Patent ID: 12200435

DESCRIPTION OF EMBODIMENTS

A sound reproduction device according to an embodiment of the present disclosure includes a casing and a loudspeaker disposed inside the casing. The casing includes a first wall surface including a plurality of through holes provided in a ring-shaped area, and the loudspeaker is in an orientation in which sound is emitted toward the plurality of through holes.

Accordingly, since sound of a specific frequency band corresponding to a size of the plurality of through holes is emitted from each of the plurality of through holes, each of the through holes becomes a sound source. Therefore, the plurality of through holes provided annularly exert an effect similar to that of a loudspeaker array provided two-dimensionally in an annular shape. Thus, sound of the specific frequency band emitted from each of the plurality of through holes is intensified on a center axis as a center of the ring-shaped area, which is vertical to the first wall surface, with the result that the sound reproduction device can emit sound of the specific frequency band, which is sound having directionality in a direction of the center axis.

In addition, the plurality of through holes may include a plurality of first through holes provided along a first circle, the plurality of first through holes having hole diameters that are same and lengths that are same.

Therefore, it becomes possible to emit, from the plurality of first through holes, sound of a frequency band corresponding to the hole diameter and length of the plurality of first through holes, which is sound having directionality in a direction of a center axis of the first circle.

In addition, the plurality of through holes may include a plurality of second through holes provided along a second circle that is inside the first circle and is smaller than the first circle, the plurality of second through holes having hole diameters smaller than the hole diameters of the plurality of first through holes.

Therefore, it becomes possible to emit, from the plurality of second through holes, sound of a frequency band including a frequency band higher than the specific frequency band of the sound emitted from the plurality of first through holes, which is sound having directionality in a direction of a center axis of the second circle. As a result, sound of a wide frequency band obtained by combining the frequency band to be emitted from the plurality of first through holes and the frequency band to be emitted from the plurality of second through holes can be emitted in the direction of the center axis.

In addition, the second circle may be concentric with the first circle.

Therefore, sound to be emitted from the plurality of first through holes and sound to be emitted from the plurality of second through holes can be emitted toward the same center axis.

In addition, the casing may include a first space in which the loudspeaker is disposed and a second space through which the first space communicates with an external space outside the casing, and the second space may be a cylindrical space formed between an outer wall surface in a cylindrical shape provided along an inner circumference of the ring-shaped area and an inner wall surface in a cylindrical shape that is provided along an outer circumference of the ring-shaped area and opposes the outer wall surface.

Accordingly, sound emitted from the loudspeaker enters the second space between the outer wall surface and the inner wall surface to propagate through the second space, and thus it becomes easier for wavefronts of the sound to be aligned vertical to the outer wall surface and the inner wall surface and the sound to vertically enter the plurality of through holes. Sound of a resonance frequency determined by the hole diameter and length of the plurality of through holes and a volume of the casing resonates at a larger level in a narrower frequency band due to the wavefronts of the sound vertically entering the plurality of through holes. Thus, emission sound of the specific frequency band can be emitted to the outside of the casing at a large volume.

In addition, a center axis of the cylindrical shape formed by the outer wall surface and a center axis of the cylindrical shape formed by the inner wall surface may coincide.

Therefore, it becomes possible to make frequency characteristics of the sound emitted from the plurality of through holes uniform.

In addition, a distance between the outer wall surface and the inner wall surface may be constant in a direction of the center axis of the cylindrical shape of the outer wall surface.

Therefore, it becomes possible to make frequency characteristics of the sound emitted from the plurality of through holes uniform.

In addition, a distance between the outer wall surface and the inner wall surface may be smaller than or equal to ¼ a wavelength of sound emitted from the loudspeaker.

In addition, the loudspeaker may be disposed in an orientation in which a center axis of the loudspeaker in a sound emission direction passes through a center of the ring-shaped area.

Accordingly, since the loudspeaker is disposed such that the center axis thereof passes through the center axis of the ring-shaped area, the distance between the loudspeaker and each of the plurality of through holes can be made uniform. As a result, it becomes possible to set sound pressures and phases of the plurality of sounds emitted from the plurality of through holes to become closer to one another and further enhance the effect in which the sound of the specific frequency band emitted from each of the plurality of through holes is intensified on the center axis of the ring-shaped area.

In addition, the casing may include an opening portion in a second wall surface different from the first wall surface, the opening portion being a portion from which sound emitted from the loudspeaker is emitted to outside.

Accordingly, sound emitted from the loudspeaker is frequency-selected by the plurality of through holes so that the sound can be reproduced after being separated into sound having directionality in the direction of the center axis of the ring-shaped area, which is vertical to the first wall surface, and sound to be emitted from the opening portion. Therefore, a three-dimensional acoustic effect can be realized with a single loudspeaker.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

Embodiment 1

FIG.1Ais a perspective view showing a structure of sound reproduction device100according to Embodiment 1.FIG.1Bis a plan view of baffle2in sound reproduction device100according to Embodiment 1.

Sound reproduction device100includes cabinet1and loudspeaker3disposed inside cabinet1.

Cabinet1is a casing having a generally cuboid shape. For example, cabinet1includes 6 wall surfaces and a cuboid space inside. The 6 wall surfaces of cabinet1include baffle2as an upper surface, bottom surface1aopposing baffle2, and4side surfaces1bto1ethat are provided between baffle2and bottom surface1aand are connected to baffle2and bottom surface1a. Each of the 6 wall surfaces is a plate-like member. A volume of cabinet1is represented by V.

Of cabinet1, baffle2is a wall surface opposing the wall surface on which loudspeaker3is disposed (bottom surface1ain this embodiment). A thickness of baffle2is represented by L as will be described later and is constant. Baffle2includes a plurality of through holes4aprovided in toric ring-shaped area4. Baffle2is an example of a first wall surface. Each of the plurality of through holes4ais a circular opening having a radius a. In other words, the plurality of through holes4ahave the same hole diameter. Each of the plurality of through holes4apenetrates through baffle2vertically. Therefore, each of the plurality of through holes4ahas a length that is the same as thickness L of baffle2. In other words, the plurality of through holes4ahave the same length.

Loudspeaker3is disposed on an inner wall side of one of the wall surfaces of cabinet1and emits sound inside cabinet1. Loudspeaker3is disposed on bottom surface1asuch that a sound emission direction is directed toward baffle2. In other words, loudspeaker3is disposed on bottom surface1ain an orientation in which sound is emitted toward the plurality of through holes4a. In addition, it is favorable for loudspeaker3to be disposed at a position on an inner side of ring-shaped area4when seeing sound reproduction device100from a direction of center axis5.

It should be noted that as long as loudspeaker3is disposed such that the sound emission direction is directed toward baffle2, loudspeaker3does not need to be disposed on bottom surface1aand may be disposed at a position apart from bottom surface1a. For example, the cabinet of the sound reproduction device may include a support member that is fixed to at least one of bottom surface1a, side surfaces1bto1e, and baffle2, and loudspeaker3may be disposed on that support member such that the sound emission direction is directed toward baffle2.

In addition, of baffle2, ring-shaped area4is a toric area that has center axis5as a center and whose radius is within a predetermined range, and the plurality of through holes4aare provided in that area. Center axis5is a virtual line that passes through a center of a surface formed by baffle2and is vertical to this surface. The expression “radius is within a predetermined range” specifically refers to a range from radius R1or more to radius R2or less as shown inFIG.1B.

It should be noted that the shape of ring-shaped area4where the plurality of through holes4aare provided only needs to be annular and may be polygonal without being limited to a toric shape. The plurality of through holes4aonly need to be provided in ring-shaped area4. In addition, the plurality of through holes4aare not provided in areas other than ring-shaped area4. In other words, the plurality of through holes4aare not provided inside a circle that has center axis5as a center and has radius R1and are not provided outside a circle that has center axis5as a center and has radius R2.

Further, the plurality of through holes4amay be provided along a circle that has center axis5as a center. The plurality of through holes4amay be provided along a plurality of circles having center axis5as a center. It should be noted that the plurality of through holes4aonly need to be arranged along a circle that has center axis5as a center and may be arranged at positions deviated from the circle.

Furthermore, the plurality of through holes4amay be provided such that an opening ratio becomes constant in any area of ring-shaped area4. The opening ratio is a sum of areas of the plurality of through holes4aper unit area of ring-shaped area4. In addition, the plurality of through holes4ado not need to be arranged along the circle as long as the plurality of through holes4aare provided in ring-shaped area4with a constant opening ratio. For example, the plurality of through holes4amay be provided in arrays in two different linear directions. In other words, baffle2may have a structure in which the plurality of through holes4aarranged in arrays are provided only in ring-shaped area4.

It should be noted that the shape of cabinet1in this embodiment is generally a cuboid shape, but as long as a positional relationship between loudspeaker3and the plurality of through holes4ais as described above, the shape may be any shape, for example, a columnar shape or a polygonal columnar shape.

With this structure, sound emitted from loudspeaker3is emitted to the outside of cabinet1via the plurality of through holes4aof ring-shaped area4. The sound that has been emitted from loudspeaker3and propagated to the plurality of through holes4aresonates at resonance frequency f that is determined based on radius a and length L (corresponding to thickness of baffle2) of the respective through holes4aand volume V of cabinet1. Therefore, the sound of resonance frequency f is emitted to the outside of cabinet1at a volume larger than that of sound of frequencies other than resonance frequency f.

FIG.2is a graph showing a sound insulation effect of the baffle in which the plurality of through holes are provided. Specifically,FIG.2shows a difference between an emission sound level of a sound reproduction device in a case where baffle2is removed from cabinet1and an emission sound level of a sound reproduction device including baffle2in which a total of 400 through holes4ahaving radius a of 2.5 mm are provided at regular intervals on baffle2having thickness L of 10 mm (sound insulation level of plate in which 400 small openings each having radius a of 2.5 mm and length L of 10 mm are provided). It can be seen from the figure that the difference is small at a frequency band of 1 kHz or more and smaller than 2.5 kHz, and the sound insulation level is large at a frequency band of 200 Hz or more and smaller than 1 kHz and a frequency band of 2.5 kHz or more. This specifically means that as a result of the sound emitted from loudspeaker3being frequency-selected by the plurality of through holes4a, sound at the frequency band of 1 kHz or more and smaller than 2.5 kHz is emitted to the outside of cabinet1without being attenuated relatively as compared to sound of other frequency bands.

It should be noted that the frequency band of sound to be emitted to the outside can be set to become higher as the radius of the plurality of through holes4abecomes smaller. By adjusting the radius of the plurality of through holes4aas described above, sound of a desired frequency band can be emitted to the outside of cabinet1.

Since sound of a specific frequency band corresponding to the hole diameter and length of the plurality of through holes4ais emitted from each of the plurality of through holes4ain sound reproduction device100according to this embodiment, each of the plurality of through holes4abecomes a sound source. Therefore, the plurality of through holes4aprovided in a toric shape exert an effect similar to that of a loudspeaker array provided two-dimensionally in a toric shape. Thus, sound of the specific frequency band emitted from each of the plurality of through holes4ais intensified on center axis5, with the result that sound reproduction device100can emit sound of the specific frequency band, that has directionality in the direction of center axis5.

Embodiment 2

FIG.3is a perspective view showing a structure of a sound reproduction device according to Embodiment 2.

Sound reproduction device100A of this embodiment has the same structure as sound reproduction device100according to Embodiment 1 except for a structure of a plurality of through holes41a. Therefore, descriptions will mainly be given on the different structure, and descriptions on the same structure will be omitted.

InFIG.3, a plurality of through holes41provided in baffle2include the plurality of through holes41aarranged on a first circle and a plurality of through holes41barranged on a second circle inside the first circle. The plurality of through holes41are provided at regular intervals while being concentric with center axis5. The plurality of through holes41include the plurality of through holes41aand the plurality of through holes41bhaving different opening radiuses. On a circumference of a circle having a certain radius with center axis5being a center, through holes having the same radius are provided. For example, of ring-shaped area4having a radius of R1or more and R2or less with center axis5being a center, the plurality of through holes41ahaving radius r1are provided annularly on the first circle on an outer circumference side, and the plurality of through holes41bhaving radius r2are provided annularly on the second circle on an inner circumference side.

The second circle is smaller than the first circle. The second circle may be concentric with the first circle. In other words, the first circle and the second circle may be circles that have center axis5as the center. It should be noted that the second circle does not need to be concentric with the first circle as long as it is included in the first circle. In addition, the first circle and the second circle are provided in ring-shaped area4having the radius of R1or more and R2or less.

The lengths of the plurality of through holes41are all L which is the thickness of baffle2.

It should be noted that in this embodiment, the plurality of through holes41only need to include the plurality of through holes41aand41bhaving different radiuses (i.e., different hole diameters), and the through holes having the same radius (i.e., same hole diameter) only need to be provided on circumferences of circles having the same radius. Therefore, for example, the through holes having the same radius may be provided on circumferences of circles having different radiuses. Specifically, the plurality of through holes41aarranged on the first circle have the same hole diameter (e.g., radius r1). It should be noted that the plurality of through holes41aonly need to be arranged along the first circle and may be arranged at positions deviated from the first circle. In addition, the plurality of through holes41barranged on the second circle have the same hole diameter (e.g., radius r2), and this hole diameter is smaller than the hole diameter of the plurality of through holes41a. It should be noted that the plurality of through holes41bonly need to be arranged along the second circle and may be arranged at positions deviated from the second circle.

Since the hole diameter of the plurality of through holes41aand that of the plurality of through holes41bdiffer in sound reproduction device100A of this embodiment, a plurality of frequency bands are selected (emitted) by baffle2. Thus, sound reproduction device100A can emit sound that has a wider frequency band and has directionality in the direction of center axis5.

Embodiment 3

FIG.4is a perspective view showing a structure of a sound reproduction device according to Embodiment 3.FIG.5is a cross-sectional view of the sound reproduction device according to Embodiment 3.

Sound reproduction device100B of this embodiment has the same structure as sound reproduction device100according to Embodiment 1 except that cylindrical space S12is formed inside cabinet1B. Therefore, descriptions will mainly be given on the different structure, and descriptions on the same structure will be omitted.

Cabinet1B includes space S11and space S12. Space S11is a space where loudspeaker3is disposed. Space S11is a portion obtained by removing space S12from internal space S1formed by 6 wall surfaces (bottom surface1a, side surfaces1bto1e, and baffle2) of cabinet1B. Space S12is provided more on the baffle2side than space S11and brings space S11and an external space outside cabinet1B in communication with each other. Specifically, space S12is a cylindrical space formed between outer wall surface6aof inner wall6and inner wall surface7aof outer wall7opposing outer wall surface6a. Cabinet1B includes inner wall6and outer wall7in addition to bottom surface1a, side surfaces1bto1e, and baffle2. In other words, cabinet1B differs from cabinet1according to Embodiment 1 in the point of including inner wall6and outer wall7.

Inner wall6has a cylindrical shape. Inner wall6has one end thereof connected to baffle2and is provided in cabinet1B such that outer wall surface6aof inner wall6is positioned along an inner circumference of toric ring-shaped area4. The other end of inner wall6is not in contact with an inner surface (bottom surface1a) of cabinet1B, and a gap (space S11) is provided between the other end of inner wall6and the inner surface (bottom surface1a) of cabinet1B.

Outer wall7has a cylindrical shape that has an inner diameter larger than an outer diameter of inner wall6. Outer wall7has one end thereof connected to baffle2and is provided in cabinet1B such that inner wall surface7aof outer wall7is positioned along an outer circumference of toric ring-shaped area4. The other end of outer wall7is not in contact with the inner surface (bottom surface1a) of cabinet1B, and the gap (space S11) is provided between the other end of outer wall7and the inner surface (bottom surface1a) of cabinet1B.

Similar to Embodiment 1, out of baffle2, the plurality of through holes4aare provided in ring-shaped area4having a radius of R1or more and R2or less with center axis5being a center. Therefore, the outer diameter of inner wall6is equal to a value obtained by doubling radius R1. In addition, the inner diameter of outer wall7is equal to a value obtained by doubling radius R2. In other words, inner wall6and outer wall7form a double-layer cylinder in which inner wall6is an inner cylinder of the double-layer cylinder and outer wall7is an outer cylinder of the double-layer cylinder. Heights of inner wall6and outer wall7are the same. Thus, space S12formed between inner wall6and outer wall7extends toward an inner (bottom surface1a) side of cabinet1B from ring-shaped area4of baffle2where the plurality of through holes4aare provided. In other words, of baffle2, ring-shaped area4is provided in an area between a portion where inner wall6is connected and a portion where outer wall7is connected.

In addition, inner wall6and outer wall7are provided inside cabinet1B while being parallel to each other. In other words, a distance between outer wall surface6aof inner wall6and inner wall surface7aof outer wall7in a direction orthogonal to center axis5(radial direction) is constant in a direction parallel to center axis5(axial direction). Further, inner wall6and outer wall7have center axis5as an axis. In other words, a center axis of the cylindrical shape formed by outer wall surface6aand a center axis of the cylindrical shape formed by inner wall surface7acoincide. Therefore, frequency characteristics of sound emitted from the plurality of through holes4acan be made uniform.

In addition, the distance between outer wall surface6aand inner wall surface7amay be smaller than or equal to ¼ the wavelength of sound to be emitted from loudspeaker3.

In sound reproduction device100B of this embodiment, sound emitted from loudspeaker3enters the space between inner wall6and outer wall7and propagates between inner wall6and outer wall7as shown inFIG.6, with the result that it becomes easier for wavefronts30of the sound to be aligned vertical to respective wall surfaces6aand7aof inner wall6and outer wall7and thus vertically enter the plurality of through holes4a. Sound of resonance frequency f that is determined based on radius a and length L of the plurality of through holes4aand volume V of cabinet1B resonates at a large level in a narrower frequency band due to wavefronts30of the sound vertically entering the plurality of through holes4a, with the result that emission sound of the selected frequency band can be emitted to the outside of cabinet1B at a larger volume.

It should be noted that cylindrical space S12interposed between inner wall6and outer wall7may be sectioned into ducts in a circumferential direction of space S12by wall surfaces extending in the radial direction of inner wall6and outer wall7. Accordingly, it goes without saying that, even in the case of sound of a higher frequency band, it becomes easier for wavefronts of the sound that passes through space S12to be aligned vertical to respective wall surfaces6aand7aof inner wall6and outer wall7to thus vertically enter the plurality of through holes4a.

In addition, a sound absorber may be provided in space S12interposed between inner wall6and outer wall7. Accordingly, the frequency band of sound to be emitted from the plurality of through holes4acan be restricted.

It should be noted that inner wall6and outer wall7do not need to be cylindrical and may be of a polygonal columnar shape.

In addition, space S12provided more on the baffle2side than space S11only needs to be of a cylindrical shape, and the cylindrical shape does not need to be a shape that has a constant diameter in the direction parallel to center axis5(axial direction). The cylindrical shape of space S12may be, for example, a shape in which the diameter becomes larger as it comes closer to baffle2or a shape in which the diameter becomes smaller as it comes closer to baffle2.

It should be noted that although the spaces are provided inside inner wall6and between outer wall7and side surfaces1bto1eof cabinet1B, the structure is not limited thereto, and a structure in which the space inside inner wall6is filled with an object and the space between outer wall7and side surfaces1bto1eof cabinet1B is filled with an object may also be employed. In other words, as long as cabinet1B includes cylindrical space S12formed between outer wall surface6aand inner wall surface7a, at least one of the space inside inner wall6and the space between outer wall7and side surfaces1bto1eof cabinet1B may be filled with an object or does not need to be filled with an object. It should be noted that the object to be filled may be constituted of the same material as cabinet1B or may be constituted of a different material.

It should be noted that although cabinet1B according to this embodiment includes baffle2that is the same as that of cabinet1according to Embodiment 1, the structure is not limited thereto, and baffle2that is the same as that of cabinet1according to Embodiment 2 may be provided instead.

Embodiment 4

FIG.7is a perspective view showing a structure of a sound reproduction device according to Embodiment 4.

Sound reproduction device100C according to this embodiment differs from sound reproduction device100B according to Embodiment 3 in that loudspeaker3is disposed such that the center of loudspeaker3coincides with center axis5. More specifically, loudspeaker3is disposed in an orientation in which the center axis of loudspeaker3in the sound emission direction passes through center axis5while being directed toward baffle2.

Since loudspeaker3is disposed such that the center axis thereof passes through center axis5in sound reproduction device100C according to this embodiment, a distance between loudspeaker3and an annular inlet of space S12becomes the same at any position in a circumferential direction of the inlet. Therefore, of sound emitted from loudspeaker3, direct sound having a highest sound pressure level enters the space between inner wall6and outer wall7with substantially the same sound pressure and substantially the same phase and propagates between inner wall6and outer wall7, with the result that it becomes easier for wavefronts of the sound to be aligned vertical to respective wall surfaces6aand7aof inner wall6and outer wall7and thus be emitted to the outside of cabinet1via the plurality of through holes4a. As described above, the sound pressures and phases of the plurality of sounds emitted from the plurality of through holes4acan be made to come closer to one another, and thus the effect of intensifying sound of a specific frequency band that has been emitted from the plurality of through holes4aon center axis5can be additionally enhanced. Thus, sound reproduction device100C can emit sound having directionality in the direction of center axis5with higher accuracy.

It should be noted that similar to this embodiment, it is also possible to arrange loudspeaker3such that the center axis of loudspeaker3coincides with the center axis of baffle2in other embodiments. In this case, since the center axis of loudspeaker3passes through center axis5of ring-shaped area4, the distance between loudspeaker3and each of the plurality of through holes4acan be made the same. Accordingly, the sound pressures and phases of the plurality of sounds emitted from the plurality of through holes4acan be made to come closer to one another, and thus the effect of intensifying sound of a specific frequency band that has been emitted from each of the plurality of through holes4aon center axis5of ring-shaped area4can be additionally enhanced. Thus, the sound reproduction device in this case can emit sound of a specific frequency band, that has directionality in the direction of the center axis of the ring-shaped area with higher accuracy.

It should be noted that although cabinet1B according to this embodiment includes baffle2that is the same as that of cabinet1according to Embodiment 1, the structure is not limited thereto, and baffle2that is the same as that of cabinet1according to Embodiment 2 may be provided instead.

Embodiment 5

FIG.8is a perspective view showing a structure of a sound reproduction device according to Embodiment 5.

Sound reproduction device100D according to this embodiment differs from sound reproduction device100according to Embodiment 1 in that opening portion8is provided in cabinet1D. Opening portion8is provided on side surface1cof cabinet1D. Side surface1cis an example of a second wall surface. It should be noted that opening portion8only needs to be provided on any of bottom surface1aand side surfaces1bto1eas wall surfaces different from that on which baffle2is provided in cabinet1D, and is not limited to being provided on side surface1c.

In sound reproduction device100D according to this embodiment, sound emitted from loudspeaker3can be frequency-selected by the plurality of through holes4aprovided in a toric shape so as to be reproduced after being separated into sound having directionality in the direction of center axis5and sound to be emitted from opening portion8. Accordingly, upon reproducing natural environment sound including sound of a low frequency band like murmuring of a river and sound of a high frequency band like chirping of little birds while being set on a floor surface, for example, by emitting sound of the high frequency band upwardly so as to reflect the sound on a ceiling while reproducing sound of the low frequency band near the floor surface, sound reproduction device100D can reproduce natural environment sound as if sound of murmuring of a river is heard from near the floor surface and sound of chirping of little birds is heard from near the ceiling. Therefore, a three-dimensional acoustic effect can be realized with a single loudspeaker.

It should be noted that cabinet1according to Embodiment 2 or cabinet1B according to Embodiment 3 or 4 may include opening portion8provided in any of bottom surface1aand side surfaces1bto1eas wall surfaces different from that on which baffle2is provided, similar to this embodiment.

Particularly in a case where cabinet1B of sound reproduction devices100B and100C according to Embodiments 3 and 4 includes opening portion8, other ends of inner wall6and outer wall7on the other side of ends connected to baffle2are provided at positions apart from the inner surface of cabinet1B and loudspeaker3. In other words, a gap is provided between the other ends of inner wall6and outer wall7and the inner surface of cabinet1B and loudspeaker3. Therefore, sound emitted from loudspeaker3to space S11inside cabinet1B enters space S12between inner wall6and outer wall7and is emitted to the outside from the plurality of through holes4aand also emitted to the outside from opening portion8.

As described above, the embodiments have been described as examples of the technique of the present disclosure. The attached drawings and detailed descriptions have been provided therefor.

Therefore, in addition to the constituent elements essential for solving the problem, the constituent elements described in the attached drawings and detailed descriptions may include, for the purpose of exemplifying the technique, constituent elements that are not essential for solving the problem. Thus, just because those non-essential constituent elements are described in the attached drawings and detailed descriptions does not mean that those non-essential constituent elements should be immediately acknowledged as being essential constituent elements.

In addition, the embodiments described above are provided for exemplifying the technique of the present disclosure, so various modifications, substitutions, additions, omissions, and the like may be carried out within the scope of the appended claims or the equivalents thereof.

INDUSTRIAL APPLICABILITY

The present disclosure is applicable to a sound reproduction device capable of emitting sound having directionality using a smaller number of loudspeakers.