WO2019061901A1 - 一种汽车音响立体声扩展方法 - Google Patents

一种汽车音响立体声扩展方法 Download PDF

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WO2019061901A1
WO2019061901A1 PCT/CN2017/118383 CN2017118383W WO2019061901A1 WO 2019061901 A1 WO2019061901 A1 WO 2019061901A1 CN 2017118383 W CN2017118383 W CN 2017118383W WO 2019061901 A1 WO2019061901 A1 WO 2019061901A1
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channel signal
speaker
delay
sound
stereo
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PCT/CN2017/118383
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English (en)
French (fr)
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余惠雄
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惠州市德赛西威汽车电子股份有限公司
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Priority to US16/614,371 priority Critical patent/US10771915B2/en
Publication of WO2019061901A1 publication Critical patent/WO2019061901A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • H04S7/303—Tracking of listener position or orientation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
    • 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
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • 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
    • H04R5/02—Spatial or constructional arrangements of 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
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
    • 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 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/13—Application of wave-field synthesis in stereophonic audio systems

Definitions

  • the present invention relates to the field of stereo technology, and in particular to a car audio stereo expansion method.
  • a typical stereo sound requires a pair of speakers.
  • the distance between the speakers is more than 1 meter. It is placed in front of the listener.
  • the listener and the two speakers form an equilateral triangle. This effect is better and can present a normal sound field.
  • the performance of the sound field can bring satisfaction to people.
  • Today's stereo expansion technology is based on a symmetrical listening environment that has a positive effect on TVs, computers and portable devices.
  • the use environment of the car is not considered, and the application effect in the car is not good.
  • Car audio reproduction in the sound field of a car Due to the particularity of the car environment, it is difficult to express the sound field that should be. Since the seat of the car is on one side, the distance between the listener and the left and right speakers in the car environment is asymmetrical, and the listening angles on the left and right sides of the listener are several times different; and the glass window is large, the hardness of the glass is large, and the sound is almost totally reflected. The reflected sound is very strong, affecting the display of the sound field.
  • the sound from the left speaker has a direct sound Ld to the driver's left ear, and there is also a reflected sound Lr1+Lr2 reflected by the passenger's door glass to the driver's right ear.
  • the right speaker The sound that is emitted right to the right ear of the driver's right ear, also has the reflected sound Rr1+Rr2 reflected by the driver's door glass to the left ear. Since the distance between the direct sound and the reflected sound is not far from each other, their sound is not much difference. So that it seriously affects the display of the sound field.
  • the existing solution is to add delay to the left channel, so that the sound heard by the driver can be centered.
  • the sound field is limited to the range of the front windshield.
  • the current stereo expansion technology can expand the sound, but there will be some Unreal and unreal feeling, and the known technology is to solve the problem of asymmetry in the listening environment of the car with time delay, but it does not solve the problem of the reflected sound of the door glass.
  • the present invention provides a car stereo stereo expansion method in order to overcome the above-described drawbacks of the prior art.
  • a car stereo stereo expansion method includes the following steps:
  • the first period delay processing of the first channel signal and the second channel signal in step S10 includes: setting a delay of the first delay device of the first speaker and the second speaker, respectively. time.
  • the delay time of the first delayer of the first speaker is calculated by the following formula:
  • T11 L/V+T21;
  • T11 represents the delay time of the first delay of the first speaker
  • T21 represents the delay time of the first delay of the second speaker
  • the unit is s
  • L represents the first channel signal and the second channel
  • V is the speed at which the sound travels in the air.
  • the delay time T21 of the first delay device of the second speaker is set to zero.
  • performing the second period delay processing on the first channel signal and the second channel signal in step S20 includes: setting a delay time of the second delay device of the first speaker and the second speaker, respectively.
  • the delay time of the second delay of the first speaker is calculated by the following formula:
  • T12 (Lr1+Lr2-Ld)/V
  • T12 represents the delay time of the second delay of the first speaker, the unit is s;
  • Lr1 represents the first segment path of the first channel signal reflection sound;
  • Lr2 represents the second segment path of the first channel signal reflection sound;
  • Ld represents the first channel signal direct sound path;
  • V represents the speed of sound propagation in the air.
  • the delay time of the second delay device of the second speaker is calculated by the following formula:
  • T22 (Rr1+Rr2-Rd)/V
  • T22 represents the delay time of the second delay of the second speaker, the unit is s;
  • Rr1 represents the first segment path indicating the second channel signal reflection;
  • Rr2 represents the second segment path of the second channel signal reflection sound ;
  • Rd indicates the second channel signal direct sound path;
  • V indicates the speed of sound propagation in the air.
  • the filtering process is separately performed before the second segment delay processing is performed on the first channel signal and the second channel signal in step S20.
  • the filtering process includes filtering a low frequency signal that is not obvious to the sense of orientation and a high frequency signal that is insensitive to the phase.
  • the first speaker is a left speaker
  • the second speaker is a right speaker
  • the invention performs the two delay processing on the channel signal, cancels out the signal reflected by the door glass, so that the sound field can be better displayed, and the sound field processing method of the invention can make the sound heard by the driver.
  • the sound field is centered, and the diffusion on both sides is symmetrical.
  • the sound field can be extended to the outside of the vehicle, which solves the problem that the car audio is off the side of the sound field in the car environment, the sound field width is narrow, the sound field cannot be opened, and the listening feeling is poor.
  • the sound is real, there is no illusion, empty feeling.
  • Figure 1 is a diagram showing the acoustic propagation path of the speaker sound of the present invention to the driver's ears.
  • FIG. 2 is a flow chart showing the steps of the audio stereo expansion processing method of the present invention.
  • FIG. 3 is a schematic diagram of a method for processing an audio stereo expansion according to the present invention.
  • the first speaker is 1, the first amplifier is 11, the first delay of the first speaker is 12, the first filter is 13, the second delay of the first speaker is 14, and the first mixer 15, the second speaker is 2, the second amplifier is 21, the second delay of the second speaker is 22, the second filter is 23, the second delay of the second speaker is 24.
  • the second mix is The device is 25.
  • a pair of speakers are symmetrically disposed on both sides of the car, wherein the first speaker 1 is close to the driving position, and the second speaker 2 is away from the driving position, due to the first speaker 1 and the second speaker 2 and the driving position
  • the distances are different, so the listening angles on the left and the right are several times different; and the glass windows are large, the hardness of the glass is large, the sound is almost totally reflected, and the reflected sound is strong, which affects the display of the sound field.
  • the present invention performs two signals on the channel. The secondary delay processing cancels out the signals reflected by the door glass, so that the sound field can be better displayed.
  • the relative position represents the distance between the speaker and the driving position
  • the speaker closer to the driving position is defined as the first speaker 1
  • the speaker farther from the driving position is defined as the second speaker 2
  • the first speaker 1 is one
  • the second The speaker 2 is at least one; the delay time of the second channel signal of the second speaker 2 farther from the driving position is different to the delay time of the first channel signal of the first speaker 1 which is closer to the driving position Different, you need to set the delay separately.
  • the first delay processing of the first channel signal and the second channel signal specifically includes: setting the delays of the first delay device 12 of the first speaker 1 and the first delay device 22 of the second speaker 2, respectively. time.
  • the delay time of the first delay 12 of the first speaker 1 is calculated by the following formula:
  • T11 L/V+T21;
  • T11 represents the delay time of the first delay of the first speaker
  • T21 represents the delay time of the first delay of the second speaker
  • the unit is s
  • L represents the first channel signal and the second channel
  • V is the speed at which the sound travels in the air.
  • the delay time T21 of the first delay 22 of the second speaker 2 is set to zero.
  • the delay time T21 of the first delay device 22 of the second speaker 2 farther from the driving position is set to 0, and the delay of the first delay device 12 of the first speaker 1 which is closer to the driving position is delayed.
  • the time T11 is set according to the formula calculated by the formula. In actual operation, the actual vehicle needs to be fine-tuned, which is subject to actual adjustment.
  • the first channel signal after the first delay is output to the first mixer 15, while the second channel delay processing is performed on the first channel signal according to the relative position, and then output to the second mixer 25;
  • the second channel signal after the first period of delay is output to the second mixer 25, and the second channel delay processing is performed on the second channel signal according to the relative position, and then output to the first mixer 15.
  • the second stage delay processing of the first channel signal and the second channel signal includes setting a delay time of the second delay unit 14 of the first speaker and the second delay unit 24 of the second speaker, respectively.
  • the delay time of the second delay 14 of the first speaker is calculated by the following formula:
  • T12 (Lr1+Lr2-Ld)/V
  • T12 represents the delay time of the second delay of the first speaker, the unit is s;
  • Lr1 represents the first segment path of the first channel signal reflection sound;
  • Lr2 represents the second segment path of the first channel signal reflection sound;
  • Ld represents the first channel signal direct sound path;
  • V represents the speed of sound propagation in the air.
  • the delay time of the second delay 24 of the second speaker is calculated by the following formula:
  • T22 (Rr1+Rr2-Rd)/V
  • T22 represents the delay time of the second delay of the second speaker, the unit is s;
  • Rr1 represents the first segment path indicating the second channel signal reflection;
  • Rr2 represents the second segment path of the second channel signal reflection sound ;
  • Rd indicates the second channel signal direct sound path;
  • V indicates the speed of sound propagation in the air.
  • the first channel signal and the second channel signal are separately subjected to filtering processing before the second-stage delay processing, and the filtering process includes filtering the low-frequency signal and the phase-insensitive to the invisible sense. High frequency signal.
  • the first channel signal of the first speaker 1 passes through the first amplifier 11 and the first delay device 12 of the first speaker, and is divided into two signals, and one signal of the first channel signal is directly output to the first channel.
  • a mixer 15 the other signal is filtered by the first filter 13 and then passed through the second delay 14 of the first speaker and output to the second mixer 25; meanwhile, the second channel of the second speaker 2
  • the signal passes through the second amplifier 21 and the first delay 22 of the second speaker, the signal is divided into two signals, one signal of the second channel signal is directly output to the second mixer 25, and the other signal is passed through the second filter.
  • the filter 23 is filtered and then output to the first mixer 15 through the second delay unit 24 of the second speaker.
  • the first channel signal outputted to the first mixer 15 is added to obtain a channel signal for driving the first speaker 1;
  • the first channel signal after the two-stage delay is added to the second channel signal outputted to the second mixer 25 after the inversion operation to obtain the channel signal for driving the second speaker 2.
  • the first mixer 15 is the first channel signal directly received minus the signal of the second channel signal after the second delay processing, and the output of the first speaker 1 includes the second channel signal.
  • the inverted signal after the filtering delay is cancelled by the second channel signal reflected to the left side of the driver in the vehicle; similarly, the second mixer 25 is the second channel signal directly received minus the first sound.
  • the output of the second speaker 2 includes the inverted signal after the filtering delay of the first channel signal, and the first channel reflected to the right side of the driver. Signal cancellation.
  • the stereo sound field can be well expanded, and it is a real sound field, and there is no illusory feeling.
  • the first speaker 1 is a left speaker
  • the second speaker 2 is a right speaker
  • the first channel signal is a left channel signal
  • the second channel signal is a right channel signal
  • the first amplifier 11 is a left amplifier
  • the second amplifier 21 is a right amplifier
  • the first filter 13 is a left filter
  • the second filter 23 is a right filter
  • the first mixer 15 is a left mixer
  • the second mixer 25 is a right mixer. Sounder.
  • the invention performs the two delay processing on the channel signal, cancels out the signal reflected by the door glass, so that the sound field can be better displayed, and the sound field processing method of the invention can make the sound heard by the driver.
  • the sound field is centered, and the diffusion on both sides is symmetrical.
  • the sound field can be extended to the outside of the vehicle, which solves the problem that the car audio is off the side of the sound field in the car environment, the sound field width is narrow, the sound field cannot be opened, and the listening feeling is poor.
  • the sound is real, there is no illusion, empty feeling.
  • the first speaker is the speaker closest to the driving position
  • the second speaker is farther away from the driving position than the first speaker
  • the second speaker is not limited to one, and may be multiple or multiple
  • the delay time of the second speaker is set with a delay time relative to the first speaker
  • the positions of the first speaker and the second speaker may be the front side of the automobile or the rear side of the automobile. It is not limited to the relative position in this embodiment.

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Abstract

本发明涉及一种汽车音响立体声扩展方法技术领域，通过对扬声器中的声道信号进行两次延时处理，相互抵消掉经过门玻璃反射后的信号，使得声场得以更好的展现，本发明的声场处理方法，可以使驾驶员听到的声音的声场是居中的，两边的扩散是对称的；同时声场可以扩展到车外，解决了汽车音响在汽车环境下声场偏一边，声场宽度较窄，声场展不开以及听感差的问题，使听到的声音真实，没有虚幻、空洞的感觉。

Description

一种汽车音响立体声扩展方法 技术领域
本发明涉及立体声技术领域，具体涉及一种汽车音响立体声扩展方法。
背景技术
一般立体声音响需要一对音箱，音箱之间的摆放距离大于1米，摆在倾听者的前方，倾听者与两个音箱形成正三角形，这样的效果较好，能够呈现出正常的声场，良好的声场表现能带给人以满足感。
现在的立体声扩展技术都是基于对称的聆听环境所做的，在电视机、电脑和便携设备等使用有正面的效果。但是没有考虑汽车的使用环境，在汽车的应用效果不好。汽车音响在汽车的声场重现由于汽车环境的特殊性，很难表现出应有的声场。由于汽车的座位是偏一边，汽车环境下倾听者与左右扬声器的距离是不对称的，倾听者左右两边的倾听角度相差数倍；而且玻璃窗多，玻璃的硬度大，对声音几乎全反射，反射声很强，影响了声场的展现。
比如在驾驶位(如图1)，左扬声器发出的声音有到驾驶员左耳的直达声Ld，也有经过副驾驶门玻璃反射到驾驶员右耳的反射声Lr1+Lr2，同理，右扬声器发出的声音右到驾驶员右耳的直达声Rd，也有经过驾驶员的门玻璃反射到左耳的反射声Rr1+Rr2，由于直达声与反射声的距离相差不远，他们的声音差不大，以至于严重影响声场的展现。
现在已有的解决方法是在左声道加延时，使驾驶员听到的声音可以居中，声场局限在前挡风玻璃的范围，用现在的立体声扩展技术能把声音扩展一些，但会有些虚幻不真实的感觉，且已知的技术是用延时来解决汽车内听音环境不对称的问题，但没有解决门玻璃反射声的问题。
发明内容
本发明为克服上述现有技术所述的缺陷，提供一种汽车音响立体声扩展方法。
为解决上述技术问题，本发明的技术方案如下：
一种汽车音响立体声扩展方法，包括如下步骤：
S10.根据相对位置分别对输出至靠近驾驶位的第一扬声器的第一声道信号以及输出至远离驾驶位的第二扬声器的第二声道信号做不同程度的第一段延时处理；
S20.将经过第一段延时后的第一声道信号输出至第一混音器，同时根据相对位置对第一声道信号做第二段延时处理后输出至第二混音器；将经过第一段延时后的第二声道信号输出至第二混音器，同时根据相对位置对第二声道信号做第二段延时处理后输出至第一混音器；
S30.将经过第二段延时后的第二声道信号做反相操作后与输出至第一混音器的第一声道信号相加得到驱动第一扬声器的声道信号；将经过第二段延时后的第一声道信号做反相操作后与输出至第二混音器的第二声道信号相加得到驱动第二扬声器的声道信号。
进一步的，作为优选技术方案，步骤S10中对第一声道信号和第二声道信号做第一段延时处理包括：分别设置第一扬声器和第二扬声器的第一延时器的延时时间。
进一步的，作为优选技术方案，第一扬声器的第一延时器的延时时间由以下公式计算：
T11＝L/V+T21；
其中：T11表示第一扬声器的第一延时器的延时时间，T21表示第二扬声器的第一延时器的延时时间，单位为s；L表示第一声道信号和第二声道信号到达驾驶位的直达声路径差，单位为m；V表示声音在空气中的传播速度。
进一步的，作为优选技术方案，设置第二扬声器的第一延时器的延时时间T21为0。
进一步的，作为优选技术方案，步骤S20中对第一声道信号和第二声道信号做第二段延时处理包括：分别设置第一扬声器和第二扬声器的第二延时器的延时时间。
进一步的，作为优选技术方案，第一扬声器的第二延时器的延时时间由以下公式计算：
T12＝(Lr1+Lr2-Ld)/V；
其中：T12表示第一扬声器的第二延时器的延时时间，单位为s；Lr1表示第一声道信号反射声第一段路径；Lr2表示第一声道信号反射声第二段路径；Ld表示第一声道信号直达声路径；V表示声音在空气中的传播速度。
进一步的，作为优选技术方案，第二扬声器的第二延时器的延时时间由以下公式计算：
T22＝(Rr1+Rr2-Rd)/V；
其中：T22表示第二扬声器的第二延时器的延时时间，单位为s；Rr1表示表示第二声道信号反射声第一段路径；Rr2表示第二声道信号反射声第二段路径；Rd表示第二声道信号直达声路径；V表示声音在空气中的传播速度。
进一步的，作为优选技术方案，步骤S20中对第一声道信号和第二声道信号做第二段延时处理前需先分别进行滤波处理。
进一步的，作为优选技术方案，所述滤波处理包括采用滤波器滤掉对方位感不明显的低频信号和对相位不敏感的高频信号。
进一步的，作为优选技术方案，所述第一扬声器是左扬声器，所述第二扬声器是右扬声器。
与现有技术相比，本发明技术方案的有益效果是：
本发明通过对声道信号进行两次延时处理，相互抵消掉经过门玻璃反射后的信号，使得声场得以更好的展现，采用本发明的声场处理方法，可以使驾驶员听到的声音的声场是居中的，两边的扩散是对称的；同时声场可以扩展到车外，解决了汽车音响在汽车环境下声场偏一边，声场宽度较窄，声场展不开以及听感差的问题，使听到的声音真实，没有虚幻、空洞的感觉。
附图说明
图1为本发明扬声器声音到驾驶员双耳的声学传播路径图。
图2为本发明音响立体声扩展处理方法步骤流程图。
图3为本发明音响立体声扩展处理方法原理图。
其中，第一扬声器为1、第一放大器为11、第一扬声器的第一延时器为12、第一滤波器为13、第一扬声器的第二延时器为14、第一混音器为15、第二扬声器为2、第二放大器为21、第二扬声器的第一延时器为22、第二滤波器为23、第二扬声器的第二延时器为24、第二混音器为25。
附图仅用于示例性说明，不能理解为对本专利的限制；为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的；相同或相似的标号对应相同或相似的部件；附图中描述位置关系的用语仅用于示例性说 明，不能理解为对本专利的限制。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述，以使本发明的优点和特征更易被本领域技术人员理解，从而对本发明的保护范围作出更为清楚的界定。
实施例1
如图1-图3所示：一对扬声器对称设置在汽车的两侧，其中第一扬声器1靠近驾驶位，第二扬声器2远离驾驶位，由于第一扬声器1和第二扬声器2与驾驶位的距离不同，因此左右两边的倾听角度相差数倍；而且玻璃窗多，玻璃的硬度大，对声音几乎全反射，反射声很强，影响了声场的展现，本发明通过对声道信号进行两次延时处理，相互抵消掉经过门玻璃反射后的信号，使得声场得以更好的展现。
具体包括如下步骤：
S10.根据相对位置分别对输出至靠近驾驶位的第一扬声器1的第一声道信号以及输出至远离驾驶位的第二扬声器2的第二声道信号做不同程度的第一段延时处理。
其中，相对位置表示扬声器与驾驶位的距离，距离驾驶位较近的扬声器定义为第一扬声器1，距离驾驶位较远的扬声器定义为第二扬声器2，且第一扬声器1是一个，第二扬声器2至少是一个；不同程度表示距离驾驶位较远的第二扬声器2的第二声道信号的延时时间与距离驾驶位较近的第一扬声器1的第一声道信号的延时时间不同，需对其分别进行延时设置。
对第一声道信号和第二声道信号做第一段延时处理具体包括：分别设置第一扬声器1的第一延时器12和第二扬声器2的第一延时器22的延时时间。
第一扬声器1的第一延时器12的延时时间由以下公式计算：
T11＝L/V+T21；
其中：T11表示第一扬声器的第一延时器的延时时间，T21表示第二扬声器的第一延时器的延时时间，单位为s；L表示第一声道信号和第二声道信号到达驾驶位的直达声路径差，单位为m；V表示声音在空气中的传播速度。
设置第二扬声器2的第一延时器22的延时时间T21为0。
此步骤中将距离驾驶位较远的第二扬声器2的第一延时器22的延时时间T21设置为0，距离驾驶位较近的第一扬声器1的第一延时器12的延时时间T11根据公式计算得到的数值设置，在实际操作中还需要对实车进行微调，以实际调整为准。
S20.将经过第一段延时后的第一声道信号输出至第一混音器15，同时根据相对位置对第一声道信号做第二段延时处理后输出至第二混音器25；将经过第一段延时后的第二声道信号输出至第二混音器25，同时根据相对位置对第二声道信号做第二段延时处理后输出至第一混音器15。
对第一声道信号和第二声道信号做第二段延时处理包括：分别设置第一扬声器的第二延时器14和第二扬声器的第二延时器24的延时时间。
第一扬声器的第二延时器14的延时时间由以下公式计算：
T12＝(Lr1+Lr2-Ld)/V；
其中：T12表示第一扬声器的第二延时器的延时时间，单位为s；Lr1表示第一声道信号反射声第一段路径；Lr2表示第一声道信号反射声第二段路径；Ld表示第一声道信号直达声路径；V表示声音在空气中的传播速度。
第二扬声器的第二延时器24的延时时间由以下公式计算：
T22＝(Rr1+Rr2-Rd)/V；
其中：T22表示第二扬声器的第二延时器的延时时间，单位为s；Rr1表示表示第二声道信号反射声第一段路径；Rr2表示第二声道信号反射声第二段路径；Rd表示第二声道信号直达声路径；V表示声音在空气中的传播速度。
此步骤中对第一声道信号和第二声道信号做第二段延时处理前需先分别进行滤波处理，其滤波处理包括采用滤波器滤掉对方位感不明显的低频信号和对相位不敏感的高频信号。
此步骤中，第一扬声器1的第一声道信号通过第一放大器11和第一扬声器的第一延时器12后，分为两路信号，第一声道信号的一路信号直接输出至第一混音器15，另一路信号通过第一滤波器13进行滤波后通过第一扬声器的第二延时器14后输出至第二混音器25；同时，第二扬声器2的第二声道信号通过第二放大器21和第二扬声器的第一延时器22后，分为两路信号，第二声道信号的一路信号直接输出至第二混音器25，另一路信号通过第二滤波器23进行滤波后通过第二扬声器的第二延时器24后输出至第一混音器15。
S30.将经过第二段延时后的第二声道信号做反相操作后与输出至第一混音器15的第一声道信号相加得到驱动第一扬声器1的声道信号；将经过第二段延时后的第一声道信号做反相操作后与输出至第二混音器25的第二声道信号相加得到驱动第二扬声器2的声道信号。
此步骤中，第一混音器15是直接到达的第一声道信号减去第二声道信号经过第二延时处理后的信号，第一扬声器1的输出就包含了第二声道信号经过滤波延时后的反相信号，与车内反射到驾驶员左侧的第二声道信号抵消；同理，第二混音器25是直接到达的第二声道信号减去第一声道信号经过第二延时处理后的 信号，第二扬声器2的输出就包含了第一声道信号经过滤波延时后的反相信号，与车内反射到驾驶员右侧的第一声道信号抵消。
经过这样的处理，立体声的声场可以得到很好的扩展，而且是真实的声场，不会有虚幻的感觉。
本技术方案中，第一扬声器1是左扬声器，第二扬声器2是右扬声器，第一声道信号是左声道信号，第二声道信号是右声道信号，第一放大器11是左放大器，第二放大器21是右放大器，第一滤波器13是左滤波器，第二滤波器23是右滤波器，第一混音器15是左混音器，第二混音器25是右混音器。
本发明通过对声道信号进行两次延时处理，相互抵消掉经过门玻璃反射后的信号，使得声场得以更好的展现，采用本发明的声场处理方法，可以使驾驶员听到的声音的声场是居中的，两边的扩散是对称的；同时声场可以扩展到车外，解决了汽车音响在汽车环境下声场偏一边，声场宽度较窄，声场展不开以及听感差的问题，使听到的声音真实，没有虚幻、空洞的感觉。
本发明所要保护的技术方案中，第一扬声器是距离驾驶位最近的扬声器，第二扬声器较第一扬声器距离驾驶位较远，且第二扬声器不局限于一个，还可以是多个，多个第二扬声器的延时时间均与相对第一扬声器的延时时间设置，第一扬声器和第二扬声器的位置可以是汽车的前侧，也可以是汽车的后侧。不局限于本实施例中的相对位置。
显然，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进 等，均应包含在本发明权利要求的保护范围之内。

Claims (10)

  1. 一种汽车音响立体声扩展方法，其特征在于，包括如下步骤：
    S10.根据相对位置分别对输出至靠近驾驶位的第一扬声器的第一声道信号以及输出至远离驾驶位的第二扬声器的第二声道信号做不同程度的第一段延时处理；
    S20.将经过第一段延时后的第一声道信号输出至第一混音器，同时根据相对位置对第一声道信号做第二段延时处理后输出至第二混音器；将经过第一段延时后的第二声道信号输出至第二混音器，同时根据相对位置对第二声道信号做第二段延时处理后输出至第一混音器；
    S30.将经过第二段延时后的第二声道信号做反相操作后与输出至第一混音器的第一声道信号相加得到驱动第一扬声器的声道信号；将经过第二段延时后的第一声道信号做反相操作后与输出至第二混音器的第二声道信号相加得到驱动第二扬声器的声道信号。
  2. 根据权利要求1所述的一种汽车音响立体声扩展方法，其特征在于，步骤S10中对第一声道信号和第二声道信号做第一段延时处理包括：分别设置第一扬声器和第二扬声器的第一延时器的延时时间。
  3. 根据权利要求2所述的一种汽车音响立体声扩展方法，其特征在于，第一扬声器的第一延时器的延时时间由以下公式计算：
    T11＝L/V+T21；
    其中：T11表示第一扬声器的第一延时器的延时时间，T21表示第二扬声器的第一延时器的延时时间，单位为s；L表示第一声道信号和第二声道信号到达驾驶位的直达声路径差，单位为m；V表示声音在空气中的传播速度。
  4. 根据权利要求2或3所述的一种汽车音响立体声扩展方法，其特征在于， 设置第二扬声器的第一延时器的延时时间T21为0。
  5. 根据权利要求1所述的一种汽车音响立体声扩展方法，其特征在于，步骤S20中对第一声道信号和第二声道信号做第二段延时处理包括：分别设置第一扬声器和第二扬声器的第二延时器的延时时间。
  6. 根据权利要求5所述的一种汽车音响立体声扩展方法，其特征在于，第一扬声器的第二延时器的延时时间由以下公式计算：
    T12＝(Lr1+Lr2-Ld)/V；
    其中：T12表示第一扬声器的第二延时器的延时时间，单位为s；Lr1表示第一声道信号反射声第一段路径；Lr2表示第一声道信号反射声第二段路径；Ld表示第一声道信号直达声路径；V表示声音在空气中的传播速度。
  7. 根据权利要求5所述的一种汽车音响立体声扩展方法，其特征在于，第二扬声器的第二延时器的延时时间由以下公式计算：
    T22＝(Rr1+Rr2-Rd)/V；
    其中：T22表示第二扬声器的第二延时器的延时时间，单位为s；Rr1表示表示第二声道信号反射声第一段路径；Rr2表示第二声道信号反射声第二段路径；Rd表示第二声道信号直达声路径；V表示声音在空气中的传播速度。
  8. 根据权利要求1所述的一种汽车音响立体声扩展方法，其特征在于，步骤S20中对第一声道信号和第二声道信号做第二段延时处理前需先分别进行滤波处理。
  9. 根据权利要求8所述的一种汽车音响立体声扩展方法，其特征在于，所述滤波处理包括采用滤波器滤掉对方位感不明显的低频信号和对相位不敏感的高频信号。
  10. 根据权利要求1所述的一种汽车音响立体声扩展方法，其特征在于，所述第一扬声器是左扬声器，所述第二扬声器是右扬声器。
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