WO2020062978A1 - 一种车内声场调节方法及音频*** - Google Patents

一种车内声场调节方法及音频*** Download PDF

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Publication number
WO2020062978A1
WO2020062978A1 PCT/CN2019/093426 CN2019093426W WO2020062978A1 WO 2020062978 A1 WO2020062978 A1 WO 2020062978A1 CN 2019093426 W CN2019093426 W CN 2019093426W WO 2020062978 A1 WO2020062978 A1 WO 2020062978A1
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Prior art keywords
audio signal
sound field
speaker
audio
human ear
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PCT/CN2019/093426
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English (en)
French (fr)
Inventor
于豪
齐晗
Original Assignee
广州小鹏汽车科技有限公司
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Publication of WO2020062978A1 publication Critical patent/WO2020062978A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/026—Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer

Definitions

  • the invention relates to the technical field of audio processing, in particular to a method for adjusting sound field in a car and an audio system.
  • the embodiment of the invention discloses a method and an audio system for adjusting a sound field in a car, which can achieve a surround sound field effect.
  • a first aspect of an embodiment of the present invention discloses a method for adjusting a sound field in a car.
  • the method is applied to an audio system including multiple speakers, and the multiple speakers are arranged around a car seat; the method includes:
  • the multi-channel speakers are respectively arranged at the following positions: the door of the car, the front center console, the ceiling, the rear shelf, and the floor. And the car seat.
  • the method further includes:
  • the identifying the position of the audio signal of each channel in the sound field includes:
  • the identifying a human ear position of a user on the car seat includes:
  • the camera is controlled to capture a facial image including the face of the user located on the car seat, and to recognize the position of the ear of the user based on the facial image.
  • a second aspect of the embodiments of the present invention discloses an audio system, including:
  • Multi-channel speakers which are arranged around the car seat
  • An identification and positioning module configured to identify a human ear position of a user on the car seat
  • a distance determining module configured to determine a relative distance between each of the multiple speakers and the human ear according to the position of the human ear;
  • An audio processing module is configured to adjust the amplitude of the audio signal played by each speaker in the frequency domain according to the relative distance, so that the volume of the audio signal played by each speaker when reaching the human ear is the same.
  • the multi-channel speakers are respectively arranged at the following positions: the door of the car, the front center console, the ceiling, the rear shelf, and the floor And the car seat.
  • system further includes:
  • Audio receiving module for receiving multi-channel audio signal input
  • An orientation identification module configured to identify an orientation of an audio signal of each of the channels in a sound field
  • a speaker determining module configured to determine a speaker whose arrangement position corresponds to an orientation of the audio signal in a sound field
  • a speaker control module is configured to control a speaker corresponding to the orientation to play the audio signal.
  • the manner in which the orientation recognition module is configured to identify the orientation of the audio signal of each channel in the sound field is specifically:
  • the orientation identification module is configured to read the orientation information included in the encoding of the audio signal to obtain the orientation of the audio signal of each channel in the sound field, and the orientation information is used to indicate the audio during recording. The position of the signal in the sound field.
  • the identification and positioning module configured to identify a human ear position of a user on the car seat, includes:
  • the recognition and positioning module is configured to control a camera to capture a facial image including a face of a user located on the car seat, and identify a position of the ear of the user based on the facial image.
  • a third aspect of the embodiments of the present invention discloses an audio system, including:
  • a central microprocessor coupled to the memory
  • Multi-channel speakers face positioning module, digital audio processor, multi-channel audio power amplifier 606, and power management module; among them, the multi-channel speakers are arranged around the car seat; optionally, they can be arranged in the car door, The front center console, ceiling, rear shelf, floor and car seat; the central microprocessor calls the executable program code stored in the memory to execute any method disclosed in the first aspect of the embodiments of the present invention.
  • a fourth aspect of the present invention discloses a computer-readable storage medium that stores a computer program, wherein the computer program causes a computer to execute any one of the methods disclosed in the first aspect of the embodiments of the present invention.
  • a fifth aspect of the embodiments of the present invention discloses a computer program product, and when the computer program product runs on a computer, the computer is caused to execute any method disclosed in the first aspect of the embodiments of the present invention.
  • multiple speakers are arranged around a car seat, so that after a user sits in a car seat, a three-dimensional sound field can be generated through the multiple speakers set around the user.
  • the relative distance between each channel of the speaker and the position of the human ear can be determined; according to the relative distance between each channel of the speaker and the position of the human ear, adjusting the frequency domain of the speaker when playing audio signals Amplitude so that the audio signal played by each speaker reaches the same volume when it reaches the human ear.
  • the attenuation of the sound due to distance during transmission can be compensated, and the sound position shift caused by the difference in volume can be reduced, which can simulate a more realistic
  • the sound field effect makes the sound heard by users more three-dimensional and full.
  • FIG. 1 is a diagram illustrating a layout example of a speaker according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another method for adjusting a sound field in a car disclosed in an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of another method for adjusting a sound field in a car disclosed in an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an audio system disclosed by an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another audio system disclosed by an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another audio system disclosed by an embodiment of the present invention.
  • the embodiment of the invention discloses a method and an audio system for adjusting a sound field in a car, which can achieve a surround sound field effect. Each of them will be described in detail below.
  • FIG. 1 is a diagram illustrating a layout example of a speaker according to an embodiment of the present invention.
  • the speakers can be arranged in the following positions: the car door, the front center console, the ceiling, the rear shelf, the floor and the seat; specifically, the speakers on the seat can be arranged on the seat Headrest.
  • a stereo field can be generated through multiple speakers set around the user, especially speakers placed on the ceiling and floor, which can create a sound source located at Sound field effects above and below the user's head.
  • the speaker position layout disclosed in the embodiment of the present invention can create a stereo field for the user. Compared with a two-dimensional planar sound field, the user can experience a 360-degree surround sound effect in the stereo field, which is more realistic and natural.
  • FIG. 2 is a schematic flowchart of a method for adjusting a sound field in a vehicle disclosed in an embodiment of the present invention.
  • the method for adjusting the sound field in a car described in FIG. 2 is applicable to audio systems such as a car audio and video entertainment system and a car audio system, which are not limited in the embodiment of the present invention.
  • the method for adjusting the sound field in a car may include the following steps:
  • the audio system recognizes the ear position of a user on a car seat.
  • the camera when a user enters a car and rides, the camera can be controlled to take a facial image of the user's face located on a car seat, and image processing such as edge detection and feature extraction can be performed.
  • image processing such as edge detection and feature extraction can be performed.
  • image processing such as edge detection and feature extraction
  • the human ear recognition model is a deep neural network trained using a large number of facial images labeled with human ears.
  • the relative position of the camera and the human ear can be calculated based on the position of the human ear in the facial image, and the person can be determined The position of the ear in the car.
  • the ultrasonic wave can be transmitted and received by the ultrasonic transceiver module, and the reflected wave of the ultrasonic wave can be received; by analyzing the reflected wave, the possible ultrasonic wave can be identified within the detection range of the ultrasonic wave.
  • the human ear and determine the position of the human ear.
  • the audio system determines the relative distance between each speaker in the multi-channel speaker and the human ear according to the position of the human ear.
  • the layout position of each speaker in the car is fixed and known; performing step 201 described above, the audio system can determine the position of the human ear in the car; according to each The layout position of a speaker in the car and the position of the human ear in the car can determine the relative distance of each speaker from the human ear.
  • a coordinate system can be established in a car, the coordinate system uses an object in the car as the origin, and the position of each speaker in the car and the ears of the person in the car are expressed in the coordinate system. Location.
  • the audio system adjusts the amplitude of the audio signal played by each speaker in the frequency domain according to the foregoing relative distance, so that the audio signal played by each speaker reaches the same volume when it reaches the human ear.
  • the relative distance between each speaker and the position of the human ear is different.
  • the relative distance between the speaker arranged on the door of the main driver's side and the user is smaller than the relative distance of the speaker arranged on the door of the front passenger's side and the user.
  • the relative distance between the speaker and the user is smaller than the relative distance between the speaker and the user arranged on the rear shelf.
  • the heard volume is attenuated by 6dB. If the volume attenuation is not compensated, when using an audio system to play an audio program, the user hears that the volume of the audio signal played by each speaker is different, which will affect the user's hearing experience. The sound field restored by the audio system and the recording The sound field gap in audio programs is large. Continue to take the user in the car's main driver's seat as an example. Assume that the user uses the audio system to play songs.
  • the user hears that the loudspeaker placed on the door of the main driver's side plays a large volume and is placed in the first officer
  • the volume played by the speaker of the side door is relatively low, which will make the user feel like the singer is vocalizing on his left side. Such a sound effect is not in line with human listening habits.
  • the amplitude of the audio signal played by the speaker in the frequency domain is adjusted according to the relative distance between each speaker and the human ear, so that the audio signal played by each speaker reaches the same volume when it reaches the human ear. It can reduce the sound attenuation caused by the transmission distance, reduce the shift of the sound position felt by the user due to the difference in volume, and create a surround sound field effect for the user.
  • step 203 may specifically be:
  • the audio system determines the speaker with the shortest relative distance from the human ear position as the reference speaker from the multi-channel speakers, and increases the amplitude of the other speakers of the multi-channel speaker except the reference speaker in the frequency domain.
  • the amplitude of the audio signal played by the reference speaker in the frequency domain is used as the reference amplitude
  • the relative distance between the reference speaker and the human ear position is used as the reference distance.
  • the manner in which the audio system performs step 203 above may specifically be:
  • the audio system determines the speaker with the longest relative distance from the human ear position as the reference speaker from the multi-channel speakers, and reduces the amplitude in the frequency domain of the other speakers except the reference speaker.
  • the amplitude of the audio signal played by the reference speaker in the frequency domain is used as the reference amplitude
  • the relative distance between the shortest speaker and the position of the human ear is used as the reference distance.
  • the amplitude of the audio signal played by the speaker in the frequency domain is reduced by a specified value based on the reference amplitude.
  • the audio system can identify the position of the human ear of the user on the car seat, and then determine the relative distance between each speaker and the position of the human ear, so as to play each speaker according to the relative distance.
  • the audio signal is compensated, so that the audio signals played by each speaker reach the same volume when they reach the human ear, which can reduce the sound attenuation caused by the transmission distance, reduce the shift in sound position caused by the difference in volume, and create a surround for the user Surrounded stereo field effect.
  • FIG. 3 is a schematic flowchart of another method for adjusting a sound field in a car disclosed in an embodiment of the present invention.
  • the method for adjusting the sound field in a car may include the following steps:
  • the audio system recognizes the ear position of a user on a car seat.
  • the audio system determines the relative distance between each speaker in the multi-channel speaker and the human ear according to the position of the human ear.
  • the speaker may be a speaker array to improve the directivity of each speaker.
  • the audio system receives multi-channel audio signal input, and identifies the position of the audio signal of each channel in the sound field.
  • the encoding of the audio signal may include position information, which is used to indicate the position of the audio signal in the sound field during recording.
  • position information which is used to indicate the position of the audio signal in the sound field during recording.
  • the sound heard by the user in the real environment comes from all directions.
  • different channels can be used to save the sound from different directions, and the sound in each direction can be recorded relative to the listener.
  • the position of the sound source that is, the position of the audio signal in the sound field.
  • orientation information may be added during encoding.
  • the orientation information contained in the encoding may be read to obtain the orientation of the audio signal in the sound field.
  • the audio system determines a speaker whose arrangement position corresponds to the orientation of the audio signal in the sound field.
  • the audio system controls the speaker corresponding to the position of the audio signal in the sound field to play the audio signal, and when playing the audio signal, adjusts the amplitude of the audio signal played by each speaker in the frequency domain according to the above-mentioned relative distance, so that each The audio signal played by one speaker reaches the same volume when it reaches the human ear.
  • an audio program contains the roar of an aircraft engine.
  • the position of the roar in the sound field is above the head of the listener.
  • the position information is encoded at the same time. Read the code to identify the direction of the audio signal corresponding to the roar in the sound field above the head of the listener. Then you can control the speakers arranged on the ceiling to play the roar of the aircraft engine, and create the sound of the aircraft flying from above for users inside the car. effect.
  • the audio system can adjust the amplitude of the audio signal played by each speaker in the frequency domain according to the relative position between the speaker and the position of the human ear. Position offset to create a surround sound field effect for the user. Further, in the method described in FIG. 3, the audio system can control the corresponding speaker to play the audio signal according to the orientation of the audio signal in the sound field, so that the recording time can be restored.
  • the sound source position provides users with a real sound field effect.
  • FIG. 4 is a schematic structural diagram of an audio system according to an embodiment of the present invention.
  • the audio system may include:
  • the multi-channel speaker 401 is arranged around the car seat; optionally, it can be specifically arranged on the car door, the front center console, the ceiling, the rear shelf, the floor and the car seat;
  • An identification and positioning module 402 configured to identify a human ear position of a user on a car seat
  • the recognition and positioning module 402 may control the camera to capture a facial image including a user's face located on a car seat, and recognize a human ear in the facial image from the facial image through image processing methods such as edge detection and feature extraction Or the facial image is used as the data input of the human ear recognition model, and the output of the human ear recognition model is the position of the human ear in the facial image; wherein the human ear recognition model uses a large number of faces labeled with human ears Deep neural network obtained from image training; according to the position of the human ear in the facial image and the placement of the camera inside the car, the position of the human ear in the car can be determined;
  • a distance determining module 403, configured to determine the relative distance between each of the multiple speakers and the human ear according to the position of the human ear identified by the identification and positioning module 402;
  • the audio processing module 404 is configured to adjust the amplitude of the audio signal played by each speaker in the frequency domain according to the relative distance determined by the distance determination module 403, so that the audio signal played by each speaker reaches the same volume when reaching the human ear;
  • the audio processing module 404 power-amplifies the adjusted audio signal to drive each of the multiple speakers 401 to play the audio signal.
  • the audio processing module 404 may determine the speaker with the shortest relative distance from the human ear position as the reference speaker from the multi-channel speaker, and improve the frequency of the other speakers in the multi-channel speaker except the reference speaker. Amplitude in the domain; optionally, the audio processing module 404 uses the amplitude of the audio signal played by the reference speaker in the frequency domain as the reference amplitude and the relative distance between the reference speaker and the human ear position as the reference distance. For other speakers other than the reference speaker, each time the relative distance between the speaker and the human ear increases by a reference distance, the amplitude of the audio signal played by the speaker in the frequency domain is increased by the specified value based on the reference amplitude.
  • the audio processing module 404 may also determine the speaker with the longest relative distance from the human ear position as the reference speaker from the multi-channel speakers, and reduce other speakers in the multi-channel speaker except the reference speaker. Amplitude in the frequency domain.
  • the optional audio processing module 404 uses the amplitude of the audio signal played by the reference speaker in the frequency domain as the reference amplitude and the relative distance between the shortest speaker and the position of the human ear as the reference distance. For other speakers, each reference distance of the speaker and the human ear is increased by a reference distance, and the amplitude of the audio signal played by the speaker in the frequency domain is reduced by a specified value based on the reference amplitude.
  • the implementation of the audio system shown in FIG. 4 can identify the position of the human ear of the user on the car seat, and then determine the relative distance between each speaker and the position of the human ear, so that the audio played by each speaker is based on the relative distance.
  • the signal is compensated, so that the audio signals played by each speaker reach the same volume when they reach the human ear, which can reduce the sound attenuation caused by the transmission distance, reduce the displacement of the sound position that the user feels, and create a surround and surround Stereo field effect.
  • FIG. 5 is a schematic structural diagram of an audio system according to an embodiment of the present invention.
  • the audio system shown in FIG. 5 is obtained by optimizing the audio system shown in FIG. 4.
  • the audio system may further include:
  • An audio receiving module 405, configured to receive a multi-channel audio signal input
  • An orientation identification module 406, configured to identify the orientation of the audio signal of each channel received by the audio receiving module 405 in the sound field
  • the orientation identification module 406 may specifically read the orientation information contained in the encoding of the audio signal to obtain the orientation of the audio signal of each channel in the sound field; wherein, the aforementioned orientation information is used to indicate the audio during recording. The position of the signal in the sound field;
  • a speaker determination module 407 configured to determine a speaker corresponding to the arrangement position and the position of the audio signal identified by the orientation recognition module 406 in the sound field;
  • the speaker control module 408 is configured to control, according to the processing result of the speaker determination module 407, the speaker corresponding to the position of the audio signal in the sound field in the multi-channel speaker 401 to play the audio signal.
  • the speaker in the multi-channel speaker 401 may use a speaker array to improve the directivity of each channel speaker.
  • the audio signal played by the speaker corresponds to the position of the speaker in the sound field, and the audio signal played by each speaker reaches the same volume when it reaches the human ear, so that the recording can be restored.
  • FIG. 6 is a schematic structural diagram of an audio system according to an embodiment of the present invention.
  • the audio system may include:
  • a memory 601 storing executable program code
  • DSP Digital Signal Processing
  • the multi-way speaker 603 is arranged around the car seat; optionally, it can be specifically arranged on the car door, the front center console, the ceiling, the rear shelf, the floor and the car seat; the power management module 607 is Each of the above functional modules provides suitable voltage and current to ensure the normal operation of the audio system; the central microprocessor 601 calls the executable program code stored in the memory 602 to execute the method for adjusting the sound field in the car shown in FIG. 1 or FIG. 2. Specifically, each function module can be controlled to perform the following operations:
  • the face positioning module 604 identifies the ear position of the user on the car seat; optionally, the face positioning module 604 can control the camera to capture a facial image including the user's face located on the car seat, and recognize the user's Human ear position; the central microprocessor 602 obtains the position of the human ear positioned by the face positioning module 604, and determines the relative distance between each of the multiple speakers 603 and the human ear; the digital audio processor 605 according to the central microprocessor 602 Determine the relative distance, adjust the amplitude of the audio signal played by each speaker in the multi-channel speaker 603 in the frequency domain, and power-amplify the adjusted audio signal through the multi-channel audio power amplifier 606 to drive the multi-channel speaker 603.
  • Each of the speakers of the audio channel plays audio signals, and the audio signals of each audio channel play the same volume when reaching the human ear.
  • the central microprocessor 602 can also receive multi-channel audio signal input and identify the position of the audio signal of each channel in the sound field; specifically, the position information contained in the encoding of the audio signal can be read To obtain the position of the audio signal of each channel in the sound field; the above-mentioned position information is used to indicate the position of the audio signal in the sound field during recording; further, the central microprocessor 602 can determine the arrangement position and the audio signal in the sound field The speaker corresponding to the position in the middle; after the multi-channel audio power amplifier 606 power-amplifies the adjusted audio signal, the speaker corresponding to the position of the audio signal in the sound field is driven to play the audio signal.
  • An embodiment of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute any one of the in-vehicle sound field adjustment methods shown in FIG. 1 or FIG. 2.
  • An embodiment of the present invention discloses a computer program product.
  • the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute any one of FIG. 1 or FIG. 2.
  • an embodiment or “an embodiment” mentioned throughout the specification means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention.
  • the appearances of "in one embodiment” or “in an embodiment” appearing throughout the specification are not necessarily referring to the same embodiment.
  • the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
  • the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present invention.
  • the units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • the functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • the above integrated unit may be implemented in the form of hardware or in the form of software functional unit.
  • the technical solution of the present invention essentially or part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory , Including a number of requests to cause a computer device (which may be a personal computer, a server, or a network device, specifically a processor in a computer device) to perform part or all of the steps of the above methods of the embodiments of the present invention.
  • a computer device which may be a personal computer, a server, or a network device, specifically a processor in a computer device
  • the program may be stored in a computer-readable storage medium, and the storage medium includes a read-only Memory (Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-only Memory (PROM), Erasable Programmable Read Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), electronically erasable rewritable read-only memory (Electrically-Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.
  • ROM read-only Memory
  • RAM Random Access Memory
  • PROM Programmable Read-only Memory
  • EPROM Erasable Programmable Read Only Memory
  • OTPROM One-time Programmable Read-Only Memory
  • EEPROM Electrical erasable rewritable read-only memory
  • CD-ROM Compact Disc Read-Only Memory
  • CD-ROM Compact Disc Read-Only

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Abstract

一种车内声场调节方法及音频***，所述方法应用于包含多路扬声器的音频***，所述多路扬声器布置在汽车座椅的四周；所述方法包括：识别所述汽车座椅上用户的人耳位置；根据所述人耳位置确定所述多路扬声器中每一路扬声器与所述人耳的相对距离；根据所述相对距离调整所述每一路扬声器播放的音频信号在频域上的幅度，以使所述每一路扬声器播放的音频信号在到达所述人耳时的音量相同。实施本发明实施例，能够通过环绕用户设置的扬声器营造立体声场效果，还可以减少音量差造成用户感受到的发声位置偏移，从而可以模拟出较为真实的声场效果，使得用户听到的声音更加立体饱满。

Description

一种车内声场调节方法及音频***
技术领域
本发明涉及音频处理技术领域，具体涉及一种车内声场调节方法及音频***。
背景技术
目前，汽车内音响技术大部分都是两维声场的传统技术，其声场规模较为扁平，难以产生立体的声场效果。而实际上，一个理想的声场应该具有一定的高度、宽度和深度，使用户在理想的声场中听到的声音具有一定的方向感和层次感，并且能够通过听觉还原录制时的声场效果，更加接近真实的声场环境。可见，目前的汽车内音响技术难以满足用户对车载音响立体声场的需求。
发明内容
本发明实施例公开了一种车内声场调节方法及音频***，能够达到环绕包围的立体声场效果。
本发明实施例第一方面公开一种车内声场调节方法，所述方法应用于包含多路扬声器的音频***，所述多路扬声器布置在汽车座椅的四周；所述方法包括：
识别所述汽车座椅上用户的人耳位置；
根据所述人耳位置确定所述多路扬声器中每一路扬声器与所述人耳的相对距离；
根据所述相对距离调整所述每一路扬声器播放的音频信号在频域上的幅度，以使所述每一路扬声器播放的音频信号在到达所述人耳时的音量相同。
作为一种可选的实施方式，在本发明实施例第一方面中，所述多路扬声器分别布置于以下位置：所述汽车的车门、前方中控台、顶棚、后置搁物板、地板以及所述汽车座椅。
作为一种可选的实施方式，在本发明实施例第一方面中，所述方法还包括：
接收多声道的音频信号输入；
识别各个所述声道的音频信号在声场中的方位；
确定布置位置与所述音频信号在声场中的方位对应的扬声器；
控制与所述方位对应的扬声器播放所述音频信号。
作为一种可选的实施方式，在本发明实施例第一方面中，所述识别各个所述声道的音频信号在声场中的方位，包括：
读取所述音频信号的编码中包含的方位信息，以获得各个所述声道的音频信号在声场中的方位，所述方位信息用于指示录制时所述音频信号在声场中的方位。
作为一种可选的实施方式，在本发明实施例第一方面中，所述识别所述汽车座椅上用户的人耳位置，包括：
控制摄像头拍摄包含位于所述汽车座椅上的用户人脸的面部图像，并根据所述面部图像识别所述用户的人耳位置。
本发明实施例第二方面公开一种音频***，包括：
多路扬声器，所述多路扬声器布置在汽车座椅的四周；
识别定位模块，用于识别所述汽车座椅上用户的人耳位置；
距离确定模块，用于根据所述人耳位置确定所述多路扬声器中每一路扬声器与所述人耳的相对距离；
音频处理模块，用于根据所述相对距离调整所述每一路扬声器播放的音频信号在频域上的幅度，以使所述每一路扬声器播放的音频信号在到达所述人耳时的音量相同。
作为一种可选的实施方式，在本发明实施例第二方面中，所述多路扬声器分别布置于以下位置：所述汽车的车门、前方中控台、顶棚、后置搁物板、地板以及所述汽车座椅。
作为一种可选的实施方式，在本发明实施例第二方面中，所述***还包括：
音频接收模块，用于接收多声道的音频信号输入；
方位识别模块，用于识别各个所述声道的音频信号在声场中的方位；
扬声器确定模块，用于确定布置位置与所述音频信号在声场中的方位对应的扬声器；
扬声器控制模块，用于控制与所述方位对应的扬声器播放所述音频信号。
作为一种可选的实施方式，在本发明实施例第二方面中，所述方位识别模块，用于识别各个所述声道的音频信号在声场中的方位的方式具体为：
所述方位识别模块，用于读取所述音频信号的编码中包含的方位信息，以获得各个所述声道的音频信号在声场中的方位，所述方位信息用于指示录制时所述音频信号在声场中的方位。
作为一种可选的实施方式，在本发明实施例第二方面中，所述识别定位模块，用于识别所述汽车座椅上用户的人耳位置，包括：
所述识别定位模块，用于控制摄像头拍摄包含位于所述汽车座椅上的用户人脸的面部图像，并根据所述面部图像识别所述用户的人耳位置。
本发明实施例第三方面公开一种音频***，包括：
存储有可执行程序代码的存储器；
与存储器耦合的中央微处理器；
多路扬声器、人脸定位模块、数字音频处理器、多路音频功率放大器606、电源管理模块；其中，多路扬声器布置在汽车座椅的四周；可选的，具体可以布置在汽车的车门、前方中控台、顶棚、后置搁物板、地板以及汽车座椅；中央微处理器调用存储器中存储的可执行程序代码，执行本发明实施例第一方面公开的任一项方法。
本发明第四方面公开一种计算机可读存储介质，其存储计算机程序，其中，所述计算机程序使得计算机执行本发明实施例第一方面公开的任一项方法。
本发明实施例第五方面公开一种计算机程序产品，当所述计算机程序产品在计算机上运行时，使得所述计算机执行本发明实施例第一方面公开的任一项方法。
与现有技术相比，本发明实施例具有以下有益效果：
本发明实施例在汽车座椅的四周布置多路扬声器，从而可以在用户坐上汽车座椅之后，通过环绕用户设置的多路扬声器产生立体的声场。此外，通过识别人耳的位置，可以确定出每一路扬声器与人耳位置之间的相对距离；根据各路扬声器与人耳位置之间的相对距离，调整扬声器播放音频信号时在频域上的幅度，以使各路扬声器播放的音频信号到达人耳时的音量相同。通过调整各路扬声器播放的音频信号在频域上的幅度，可以补偿声音在传输过程中由于距离而导致的衰减，减少音量差造成用户感受到的发声位置偏移，从而可以模拟出较为真实的声场效果，使得用户听到的声音更加立体饱满。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例公开的一种扬声器布局位置示例图；
图2是本发明实施例公开的另一种车内声场调节方法的流程示意图；
图3是本发明实施例公开的另一种车内声场调节方法的流程示意图；
图4是本发明实施例公开的一种音频***的结构示意图；
图5是本发明实施例公开的另一种音频***的结构示意图；
图6是本发明实施例公开的另一种音频***的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，本发明实施例及附图中的术语 “包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
本发明实施例公开了一种车内声场调节方法及音频***，能够达到环绕包围的立体声场效果。以下分别进行详细说明。
为了更好地理解本发明实施例公开的车内声场调节方法及音频***，下面首先对本发明实施例适用的扬声器布局进行介绍。本发明实施例公开的音频***包含多路扬声器，并布置在汽车座椅的四周，至少包括以汽车座椅为中心的前、后、左、右、上、下等六个方向；作为一种可选的实施方式，请参阅图1，图1是本发明实施例公开的一种扬声器布局位置示例图。如图1所示，扬声器可以分别布置在以下位置：汽车的车门、前方中控台、顶棚、后置搁物板、地板以及座椅上；具体地，座椅上的扬声器可以布置于座椅头枕。通过在以座椅为中心的各个方向布置扬声器，当用户坐上座椅之后，可以通过环绕用户设置的多个扬声器产生立体声场，尤其是设置在顶棚和地板的扬声器，可以营造出声源位于用户头顶和脚下的声场效果。本发明实施例公开的扬声器位置布局，可以为用户营造立体声场，相较于二维的平面声场，在立体声场中用户可以感受到360度环绕的声音效果，更加真实自然。
基于上述的扬声器位置布局，下面对本发明实施例公开的车内声场调节方法及音频***进行说明。
实施例一
请参阅图2，图2是本发明实施例公开的一种车内声场调节方法的流程示意图。其中，图2所描述的车内声场调节方法适用于车载影音娱乐***、车载音响***等音频***，本发明实施例不做限定。如图2所示，该车内声场调节方法可以包括以下步骤：
201、音频***识别汽车座椅上用户的人耳位置。
本发明实施例中，作为一种可选的实施方式，可以在用户进入汽车内乘坐时，控制摄像头拍摄包含位于汽车座椅上的用户人脸的面部图像，通过边缘检测、特征提取等图像处理方式从面部图像中识别出人耳在该面部图像中的位置；或者，将面部图像作为人耳识别模型的数据输入，人耳识别模型的输出即为人耳在该面部图像中的位置；其中，该人耳识别模型为采用大量标注有人耳的面部图像进行训练得到的深度神经网络。由于在车厢中，乘客的位置相对固定，因此，当摄像头在汽车内的放置位置已知时，可以根据人耳在面部图像中的位置计算出摄像头与人耳的相对位置，即可确定出人耳在汽车内的位置。
作为另一种可选的实施方式，还可以在用户进入汽车内乘坐时，通过超声波收发模块发射超声波，并接收超声波的反射波；通过分析反射波，可以在超声波的探测范围内识别出可能的人耳，并且确定出人耳的位置。
202、音频***根据人耳位置确定多路扬声器中每一路扬声器与人耳的相对距离。
本发明实施例中，根据前述的扬声器位置布局可知，每一路扬声器在汽车内的布局位置是固定且已知的；执行上述的步骤201，音频***可以确定人耳在汽车内的位置；根据每一路扬声器在汽车内的布局位置以及人耳在汽车内的位置，可以确定出每一路扬声器与人耳的相对距离。作为一种可选的实施方式，可以在汽车内建立一坐标系，该坐标系以汽车内的某一物体作为原点，在该坐标系下表示每一路扬声器在汽车内的位置以及人耳在汽车内的位置。
203、音频***根据上述的相对距离调整每一路扬声器播放的音频信号在频域上的幅度，以使每一路扬声器播放的音频信号在到达人耳时的音量相同。
本发明实施例中，当用户进入汽车内乘坐之后，结合图1所示的扬声器位置布局，可以看出各个扬声器与人耳位置的相对距离不同。举例来说，如果用户位于汽车的主驾驶位，布置在主驾驶一侧车门的扬声器与用户的相对距离小于布置在副驾驶一侧车门的扬声器与用户的相对距离，布置在前方中控台的扬声器与用户的相对距离小于布置在后侧搁物版的扬声器与用户的相对距离。由于声音在传播过程中会发生衰减，并且衰减的程度与距离相关，声音传播距离每增加一倍，听到的音量衰减6dB。如果不对音量衰减进行补偿，当使用音频***播放某一音频节目时，用户听到各路扬声器的播放的音频信号的音量各不相同，会影响用户的听觉感受，音频***还原的声场与录制该音频节目时的声场差距较大。继续以用户位于汽车的主驾驶位为例，假设用户使用音频***播放歌曲，如果不对音量衰减进行补偿，用户听到布置在主驾驶一侧车门的扬声器播放的音量较大，布置在副驾驶一侧车门的扬声器播放的音量较小，会使得用户产生歌手在其左侧发声的感觉，这样的声音效果不符合人的听音习惯。
因此，本发明实施例根据每一路扬声器与人耳之间的相对距离调整扬声器播放的音频信号在频域上的幅度，以使每一路扬声器播放的音频信号在到达人耳时的音量相同，从而可以减少传播距离导致的声音衰减，减少音量差造成用户感受到的发声位置偏移，为用户营造环绕包围的立体声场效果。
此外，作为一种可选的实施方式，音频***执行上述步骤203的方式具体可以为：
音频***从多路扬声器中确定出与人耳位置的相对距离最短的扬声器作为基准扬声器，并提高多路扬声器中除基准扬声器以外的其余扬声器在频域上的幅度。可选的，以基准扬声器播放的音频信号在频域上的幅度为基准幅度，以基准扬声器与人耳位置的相对距离为基准距离，对于多路扬声器中除基准扬声器以外的其余扬声器，该扬声器与人耳的相对距离每增加一个基准距离，该扬声器播放的音频信号在频域上的幅度在基准幅度的基础上增加指定数值。
作为另一种可选的实施方式，音频***执行上述步骤203的方式具体还可以为：
音频***从多路扬声器中确定出与人耳位置的相对距离最长的扬声器作为基准扬声器，降低多路扬声器中除基准扬声器以外的其余扬声器在频域上的幅度。可选的，以基准扬声器播放的音频信号在频域上的幅度为基准幅度，以距离最短的扬声器与人耳位置的相对距离为基准距离，对于多路扬声器中除基准扬声器以外的其余扬声器，该扬声器与人耳的相对距离每增加一个基准距离，该扬声器播放的音频信号在频域上的幅度在基准幅度的基础上减少指定数值。
可见，在图2所描述的方法中，音频***可以识别汽车座椅上用户的人耳位置，然后确定出各路扬声器与人耳位置之间的相对距离，从而根据相对距离对各路扬声器播放的音频信号进行补偿，从而使得各路扬声器播放的音频信号在到达人耳时的音量相同，可以减少传播距离导致的声音衰减，减少音量差造成用户感受到的发声位置偏移，为用户营造环绕包围的立体声场效果。
实施例二
请参阅图3，图3是本发明实施例公开的另一种车内声场调节方法的流程示意图。如图3所示，该车内声场调节方法可以包括以下步骤：
301、音频***识别汽车座椅上用户的人耳位置。
302、音频***根据人耳位置确定多路扬声器中每一路扬声器与人耳的相对距离。
本发明实施例中，上述的扬声器可以采用扬声器阵列，以提高每一路扬声器的指向性。
303、音频***接收多声道的音频信号输入，并识别各个声道的音频信号在声场中的方位。
本发明实施例中，音频信号的编码中可以包含方位信息，该方位信息用于指示录制时该音频信号在声场中的方位。用户在真实的环境中听到的声音来自各个方向，为了还原真实的声音环境，在录制音频节目时，可以采用不同的声道保存来自不同方向的声音，并且可以记录各个方向的声音相对于听众的声源方位，也即音频信号在声场中的方位。作为一种可选的实施方式，可以在编码时加入方位信息，相应的，在对音频信号进行解码时，可以读取编码中包含的方位信息，从而获得音频信号在声场中的方位。
304、音频***确定布置位置与音频信号在声场中的方位对应的扬声器。
305、音频***控制与音频信号在声场中的方位对应的扬声器播放音频信号，并且在播放音频信号时，根据上述的相对距离调整每一路扬声器播放的音频信号在频域上的幅度，以使每一路扬声器播放的音频信号在到达人耳时的音量相同。
本发明实施例中，在识别出各声道的音频信号在声场中的方位之后，控制布置位置与音频信号的方位对应的扬声器播放该音频信号，可以很好地还原音频节目录制时的声场。举例来说，某一音频节目中包含飞机引擎的轰鸣声，轰鸣声在声场中的方位为听众的头顶上方；在录制该音频节目时，一并将方位信息进行编码，而在播放时，通过读取编码识别轰鸣声对应的音频信号在声场中的方位为听众的头顶上方，那么可以控制布置在顶棚的扬声器播放飞机引擎的轰鸣声，为处于汽车内部的用户营造飞机从上方飞过的声音效果。
可见，在图3所描述的方法中，音频***可以根据扬声器与人耳位置之间的相对位置调整各个扬声器播放的音频信号在频域上的幅度，从而可以减少音量差造成用户感受到的发声位置偏移，为用户营造环绕包围的立体声场效果；进一步地，在图3所描述的方法中，音频***可以根据音频信号在声场中的方位控制相应的扬声器播放音频信号，从而可以还原录制时的声源位置，为用户提供真实的声场效果。
实施例三
请参阅图4，图4是本发明实施例公开的一种音频***的结构示意图。如图4所示，该音频***可以包括：
多路扬声器401，布置在汽车座椅的四周；可选的，可以具体布置在汽车的车门、前方中控台、顶棚、后置搁物板、地板以及汽车座椅；
识别定位模块402，用于识别汽车座椅上用户的人耳位置；
本发明实施例中，识别定位模块402可以控制摄像头拍摄包含位于汽车座椅上的用户人脸的面部图像，通过边缘检测、特征提取等图像处理方式从面部图像中识别出人耳在该面部图像中的位置；或者，将面部图像作为人耳识别模型的数据输入，人耳识别模型的输出即为人耳在该面部图像中的位置；其中，该人耳识别模型为采用大量标注有人耳的面部图像进行训练得到的深度神经网络；根据人耳在面部图像中的位置以及摄像头在汽车内部的放置位置，可以确定出人耳在汽车内的位置；
距离确定模块403，用于根据识别定位模块402识别的人耳位置确定多路扬声器中每一路扬声器与人耳的相对距离；
音频处理模块404，用于根据距离确定模块403确定的相对距离调整每一路扬声器播放的音频信号在频域上的幅度，以使每一路扬声器播放的音频信号在到达人耳时的音量相同；
本发明实施例中，音频处理模块404在调整音频信号在频域上的幅度之后，对调整后的音频信号进行功率放大，以驱动多路扬声器401中各路扬声器播放音频信号。
作为一种可选的实施方式，音频处理模块404可以从多路扬声器中确定出与人耳位置的相对距离最短的扬声器作为基准扬声器，并提高多路扬声器中除基准扬声器以外的其余扬声器在频域上的幅度；可选的，音频处理模块404以基准扬声器播放的音频信号在频域上的幅度为基准幅度，以基准扬声器与人耳位置的相对距离为基准距离，对于多路扬声器中除基准扬声器以外的其余扬声器，该扬声器与人耳的相对距离每增加一个基准距离，该扬声器播放的音频信号在频域上的幅度在基准幅度的基础上增加指定数值。
作为另一种可选的实施方式，音频处理模块404还可以从多路扬声器中确定出与人耳位置的相对距离最长的扬声器作为基准扬声器，降低多路扬声器中除基准扬声器以外的其余扬声器在频域上的幅度。可选的音频处理模块404以基准扬声器播放的音频信号在频域上的幅度为基准幅度，以距离最短的扬声器与人耳位置的相对距离为基准距离，对于多路扬声器中除基准扬声器以外的其余扬声器，该扬声器与人耳的相对距离每增加一个基准距离，该扬声器播放的音频信号在频域上的幅度在基准幅度的基础上减少指定数值。
可见，实施图4所示的音频***，可以识别汽车座椅上用户的人耳位置，然后确定出各路扬声器与人耳位置之间的相对距离，从而根据相对距离对各路扬声器播放的音频信号进行补偿，从而使得各路扬声器播放的音频信号在到达人耳时的音量相同，可以减少传播距离导致的声音衰减，减少音量差造成用户感受到的发声位置偏移，为用户营造环绕包围的立体声场效果。
实施例四
请参阅图5，图5是本发明实施例公开的一种音频***的结构示意图。其中，图5所示的音频***由图4所示的音频***进行优化得到的。如图5所示，该音频***还可以包括：
音频接收模块405，用于接收多声道的音频信号输入；
方位识别模块406，用于识别音频接收模块405接收到的各个声道的音频信号在声场中的方位；
本发明实施例中，方位识别模块406具体可以读取音频信号的编码中包含的方位信息，以获得各个声道的音频信号在声场中的方位；其中，上述的方位信息用于指示录制时音频信号在声场中的方位；
扬声器确定模块407，用于确定布置位置与方位识别模块406识别出的音频信号在声场中的方位对应的扬声器；
扬声器控制模块408，用于根据扬声器确定模块407的处理结果，控制多路扬声器401中与音频信号在声场中的方位对应的扬声器播放音频信号。此外，本发明实施例中，多路扬声器401中的扬声器可以采用扬声器阵列，以提高每一路扬声器的指向性。
可见，实施图5所示的音频***，扬声器播放的音频信号在声场中方位与该扬声器的布置位置相对应，并且各路扬声器播放的音频信号在到达人耳时的音量相同，从而可以还原录制时的声源位置，并且减少音量差造成用户感受到的发声位置偏移，可以为用户提供真实的声场效果。
实施例五
请参阅图6，图6是本发明实施例公开的一种音频***的结构示意图。如图6所示，该音频***可以包括：
存储有可执行程序代码的存储器601；
与存储器601耦合的中央微处理器（Micro Controller Unit，MCU）602；
多路扬声器603、人脸定位模块604、数字音频处理器（Digital Signal Processing，DSP）605、多路音频功率放大器606、电源管理模块607；
其中，多路扬声器603布置在汽车座椅的四周；可选的，具体可以布置在汽车的车门、前方中控台、顶棚、后置搁物板、地板以及汽车座椅；电源管理模块607为上述各个功能模块提供合适的电压与电流，以保证音频***的正常运作；中央微处理器601调用存储器602中存储的可执行程序代码，执行图1或图2所示的车内声场调节方法，具体可以控制各功能模块执行以下操作：
人脸定位模块604识别汽车座椅上用户的人耳位置；可选的，人脸定位模块604可以控制摄像头拍摄包含位于汽车座椅上的用户人脸的面部图像，并根据面部图像识别用户的人耳位置；中央微处理器602获取人脸定位模块604定位的人耳位置，并确定出多路扬声器603中每一路扬声器与人耳的相对距离；数字音频处理器605根据中央微处理器602确定出的相对距离，调整多路扬声器603中每一路扬声器播放的音频信号在频域上的幅度，通过多路音频功率放大器606对调整后的音频信号进行功率放大，以驱动多路扬声器603中的各路扬声器播放音频信号，并使得每一路扬声器播放的音频信号在到达人耳时的音量相同。
可选的，中央微处理器602还可以接收多声道的音频信号输入，并识别各个声道的音频信号在声场中的方位；具体的，可以通过读取音频信号的编码中包含的方位信息，以获得各个声道的音频信号在声场中的方位；上述的方位信息用于指示录制时音频信号在声场中的方位；进一步地，中央微处理器602可以确定出布置位置与音频信号在声场中的方位对应的扬声器；在多路音频功率放大器606对调整后的音频信号进行功率放大之后，驱动与音频信号在声场中的方位对应的扬声器播放音频信号。
本发明实施例公开一种计算机可读存储介质，其存储计算机程序，其中，该计算机程序使得计算机执行图1或图2所示的任一种车内声场调节方法。
本发明实施例公开一种计算机程序产品，该计算机程序产品包括存储了计算机程序的非瞬时性计算机可读存储介质，且该计算机程序可操作来使计算机执行图1或图2所示的任一种车内声场调节方法。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定特征、结构或特性可以以任意适合的方式结合在一个或多个实施例中。本领域技术人员也应该知悉，说明书中所描述的实施例均属于可选实施例，所涉及的动作和模块并不一定是本发明所必须的。
在本发明的各种实施例中，应理解，上述各过程的序号的大小并不意味着执行顺序的必然先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
上述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物单元，即可位于一个地方，或者也可以分布到多个网络单元上。可根据实际的需要选择其中的部分或全部单元来实现本实施例方案的目的。
另外，在本发明各实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
上述集成的单元若以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可获取的存储器中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或者部分，可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储器中，包括若干请求用以使得一台计算机设备（可以为个人计算机、服务器或者网络设备等，具体可以是计算机设备中的处理器）执行本发明的各个实施例上述方法的部分或全部步骤。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质包括只读存储器（Read-Only Memory，ROM）、随机存储器（Random Access Memory，RAM）、可编程只读存储器（Programmable Read-only Memory，PROM）、可擦除可编程只读存储器（Erasable Programmable Read Only Memory，EPROM）、一次可编程只读存储器（One-time Programmable Read-Only Memory，OTPROM）、电子抹除式可复写只读存储器（Electrically-Erasable Programmable Read-Only Memory，EEPROM）、只读光盘（Compact Disc Read-Only Memory，CD-ROM）或其他光盘存储器、磁盘存储器、磁带存储器、或者能够用于携带或存储数据的计算机可读的任何其他介质。
以上对本发明实施例公开的一种车内声场调节方法及音频***进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (10)

  1. 一种车内声场调节方法，其特征在于，所述方法应用于包含多路扬声器的音频***，所述多路扬声器布置在汽车座椅的四周；所述方法包括：
    识别所述汽车座椅上用户的人耳位置；
    根据所述人耳位置确定所述多路扬声器中每一路扬声器与所述人耳的相对距离；
    根据所述相对距离调整所述每一路扬声器播放的音频信号在频域上的幅度，以使所述每一路扬声器播放的音频信号在到达所述人耳时的音量相同。
  2. 根据权利要求1所述的车内声场调节方法，其特征在于，所述多路扬声器分别布置于以下位置：所述汽车的车门、前方中控台、顶棚、后置搁物板、地板以及所述汽车座椅。
  3. 根据权利要求2所述的车内声场调节方法，其特征在于，所述方法还包括：
    接收多声道的音频信号输入；
    识别各个所述声道的音频信号在声场中的方位；
    确定布置位置与所述音频信号在声场中的方位对应的扬声器；
    控制与所述方位对应的扬声器播放所述音频信号。
  4. 根据权利要求3所述的车内声场调节方法，其特征在于，所述识别各个所述声道的音频信号在声场中的方位，包括：
    读取所述音频信号的编码中包含的方位信息，以获得各个所述声道的音频信号在声场中的方位，所述方位信息用于指示录制时所述音频信号在声场中的方位。
  5. 根据权利要求1~4任一项所述的车内声场调节方法，其特征在于，所述识别所述汽车座椅上用户的人耳位置，包括：
    控制摄像头拍摄包含位于所述汽车座椅上的用户人脸的面部图像，并根据所述面部图像识别所述用户的人耳位置。
  6. 一种音频***，其特征在于，包括：
    多路扬声器，所述多路扬声器布置在汽车座椅的四周；
    识别定位模块，用于识别所述汽车座椅上用户的人耳位置；
    距离确定模块，用于根据所述人耳位置确定所述多路扬声器中每一路扬声器与所述人耳的相对距离；
    音频处理模块，用于根据所述相对距离调整所述每一路扬声器播放的音频信号在频域上的幅度，以使所述每一路扬声器播放的音频信号在到达所述人耳时的音量相同。
  7. 根据权利要求6所述的音频***，其特征在于，所述多路扬声器分别布置于以下位置：所述汽车的车门、前方中控台、顶棚、后置搁物板、地板以及所述汽车座椅。
  8. 根据权利要求7所述的音频***，其特征在于，所述***还包括：
    音频接收模块，用于接收多声道的音频信号输入；
    方位识别模块，用于识别各个所述声道的音频信号在声场中的方位；
    扬声器确定模块，用于确定布置位置与所述音频信号在声场中的方位对应的扬声器；
    扬声器控制模块，用于控制与所述方位对应的扬声器播放所述音频信号。
  9. 根据权利要求8所述的音频***，其特征在于，所述方位识别模块，用于识别各个所述声道的音频信号在声场中的方位的方式具体为：
    所述方位识别模块，用于读取所述音频信号的编码中包含的方位信息，以获得各个所述声道的音频信号在声场中的方位，所述方位信息用于指示录制时所述音频信号在声场中的方位。
  10. 根据权利要求6~9任一项所述的音频***，其特征在于，所述识别定位模块，用于识别所述汽车座椅上用户的人耳位置，包括：
    所述识别定位模块，用于控制摄像头拍摄包含位于所述汽车座椅上的用户人脸的面部图像，并根据所述面部图像识别所述用户的人耳位置。
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