WO2016065719A1 - 一种基于误差模型的多区域声重放方法和装置 - Google Patents
一种基于误差模型的多区域声重放方法和装置 Download PDFInfo
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- WO2016065719A1 WO2016065719A1 PCT/CN2014/095345 CN2014095345W WO2016065719A1 WO 2016065719 A1 WO2016065719 A1 WO 2016065719A1 CN 2014095345 W CN2014095345 W CN 2014095345W WO 2016065719 A1 WO2016065719 A1 WO 2016065719A1
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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
- H04S7/307—Frequency adjustment, e.g. tone control
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
- H04R29/002—Loudspeaker arrays
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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
- H04R5/02—Spatial or constructional arrangements of loudspeakers
Definitions
- the present invention relates to the field of acoustics, and in particular to a multi-region acoustic playback method and apparatus based on an error model.
- cars have occupied an increasingly important position in people's lives, and users are paying more and more attention to the acoustic environment inside the car.
- cars are often filled with a variety of sounds, such as music, navigation, phone, warning, and so on.
- sounds such as music, navigation, phone, warning, and so on.
- the driver wants to listen to navigation voices and warning sounds, and passengers sitting in the back seat may want to listen to music.
- the sounds between the exhibits cannot interfere with each other, that is, only the sounds associated with the exhibits can appear in front of different exhibits, thereby improving the user experience.
- restaurants also need to produce different background music in different areas to meet different hobbies of customers.
- the existing audio system cannot generate independent sound sources in different areas, and cannot meet the user's needs.
- the multi-regional sound reproduction system creates a separate listening space for each user by adjusting the amplitude and phase of the input signal of the speaker array, thereby creating a personalized listening space for each user, thereby avoiding the fatigue caused by wearing the headphones.
- One control method commonly used in multi-regional sound reproduction systems is the acoustic energy contrast control method. Sound energy contrast control methods are mainly divided into two categories: frequency domain design and time domain design. The frequency domain acoustic energy contrast control method in the prior art cannot guarantee the causality of the time domain impulse response filter signal, and thus the contrast performance at the uncontrolled frequency point is degraded.
- the time domain acoustic energy contrast control method in the prior art is directly designed in the time domain, avoiding the non-causal problem of the time domain impulse response filter signal, so that the frequency domain acoustic energy contrast control method can be solved at the non-control frequency point.
- the problem of reduced contrast performance is not considered the error of the speaker frequency response, which is far from the actual.
- the problems in the prior art time domain acoustic energy contrast control method can reduce the contrast performance of the multi-region acoustic reproduction system, expand the mutual interference between the sound fields in each region, and fail to create a personalized private listening space for each user. And reduce the possibility of actual system mass production. Aiming at the problem of the contrast performance degradation introduced by the speaker frequency response error existing in the existing acoustic energy contrast control method, it is necessary to find a more convenient and effective method to overcome the sound. The contrast performance degradation introduced by the frequency response error.
- the object of the present invention is to overcome the problem of the contrast performance degradation introduced by the speaker frequency response error existing in the acoustic energy contrast control method in the prior art, thereby providing a time domain capable of improving the contrast performance in the case of an error in the speaker frequency response. Sound energy contrast control method.
- the present invention provides a multi-region sound field reproduction method based on an error model, comprising:
- Step 1) arranging the speaker array, setting control points of the bright area and the dark area; wherein, the bright area is an area where an independent sound source needs to be generated, and the dark area is an area that does not need to generate an independent sound source;
- Step 2) Establish a speaker frequency response error distribution model
- Step 3) according to the error distribution model of step 2) and the speaker array, obtain a desired average acoustic energy expression and a frequency response consistency constraint expression for the bright region and the dark region in the presence of a speaker frequency response error;
- Step 4) Calculate the time domain impulse response filtering of each channel according to the expected average acoustic energy expression and the frequency response consistency constraint expression of step 3) according to the time domain acoustic energy contrast control criterion of the frequency response consistency constraint. Signal.
- the arranged speaker arrays are linear arrays or circular arrays or random arrays.
- the shape of the area of the bright or dark area is square or circular or linear.
- the error probability distribution modeling can be obtained by measurement or by model prediction.
- the measuring method of the speaker frequency response error distribution model in the step 2) comprises:
- the prediction method of the speaker frequency response error distribution model in the step 2) comprises:
- TS parameters by acoustic instrumentation of the speaker array in step 1) including the voice coil DC resistance, voice coil inductance, mechanical resistance, force compliance, vibration quality, air radiation resistance, air radiation Resistance, equivalent radiation area, electromagnetic force induction coefficient;
- the speaker frequency response error distribution model is obtained.
- the step 3) comprises:
- Step 3-1) Assume that the frequency response error of the lth speaker at frequency ⁇ is:
- o is the Hadamard product of the matrix
- w is the vector of the time domain impulse response filter coefficients of each channel
- w [w 1 (0), L, w 1 (M-1), L, w L (0), L, w L (M-1)] T
- r Bk (n) [h B1k (n), L, h B1k (n-M+1), L, h BLk (n), L, h BLk (n-M+1)] T
- the impulse response between the lth channel of the speaker and the kth control point of the bright zone is modeled as an FIR filter of length I, and h Blk (n) is a coefficient.
- the expression of A is:
- the time domain average acoustic energy radiated by the speaker array to the bright region is:
- the expected average acoustic energy of the bright zone is:
- ⁇ AA H ⁇ contains the error probability distribution model parameters, which are provided by step 2).
- r Dk (n) [h D1k (n), L, h D1k (n-M+1), L, h DLk (n), L, h DLk (n-M+1)] T
- the impulse response between the lth channel of the speaker and the kth control point of the dark zone is modeled as an FIR filter of length I, h Dlk (n) is the coefficient, so the expected average acoustic energy of the dark zone is :
- Step 3-3) Select the reference frequency ⁇ r to define the frequency response consistency constraint RV of the bright region.
- the expression of the frequency response consistency constraint is:
- said step 4) comprises:
- Step 4-1) According to the time domain acoustic energy contrast control criterion of frequency response consistency constraint, the optimization problem is listed as:
- Step 4-2) Find the solution to the optimization problem obtained in step 4-1):
- P max ⁇ is the unit eigenvector of the largest eigenvalue corresponding to the matrix
- U is the identity matrix
- ⁇ is the robust parameter
- ⁇ is the weight parameter
- the parameters ⁇ and ⁇ take positive numbers
- Step 4-3) The vector w obtained in the step 4-2) is cut every M elements to obtain a time domain impulse response filter signal of each channel.
- the invention also provides a multi-regional sound reproducing device based on an error model, comprising:
- a speaker array arranging module for arranging the speaker array and setting control points of the bright area and the dark area; wherein the bright area refers to an area where an independent sound source needs to be generated, and the dark area refers to All areas where an independent source is not required to be generated;
- a speaker frequency response error acquisition module for modeling a probability distribution of frequency response errors
- An average acoustic energy expression acquisition module is desired for separately listing desired average acoustic energy expressions for the bright and dark regions;
- a frequency response consistency constraint expression obtaining module for selecting a reference frequency and listing a frequency response consistency constraint expression in the bright region
- the time domain impulse response filter signal calculation module calculates the time domain impulse response filter signal of each channel according to the time domain acoustic energy contrast control criterion of the frequency response consistency constraint.
- the invention is directly designed in the time domain, and avoids the non-causality of the time domain impulse response filter signal obtained by the inverse Fourier transform in the frequency domain acoustic energy contrast control design method, and the broadband contrast performance is far greater than the frequency. Wideband contrast performance of the domain acoustic energy contrast control method.
- the present invention models the probability distribution of the speaker frequency response error, and utilizes the error model in the control design. Compared with the time domain acoustic energy contrast control design method, the contrast performance degradation introduced by the speaker frequency response error can be effectively reduced. The impact of the device is enhanced by the robustness and reliability.
- the multi-regional sound reproducing device of the present invention can be applied to a home theater, and a car audio or the like needs to generate multiple independent
- the field of the vertical sound source area can effectively reduce the speaker frequency response error, thus creating a better private listening space.
- FIG. 1 is a flow chart of an error model based multi-region acoustic playback method of the present invention
- FIG. 2 is a schematic view showing the arrangement of a linear speaker array and a light and dark area in one embodiment
- Figure 3 (a) is the experimental distribution of the speaker frequency response amplitude error and the corresponding Gaussian distribution fitting curve
- Figure 3(b) shows the experimental distribution of the frequency response phase error of the loudspeaker and the corresponding Gaussian distribution fitting curve.
- FIG. 4(a) is a schematic diagram showing the comparison of the contrast performance of the method of the present invention and the prior art when the speaker frequency response error is an average distribution;
- 4(b) is a schematic diagram showing comparison of contrast performance between the method of the present invention and the prior method when the frequency response error of the speaker is Gaussian;
- the basic idea of the invention is to model the probability distribution of the speaker frequency response error, obtain the expected average sound energy of the light and dark area according to the error model, and finally design the time domain acoustic energy contrast criterion based on the frequency response consistency constraint.
- the multi-regional sound reproducing device can effectively reduce the problem of the contrast performance degradation introduced by the speaker frequency response error, and improve the robustness of the system.
- the inventive method based on the above idea eliminates the prior art acoustic energy contrast control method without considering the contrast performance degradation introduced by the speaker frequency response error.
- the error model based multi-region acoustic playback method of the present invention includes the following steps:
- Step 1) arranging the speaker array, setting control points of the bright area and the dark area; wherein, the bright area is an area where an independent sound source needs to be generated, and the dark area is an area that does not need to generate an independent sound source;
- Step 2) establishing a speaker frequency response error distribution model
- Step 3) according to the error distribution model of step 2) and the speaker array, obtain a desired average acoustic energy expression and a frequency response consistency constraint expression for the bright region and the dark region in the presence of a speaker frequency response error;
- Step 4) Calculate the time domain impulse response filter signal of each channel according to the time domain acoustic energy contrast control criterion of the frequency response consistency constraint.
- the arranged speaker arrays are linear arrays or circular arrays, and may also be random arrays.
- the shape of the area of the bright or dark area may be square or circular, or may be linear.
- the error probability distribution modeling can be obtained by measurement or by model prediction.
- the measuring method of the speaker frequency response error distribution model in the step 2) includes:
- the prediction method of the speaker frequency response error distribution model in the step 2) includes:
- TS parameters by acoustic instrumentation of the speaker array in step 1) including the voice coil DC resistance, voice coil inductance, mechanical resistance, force compliance, vibration quality, air radiation resistance, air radiation Resistance, equivalent radiation area, electromagnetic force induction coefficient;
- the speaker frequency response error distribution model is obtained.
- the step 3) specifically includes the following steps:
- Step 3-1) Assume that the frequency response error of the lth speaker at frequency ⁇ is:
- o is the Hadamard product of the matrix
- w is the vector of the time domain impulse response filter coefficients of each channel
- w [w 1 (0), L, w 1 (M-1), L, w L (0), L, w L (M-1)] T
- r Bk (n) [h B1k (n), L, h B1k (n-M+1), L, h BLk (n), L, h BLk (n-M+1)] T
- the impulse response between the lth channel of the speaker and the kth control point of the bright zone is modeled as an FIR filter of length I, and h Blk (n) is a coefficient.
- the expression of A is:
- the time domain average acoustic energy radiated by the speaker array to the bright region is:
- the expected average acoustic energy of the bright zone is:
- ⁇ AA H ⁇ contains the error probability distribution model parameters, which are provided by step 2).
- r Dk (n) [h D1k (n), L, h D1k (n-M+1), L, h DLk (n), L, h DLk (n-M+1)] T
- the impulse response between the lth channel of the speaker and the kth control point of the dark region is modeled as an FIR filter of length I, and h Dlk (n) is a coefficient. Therefore, the expected average acoustic energy of the dark zone is:
- Step 3-3) selecting the reference frequency ⁇ r , defining a frequency response consistency constraint RV of the bright region, and the expression of the frequency response consistency constraint is:
- the step 4) specifically includes the following steps:
- Step 4-1) According to the time domain acoustic energy contrast control criterion of frequency response consistency constraint, the optimization problem is listed as:
- Step 4-2) Find the solution to the optimization problem obtained in step 4-1):
- P max ⁇ is the unit eigenvector of the largest eigenvalue corresponding to the matrix
- U is the identity matrix
- ⁇ is the robust parameter
- ⁇ is the weight parameter
- the parameters ⁇ and ⁇ take positive numbers
- Step 4-3) The vector w obtained in the step 4-2) is cut every M elements to obtain a time domain impulse response filter signal of each channel.
- a linear speaker array is placed, and the bright and dark regions are in the 45-degree direction on the vertical line in the speaker array, and the distance between the speaker arrays is 1 m, and the speaker is The array is on the same level; the speaker array consists of 8 units with a 4 cm pitch.
- the simulation environment is free sound field, the system sampling rate is set to 8 kHz, the impulse response from the speaker to the control point is modeled as FIR filter, the length I is 1600 steps, and the time domain impulse response filter of each channel is set.
- the length is 100, and according to the probability distribution given in step (1), the expected average acoustic energy of the bright and dark regions are respectively listed.
- the selected reference frequency is 1 kHz
- the constrained frequency point is [80, 80 ⁇ 2, L 80 ⁇ 49] Hz
- the constraint expression of frequency response consistency is listed.
- the vector w is cut every M elements to obtain a time domain impulse response filter signal of each channel.
- Figure 4 shows the broadband desired contrast performance in the presence of speaker frequency response errors in the method of the present invention and is compared to prior art methods.
- desired contrast C f performance is defined as follows
- the frequency domain acoustic energy contrast control method in the prior art whether the error is an average distribution or a Gaussian distribution (JHChang, CHLee, JYPark and YHKim.
- a realization of sound focused personal audio system using The acoustic contrast control.J Acoust.Soc.Am.125(4):2091-7) has the worst broadband contrast performance, and the contrast performance drops sharply at some frequency points, and can only achieve better results at a limited control point.
- the time domain acoustic energy contrast control method Y.Cai, M.Wu and J.Yang.Design of a time-domain acoustic contrast control for broadband input signals in personal audio systems.
- ICASSP 2013. can be A better desired contrast performance is achieved over the entire broadband.
- the method of the present invention performs better than the time domain method in terms of the desired contrast performance over the entire frequency band. This indicates that the method has better interference to the speaker frequency response error than the acoustic energy contrast control method in the prior art.
- the sampling frequency is limited to 8 kHz, and the bright region and the dark region are selected as the linear region, this is only an example of the method provided by the present invention, and the method provided by the present invention is not limited to the applicable person.
- the method provided by the present invention can only select the line type.
- the method provided by the present invention can extend the wideband signal to the entire audible frequency segment and achieve multi-region acoustic playback.
- the invention also provides a multi-regional sound reproducing device based on an error model, comprising:
- a speaker array arranging module for arranging the speaker array and setting control points of the bright area and the dark area; wherein the bright area refers to an area where an independent sound source needs to be generated, and the dark area refers to All areas where an independent source is not required to be generated;
- a speaker frequency response error acquisition module for modeling a probability distribution of frequency response errors
- An average acoustic energy expression acquisition module is desired for separately listing desired average acoustic energy expressions for the bright and dark regions;
- a frequency response consistency constraint expression obtaining module for selecting a reference frequency and listing a frequency response consistency constraint expression in the bright region
- the time domain impulse response filter signal calculation module calculates the time domain impulse response filter signal of each channel according to the time domain acoustic energy comparison control criterion of the frequency response consistency constraint.
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Abstract
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Claims (9)
- 一种基于误差模型的多区域声重放方法,包括以下步骤:步骤1):布放扬声器阵列,设定明区和暗区的控制点;其中,明区是需要产生一独立音源的区域,暗区是所有不需要产生一独立音源的区域;步骤2):建立扬声器频响误差分布模型;步骤3):根据步骤2)的误差分布模型和所述扬声器阵列,得到明区和暗区在存在扬声器频响误差情况下的期望平均声能量表达式和频率响应一致性约束表达式;步骤4):根据步骤3)的期望平均声能量表达式和频率响应一致性约束表达式,按照频率响应一致性约束的时域声能量对比度控制准则,计算出各个通道的时域冲激响应滤波器信号。
- 根据权利要求1所述的基于误差模型的多区域声重放方法,其特征在于,在所述的步骤1)中,所布放的扬声器阵列为线性阵列或圆形阵列或随机阵列。
- 根据权利要求1所述的基于误差模型的多区域声重放方法,其特征在于,在所述的步骤1)中,所述明区或暗区的区域形状是方形或圆形或线型。
- 根据权利要求1所述的基于误差模型的多区域声重放方法,其特征在于,在所述步骤2)中,所述的扬声器频响误差分布模型通过测量获得或者通过模型预测获得。
- 根据权利要求4所述的基于误差模型的多区域声重放方法,其特征在于,所述步骤2)中的扬声器频响误差分布模型的建立方法包括:(1)测量一组扬声器在频率f处的频响,分别获取扬声器频响的幅度分布和相位分布;(2)根据实际测量的分布进行分布曲线拟合,获取扬声器频响误差分布模型。
- 根据权利要求4所述的基于误差模型的多区域声重放方法,其特征在于,所述步骤2)中的扬声器频响误差分布模型的建立方法包括:(1)用声学仪器对步骤1)中的扬声器的测量获得TS参数,所述的TS参数包括音圈直流电阻、音圈电感、机械阻、力顺、振动质量、空气辐射阻、空气辐射抗、等效辐射面积、电磁力感应系数;(2)采用蒙特卡罗方法通过对TS参数抽样,仿真扬声器的频响,获取扬声器 的频响的幅度和相位分布;(3)根据获得的扬声器频响的幅度和相位分布进行曲线拟合,获取扬声器频响误差分布模型。
- 根据权利要求1所述的基于误差模型的多区域声重放方法,其特征在于,所述步骤3)包括:步骤3-1):假定第l=1L L个扬声器在频率ω处的频响误差Al(ω),其表达式为:其中,KB为明区的控制点个数;o为矩阵的Hadamard积,w是各个通道的时域冲激响应滤波器系数组成的向量,其表达式为w=[w1(0),L,w1(M-1),L,wL(0),L,wL(M-1)]T其中M为每个通道的滤波器阶数,sBk(ω)的表达式为:sBk(ω)=[rBk(0),L,rBk(M+I-2)][1,e-jω,L,e-jω(I+M-2)]TrBk(n)=[hB1k(n),L,hB1k(n-M+1),L,hBLk(n),L,hBLk(n-M+1)]T其中将扬声器第l通道到明区的第k个控制点之间的冲激响应建模成一个长度为I的FIR滤波器,hBlk(n)为系数。A的表达式为:其中E{}是取随机变量的期望值,E{AAH}包含了误差概率分布模型参数,由步骤2)提供。其中KD为明区的控制点个数,sDk(ω)的表达式为:sDk(ω)=[rDk(0),L,rDk(M+I-2)][1,e-jω,L,e-jω(I+M-2)]TrDk(n)=[hD1k(n),L,hD1k(n-M+1),L,hDLk(n),L,hDLk(n-M+1)]T其中将扬声器第l通道到暗区的第k个控制点之间的冲激响应建模成一个长度为I的FIR滤波器,hDlk(n)为系数。因此暗区的期望平均声能量为:步骤3-3):选定参考频率ωr,定义明区的频率响应一致性约束RV,该频率响应一致性约束的表达式为:
- 一种基于误差模型的多区域声重放装置,其特征在于,包括:扬声器阵列布放模块,用于布放扬声器阵列,并设定明区和暗区的控制点,其中,所述的明区是指是需要产生某独立音源的区域,所述的暗区是指所有不需要产生某独立音源的区域;扬声器频响误差获取模块,用于对频响误差进行概率分布建模;期望平均声能量表达式获取模块,用于分别列出明区和暗区的期望平均声能量表达式;频率响应一致性约束表达式获取模块,用于选定参考频率,列出明区中的频率响应一致性约束表达式;时域冲激响应滤波器信号计算模块,按照频率响应一致性约束的时域声能量对比控制准则,计算出各个通道的时域冲激响应滤波器信号。
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CN115038010A (zh) * | 2022-04-26 | 2022-09-09 | 苏州清听声学科技有限公司 | 一种基于扬声器阵列的声场重建控制方法及系统 |
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