Speakers, interior structure

Abstract

To provide a speaker capable of enhancing a sound function in an indoor space.SOLUTION: A speaker 20 including a face material 21 and a vibrator 25 arranged on one surface of the face material, and the face material has a core material 22 having a honeycomb structure. The core material is provided with a plurality of regions where a suitable sound range and / or a sound traveling direction changes according to reproducibility of sounds. At least one speaker, preferably a plurality of speakers are arranged on a wall portion to form an indoor space.EFFECT: Visually, a wall covering material constituting a space and the speaker are integrated with each other to achieve a clean and beautiful space design, and aurally, different sounds can be output according to sites of the space, so that it is possible to ensure diversity in the performance of a sound environment.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a speaker and a room structure including the speaker. [Background technology]

[0002] For example, Patent Document 1 discloses a diaphragm for a flat speaker that generates music or sound by vibrating a plate (panel) using a magnetic coil or a piezoelectric vibrator, and a flat speaker that uses this diaphragm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-312269 Summary of the Invention [Problem to be solved by the invention]

[0004] By using flat speakers equipped with vibrators on the boards that divide the interior space, such as the walls, floor, and ceiling, it is possible to create an interior space without the speakers being visible, which makes it possible to make effective use of the space and improve the appearance. However, conventional technology has not necessarily been sufficient for constructing an entire indoor space using flat speakers from the standpoints of convenience, comfort, functionality, preference, etc. (collectively referred to as the "function of the indoor space") in spaces where multiple people gather, such as conference rooms, stores, workplaces, etc., and in personal spaces such as bedrooms and living rooms in one's home, the inside of a vehicle, etc. (collectively referred to as the "indoor space").

[0005] For example, Patent Document 1 shows that conventional flat speakers are inferior to ordinary speakers in terms of sound quality, such as sound range, and that even flat speakers are inferior in reproducing high-pitched sounds. In other words, flat speakers also have problems such as expanding the sound range they reproduce, and cannot be said to have high functionality in indoor spaces. In Patent Document 1, in order to realize a flat speaker with improved sound quality, such as sound range, the honeycomb core of the panel (diaphragm) is made of organic fiber nonwoven fabric, and both ends of the honeycomb core are wrapped in sheets made of lightweight, highly rigid material components, such as glass woven fabric and epoxy resin. However, even this technology was not sufficient in terms of improving the functionality of indoor spaces.

[0006] Therefore, an object of the present disclosure is to provide a speaker that can enhance the sound performance in an indoor space, and also to provide an indoor structure equipped with this speaker. [Means for solving the problem]

[0007] One aspect of the present disclosure is a speaker composed of a face material and a vibrator arranged on one side of the face material, wherein the face material has a core material with a honeycomb structure, and the core material has multiple regions with different suitable sound ranges based on sound reproducibility and / or multiple regions with different sound propagation directions.

[0008] The core material may be configured so that adjacent regions are made of different materials.

[0009] The core may be configured so that adjacent regions have different cell densities in the honeycomb structure.

[0010] The core material may be configured so that the axial direction of the cells of the honeycomb structure differs between adjacent regions.

[0011] The core may be configured to have at least one of raised and recessed regions.

[0012] Another aspect of the present disclosure is an interior structure that forms an interior space surrounded by walls, a floor, and a ceiling, and an acoustic system is arranged in the interior structure, and the acoustic system is arranged with a plurality of the above-mentioned speakers. [Effects of the Invention]

[0013] According to the present disclosure, the functionality of sound in an indoor space can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing a schematic view of an interior structure 10 having an acoustic system. [Figure 2] FIG. 2 is a front view of a wall portion 11 provided in an indoor structure 10 having an acoustic system. [Figure 3] FIG. 3 is a diagram showing a schematic diagram of the acoustic system 15. As shown in FIG. [Figure 4] FIG. 4 is a perspective view illustrating the basic structure of the speaker 20. As shown in FIG. [Figure 5] FIG. 5 is a cross-sectional view of a speaker 20 illustrating a configuration in which the axial direction of the cells varies depending on the region. [Figure 6] FIG. 6 is a perspective view of a speaker 20 illustrating an embodiment in which the face material (core material) has convex regions and concave regions. [Figure 7] FIG. 7 is a diagram illustrating the operation of the indoor structure 10 having the acoustic system. DETAILED DESCRIPTION OF THE INVENTION

[0015] Each embodiment will be described below with reference to the drawings. The present invention is not limited to these embodiments. Note that the size and shape of each component shown in the drawings may be exaggerated or distorted for ease of understanding. Also, for clarity, repeated reference numerals may be omitted.

[0016] 1.Interior structure Fig. 1 is a diagram for explaining one embodiment, and is a diagram that schematically shows the appearance of an interior structure 10, and Fig. 2 is a diagram showing a front view of one wall portion 11 provided in the interior structure 10 shown in Fig. 1. Fig. 3 is a diagram that schematically shows the configuration of an acoustic system 15 included in the interior structure 10. The explanation of the interior structure 10 also includes an explanation of the speakers.

[0017] In this embodiment, the interior structure of a building will be described as an example, but the interior structure is not limited to buildings and can also be applied to the interior structure of the interior space of transportation equipment such as automobiles, trains, and airplanes.

[0018] 1 and 2, the interior structure 10 of this embodiment has walls 11 that form the sides, a ceiling 12 that forms the upper part, and a floor 13 that forms the lower part, so as to partition the interior space 1, and the interior space 1 is partitioned by the interior surrounded by these. Note that in Fig. 1, for the sake of simplicity of illustration and explanation, the walls that are present on the front side of the figure (the front side of the paper), as well as openings such as windows and doors, furniture, lighting fixtures, fixtures, etc. that are usually provided in one or more locations in the interior structure 10, are not shown. In this embodiment, the acoustic system 15 is applied to the wall 11. Therefore, the following description will be given on the assumption that the acoustic system 15 is applied to the wall 11, but the present invention is not limited to this, and an acoustic system may also be applied to the ceiling and / or floor instead of or in addition to this.

[0019] 1.1.Sound System In this embodiment, the sound system 15 has a speaker 20 and is configured to drive the speaker 20 so that the speaker 20 generates sound waves. In this embodiment, as shown in Fig. 3, in addition to the speaker 20, the sound system 15 is provided with a sensor 40, an input device 41, a sound source device 42, a calculation device 45, and an amplification device 50. Each component will be described below.

[0020] [speaker] The speaker 20 is a device that outputs sound toward the indoor space 1, and includes a surface material and a vibrator. The vibrator vibrates the surface material to output sound.

[0021] <Basic structure of a speaker> Figure 4 shows a diagram for explaining the basic structure of speaker 20. In Figure 4, a perspective view of speaker 20 is shown with a portion of rear surface material 23 broken away to reveal core material 22. However, speaker 20 can output sound across multiple ranges and / or in multiple directions with high reproducibility by using any one of forms 1 to 4 described below, or by combining two or more of these forms.

[0022] The speaker 20 includes a face material 21 and a vibrator 25. Here, the face material 21 has a core material 22, and a back surface material 23 is disposed on one side of the core material 22, and a front surface material 24 is disposed on the other side of the core material 22.

[0023] The core material 22 can be a plate material with a structure known as a honeycomb core. A typical configuration is a plate-like member in which cells, which are cylinders with a plurality of hexagonal prism-shaped cavities, are arranged in a plane perpendicular to the side faces of the hexagonal prisms, with the sides of the hexagonal prisms adjacent to each other. However, the cell shape does not have to be hexagonal prism-like, and examples of shapes that can be used include polygonal prisms such as triangular prisms and square prisms, circles, ellipses, etc.

[0024] The rear surface-side facing material 23 is a plate-shaped facing material that is placed on the side opposite the indoor space 1 when the speaker 20 is placed on the wall 11. The vibrator 25 is placed on the rear surface-side facing material 23. From this perspective, it is preferable that the rear surface-side facing material 23 has a relatively high strength and high bending rigidity. Therefore, the material that constitutes the rear surface-side facing material 23 is not particularly limited, but can be considered to be similar to the core material. However, it does not necessarily have to be the same as the core material and can be a different material.

[0025] The front surface material 24 is a plate-like surface material that is disposed so as to face the indoor space 1 when the speaker 20 is disposed on the wall 11. Therefore, the surface of the front surface material 24 is a design surface. The front surface side covering material 24 may be, for example, a board made of the same material as the back surface side covering material 23 described above, and wallpaper that forms a design surface attached to the surface of the board.

[0026] The vibrator 25 is attached to the back surface material 23 of the face material 21, and is a device that vibrates based on the received signal, transmits this to the face material 21, and outputs it as sound. Such a vibrator is sometimes called an exciter, and any known vibrator can be used. The position where the vibrator 25 is arranged on the back surface side mounting material 23 is not particularly limited and can be set appropriately. A plurality of vibrators 25 may be arranged on one surface material 21. Furthermore, the vibrator 25 can be installed on the back surface covering material 23 of the face material 21 as shown in FIG. 4, or it can be installed in a state where it is partly or entirely embedded in the face material 21.

[0027] <Specific speaker configuration> The speaker 20 is configured so that each speaker 20 has regions with different sound ranges suitable for output (sound ranges with good reproducibility) and / or regions with different sound traveling directions.

[0028] Here, the "sound range" is typically divided into low, mid, and high ranges; low range devices are sometimes called woofers and output at frequencies in the range of about 50Hz to 500Hz, midrange devices are sometimes called midrange speakers and output at frequencies in the range of about 100Hz to 5000Hz, and high range devices are sometimes called tweeters and output at frequencies in the range of about 2000Hz to 15000Hz. Furthermore, "the direction in which the sound travels" means the direction in which the sound intensity is strongest, and "the sound travels in different directions" means that the directions are different.

[0029] As a means for changing the sound range and / or sound direction appropriate for each area, the speaker surface material 21 may adopt any of the following forms 1 to 4, either singly or in combination of two or more of them.

[0030] {form 1} Form 1 is characterized by the material of the core material 22. One core material 22 is divided into a plurality of regions, and by changing the material of the core material (honeycomb core) for each region, a plurality of regions with different suitable sound ranges are provided with high reproducibility. More specifically, to adjust the sound range, materials with different specific acoustic resistances are applied to adjacent regions of the core material 22. Specific acoustic resistance, also known as acoustic impedance, indicates the pressure required to vibrate air at a unit speed. Specifically, the specific acoustic resistance value is 1a Using the density and modulus of elasticity of the material, it can be expressed as follows: Specific acoustic resistance value ≒ speed of sound (m / s) × density (kg / m 3 ) = (Modulus of Elasticity (Pa) / Density (kg / m 3 )) 0.5 ×Density (kg / m 3 ) As can be seen from this formula, the larger the specific acoustic resistance value, the more reproducible the high-frequency range can be output.

[0031] There are no particular limitations on the specific materials that can be used, but examples include aluminum, aluminum alloys such as duralumin, thermosetting resins such as epoxy resin, phenolic resin, melamine resin, phenolic epoxy resin, and urethane resin, olefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymer, various nylons, polyamide resins such as aramid resin (aromatic polyamide), thermoplastic resins such as polystyrene, polyvinyl chloride, acrylic resin, polycarbonate resin, and thermoplastic polyester resin, paper such as fine paper, Japanese paper, and aluminum hydroxide-blended paper, woven or nonwoven fabrics made of glass fiber, carbon fiber, polyester resin fiber, polyamide resin fiber, and the like, and products obtained by impregnating the above-mentioned paper, woven fabric, or nonwoven fabric with the above-mentioned thermosetting resin and curing it.

[0032] For example, aluminum has excellent reproducibility in the high frequency range, while woven or nonwoven fabric has excellent reproducibility in the low frequency range.

[0033] In the first embodiment, from the above viewpoint, it is sufficient that there are a plurality of regions made of different materials, and it is sufficient that two or more regions are provided. Furthermore, the shape of each region is not particularly limited, and any necessary shape can be adopted. There are no particular limitations on the method for manufacturing core materials that change materials for each region in this way, but examples include creating core materials for each region and arranging them, or using a 3D printer to change the material for each region.

[0034] {form 2} Form 2 is characterized by the density of the cells of the honeycomb core of the core material 22. A single core 22 is divided into multiple regions, and by changing the cell density in each region, multiple regions suitable for different sound ranges are created. Here, "cell density" is defined as the number of cells arranged per unit area. The cell density can be increased for areas where high-frequency sound reproduction is desired, and decreased for areas where low-frequency sound reproduction is desired.

[0035] In the second embodiment, from the above viewpoint, it is sufficient that there are a plurality of regions with different cell densities, and it is sufficient that two or more regions are provided. Furthermore, the shape of each region is not particularly limited, and any necessary shape can be adopted. There are no particular limitations on the method for manufacturing core material that changes the cell density in each region in this way, but examples include creating and arranging core material in each region, or using a 3D printer to change the cell density in each region.

[0036] {form 3} Form 3 has a characteristic in the axial direction of the cells of the honeycomb core of the core material 22. Figure 5 shows a speaker 20, which is an example of form 3. Figure 5 is a cross-sectional view of speaker 20. In this example, core material 20 has a first region 22a, a second region 22b, and a third region 22c, which have different sound propagation directions.

[0037] In this example, in the first region 22a, the axis of the hexagonal columnar space of each cell of the honeycomb core is normal to the face material 21, and the direction of sound propagation in this region is also normal to this normal direction, as shown by the straight arrow Va in Figure 5. In this embodiment, in the second region 22b, the honeycomb core has an axis direction of the hexagonal columnar space of each cell that is α (α≠0°) relative to the normal direction of the face material 21, and the direction of sound propagation in this region is also the same as α, as shown by the straight arrow Vb in Figure 5. In this embodiment, in the third region 22c, the honeycomb core has an axis direction of the hexagonal columnar space of each cell that is β (β ≠ 0°, β ≠ α) relative to the normal direction of the face material 21, and the direction of sound propagation in that region of the speaker 20 is also the same as β, as shown by the straight arrow Vc in Figure 5. In other words, the honeycomb structure is like a collection of cylinders, and when the cylinders are vibrated, the vibrations are transmitted in the direction of the cylinders. Therefore, the direction of the sound is also thought to be in the direction of the cylinders (the axial direction of the cylinders), which can be considered the direction of sound propagation. The same applies below.

[0038] According to the third aspect, a single speaker can output sound so that the sound travels in different directions, and the sound can be output three-dimensionally in the indoor space, thereby enhancing the functionality of the sound.

[0039] In the third embodiment, from the above viewpoint, it is sufficient that there are a plurality of regions in which the axial directions of the cells are different, and it is sufficient that two or more regions are provided. Furthermore, the shape of each region is not particularly limited, and any necessary shape can be adopted. There are no particular limitations on the method for manufacturing core material that changes the cell axis direction for each region in this way, but examples include creating and arranging core material for each region, or using a 3D printer to change the cell axis direction for each region.

[0040] {form 4} Form 4 is characterized by the shape of the core material 22. Fig. 6 shows a speaker 20 as an example of form 4. Fig. 6 is a perspective view of the speaker 20. In this example, the face material 21 has a recessed region 22d and a raised region 22e. Similarly, the core material 22 also has a recessed region 22d and a raised region 22e.

[0041] In this example, the face material 21 (core material 22) has irregularities, and in the recessed region 22d, the sound travels in a direction that is concentrated as shown by the straight arrow VIa in FIG. On the other hand, in the convex region 22e, the sound travels in a direction that spreads as shown by the straight arrow VIb in FIG.

[0042] According to the fourth aspect, a single speaker can output sound so that the sound travels in different directions, and the sound can be output three-dimensionally in the indoor space, thereby enhancing the functionality of the sound.

[0043] In view of the above, in the fourth embodiment, it is sufficient to have at least one convex region and one convex region, and two or more convex regions and two or more concave regions may be provided. The shape of each region is not particularly limited, and any necessary shape can be adopted. For example, a spherical surface may be applied to the convex region and the concave region.

[0044] {Combination of Form 1 to Form 4} The face material 21 has at least one of the above-mentioned features 1 to 4. This provides the above-mentioned effects, thereby improving the sound performance in the indoor space. Furthermore, the surface material 21 may be applied in combination with any two or more of the first to fourth forms. In this case, the areas of the forms may or may not coincide with each other. This allows for a composite and effective improvement in sound quality.

[0045] [Sensor] The sensor 40 is a device that detects a desired state. The type of sensor is not particularly limited as long as it is a sensor of a type appropriate for the needs. Examples of such sensors include a motion sensor that detects the presence or absence of a person, an optical sensor, a sensor that detects a person's facial expression by analyzing image information using a predetermined algorithm, an acoustic sensor that detects sounds of various frequencies such as infrasound, sounds in the audible frequency range, and ultrasound, a sensor that detects a person's voice by analyzing sound information detected by the acoustic sensor using a predetermined algorithm, a temperature sensor, a humidity sensor, a body movement sensor such as a gyro sensor that detects the motion state of a person, animal, or inanimate object, such as the position, speed, angular velocity, acceleration, or angular acceleration, a vital sign sensor that detects various predetermined physical quantities such as body temperature, blood pressure, respiratory rate, cardiac potential, and brain waves and analyzes them using a predetermined algorithm as necessary to measure or visualize a person's physical or mental state or sleep state, a magnetic sensor, an infrared sensor, and the like.

[0046] [Input Device] The input device 41 is a device for inputting commands to the arithmetic unit 45. There are no particular limitations on the input device 41 as long as it can input commands to the arithmetic unit 45, but examples include a keyboard and a mouse.

[0047] [Sound source device] The sound source device 42 is a device that inputs a signal corresponding to sound to the arithmetic device 45. There is no particular limitation on this device, but examples include devices such as microphones that directly convert sound into electrical or other audio signals in real time, as well as various types of audio recording and playback devices that convert sound from recording discs, optical disks, magnetic tapes, various semiconductor storage devices, etc. into various physical quantities such as groove shape, magnetism, electricity, and optical properties such as optical reflectance, and record the converted sound, and then play it back as an appropriate audio signal. Note that while Fig. 3 shows only one sound source device 42, multiple sound source devices 42 may be provided, and each sound source device 42 may record and play back a different audio signal.

[0048] [Arithmetic device] The arithmetic device 45 performs calculations based on a program to determine the sound to be output from the speaker 20, and transmits an audio signal to the amplifier device 50 based on the resulting control signal (instruction). Specific aspects of the calculations, such as the content of the calculations, will be described later. Such an arithmetic unit 45 can be configured as a computer such as a personal computer, etc. That is, in a computer having a CPU as a central processing unit and RAM, ROM, HDD, etc. as storage devices, the CPU can be configured to execute a computer program stored in the ROM or HDD using the RAM. Furthermore, the calculation by the calculation device 45 is performed for each speaker 20 individually, or for a group of multiple speakers 20. This makes it possible to more appropriately and flexibly output sound as needed.

[0049] [Amplification equipment] The amplifying device 50 is a device that receives a control signal from the arithmetic device 45, amplifies the audio signal from the predetermined sound source device 42 based on the control signal, and transmits the amplified audio signal to a speaker, and is a device that is so-called an amplifier. Such an amplifying device 50 is not particularly limited, and any known device can be used.

[0050] [Layout of each component] The above-described components are combined, for example, as follows to form the indoor structure 10. To form the interior space 1 with the interior structure 10, in this embodiment, a known ceiling material is arranged on the ceiling portion 12, and a known floor material 13 is arranged on the floor portion 13. At least one, and preferably multiple, speakers 20 are arranged on the wall portion 11. In this case, the speaker 20 is arranged so that the surface side facing material 23 faces the interior space 1. The placement of the speakers 20 on the wall 11 is determined appropriately depending on the purpose. Note that normal (non-speaker) wall materials 11a may be placed on the wall 11 in the portions where the speakers 20 are not placed.

[0051] In this case, if the design surface of the surface material on the front side of the speaker 20 and the design surface of the normal wall material 11a are the same, the speaker cannot be distinguished from the normal wall material from the outside, and the space can be made in which the speaker is not recognized. However, the present invention is not limited to this, and the design surfaces may be different from those of the speaker 20 and the wall material 11a, and each design surface may be used as an interior accent such as a painting or photograph.

[0052] The sensor 40 is placed in a location where it is easy to detect the target. The input device 41 is a means for directly inputting information to the calculation device 45, so it may be placed anywhere as long as it allows input. Similarly, the sound source device 42 may be placed in a necessary location. It should be noted that the sensor 40, the input device 41, the arithmetic device 45, and the amplification device 50 do not necessarily have to be provided, or any one or more of them may be provided.

[0053] 3, if the arithmetic device 45 is provided with either the sensor 40 or the input device 41, it is configured to receive and capture signals from these, and to transmit to the amplifier device 50 an audio signal generated from the selected sound source device 42 based on a control signal output as a result of the calculation. This capture and transmission may be wired or wireless. Therefore, the location where the arithmetic device 45 is placed is not particularly limited, and may be inside or outside the indoor space 1, in a separate room, in a separate building, etc.

[0054] As can be seen in FIG. 3, the amplifier device 50 is connected to the computing device 45 to receive signals from the computing device 45 as described above, and is connected to the vibrator 25 to transmit the amplified signals to the first speaker 20. 3, when the output of a plurality of speakers 20 is controlled individually, an amplifier device 50 is provided for each of the plurality of speakers 20. On the other hand, when a group including a plurality of speakers 20 is treated as one group and the sound output for each group is controlled, one amplifier device 50 may be provided for each group.

[0055] 1.2. Operation of the interior structure The indoor structure 10 as described above can be operated, for example, as follows. The flow of operations is shown in FIG. When at least one of the sensor 40 and the input device 41 is provided, the arithmetic device 45 receives an audio signal from them (S11). The signal from the sensor 40 is a signal of information detected by the sensor 40. The signal from the input device 41 is, for example, a signal for selecting a desired sound to the arithmetic device 45, and it is assumed that the desired sound is selected directly from a keyboard. Examples of signals from the sound source device 42 include signals from a sound reproducer such as a microphone, an audio signal recording and reproducing device such as a CD, an audio signal transmitted via a communication line, and an audio signal generated from a computer arithmetic device or storage device. Next, the arithmetic unit 45 calculates and determines the sound to be output for each speaker or for each group based on the received signal using a program (S12). If the acoustic system does not include the sensor 40, input device 41, and sound source device 42, the signal for the sound to be output is calculated and determined based on a predetermined program. The arithmetic device 45 outputs the determined signal to the amplifier 50 (S13), and the amplifier 50 receives the signal, amplifies it, and outputs it to the speaker 20 (S14). As a result, the speaker 20 outputs sound (S15). The above steps S11 to S15 are repeated to provide the desired sound as needed.

[0056] The interior structure 10 described above makes it possible to achieve both spatial design and sound environment. That is, visually, the wall coverings that make up the space are integrated with the speakers, realizing a clean and beautiful spatial design, and auditorily, different sounds can be output depending on the part of the space, ensuring diversity in the presentation of the sound environment. In addition, in this configuration, speakers are arranged in areas that have different sound range reproduction and sound propagation directions, so high-quality sound can be output in each sound range and in the way the sound is heard, resulting in an interior structure that can enhance the function of sound in the indoor space.

[0057] 2. Specific examples of sound environments Specific examples of sound environments realized by the interior structure of the present disclosure will be described below. Since the sound environments that can be realized by the interior structure of the present disclosure are diverse, the following specific examples are merely examples and are not intended to be limiting.

[0058] 2.1.Improvement of sound equipment In a space with sound equipment such as a movie theater, low-frequency sounds are provided to the speakers 20 below the wall 11, mid-frequency sounds are provided to the speakers 20 located in the center of the height direction, and high-frequency sounds are provided to the speakers 20 located above. This can improve the sense of depth and impact. Similarly, when combining images and sounds from an orchestra, international conference, or sporting event, the direction of the sound can be adjusted to match the location where the sound originates and the direction in which it travels, allowing the scene to be reproduced and transmitted in a matrix format.

[0059] 2.2.Recreating the natural environment When recreating a natural environment, the speakers 20 placed at the bottom reproduce the low-pitched sounds of a babbling river and waves, the speakers 20 placed in the center of the height direction reproduce the mid-pitched sounds of wind, and the speakers 20 placed at the top reproduce the high-pitched sounds of birdsong. This makes it possible to provide high-quality sounds appropriate for each range. Similarly, by adjusting the direction of sound travel to match the location where the sound is generated and the direction in which the sound travels, the scene can be reproduced and transmitted in a matrix format.

[0060] 2.3.Recreating scenes with moving sounds For example, in a space that recreates a scene characterized by horizontal sound movement, such as an auto racing track, many speakers are placed horizontally at the bottom to provide low-frequency sounds, thereby creating a sense of realism in the movement of sound. Similarly, by providing sound in accordance with the position and movement of the sound, the scene can be reproduced and transmitted in a matrix format.

[0061] 2.4.Selective sound transmission Situations where sound is transmitted to a specific location (for example, sound is likely to be transmitted only to the driver) or in a specific direction within a larger space (for example, sound is likely to be transmitted to a specific range within a large space) When it is necessary to transmit sound to a specific location, the direction of the sound is adjusted to transmit the sound in a way that suits the purpose. [Explanation of symbols]

[0062] 1 Indoor space 10. Indoor structure with sound system 11 Wall 12 Ceiling 13 Floor 15 Sound System 20 speakers

Claims

1. A speaker comprising a face plate and a vibrator disposed on one surface of the face plate, The face material has a core material having a honeycomb structure, The core material has regions that function to output frequencies of 50 Hz to 500 Hz as a low frequency range, 100 Hz to 5000 Hz as a mid frequency range, and 2000 Hz to 15000 Hz as a high frequency range based on sound reproducibility, The specific acoustic resistance values ​​of the respective regions are different due to the difference in the core material, thereby realizing the difference in function as the low frequency range, the mid frequency range, and the high frequency range, The core material has both a convex region and a concave region on one surface side. speaker.

2. A speaker comprising a surface material and a vibrator disposed on one surface of the surface material, The face material has a core material having a honeycomb structure, The core material has regions that function to output frequencies of 50 Hz to 500 Hz as a low frequency range, 100 Hz to 5000 Hz as a mid frequency range, and 2000 Hz to 15000 Hz as a high frequency range based on sound reproducibility, The cell density of each of the regions is decreased in the order of the low frequency range, the mid frequency range, and the high frequency range, thereby realizing the difference in function as the low frequency range, the mid frequency range, and the high frequency range; The core material has both a convex region and a concave region on one surface side. speaker.

3. 3. The speaker according to claim 2, wherein the axial directions of the cells of the honeycomb structure are different in adjacent regions of the core material.

4. An indoor structure that forms an indoor space surrounded by walls, a floor, and a ceiling, an acoustic system is disposed in the interior structure; The acoustic system comprises: A plurality of speakers according to any one of claims 1 to 3 are arranged. Indoor structure.

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