the principle of the steepest descent method, and the data processing system continuously optimizes the adaptive modeling parameters according to the residual signal, referring to formula (3), where, is the secondary path transfer function at time n+1, x(n) is the random reference signal at time n, and u is the step size optimization coefficient. Step 10, repeat steps 7 to 9. When e(n) is small enough, the identification effect is good, and the relationship of formula (4) is obtained. The complete technical route is as follows: Figure 3 As shown, Figure 3This is the technical roadmap of the in-vehicle sound shield system equipment in the embodiment of the present invention. Step 11, when the sound shield system is working, the microphone sensor automatically generates the expected signal d(n) based on the a(n) signal by collecting the surrounding sound field environment, and then identifies the error between its output signal y(n) and the expected signal d(n) through the microphone based on the secondary path transfer function, and iterates through the FxLMS algorithm based on the principle of the steepest descent method. The sound field is automatically adjusted in different scenarios to achieve the optimal effect of front row noise reduction, refer to Figure 4 As shown, Figure 4 Schematic diagram of signal detection of in-vehicle acoustic shield system equipment in an embodiment of the present invention. Step 12, the speaker system may be a vehicle-mounted audio system, which emits different secondary sound sources according to different sound field environments in the vehicle to interfere with the sound waves in the canceled area, forming a sound cancellation area, thereby achieving an acoustic shield effect, see reference Figure 5 As shown, Figure 5 Schematic diagram of the noise reduction principle of the in-vehicle sound shield system device in an embodiment of the present invention.

[0056]

[0057] e(n)=d(n)-y(n) (2)

[0058]

[0059] It should be noted that before the voice sound waves in the back row reach the ears, the microphone is used to monitor the voice noise in the environment in advance, and the noise signal is transmitted to the control circuit. After real-time inversion operation on the chip, the specific position of the driver's head is tracked, and the speaker emits a sound wave with the opposite phase to the noise but the same frequency and amplitude, which interferes with the noise to achieve phase cancellation and achieve the effect of a sound shield. The embodiment of the present invention realizes the in-vehicle sound shield function without increasing the hardware cost. It also eliminates unnecessary sounds of rear passengers, protects the privacy of the rear seats, and improves the driver's concentration on driving.

[0060] The embodiment of the present invention obtains a first sound signal emitted by a first passenger in a vehicle, and obtains position information of a second passenger in the vehicle; determines a second sound signal based on the first sound signal, the position information of the second passenger, and the position information of a first sound playback device in the vehicle; and controls the first sound playback device to output the second sound signal so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second passenger, so that the loudness of the sound at the position of the second passenger is less than a preset loudness threshold. The loudness of the sound at the position of the second passenger is less than the preset loudness threshold, indicating that due to sound interference, when the first sound signal emitted by the first passenger propagates to the position of the second passenger, its loudness has been reduced to a smaller value, and the second passenger cannot clearly hear the content of the conversation. Therefore, the privacy of the conversation inside the vehicle cabin is improved.

[0061] Based on the same inventive concept, Figure 6 As shown, an embodiment of the present invention provides a sound control device 10 for a vehicle cabin, comprising: a data acquisition unit 110, used to acquire a first sound signal emitted by a first occupant in the vehicle, and to acquire position information of a second occupant in the vehicle; a signal determination unit 120, used to determine a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of a first sound playback device in the vehicle; and a sound control unit 130, used to control the first sound playback device to output the second sound signal, so that the first sound signal and the second sound signal interfere with each other when propagating to the position of the second occupant, so that the loudness of the sound at the position of the second occupant is less than a preset loudness threshold.

[0062] It can be understood that a first sound collecting device is provided at a first cockpit position in the vehicle, where the first passenger is located; the data acquiring unit 110 comprises: a first acquiring subunit, for collecting a first sound signal through the first sound collecting device.

[0063] The first cockpit position is a spatial area located above at least one rear seat in the vehicle, and the second passenger position information is position information of the driver's head position.

[0064] It can be understood that the driver wears a wearable device on his head, and a gyroscope is arranged on the wearable device; the data acquisition unit 110 also includes: a second acquisition subunit, which can be specifically used to obtain the motion data of the gyroscope; based on the motion data of the gyroscope, the position information of the driver's head position is determined.

[0065] It is understandable that a camera is provided on the center console of the vehicle; the second acquisition subunit may also be specifically used to acquire the driver image taken by the camera; based on the driver image, the position information of the driver's head position is determined.

[0066] It can be understood that the signal determination unit 120 is specifically used to input the first sound signal, the position information of the second occupant and the position information of the first sound playback device in the vehicle into the target signal generation model to obtain the second sound signal.

[0067] It can be understood that the sound control device 10 for the vehicle cabin also includes: a model building unit, which is used to build a target signal generation model, including the following steps: controlling the second sound playing device to play sound, and controlling the first sound collecting device to collect the sound of the second sound playing device to obtain a third sound signal, the second sound playing device and the first sound collecting device are arranged at the first cabin position; inputting the third sound signal into a preset first secondary path transfer function to obtain a fourth sound signal, the fourth sound signal is an actual sound signal after the third sound signal changes when propagating to the second cabin position, the second cabin position is the position of the second occupant; inputting the third sound signal, the second cabin position and the position information of the first sound playing device into the initial signal generation model to obtain a fifth sound signal; determining the signal error between the fourth sound signal and the fifth sound signal; and iteratively optimizing the initial signal generation model based on the signal error to obtain the target signal generation model.

[0068] Wherein, the initial signal generation model includes a phase inversion function and a second secondary path transfer function; the third sound signal, the second cockpit position and the position information of the first sound playback device are input into the initial signal generation model to obtain the fifth sound signal, including: inputting the third sound signal into the phase inversion function to obtain the sixth sound signal; inputting the sixth sound signal into the second secondary path transfer function to obtain the fifth sound signal, wherein the position-related parameters of the second secondary path transfer function are determined according to the second cockpit position and the position information of the first sound playback device.

[0069] It should be understood that more implementation details of the vehicle cockpit sound control device 10 in the embodiment of the present invention are described in the aforementioned vehicle cockpit sound control method, and for the sake of brevity of the specification, they are not repeated here.

[0070] Based on the same inventive concept, an embodiment of the present invention further provides a vehicle, such as Figure 7 As shown, it includes a memory 704, a processor 702, and a computer program stored in the memory 704 and executable on the processor 702. The processor 702 executes the program to implement the steps described in any implementation of the vehicle cabin sound control method embodiment.

[0071] Among them, Figure 7In the embodiment of the present invention, a bus architecture (represented by bus 700) is shown, which may include any number of interconnected buses and bridges, and bus 700 links various circuits including one or more processors represented by processor 702 and memory represented by memory 704. Bus 700 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 705 provides an interface between bus 700 and receiver 701 and transmitter 703. Receiver 701 and transmitter 703 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 702 is responsible for managing bus 700 and general processing, while memory 704 may be used to store data used by processor 702 when performing operations.

[0072] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0074] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0075] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0076] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the sound of a vehicle cabin, characterized in that: include: Acquiring a first sound signal emitted by a first occupant in the vehicle, and acquiring position information of a second occupant in the vehicle; determining a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playback device in the vehicle; The first sound playing device is controlled to output the second sound signal so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second occupant, so that the loudness of the sound at the position of the second occupant is less than a preset loudness threshold.

2. The vehicle cabin sound control method according to claim 1, characterized in that: A first sound collecting device is arranged at a first cockpit position in the vehicle, where the first cockpit position is where the first passenger is located; The acquiring a first sound signal emitted by a first occupant in the vehicle includes: collecting the first sound signal by using the first sound collecting device.

3. The vehicle cabin sound control method according to claim 2, characterized in that: The first cockpit position is a spatial area located above at least one rear seat in the vehicle, and the second occupant position information is position information of a driver's head position.

4. The vehicle cabin sound control method according to claim 3, characterized in that: The driver wears a wearable device on his head, and the wearable device is provided with a gyroscope; The obtaining the position information of the second passenger in the vehicle includes: Acquiring motion data of the gyroscope; Based on the motion data of the gyroscope, position information of the driver's head position is determined.

5. The vehicle cabin sound control method according to claim 3, characterized in that: A camera is arranged on the center console of the vehicle; The obtaining the position information of the second passenger in the vehicle includes: Acquire the driver image captured by the camera; Based on the driver image, position information of the driver's head position is determined.

6. The vehicle cabin sound control method according to claim 2, characterized in that: The determining the second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playing device in the vehicle includes: The first sound signal, the position information of the second occupant and the position information of the first sound playback device in the vehicle are input into a target signal generation model to obtain the second sound signal.

7. The vehicle cabin sound control method according to claim 6, characterized in that: The target signal generation model is established in advance through the following steps: Controlling a second sound playing device to play sound, and controlling a first sound collecting device to collect sound from the second sound playing device to obtain a third sound signal, wherein the second sound playing device and the first sound collecting device are arranged at the first cockpit position; Inputting the third sound signal into a preset first secondary path transfer function to obtain a fourth sound signal, wherein the fourth sound signal is an actual sound signal after the third sound signal is changed when propagating to a second cockpit position, wherein the second cockpit position is a position where the second occupant is located; Inputting the third sound signal, the second cockpit position and the position information of the first sound playing device into an initial signal generation model to obtain a fifth sound signal; determining a signal error between the fourth sound signal and the fifth sound signal; Based on the signal error, the initial signal generation model is iteratively optimized to obtain the target signal generation model.

8. The vehicle cabin sound control method according to claim 7, characterized in that: The initial signal generation model includes a phase inversion function and a second secondary path transfer function; the third sound signal, the second cockpit position, and the position information of the first sound playback device are input into the initial signal generation model to obtain a fifth sound signal, including: Inputting the third sound signal into the phase inversion function to obtain a sixth sound signal; The sixth sound signal is input into the second secondary path transfer function to obtain the fifth sound signal, wherein the position-related parameter of the second secondary path transfer function is determined according to the position information of the second cockpit position and the first sound playing device.

9. A sound control device for a vehicle cabin, characterized in that: include: a data acquisition unit, configured to acquire a first sound signal emitted by a first occupant in the vehicle, and acquire position information of a second occupant in the vehicle; a signal determination unit, configured to determine a second sound signal based on the first sound signal, the position information of the second occupant, and the position information of the first sound playback device in the vehicle; and a sound control unit, for controlling the first sound playback device to output the second sound signal, so that the first sound signal and the second sound signal interfere with each other when they propagate to the position of the second occupant, so that the loudness of the sound at the position of the second occupant is less than a preset loudness threshold.

10. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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