CN110366091A

CN110366091A - Sound field rebuilding method, equipment, storage medium and device based on acoustic pressure

Info

Publication number: CN110366091A
Application number: CN201910732177.3A
Authority: CN
Inventors: 王松; 张聪
Original assignee: Wuhan Polytechnic University
Current assignee: Wuhan Zhuoyue Audio Visual Technology Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2019-10-22
Anticipated expiration: 2039-08-07
Also published as: CN110366091B

Abstract

The present invention relates to three dimensional audio technology field, sound field rebuilding method, equipment, storage medium and device based on acoustic pressure are disclosed.By determining the location information of non-central point according to sound field rebuilding instruction and for constructing the home position point for presetting the default original ones of original sound field when receiving sound field rebuilding instruction in the present invention；Virtual spherical surface is constructed according to the location information of the location information of non-central point and home position point；The default location point for rebuilding loudspeaker is obtained, virtual sound signal is determined according to the default location point for rebuilding loudspeaker and virtual spherical surface；The virtual acoustic pressure for determining that the virtual sound signal generates at non-central point by presetting virtual acoustic pressure calculation formula；Determine that default reconstruction loudspeaker reconstruction acoustical signal to be output solves the second-rate technical problem of the sound field of the sound field reconstructed at non-central listening point to rebuild sound field of the acoustical signal reconstruction centered on non-central point by output according to virtual acoustic pressure.

Description

Sound field reconstruction method and device based on sound pressure, storage medium and device

Technical Field

The invention relates to the technical field of three-dimensional audio, in particular to a sound field reconstruction method, sound field reconstruction equipment, a sound field storage medium and a sound field reconstruction device based on sound pressure.

Background

When hearing the sound output based on the three-dimensional audio technology, people can perceive the obvious directional characteristic in the sound, thereby bringing more stereo auditory perception to people.

In order to restore the directivity of sound as much as possible, a sound field reconstruction technique is often used to reconstruct a sound field space that meets the requirements. For example, a sound field can be reconstructed Based on a Vector Based Amplitude Panning (VBAP) technique, and specifically, the sound field reconstruction method determines a center of sphere position first, and then sets physical positions of a plurality of speakers on the same spherical surface of the center of sphere, so that sounds output by the plurality of speakers are synthesized into a virtual sound source, thereby achieving the purpose of sound localization; the sound field can also be reconstructed based on the derivative technology of VBAP, specifically, the sound output by the three speakers can also be synthesized into a virtual sound source, and the sound pressure and particle velocity generated by the virtual sound source at the center of the sphere, i.e. the center listening point, are ensured to be equal to the sound pressure and particle velocity generated by the three speakers at the center listening point, so that the reconstruction of the sound field is completed, and the purpose of sound positioning is achieved.

However, obviously, when the sound field is reconstructed according to the VBAP technology and the VBAP-based derivative technology, limited by the technical limitations of the VBAP technology itself, it is limited to reconstruct the sound field with a spherical center, i.e., a center listening point. If the VBAP technology intends to reconstruct the sound field for the non-center listening point, the quality of the finally reconstructed sound field is poor.

Therefore, it is considered that there is a technical problem that the sound field quality of the sound field reconstructed at the non-center listening point is poor.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a sound-pressure-based sound field reconstruction method, sound-pressure-based sound field reconstruction equipment, a sound-pressure-based storage medium and a sound-pressure-based sound field reconstruction device, and aims to solve the technical problem that the sound field quality of a sound field reconstructed at a non-central listening point is poor.

In order to achieve the above object, the present invention provides a sound pressure-based sound field reconstruction method, including the steps of:

when a sound field reconstruction instruction is received, determining position information of a non-central point and an original position point of a preset original loudspeaker for constructing a preset original sound field according to the sound field reconstruction instruction, wherein the position information of the non-central point is different from the position information of a central listening point in the preset original sound field;

acquiring the position information of the original position point, and constructing a virtual spherical surface according to the position information of the non-central point and the position information of the original position point;

acquiring a position point of a preset reconstruction loudspeaker, and determining a virtual sound signal according to the position point of the preset reconstruction loudspeaker and the virtual spherical surface;

determining virtual sound pressure generated by the virtual sound signal at the non-central point through a preset virtual sound pressure calculation formula;

and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the virtual sound pressure so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

Preferably, the obtaining the position information of the original position point, and constructing a virtual sphere according to the position information of the non-central point and the position information of the original position point includes:

acquiring the position information of the original position point;

calculating the distance between the non-central point and the original position point according to the position information of the non-central point and the position information of the original position point;

and constructing a virtual spherical surface which takes the non-central point as a spherical center and the distance as a radius.

Preferably, the obtaining the position point of the preset reconstruction speaker, and determining the virtual sound signal according to the position point of the preset reconstruction speaker and the virtual spherical surface include:

acquiring a position point of a preset reconstruction loudspeaker;

mapping the position points of the preset reconstruction loudspeaker to spherical points on the virtual spherical surface to be used as virtual points;

determining a virtual sound signal corresponding to the virtual speaker at the virtual point based on a preset distribution coefficient formula.

Preferably, the mapping the position points of the preset reconstruction speakers to spherical points on the virtual spherical surface as virtual points includes:

and establishing a ray from the non-central point to the position point of the preset reconstruction loudspeaker, and taking the intersection point between the ray and the virtual spherical surface as a virtual point.

Preferably, the determining a virtual sound signal corresponding to a virtual speaker at the virtual point based on a preset distribution coefficient formula includes:

when the virtual point of the virtual loudspeaker and the original position point of the preset original loudspeaker are positioned on the virtual spherical surface, determining a virtual distribution coefficient corresponding to the virtual loudspeaker through a preset distribution coefficient formula according to the virtual point of the virtual loudspeaker and the original position point of the preset original loudspeaker;

and determining the virtual sound signal output by the virtual loudspeaker according to the virtual distribution coefficient and the original sound signal output by the preset original loudspeaker.

Preferably, the determining, according to the virtual sound pressure, a reconstructed sound signal to be output by the preset reconstruction speaker, so as to reconstruct a sound field centered on the non-central point by outputting the reconstructed sound signal, includes:

and determining the reconstructed sound pressure of the preset reconstructed loudspeaker at the non-central point through a preset sound pressure reconstruction model according to the virtual sound pressure, and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the reconstructed sound pressure so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

Preferably, the preset sound pressure reconstruction model comprises a preset reconstruction sound pressure calculation formula and a preset sound pressure equality principle;

the determining, according to the virtual sound pressure, a reconstructed sound pressure of the preset reconstructed speaker at the non-central point through a preset sound pressure reconstruction model, and determining a reconstructed sound signal to be output by the preset reconstructed speaker according to the reconstructed sound pressure, so as to reconstruct a sound field centered on the non-central point by outputting the reconstructed sound signal, includes:

determining to-be-selected reconstructed sound pressure generated by the preset reconstructed loudspeaker at the non-central point through the preset reconstructed sound pressure calculation formula;

selecting target reconstruction sound pressure corresponding to the virtual sound pressure from the reconstruction sound pressures to be selected according to the preset sound pressure equality principle, and determining a reconstruction distribution coefficient corresponding to the preset reconstruction loudspeaker according to the target reconstruction sound pressure;

and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the reconstructed distribution coefficient and the original sound signal output by the preset original loudspeaker, so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

Furthermore, to achieve the above object, the present invention also proposes an audio apparatus comprising a memory, a processor and a sound pressure based sound field reconstruction program stored on the memory and executable on the processor, the sound pressure based sound field reconstruction program being configured to implement the steps of the sound pressure based sound field reconstruction method as described above.

Furthermore, to achieve the above object, the present invention also proposes a storage medium having stored thereon a sound-pressure-based sound field reconstruction program that, when executed by a processor, implements the steps of the sound-pressure-based sound field reconstruction method as described above.

Further, to achieve the above object, the present invention also proposes a sound pressure-based sound field reconstruction apparatus including:

the non-central point determining module is used for determining the position information of a non-central point and an original position point of a preset original loudspeaker for constructing a preset original sound field according to a sound field reconstruction instruction when the sound field reconstruction instruction is received, wherein the position information of the non-central point is different from the position information of a central listening point in the preset original sound field;

the virtual spherical surface determining module is used for acquiring the position information of the original position point and constructing a virtual spherical surface according to the position information of the non-central point and the position information of the original position point;

the virtual sound signal determining module is used for acquiring the position point of a preset reconstruction loudspeaker and determining a virtual sound signal according to the position point of the preset reconstruction loudspeaker and the virtual spherical surface;

the virtual sound pressure determining module is used for determining virtual sound pressure generated by the virtual sound signal at the non-central point through a preset virtual sound pressure calculation formula;

and the sound field reconstruction module is used for determining a reconstructed sound signal to be output by the preset reconstruction loudspeaker according to the virtual sound pressure so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

When a sound field reconstruction instruction is received, determining position information of a non-central point and an original position point of a preset original loudspeaker for constructing a preset original sound field according to the sound field reconstruction instruction, wherein the position information of the non-central point is different from the position information of a central listening point in the preset original sound field; acquiring the position information of the original position point, and constructing a virtual spherical surface according to the position information of the non-central point and the position information of the original position point; acquiring a position point of a preset reconstruction loudspeaker, and determining a virtual sound signal according to the position point of the preset reconstruction loudspeaker and the virtual spherical surface; determining virtual sound pressure generated by the virtual sound signal at the non-central point through a preset virtual sound pressure calculation formula; and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the virtual sound pressure so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal. The method comprises the steps of mapping a preset reconstruction loudspeaker to a virtual spherical surface where a preset original loudspeaker is located, determining a virtual loudspeaker corresponding to the preset reconstruction loudspeaker, calculating to obtain virtual sound pressure, determining a reconstruction sound signal to be output according to the virtual sound pressure, and reconstructing a sound field with the center of the virtual spherical surface as the center by outputting the reconstruction sound signal, so that the technical problem that the sound field quality of the sound field reconstructed at a non-central listening point is poor is solved.

Drawings

FIG. 1 is a schematic diagram of an audio device in a hardware operating environment according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a sound-pressure-based sound field reconstruction method according to a first embodiment of the present invention;

fig. 3 is a schematic position diagram of a loudspeaker according to a first embodiment of the sound-pressure-based sound field reconstruction method of the present invention;

fig. 4 is a schematic flow chart of a sound-pressure-based sound field reconstruction method according to a second embodiment of the present invention;

fig. 5 is a schematic flow chart of a sound-pressure-based sound field reconstruction method according to a third embodiment of the present invention;

fig. 6 is a block diagram illustrating a first embodiment of an apparatus for reconstructing a sound field based on sound pressure according to the present invention.

The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an audio device in a hardware operating environment according to an embodiment of the present invention.

As shown in fig. 1, the audio device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), and the optional user interface 1003 may further include a standard wired interface and a wireless interface, and the wired interface for the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the audio device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a sound-pressure-based sound field reconstruction program.

In the audio device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting peripheral equipment; the audio apparatus calls a sound-pressure-based sound field reconstruction program stored in the memory 1005 through the processor 1001 and performs the following operations:

Further, the processor 1001 may call the sound-pressure-based sound field reconstruction program stored in the memory 1005, and also perform the following operations:

acquiring the position information of the original position point;

acquiring a position point of a preset reconstruction loudspeaker;

In this embodiment, a preset reconstruction speaker is mapped onto a virtual spherical surface where a preset original speaker is located, a virtual speaker corresponding to the preset reconstruction speaker is determined, a virtual sound pressure is calculated, a reconstruction sound signal to be output is determined according to the virtual sound pressure, and a sound field with the center of the virtual spherical surface as the center is reconstructed by outputting the reconstruction sound signal, so that the technical problem that the sound field quality of the sound field reconstructed at a non-central listening point is poor is solved.

Based on the hardware structure, the embodiment of the sound-pressure-based sound field reconstruction method is provided.

Referring to fig. 2, fig. 2 is a schematic flow chart of a sound-pressure-based sound field reconstruction method according to a first embodiment of the present invention.

In a first embodiment, the sound pressure-based sound field reconstruction method includes the steps of:

step S10: when a sound field reconstruction instruction is received, determining position information of a non-central point and an original position point of a preset original loudspeaker for constructing a preset original sound field according to the sound field reconstruction instruction, wherein the position information of the non-central point is different from the position information of a central listening point in the preset original sound field.

It should be noted that the execution subject of the present embodiment is an audio device, and may also be other devices having the same or similar functions. The audio device may include a plurality of preset reconstruction speakers, or may not include preset reconstruction speakers and be wired or wirelessly linked to the preset reconstruction speakers. The number of the preset reconstruction speakers may be 3 to form three-channel surround, or may be other numbers, which is not limited in this embodiment.

It should be understood that, in the conventional VBAP technology, a sound field needs to be reconstructed by taking a central listening point as a center, and the central listening point, i.e. a spherical center, may be denoted as O, which is referred to as a center point for short. In order to reconstruct the sound field for the non-central point and ensure the quality of the sound field reconstructed for the non-central point, the sound field reconstruction operation may be performed based on the technical solution described in this embodiment.

Referring to fig. 3, for convenience of observation, the central point O may be set as an origin (0,0,0) of a coordinate system, speakers for constructing a preset original sound field from an original sound signal may be referred to as preset original speakers, the number of speakers of the preset original speakers is 1, an original position point, which is position information of the preset original speakers, may be referred to as a point η, and if the point is represented by a rectangular coordinate system, the point η may be referred to as (η ═ η_x,η_y,η_z) (ii) a If expressed in polar coordinates, it is noted asWherein, tau₀Is the distance between the pointing eta and the origin O, theta₀Is the included angle between the projection of the connecting line of the pointing eta and the origin O on the X axis and the X axis,is an included angle between a connecting line of the point eta and the origin O and an XOY plane, and a signal of a single loudspeaker in an original sound field is preset to be S₀(frequency domain signal).

In a specific implementation, the sound field reconstruction instruction is received, and the sound field reconstruction instruction can be executed at a non-central listening pointFor example, the non-central position information and the original position point of the original loudspeaker may be determined. The central point O is a central position targeted by the preset original speaker when the preset original sound field is constructed, and the non-central point is a central position targeted by the current sound field reconstruction operation to restore the sound field quality of the preset original sound field as much as possible. The non-center point is a position different from the center point O, and can be recorded as_qExpressed in a rectangular coordinate system, q is (q)_x,q_y,q_z) (ii) a Expressed in a polar coordinate system, is recorded asWherein tau is_qIs the distance between the pointing point q and the origin O, θ_qIs the angle between the X-axis projection and the X-axis of the connecting line of the pointing q and the origin O,is the angle between the line connecting the point q and the origin O and the XOY plane.

Step S20: and acquiring the position information of the original position point, and constructing a virtual spherical surface according to the position information of the non-central point and the position information of the original position point.

It should be noted that a virtual spherical surface is constructed according to the position information of the non-central point and the position information of the original position point, specifically, a distance between the non-central point and the original position point is calculated according to the position information of the non-central point and the position information of the original position point, and a virtual spherical surface with the non-central point as a spherical center and the distance as a radius is constructed.

In a specific implementation, referring to fig. 3, a virtual spherical surface is denoted as a ball q, and the construction method thereof is as follows: the length of the distance between the connection point q and the point η where the original speaker is located is preset, and this length is denoted as Ra. Then, a sphere is constructed by taking the point q as the sphere center and the distance Ra as the sphere radius, and the sphere of the sphere can be used as a virtual sphere to be used, namely, the sphere q. Obviously, the original speaker η is preset to fall on the virtual sphere.

Step S30: and acquiring a position point of a preset reconstruction loudspeaker, and determining a virtual sound signal according to the position point of the preset reconstruction loudspeaker and the virtual spherical surface.

It should be noted that the virtual sound signal is determined according to the position point of the preset reconstruction speaker and the virtual spherical surface, specifically, the position point of the preset reconstruction speaker is mapped to a spherical point on the virtual spherical surface as a virtual point, and the virtual sound signal corresponding to the virtual speaker at the virtual point is determined based on a preset distribution coefficient formula.

It should be understood that, in order to finally determine the reconstructed acoustic signal to be output by the preset reconstructed speaker, a virtual point on the virtual sphere is determined, and the sound field quality constructed by the reconstructed acoustic signal to be output finally is indirectly determined according to the sound field quality generated by the speaker at the virtual point.

It will be appreciated that the location points of the 3 preset reconstruction loudspeakers, respectively v, are obtained₁、v₂、v₃They are expressed by a rectangular coordinate system as follows: v is₁＝(ν_1x,ν_1y,ν_1z)，ν₂＝(ν_2x,ν_2y,ν_2z)，ν₃＝(ν_3x,ν_3y,ν_3z) (ii) a Expressed in a polar coordinate system, respectively:wherein, tau_jIs pointing at v_jDistance from origin O, theta_jIs pointing at v_jThe included angle between the projection of the connecting line of the origin O and the X axis,is pointing at v_jAnd j is equal to 1,2 and 3, and the angle between a connecting line with the origin O and the XOY plane. A single preset original loudspeaker in the preset original sound field and three preset reconstruction loudspeakers in the preset reconstruction sound field are positioned on a spherical surface with an origin O (0,0,0) as the origin, and the radius of the spherical surface is tau₀In which τ is₀＝τ₁＝τ₂＝τ₃The preset original loudspeaker is positioned inside the spherical triangle formed by the three preset reconstruction loudspeakers.

It will be appreciated that, after determining the location of the virtual point, the speaker assumed to be at the virtual point may be referred to as a virtual speaker and the acoustic signal emitted by the virtual speaker may be referred to as a virtual acoustic signal. It is to be understood that virtual speakers are not actually present speakers.

It should be understood that, after the virtual speakers at the corresponding positions are determined according to the preset reconstructed speakers, because the original position point of one preset original speaker and the virtual points where the three virtual speakers are located are all located on the virtual spherical surface which takes the non-center point q as the spherical center and takes the distance Ra as the radius, that is, the reconstructed centers of the preset original speaker and the virtual speakers are to be consistent, at this time, the reconstructed centers of the two are both non-center points q. Therefore, the preset distribution coefficient formula can be applied to determine the virtual sound signals generated at the virtual loudspeakers, so that the sound field quality after the three virtual sound signals are synthesized is close to the sound field quality obtained by presetting the original sound signals output by the original loudspeakers.

Step S40: and determining the virtual sound pressure generated by the virtual sound signal at the non-central point through a preset virtual sound pressure calculation formula.

It is understood that the sound field quality generated by the reconstructed sound signal at the non-center point may be determined with reference to the sound field quality of the virtual sound signal at the non-center point, so that the sound pressure of the virtual sound signal at the non-center point q may be obtained first after the virtual sound signal output by the virtual speaker is determined. Specifically, the virtual sound signal and the position information of the non-center point q may be input into a preset virtual sound pressure calculation formula to be operated, so as to obtain the virtual sound pressure. As for the preset virtual sound pressure calculation formula, specifically,

wherein, the preset virtual sound pressure calculation formula takes the central point O as the coordinate center,representing a virtual sound pressure generated at a non-central point q by a virtual sound signal output from a virtual speaker, G representing a proportionality coefficient between a sound pressure generated at a unit distance from one speaker and a sound pressure generated at the speaker, i being an imaginary unit, k being 2 pi f/c being a wave number, f being a frequency of the sound signal, c being a speed at which the sound propagates,a virtual sound signal output for a virtual speaker.

Step S50: and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the virtual sound pressure so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

It is understood that each virtual speaker corresponds to an actually existing preset reconstruction speaker, so that the reconstructed acoustic signal output by the preset reconstruction speaker can be obtained based on the virtual acoustic signal output by the virtual speaker. The preset reconstruction loudspeaker outputs the determined reconstruction sound signal, so that a reconstruction sound field meeting the requirement can be constructed, and the sound field quality of the reconstruction sound field is ensured. Obviously, the reconstructed sound field constructed by the technical solution described in this embodiment will be centered on the non-central point q, rather than on the central point O originally adopted by the original speaker.

Referring to fig. 4, fig. 4 is a flowchart illustrating a sound pressure based sound field reconstruction method according to a second embodiment of the present invention, which is proposed based on the first embodiment illustrated in fig. 2.

In the second embodiment, the step S30 includes:

step S301: and acquiring the position point of the preset reconstruction loudspeaker.

It can be understood that the preset reconstruction speakers have respective position points, and if the number of the preset reconstruction speakers is 3, the position points of the 3 preset reconstruction speakers are respectively v₁、v₂、v₃。

Step S302: and mapping the position points of the preset reconstruction loudspeakers to spherical points on the virtual spherical surface to serve as virtual points.

It can be understood that, referring to fig. 3, if the number of speakers of the preset reconstruction speaker is 3, after constructing the virtual sphere with the non-central point q as the center of the sphere, 3 preset reconstruction speakers v are centered on the non-central point q₁、v₂、v₃Mapping onto a virtual sphere, wherein the number of virtual points is the same as the number of preset reconstructed loudspeakers, and the preset reconstructed loudspeakers v can be mapped₁The virtual point on the virtual sphere is marked as alpha₁To preset a reconstruction of the loudspeaker v₂The virtual point on the virtual sphere is marked as alpha₂To preset a reconstruction of the loudspeaker v₃The virtual point on the virtual sphere is marked as alpha₃。

When the non-center point q is set as the center of the coordinate system, the virtual point α is defined as the center of the coordinate system₁、α₂And alpha₃Can be respectively represented asAndwherein,

if the center point O is taken as the center of the coordinate system, the virtual point alpha₁、α₂And alpha₃May be respectively expressed as (alpha)_1x,α_1y,α_1z)、(α_2x,α_2y,α_2z) And (alpha)_3x,α_3y,α_3z) Wherein

if the non-central point q is taken as the center of the coordinate system, the polar coordinate of the position of the original loudspeaker is preset asWherein,

step S303: determining a virtual sound signal corresponding to the virtual speaker at the virtual point based on a preset distribution coefficient formula.

It should be noted that, the virtual sound signal corresponding to the virtual speaker at the virtual point is determined based on a preset distribution coefficient formula, specifically, when the virtual point of the virtual speaker and the original position point of the preset original speaker are located on the virtual spherical surface, the virtual distribution coefficient corresponding to the virtual speaker is determined according to the virtual point of the virtual speaker and the original position point of the preset original speaker through the preset distribution coefficient formula; and determining the virtual sound signal output by the virtual loudspeaker according to the virtual distribution coefficient and the original sound signal output by the preset original loudspeaker.

It is understood that when the number of speakers of the original speaker is preset to 1, see fig. 3, the virtual point α of the virtual speaker₁、α₂And alpha₃The original position points eta of a preset original loudspeaker are all located on a spherical surface, and the sound field construction center of the preset original loudspeaker and the sound field construction center of the virtual loudspeaker are all located on the same point.

In a specific implementation, the position information of the virtual point and the position information of the original position point can be input into a preset distribution coefficient formula to determine a virtual distribution coefficient corresponding to the virtual loudspeaker, and the virtual distribution coefficient is consistent with the virtual sound signal and can be used for representing the virtual sound signal. The preset distribution coefficient formula is as follows:

wherein,indicating the virtual distribution coefficient corresponding to the virtual speaker, the virtual point alpha at which the virtual speaker is located₁、α₂And alpha₃Can be respectively represented asAndif the non-center point q is taken as the center of the coordinate system, the polar coordinate of the position where the original loudspeaker is located is preset as

It should be understood that if the number of speakers of the reconstruction speaker is 3, the number of virtual speakers is 3, and j is 1,2, and 3. Thus, the virtual partition coefficient will be

It will be appreciated that the virtual sound signal can be obtained by multiplying the virtual partition coefficient by the original sound signal, for example, s (ω) is the original sound signal output by the preset original loudspeaker ηAnda virtual sound signal output for a virtual speaker. It can be seen that the virtual allocation coefficient coincides with the value of the virtual sound signal, which can characterize the virtual sound signal.

In this embodiment, a position point of a preset reconstruction speaker is obtained, the position point of the preset reconstruction speaker is mapped to a spherical point on the virtual spherical surface as a virtual point, and when the virtual point of the virtual speaker and an original position point of the preset original speaker are located on the virtual spherical surface, a virtual distribution coefficient corresponding to the virtual speaker is determined according to the virtual point of the virtual speaker and the original position point of the preset original speaker through a preset distribution coefficient formula, so that a virtual acoustic signal output at the virtual speaker is determined according to the virtual distribution coefficient and an original acoustic signal output by the preset original speaker.

Referring to fig. 5, fig. 5 is a flowchart illustrating a sound pressure-based sound field reconstruction method according to a third embodiment of the present invention, which is proposed based on the first embodiment shown in fig. 2.

In the third embodiment, the step S50 includes:

step S501: and determining to-be-selected reconstructed sound pressure generated by the preset reconstructed loudspeaker at the non-central point through the preset reconstructed sound pressure calculation formula.

It is understood that, after the virtual sound pressure is determined, the sound pressure generated by the virtual speaker at the non-center point may be equivalent to the sound pressure of the actually operated preset reconstructed speaker at the non-center point by using the preset sound pressure reconstruction model. After the sound pressure parameter of the sound emitted by the preset reconstruction speaker at the non-central point is determined, the real value of the sound signal actually emitted by the preset speaker can be deduced according to the sound pressure parameter of the sound signal, and the reconstruction sound signal refers to the sound signal actually emitted by the preset reconstruction speaker.

It will be appreciated that in order to finally obtain the reconstructed acoustic signal, the sound pressure generated by the preset reconstructed loudspeaker at the non-center point may be first determined by a preset reconstructed sound pressure calculation formula. As for the preset reconstruction sound pressure calculation formula, specifically,

wherein, the preset virtual sound pressure calculation formula takes the central point O as the coordinate center,denotes a to-be-selected reconstructed sound pressure generated by an acoustic signal output by a preset reconstruction speaker at a non-central point q, G denotes a proportionality coefficient between a sound pressure generated by a speaker at a unit distance from the speaker and a sound pressure generated at the speaker, i is an imaginary unit, k is 2 pi f/c is a wave number, f is a frequency of the acoustic signal, c is a speed of sound propagation, q denotes position information of the non-central point,representing the distribution coefficient to be selected in accordance with the acoustic signal output by the preset reconstruction speaker, s (ω) being the original acoustic signal output by the preset original speaker.

It should be noted that the alternative partition coefficients hereThere are various values and the screening will be based on the sound pressure requirement in this embodiment. The reconstruction sound pressure to be selected corresponds to the distribution coefficient to be selected, the actually required reconstruction sound pressure to be selected is called target reconstruction sound pressure, and the actually required distribution coefficient is called reconstruction distribution coefficient.

Step S502: and selecting target reconstruction sound pressure corresponding to the virtual sound pressure from the to-be-selected reconstruction sound pressures according to the preset sound pressure equality principle, and determining a reconstruction distribution coefficient corresponding to the preset reconstruction loudspeaker according to the target reconstruction sound pressure.

It should be understood that in order to select a desired reconstruction distribution coefficient from a plurality of distribution coefficients to be selected, a reconstruction sound pressure to be selected is obtainedThen, a reconstruction distribution coefficient corresponding to the target reconstruction sound pressure may be determined based on the same reference as the virtual sound pressure and the target reconstruction sound pressure, depending on whichAccording to the principle of preset equal sound pressure, the sound pressure can be obtained,

based on the above formula, it is then possible to obtain,

then, the above formula is solved to obtain,

W_a＝B^-1A；

where, -1 denotes the inverse of the matrix, T denotes the matrix transpose,and the sound pressure to be selected generated by the sound signal output by the preset reconstruction loudspeaker at the non-central point q is represented, i is an imaginary unit, k is 2 pi f/c is a wave number, and q represents the position information of the non-central point.

Step S503: and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the reconstructed distribution coefficient and the original sound signal output by the preset original loudspeaker, so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

As can be appreciated, according toThe signals of 3 preset reconstruction loudspeakers can be determined, S₀Signals representing individual loudspeakers in a preset original sound field, s_jJ-1, 2,3 denotes v in the reconstructed sound field_j(ν_jx,ν_jy,ν_jz) And j is the loudspeaker signal at 1,2 and 3, finally deleting 3 preset virtual loudspeakers, and reconstructing a sound field taking the non-central point as the center by using the reconstructed sound signals of the 3 preset reconstructed loudspeakers.

In this embodiment, the reconstructed sound signal actually output by the preset reconstruction speaker is determined based on the virtual sound signal of the virtual speaker, and the sound pressure can be used as an evaluation reference of sound, so that the sound field quality generated by the reconstructed sound signal at the non-central point is close to the sound field quality generated by the virtual sound signal at the non-central point, and the sound field quality of the reconstructed sound field is ensured.

Furthermore, an embodiment of the present invention also provides a storage medium having a sound pressure-based sound field reconstruction program stored thereon, which when executed by a processor, implements the following operations:

Further, the sound pressure based sound field reconstruction program when executed by the processor further performs the operations of:

acquiring the position information of the original position point;

acquiring a position point of a preset reconstruction loudspeaker;

Further, referring to fig. 6, an embodiment of the present invention further provides an acoustic pressure-based sound field reconstruction apparatus, including:

a non-central point determining module 10, configured to determine, when a sound field reconstruction instruction is received, position information of a non-central point and an original position point of a preset original speaker for constructing a preset original sound field according to the sound field reconstruction instruction, where the position information of the non-central point is different from position information of a central listening point in the preset original sound field.

It should be noted that, referring to fig. 3, for convenience of illustrationIt is observed that the center point O is set as the origin (0,0,0) of the coordinate system, the speaker for constructing the preset original sound field from the original sound signal is referred to as a preset original speaker, the number of speakers of the preset original speaker is 1, the original position point, which is the position information of the preset original speaker, is set as a point η, and if it is expressed by a rectangular coordinate system, it is set as η (η ═ η_x,η_y,η_z) (ii) a If expressed in polar coordinates, it is noted asWherein, tau₀Is the distance between the pointing eta and the origin O, theta₀Is the included angle between the projection of the connecting line of the pointing eta and the origin O on the X axis and the X axis,is an included angle between a connecting line of the point eta and the origin O and an XOY plane, and a signal of a single loudspeaker in an original sound field is preset to be S₀(frequency domain signal).

In a specific implementation, when receiving the sound field reconstruction instruction, a reconstruction operation of reconstructing the sound field at the non-center listening point may be performed, for example, the non-center position information and the original position point of the original speaker may be determined first. The central point O is a central position targeted by the preset original speaker when the preset original sound field is constructed, and the non-central point is a central position targeted by the current sound field reconstruction operation to restore the sound field quality of the preset original sound field as much as possible. The non-center point is a position different from the center point O, and may be represented by q (q ═ q) in a rectangular coordinate system_x,q_y,q_z) (ii) a Expressed in a polar coordinate system, is recorded asWherein tau is_qIs the distance between the pointing point q and the origin O, θ_qIs the angle between the X-axis projection and the X-axis of the connecting line of the pointing q and the origin O,is the angle between the line connecting the point q and the origin O and the XOY plane.

And the virtual spherical surface determining module 20 is configured to obtain the position information of the original position point, and construct a virtual spherical surface according to the position information of the non-central point and the position information of the original position point.

The virtual sound signal determining module 30 is configured to obtain a position point of a preset reconstruction speaker, and determine a virtual sound signal according to the position point of the preset reconstruction speaker and the virtual spherical surface.

And the virtual sound pressure determining module 40 is configured to determine a virtual sound pressure generated by the virtual sound signal at the non-center point through a preset virtual sound pressure calculation formula.

A sound field reconstruction module 50, configured to determine, according to the virtual sound pressure, a reconstructed sound signal to be output by the preset reconstruction speaker, so as to reconstruct a sound field centered on the non-central point by outputting the reconstructed sound signal.

In an embodiment, the virtual sphere determining module 20 is further configured to obtain position information of the original position point;

calculating the distance between the non-central point and the original position point according to the position information of the non-central point and the position information of the original position point; and constructing a virtual spherical surface which takes the non-central point as a spherical center and the distance as a radius.

In an embodiment, the virtual sound signal determining module 30 is further configured to obtain a position point of a preset reconstruction speaker; mapping the position points of the preset reconstruction loudspeaker to spherical points on the virtual spherical surface to be used as virtual points; determining a virtual sound signal corresponding to the virtual speaker at the virtual point based on a preset distribution coefficient formula.

In an embodiment, the virtual sound signal determining module 30 is further configured to establish a ray from the non-central point to the position point of the preset reconstruction speaker, and use an intersection point between the ray and the virtual spherical surface as the virtual point.

In an embodiment, the virtual acoustic signal determining module 30 is further configured to determine, when the virtual point of the virtual speaker and the original position point of the preset original speaker are located on the virtual spherical surface, a virtual distribution coefficient corresponding to the virtual speaker according to the virtual point of the virtual speaker and the original position point of the preset original speaker through a preset distribution coefficient formula; and determining the virtual sound signal output by the virtual loudspeaker according to the virtual distribution coefficient and the original sound signal output by the preset original loudspeaker.

In an embodiment, the sound field reconstructing module 50 is further configured to determine a reconstructed sound pressure of the preset reconstructing speaker at the non-central point through a preset sound pressure reconstructing model according to the virtual sound pressure, and determine a reconstructed sound signal to be output by the preset reconstructing speaker according to the reconstructed sound pressure, so as to reconstruct a sound field centered on the non-central point by outputting the reconstructed sound signal.

In an embodiment, the sound field reconstruction module 50 is further configured to determine, through the preset reconstruction sound pressure calculation formula, to-be-selected reconstruction sound pressures generated by the preset reconstruction speakers at the non-central point; selecting target reconstruction sound pressure corresponding to the virtual sound pressure from the reconstruction sound pressures to be selected according to the preset sound pressure equality principle, and determining a reconstruction distribution coefficient corresponding to the preset reconstruction loudspeaker according to the target reconstruction sound pressure; and determining a reconstructed sound signal to be output by the preset reconstructed loudspeaker according to the reconstructed distribution coefficient and the original sound signal output by the preset original loudspeaker, so as to reconstruct a sound field taking the non-central point as a center by outputting the reconstructed sound signal.

Other embodiments or specific implementation manners of the sound-pressure-based sound field reconstruction apparatus according to the present invention may refer to the above method embodiments, and are not described herein again.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A sound pressure based sound field reconstruction method, characterized by comprising the steps of:

2. The sound pressure-based sound field reconstruction method according to claim 1, wherein the obtaining of the position information of the origin point, and the constructing of the virtual sphere from the position information of the non-center point and the position information of the origin point, comprises:

acquiring the position information of the original position point;

3. The sound pressure-based sound field reconstruction method according to claim 1, wherein the obtaining of the position points of the preset reconstruction speakers and the determining of the virtual sound signal according to the position points of the preset reconstruction speakers and the virtual sphere include:

acquiring a position point of a preset reconstruction loudspeaker;

4. The sound pressure-based sound field reconstruction method according to claim 3, wherein the mapping the position points of the preset reconstruction speakers to spherical points on the virtual spherical surface as virtual points includes:

5. The sound pressure-based sound field reconstruction method according to claim 3, wherein the determining a virtual sound signal corresponding to a virtual speaker at the virtual point based on a preset distribution coefficient formula includes:

6. The sound pressure-based sound field reconstruction method according to any one of claims 1 to 5, wherein the determining a reconstructed sound signal to be output by the preset reconstruction speaker according to the virtual sound pressure to reconstruct a sound field centered on the non-center point by outputting the reconstructed sound signal includes:

7. The sound pressure-based sound field reconstruction method according to claim 6, wherein the preset sound pressure reconstruction model includes a principle that a preset reconstructed sound pressure calculation formula is equal to a preset sound pressure;

8. An audio device, characterized in that the audio device comprises: memory, a processor and a sound pressure based sound field reconstruction program stored on the memory and executable on the processor, the sound pressure based sound field reconstruction program when executed by the processor implementing the steps of the sound pressure based sound field reconstruction method according to any one of claims 1 to 7.

9. A storage medium having stored thereon a sound pressure based sound field reconstruction program which, when executed by a processor, implements the steps of the sound pressure based sound field reconstruction method according to any one of claims 1 to 7.

10. An apparatus for sound pressure based sound field reconstruction, comprising: