Speaker arrangement structure and speaker arrangement method

Abstract

To improve the sense of direction in audio for 3D content. [Solution] The speaker arrangement structure according to the present invention is a speaker arrangement structure that arranges speakers around a user, and comprises a first speaker group and a second speaker group. The first speaker group is arranged at the vertices of a regular polyhedron located on a sphere centered on the user's head. The second speaker group is arranged on the sphere at equal intervals from adjacent vertices of the regular polyhedron on which the first speaker group is arranged.

Description

Technical Field

[0001] The present invention relates to a speaker arrangement structure and a speaker arrangement method.

Background Art

[0002] Conventionally, there is a stereophonic system composed of a plurality of speakers. In Patent Document 1, in order to reproduce stereophonic sound with high realism, a technique of arranging speakers at each vertex of a cubic octahedron in an acoustic space is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the prior art, there is room for improvement in improving the realism of three-dimensional content such as 360-degree video. Specifically, in the prior art, when the entire circumference of the acoustic space is covered with speakers, the distance between the speakers is wide, and the sense of direction of the sound is impaired.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a speaker arrangement structure and a speaker arrangement method capable of improving the realism of three-dimensional content.

Means for Solving the Problems

[0006] To solve the above-mentioned problems and achieve the objective, the speaker arrangement structure according to the present invention is a speaker arrangement structure that arranges speakers around a user, and comprises a first speaker group and a second speaker group. The first speaker group is arranged at the vertices of a regular polyhedron located on a sphere centered on the user's head. The second speaker group is arranged on the sphere at equal intervals from adjacent vertices of the regular polyhedron on which the first speaker group is arranged. [Effects of the Invention]

[0007] According to the present invention, since speakers are placed at the vertices of a regular polyhedron and at equal intervals from each vertex, speakers can be placed at equal intervals and uniformly around the user, thereby improving the sense of direction of sound in 3D content. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is an overall diagram of the speaker arrangement structure. [Figure 2] Figure 2 shows the arrangement of the first speaker. [Figure 3] Figure 3 is a schematic diagram showing the distance relationship between the first speaker and the second speaker. [Figure 4] Figure 4 is a schematic diagram showing the distance relationship between the first speaker and the second speaker. [Figure 5] Figure 5 is a schematic diagram showing the distance relationship between the first and second speakers. [Figure 6] Figure 6 shows a specific example of an acoustic space created by a speaker arrangement structure. [Modes for carrying out the invention]

[0009] The following describes in detail embodiments of the speaker arrangement structure and speaker arrangement method with reference to the attached drawings. However, the present invention is not limited to the embodiments described below.

[0010] First, an overview of the speaker arrangement structure according to the embodiment will be described using Figure 1. Figure 1 is an overall view of the speaker arrangement structure. As shown in Figure 1, the speaker arrangement structure 1 according to the embodiment is a structure in which a first speaker Sp1 and a second speaker Sp2 are arranged in a dome shape.

[0011] The first speaker Sp1 is a speaker that constitutes the first speaker group, and the second speaker Sp2 is a speaker that constitutes the second speaker group. In Figure 1, the first speaker Sp1 and the second speaker Sp2 are shown in different display configurations.

[0012] Furthermore, the first speaker Sp1 and the second speaker Sp2 are, for example, speakers from the same product line. By using the same product line for the first speaker Sp1 and the second speaker Sp2 in this way, the arrangement and other aspects can be made easier compared to combining multiple products. Note that the first speaker Sp1 and the second speaker Sp2 may be speakers from different product lines.

[0013] The speaker arrangement structure 1 according to this embodiment arranges a first speaker group consisting of a first speaker Sp1 and a second speaker group consisting of a second speaker Sp2 on a spherical surface centered on a central point C.

[0014] Furthermore, as shown in Figure 1, the first speaker Sp1 and the second speaker Sp2 are positioned so that the sound output openings face the center point C. The center point C is, for example, the coordinates corresponding to the user's head. More specifically, the center point C is the coordinates of the user's head when a chair is placed inside the speaker arrangement structure 1 and the user is seated in that chair. For example, the center point C is set around the headrest of the chair installed inside the speaker arrangement structure 1.

[0015] The speaker arrangement structure 1 according to this embodiment arranges a first speaker Sp1 and a second speaker Sp2 on a spherical surface centered on a central point C, which is the user's head, and positions the speakers to cover the user's head from all sides.

[0016] Therefore, when a user views three-dimensional content such as 360-degree video, the speaker arrangement structure 1 according to the embodiment can provide an acoustic space with a correct sense of direction according to the three-dimensional content.

[0017] The first speaker Sp1 is arranged at the vertex of a regular polyhedron centered on the center point C. Hereinafter, the case where the regular polyhedron on which the first speaker Sp1 is arranged is an icosahedron composed of triangles will be described.

[0018] Since the number of vertices of the icosahedron is 12, a total of 12 first speakers Sp1 will be arranged at each vertex of the icosahedron. Note that such a regular polyhedron is not limited to an icosahedron, and may be a tetrahedron or an octahedron.

[0019] The second speaker Sp2 is arranged on the spherical surface passing through each vertex of the regular polyhedron at an equal distance from adjacent vertices of the regular polyhedron on which the first speaker Sp1 is arranged. More specifically, the second speaker Sp2 is arranged on the spherical surface passing through each vertex of the icosahedron on which the first speaker Sp1 is arranged at the shortest distance and at equal intervals from adjacent vertices of the icosahedron. That is, the second speaker Sp2 is arranged at the midpoint between adjacent vertices on the spherical surface passing through each vertex of the icosahedron.

[0020] In this way, the speaker arrangement structure 1 according to the embodiment arranges the first speaker Sp1 at the vertex of the regular polyhedron and arranges the second speaker Sp2 at the midpoint between adjacent vertices on the spherical surface passing through each vertex of the icosahedron.

[0021] Thereby, the speaker arrangement structure 1 according to the embodiment can arrange the first speaker Sp1 and the second speaker Sp2 at an equal distance and substantially at equal intervals from the center point C. Therefore, the speaker arrangement structure 1 according to the embodiment can arrange the speakers at equal intervals and evenly around the user, so that the sense of direction of the sound of the three-dimensional content can be improved. Hereinafter, the first speaker Sp1 and the second speaker Sp2 will be further described with reference to the drawings after FIG. 2.

[0022] Figure 2 shows the arrangement of the first speaker Sp1. In Figure 2, only the first speaker Sp1 is shown. As shown in Figure 2, the first speaker Sp1 is placed at each vertex of the regular icosahedron P20. A regular icosahedron is a polyhedron in which each face is an equilateral triangle. That is, the first speaker Sp1 is placed at the vertices of each equilateral triangle that make up the regular icosahedron P20.

[0023] In this way, by placing the first speaker Sp1 at the vertices of each equilateral triangle that make up the icosahedron P20, the first speaker Sp1 can be positioned in a balanced manner with respect to the center point C.

[0024] Next, we will explain the distance relationship between the first speaker Sp1 and the second speaker Sp2 using Figures 3 to 5. Figures 3 to 5 are schematic diagrams showing the distance relationship between the first speaker Sp1 and the second speaker Sp2.

[0025] As shown in Figure 3, the distance between the vertices P1 of the icosahedron where the first speaker Sp1 is placed is the first distance L1, the distance from vertex P1 of the icosahedron to the equally spaced point P2 where the second speaker Sp2 is placed is the second distance L2, and the distance between the equally spaced points P2 where the second speaker Sp2 is placed is the third distance L3. The equally spaced points P2 are points on the sphere passing through the vertices of the icosahedron that are equally spaced from adjacent vertices of the icosahedron.

[0026] Assuming the diameter of the sphere formed by speaker arrangement structure 1 is 2,900 mm, the first distance L1 is 1,525 mm, the second distance L2 is 792 mm, and the third distance L3 is 896 mm.

[0027] In other words, in the speaker arrangement structure 1 according to the embodiment, the second distance L2 from the first speaker Sp1 to the second speaker Sp2 and the third distance L3 between the second speakers Sp2 do not exactly match, resulting in an error of 896mm - 792mm = 104mm.

[0028] This is because, among regular polyhedra composed of equilateral triangles, the icosahedron has the largest number of vertices geometrically. In other words, if the speakers are evenly distributed beyond the 12 vertices of the icosahedron, it will not form a regular polyhedron, and errors will occur in the second distance L2 and the third distance L3.

[0029] In this disclosure, the apertures of the first speaker Sp1 and the second speaker Sp2 absorb errors in the second distance L2 and the third distance L3.

[0030] Specifically, the first speaker Sp1 is positioned within the opening to include a vertex P1 of the icosahedron, and the second speaker Sp2 is positioned within the opening to include an equally spaced point P2 that is equally spaced from adjacent vertices of the icosahedron.

[0031] As a result, in this disclosure, errors such as those at the second distance L2 and the third distance L3 can be absorbed at the opening of each speaker. Here, the relationship between the errors at the second distance L2 and the third distance L3 and the opening of the speaker will be explained using Figures 4 and 5.

[0032] Figure 4 describes the second distance L2, which is the distance between the first speaker Sp1 and the second speaker Sp2. As shown in Figure 4, the maximum distance Lmax1 and the minimum distance Lmin1 are defined as the distance from the opening Sp1a of the first speaker Sp1 to the adjacent opening Sp2a of the second speaker Sp2. For example, if the sphere diameter is 2900 mm and the diameters of the openings Sp1a and Sp2a are 70 mm, the maximum distance Lmax1 is 857 mm and the minimum distance Lmin1 is 723 mm.

[0033] Next, we will explain the third distance L3, which is the distance between two second speakers Sp2. As shown in Figure 5, the maximum distance Lmax2 and the minimum distance Lmin2 are defined as the distance from the opening Sp2a of one second speaker Sp2 to the opening Sp2a of the adjacent second speaker Sp2. For example, if the sphere diameter is 2900 mm and the diameter of the opening Sp2a is 70 mm, the maximum distance Lmax2 is 960 mm and the minimum distance Lmin2 is 828 mm.

[0034] In other words, the second distance L2 and the third distance L3 overlap at the speaker apertures Sp1a and Sp2a between the maximum distance Lmax1 of the second distance L2 and the minimum distance Lmin2 of the third distance L3.

[0035] In other words, in speaker arrangement structure 1, the first speaker Sp1 and the second speaker Sp2 are effectively arranged at equal intervals with respect to the center point C, so that speakers can be arranged at equal intervals and evenly all around the user.

[0036] As a result, in the speaker arrangement structure 1 according to the embodiment, the first speaker group consisting of the first speaker Sp1 and the second speaker group consisting of the second speaker Sp2 can be evenly arranged around the entire circumference with respect to the center point C.

[0037] Therefore, the speaker arrangement structure 1 according to this embodiment can improve the sense of direction of sound in 3D content. Note that increasing the spherical diameter increases the errors in the second distance L2 and the third distance L3, so it is preferable to make the opening Sp1a of the first speaker Sp1 and the opening Sp2a of the second speaker Sp2 wider.

[0038] Next, a specific example of an acoustic space formed by the speaker arrangement structure 1 according to the embodiment will be described using Figure 6. Figure 6 is a diagram showing a specific example of an acoustic space. As shown in Figure 6, the acoustic space 100 according to the embodiment further comprises a frame for fixing the first speaker group and the second speaker group arranged by the speaker arrangement structure 1.

[0039] By having the user enter the center of such an acoustic space 100 and receiving sound corresponding to the 3D content from each speaker, it is possible to provide directional 3D content.

[0040] Further effects and modifications can be readily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the specific details and representative embodiments expressed and described above. Accordingly, various modifications are possible without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents. [Explanation of Symbols]

[0041] 1. Speaker arrangement structure 100 Acoustic Spaces C center point P1 vertex P2 Equally spaced points P20 Icosahedron Sp1 First speaker Sp1a,Sp2a opening Sp2 Second speaker

Claims

1. A speaker arrangement structure in which speakers are placed around the user, A group of first speakers is arranged at the vertices of a regular polyhedron located on a sphere centered on the user's head, A second group of speakers is arranged on the surface of the sphere at equal intervals from adjacent vertices of the regular polyhedron on which the first group of speakers is arranged. A speaker arrangement structure that includes [this feature].

2. The aforementioned second speaker group is, The elements are arranged on the sphere at the shortest distance and at equal intervals from adjacent vertices of the regular polyhedron. The speaker arrangement structure according to claim 1.

3. The first speaker group is, They are arranged at the vertices of the regular polyhedron, which is composed of equilateral triangles. The speaker arrangement structure according to claim 1.

4. The first speaker group is, They are placed at the vertices of a regular icosahedron, which is composed of equilateral triangles. The speaker arrangement structure according to claim 3.

5. The first speaker group and the second speaker group are, The opening of the speaker is positioned toward the user's head. The speaker arrangement structure according to claim 1.

6. The first speaker group is, The speaker is positioned within the opening of the speaker at a location that includes a vertex of the regular polyhedron, The aforementioned second speaker group is, The speaker is positioned within the opening of the speaker at a location that includes equally spaced points, which are equally spaced from adjacent vertices of the regular polyhedron. The speaker arrangement structure according to claim 1.

7. The aforementioned second speaker group is, These are speakers of the same product as the first speaker group. The speaker arrangement structure according to claim 1.

8. A speaker placement method in which speakers are placed around the user, The first group of speakers is positioned at the vertices of a regular polyhedron located on a sphere centered on the user's head, The second speaker group is arranged on the sphere at equal intervals from adjacent vertices of the regular polyhedron where the first speaker group is located. Speaker placement method.

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