CN103037301B - Convenient adjustment method for restoring range information of acoustic images - Google Patents

Abstract

Provided is a convenient adjustment method for restoring range information of acoustic images. The convenient adjustment method for restoring the range information of the acoustic images comprises the following steps: Down-mixing a speaker system of an m sound track with a speaker system of a primary n sound track (m>n or m>= 3); transmitting relevant parameters got from signals of the speaker system of the m sound track to the speaker system of the primary n sound track without damages and calculating the relevant parameters in the speaker system of the primary n sound track; setting up a model which can transform the speaker system of the primary n sound track into a new speaker system of a n sound track and ensuring that distance between rebuilt acoustic images of the new speaker system of the n sound track and an audition point is the same with distance between a primary sound source of the speaker system of the m sound track and the audition point; selecting an objective function by adjusting the number of sound tracks to the minimum; solving the model; adjusting signals of speakers according to solution of the model. The convenient adjustment method for restoring the range information of the acoustic images can ensure that the distance between the rebuilt acoustic images of the new speaker system of the n sound track and an audition point is the same with the distance between a primary sound source of the speaker system of the m sound track and the audition point, and can allocate the signals of the speakers conveniently and rapidly.

Description

A kind of acoustic image range information recovers portable method of adjustment

Technical field

The invention belongs to field of acoustics, relate in particular to a kind of acoustic image range information and recover portable method of adjustment.

Background technology

5.1 multi-channel systems were once popular home theater audio systems.But along with the development of 3D video technique, Audiotechnica is had higher requirement, now multichannel audio research is absorbed in more advanced in the system of multichannel more, can provide better feeling of immersion for people.For example, 22.2 multi-channel systems in NHK laboratory have been used to ultra high-definition television relay.This advanced multi-channel system requires to place loud speaker according to own unique loud speaker arrangement method could produce best sound effect.Although 24 loud speakers can be placed in theater according to optimum method, when domestic. applications, put trouble." lower mixed " is in multi-channel system, well to reduce the method for loudspeaker channel.From mixing two channel stereo or monophony for 5.1 in ITU-R Recommendation standardization, and be used to some television receivers.Although this mixing method is very efficient, it is not also suitable for the speaker configurations of any amount.In order to make lower the mixing between a plurality of systems become feasible, people are in the urgent need to a kind of new sound field rebuilding or transformation technology.The Akio Ando in NHK laboratory in 2011 has proposed a kind of new lower mixing method, the method utilizes transformed matrix original sound field loudspeaker signal to be transformed into the loudspeaker signal of rebuilding sound field, and guarantees that original sound field and reconstruction sound field listening the physical property of point of articulation place sound consistent.The solution of this problem depends on frequency, shows that this conversion does not change tone color.The constant assurance exactly of physical property that he utilizes listens acoustic pressure size and the particle rapidity direction of point of articulation place sound constant before and after conversion.Akio Ando also utilizes his method that 22.2 multi-channel systems are simplified to 10.2 and 8.2 multi-channel systems.Utilizing after Akio Ando obtains solution, people can find, in original sound field, the energy of loudspeaker signal is unequal with the energy of rebuilding loudspeaker signal in sound field, contradicts with law of conservation of energy, shows to have damaged range information in the lower mixing method of Akio Ando.Therefore the matter of utmost importance of current required solution is how under multichannel, in mixed process, both to have kept the physical property of acceptance point place sound constant, keeps again the range information of sound source in original sound field not to be damaged.

Summary of the invention

The present invention is directed to prior art deficiency, in the sound reproduction stage, propose a kind of acoustic image range information and recover portable method of adjustment.

The invention provides a kind of acoustic image range information and recover portable method of adjustment, it is characterized in that, comprise step:

Step 1, obtains n channel loudspeaker system by mixed under m channel loudspeaker system, and lower mixed gained n channel loudspeaker system is designated as to initial n channel loudspeaker system, m > n, and m >=3;

Step 2, obtaining and measuring of relevant parameter, comprises that the original sound source of obtaining m channel loudspeaker system is to the distance d listening between the point of articulation ₀, from m channel loudspeaker system signal, obtain and listen point of articulation acoustic pressure P ₀press P with left and right otoacoustic emission _l0, P _r0with the particle rapidity V that listens point of articulation place ₀, and be sent to initial n channel loudspeaker system, wherein d ₀, P _l0, P _r0, V ₀all harmless transmission; Measure each loudspeaker distance in initial n channel loudspeaker system and listen the distance d of the point of articulation _j, measure the distance d of the left auriculare of each loudspeaker distance in initial n channel loudspeaker system _lj, measure the distance d of each loudspeaker distance auris dextra point in initial n channel loudspeaker system _rj, j=1,2 ... n; Measure number of people radius h;

Step 3, transforms to new n channel loudspeaker system signal by initial n channel loudspeaker system signal, obtains equation as follows;

$\left\{\begin{array}{c}{P}_0=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_j^2}}\\ P_{L0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Lj}}^2}}\\ P_{R0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Rj}}^2}}\\ {2d}^2=d_L^2+d_R^2-{2h}^2\\ V_0=G\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{e^{-\mathrm{ik}|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}}{|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}{\mathrm{\ω}}_j{S}_j\left(\mathrm{\ω}\right)\\ d_0=d\end{array}\right.$

represent to listen point of articulation position vector, polar coordinates are (0,0,0);

ρ ^jrepresent in initial n channel loudspeaker system the distance between j loud speaker position and initial point;

D represents the acoustic image that in new n channel loudspeaker system, all loud speakers produce and the distance of listening point of articulation place;

D ₀represent that the original sound source of m channel loudspeaker system is to the distance of listening between the point of articulation;

S _j(ω) be the signal of j loud speaker in initial n channel loudspeaker system;

π refers to circumference ratio;

Coefficient G is the acoustics constant that audio signal is propagated in air;

V ₀represent the m pleasant to the ear point of articulation of channel loudspeaker system place particle rapidity;

D _lrepresent that the acoustic image of all loud speakers generations in new n channel loudspeaker system is to the distance of left ear;

D _rrepresent that the acoustic image of all loud speakers generations in new n channel loudspeaker system is to the distance of auris dextra;

D _jrepresent in initial n channel loudspeaker system j loud speaker and the distance of listening point of articulation place;

D _ljrepresent in initial n channel loudspeaker system that j loud speaker is to the distance of left ear;

D _rjrepresent in initial n channel loudspeaker system that j loud speaker is to the distance of auris dextra;

W _jrepresent in initial n channel loudspeaker system that j loud speaker is in the acoustical power of sounding point;

ω _jexpression is to j the weight factor that loudspeaker signal is adjusted in initial n channel loudspeaker system;

P ₀represent the m pleasant to the ear point of articulation of channel loudspeaker system place acoustic pressure;

P _l0represent left auriculare place acoustic pressure in m channel loudspeaker system;

P _r0represent auris dextra point place acoustic pressure in m channel loudspeaker system;

Step 4, target setting function, adds step 3 gained equation using following mapping function formula as a constraints, obtains optimal model M

$f\left({\mathrm{\ω}}_j\right)=\left\{\begin{array}{c}1,{\mathrm{\ω}}_j\≠1\\ 0,{\mathrm{\ω}}_j=1\end{array}\right.$

Target function expression formula is $M=\min \underset{j=1}{\overset{n}{\mathrm{\Σ}}}f\left({\mathrm{\ω}}_j\right);$

Step 5, solves the minimum value of optimal model M, obtains the weight factor ω that each loudspeaker signal is adjusted _j, j=1,2 ... n;

Step 6, according to solving the weight factor ω obtaining in step 5 _j, j=1,2 ... n, adjusts the signal of each loud speaker in initial n channel loudspeaker system, obtains new n channel loudspeaker system.

The loud speaker placing structure and the system for delivering that adopt the present invention to mention, can realize and adopting under the condition of similar number loud speaker, guarantee rebuilding the pleasant to the ear point of articulation of sound field place, the acoustic pressure of left and right ear L, R place sound is constant, listen point of articulation place particle rapidity constant, can also recover sound and listen the range information between the point of articulation, adjust the signal in minimal number sound channel, thereby rebuild sound field better more easily simultaneously.

Accompanying drawing explanation

Fig. 1 is the general frame flow chart of the embodiment of the present invention

Fig. 2 is 22.2 multi-channel system loud speaker putting position figure of the embodiment of the present invention.

Fig. 3 is 10.2 multi-channel system loud speaker system of selection figure of the embodiment of the present invention.

Fig. 4 is 10.2 multi-channel system loud speaker putting position figure of the embodiment of the present invention.

Fig. 5 is that 10.2 multi-channel system loud speakers of the embodiment of the present invention produce acoustic pressure and acoustic image at the schematic diagram of ear place, left and right acoustic pressure at ear place, left and right.

Fig. 6 is that in 10.2 multi-channel systems of the embodiment of the present invention, acoustic image is to listening point of articulation point distance, and acoustic image is to left and right ear distance, the graph of a relation between number of people radius.

Embodiment

Below in conjunction with drawings and Examples, describe technical solution of the present invention in detail.

As Fig. 2, shown in 4, embodiment gets m=22, n=10, and adopting 22.2 sound channel systems to transform to 10.2 sound channel systems is that special case describes summary of the invention.22 loud speakers in 22.2 sound channel systems are placed on same sphere, and 10 loud speakers in 10.2 sound channel systems are placed on same sphere, and the radius of external sphere is for being 2 meters..2 in a present embodiment sound channel is two low frequency audio sound channels, and its signal does not process, and its position is not done to change.The general frame flow chart of the present embodiment as shown in Figure 1.

Embodiment adopts above-mentioned acoustic image range information to recover portable method of adjustment, comprises following steps:

Step 1, obtains n channel loudspeaker system by mixed under m channel loudspeaker system, and lower mixed gained n channel loudspeaker system is designated as to initial n channel loudspeaker system, m > n, and m >=3.

Embodiment will mix the speaker system (being designated as initial 10.2 channel loudspeaker systems) of initial 10.2 sound channels under 22.2 channel loudspeaker systems.The method adopting in this process is to keep original sound field and reconstruction sound field listening the physical property of point of articulation place (being the central spot of the number of people) sound (acoustic pressure size and particle rapidity direction) constant.

The implementation of step 1 comprises following sub-step,

Step 1.1, sets up three-dimensional cartesian coordinate system XYZ, and initial point is O, coordinate involved in the present invention is polar coordinates entirely, generally be designated as P (σ, θ, φ), σ wherein, θ, φ refers to respectively the distance between P point and initial point O, the angle of the line of P point and initial point O between X-axis projection and X-axis, the line of P point and initial point O and the angle between XOY plane, coordinate mentioned in this article is all with reference to this explanation.22 loud speakers in 22.2 channel loudspeaker systems are placed on same sphere, see Fig. 2, the particular location of each loud speaker is fixed, and writes down the coordinate ξ of each loud speaker ^j=(ρ _j, θ _j, φ _j) (j=1,2 ... 22), the pleasant to the ear point of articulation of the present embodiment position is initial point O place;

As shown in Figure 2, in embodiment, sphere centre coordinate is three-dimensional coordinate initial point (0, 0, 0), also for listening point of articulation place coordinate, the coordinate of 22 loud speakers is respectively (2, 0 °, 0 °), (2, 30 °, 0 °), (2, 60 °, 0 °), (2, 90 °, 0 °), (2, 120 °, 0 °), (2, 150 °, 0 °), (2, 180 °, 0 °), (2, 225 °, 0 °), (2, 270 °, 0 °), (2, 315 °, 0 °), (2, 0 °, 48 °), (2, 45 °, 48 °), (2, 90 °, 48 °), (2, 135 °, 48 °), (2, 180 °, 48 °), (2, , 225 °, 48 °), (2, , 270 °, 48 °), (2, , 315 °, 48 °), (2, , 0 °, 90 °), (2, 45 °,-30 °), (2, 90 °,-30 °), (2, , 135 °,-30 °)

Step 1.2, chooses the putting position of 10 loud speakers in initial 10.2 loudspeaker channel systems.The requirement of choosing is: (1) selects 1 loud speaker in 22.2 channel loudspeaker systems at every turn, initial point O must be included in three loud speakers in initial 10.2 channel loudspeaker systems to the ray between each loud speaker loca direction of 22.2 channel loudspeaker systems and form on the inside or limit of spherical triangle, and (2) guarantee that the spherical triangle area that three loud speakers selected in initial 10.2 channel loudspeaker systems form is all minimums of choosing simultaneously.According to above-mentioned 2 requirements can be according to the location positioning of 22 loud speakers in 22.2 channel loudspeaker systems the position of 10 loud speakers in initial 10.2 channel loudspeaker systems.After the position of 10 loud speakers of initial 10.2 channel loudspeaker systems has been selected, record the coordinate of these 10 loud speakers, be designated as ${\mathrm{\ρ}}^j=({\mathrm{\ρ}}_x^j,{\mathrm{\ρ}}_y^j,{\mathrm{\ρ}}_z^j)$ $(j=\mathrm{1,2},...10).$

In the present embodiment, as shown in Figure 4, the coordinate of recording 10 loud speakers in initial 10.2 sound channel systems is respectively (2,0 °, 0 °), (2,60 ° in the loud speaker system of selection of initial 10.2 channel loudspeaker systems, 0 °), (2,120 °, 0 °), (2,180 °, 0 °), (2,270 °, 0 °), (2,0 °, 48 °), (2,90 °, 48 °), (2,180 °, 48 °), (2,0 °, 90 °), (2,90 ° ,-30 °).

Step 1.3, solves 10 signals that loud speaker distributes in initial 10.2 channel loudspeaker systems.First ask for the signal distribution coefficient in three loud speakers in initial 10.2 sound channel systems.In actual mechanical process, ask for according to being to guarantee to listen in point of articulation place 22.2 channel loudspeaker systems three corresponding loud speakers in a loud speaker and initial 10.2 channel loudspeaker systems listening the sonorific acoustic pressure size in point of articulation place and particle rapidity direction constant, if ζ puts at place a loud speaker in 22.2 sound channel systems, ζ ₁, ζ ₂, ζ ₃three loud speakers that comprise the area minimum in the initial 10.2 channel loudspeaker systems that ζ orders are put respectively at place, see Fig. 3, and spherical radius is r, and the signal of ζ place virtual speaker is assigned to ζ ₁, ζ ₂, ζ ₃the distribution factor of place's loud speaker is respectively ω ₁, ω ₂, ω ₃:

Formula is as follows:

Wherein, i is imaginary part unit, and e represents math constant, also referred to as Euler's numbers;

ρ ₁, ρ ₂, ρ ₃, ρ is respectively ζ ₁, ζ ₂, ζ ₃, ζ place and initial point O distance;

K is wave number, f is the frequency of sound, and c is the speed that sound is propagated in air;

θ ₁, θ ₂, θ ₃, θ is respectively ζ ₁, ζ ₂, ζ ₃, ζ place and initial point O the projection of line in XOZ plane and the angle of X-axis;

be respectively ζ ₁, ζ ₂, ζ ₃, ζ place and the line of initial point O and the angle of XOY plane.

According to said method, analogize, obtain each loud speaker in 22.2 channel loudspeaker systems and distribute to the distribution coefficient of 3 loud speakers in corresponding initial 10.2 channel loudspeaker systems, again by the signal stack of each loud speaker duplicate allocation in 10 loud speakers in initial 10.2 channel loudspeaker systems, just obtained the signal of each loud speaker in initial 10.2 channel loudspeaker systems, 2 low frequency audio loudspeaker signals are constant.

In the present embodiment, the calculating of distribution coefficient and loudspeaker signal all can, according to formula (1) and above-mentioned explanation, be brought formula into relevant coordinate and calculate.The present embodiment has only selected a kind of method to describe to mixing the realization of initial n channel loudspeaker system under m channel loudspeaker system, and lower mixed implementation method is not limited to the specified otherwise of embodiment.

Step 2, the obtaining and measuring of relevant parameter.

Keep loudspeaker position constant, the signal of each loud speaker in initial 10.2 channel loudspeaker systems can be obtained to 10.2 new channel loudspeaker systems through adjusting.

This step can be obtained original sound source to the distance of listening the point of articulation from the signals collecting sound field of 22.2 channel loudspeaker systems, also can obtain by other means the original sound source of 22.2 channel loudspeaker systems to the distance of listening between the point of articulation; From 22.2 channel loudspeaker system signals, obtain and listen point of articulation acoustic pressure P ₀press P with left and right otoacoustic emission _l0, P _r0with the particle rapidity V that listens point of articulation place ₀as signal, be sent to initial 10.2 channel loudspeaker system, wherein d ₀, P _l0, P _r0, V ₀all can't harm transmission, wherein d ₀can measure, also can obtain by other means P _l0, P _r0, V ₀can calculate or measure.Measure each loudspeaker distance in initial 10.2 channel loudspeaker systems and listen the distance d of the point of articulation _j(j=1,2 ... 10), measure the distance d of the left auriculare of each loudspeaker distance in initial 10.2 channel loudspeaker systems _lj(j=1,2 ... 10), measure the distance d of each loudspeaker distance auris dextra point in initial 10.2 channel loudspeaker systems _rj(j=1,2 ... 10), measure number of people radius h.

Step 3, transforms to new n channel loudspeaker system signal by initial n channel loudspeaker system signal, obtains equation.

In the present embodiment, initial 10.2 channel loudspeaker system signals are transformed to 10.2 new channel loudspeaker system signals.In conversion process, the loudspeaker position of new and old 10.2 channel loudspeaker systems does not change, the sound field of totally three some place 22.2 sound channel systems is constant with the acoustic pressure of sound of rebuilding sound field to keep listening point of articulation place and left and right ear, listen point of articulation place particle rapidity constant, 2 low frequency audio sound channels do not deal with, as shown in Figure 4,5.The original sound source of 22.2 channel loudspeaker systems is to the distance d listening between the point of articulation ₀with the acoustic image of rebuilding in new 10.2 channel loudspeaker systems to listening the distance of the point of articulation to equate.

The loudspeaker position that is new and old n channel loudspeaker system in conversion process does not change, just guarantee to listen point of articulation place and L, R totally three some place 22.2 sound channel systems sound field with rebuild the sound of sound field acoustic pressure, listen point of articulation place particle rapidity constant, the original sound source of 22.2 channel loudspeaker systems is to the distance d listening between the point of articulation ₀to listening under the equidistant prerequisite of the point of articulation, carry out loudspeaker signal adjustment with the acoustic image of rebuilding in new n sound channel system.

According to these, require available equation to be:

$\left\{\begin{array}{c}{P}_0=P^{\′}\\ P_{L0}=P_{L0}^{\′}\\ P_{R0}=P_{R0}^{\′}\\ V_0=V^{\′}\\ d_0=d\end{array}\right.---\left(2\right)$

Wherein,

P' be in new 10.2 channel loudspeaker systems all loud speakers in the acoustic pressure of listening point of articulation place to produce;

P ' _l0for the acoustic pressure of all loud speakers in 10.2 new channel loudspeaker systems in Zuo Erchu generation;

P ' _r0for the acoustic pressure of all loud speakers in 10.2 new channel loudspeaker systems in the generation of auris dextra place;

V' be in new 10.2 channel loudspeaker systems all loud speakers in the particle rapidity of listening point of articulation place to produce;

D is the acoustic image that in new 10.2 channel loudspeaker systems, all loud speakers produce and the distance of listening point of articulation place;

P ₀represent the pleasant to the ear point of articulation of 22.2 channel loudspeaker system place acoustic pressure;

P _l0represent left auriculare place acoustic pressure in 22.2 channel loudspeaker systems;

P _r0represent auris dextra point place acoustic pressure in 22.2 channel loudspeaker systems;

D ₀represent that the original sound source of 22.2 channel loudspeaker systems is to the distance of listening between the point of articulation;

V ₀represent the pleasant to the ear point of articulation of 22.2 channel loudspeaker system place particle rapidity.

A loud speaker provides a single point sound source, a single point sound source in free field acoustic pressure with measuring point be changed to (assumptions' environment is free field herein, there is no the reflection of sound) apart from sound source distance:

$P_j=\sqrt{\frac{100}{\mathrm{\π}}\frac{W_j}{{d_j}^2}}$

$\left(3\right)$

Wherein,

P _jrefer to the acoustic pressure of measuring point;

D _jrefer to the distance of point sound source and measuring point;

W _jrefer to that point sound source is in the acoustical power of sounding point;

π refers to circumference ratio.

N point sound source in free field acoustic pressure with measuring point being changed to apart from sound source distance:

$P_j=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{W_j}{{d_j}^2}}---\left(4\right)$

W wherein _jrefer to that j point sound source is in the acoustical power of sounding point, j=1,2 ... n.In Fig. 5, ω ₁, ω ₂, ω ₃refer to the signal distribution coefficient of three loud speakers, W ₁, W ₂, W ₃refer to the acoustical power of three loud speakers.

N coordinate is loud speaker, listening the point of articulation the particle rapidity at place is:

Wherein,

S _j(ω) be the signal in loud speaker;

I is imaginary part unit;

K is wave number, f is frequency;

C is the speed that sound is propagated in air;

Coefficient G is the acoustics constant that audio signal is propagated in air.

As shown in Figure 6, this enforcement is owing to choosing L, and the particularity that R is 2, can also increase a constraints to model, and the acoustic image that in 10.2 new channel loudspeaker systems, all loud speakers produce arrives left and right ear apart from d with listening distance d, the acoustic image at point of articulation place _l, d _r, the pass between number of people radius h is:

${2d}^2=d_L^2+d_R^2-{2h}^2---\left(6\right)$

Arrange above-mentioned formula (2) (3) (4) (5) (6) abbreviation, available equation has:

$\left\{\begin{array}{c}{P}_0=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{10}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_j^2}}\\ P_{L0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{10}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Lj}}^2}}\\ P_{R0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{10}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Rj}}^2}}\\ {2d}^2=d_L^2+d_R^2-{2h}^2\\ V_0=G\underset{j=1}{\overset{10}{\mathrm{\Σ}}}\frac{e^{-\mathrm{ik}|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}}{|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}{\mathrm{\ω}}_j{S}_j\left(\mathrm{\ω}\right)\\ d_0=d\end{array}\right.---\left(7\right)$

represent to listen point of articulation position vector, polar coordinates are (0,0,0);

ρ ^jrepresent in initial 10.2 channel loudspeaker systems the distance between j loud speaker position and initial point;

D represents the acoustic image that in 10.2 new channel loudspeaker systems, all loud speakers produce and the distance of listening point of articulation place;

D _lrepresent that the acoustic image of all loud speakers generations in 10.2 new channel loudspeaker systems is to the distance of left ear;

D _rrepresent that the acoustic image of all loud speakers generations in 10.2 new channel loudspeaker systems is to the distance of auris dextra;

D _jrepresent in initial 10.2 channel loudspeaker systems j loud speaker and the distance of listening point of articulation place, j=1,2,3 ... 10;

D _ljrepresent in initial 10.2 channel loudspeaker systems that j loud speaker is to the distance of left ear, j=1,2,3 ... 10;

D _rjrepresent in initial 10.2 channel loudspeaker systems that j loud speaker is to the distance of auris dextra, j=1,2,3 ... 10;

W _jrepresent in initial 10.2 channel loudspeaker systems that j loud speaker is in the acoustical power of sounding point, j=1,2,3 ... 10, while specifically implementing, can calculate by being input to signal and this loud speaker self power of j loud speaker in initial 10.2 channel loudspeaker systems;

ω _jthe signal distribution coefficient that represents j loud speaker, to the weight factor that in initial 10.2 channel loudspeaker systems, each loudspeaker signal is adjusted, j=1,2,3 ... 10;

P ₀represent the pleasant to the ear point of articulation of 22.2 channel loudspeaker system place acoustic pressure;

P _l0represent left auriculare place acoustic pressure in 22.2 channel loudspeaker systems;

P _r0represent auris dextra point place acoustic pressure in 22.2 channel loudspeaker systems;

D ₀represent that the original sound source of 22.2 channel loudspeaker systems is to the distance of listening between the point of articulation;

S _j(ω) be the signal of j loud speaker in initial 10.2 channel loudspeaker systems;

π refers to circumference ratio;

Coefficient G is the acoustics constant that audio signal is propagated in air;

V ₀represent the pleasant to the ear point of articulation of 22.2 channel loudspeaker system place particle rapidity.

Step 4, chooses target function.Because the number of channels adopting in multi-channel system is more, put trouble, in order to facilitate conditioning signal, easy to use, the target function that the present invention adopts is to need the number of channels of adjusting minimum.The weight factor ω of introduction about regulating _ja mapping function:

$f\left({\mathrm{\ω}}_j\right)=\left\{\begin{array}{c}1,{\mathrm{\ω}}_j\≠1\\ 0,{\mathrm{\ω}}_j=1\end{array}\right.---\left(8\right)$

This mapping function formula adds (7) formula as a constraints.Target function expression formula is:

Step 5, solves the minimum value of optimal model M, obtains the weight factor ω that each loudspeaker signal is adjusted _j.In the present embodiment, utilize optimization software Lingo solution procedure 4 to add the minimum value of optimal model M after target functions, obtain the weight factor ω that each loudspeaker signal is adjusted _j, j=1,2,3 ... 10.

Step 6, loudspeaker signal adjustment.In the present embodiment according to solving the weight factor ω obtaining in step 5 _j(j=1,2,3 ... 10) adjust the signal of loud speaker in initial 10.2 sound channel systems, make to rebuild acoustic image and listen the distance of the point of articulation and the original sound source of 22.2 channel loudspeaker systems and listen in the equidistant situation of the point of articulation, need the sound channel of adjusting minimum, object is except guaranteeing to listen the point of articulation, L, R point place acoustic pressure is constant, outside central point particle rapidity is constant, regulates as far as possible quickly and easily multi-channel system.

Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (1)

1. acoustic image range information recovers a portable method of adjustment, it is characterized in that, comprises step:

Step 1, obtains n channel loudspeaker system by mixed under m channel loudspeaker system, and lower mixed gained n channel loudspeaker system is designated as to initial n channel loudspeaker system, m > n, and m >=3;

Step 2, obtaining and measuring of relevant parameter, comprises that the original sound source of obtaining m channel loudspeaker system is to the distance d listening between the point of articulation ₀, from m channel loudspeaker system signal, obtain and listen point of articulation acoustic pressure P ₀press P with left and right otoacoustic emission _l0, P _r0with the particle rapidity V that listens point of articulation place ₀, and be sent to initial n channel loudspeaker system, wherein d ₀, P _l0, P _r0, V ₀all harmless transmission; Measure each loudspeaker distance in initial n channel loudspeaker system and listen the distance d of the point of articulation _j, measure the distance d of the left auriculare of each loudspeaker distance in initial n channel loudspeaker system _lj, measure the distance d of each loudspeaker distance auris dextra point in initial n channel loudspeaker system _rj, j=1,2 ... n; Measure number of people radius h;

Step 3, transforms to new n channel loudspeaker system signal by initial n channel loudspeaker system signal, obtains equation as follows,

$\left\{\begin{array}{c}{P}_0=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_j^2}}\\ P_{L0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Lj}}^2}}\\ P_{R0}=\sqrt{\frac{100}{\mathrm{\π}}\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{{\mathrm{\ω}}_j{W}_j}{d_{\mathrm{Rj}}^2}}\\ {2d}^2=d_L^2+d_R^2-{2h}^2\\ V_0=G\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\frac{e^{-\mathrm{ik}|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}}{|\stackrel{\→}{0}-{\mathrm{\ρ}}^j|}{\mathrm{\ω}}_j{S}_j\left(\mathrm{\ω}\right)\\ d_0=d\end{array}\right.$

represent to listen point of articulation position vector, polar coordinates are (0,0,0);

ρ ^jrepresent in initial n channel loudspeaker system the distance between j loud speaker position and initial point;

D represents the acoustic image that in new n channel loudspeaker system, all loud speakers produce and the distance of listening point of articulation place;

D ₀represent that the original sound source of m channel loudspeaker system is to the distance of listening between the point of articulation;

S _j(ω) be the signal of j loud speaker in initial n channel loudspeaker system;

π refers to circumference ratio;

Coefficient G is the acoustics constant that audio signal is propagated in air;

V ₀represent the m pleasant to the ear point of articulation of channel loudspeaker system place particle rapidity;

D _lrepresent that the acoustic image of all loud speakers generations in new n channel loudspeaker system is to the distance of left ear;

D _rrepresent that the acoustic image of all loud speakers generations in new n channel loudspeaker system is to the distance of auris dextra;

D _jrepresent in initial n channel loudspeaker system j loud speaker and the distance of listening point of articulation place;

D _ljrepresent in initial n channel loudspeaker system that j loud speaker is to the distance of left ear;

D _rjrepresent in initial n channel loudspeaker system that j loud speaker is to the distance of auris dextra;

W _jrepresent in initial n channel loudspeaker system that j loud speaker is in the acoustical power of sounding point;

ω _jexpression is to j the weight factor that loudspeaker signal is adjusted in initial n channel loudspeaker system;

P ₀represent the m pleasant to the ear point of articulation of channel loudspeaker system place acoustic pressure;

P _l0represent left auriculare place acoustic pressure in m channel loudspeaker system;

P _r0represent auris dextra point place acoustic pressure in m channel loudspeaker system;

Step 4, target setting function, adds step 3 gained equation using following mapping function formula as a constraints, obtains optimal model M

$f\left({\mathrm{\ω}}_j\right)=\left\{\begin{array}{c}1,{\mathrm{\ω}}_j\≠1\\ 0,{\mathrm{\ω}}_j=1\end{array}\right.$

Target function expression formula is $M=\min \underset{j=1}{\overset{n}{\mathrm{\Σ}}}f\left({\mathrm{\ω}}_j\right);$

Step 5, solves the minimum value of optimal model M, obtains the weight factor ω that each loudspeaker signal is adjusted _j, j=1,2 ... n;

Step 6, according to solving the weight factor ω obtaining in step 5 _j, j=1,2 ... n, adjusts the signal of each loud speaker in initial n channel loudspeaker system, obtains new n channel loudspeaker system.