KR102058627B1 - Speaker with reduced reflection sound from ceiling - Google Patents

Abstract

The present inventor has invented a speaker of the present invention based on experiences and know-how accumulated through speaker designing and manufacturing experiences for several years. According to the present invention, a speaker can surprisingly block ceiling reflected sound, and accordingly, an effect that a speaker installed on ceiling in a room does not give a sense of fatigue to audience could be obtained. According to one embodiment of the present invention, a speaker having ceiling reflected sound reduction function includes: an enclosure which has an upper opening on an upper portion; one or more driver units which are mounted on one side of the enclosure and receive an electric signal to generate sound wave; and one or more waveguides which are installed inside the enclosure and have an exit connected to the upper opening, wherein the upper opening is installed in an interval within the length of the enclosure from ceiling, an introduction part of one or more waveguides receives sound wave generated from the one or more driver units, the received sound wave is outputted to the upper opening through the one or more waveguides, the sound wave outputted from the upper opening destructively interferes with the sound wave generated from the one or more driver units at one or more points where the sound wave generated from the one or more driver units is reflected on a structure having a speaker installed and a neighboring structure such that reflected sound by the sound wave generated from the one or more driver units is reduced.

Description

Speaker with ceiling reflection reduction function {SPEAKER WITH REDUCED REFLECTION SOUND FROM CEILING}

The present invention relates to a speaker having a function of reducing ceiling reflections.

The present invention relates to a speaker to which sound waves are output. A common problem in confined spaces such as concert halls is ceiling reflections. Ceiling reflection sound refers to the reflection sound generated by the sound waves output from the speaker reflected vertically from the ceiling.

The sound from the speaker goes directly to the audience's ears, but it hits the ceiling of the theater and is reflected and then enters the audience's ears. It can cause various acoustic defects such as echo, flutter echo, and creep.

The existing technology for suppressing this has been to install special structures such as intake and reflecting surfaces on the ceiling. However, as the size of the venue increases, the cost of designing, analyzing, and installing the ceiling and special structures greatly increases, and it is difficult to apply to a small venue that is difficult to apply such a design or a space made without considering such a design.

The present invention is to solve the conventional problems as described above, to provide a speaker having a structure that maintains the sound of the speaker and minimizes the reflection of the ceiling without installing a separate special structure on the wall or ceiling. There is this.

Speaker having a ceiling reflection sound reduction function according to an embodiment of the present invention, an enclosure having an upper opening is formed on the top, one or more driver units mounted on one side of the enclosure, receives an electrical signal to generate sound waves, the enclosure At least one waveguide installed therein and having an outlet connected to the upper opening, a waveguide introduction portion connecting the rear waveguide of the driver unit and the waveguide and receiving the sound wave generated from the driver unit, the waveguide introduction portion being received Sound waves pass through the waveguide introduction portion and the waveguide and are output to the upper opening portion, and the sound waves output from the upper opening portion interfere with the sound waves generated in the driver unit immediately after output, thereby generating the sound waves generated in the driver unit. Ceiling reflections by It can be reduced.

The speaker according to the present invention has an effect of minimizing unnecessary reflection sound generated by the ceiling while maintaining the sound of the speaker.

Figure 1 shows a speaker and each part according to an embodiment of the present invention.
2 illustrates a stacked structure of a speaker for explaining a method of manufacturing a speaker according to an embodiment of the present invention.
3A illustrates a bottom plate according to a method of manufacturing a speaker according to an embodiment of the present invention.
Figure 3b shows a top plate according to a method of manufacturing a speaker according to an embodiment of the present invention.
4A to 4E illustrate a waveguide plate according to a method of manufacturing a speaker according to an embodiment of the present invention.
Figure 4f shows an opening plate according to a method of manufacturing a speaker according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a speaker hollow part and a protrusion formed in the speaker hollow part of the speaker according to an exemplary embodiment of the present invention.
6 is a cross-sectional view showing a sound wave proceeds from the waveguide inside the enclosure to the upper opening in the speaker according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a method of reducing ceiling reflection sound by a speaker having a reflection sound reduction function according to an embodiment of the present invention.

The inventor has invented the speaker of the present invention based on the experience accumulated through years of speaker design and manufacturing experience. The speaker according to the present invention was able to surprisingly block the reflection of the ceiling, and thus it was possible to obtain the effect of not feeling fatigue to the audience when installed on the ceiling of the room.

The present invention may have various modifications and various forms, and embodiments will be described in detail in the present invention. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Terms such as "first" and "second" may be used to describe various elements, but the terms are not limited by the terms.

The terms are used to distinguish one component from another. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. A singular expression includes a plural expression unless it has a clearly different meaning in the context.

The terms "comprises" or "consists of" as used herein are intended to refer to the existence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features or numbers. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

Figure 1 shows the overall appearance of the speaker for reducing the ceiling reflection sound according to an embodiment of the present invention. In Figure 1, the speaker 100 according to an embodiment of the present invention is disposed on the premise that the location of each component. However, the present invention is not limited to only installing on the ceiling, for example, when installed on the side wall, the arrangement of each component can be adjusted to achieve the technical effect disclosed by the present invention accordingly.

The speaker 100 has a shape close to a cuboid as a whole, because the speaker enclosure mainly has a shape of a cube. However, the enclosure may have a hexahedron shape for convenience of manufacturing and may have other shapes. In another embodiment of the present invention, the shape of the speaker may be in the form of various solid shapes other than a cuboid or a combination thereof.

There are two driver units 101a and 101b in front of the speaker. The driver unit receives electric signals and generates sound waves, and wires are connected to the speaker cones in a wired manner, the speaker cones vibrate according to the electric signals transmitted from the wires, and the desired sound according to the frequency and amplitude of the vibrations. Is reconstructed and played.

Although only two driver units are shown in FIG. 1, the present invention may be composed of one, three or more driver units. Depending on the number of driver units, the spatial area covered by the sound of the speaker may vary. For example, when there are two driver units compared with one, by arranging each driver unit obliquely (not parallel), the directivity angle of a sound can be made wider or narrower.

In FIG. 1, only the frame of the speaker driver unit is illustrated, and the shape of the speaker cone is omitted. In an embodiment of the present invention, the speaker cone may have various shapes and materials.

Also, in Fig. 1, inside the speaker's enclosure, the driver unit is not arranged parallel to the front, but is arranged to face downward at an angle of about 15 degrees, which means that the sound wave is mainly downward (i.e., when the speaker is installed adjacent to the ceiling). To the audience). However, in the present invention, the speaker may be installed in the middle of the side wall and the like, and those skilled in the art will be able to properly adjust the angle of the driver unit according to the height of the speaker is installed.

In addition, in FIG. 1, the driver unit is illustrated as being located at the front lower end, but may be disposed at the bottom as well as the front lower end. Depending on the direction in which the driver unit is arranged and the angle at which the plurality of driver units are arranged, the characteristics of the sound of the speaker may be varied. It can be adjusted appropriately.

In front of the driver units 101a and 101b are speaker grills 102a and 102b which serve to protect the driver unit. In FIG. 1, although the speaker grille is also in front of the speaker, two long grooves are formed in the bottom portion of the enclosure so that sound waves generated from the driver unit are not blocked at the bottom of the enclosure.

The upper opening 103 of the speaker 100 is connected to the waveguide inside the speaker, which will be described later, and sends a portion of the sound wave inside the speaker to the waveguide introduction portion and the waveguide to come out of the upper opening. In FIG. 1, the upper opening 103 is long in the horizontal direction, and thus has a wide direction angle, and the sound waves exiting the upper opening spread widely in the horizontal direction according to the shape of the upper opening.

Speaker 100 according to an embodiment of the present invention may have a variety of configurations for fixing the speaker to the ceiling or wall, various configurations for connecting the wire for receiving an external electric signal. The rear depression 104 can be used to hold the speaker by lifting the speaker in the shape of a handle or by hooks made to the shape of the rear depression 104 to be used as a space for wire storage. Can be. The side depressions 105a and 105b formed on the left and right sides of the speaker may be used to be fixed to the wall or the like directly using a bracket or the like by using the engaging protrusion. In addition, the speaker 100 may be fixed using the bracket and the bracket insertion holes 107a and 107b.

In addition, there is a port hole 108 that connects the wires connected to the driver units 101a and 101b to the outside of the enclosure of the speaker 100. The specific shape of the wire and the port hole 108 is not shown.

Speaker 100 according to an embodiment of the present invention may have a modified configuration other than those described above, or may omit some components that are not essential among the above configuration.

The speaker 100 according to an embodiment of the present invention described with reference to FIG. 1 may be manufactured in various ways. 2 illustrates a speaker manufactured by a method of vertically stacking a plurality of flat plates in order to explain a method of manufacturing a speaker according to an embodiment of the present invention. However, the method for manufacturing the speaker of the present invention is not limited to the method described in FIG. 2, and those skilled in the art will be able to easily envision various methods for manufacturing the speaker of the present invention by other methods.

In order to manufacture the speaker of FIG. 2, waveguide forming plates 202, 203, 204, and 205 are first stacked on the bottom plate 201 in the vertical direction. Each of the waveguide forming plates 202, 203, 204, and 205 has a different shape, and when stacked, forms a waveguide introduction portion, a waveguide, and the like according to an embodiment of the present invention.

When the waveguide forming plate is stacked, a speaker hollow part may be formed in addition to the waveguide introduction part and the waveguide. The hollow part of the speaker is formed inside the speaker's enclosure, which acts as a ring for reinforcing the sound from the driver unit. However, depending on the design, the waveguide introduction part may be directly connected to the rear of the driver unit without the speaker hollow part. The inner surface of the enclosure constituting the hollow part of the speaker may be a plane without any bends, but artificially bends or protrusions may be arranged.

Thereafter, after installing the driver units 101a and 101b of the speaker and the speaker grills 102a and 102b, the intermediate plate 206 is stacked. The driver units 101a and 101b and the speaker grills 102a and 102b may be installed after assembling the top plate 208 to be described later. The intermediate plate forms the top plate of the driver units 101a and 101b, the speaker grills 102a and 102b, and the speaker hollow portion, and becomes the bottom plate of the upper opening 103.

Thereafter, the opening plate 207 is stacked on the intermediate plate 206, and the top plate 208 is installed on the opening plate 207. The upper opening 103 is formed by the opening plate 207 with the intermediate plate 206 as the bottom plate and the top plate 208 as the top plate.

This completes the speaker 100. Then, the speaker may be fixed to the ceiling or the wall using the above-described fixing means.

Each plate 201 to 208 constituting the speaker 100 may be any material, for example, may be birch or birch plywood commonly used in speaker production. Each plate may be the same material, but different plates may be used to suppress unnecessary vibration. For example, the bottom plate 201, the intermediate plate 206, and the top plate 208 may use materials different from the waveguide forming plates 202 to 205 and the opening plate 207.

Each plate can also have any length, width and thickness, in particular the thickness can be appropriately adjusted such that the waveguide introduction and the length of the waveguide through which sound waves pass perform the functions required by the present invention. For example, in an embodiment of the present invention, the bottom plate 201, the intermediate plate 206, and the top plate 208 may have a thickness of 9 mm, the waveguide forming plates 202-205, and the opening plate 207 of 24 mm.

Waveguides formed by forming holes in each plate and stacking each plate are desirable for their small weight to make the speaker heavy and to reduce unnecessary vibrations of the speaker, while large volumes of sound wave passing through the waveguide As the amount is increased, the reflection reduction performance can be improved. Those skilled in the art can consider these features to determine the size and cross-sectional area of a waveguide having an appropriate volume.

3A and 3B show the bottom plate 201 and the top plate 208 of FIG. 2, respectively, and FIGS. 4A to 4D show the waveguide forming plates 202, 203, 204, and 205 of FIG. 2, respectively. 4E illustrates the intermediate plate 206 of FIG. 2, and FIG. 4F illustrates the opening plate 207 of FIG. 2.

4A to 4F illustrate a portion of sound waves traveling through the waveguide introduction portion and the waveguide and exiting to the upper opening in the speaker according to the exemplary embodiment of the present invention. Hereinafter, an overall path (hereinafter, referred to as a waveguide) of sound waves at the waveguide introduction portion, the waveguide, and the upper opening will be described with reference to FIGS. 4A to 4F. In this embodiment, the waveguide is composed of a first waveguide, a second waveguide, and a third waveguide.

First, in FIG. 4A, sound waves generated by the driver units 101a and 101b are generated at both the front and the rear of the speaker cone, and the front sound waves pass through the speaker grilles 102a and 102b and spread to the space where the speaker is installed. The rear sound waves travel in the direction of the speaker hollow portions 401a and 401b. At this time, a part of the sound wave enters the inlets of the waveguide introduction portions 402a and 402b which are opened next to the speaker hollow portions 401a and 401b.

In FIG. 4A, the inlets of the waveguide introduction portions 402a and 402b are located at the entrances at which sound waves from the driver unit enter the speaker hollow portions 401a and 401b. In other words, the inlets of the waveguide introduction portions 402a and 402b are formed on the enclosure wall surface positioned between the speaker hollow portion and the driver unit, closer to the driver unit than the center of the speaker hollow portion.

Therefore, most of the sound waves entering the waveguide introduction portion are not the sound waves reflected from the speaker hollow portion but the sound waves immediately after coming out of the drive unit. The speaker hollow does not form part of the waveguide inlet, the waveguide inlet has a long, narrow cross-sectional area and the inlet also occupies only a very small area compared to the speaker hollow. Because of this spatial separation of the speaker hollow and waveguide inlet, it appears that the analysis of the waveguide inlet and the sound waves entering it is almost unaffected by the structure and shape of the loudspeaker hollow.

Sound waves entering the waveguide introduction portion travel along the waveguide passageway to the first waveguide inlets 403a and 403b. The first waveguide inlets 403a and 403b are not connected to the ends of the waveguide inlet, but rather slightly ahead, and further extensions 403e and 403f extend in the extension direction of the waveguide inlet. . The additional extension serves to increase the amount of sound waves entering the first waveguide inlets 403a and 403b by returning the sound waves 403c and 403d flowing back at the end of the waveguide inlet.

In one embodiment of the invention, the waveguide introduction portions 402a, 402b extend in the planar direction, while the first waveguide is a waveguide that rises vertically starting at a direction intersecting with the extension direction, for example, the first waveguide inlet, From the first waveguide inlet 403a, 403b of 4a to the first waveguide interior 404a, 404b of FIG. 4b, and back to the first waveguide interior 405a, 405b of FIG. 4c, the first waveguide outlet of FIG. 4d ( 406a, 406b).

The first waveguide that has risen vertically terminates at the first waveguide outlets 406a and 406b and the sound wave enters the second waveguide inlet 407a and 407b which is connected to the first waveguide outlet. The second waveguide is a waveguide that descends vertically, and the sound wave is from the second waveguide inlet 407a, 407b of FIG. 4D to the second waveguide interior 408a, 408b of FIG. 4C, and again inside the second waveguide 409a of FIG. 4B. 409b to the second waveguide outlets 410a and 410b of FIG. 4a.

The second waveguide differs in that the waveguide or sound wave formed vertically like the first waveguide travels from the top to the bottom rather than the top to the bottom. In addition, the second waveguide has a difference in that its cross-sectional area is larger than that of the first waveguide, as can be seen in FIG. 4D. As the cross-sectional area becomes larger, sound waves passing through the waveguide are reinforced, similar to the principle of a loudspeaker.

In FIG. 4A, sound waves exiting the second waveguide outlets 410a and 410b enter the connected third waveguide inlets 411a and 411b, passing through the third waveguide interiors 412a and 412b of FIG. 4b, and the third waveguide of FIG. 4c. To the interior 413a, 413b, back to the third waveguide interior 414a, 414b of FIG. 4D, back to the third waveguide interior 415a, 415b of FIG. 4E, and to the third waveguide outlet 416a, 416b of FIG. 4F. )

The third waveguide is a waveguide formed vertically like the first and second waveguides, and the sound waves travel from the bottom to the top. In addition, the cross-sectional area is larger than that of the second waveguide, so that the sound wave is enhanced.

Referring to FIG. 4F, the sound waves exiting the third waveguide outlets 416a and 416b go out of the speaker through the upper opening 103. Since the upper opening 103 extends outward, the sound waves also extend out of the speaker. It will spread out as it goes (417). As a result, the sound wave passing through the waveguide passes through the upper opening 103 to cancel the vertical directivity angle along the wide horizontal directivity angle.

FIG. 5 is a conceptual diagram for describing speaker hollow parts 401a and 401b of a speaker and protrusions formed therein according to an exemplary embodiment of the present invention. FIG. 5 compares the size of the speaker hollow by the waveguide forming plates 202, 203, 204, and 205 shown in FIGS. 4A to 4D. Waveguide introduction, waveguide and the like are omitted for convenience of description. The width of the speaker hollow portion in the waveguide forming plate 202 is the same as that represented by the solid line, but in the waveguide forming plate 203 (expressed by the dotted line) directly above, the area becomes narrow. The width of the waveguide forming plate 204 thereon is widened again, and the width of the waveguide forming plate 205 thereon is narrower than that of the waveguide forming plate 203 in the waveguide forming plate 205 (represented by a dashed line). As the area along the vertical direction of the speaker hollow portion changes as described above, an uneven surface or protrusion may be formed on the inner surface of the enclosure forming the speaker hollow portion. Such irregularities or protrusions formed in the hollow part of the speaker serve as a diffuser plate for inducing diffuse reflection of sound waves entering the hollow part of the speaker, and part of the sound wave entering the hollow part of the speaker flows into the waveguide introduction parts 402a and 402b through the diffused reflection. By inducing it, it seems to play a role in increasing the amount of sound waves introduced into the waveguide inlet and enhancing the ceiling reflection noise reduction performance of the present invention.

The unevenness or protrusion of the hollow part of the speaker represented by FIGS. 4A to 4D and 5 is exemplary, and those skilled in the art can design various shapes to induce desired acoustic characteristics.

6 is a cross-sectional view showing a traveling direction of the waveguide in the speaker 100 according to an embodiment of the present invention. In the first waveguide, the second waveguide, and the third waveguide described in FIGS. 4A to 4F, the sound wave 500 enters the waveguide introduction portions 402a and 402b (not shown in the cross-sectional view of FIG. 5) in FIG. 5, respectively, It corresponds to the section of falling and rising again. When the sound wave 500 passes through the waveguide and passes through the upper opening 103, the sound wave 500 has a phase delay compared to the sound waves directly emitted from the driver units 101a and 101b, and it is believed that the reflection delay can be realized by using the phase delay. .

7 is a conceptual diagram illustrating a method of reducing ceiling reflection sound by a speaker 100 having a reflection sound reduction function according to an embodiment of the present invention. In FIG. 7, the speaker is represented by a side fixed to the ceiling. Sound waves (indicated by dashed lines) that come straight to the front of the driver unit are emitted in various directions, among which sound waves 701 emitted in the ceiling direction, that is, upward direction, typically reach and reflect the ceiling, causing a ceiling reflection. In the speaker according to the present invention, the sound waves (shown in a straight line) 702 generated from the rear of the driver unit and exiting the upper opening are, for convenience, through the upper opening 103 through the upper opening 103 and the waveguide inlet and the waveguide, where the internal structure is omitted. It appears that in this process, the phase is reversed to have a phase opposite to the sound wave 701 emitted upward. Therefore, the sound wave 702 outputted from the upper opening causes destructive interference with the sound wave 701 emitted in the upward direction immediately after the output, and the sound wave 701 does not reach the ceiling. In other words, the upper opening 103 seems to invert the phase of the sound wave to control the vertical angle of the speaker.

Here, only the reflection sound reduction method of the speaker according to an embodiment of the present invention has been described, but those skilled in the art can implement various application methods using the disclosure of the present invention, all of which are included in the scope of the present invention.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

100: speaker 101a, 101b: driver unit
102a and 102b: speaker grille 103: upper opening
104: rear depression 105a, 105b: side depression
107a, 107b: Bracket insertion hole 108: Port hole
201: bottom plate 202, 203, 204, 205: waveguide forming plate
206: intermediate plate 207: opening plate
208: top plate
401a and 402b: Speaker hollow part 402a and 402b: Waveguide introduction part
403a, 403b: first waveguide inlet 404a, 404b, 405a, 405b: inside the first waveguide
406a, 406b: first waveguide outlet 407a, 407b: second waveguide inlet
408a, 408b, 409a, 409b: inside the second waveguide
410a, 410b: second waveguide outlet 411a, 411b: third waveguide inlet
412a, 412b, 413a, 413b, 414a, 414b, 415a, 415b: inside the third waveguide
416a, 416b: third waveguide exit
417: direction in which sound waves exit the waveguide
500: Direction of sound waves traveling through the waveguide inside the speaker
701: sound waves emitted upwards 702: sound waves emitted from the upper opening

Claims (12)

An enclosure having an upper opening formed thereon;
At least one driver unit mounted at one side of the enclosure and configured to receive an electrical signal to generate sound waves;
One or more waveguides installed inside the enclosure and having an outlet connected to the upper opening; And
And a waveguide introduction unit connecting the rear side of the driver unit and the waveguide and receiving the sound wave generated from the driver unit.
The sound wave received in the waveguide introduction portion is output through the waveguide introduction portion and the waveguide to the upper opening portion,
And the sound wave output from the upper opening reduces the ceiling reflection sound due to the sound wave generated in the driver unit by canceling interference with the sound wave generated in the driver unit immediately after the output. The method of claim 1,
At the point where the waveguide introduction portion and the waveguide meet, the waveguide extends in a direction crossing the direction in which the waveguide introduction portion extends,
At the point where the waveguide introduction portion and the waveguide meet, an additional extension portion extending in the extension direction of the waveguide introduction portion and connected to the waveguide introduction portion is disposed,
One or more speaker hollow projections are formed on an inner surface of the enclosure forming the speaker hollow,
And an inlet of the waveguide introduction portion is formed between the speaker hollow portion and the driver unit on an enclosure wall surface closer to the driver unit compared to the center of the speaker hollow portion. The method according to claim 1 or 2,
And a cross sectional area of the upper opening increases from the outlet of the waveguide toward the end of the upper opening. The method of claim 3, wherein
And the cross-sectional area of the waveguide introduction portion and the waveguide increases along the exit direction of the waveguide at the waveguide introduction portion. The method of claim 4, wherein
The waveguide is,
A first waveguide formed at the waveguide introduction portion toward an upper portion of the enclosure;
A second waveguide connected to an end of the first waveguide and formed toward a lower side of the enclosure;
And a third waveguide connected to an end of the second waveguide and formed toward an upper portion of the enclosure and connected to the upper opening. A speaker with a ceiling reflection sound reduction function,
A bottom plate forming a bottom surface of the speaker;
At least one waveguide forming plate stacked on an upper surface of the bottom plate and having at least one waveguide introduction portion and at least one hole formed as part of at least one waveguide;
An intermediate plate formed on an upper surface of the at least one waveguide forming plate and forming a bottom surface of an upper opening, and having at least one hole formed as part of the waveguide;
An opening plate formed on an upper surface of the intermediate plate and forming the upper opening;
An upper plate formed on an upper surface of the opening plate and forming an upper surface of the speaker;
One or more driver units fixed by the bottom plate, the at least one waveguide forming plate, and the intermediate plate, and receiving electric signals to generate sound waves;
The waveguide introduction unit connects the waveguide with the rear of the driver unit, and receives the sound wave generated from the driver unit,
The waveguide has an outlet connected to the upper opening,
The sound wave received in the waveguide introduction portion is output through the waveguide introduction portion and the waveguide to the upper opening portion,
And the sound wave output from the upper opening reduces the ceiling reflection sound due to the sound wave generated in the driver unit by canceling interference with the sound wave generated in the driver unit immediately after the output. The method of claim 6,
The at least one waveguide forming plate includes at least one hole extending in the extending direction of the waveguide introduction portion at the point where the waveguide introduction portion and the waveguide meet and a further extension portion connected to the waveguide introduction portion and a speaker hollow portion at the rear of the driver unit. One or more holes are formed,
At the point where the waveguide introduction portion and the waveguide meet, the waveguide extends in a direction crossing the direction in which the waveguide introduction portion extends,
The one or more holes to be the speaker hollow may have a different size for each waveguide forming plate of the one or more waveguide forming plates,
And an inlet of the waveguide introduction portion is formed between the speaker hollow portion and the driver unit on an enclosure wall surface closer to the driver unit relative to the center of the speaker hollow portion than the center of the speaker hollow portion. The method according to claim 6 or 7,
And a cross sectional area of the upper opening increases from the outlet of the waveguide toward the end of the upper opening. The method of claim 8,
And the cross-sectional area of the waveguide introduction portion and the waveguide increases along the exit direction of the waveguide at the waveguide introduction portion. The method of claim 9,
The waveguide is,
A first waveguide formed at the waveguide introduction portion toward an upper portion of the enclosure;
A second waveguide connected to an end of the first waveguide and formed toward a lower side of the enclosure; And
And a third waveguide connected to an end of the second waveguide and formed toward an upper portion of the enclosure and connected to the upper opening. At least one driver unit of the speaker receiving the electrical signal to generate sound waves (S1);
Receiving a portion of the sound wave generated by the driver unit at a waveguide introduction unit connecting at least one waveguide to the rear of the driver unit and transmitting it to the waveguide (S2);
Receiving a portion of the sound wave from the waveguide installed inside the speaker and having an outlet connected to the upper opening (S3);
Receiving and outputting a portion of the sound wave passing through the waveguide at the upper opening (S3); And
Reducing the ceiling reflection sound due to the sound wave generated in the driver unit by canceling the sound wave output from the upper opening with the sound wave generated in the driver unit immediately after output (S4). How to reduce ceiling reflections. The method of claim 11,
Reducing the ceiling reflection of the speaker,
Receiving a portion of the sound wave not received at the waveguide introduction portion at a speaker hollow portion at the rear of the driver unit in an enclosure (S5); And
Receiving a portion of the sound wave received by the waveguide introduction part further by the speaker hollow part protrusion, which is a plurality of protruding areas formed on an inner surface of the enclosure forming the speaker hollow part (S6); More,
Receiving and transmitting a portion of the sound wave generated in the driver unit to the waveguide at the waveguide introduction portion connecting the rear of the driver unit and one or more waveguides (S2), the waveguide at the point where the waveguide introduction portion and the waveguide meets And transmitting (S2-1) a portion of the sound wave flowing in the extension direction of the introduction portion and flowing back from the additional expansion portion connected to the waveguide introduction portion to the waveguide (S2-1). The waveguide is formed in an enclosure wall surface closer to the driver unit than the center of the hollow portion between the driver unit, and at the point where the waveguide introduction portion and the waveguide meet, the waveguide crosses the direction in which the waveguide introduction portion extends. Prolonged,
Receiving and transmitting a portion of the sound wave from the waveguide installed inside the speaker and having an outlet connected to the upper opening (S3) is connected to the end of the waveguide inlet and is formed toward the upper side of the enclosure. Receiving a portion of the sound wave at a first waveguide having a cross-sectional area and transferring the portion of the sound wave to a second waveguide (S3-1); Receiving (S3-2) receiving a portion of the sound wave from the second waveguide having a larger cross-sectional area connected to the end of the first waveguide and formed toward the bottom of the enclosure to a third waveguide; And receiving a portion of the sound wave from the third waveguide having a larger cross-sectional area connected to the end of the second waveguide and connected to the upper opening to the upper opening (S3-3). Including;).

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