CN109618275A

CN109618275A - Non-central sound field rebuilding method, equipment, storage medium and the device of multichannel

Info

Publication number: CN109618275A
Application number: CN201811653704.3A
Authority: CN
Inventors: 王松
Original assignee: Wuhan Polytechnic University
Current assignee: Wuhan Zhuoyue Audio Visual Technology Co.,Ltd.
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2019-04-12
Anticipated expiration: 2038-12-29
Also published as: CN109618275B

Abstract

The invention discloses non-central sound field rebuilding method, equipment, storage medium and the devices of multichannel.The default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual point in the present invention, the first virtual acoustic pressure that the virtual speaker at virtual point generates at non-central point is determined again, the default reconstruction acoustic pressure for rebuilding loudspeaker at non-central point is determined according to the first virtual acoustic pressure, and reconstruction distribution coefficient is determined according to acoustic pressure is rebuild, reconstruction acoustical signal to be output at default reconstruction loudspeaker is determined according to distribution coefficient is rebuild, to rebuild sound field.The central point to preset original sound field is different to rebuild in a manner of the sound field rebuilding of sound field, the present invention had both realized for non-central point and has constructed sound field, the sound field quality for rebuilding sound field is also improved simultaneously, solves the second-rate technical problem of the sound field of the sound field reconstructed at non-central listening point.

Description

Non-central sound field rebuilding method, equipment, storage medium and the device of multichannel

Technical field

The present invention relates to non-central sound field rebuilding method of three dimensional audio technology field more particularly to multichannel, equipment, Storage medium and device.

Background technique

With the continuous development of virtual reality (Virtual Reality, VR) technology, three dimensional audio technology is increasingly becoming The key technology for bringing immersion to experience to user.This is because, it is contemplated that human ear is based on three for the perception characteristics of sound The sound rendering that dimension Audiotechnica can issue multiple loudspeakers is a virtual sound source, to bring the body of location sound It tests.

And in order to reach the experience of above-mentioned location sound, it needs to reconstruct the sound met the requirements by sound field rebuilding technology Field space.For example, can be weighed based on vector base amplitude phase shift (Vector Based Amplitude Panning, VBAP) technology Sound field is built, specifically, this kind of sound field rebuilding mode will first determine a sphere center position, then the physical bit of multiple loudspeakers is installed It is placed on the same spherical surface of the centre of sphere, so that the sound rendering of multiple loudspeakers output is a virtual sound source, and guarantees The acoustic pressure and particle rapidity that the virtual sound source generates at the centre of sphere, that is, center listening point are with multiple loudspeakers at the listening point of center The acoustic pressure and particle rapidity of generation are equal, in this way, completing the reconstruction of sound field, just also to achieve the purpose that sound positions.

It should be apparent, however, that it is limited to the technical restriction of VBAP technology itself when according to VBAP technology to rebuild sound field, Defining will be to rebuild sound field at the centre of sphere i.e. center listening point.If VBAP technology is intended to for rebuilding sound at non-central listening point , it is poor to rebuild effect.

So, it is believed that there is the second-rate technical problems of the sound field of the sound field reconstructed at non-central listening point.

Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill Art.

Summary of the invention

The main purpose of the present invention is to provide non-central sound field rebuilding method of multichannel, equipment, storage medium and Device, it is intended to solve the second-rate technical problem of the sound field of the sound field reconstructed at non-central listening point.

To achieve the above object, the present invention provides a kind of non-central sound field rebuilding method of multichannel, the multichannel Non-central sound field rebuilding method the following steps are included:

When receiving sound field rebuilding instruction, according to sound field rebuilding instruction determine non-central point location information and For constructing the original sound signals for presetting original sound field, the location information of the non-central point is preset in original sound field with described Center audition dot position information is different；

The default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual point, it is described pre- If virtual spherical surface is using the non-central point as the centre of sphere；

According to the sound field quality for presetting original sound field determine the virtual speaker at the virtual point it is described it is non-in The the first virtual acoustic pressure generated at heart point；

Determine the default reconstruction loudspeaker described by default acoustic pressure reconstruction model according to the described first virtual acoustic pressure Reconstruction acoustic pressure at non-central point, and according to the determining reconstruction distribution corresponding with the default reconstruction loudspeaker of the reconstruction acoustic pressure Coefficient；

It is to be output at the default reconstruction loudspeaker according to the original sound signals and reconstruction distribution coefficient determination Reconstruction acoustical signal, to rebuild sound field centered on the non-central point by exporting the acoustical signal of rebuilding.

Preferably, described that the default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as void Before quasi- point, non-central sound field rebuilding method of the multichannel further include:

Calculate the distance between the non-central point and default original ones；

Building is the centre of sphere and using the distance as the default virtual spherical surface of radius using the non-central point.

Preferably, described that the default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as void After quasi- point, non-central sound field rebuilding method of the multichannel further include:

Determine that the original sound signals generate original at the non-central point by presetting original acoustic pressure calculation formula Acoustic pressure；

Determine what the original sound signals generated at the non-central point by default predecessor speed calculation formula Predecessor speed；

Correspondingly, described that virtual speaker at the virtual point is determined according to the sound field quality for presetting original sound field The the first virtual acoustic pressure generated at the non-central point, comprising:

In presetting virtual sound field reconstruction model according to the original acoustic pressure and the predecessor speed it is determining with it is described The corresponding virtual assigned coefficient of virtual speaker at virtual point；

The original sound signals and the virtual assigned coefficient are preset into virtual acoustic pressure calculation formula by first and determine institute State the first virtual acoustic pressure that virtual speaker generates at the non-central point.

It is preferably, described that preset virtual sound field reconstruction model include second presetting virtual acoustic pressure calculation formula and default virtual Particle rapidity calculates formula；

It is described in presetting virtual sound field reconstruction model according to the original acoustic pressure and the predecessor speed determine with The corresponding virtual assigned coefficient of virtual speaker at the virtual point, comprising:

Presetting virtual acoustic pressure calculation formula by described second determines virtual speaker at the virtual point described non- The second virtual acoustic pressure that center generates；

Determine that the virtual speaker produces at the non-central point by the default virtual particle speed calculation formula Raw virtual particle speed；

According to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and virtual particle speed Degree determines virtual assigned coefficient corresponding with the virtual speaker.

Preferably, described according to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and described Virtual particle speed determines virtual assigned coefficient corresponding with the virtual speaker, comprising:

The first virtual assigned coefficient corresponding with the described second virtual acoustic pressure is determined according to the original acoustic pressure；

The second virtual assigned coefficient corresponding with the virtual particle speed is determined according to the predecessor speed；

The determining and virtual speaker pair in the first virtual assigned coefficient and the second virtual assigned coefficient The virtual assigned coefficient answered.

Preferably, the default acoustic pressure reconstruction model includes that default reconstruction acoustic pressure calculation formula and default acoustic pressure keep public Formula；

It is described to determine that the default reconstruction loudspeaker exists by default acoustic pressure reconstruction model according to the described first virtual acoustic pressure Reconstruction acoustic pressure at the non-central point, and according to the determining reconstruction corresponding with the default reconstruction loudspeaker of the reconstruction acoustic pressure Distribution coefficient, comprising:

Determine that the default reconstruction loudspeaker produces at the non-central point by the default reconstruction acoustic pressure calculation formula Raw reconstruction acoustic pressure to be chosen；

Formula is kept to choose and the described first virtual acoustic pressure described wait choose to rebuild in acoustic pressure by the default acoustic pressure Corresponding Object reconstruction acoustic pressure, and divided according to determining rebuild corresponding with the default reconstruction loudspeaker of the Object reconstruction acoustic pressure Distribution coefficient.

Preferably, it is more than or equal to for exporting the original ones quantity of the default original ones of the original sound signals 2；

Described determined according to the original sound signals with the reconstruction distribution coefficient is waited at the default reconstruction loudspeaker The reconstruction acoustical signal of output, by exporting the sound field for rebuilding acoustical signal reconstruction centered on the non-central point, comprising:

It is to be output at the default reconstruction loudspeaker according to the original sound signals and reconstruction distribution coefficient determination Reconstruction acoustical signal；

Number of signals reconstruction acoustical signal corresponding with the original ones quantity is overlapped, to obtain sound to be output Signal, and by exporting sound field of the acoustical signal reconstruction to be output centered on the non-central point.

In addition, to achieve the above object, the present invention also proposes a kind of audio frequency apparatus, the audio frequency apparatus include memory, Processor and non-central sound field rebuilding journey for being stored in the multichannel that can be run on the memory and on the processor Non-central sound field rebuilding program of sequence, the multichannel is arranged for carrying out non-central sound field of multichannel as described above The step of method for reconstructing.

In addition, to achieve the above object, the present invention also proposes a kind of storage medium, more sound are stored on the storage medium The non-central sound field rebuilding program in road is realized such as when non-central sound field rebuilding program of the multichannel is executed by processor The step of non-central sound field rebuilding method of multichannel described above.

In addition, to achieve the above object, the present invention also proposes a kind of non-central sound field rebuilding device of multichannel, described Non-central sound field rebuilding device of multichannel include:

Non-central determining module, for being instructed and being determined according to the sound field rebuilding when receiving sound field rebuilding instruction The location information of non-central point and for constructing the original sound signals for presetting original sound field, the location information of the non-central point It is different from the center audition dot position information preset in original sound field；

Virtual speaker determining module, for the default location point for rebuilding loudspeaker to be mapped on default virtual spherical surface Umbilical point is as virtual point, and the default virtual spherical surface is using the non-central point as the centre of sphere；

Virtual acoustic pressure generation module, for being determined at the virtual point according to the sound field quality for presetting original sound field The first virtual acoustic pressure that virtual speaker generates at the non-central point；

Reconstructed coefficients determining module, described in being determined according to the described first virtual acoustic pressure by default acoustic pressure reconstruction model The default reconstruction acoustic pressure for rebuilding loudspeaker at the non-central point, and according to reconstruction acoustic pressure determination and the default reconstruction The corresponding reconstruction distribution coefficient of loudspeaker；

Sound field rebuilding module, for being determined according to the original sound signals and the reconstruction distribution coefficient in the default weight Reconstruction acoustical signal to be output at loudspeaker is built, to rebuild centered on the non-central point by exporting the reconstruction acoustical signal Sound field.

The default location point for rebuilding loudspeaker is first mapped to the umbilical point on default virtual spherical surface as void in the present invention Quasi- point, then determine the first virtual acoustic pressure that the virtual speaker at virtual point generates at non-central point, according to the first Virtual Sound It presses and determines the default reconstruction acoustic pressure for rebuilding loudspeaker at non-central point by presetting acoustic pressure reconstruction model, and according to reconstruction acoustic pressure It is determining to rebuild the corresponding reconstruction distribution coefficient of loudspeaker with default, according to original sound signals and the reconstruction distribution coefficient it is determining to The reconstruction acoustical signal of output, to rebuild sound field.It is different from and rebuilds the sound field rebuilding of sound field to preset the central point of original sound field Mode, the acoustic pressure that the present invention will determine that virtual speaker is generated based on the sound field quality for presetting original sound field, then based on virtual The acoustic pressure that loudspeaker generates determines the acoustic pressure of the reconstructions acoustical signal of reality output, has also determined that reconstruction sound to be output is believed Number, it had both realized for non-central point and has constructed sound field, while having also improved the sound field quality for rebuilding sound field, solved non-central The second-rate technical problem of the sound field of the sound field reconstructed at listening point.

Detailed description of the invention

Fig. 1 is the audio frequency apparatus structural schematic diagram for the hardware running environment that the embodiment of the present invention is related to；

Fig. 2 is the flow diagram of non-central sound field rebuilding method first embodiment of multichannel of the present invention；

Fig. 3 is the position view of loudspeaker of the present invention；

Fig. 4 is the flow diagram of non-central sound field rebuilding method second embodiment of multichannel of the present invention；

Fig. 5 is the flow diagram of non-central sound field rebuilding method 3rd embodiment of multichannel of the present invention；

Fig. 6 is the structural block diagram of non-central sound field rebuilding device first embodiment of multichannel of the present invention.

The object of the invention is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.

Specific embodiment

It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.

Referring to Fig.1, Fig. 1 is the audio frequency apparatus structural schematic diagram for the hardware running environment that the embodiment of the present invention is related to.

As shown in Figure 1, the audio frequency apparatus may include: processor 1001, such as CPU, communication bus 1002, user interface 1003, network interface 1004, memory 1005.Wherein, communication bus 1002 is for realizing the connection communication between these components. User interface 1003 may include display screen (Display), optional user interface 1003 can also include standard wireline interface, Wireless interface, the wireline interface for user interface 1003 can be USB interface in the present invention.Network interface 1004 optionally may be used To include standard wireline interface and wireless interface (such as WI-FI interface).Memory 1005 can be high speed RAM memory, can also To be stable memory (non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be Independently of the storage device of aforementioned processor 1001.

It will be understood by those skilled in the art that structure shown in Fig. 1 does not constitute the restriction to audio frequency apparatus, can wrap It includes than illustrating more or fewer components, perhaps combines certain components or different component layouts.

As shown in Figure 1, as may include that operating system, network are logical in a kind of memory 1005 of computer storage medium Believe module, non-central sound field rebuilding program of Subscriber Interface Module SIM and multichannel.

In audio frequency apparatus shown in Fig. 1, network interface 1004 is mainly used for connecting background server, takes with the backstage Business device carries out data communication；User interface 1003 is mainly used for connecting peripheral hardware；The audio frequency apparatus is called by processor 1001 Non-central sound field rebuilding program of the multichannel stored in memory 1005, and execute multichannel provided in an embodiment of the present invention Non-central sound field rebuilding method.

Based on above-mentioned hardware configuration, the embodiment of non-central sound field rebuilding method of multichannel of the present invention is proposed.

Referring to the process signal that Fig. 2, Fig. 2 are non-central sound field rebuilding method first embodiment of multichannel of the present invention Figure.

In the first embodiment, the multichannel non-central sound field rebuilding method the following steps are included:

Step S10: when receiving sound field rebuilding instruction, the position of non-central point is determined according to sound field rebuilding instruction Information and for constructing the original sound signals for presetting original sound field, the location information of the non-central point with it is described preset it is original Center audition dot position information in sound field is different.

It is understood that in view of VBAP reconstruction sound field need to rebuild sound field centered on the listening point of center, it can Center listening point, that is, centre of sphere is denoted as O, and referred to as central point.In order to both rebuild sound field for non-central point, meanwhile, also protect Card can carry out sound field rebuilding based on the technical solution that the present embodiment describes for the sound field quality reconstructed at non-central Operation.

It should be understood that the executing subject of the present embodiment is audio frequency apparatus, it may include multiple default in the audio frequency apparatus Loudspeaker is rebuild, default reconstruction loudspeaker is also may not include and carries out wired with default reconstruction loudspeaker or be wirelessly connected, into And it forms multichannel and surround.

In the concrete realization, when receiving sound field rebuilding instruction, it can be performed and rebuild sound field at non-central listening point Reconstruction operation, for example, can first determine the location information of non-central point and construct the original sound signals for presetting original sound field.In Heart point O is the center that the original sound signals got are directed to when original sound field is preset in building, rather than central point is this Sound field rebuilding operates the center being directed to restore the sound field quality for presetting original sound field as far as possible.Non-central point is difference In the position of central point O, non-central point can be denoted as b, if being denoted as b (b with right-angle coordinate representation_x, b_y, b_z)；If being sat with pole Mark system indicates, is denoted as b=(ρ_b, θ_b, ψ_b).Wherein, ρ_bIt is to give directions the distance between b and origin O, θ_bIt is the company for giving directions b and origin O Line projects the angle between X-axis, ψ in X-axis_bIt is the angle given directions between the line and XOY plane of b and origin O.

It should be noted that reference can be made to Fig. 3, for the ease of observation, central point O can be set as coordinate system origin (0,0, 0).By this progress sound field rebuilding operation to obtain the referred to as default reconstruction loudspeaker of loudspeaker for rebuilding sound field, it is denoted as ξ_lIf with Right-angle coordinate representation is denoted as ξ_l=(ξ_lx, ξ_ly, ξ_lz), l=1,2 ... n；If indicating with polar coordinate system, it is denoted as ξ_l=(ρ_l, θ_l, ψ_l).Wherein, ρ_lIt is to give directions ξ_lThe distance between origin O, θ_lIt is to give directions ξ_lAnd the line of origin O projects between X-axis in X-axis Angle, ψ_lIt is to give directions ξ_lAngle between the line and XOY plane of origin O, l=1,2 ... n.Original sound signals will be passed through It presets the loudspeaker of original sound field to construct and is known as default original ones, be denoted as lpo_jIf being denoted as with right-angle coordinate representationJ=1,2 ... m；If indicating with polar coordinate system, it is denoted as lpo_j=(ρ_0j, θ_0j, ψ_0j).Wherein, ρ_0j It is to give directions lpo_jThe distance between origin O, θ_0jIt is to give directions lpo_jAnd the line of origin O projects the folder between X-axis in X-axis Angle, ψ_0jIt is to give directions lpo_jAngle between the line and XOY plane of origin O.

Step S20: the default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual Point, the default virtual spherical surface is using the non-central point as the centre of sphere.

It should be understood that will first be determined to finally determine default reconstruction loudspeaker reconstruction acoustical signal to be output Using non-central point b as the virtual point on the spherical surface of the centre of sphere, and it is indirectly determining final to be output according to the sound field quality at virtual point The sound field quality that constructs of reconstruction acoustical signal.

It is understood that default virtual spherical surface first can be constructed as the centre of sphere using non-central point b referring to Fig. 3, then, with By default reconstruction loudspeaker ξ centered on non-central point b_lIt is mapped on default virtual spherical surface.In other words, it establishes from non-central point b To default reconstruction loudspeaker ξ_lLocation point ray, then, using the crosspoint between the ray and default virtual spherical surface as Virtual point can be denoted as v by virtual point_l, l=1,2 ... n.The quantity of virtual point is identical as the default reconstruction quantity of loudspeaker.

In the concrete realization, non-central point b and multiple default reconstruction loudspeaker ξ can be separately connected_l, form l ray, l Ray and the default virtual spherical surface intersect at point v_l, v_lThe as position of virtual point.If using non-central point b as coordinate system Center, it is known that, virtual point v_lPolar coordinates be respectively, Its In,

It is understood that if using non-central point b as the center of coordinate system, it is known that, preset original ones lpo_j's Polar coordinates are respectively (ρ '_0j,θ′_0j,ψ′_0j), wherein

It is understood that if central point O when building to be preset to original sound field is as the center of coordinate system, it is known that, it is empty Quasi- point v_lRectangular co-ordinate be respectively (v_1x,v_1y,v_1z), (v_2x,v_2y,v_2z) ... (v_nx,v_ny,v_nz), wherein

Step S30: determine that the virtual speaker at the virtual point exists according to the sound field quality for presetting original sound field The the first virtual acoustic pressure generated at the non-central point.

It is understood that determining virtual point v_lPosition after, can will assume that the loudspeaker at the virtual point is known as The acoustical signal that the virtual speaker issues is known as virtual sound signal by virtual speaker.It need to know, virtual speaker simultaneously non-genuine is deposited Loudspeaker.

It should be understood that can will be preset after determining the virtual speaker of corresponding position according to default reconstruction loudspeaker Sound field quality of the original sound field at non-central point determines the sound field that virtual speaker generates at non-central point as benchmark Quality, the index of sound field quality is there are a variety of, for example, acoustic pressure and particle rapidity etc..

It is understood that when determining the sound field quality that virtual speaker generates at non-central point, also just directly really The practical sound pressure level that virtual speaker generates at the non-central point is determined, which can be described as the first Virtual Sound Pressure.

Step S40: the default reconstruction loudspeaking is determined by default acoustic pressure reconstruction model according to the described first virtual acoustic pressure Reconstruction acoustic pressure of the device at the non-central point, and it is corresponding with the default reconstruction loudspeaker according to reconstruction acoustic pressure determination Rebuild distribution coefficient.

It is understood that default acoustic pressure reconstruction model can be used virtual loudspeaking after the first virtual acoustic pressure has been determined The acoustic pressure that device generates at non-central point is equivalent to the default reconstruction loudspeaker ξ of practical operation_lThe sound generated at non-central point Pressure.Default reconstruction loudspeaker ξ is being determined_lThe sound of sending can be believed after the acoustic pressure parameter at non-central point according to the sound Number acoustic pressure parameter default rebuild loudspeaker ξ to derive_lThe real value of the voice signal of sending.Wherein, distribution coefficient is rebuild to use In the default reconstruction loudspeaker ξ of characterization_lThe acoustical signal of sending.

Step S50: it is determined according to the original sound signals and the reconstruction distribution coefficient in the default reconstruction loudspeaker Locate reconstruction acoustical signal to be output, by exporting the sound field for rebuilding acoustical signal reconstruction centered on the non-central point.

In the concrete realization, it can get to preset by combination original sound signals and reconstruction distribution coefficient and rebuild loudspeaker ξ_lPlace The numerical value of the reconstruction acoustical signal of reality output rebuilds loudspeaker ξ by allowing preset_lDetermining reconstruction acoustical signal is exported, it can be with structure Build out the reconstruction sound field met the requirements.It is apparent that the reconstruction sound field that constructs of technical solution of the present embodiment description will be in non- Centered on heart point b, rather than centered on central point O.

In the present embodiment first using it is default rebuild loudspeaker location point be mapped to the umbilical point on default virtual spherical surface as Virtual point, then determine the first virtual acoustic pressure that the virtual speaker at virtual point generates at non-central point, it is virtual according to first Acoustic pressure determines the default reconstruction acoustic pressure for rebuilding loudspeaker at non-central point by presetting acoustic pressure reconstruction model, and according to reconstruction sound The determining reconstruction distribution coefficient corresponding with default reconstruction loudspeaker of pressure, determines according to original sound signals and the reconstruction distribution coefficient Reconstruction acoustical signal to be output, to rebuild sound field.It is different from and rebuilds the sound field weight of sound field to preset the central point of original sound field Mode, the acoustic pressure that the present embodiment will determine that virtual speaker is generated based on the sound field quality for presetting original sound field are built, then is based on The acoustic pressure that virtual speaker generates determines the acoustic pressure of the reconstruction acoustical signal of reality output, has also determined that reconstruction sound to be output Signal had both realized for non-central point and has constructed sound field, while also improving the sound field quality for rebuilding sound field, solved in non- The second-rate technical problem of the sound field of the sound field reconstructed at heart listening point.

Referring to the process signal that Fig. 4, Fig. 4 are non-central sound field rebuilding method second embodiment of multichannel of the present invention Figure is based on above-mentioned first embodiment shown in Fig. 2, proposes that the second of non-central sound field rebuilding method of multichannel of the present invention is real Apply example.

In second embodiment, before the step S20, non-central sound field rebuilding method of the multichannel further include:

In the concrete realization, for used default virtual spherical surface, reference can be made to Fig. 3, first determines non-central point b and one The point lpo of default original ones position_jBetween distance length, which can be denoted as Length.Then, It is radius of sphericity to build a sphere by the centre of sphere and distance Length of non-central point b, it can be by the spherical surface of the sphere As default virtual spherical surface ready for use.It is apparent that the default original ones lpo_jIt falls on the default virtual spherical surface.

Further, after the step S20, non-central sound field rebuilding method of the multichannel further include:

Step S201: determine that the original sound signals produce at the non-central point by presetting original acoustic pressure calculation formula Raw original acoustic pressure.

It is understood that being determined in order to which sound field quality of the original sound field at non-central point b will be preset as benchmark The sound field quality that virtual speaker generates at non-central point b can first determine the acoustic pressure for presetting original sound field at non-central point b With particle rapidity.

In the concrete realization, in order to obtain the acoustic pressure for presetting original sound field at non-central point b, can by original sound signals with The location information input of non-central point b presets original acoustic pressure calculation formula and carries out operation, to obtain original acoustic pressure.As for default original Beginning acoustic pressure calculation formula, specifically,

Wherein, p (b, ω) indicates default original ones lpo_jWhat the original sound signals of output generated at non-central point b Original acoustic pressure, G indicate that a loudspeaker generates the ratio between acoustic pressure at away from the acoustic pressure and loudspeaker generated at its unit distance Example coefficient, k=2 π f/c are wave number, and f is the frequency of voice signal, and c is the speed of sound transmission, s_j(ω) be this preset it is original Loudspeaker lpo_jThe original sound signals of output.

Step S202: determine the original sound signals in the non-central point by default predecessor speed calculation formula Locate the predecessor speed generated.

In the concrete realization, in order to obtain the particle rapidity for presetting original sound field at non-central point b, original sound can be believed Number inputting default predecessor speed calculation formula with the location information of non-central point b carries out operation, to obtain predecessor speed Degree.As for default predecessor speed calculation formula, specifically,

Wherein, u (b, ω) indicates default original ones lpo_jWhat the original sound signals of output generated at non-central point b Predecessor speed, G indicate that a loudspeaker generates between acoustic pressure at away from the acoustic pressure and loudspeaker generated at its unit distance Proportionality coefficient, τ is atmospheric density, and k=2 π f/c is wave number, and f is the frequency of voice signal, and c is the speed of sound transmission, s_j (ω) is the default original ones lpo_jThe original sound signals of output.

Correspondingly, the step S30, comprising:

Step S301: true according to the original acoustic pressure and the predecessor speed in presetting virtual sound field reconstruction model Fixed virtual assigned coefficient corresponding with the virtual speaker at the virtual point.

It is understood that presetting each of sound field quality of the original sound field at non-central point b for assessing obtaining After index, virtual speaker corresponding with default original ones virtual sound signal to be output can be determined based on these indexs, Virtual speaker can be as close possible to the sound field space for presetting original sound field by output virtual sound signal.

In the concrete realization, original sound field will first can be preset at non-central point b based on presetting virtual sound field reconstruction model Original acoustic pressure and predecessor speed the sound field quality that virtual speaker generates at non-central point b is determined as benchmark, And then determine virtual speaker virtual sound signal to be output, above-mentioned sound field quality can be constructed by the virtual sound signal. Also, virtual assigned coefficient is used to characterize the numerical value distribution for virtual sound signal.

Step S302: the original sound signals and the virtual assigned coefficient are preset into virtual acoustic pressure by first and calculate public affairs Formula determines the first virtual acoustic pressure that the virtual speaker generates at the non-central point.

It is understood that virtual assigned system can be based on after the virtual assigned coefficient that characterization virtual sound signal has been determined Number obtains the acoustic pressure actual value that virtual sound signal generates at non-central point b.Specifically, in order to obtain virtual speaker non- Acoustic pressure at central point b can preset original sound signals, virtual assigned coefficient and the location information input second of non-central point b Virtual acoustic pressure calculation formula carries out operation, to obtain the first virtual acoustic pressure.Virtual acoustic pressure calculation formula is preset as first, specifically For,

Wherein,Indicate virtual speaker v_lThe virtual sound signal of output generated at non-central point b first Virtual acoustic pressure, G indicate that a loudspeaker generates the ratio between acoustic pressure at away from the acoustic pressure and loudspeaker generated at its unit distance Example coefficient, k=2 π f/c are wave number, and f is the frequency of voice signal, and c is the speed of sound transmission, and b indicates the position of non-central point Information, v_lIndicate the location information of virtual speaker,It indicates and virtual speaker v_lThe void that the virtual sound signal of output is consistent Quasi- distribution coefficient, s_j(ω) is the default original ones lpo_jThe original sound signals of output.

It is virtual to determine as benchmark in order to which sound field quality of the original sound field at non-central point b will be preset in the present embodiment The sound field quality that loudspeaker generates at non-central point b, can using acoustic pressure and particle rapidity as the characterization parameter of sound field quality, into And virtual speaker virtual sound signal to be output is determined with particle rapidity using acoustic pressure and is mutually echoed with virtual sound signal Virtual assigned coefficient.

Referring to the process signal that Fig. 5, Fig. 5 are non-central sound field rebuilding method 3rd embodiment of multichannel of the present invention Figure is based on above-mentioned second embodiment shown in Fig. 4, proposes that the third of non-central sound field rebuilding method of multichannel of the present invention is real Apply example.

In 3rd embodiment, described to preset virtual sound field reconstruction model include second presetting virtual acoustic pressure calculation formula and pre- If virtual particle speed calculation formula.

The step S301, comprising:

Step S3011: virtual acoustic pressure calculation formula is preset by described second and determines virtual loudspeaking at the virtual point The second virtual acoustic pressure that device generates at the non-central point.

It is understood that in order to obtain virtual assigned coefficient corresponding with virtual sound signal, can first obtain preset it is original The acoustic pressure and particle rapidity that loudspeaker generates at non-central point b, and the default original constructed based on default original ones The sound field quality of beginning sound field determines the virtual speaker in the sound field quality of the non-central point b sound field constructed.Certainly, it virtually raises Sound device can also be assessed in the sound field quality of the non-central point b sound field constructed according to acoustic pressure and particle rapidity.

In the concrete realization, in order to obtain acoustic pressure of the virtual speaker at non-central point b, virtual speaker can be waited for defeated The location information input second of virtual sound signal and non-central point b out presets virtual acoustic pressure calculation formula and carries out operation, to obtain Obtain the second virtual acoustic pressure.Virtual acoustic pressure calculation formula is preset as second, specifically,

Wherein, p'(b, ω) indicate virtual speaker v_lThe virtual sound signal of output generated at non-central point b second Virtual acoustic pressure, n are the number of loudspeakers of virtual speaker, and G indicates a loudspeaker away from the acoustic pressure generated at its unit distance With the proportionality coefficient at loudspeaker between generation acoustic pressure, k=2 π f/c is wave number, and f is the frequency of voice signal, and c is sound transmission Speed,For virtual speaker v_lThe virtual sound signal of output.

Step S3012: determine the virtual speaker described non-by the default virtual particle speed calculation formula The virtual particle speed that center generates.

It in the concrete realization, can be by virtual speaker in order to obtain particle rapidity of the virtual speaker at non-central point b The location information of virtual sound signal and non-central point b to be output inputs default virtual particle speed calculation formula and carries out operation, To obtain virtual particle speed.As for default virtual particle speed calculation formula, specifically,

Wherein, u'(b, ω) indicate virtual speaker v_lThe virtual sound signal of output generates virtual at non-central point b Particle rapidity, G indicate that a loudspeaker generates the ratio between acoustic pressure at away from the acoustic pressure and loudspeaker generated at its unit distance Example coefficient, τ are atmospheric density, and k=2 π f/c is wave number, and f is the frequency of voice signal, and c is the speed of sound transmission,For Virtual speaker v_lThe virtual sound signal of output.

Step S3013: according to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and described Virtual particle speed determines virtual assigned coefficient corresponding with the virtual speaker.

It should be understood that being determined that description presets the original acoustic pressure and predecessor of the sound field quality of original sound field After speed, can be determined based on these indexs corresponding with default original ones virtual speaker virtual sound signal to be output with And the virtual assigned coefficient that the virtual sound signal is consistent.

In addition, virtual assigned coefficient can be denoted asFor characterizing virtual speaker v_lVirtual assigned coefficient.And And virtual sound signalVirtual assigned coefficientAnd original sound signals s_jRelationship between (ω) is,So be consistent in virtual assigned coefficient with virtual sound signal when original sound signals are determined, it can be mutual Characterization.

In the concrete realization, it after being determined that the sound field quality of original sound field is preset in description, will be based on presetting original sound field Sound field quality come to determine the sound field quality of virtual sound field, virtual sound field be virtual speaker virtual sound signal to be output non- Center generates, at this point, the sound field quality of virtual sound field can be described by the second virtual acoustic pressure and virtual particle speed.Therefore And the original acoustic pressure and predecessor speed of original sound field are preset by determining, and then determine the second Virtual Sound of virtual sound field Pressure and virtual particle speed, and then determine the virtual assigned coefficient being consistent with for constructing the virtual sound signal of virtual sound field.

Further, described according to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and institute It states virtual particle speed and determines virtual assigned coefficient corresponding with the virtual speaker, comprising:

It is understood that the acquisition modes of virtual assigned coefficient can be pushed away by original acoustic pressure, it can also be by original Particle rapidity pushes away.If combining original acoustic pressure and predecessor speed simultaneously, the virtual assigned coefficient of acquisition makes Virtual Sound Field can meet the requirement for acoustic pressure and particle rapidity simultaneously.

In the concrete realization, can be based on original acoustic pressure p (b, ω) and the second virtual acoustic pressure p'(b, ω) identical benchmark comes Determine the first virtual assigned coefficient corresponding with the second virtual acoustic pressure, so,Pass throughIt can be derived from,

Exactly becauseSo the actual value of original acoustic pressure p (b, ω) can be based on to obtain void respectively Onomatopoeia signalWith the first virtual assigned coefficientThe first virtual assigned coefficient at this time is according to the virtual of acoustic pressure determination Distribution coefficient.

In the concrete realization, can be based on predecessor speed u (b, ω) and virtual particle speed u'(b, ω) identical base Standard determines the corresponding second virtual assigned coefficient with virtual particle speed u'(b, ω), so,It is logical It crossesIt can be derived from,

Exactly becauseSo the actual value of predecessor speed u (b, ω) can be based on to distinguish Obtain virtual sound signalWith the second virtual assigned coefficientThe second virtual assigned coefficient at this time is according to particle rapidity Determining virtual assigned coefficient.

It in the concrete realization, can be simultaneously according to the after the first virtual assigned coefficient and the second virtual assigned coefficient has been determined One virtual assigned coefficient and the second virtual assigned coefficient determine that meeting acoustic pressure simultaneously requires the virtual assigned required with particle rapidity Coefficient.Specifically,Under the premise of, it can simultaneousWith It can get by this two formula of simultaneous,

AW^v=B,

Wherein,

It is understood that if virtual speaker there are multiple, can get it is corresponding with virtual speaker it is multiple virtually Distribution coefficient

Further, the virtual assigned coefficient required with particle rapidity is required in order to obtain while meeting acoustic pressure, can incited somebody to action After above-mentioned two formulas simultaneous, default original ones lpo is allowed_jThe acoustic pressure and particle rapidity generated at non-central point b is as far as possible V is denoted as close to virtual speaker_lThe acoustic pressure and particle rapidity generated at non-central point b.It can be equivalent to solve following formula,

By solving the formula while obtaining multiple virtual assigned coefficients corresponding with virtual speakerAnd Virtual Sound letter Number.It can be realized by trust domain algorithm as the mode for solving the formula.

Further, the default acoustic pressure reconstruction model includes that default reconstruction acoustic pressure calculation formula and default acoustic pressure keep public Formula；

It is understood that can be determined by default reconstruction acoustic pressure calculation formula default to obtain reconstruction distribution coefficient Rebuild the acoustic pressure that loudspeaker generates at non-central point.As for default reconstruction acoustic pressure calculation formula, specifically,

Wherein,It indicates default and rebuilds loudspeaker ξ_lThe acoustical signal of output generated at non-central point b wait choose Acoustic pressure is rebuild, G indicates that a loudspeaker generates the ratio between acoustic pressure at away from the acoustic pressure and loudspeaker generated at its unit distance Example coefficient, k=2 π f/c are wave number, and f is the frequency of voice signal, and c is the speed of sound transmission, and b indicates the position of non-central point Information, ξ_lIndicate the default location information for rebuilding loudspeaker,It indicates to rebuild loudspeaker ξ with default_lThe acoustical signal of output is consistent Distribution coefficient to be chosen, s_j(ω) is the default original ones lpo_jThe original sound signals of output.

It should be noted that distribution coefficient to be chosen hereinThere are a variety of values, will be wanted based on acoustic pressure in the present embodiment It asks and is screened.Wherein, corresponding with distribution coefficient to be chosen wait choose reconstruction acoustic pressure, and reconstruction acoustic pressure actually required is known as Object reconstruction acoustic pressure, distribution coefficient actually required are known as rebuilding distribution coefficient.

It should be understood that in order to pick out satisfactory reconstruction distribution coefficient from multiple distribution coefficients to be chosen, Obtain reconstruction acoustic pressure to be chosenAfterwards, it can be determined based on the first virtual acoustic pressure benchmark identical with Object reconstruction acoustic pressure Reconstruction distribution coefficient corresponding with Object reconstruction acoustic pressure.If the first virtual acoustic pressure is denoted asAcoustic pressure is then preset to keep Formula is,

Pass throughIt can be derived from, CW^t=D,

Wherein,

If carrying out further derive to this can obtain, W^t=(C^HC+αU)^-1C^HD, wherein α is the regularization factor, and -1 indicates Inverse of a matrix, U indicate that unit matrix, H indicate conjugate transposition,For with default reconstruction loudspeaker ξ_lThe reconstruction acoustical signal phase of output The reconstruction distribution coefficient of symbol.

It should be noted that considering distribution coefficient to be chosenThere are a variety of values, calculate public affairs by default acoustic pressure of rebuilding Formula accordingly can get multiple reconstruction acoustic pressures to be chosenBut if using the first virtual acoustic pressure as reference acoustic pressure, it can To limit wait choose the numerical value for rebuilding acoustic pressure, and then the actual value for rebuilding distribution coefficient is determined, can be achieved that and be referred to acoustic pressure It is designated as the optimization that screening conditions rebuild sound field.

Further, for export the original sound signals default original ones original ones quantity be greater than etc. In 2.

It is understood that in view of the default original ones lpo in primal system_jThere may be multiple, j=1, 2 ... m, also, each of reconstructing system it is default rebuild loudspeaker all and have on default virtual spherical surface one it is corresponding virtual Loudspeaker, and each default loudspeaker of rebuilding exports respective reconstruction acoustical signal.

It should be understood that each is preset original ones lpo_jOriginal sound signals to be output are converted to one Or multiple default reconstruction loudspeaker ξ_lAfter reconstruction acoustical signal to be output, if default rebuild loudspeaker ξ_lNumber of loudspeakers be greater than Equal to 2, for example, default rebuild loudspeaker ξ_lNumber of loudspeakers be 3, then each default original ones lpo_jOriginal sound Signal will all be each mapped to three default reconstruction loudspeaker ξ_lReconstruction acoustical signal to be output.So presetting original loudspeaking When the number of loudspeakers of device is more than or equal to 2, for example, the number of loudspeakers of default original ones is 4, then 4 reconstruction sound are believed It number is overlapped, it may be determined that preset at one and rebuild loudspeaker ξ_lReconstruction acoustical signal to be output, default Superposition Formula be,

Wherein, s_flIndicate first of default reconstruction loudspeaker ξ_lThe acoustical signal to be output finally determined,For with default reconstruction Loudspeaker ξ_lThe reconstruction distribution coefficient that the reconstruction acoustical signal of output is consistent, s_j(ω) indicates j-th of default original ones lpo_jIt is defeated Original sound signals out.So can be corresponding heavy by number of signals and the original ones quantity based on default Superposition Formula Acoustical signal is built to be overlapped.

Multiple reconstruction acoustic pressures accordingly can get by default acoustic pressure calculation formula of rebuilding in the present embodiment, still, if will First virtual acoustic pressure, which is used as, can limit the numerical value for rebuilding acoustic pressure referring to acoustic pressure, and then the reality for rebuilding distribution coefficient has been determined Value can be achieved that the optimization for rebuild using acoustic pressure index as screening conditions sound field.In addition, presetting original ones and presetting It, can be by presetting Superposition Formula for number of signals and original ones number when the number of loudspeakers for rebuilding loudspeaker has multiple It measures corresponding reconstruction acoustical signal to be overlapped, preferably to complete the operation of sound field rebuilding, guarantees the sound field of sound field reconstructed Quality.

In addition, the embodiment of the present invention also proposes a kind of storage medium, be stored on the storage medium multichannel it is non-in Heart point sound field rebuilding program is realized as described above when non-central sound field rebuilding program of the multichannel is executed by processor Multichannel non-central sound field rebuilding method the step of.

In addition, the embodiment of the present invention also proposes a kind of non-central sound field rebuilding device of multichannel, described referring to Fig. 6 Non-central sound field rebuilding device of multichannel include:

Non-central determining module 10, for being instructed according to the sound field rebuilding true when receiving sound field rebuilding instruction Determine the location information of non-central point and for constructing the original sound signals for presetting original sound field, the position letter of the non-central point It ceases different from the center audition dot position information preset in original sound field.

Virtual speaker determining module 20, for the default location point for rebuilding loudspeaker to be mapped to default virtual spherical surface Umbilical point as virtual point, the default virtual spherical surface is using the non-central point as the centre of sphere.

Virtual acoustic pressure generation module 30, for being determined at the virtual point according to the sound field quality for presetting original sound field The first virtual acoustic pressure for being generated at the non-central point of virtual speaker.

Reconstructed coefficients determining module 40, for determining institute by default acoustic pressure reconstruction model according to the described first virtual acoustic pressure The default reconstruction acoustic pressure for rebuilding loudspeaker at the non-central point is stated, and according to reconstruction acoustic pressure determination and the default weight Build the corresponding reconstruction distribution coefficient of loudspeaker.

Sound field rebuilding module 50, for being determined according to the original sound signals and the reconstruction distribution coefficient described default Reconstruction acoustical signal to be output at loudspeaker is rebuild, in being by exporting the reconstruction acoustical signal reconstruction with the non-central point The sound field of the heart.

In one embodiment, non-central sound field rebuilding device of the multichannel further include:

Virtual spherical surface determining module, for calculating the distance between the non-central point and default original ones； Building is the centre of sphere and using the distance as the default virtual spherical surface of radius using the non-central point.

Original sound field determining module, for determining the original sound signals described by presetting original acoustic pressure calculation formula The original acoustic pressure generated at non-central point；Determine the original sound signals described by default predecessor speed calculation formula The predecessor speed generated at non-central point；

The virtual acoustic pressure generation module 30 is also used in presetting virtual sound field reconstruction model according to the original acoustic pressure And the predecessor speed determines virtual assigned coefficient corresponding with the virtual speaker at the virtual point；It will be described original Acoustical signal presets virtual acoustic pressure calculation formula by first with the virtual assigned coefficient and determines the virtual speaker described The the first virtual acoustic pressure generated at non-central point.

In one embodiment, the virtual acoustic pressure generation module 30 is also used to preset virtual sound pressure meter by described second It calculates formula and determines the second virtual acoustic pressure that the virtual speaker at the virtual point generates at the non-central point；By described Default virtual particle speed calculation formula determines the virtual particle speed that the virtual speaker generates at the non-central point； According to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and the virtual particle speed determine with The corresponding virtual assigned coefficient of the virtual speaker.

In one embodiment, the virtual acoustic pressure generation module 30, be also used to according to the original acoustic pressure it is determining with it is described The corresponding first virtual assigned coefficient of second virtual acoustic pressure；According to predecessor speed determination and the virtual particle speed Corresponding second virtual assigned coefficient；The determining and institute in the first virtual assigned coefficient and the second virtual assigned coefficient State the corresponding virtual assigned coefficient of virtual speaker.

In one embodiment, the reconstructed coefficients determining module 40 is also used to pass through the original sound signals described pre- If rebuilding acoustic pressure calculation formula determines the default reconstruction acoustic pressure rebuilding loudspeaker and generating at the non-central point；It will be described First virtual acoustic pressure keeps formula to determine reconstruction distribution coefficient corresponding with the reconstruction acoustic pressure by the default acoustic pressure.

In one embodiment, the sound field rebuilding module 50 is also used to be divided according to the original sound signals and described rebuild Distribution coefficient determines reconstruction acoustical signal to be output at the default reconstruction loudspeaker；By number of signals and the original ones The corresponding reconstruction acoustical signal of quantity is overlapped, to obtain acoustical signal to be output, and by exporting the acoustical signal weight to be output Build the sound field centered on the non-central point.

The other embodiments or specific implementation of non-central sound field rebuilding device of multichannel of the present invention can join According to above-mentioned each method embodiment, details are not described herein again.

It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do There is also other identical elements in the process, method of element, article or system.

The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.If listing equipment for drying Unit claim in, several in these devices, which can be, to be embodied by the same item of hardware.Word first, Second and the use of third etc. do not indicate any sequence, can be title by these word explanations.

Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art The part contributed out can be embodied in the form of software products, which is stored in a storage medium In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.

The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills Art field, is included within the scope of the present invention.

Claims

1. a kind of non-central sound field rebuilding method of multichannel, which is characterized in that non-central sound field weight of the multichannel Construction method the following steps are included:

When receiving sound field rebuilding instruction, the location information of non-central point is determined according to sound field rebuilding instruction and is used for The original sound signals of original sound field, the location information of the non-central point and the center preset in original sound field are preset in building Audition dot position information is different；

The default location point for rebuilding loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual point, the default void Intend spherical surface using the non-central point as the centre of sphere；

Determine the virtual speaker at the virtual point in the non-central point according to the sound field quality for presetting original sound field Locate the first virtual acoustic pressure generated；

According to the described first virtual acoustic pressure by default acoustic pressure reconstruction model determine the default reconstruction loudspeaker it is described it is non-in Reconstruction acoustic pressure at heart point, and according to reconstruction acoustic pressure determination and the default reconstruction loudspeaker corresponding reconstruction distribution system Number；

Weight to be output at the default reconstruction loudspeaker is determined according to the original sound signals and the reconstruction distribution coefficient Acoustical signal is built, by exporting the sound field for rebuilding acoustical signal reconstruction centered on the non-central point.

2. non-central sound field rebuilding method of multichannel as described in claim 1, which is characterized in that described by default reconstruction Before the location point of loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual point, the non-central point of the multichannel Sound field rebuilding method further include:

3. non-central sound field rebuilding method of multichannel as described in claim 1, which is characterized in that described by default reconstruction After the location point of loudspeaker is mapped to the umbilical point on default virtual spherical surface as virtual point, the non-central point of the multichannel Sound field rebuilding method further include:

The original acoustic pressure for determining that the original sound signals generate at the non-central point by presetting original acoustic pressure calculation formula；

Determine that the original sound signals generate original at the non-central point by default predecessor speed calculation formula Particle rapidity；

Correspondingly, described to determine the virtual speaker at the virtual point in institute according to the sound field quality for presetting original sound field State the first virtual acoustic pressure generated at non-central point, comprising:

It is determining and described virtual according to the original acoustic pressure and the predecessor speed in presetting virtual sound field reconstruction model The corresponding virtual assigned coefficient of virtual speaker at point；

The original sound signals and the virtual assigned coefficient are preset into virtual acoustic pressure calculation formula by first and determine the void The first virtual acoustic pressure that quasi- loudspeaker generates at the non-central point.

4. non-central sound field rebuilding method of multichannel as claimed in claim 3, which is characterized in that the default Virtual Sound Field reconstruction model presets virtual acoustic pressure calculation formula and default virtual particle speed calculation formula including second；

It is described in presetting virtual sound field reconstruction model according to the original acoustic pressure and the predecessor speed it is determining with it is described The corresponding virtual assigned coefficient of virtual speaker at virtual point, comprising:

Presetting virtual acoustic pressure calculation formula by described second determines virtual speaker at the virtual point described non-central The the second virtual acoustic pressure generated at point；

Determine what the virtual speaker generated at the non-central point by the default virtual particle speed calculation formula Virtual particle speed；

It is true according to the original acoustic pressure, the second virtual acoustic pressure, the predecessor speed and the virtual particle speed Fixed virtual assigned coefficient corresponding with the virtual speaker.

5. non-central sound field rebuilding method of multichannel as claimed in claim 4, which is characterized in that described according to the original Beginning acoustic pressure, the second virtual acoustic pressure, the predecessor speed and virtual particle speed determination are virtually raised with described The corresponding virtual assigned coefficient of sound device, comprising:

Determination is corresponding with the virtual speaker in the first virtual assigned coefficient and the second virtual assigned coefficient Virtual assigned coefficient.

6. non-central sound field rebuilding method of the multichannel as described in any one of claims 1 to 5, which is characterized in that institute Stating default acoustic pressure reconstruction model includes that default reconstruction acoustic pressure calculation formula and default acoustic pressure keep formula；

It is described to determine the default reconstruction loudspeaker described by default acoustic pressure reconstruction model according to the described first virtual acoustic pressure Reconstruction acoustic pressure at non-central point, and according to the determining reconstruction distribution corresponding with the default reconstruction loudspeaker of the reconstruction acoustic pressure Coefficient, comprising:

Determine what the default reconstruction loudspeaker generated at the non-central point by the default acoustic pressure calculation formula of rebuilding Reconstruction acoustic pressure to be chosen；

Keep formula described corresponding with the described first virtual acoustic pressure wait choose selection in reconstruction acoustic pressure by the default acoustic pressure Object reconstruction acoustic pressure, and distribute system according to the determining reconstruction corresponding with default the reconstructions loudspeaker of the Object reconstruction acoustic pressure Number.

7. non-central sound field rebuilding method of the multichannel as described in any one of claims 1 to 5, which is characterized in that use It is more than or equal to 2 in the original ones quantity for the default original ones for exporting the original sound signals；

It is described to be output at the default reconstruction loudspeaker according to the original sound signals and reconstruction distribution coefficient determination Reconstruction acoustical signal, to rebuild sound field centered on the non-central point by exporting the acoustical signal of rebuilding, comprising:

Weight to be output at the default reconstruction loudspeaker is determined according to the original sound signals and the reconstruction distribution coefficient Build acoustical signal；

Number of signals reconstruction acoustical signal corresponding with the original ones quantity is overlapped, to obtain sound letter to be output Number, and by exporting sound field of the acoustical signal reconstruction to be output centered on the non-central point.

8. a kind of audio frequency apparatus, which is characterized in that the audio frequency apparatus includes: memory, processor and is stored in the storage Non-central sound field rebuilding program of multichannel, non-central sound of the multichannel can be run on device and on the processor Field reconstruction algorithm realizes the non-central point of the multichannel as described in any one of claims 1 to 7 when being executed by the processor The step of sound field rebuilding method.

9. a kind of storage medium, which is characterized in that be stored with non-central sound field rebuilding journey of multichannel on the storage medium Sequence is realized when non-central sound field rebuilding program of the multichannel is executed by processor such as any one of claims 1 to 7 institute The step of non-central sound field rebuilding method of the multichannel stated.

10. a kind of non-central sound field rebuilding device of multichannel, which is characterized in that non-central sound field weight of the multichannel Building device includes:

Non-central determining module, for being determined in non-according to sound field rebuilding instruction when receiving sound field rebuilding instruction The location information of heart point and for constructing the original sound signals for presetting original sound field, the location information of the non-central point and institute It is different to state the center audition dot position information preset in original sound field；

Virtual speaker determining module, for the default location point for rebuilding loudspeaker to be mapped to the spherical surface on default virtual spherical surface Point is used as virtual point, and the default virtual spherical surface is using the non-central point as the centre of sphere；

Virtual acoustic pressure generation module, it is virtual at the virtual point for being determined according to the sound field quality for presetting original sound field The first virtual acoustic pressure that loudspeaker generates at the non-central point；

Reconstructed coefficients determining module, it is described default for being determined according to the described first virtual acoustic pressure by default acoustic pressure reconstruction model Reconstruction acoustic pressure of the loudspeaker at the non-central point is rebuild, and according to reconstruction acoustic pressure determination and the default reconstruction loudspeaking The corresponding reconstruction distribution coefficient of device；

Sound field rebuilding module is raised for being determined according to the original sound signals with the reconstruction distribution coefficient in the default reconstruction Reconstruction acoustical signal to be output at sound device, by exporting the sound for rebuilding acoustical signal reconstruction centered on the non-central point ?.