WO2024050880A1 - 一种音频播放方法、车载音响系统及存储介质 - Google Patents

一种音频播放方法、车载音响系统及存储介质 Download PDF

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Publication number
WO2024050880A1
WO2024050880A1 PCT/CN2022/120940 CN2022120940W WO2024050880A1 WO 2024050880 A1 WO2024050880 A1 WO 2024050880A1 CN 2022120940 W CN2022120940 W CN 2022120940W WO 2024050880 A1 WO2024050880 A1 WO 2024050880A1
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audio
module
speaker
source signals
sub
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PCT/CN2022/120940
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English (en)
French (fr)
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孙舒远
孟义明
张欣
尹昊
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瑞声科技（南京）有限公司
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Priority to US18/091,420 priority Critical patent/US20240098414A1/en
Publication of WO2024050880A1 publication Critical patent/WO2024050880A1/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • 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
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/11—Positioning of individual sound objects, e.g. moving airplane, within a sound field

Definitions

  • the present application relates to the technical field of audio signal processing and application, and in particular to an audio playback method, a vehicle audio system and a storage medium.
  • the car audio system provides users with an excellent and immersive driving experience by playing audio in the car cockpit. Judging from the development history of the number of speakers in car audio systems, in the era of fuel vehicles, the car audio system included at least four speakers, but in the current era of smart cockpits, car audio systems usually are equipped with more than twenty speakers. It is difficult to see that users’ pursuit of sound has evolved from the initial simple improvement of sound quality to today’s desire for sound field sound effects. Therefore, under the multi-speaker architecture of the car audio system, a better and more immersive surround sound experience has become particularly important. important.
  • the purpose of this application is to provide an audio playback method, a vehicle audio system and a storage medium, aiming to solve the problem in related technologies that the overall acoustic experience of the vehicle audio system is poor.
  • the first aspect of the embodiment of the present application provides an audio playback method, which is applied to a vehicle audio system.
  • the vehicle audio system includes multiple speaker modules arranged at different positions in the car cabin;
  • the audio playback method includes:
  • each audio source signal includes multiple sub-audio source signals of the same category;
  • each sub-source signal is played through the corresponding speaker module.
  • the second aspect of the embodiment of the present application provides a vehicle audio system, including a control and processing module disposed in a car cabin, and multiple speaker modules connected to the control and processing module, wherein the multiple speakers The modules are located at different locations in the car cabin, and the control and processing modules are used to execute the audio playback method described in the first aspect of the embodiment of the present application.
  • the third aspect of the embodiment of the present application provides a computer-readable storage medium on which executable instructions are stored.
  • the executable instruction is executed, the audio playback method described in the first aspect of the embodiment of the present application is executed.
  • the beneficial effects of this application are: first, obtaining the audio signal to be played; second, decomposing the audio signal to obtain multiple sound source signals of different categories (such as string sound signals) ), where each sound source signal includes multiple sub-sound source signals of the same category (for example, the string sound signal includes erhu sound signal, violin sound signal, cello sound signal, etc.); after that, all sub-sound source signals are established according to the preset allocation principle. Routing between the audio source signal and multiple speaker modules, in which the preset distribution principle indicates the rules for different sub-audio source signals to be played through different speaker modules; finally, according to the routing, each sub-audio source signal is routed through the corresponding The speaker module plays.
  • the preset distribution principle indicates the rules for different sub-audio source signals to be played through different speaker modules
  • this application decomposes the input audio signal into multiple audio source signals of different categories according to the category of the audio source (each audio source signal includes multiple sub-audio source signals under the same category), and uses the preset allocation principle as a reference to Different sub-sound source signals are played through speaker modules located at different locations in the car cabin, thus providing a more accurate and immersive car multi-channel surround sound playback (playback refers to the different sub-sound source signals passing through different speaker module for playback), which can effectively improve the overall acoustic experience of the car audio system.
  • Figure 1 is a schematic flow chart of an audio playback method provided by an embodiment of the present application.
  • Figure 2 is a module block diagram of a vehicle audio system provided by an embodiment of the present application.
  • Figure 3 is an example diagram of a vehicle audio system provided by an embodiment of the present application.
  • Figure 4 is a module block diagram of a computer-readable storage medium provided by an embodiment of the present application.
  • Figure 1 is a schematic flow chart of an audio playback method provided by an embodiment of the present application.
  • the audio playback method is applied to a vehicle audio system including multiple speaker modules disposed at different positions in the car cabin.
  • the audio playback method includes the following steps 101 to 104.
  • Step 101 Obtain the audio signal to be played.
  • the corresponding sound source of the obtained audio signal can be but is not limited to a monophonic sound source, a two-channel sound source, and a multi-channel sound source.
  • channel audio source and it can come from a vehicle host or user terminals such as mobile phones and tablet computers.
  • Step 102 Decompose the audio signal to obtain multiple audio source signals of different categories.
  • the audio signal after obtaining the audio signal to be played, the audio signal needs to be decomposed according to the type of the sound source to obtain multiple sound source signals of different categories; wherein each sound source signal includes multiple sound source signals of the same category.
  • Sub-source signal may be a single-track or multi-track audio source signal that is pre-configured in the corresponding audio source of the audio signal, including but not limited to left channel audio track, right channel audio track, center channel audio track and Surround channel audio track; the audio source signal may also be a single-track or multi-track audio source signal separated and extracted from the audio signal in step 102, including but not limited to human voice source signal, instrument sound source signal and background environment sound source signal.
  • the audio signal may have one channel or multiple channels.
  • the decomposition result of the audio signal in step 102 is to obtain multiple sound source signals of different categories under all channels, Assuming that the audio signal is two-channel, the decomposition result of the audio signal in step 102 is to obtain multiple audio source signals of different categories under the left channel, and multiple audio source signals of different categories under the right channel.
  • Step 103 Establish routing between all sub-sound source signals and multiple speaker modules according to the preset distribution principle.
  • the correlation between sub-sound source signals of the same category can be obtained among all channels, and the frequencies of all sub-sound source signals can be obtained, and then the obtained correlation and frequency can be used as a reference.
  • establishing routing between all sub-source signals and multiple speaker modules according to the preset distribution principle which will be demonstrated in detail in the examples given below.
  • Step 104 Play each sub-sound source signal through the corresponding speaker module according to the routing.
  • each sub-sound source signal needs to be played through the corresponding speaker module according to the established route.
  • the embodiment of the present application decomposes the input audio signal into multiple audio source signals of different categories according to the type of audio source (each audio source signal includes multiple sub-audio source signals under the same category), and uses the preset allocation principle as For reference, different sub-sound source signals are played through speaker modules located at different locations in the car cabin, thereby providing a more accurate and immersive car multi-channel surround sound playback (reproduction refers to different sub-sound source signals Playing through different speaker modules) can effectively improve the overall acoustic experience of the car audio system.
  • Figure 2 is a module block diagram of a vehicle audio system provided by an embodiment of the present application.
  • an embodiment of the present application also provides a vehicle audio system.
  • the vehicle audio system includes a control and processing module disposed in the vehicle cabin and a plurality of speaker modules connected to the control and processing module. , wherein multiple speaker modules are located at different positions in the car cabin, and the control and processing module is used to execute the aforementioned audio playback method provided by the embodiment of the present application.
  • the multiple speaker modules may be of various types, such as a subwoofer speaker module, a bass speaker module, a mid-range and high-pitched speaker module, etc.; the speaker module may include a speaker. Multiple speakers may be included, and the description below will include one speaker.
  • control and processing module includes an arithmetic processing module 27 , a storage module 28 , an audio bus 26 , a digital-to-analog conversion module (not shown in the figure), a power amplification module 30 and a power management module 29 .
  • the audio bus 26 is used to transmit the audio signal to be played to the arithmetic processing module 27;
  • the storage module 28 is used to store at least one program, and when at least one program is executed by the arithmetic processing module 27, the arithmetic processing module 27 executes the process.
  • the digital-to-analog conversion module is used to convert the digital signal output by the operation processing module 27 into an analog signal
  • the power amplification module 30 is used to power amplify the analog signal output by the digital-to-analog conversion module for transmission. to multiple speakers
  • the power management module 29 is used to manage the power supply of the computing processing module 27, the storage module 28, the digital-to-analog conversion module, the power amplifier module 30, and multiple speaker modules.
  • the power amplifier module 30 has multiple input interfaces and multiple output interfaces.
  • One input interface and one output interface constitute a transmission channel.
  • the number of transmission channels is the same as the number of speakers. The purpose of this design is to facilitate the amplification of the power.
  • Each sub-source signal is transmitted to the corresponding speaker for playback.
  • Speaker 1 is located on the car's center console
  • speakers 2 and 3 are located on the left and right sides of the car's center console
  • speakers 4 to 11 are located at the right front door, left front door, right rear door, and left rear door of the car
  • speakers 12 to 19 are located at the driver's seat
  • the speakers 20 to 23 are located at the front right, front left, rear right, and rear left positions of the car roof at the headrest positions of the passenger seat, the right rear seat, and the left rear seat
  • the speaker 24 is located in the trunk of the car.
  • speakers 5, 9, 7, and 11 are woofer speakers for reproducing sounds below 180Hz.
  • Speaker 24 is a subwoofer for reproducing sounds below 60Hz.
  • the remaining speakers are mid-range and tweeter speakers for reproducing sounds. Sound above 180Hz.
  • the speakers 1 to 24 are connected to the control and processing module 25 through audio wiring harnesses.
  • the control and processing module 25 obtains the original audio signal (i.e., the audio signal to be played) through the audio bus 26.
  • the original audio signal i.e., the audio signal to be played
  • the original audio signal can be expressed as the left channel is L(t) and The right channel is R(t).
  • the left channel as L(t) and the right channel as R(t) can be expressed in the following form:
  • the original audio signal is decomposed into 6 different audio content objects, including human voice, wind music (bamboo flute, brass, etc.), plucked music (pipa, guitar, etc.), string string sounds (Erhu, violin, cello, etc.), percussion sounds (drums, bells, large and small gongs, etc.), background sounds (wind, applause, rain, etc.) can also be decomposed according to product design needs, and are not limited here.
  • wind pipe music as an example, its corresponding sub-sound source signals are signals from bamboo flutes, brass pipes, etc.
  • the distribution principle on the one hand, must basically follow the basic characteristics of the human ear's subjective perception of spatial audio in multiple directions and angles, so as to avoid violating the common sense of human hearing and causing bad hearing sensations. On the other hand, it must be done according to the design requirements defined by the product. A certain degree of adaptation optimization.
  • the audio content objects decomposed from the original sound source first analyze the audio content objects with high correlation between elements of the same category in the original left and right channel sound sources. For example, calculate the human voice category objects in the original left and right channel sound sources. Relevance rsq vocal :
  • RSQ[] represents the calculation of the square value of the Pearson product moment correlation coefficient between two variables.
  • rsq ⁇ 0.8 it can be considered that there is a high correlation between the two; when rsq ⁇ 0.8, it can be considered that the two variables have a high correlation. There is a low correlation between them.
  • L rsq ⁇ 0.8 (t) represents the part of the left channel audio that has a higher correlation with the right channel
  • L rsq ⁇ 0.8 (t) represents the part of the left channel audio with a lower correlation with the right channel.
  • the audio content object of the left channel sound source of the original audio signal can be decomposed and written in the following form:
  • the frequency components of the audio content objects should also be considered to adapt to different woofer, midrange, and tweeter, such as a percussion class object in the left channel sound source , including sound content elements such as drums, bells, large and small gongs, etc. It is obvious that the frequency of drums is lower, while the frequency of bells is higher. These two sound content objects should be supplied to the woofer and mid-tweeter respectively. Perform sound playback.
  • the frequency component analysis of the audio content object can be as follows, for example, the part of the percussion category object of the left channel sound source that has a greater correlation between the left and right channels Perform frequency component analysis:
  • FFT[] is the fast Fourier transform, which is a basic digital signal processing method that converts time domain signals into frequency domain signals.
  • f drums represents the transformed frequency component
  • amp drums represents the transformed amplitude.
  • all audio content objects are divided into three frequency ranges for processing, namely ⁇ 60Hz, 60Hz ⁇ 180Hz, and >180Hz. It should be noted that audio content objects are divided into several frequency domain ranges for processing, and design changes can also be made according to the vehicle speaker architecture. For example, if the vehicle speaker architecture contains a separate channel for driving tweeters with operating frequency bands above 2000Hz , then the audio content object should also distinguish between parts less than 2000Hz and parts greater than 2000Hz.
  • the operation processing module 27 allocates different audio content objects to the input terminals of different power amplification modules, then:
  • the input terminal of the power amplifier module corresponding to speaker 1 is the input terminal of the power amplifier module corresponding to speaker 1:
  • the input terminal of the power amplifier module corresponding to speaker 2 is the input terminal of the power amplifier module corresponding to speaker 2:
  • the input terminal of the power amplifier module corresponding to speaker 3 is the input terminal of the power amplifier module corresponding to speaker 3:
  • the input terminal of the power amplifier module corresponding to speaker 4 is the input terminal of the power amplifier module corresponding to speaker 4:
  • the input terminal of the power amplifier module corresponding to speaker 5 is the input terminal of the power amplifier module corresponding to speaker 5:
  • f ⁇ [60Hz, 180Hz] represents all audio content objects with frequency components between 60Hz and 180Hz in the original right channel sound source.
  • the input terminal of the power amplifier module corresponding to speaker 6 is the input terminal of the power amplifier module corresponding to speaker 6:
  • the input terminal of the power amplifier module corresponding to speaker 7 is the input terminal of the power amplifier module corresponding to speaker 7:
  • f ⁇ [60Hz, 180Hz] represents all audio content objects with frequency components between 60Hz and 180Hz in the original left channel sound source.
  • the input terminal of the power amplifier module corresponding to speaker 8 is the input terminal of the power amplifier module corresponding to speaker 8:
  • the input terminal of the power amplifier module corresponding to speaker 9 is the input terminal of the power amplifier module corresponding to speaker 9:
  • f ⁇ [60Hz, 180Hz] represents all audio content objects with frequency components between 60Hz and 180Hz in the original right channel sound source.
  • the input terminal of the power amplifier module corresponding to the speaker 10 is the input terminal of the power amplifier module corresponding to the speaker 10:
  • the input terminal of the power amplifier module corresponding to speaker 11 is the input terminal of the power amplifier module corresponding to speaker 11:
  • f ⁇ [60Hz, 180Hz] represents all audio content objects with frequency components between 60Hz and 180Hz in the original left channel sound source.
  • the input terminal of the power amplifier module corresponding to speaker 12 is the input terminal of the power amplifier module corresponding to speaker 12:
  • the input terminal of the power amplifier module corresponding to speaker 13 is the input terminal of the power amplifier module corresponding to speaker 13:
  • the input terminal of the power amplifier module corresponding to the speaker 14 is the input terminal of the power amplifier module corresponding to the speaker 14:
  • the input terminal of the power amplifier module corresponding to speaker 15 is the input terminal of the power amplifier module corresponding to speaker 15:
  • the input terminal of the power amplifier module corresponding to the speaker 16 is the input terminal of the power amplifier module corresponding to the speaker 16:
  • the input terminal of the power amplifier module corresponding to speaker 17 is the input terminal of the power amplifier module corresponding to speaker 17:
  • the input terminal of the power amplifier module corresponding to speaker 18 is the input terminal of the power amplifier module corresponding to speaker 18:
  • the input terminal of the power amplifier module corresponding to speaker 19 is the input terminal of the power amplifier module corresponding to speaker 19:
  • the input terminal of the power amplifier module corresponding to the speaker 20 is the input terminal of the power amplifier module corresponding to the speaker 20:
  • the input terminal of the power amplifier module corresponding to the speaker 21 is the input terminal of the power amplifier module corresponding to the speaker 21:
  • the input terminal of the power amplifier module corresponding to the speaker 22 is the input terminal of the power amplifier module corresponding to the speaker 22:
  • the input terminal of the power amplifier module corresponding to the speaker 23 is the input terminal of the power amplifier module corresponding to the speaker 23:
  • the input terminal of the power amplifier module corresponding to the speaker 24 is the input terminal of the power amplifier module corresponding to the speaker 24:
  • f ⁇ 60Hz respectively represent all audio content objects with frequency components below 60Hz in the original left and right channel sound sources.
  • the operation processing module 27 After the routing of the audio content object is completed, some other digital signal processing can be performed in the operation processing module 27, including but not limited to delay adjustment, gain adjustment, phase adjustment, equalization adjustment, etc. After the processing is completed, it goes through digital-to-analog conversion and power amplification, and then goes to the corresponding speaker channel for sound reproduction. This part of the work is performed in the power amplification module 30.
  • Figure 4 is a module block diagram of a computer-readable storage medium provided by an embodiment of the present application.
  • this embodiment of the present application also provides a computer-readable storage medium 400.
  • the computer-readable storage medium 400 stores executable instructions 410.
  • the embodiment of the present application is executed. Provided audio playback methods.
  • RAM random access memory
  • ROM read-only memory
  • electrically programmable ROM electrically erasable programmable ROM
  • registers hard disks, removable disks, CD-ROMs, or anywhere in the field of technology. any other known form of storage media.
  • a computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., computer instructions may be transmitted from a website, computer, server or data center via a wired link (e.g.
  • Coaxial cable, optical fiber, digital subscriber line) or wireless means to transmit to another website, computer, server or data center.
  • Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or other integrated media that contains one or more available media. Available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), etc.

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Abstract

一种音频播放方法、车载音响系统及存储介质。音频播放方法应用于车载音响系统(包括设置于汽车座舱内不同位置的多个扬声模组)，且包括：获取待播放的音频信号(S101)；对音频信号进行分解以得到不同类别的多个音源信号(每个音源信号均包括同类别下的多个子音源信号)(S102)；根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由(S103)；根据路由将各子音源信号均通过相应的扬声模组播放(S104)。提供了更精准、更沉浸的车载多声道环绕声重放，能够有效地提升车载音响系统整体的声学体验效果。

Description

一种音频播放方法、车载音响系统及存储介质 技术领域
本申请涉及音频信号的处理与应用技术领域，尤其涉及一种音频播放方法、车载音响系统及存储介质。
背景技术
车载音响系统作为车载娱乐设施的重要组成部分，其通过在汽车座舱内播放音频的方式为用户带来优秀的、沉浸式的驾驶体验。从车载音响系统中扬声器数量的发展历程来看，在燃油车时代车载音响系统至少包括四个扬声器，而发展到现如今的智能座舱时代车载音响系统通常会配置二十多个扬声器，由此不难看出，用户对声音的追求已经从最初单纯的音质提升演变到现如今对声场音效的渴望，那么在车载音响系统的多扬声器架构下，更好的、更沉浸的环绕声体验就变得尤为重要。
相关技术中，车载主机、用户终端等大都只能提供双声道的音源，这就导致对于环绕声的处理车载音响系统只能通过对双声道的音源进行简单的上混和扬声器路由实现，当然小部分高端或旗舰级汽车可能还会通过一些双耳串扰消除的音效处理来增加环绕感，但不管是将双声道的音源进行简单的上混和扬声器路由，还是通过双耳串扰消除的音效处理来增加环绕感，都不能很好地营造出优秀的环绕声体验，甚至还可能对音质造成不利的影响，从而导致车载音响系统整体的声学体验效果不佳。
因此，有必要对上述车载音响系统播放音频的方式进行改进。
技术问题
本申请的目的在于提供一种音频播放方法、车载音响系统及存储介质，旨在解决相关技术中车载音响系统整体的声学体验效果较差的问题。
技术解决方案
为了解决上述技术问题，本申请实施例第一方面提供了一种音频播放方法，应用于车载音响系统，车载音响系统包括设置于汽车座舱内不同位置的多个扬声模组；
所述音频播放方法包括：
获取待播放的音频信号；
对音频信号进行分解以得到不同类别的多个音源信号；其中，每个音源信号均包括同类别下的多个子音源信号；
根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由；其中，预设分配原则指示不同的子音源信号通过不同的扬声模组进行播放的规则；
根据路由将各子音源信号均通过相应的扬声模组播放。
本申请实施例第二方面提供了一种车载音响系统，包括设置于汽车座舱内的控制与处理模组，以及与控制与处理模组连接的多个扬声模组，其中，多个扬声模组分别位于汽车座舱内的不同位置，控制与处理模组用于执行本申请实施例第一方面所述的音频播放方法。
本申请实施例第三方面提供了一种计算机可读存储介质，其上存储有可执行指令，该可执行指令被执行时执行本申请实施例第一方面所述的音频播放方法。
有益效果
从上述描述可知，与相关技术相比，本申请的有益效果在于：首先，获取待播放的音频信号；其次，对音频信号进行分解以得 到不同类别的多个音源信号(比如拉弦乐声信号)，其中，每个音源信号均包括同类别下的多个子音源信号(比如拉弦乐声信号包括二胡声信号、小提琴声信号和大提琴声信号等)；之后，根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由，其中，预设分配原则指示不同的子音源信号通过不同的扬声模组进行播放的规则；最后，根据路由将各子音源信号均通过相应的扬声模组播放。由此可见，本申请按照音源的类别将输入的音频信号分解为了不同类别的多个音源信号(每个音源信号都包括同类别下的多个子音源信号)，并且以预设分配原则为参考将不同的子音源信号通过位于汽车座舱内不同位置的扬声模组进行播放，从而提供了更精准、更沉浸的车载多声道环绕声重放(重放指的是不同的子音源信号通过不同的扬声模组进行播放)，能够有效地提升车载音响系统整体的声学体验效果。
附图说明
为了更清楚地说明相关技术或本申请实施例中的技术方案，下面将对相关技术或本申请实施例的描述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申请的一些实施例，而并非是全部实施例，对于本领域的普通技术人员来讲，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为本申请实施例提供的音频播放方法的流程示意图；
图2为本申请实施例提供的车载音响系统的模块框图；
图3为本申请实施例提供的车载音响系统的实例图；
图4为本申请实施例提供的计算机可读存储介质的模块框图。
本发明的实施方式
为了使本申请的目的、技术方案及优点更加的明显、易懂，下面将结合本申请实施例及其附图，对本申请进行清楚、完整地描述，其中，自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。应当理解的是，下面所描述的本申请的各个实施例仅仅用以解释本申请，并不用于限定本申请，也即基于本申请的各个实施例，本领域的普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例都属于本申请保护的范围。此外，下面所描述的本申请的各个实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互组合。
请参阅图1，图1为本申请实施例提供的音频播放方法的流程示意图，该音频播放方法应用于包括设置于汽车座舱内不同位置的多个扬声模组的车载音响系统，该音频播放方法包括如下步骤101至104。
步骤101、获取待播放的音频信号。
在本申请实施例中，通过车载音响系统进行音频播放时，需要先获取待播放的音频信号，所获取的音频信号相应的音源可以是但不限于单声道音源、双声道音源和多声道音源，并且其可以来自于车载主机或诸如手机及平板电脑等用户终端。
步骤102、对音频信号进行分解以得到不同类别的多个音源信号。
在本申请实施例中，获取到待播放的音频信号之后，还需要根据 音源的类型对音频信号进行分解以得到不同类别的多个音源信号；其中，每个音源信号均包括同类别下的多个子音源信号。需要说明的是，音源信号可以是预先在音频信号相应的音源中配置好的单轨或多轨音源信号，包括但不限于左声道音轨、右声道音轨、中置声道音轨和环绕声道音轨；音源信号也可以是通过步骤102从音频信号中分离提取出的单轨或多轨音源信号，包括但不限于人声音源信号、乐器声音源信号和背景环境声音源信号。
此外，音频信号可以具有一个声道也可以具有多个声道，当音频信号具有多个声道时，步骤102对音频信号的分解结果是得到所有声道下的不同类别的多个音源信号，假设音频信号为双声道，那么步骤102对音频信号的分解结果就是得到左声道下的不同类别的多个音源信号，以及右声道下的不同类别的多个音源信号。
步骤103、根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由。
在本申请实施例中，从音频信号中分离提取出不同类别的多个音源信号之后，还需要根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由；其中，预设分配原则指示不同的子音源信号通过不同的扬声模组进行播放的规则。
具体地，在执行步骤103时，可以在所有声道之间获取同类别的子音源信号之间的相关性，以及获取所有子音源信号的频率，之后再以所获取的相关性和频率为参考，根据预设分配原则建立所有子音源信号与多个扬声模组之间的路由，这将在下文所给出的实例中进行详 尽的体现。
步骤104、根据路由将各子音源信号均通过相应的扬声模组播放。
在本申请实施例中，建立好所有子音源信号与多个扬声模组之间的路由之后，还需要根据所建立的路由将每个子音源信号均通过相应的扬声模组进行播放。
由上可见，本申请实施例按照音源的类别将输入的音频信号分解为了不同类别的多个音源信号(每个音源信号都包括同类别下的多个子音源信号)，并且以预设分配原则为参考将不同的子音源信号通过位于汽车座舱内不同位置的扬声模组进行播放，从而提供了更精准、更沉浸的车载多声道环绕声重放(重放指的是不同的子音源信号通过不同的扬声模组进行播放)，能够有效地提升车载音响系统整体的声学体验效果。
请参阅图2，图2为本申请实施例提供的车载音响系统的模块框图。
如图2所示，本申请实施例还提供了一种车载音响系统，该车载音响系统包括设置于汽车座舱内的控制与处理模组及与控制与处理模组连接的多个扬声模组，其中，多个扬声模组分别位于汽车座舱内的不同位置，控制与处理模组用于执行本申请实施例提供的前述音频播放方法。在本申请实施例中，多个扬声模组可以具有多种类型，比如超低音扬声模组、低音扬声模组和中高音扬声模组等；扬声模组可以包括一个扬声器也可以包括多个扬声器，下文将以包括一个扬声器的形式进行说明。
具体地，控制与处理模组包括运算处理模块27、存储模块28、音频总线26、数模转换模块(图中未示出)、功率放大模块30以及电源管理模块29。其中，音频总线26用于将待播放的音频信号传输至运算处理模块27；存储模块28用于存储至少一个程序，且当至少一个程序被运算处理模块27执行时，使得运算处理模块27执行本申请实施例提供的前述音频播放方法；数模转换模块用于将运算处理模块27输出的数字信号转换为模拟信号；功率放大模块30用于将数模转换模块输出的模拟信号进行功率放大以传输至多个扬声器；电源管理模块29用于进行运算处理模块27、存储模块28、数模转换模块、功率放大模块30及多个扬声模组的供电管理。
具体地，功率放大模块30具有多个输入接口与多个输出接口，一个输入接口与一个输出接口构成一个传输通道，传输通道的数量与扬声器的数量相同，如此设计的目的在于方便将功率放大后的每个子音源信号均传输至相应的扬声器进行播放。
为了更加清楚地理解本申请实施例提供的车载音响系统及其音频播放方法，下面将以图3所示出的24通道(意为包括24个扬声器)车载音响系统为例，对本申请实施例提供的车载音响系统及其音频播放方法进行详细地说明。
扬声器1位于汽车中置台上，扬声器2，3位于汽车中置台左右侧的位置，扬声器4～11位于汽车右前门、左前门、右后门、左后门的位置，扬声器12～19位于汽车主驾驶、副驾驶、后排右侧座位、后排左侧座位的头枕位置，扬声器20～23位于汽车顶棚右前、左前、右 后、左后的位置，扬声器24位于汽车后备箱位置。其中扬声器5、9、7、11为低音扬声器，用于重放180Hz以下的声音，扬声器24为超低音扬声器，用于重放60Hz以下的声音，其余的扬声器为中高音扬声器，用于重放180Hz以上的声音。扬声器1～24通过音频线束接入到控制与处理模组25中。
控制与处理模组25通过音频总线26获取原始音频信号(即待播放的音频信号)，以原始音频信号为双声道为例，原始音频信号分别可表示为左声道为L(t)和右声道为R(t)。通过对原始音频信号的音频内容对象(即音源信号)分解，可以将左声道为L(t)和右声道为R(t)表示为如下形式：
Figure PCTCN2022120940-appb-000001
Figure PCTCN2022120940-appb-000002
其中，
Figure PCTCN2022120940-appb-000003
等表示原始音源中不同类别的音频内容对象，A L、B L、C L、A R、B R、C R等表示不同音频内容对象中所包含的元素(即子音源信号)个数。本申请实施例中，将原始音频信号分解为6种不同的音频内容对象，包括人声、吹管乐声(竹笛、铜管等)、弹拨乐声(琵琶、吉他等)、拉弦乐声(二胡、小提琴、大提琴等)、打击乐声(鼓声、碰铃、大小锣等)、背景声(风声、掌声、雨声等)，也可以按照产品设计需求进行分解，这里不做限定。以吹管乐声为例，其相应的子音源信号即为竹笛、铜管等的信号。
则原始音频信号可以写成：
Figure PCTCN2022120940-appb-000004
Figure PCTCN2022120940-appb-000005
其中，
Figure PCTCN2022120940-appb-000006
表示分别从左右声道原始音源中分离出来的人声内容对象；
Figure PCTCN2022120940-appb-000007
表示分别从左右声道原始音源中分离出来的吹管乐声内容对象；
Figure PCTCN2022120940-appb-000008
表示分别从左右声道原始音源中分离出来的弹拨乐声内容对象；
Figure PCTCN2022120940-appb-000009
表示分别从左右声道原始音源中分离出来的打击乐声内容对象；
Figure PCTCN2022120940-appb-000010
Figure PCTCN2022120940-appb-000011
表示分别从左右声道原始音源中分离出来的拉弦乐声内容对象；
Figure PCTCN2022120940-appb-000012
表示分别从左右声道原始音源中分离出来的背景声内容对象。
对原始音源进行音频内容对象内容分解完成后，就需要对各个音频内容对象进行内容分析，根据一定的分配原则，将不同的音频内容对象路由到不同的功率放大模块的输入端，这部分的处理工作是在运算处理模块27中完成的。分配原则，一方面要基本遵循人耳对空间音频多方位、多角度的主观感知的基本特性，避免违背人耳的听觉常识而造成不良的听感，另一方面需要根据产品定义的设计要求做一定程度的适配优化。
对从原始音源中分解出的音频内容对象，先分析出原始左右声道 音源中，同类别元素之间相关性较高的音频内容对象，例如计算左右声道原始音源中，人声类别对象的相关性rsq vocal：
Figure PCTCN2022120940-appb-000013
其中，RSQ[]表示两个变量之间的皮尔逊乘积矩相关系数平方值计算，当rsq≥0.8时，可以认为两者之间具有较高的相关性；当rsq<0.8时，可以认为两者之间具有较低的相关性。由此，就可以将原始音频信号的左声道音源的音频内容对象分解，写成如下形式：
L(t)＝L rsq≥0.8(t)+L rsq＜0.8(t)
L rsq≥0.8(t)表示左声道音频中与右声道相关性较高的部分，L rsq＜0.8(t)表示左声道音频中与右声道相关性较低的部分，分别可以写成：
Figure PCTCN2022120940-appb-000014
Figure PCTCN2022120940-appb-000015
同理，可以将原始音频信号的左声道音源的音频内容对象分解，写成如下形式：
R(t)＝R rsq≥0.8(t)+R rsq＜0.8(t)
其中，
Figure PCTCN2022120940-appb-000016
Figure PCTCN2022120940-appb-000017
对从原始音源中分解出的音频内容对象，分析出原始左右声道音源中，同类别元素之间相关性较高的音频内容对象后，还应考虑音频内容对象的频率成分，以适配不同的低音扬声器、中音扬声器和高音扬声器，例如在左声道音源的打击乐类别对象
Figure PCTCN2022120940-appb-000018
中，包含了鼓声、碰铃、大小锣等声音内容元素，很显然鼓声的频率较低，而碰铃的频率较高，这两种声音内容对象应该分别聩给低音扬声器和中高音扬声器进行声音重放。
对音频内容对象的频率成分分析，可如下，例如对左声道音源的打击乐类别对象中左右声道相关性较大的部分
Figure PCTCN2022120940-appb-000019
进行频率成分分析：
Figure PCTCN2022120940-appb-000020
其中，FFT[]为快速傅里叶变换，是将时域信号转换为频域信号 的一种基本数字信号处理方法，f drums表示变换后的频率成分，amp drums表示变换后的幅值。
本申请实施例中，将所有音频内容对象分为三个频率范围处理，分别为<60Hz、60Hz～180Hz、>180Hz。需要说明的是，将音频内容对象分为几种频域范围进行处理，也可以按照车载扬声器架构进行设计更改，例如如果车载扬声器架构中包含单独的通道用于驱动工作频段在2000Hz以上的高音单元，那音频内容对象也应当区分小于2000Hz的部分和大于2000Hz的部分。
则
Figure PCTCN2022120940-appb-000021
可以写成：
Figure PCTCN2022120940-appb-000022
完成对音频内容对象的内容分析后，由运算处理模块27将不同的音频内容对象分配到不同的功率放大模块的输入端去，则：
扬声器1所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000023
扬声器2所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000024
扬声器3所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000025
扬声器4所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000026
扬声器5所对应的功率放大模块输入端：
R(t，f)| f∈[60Hz，180Hz]
其中，R(t，f)| f∈[60Hz，180Hz]表示原始右声道音源中频率成分在60Hz～180Hz之间的所有的音频内容对象。
扬声器6所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000027
扬声器7所对应的功率放大模块输入端：
L(t，f)| f∈[60Hz，180Hz]
其中，L(t，f)| f∈[60Hz，180Hz]表示原始左声道音源中频率成分在60Hz～180Hz之间的所有的音频内容对象。
扬声器8所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000028
扬声器9所对应的功率放大模块输入端：
R(t，f)| f∈[60Hz，180Hz]
其中，R(t，f) |f∈[60Hz，180Hz]表示原始右声道音源中频率成分在60Hz～180Hz之间的所有的音频内容对象。
扬声器10所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000029
扬声器11所对应的功率放大模块输入端：
L(t，f)| f∈[60Hz，180Hz]
其中，L(t，f)| f∈[60Hz，180Hz]表示原始左声道音源中频率成分在 60Hz～180Hz之间的所有的音频内容对象。
扬声器12所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000030
扬声器13所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000031
扬声器14所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000032
扬声器15所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000033
扬声器16所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000034
扬声器17所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000035
扬声器18所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000036
扬声器19所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000037
扬声器20所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000038
扬声器21所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000039
扬声器22所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000040
扬声器23所对应的功率放大模块输入端：
Figure PCTCN2022120940-appb-000041
扬声器24所对应的功率放大模块输入端：
L(t，f)| f＜60Hz+R(t，f)| f＜60Hz
其中，L(t，f)| f＜60Hz、R(t，f)| f＜60Hz分别表示原始左、右声道音源中频率成分在60Hz以下的所有的音频内容对象。
对音频内容对象的路由完成后，运算处理模块中27中还可以做一些其他的数字信号处理，包括但不限于延迟调整、增益调整、相位调整，均衡调整等。处理完成后，进过数模转换和功率放大，聩给到对应的扬声器通道进行声音重放，这部分工作在功率放大模块30中进行。
请参阅图4，图4为本申请实施例提供的计算机可读存储介质的模块框图。
如图4所示，本申请实施例还提供了一种计算机可读存储介质400，该计算机可读存储介质400上存储有可执行指令410，该可执 行指令410被执行时执行本申请实施例提供的音频播放方法。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk)等。
需要说明的是，本申请内容中的各个实施例均采用递进的方式描 述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于产品类实施例而言，由于其与方法类实施例相似，所以描述的比较简单，相关之处参见方法类实施例的部分说明即可。
还需要说明的是，在本申请内容中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本申请内容。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本申请内容中所定义的一般原理可以在不脱离本申请内容的精神或范围的情况下，在其它实施例中实现。因此，本申请内容将不会被限制于本申请内容所示的这些实施例，而是要符合与本申请内容所公开的原理和新颖特点相一致的最宽的范围。

Claims (12)

  1. 一种音频播放方法，应用于车载音响系统，其特征在于，所述车载音响系统包括设置于汽车座舱内不同位置的多个扬声模组；
    所述音频播放方法包括：
    获取待播放的音频信号；
    对所述音频信号进行分解以得到不同类别的多个音源信号；其中，每个所述音源信号均包括同类别下的多个子音源信号；
    根据预设分配原则建立所有所述子音源信号与所述多个扬声模组之间的路由；其中，所述预设分配原则指示不同的所述子音源信号通过不同的所述扬声模组进行播放的规则；
    根据所述路由将各所述子音源信号均通过相应的所述扬声模组播放。
  2. 如权利要求1所述的音频播放方法，其特征在于，所述音频信号具有至少一个声道；所述对所述音频信号进行分解以得到不同类别的多个音源信号，包括：
    对所述音频信号进行分解，得到所有所述声道下的不同类别的多个音源信号。
  3. 如权利要求2所述的音频播放方法，其特征在于，所述根据预设分配原则建立所有所述子音源信号与所述多个扬声模组之间的路由，包括：
    在所有所述声道之间获取同类别的所述子音源信号之间的 相关性；
    获取所有所述子音源信号的频率；
    以所述相关性和所述频率为参考，根据预设分配原则建立所有所述子音源信号与所述多个扬声模组之间的路由。
  4. 一种车载音响系统，其特征在于，包括设置于汽车座舱内的控制与处理模组及与所述控制与处理模组连接的多个扬声模组，其中，所述多个扬声模组分别位于所述汽车座舱内的不同位置，所述控制与处理模组用于执行如权利要求1-3任一项所述的方法。
  5. 如权利要求4所述的车载音响系统，其特征在于，所述控制与处理模组包括运算处理模块和存储模块，其中，所述存储模块用于存储至少一个程序，且当所述至少一个程序被所述运算处理模块执行时，使得所述运算处理模块执行如权利要求1-3任一项所述的方法。
  6. 如权利要求5所述的车载音响系统，其特征在于，所述控制与处理模组还包括音频总线，所述音频总线用于将待播放的音频信号传输至所述运算处理模块。
  7. 如权利要求5所述的车载音响系统，其特征在于，所述控制与处理模组还包括数模转换模块，所述数模转换模块用于将所述运算处理模块输出的数字信号转换为模拟信号。
  8. 如权利要求7所述的车载音响系统，其特征在于，所述控制与处理模组还包括功率放大模块，所述功率放大模块用于将 所述数模转换模块输出的模拟信号进行功率放大以传输至所述多个扬声模组。
  9. 如权利要求8所述的车载音响系统，其特征在于，所述控制与处理模组还包括电源管理模块，所述电源管理模块用于进行所述运算处理模块、所述存储模块、所述数模转换模块、所述功率放大模块及所述多个扬声模组的供电管理。
  10. 如权利要求4所述的车载音响系统，其特征在于，所述扬声模组包括一个或多个扬声器。
  11. 如权利要求4所述的车载音响系统，其特征在于，所述扬声模组包括超低音扬声模组、低音扬声模组和中高音扬声模组。
  12. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质上存储有可执行指令，所述可执行指令被执行时执行如权利要求1-3任一项所述的方法。
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