CN103220601A - Method for reducing and streamlining three-dimensional multiple sound channel audio system speaker group by half - Google Patents

Abstract

The invention discloses a method for reducing and streamlining a three-dimensional multiple sound channel audio system speaker group by half. Mirror images are arranged to be symmetrical according to original speakers, and n speakers in a three-dimensional n sound channel audio system are streamlined into m speakers in a three-dimensional m sound channel audio system by means of half-reducing method. The method for reducing and streamlining the three-dimensional multiple sound channel audio system speaker group by half comprises the following steps: obtaining spatial location information of each speaker in the three-dimensional n sound channel audio system before half reduction and streamlining; reducing the speakers in the three-dimensional n sound channel audio system by half before the streamlining by means of the symmetrical surface, and obtaining original objects to be streamlined; conducting mirror image allocation on the speakers; analyzing all combinations of a triangular speaker group in objects to be streamlined, and analyzing speakers, obtaining speakers and rejecting speakers which should be streamlined; and rejecting mirror image points of the rejected streamlined speakers, judging whether the sum of the current speakers to be streamlined is larger than m, wherein a simplification process is continuously executed if the sum of the current speakers to be streamlined is larger than an-m, otherwise, iteration is finished, and obtaining optimal spatial location distribution of the m sound channel streamlined system speaker group.

Description

A kind of three-dimensional multichannel audio system speaker group compressing method that reduces by half

Technical field

The invention belongs to field of acoustics, relate in particular to a kind of three-dimensional multichannel audio system speaker group compressing method that reduces by half.

Background technology

The three-dimensional movie of showing for the end of the year 2009 " A Fanda " is not only climbed up top box-office value in more than 30 country in the whole world, and at the beginning of 2010 9 months, global box office accumulative total is above 2,700,000,000 dollars.Gorgeous picture and sound effect true to nature that " A Fanda " represented have not only shaken spectators, also make industry that asserting of " film entering the three-dimensional epoch " arranged.The International CES of holding in Las Vegas in 2013 (CES) is gone up the data that obtain and is shown, global 3D TV sales volume increased by 67% than previous year in 2012, and wherein the sales volume in market, China's Mainland is 1,000 ten thousand, accounts for 25% of global 3D TV sales volume; The well-known iSuppli of market research agency in the whole world predicted 2015, and the shipment amount of global 3D television set will reach 1.59 hundred million, account for the over half of global panel TV set shipment amount." 3D " become the significant symbol of 21st century second 10 years global multimedia industry undoubtedly.But want to reach better audiovisual experience, need the three-dimensional sound field auditory effect synchronous, could really reach audiovisual impression on the spot in person with 3 d video content.Therefore, the scientific research institution of advanced country and main multimedia standardization tissue are carried out correlative study one after another in the world: early stage three dimensional audio systems (as the Ambisonics system) is because its complex structure, collection and playback apparatus are had relatively high expectations, be difficult to promote practical; Doby company (Dolby) has released and has had the ProLogic IIz multisound path three dimensional audio playback system that height is put sound channel; 22.2 multichannel audio prototype systems have been developed in NHK (NHK) scientific and technical research laboratory in recent years, and it is simple in structure, and the compatible 5.1 surround sound speaker configurations schemes of energy; (the Moving Pictures Experts Group of dynamic image expert group, MPEG) great attention has also started the formulation of 3D Audiotechnica standard in 2011, hope can be reduced three-dimensional sound field by fewer loud speaker or earphone when reaching certain code efficiency, so that can be with this technology popularization to the ordinary family user; China state natural sciences fund committee has issued " three-dimensional audio basic theory and key technology research " primary study project guide specially in 2012, emphasis is supported the research of 3D Audiotechnica.This shows that three-dimensional audio frequency and video technology has become the research focus of multimedia technology field and the important directions that further develops.Meanwhile, the thought of traditional sound field rebuilding technology (as WFS, Ambisonics etc.) is that one is rebuild in another space as the formed sound field of music hall live concerts, and its target is original sound fields such as reproduction music hall scene.But be subjected to the restriction of actual sound field acquisition method, the target of rebuilding original sound field fully is difficult to realize.Yet, the reconstruction once more of the reconstruction sound field that generates by multi-channel system in the MIXING STUDIO being rebuild sound field in another indoor environment then realizes than being easier to, and this problem of rebuilding sound field in other environment once more can be equivalent to looks for a kind of method and multi-channel audio signal in the former reconstruction sound field is converted to rebuilds multi-channel audio signal in the sound field once more.Describe for convenient, generally will be called " original sound field ", and the sound field that the alternate audio system by different channel number rebuilds once more is called " reconstruction sound field " by the reconstruction sound field that former multi-channel system obtains.

The conventional audio technology promotes simplified system by the apperceive characteristic that utilizes people's ear audition when signal being gathered, encoding and play: as when sound is gathered, according to Nyquist's theorem, sample frequency should be could unaware distortion ground reduction primary signal more than the twice of people's ear perceives sound highest frequency; When signal is encoded, removed the perception redundancy in the sound channel according to the masking effect of people's ear, utilize people's ear that the perception sensitivity characteristic of spatial parameter has been removed parameter perception redundancy between sound channel; At the playback end, relatively more responsive according to people's ear to the location, dead ahead, to the more sensitive characteristic of ambient sound perception at rear, adopt in the dead ahead and place the main sound channel loud speaker that is used to locate, place the arrangement mode of ambient sound loud speaker in the wings.Because people's ear is symmetrical to the perception of left and right directions, therefore need a kind of method of design can simplify former multi-channel system set of speakers, can guarantee to rebuild sound field and original sound field error minimum again, guarantee left-right symmetric simultaneously.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, provide a kind of n loud speaker in the three-dimensional n channel audio system simplified compressing method by half into m loud speaker in the three-dimensional m channel audio system, obtain to simplify set of speakers optimal spatial positional information in the symmetrical m sound channel system in back.

Technical scheme of the present invention is a kind of three-dimensional multichannel audio system speaker group compressing method that reduces by half, and is used for the three-dimensional n channel audio n of a system loud speaker simplified by half being m loud speaker in the three-dimensional m channel audio system, comprises following steps:

Step 1 is obtained before simplifying the luv space positional information of each loud speaker in the three-dimensional n channel audio system;

Step 2, getting the loud speaker that is positioned at the loud speaker of a certain side of the plane of symmetry in the three-dimensional n channel audio system before simplifying and is positioned on the plane of symmetry is initial object to be simplified;

Step 3 is made mirror image to initial object to be simplified, and obtains corresponding mirror image loud speaker;

Step 4 is analyzed current all combinations of waiting to simplify spherical triangle set of speakers in the object, constitutes spherical triangle set of speakers S set;

Step 5 according to step 4 gained spherical triangle set of speakers S set, is therefrom selected the set of speakers that only comprises single loud speaker, gets the set of speakers (ξ of spherical triangle area minimum then ₁, ξ ₂, ξ ₃), redistribute set of speakers (ξ ₁, ξ ₂, ξ ₃) signal, with set of speakers (ξ ₁, ξ ₂, ξ ₃) the single loud speaker ζ that comprised rejects as the loud speaker of being simplified;

Step 6 is redistributed step 5 gained set of speakers (ξ ₁, ξ ₂, ξ ₃) the mirror image set of speakers (ξ ' ₁, ξ ' ₂, ξ ' ₃) signal, reject and to be simplified the mirror image loud speaker ζ ' of loud speaker;

Step 7, judge and currently wait to simplify loud speaker and whether count sum greater than default m value, if greater than m, changing execution in step 4 over to reanalyses and currently waits to simplify in the object all combinations of spherical triangle set of speakers and simplify, otherwise finishing iteration, according to remaining loud speaker, obtain the symmetrical system speaker group optimal spatial position of simplifying of m sound channel and arrange.

And, redistribute set of speakers (ξ in the step 5 ₁, ξ ₂, ξ ₃) signal, implementation is as follows,

According to loud speaker ζ and ξ ₁, ξ ₂, ξ ₃Spatial positional information

Calculate weights distribution coefficient ω ₁, ω ₂, ω ₃It is as follows,

$w_1=\frac{{\tilde{D}}_1}{D},$ $w_2=\frac{{\tilde{D}}_2}{D},$ $w_3=\frac{{\tilde{D}}_3}{D}$

$D={\tilde{D}}_1+{\tilde{D}}_2+{\tilde{D}}_3$

Frequency-region signal s with loud speaker ζ _ζ(ω) according to weights distribution coefficient ω ₁, ω ₂, ω ₃Be assigned to loud speaker ξ ₁, ξ ₂, ξ ₃Frequency-region signal

On, obtain new frequency-region signal Formula is as follows,

$q_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)+w_1{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)+w_2{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)+w_3{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

Make s at last _ζ(ω)=0.

And, redistribute in the step 6 the mirror image set of speakers (ξ ' ₁, ξ ' ₂, ξ ' ₃) signal, implementation is as follows,

Frequency-region signal s with mirror image loud speaker ζ ' _{ζ '}(ω) according to weights distribution coefficient ω ₁, ω ₂, ω ₃Be assigned to loud speaker ξ ' ₁, ξ ' ₂And ξ ' ₃Frequency-region signal

On, obtain new frequency-region signal

Formula is as follows,

$q_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)+w_1{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)+w_2{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)+w_3{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

Make s at last _{ζ '}(ω)=0.

Adopt split provided by the invention to simplify three-dimensional multichannel audio system speaker, collection waits to simplify the spatial positional information of loud speaker in the three-dimensional multichannel audio system, because of loud speaker is left and right sides mirror image symmetry, simplify in the process, in demifacet, seek and to reject loud speaker, and it and it mirror point is together rejected.Simplify through set of speakers and can obtain simplifying the configuration of system speaker group optimal spatial behind the iterative algorithm, finally realize that three-dimensional multichannel audio system is simplified the loud speaker optimal spatial to arrange.Set of speakers is simplified iterative algorithm can guarantee that the process of simplifying does not influence the physical characteristic of the sound of audition central spot.Be compared to the whole loud speaker of waiting to simplify in the three-dimensional multichannel audio system is sought and should be rejected the way of loud speaker, the efficient of technical solution of the present invention is than higher, and the work of treatment amount reduces, conserve system resources.

Description of drawings

Fig. 1 is the set of speakers of the embodiment of the invention compressing method flow chart that reduces by half.

Fig. 2 is the loud speaker mirror image distribution map before the set of speakers of the embodiment of the invention is simplified by half.

Embodiment

The invention provides provides a kind of n loud speaker in the three-dimensional n channel audio system is simplified compressing method by half into m loud speaker in the three-dimensional m channel audio system.During concrete enforcement, can select suitable weight calculation method and the best to be simplified the loud speaker system of selection as required by those skilled in the art.

Technical solution of the present invention can adopt computer software technology to realize operation automatically, describes technical solution of the present invention in detail below in conjunction with drawings and Examples, and those skilled in the art are not limited to this technical scheme when implementing.

Provided the flow chart of the embodiment of the invention as Fig. 1, embodiment comprises following steps:

Step 1 is gathered before simplifying the spatial positional information of each loud speaker in the three-dimensional n channel audio system;

Three-dimensional n channel audio system is to there being n loud speaker, if with listening area central point O is summit structure three-dimensional system of coordinate XYZ, distance between loud speaker and the central point is designated as ρ, and the angle of loud speaker and plane X OZ is designated as θ, and the angle of loud speaker and plane X OY is designated as

The speaker volume location parameter is labeled as

N loud speaker be arranged in and central point between distance on the sphere of ρ, the value of establishing ρ among the embodiment is 2 meters.Because in the reconstruction sound field between loud speaker and the central point in distance and the original sound field loud speaker equate with the central point distance, simplify that the simplification of speaker volume location parameter is labeled as in the preceding audio system so gather in an embodiment

Make initial waiting simplify loud speaker and count sum=n.

Step 2 obtains initial object to be simplified by half to loud speaker in the three-dimensional n channel audio system before simplifying;

Loud speaker before simplifying in the three-dimensional n channel audio system is symmetrically distributed.With the XOZ face is the plane of symmetry, gets the loud speaker of a side (left side or right side) and is positioned at loud speaker on the plane of symmetry, forms object to be simplified.

As Fig. 2, the mirror image of simplifying preceding 22 loud speakers distributes.Horizontal shading face XOY is a listening area, and vertical shading face XOZ is the plane of symmetry, and black real point loud speaker is initial object to be simplified on the desirable plane of symmetry left side black real point loud speaker (or the hollow loud speaker of right side black) and the plane of symmetry.

Step 3 is made mirror image to initial object to be simplified;

Each waits to simplify object is this mirror image of waiting to simplify object about the symmetric position place loud speaker of plane of symmetry XOZ face, loud speaker mirror image on the plane of symmetry is itself, with first behavior object to be simplified, second behavior waits to simplify the mirror image of object accordingly, constitutes the mirror image matrix A.The θ addition of the two-loudspeaker of mirror image symmetry and be the odd-multiple of π, and elevation angle Equate.

For example, three loud speaker ξ of XOZ left side of face ₁, ξ ₂And ξ ₃The locus be

Three loud speaker ξ ' of XOZ right side of face ₁, ξ ' ₂And ξ ' ₃The locus be

If θ ₁+ θ ' ₁=(2n+1) π, n=0 wherein, 1,2..., then ξ ₁And ξ ' ₁The mirror image symmetry.In like manner if ξ ₂And ξ ' ₂, ξ ₃And ξ ' ₃Satisfy similarity condition, then ξ ₂And ξ ' ₂, ξ ₃And ξ ' ₃Also be the mirror image symmetry.More the situation of multi-loudspeaker in like manner.

Mirror image matrix then $A=\left[\begin{array}{cccc}{\mathrm{\ξ}}_1& {\mathrm{\ξ}}_2& {\mathrm{\ξ}}_3& \·\·\·\\ {\mathrm{\ξ}}_1^{\′}& {\mathrm{\ξ}}_1^{\′}& {\mathrm{\ξ}}_1^{\′}& \·\·\·\end{array}\right]$

Step 4 is analyzed all combinations that object intermediate cam shape set of speakers is simplified in current waiting;

In waiting to simplify the loud speaker of object, analyze all speaker combination that can constitute spherical triangle in all combinations of optional three, constitute spherical triangle set of speakers S set;

For example, from the loud speaker in the left side of n loud speaker, select three arbitrarily and constitute a speaker combination (ξ ₁, ξ ₂, ξ ₃), can obtain three loud speaker ξ ₁, ξ ₂And ξ ₃The locus be

Because camber line could be with the pairing locus point formation of these three loud speakers spherical triangle, so if wish speaker combination (ξ altogether simultaneously for three speaker volume positions only in this speaker combination ₁, ξ ₂, ξ ₃) can then must satisfy θ as a spherical triangle set of speakers ₁, θ ₂And θ ₃Do not equate simultaneously or

With

Do not equate simultaneously.

Step 5 obtains the loud speaker that should be simplified and rejects according to the analysis result of step 4;

From above-mentioned S set, select the spherical triangle set of speakers that only comprises single loud speaker, and sort, form set Q by the spherical triangle area size of its composition; Find the set of speakers (ξ of spherical triangle area minimum then ₁, ξ ₂, ξ ₃) the single loud speaker ζ that comprised, redistribute signal; Reject loud speaker ζ at last, i.e. distributing signal s _ζ(ω)=0, make and currently wait to simplify loud speaker and count sum=sum-1.Can from spherical triangle set of speakers S set, reject the spherical triangle set of speakers element relevant with loud speaker ζ.

For example:

The set of speakers of spherical triangle area minimum is (ξ among the set Q ₁, ξ ₂, ξ ₃), the single loud speaker that is wherein comprised is ζ, the locus coordinate

Constituting by three speaker volume on spherical triangle intra-zone or three limits at spherical triangle.

With loud speaker ξ ₁, ξ ₂, ξ ₃Obtain corresponding frequency-region signal with the time-domain signal of ζ through Fourier transform

And s _ζ(ω), when the spatial positional information of known loudspeaker:

Calculating weights according to formula 1 distributes.

$w_1=\frac{{\tilde{D}}_1}{D},$ $w_2=\frac{{\tilde{D}}_2}{D},$ $w_3=\frac{{\tilde{D}}_3}{D}$ Formula (1)

Wherein: ω ₁, ω ₂, ω ₃Be the weights distribution coefficient, wherein parameter D,

Computing formula as follows:

$D={\tilde{D}}_1+{\tilde{D}}_2+{\tilde{D}}_3$

According to formula (2), the frequency-region signal of loud speaker ζ is assigned to loud speaker ξ according to the corresponding weight value size ₁, ξ ₂, ξ ₃Frequency-region signal on, obtain loud speaker ξ ₁, ξ ₂, ξ ₃New frequency-region signal

$q_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)+w_1{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)+w_2{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)+w_3{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$ Formula (2)

Make s at last _ζ(ω)=0

With loud speaker ξ ₁, ξ ₂, ξ ₃Frequency-region signal be corresponding time-domain signal through inverse Fourier transform, from spherical triangle set of speakers S set, reject the spherical triangle set of speakers element relevant with loud speaker ζ.

Step 6 is rejected the mirror image loud speaker of being simplified loud speaker;

According to the mirror image matrix A, find the mirror image loud speaker ζ ' of disallowable loud speaker ζ in the step 5, and 5 same method distributing signals set by step, reject mirror image loud speaker ζ '.Make and currently wait to simplify loud speaker and count sum=sum-1.Can from spherical triangle set of speakers S set, reject the spherical triangle set of speakers element relevant, obtain remaining loud speaker number, promptly new currently wait to simplify loud speaker and count sum with loud speaker ζ '.

For example, disallowable loud speaker is ζ in the step 5, and step 6 is item according to matrix A, and obtaining its mirror image loud speaker is ζ ', and the element of corresponding smallest triangle set of speakers is ξ ' ₁, ξ ' ₂And ξ ' ₃, with loud speaker ξ ' ₁, ξ ' ₂And ξ ' ₃And the time-domain signal of ζ ' obtains corresponding frequency-region signal through Fourier transform

And s _{ζ '}(3) distribution (ω), by formula obtains loud speaker ξ ' ₁, ξ ' ₂And ξ ' ₃New frequency-region signal

$q_{{\mathrm{\ξ}}_1^{\′}}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1^{\′}}\left(\mathrm{\ω}\right)+w_1{s}_{{\mathrm{\ζ}}^{\′}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2^{\′}}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2^{\′}}\left(\mathrm{\ω}\right)+w_2{s}_{{\mathrm{\ζ}}^{\′}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3^{\′}}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3^{\′}}\left(\mathrm{\ω}\right)+w_3{s}_{{\mathrm{\ξ}}^{\′}}\left(\mathrm{\ω}\right)$ Formula (3)

Make s at last _{ζ '}(ω)=0, reject mirror image loud speaker ζ '.

Wherein, weights distribution coefficient ω ₁, ω ₂, ω ₃Directly adopt step 5 gained result to get final product.

Step 7, iterated conditional is judged;

Judge and currently wait to simplify loud speaker and whether count sum greater than m,

If greater than m, change execution in step 4 over to and reanalyse all combinations that object intermediate cam shape set of speakers is simplified in current the waiting of analysis, continue to simplify based on new spherical triangle set of speakers S set;

Otherwise finishing iteration, the spatial positional information of the pairing loud speaker of each spherical triangle set of speakers element and its corresponding mirror image loud speaker obtains the symmetrical system speaker group optimal spatial position of simplifying of m sound channel and arranges in the taking-up spherical triangle set of speakers S set.

During concrete enforcement, the value of m can be set in advance according to the distribution situation of n loud speaker in the three-dimensional n channel audio system by those skilled in the art.

Be compared to the whole loud speaker of waiting to simplify in the three-dimensional multichannel audio system is sought and should be rejected the way of loud speaker, the efficient of technical solution of the present invention is than higher, and the work of treatment amount reduces, conserve system resources.

For example, 22 sound channels are simplified when being 8 sound channels, before the whole loud speaker of waiting to simplify in the three-dimensional multichannel audio system is sought the way data processing time t that should reject loud speaker ₁Be approximately 79.354936, and the data processing time t of technical solution of the present invention ₂Be about 18.925047.

(t ₁-t ₂)÷t ₁＝(79.354936-18.925047)÷79.354936≈0.76

So, being compared to the whole loud speaker of waiting to simplify in the three-dimensional multichannel audio system is sought and should be rejected the way of loud speaker, the efficient of technical solution of the present invention has improved about 0.6 times.

Specific embodiment described herein only is that the present invention's spirit is illustrated.The technical staff of the technical field of the invention can make various modifications or replenishes 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 (3)

1. three-dimensional multichannel audio system speaker group compressing method that reduces by half is used for the three-dimensional n channel audio n of a system loud speaker simplified by half and is m loud speaker in the three-dimensional m channel audio system, and its characteristic is, comprises following steps:

Step 1 is obtained before simplifying the luv space positional information of each loud speaker in the three-dimensional n channel audio system;

Step 2, getting the loud speaker that is positioned at the loud speaker of a certain side of the plane of symmetry in the three-dimensional n channel audio system before simplifying and is positioned on the plane of symmetry is initial object to be simplified;

Step 3 is made mirror image to initial object to be simplified, and obtains corresponding mirror image loud speaker;

Step 4 is analyzed current all combinations of waiting to simplify spherical triangle set of speakers in the object, constitutes spherical triangle set of speakers S set;

Step 5 according to step 4 gained spherical triangle set of speakers S set, is therefrom selected the set of speakers that only comprises single loud speaker, gets the set of speakers (ξ of spherical triangle area minimum then ₁, ξ ₂, ξ ₃), redistribute set of speakers (ξ ₁, ξ ₂, ξ ₃) signal, with set of speakers (ξ ₁, ξ ₂, ξ ₃) the single loud speaker ζ that comprised rejects as the loud speaker of being simplified;

Step 6 is redistributed step 5 gained set of speakers (ξ ₁, ξ ₂, ξ ₃) the mirror image set of speakers (ξ ' ₁, ξ ' ₂, ξ ' ₃) signal, reject and to be simplified the mirror image loud speaker ζ ' of loud speaker;

Step 7, judge and currently wait to simplify loud speaker and whether count sum greater than default m value, if greater than m, changing execution in step 4 over to reanalyses and currently waits to simplify in the object all combinations of spherical triangle set of speakers and simplify, otherwise finishing iteration, according to remaining loud speaker, obtain the symmetrical system speaker group optimal spatial position of simplifying of m sound channel and arrange.

2. the three-dimensional according to claim 1 multichannel audio system speaker group compressing method that reduces by half is characterized in that: redistribute set of speakers (ξ in the step 5 ₁, ξ ₂, ξ ₃) signal, implementation is as follows,

According to loud speaker ζ and ξ ₁, ξ ₂, ξ ₃Spatial positional information

Calculate weights distribution coefficient ω ₁, ω ₂, ω ₃It is as follows,

$w_1=\frac{{\tilde{D}}_1}{D},$ $w_2=\frac{{\tilde{D}}_2}{D},$ $w_3=\frac{{\tilde{D}}_3}{D}$

$D={\tilde{D}}_1+{\tilde{D}}_2+{\tilde{D}}_3$

Frequency-region signal s with loud speaker ζ _ζ(ω) according to weights distribution coefficient ω ₁, ω ₂, ω ₃Be assigned to loud speaker ξ ₁, ξ ₂, ξ ₃Frequency-region signal

On, obtain new frequency-region signal Formula is as follows,

$q_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)+w_1{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)+w_2{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)+w_3{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

Make s at last _ζ(ω)=0.

3. as the compressing method that reduces by half of three-dimensional multichannel audio system speaker group as described in the claim 2, it is characterized in that: redistribute in the step 6 the mirror image set of speakers (ξ ' ₁, ξ ' ₂, ξ ' ₃) signal, implementation is as follows,

Frequency-region signal s with mirror image loud speaker ζ ' _{ζ '}(ω) according to weights distribution coefficient ω ₁, ω ₂, ω ₃Be assigned to loud speaker ξ ' ₁, ξ ' ₂And ξ ' ₃Frequency-region signal

On, obtain new frequency-region signal

Formula is as follows,

$q_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_1}\left(\mathrm{\ω}\right)+w_1{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_2}\left(\mathrm{\ω}\right)+w_2{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

$q_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)=s_{{\mathrm{\ξ}}_3}\left(\mathrm{\ω}\right)+w_3{s}_{\mathrm{\ζ}}\left(\mathrm{\ω}\right)$

Make s at last _{ζ '}(ω)=0.

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