JP2010001709A - Habitable room structure considering sound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a habitable room structure considering sound which can easily form a habitable room space having excellent sound effects by using an improved Schroeder diffuser in a habitable room part to improve sound absorption coefficients from the lower register to the upper register in a balanced manner. <P>SOLUTION: In the habitable room structure considering sound, a frame body 12 whose aperture 12a opens toward the indoor side is installed on a wall 11 of the habitable room part, and an acoustic diffuser 10 made by setting a number of acoustic vibration plates 13 is installed in the frame body 12 at predetermined intervals. A number of the acoustic vibration plates 13 are disposed parallel to the direction vertically intersecting the aperture 12a, thereby forming a resonant vibration groove 14 opening toward the aperture 12a between the adjacent acoustic vibration plates 13 in the acoustic diffuser 10. Inner closing members 15 are installed inside a number of the formed resonant vibration grooves 14 at random depth positions, so that the resonant vibration grooves 14 have random depths. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a room structure in consideration of sound, and in particular, a sound absorbing diffuser in which a large number of acoustic diaphragms are arranged in parallel at predetermined intervals on a frame provided on an indoor wall surface around a living room. It relates to the room structure considering the installed sound.

  For example, in architectural acoustic design to make a large-scale space such as a concert hall or a theater excellent in acoustic effect, for example, as a sound absorbing material, a resonator type sound absorbing material having excellent sound absorption characteristics in the low frequency range, Various sound-absorbing materials such as plate (membrane) vibration-type sound-absorbing material with excellent sound-absorbing characteristics and porous sound-absorbing material with excellent sound-absorbing characteristics in the mid-high range are used. It has been attempted to balance the frequency characteristics of the sound absorption coefficient over the sound range.

  On the other hand, for example, in a general building such as a residential building, when a part of the room is to be a room having an excellent acoustic effect, in the room that is such a small space, In addition, it is difficult to secure a large space for forming excessive unevenness, and it is difficult to provide a resonator-type sound-absorbing material having a sufficient sound-absorbing characteristic in a low frequency range with a sufficient size and shape. In a small-scale space such as a living room, due to repetitive reflections between planes, a lack of sound absorption (excessive reverberation) tends to occur from low to high frequencies, especially excessive reverberation in the midrange (500 Hz band). Becomes easy to protrude. Furthermore, the excessive sound in the low / mid range masks the high range, making it difficult to hear the high range.

  In addition, for example, in a room for music use, as a sound absorption design at the time of interior planning, a design using a porous sound absorption material such as glass wool having excellent sound absorption characteristics in the middle / high range is often performed. When a quality type sound-absorbing material is used, for example, excessive sound absorption in a high frequency range of 1 kHz or more, for example, at a frequency included in addition to the overtone of the sound source << basic frequency (fundamental sound); Double, 3 times,..., 7 times (integer multiple)...

  Furthermore, it is known that increasing the acoustic diffusivity of the space is important for balancing the frequency characteristics of the room sound absorption coefficient. Therefore, the living room is hardly designed with consideration for diffusibility, and the living room is desired to have a clean space structure without excessive unevenness.

On the other hand, in a large-scale space such as a concert hall or a theater, for example, a diffuser called a Schrader diffuser may be used as a structure that enhances the acoustic diffusivity of the space (see, for example, Non-Patent Document 1). . The Schrader diffuser arranges a large number of grooves partitioned by a rigid material having a depth based on a quasi-random pseudo-random arrangement, and arranges the openings so that they form a plane, thereby changing the acoustic impedance (discontinuity). This can be realized without using a sound absorbing material.
"Room acoustics-sound of architecture and its theory-", author, Heinrich Kuttorf, translator, Junji Fujiwara, Takayuki Hidaka, August 12, 2003, published by Ichigaya Publishing Co., Ltd.

  The Schröder diffuser is considered to have a function as a resonator (resonator) by a large number of grooves having a random volume in addition to a function as a diffuser. Therefore, by installing the Schröder diffuser in a small-scale space such as a room of a building, it becomes possible to enhance the acoustic diffusibility of the small-scale space and to exhibit a function as a sound absorbing material. Although it is considered possible, various improvements are required to use the Schrader diffuser used in a large-scale space such as a concert hall or a theater in a small-scale space such as a living room of a building. In addition, by improving the Schrader diffuser used for large-scale spaces and improving its function as a sound-absorbing material, the sound absorption rate is improved in a balanced manner from low to high frequencies when used in small-scale spaces. It is desired to make it possible to easily form a superior living room space.

  By improving the Schrader diffuser and using it in the room of the building, the present invention improves the sound absorption rate in a balanced manner from the low range to the high range without providing excessive unevenness on the surrounding indoor wall surface. An object of the present invention is to provide a room structure in consideration of sound that can easily form a room space with excellent effects.

  In the present invention, a frame body having an opening surface facing the room is provided on the wall surface of the wall, ceiling, or floor that forms the living room, and a large number of acoustic diaphragms are arranged at predetermined intervals on the frame body. It is a living room structure in consideration of the sound in which the arranged sound absorbing diffuser is installed, and the plurality of acoustic diaphragms are arranged in parallel to the direction intersecting with the opening surface, thereby the sound absorbing diffuser. Are formed with resonance vibration grooves that open toward the opening surface between the adjacent acoustic vibration plates, and the inner portion of the formed resonance vibration grooves has a depth of the inner portion closing member at a random depth. The above-mentioned object is achieved by providing a living room structure that is provided at a position and that takes into account the sound having a plurality of resonance vibration grooves having a random depth.

  And the living room structure in consideration of the sound of the present invention forms notches by extending in the depth direction of the groove from the edge on the opening surface side at both side edges of each acoustic diaphragm of the sound absorbing diffuser. As a result, the sound absorption coefficient in the low sound range can be increased.

  Moreover, it is preferable that the seat structure which considers the sound of this invention covers the opening surface of the said frame body in which the said sound-absorbing diffuser was installed, and the sheet | seat member which has sound permeability is attached.

  Furthermore, in the room structure considering the sound according to the present invention, it is preferable that the multiple acoustic diaphragms are arranged in parallel in a direction perpendicular to the opening surface of the frame.

  Furthermore, in the living room structure considering the sound according to the present invention, it is preferable that the plurality of acoustic diaphragms are made of a thin plate member having a thickness of 2.5 to 5.5 mm.

  Moreover, it is preferable that the living room structure which considered the sound of this invention arrange | positions the said many acoustic diaphragms in parallel with the space | interval of 30-100 mm.

  Furthermore, in the room structure considering the sound according to the present invention, it is preferable that the multiple resonance vibration grooves are formed at random depths in the range of 0 to 380 mm.

  Furthermore, in the room structure considering the sound according to the present invention, it is preferable that the random depth of the plurality of resonance vibration grooves is a depth by a quadratic residue pseudo-random arrangement.

  Moreover, it is preferable that the opening surface of the said frame body in which the said sound-absorbing diffuser was installed is opening in the rectangular shape with a width of 600-2000 mm.

  Furthermore, in the living room structure considering the sound according to the present invention, the opening surface of the frame on which the sound absorbing diffuser is installed is 3 to 50 of the entire area of the indoor wall surface including the wall, ceiling, and floor in the living room portion. It is preferable that it is provided to occupy the area of%.

  According to the room structure in consideration of the sound of the present invention, the sound is absorbed from the low range to the high range without providing excessive unevenness on the surrounding indoor wall surface by improving the Schrader diffuser and using it in the room of the building. The room ratio can be improved in a well-balanced manner, and a room space with an excellent acoustic effect can be easily formed.

  The living room structure in consideration of sound according to the first preferred embodiment of the present invention shown in FIG. 1 is to make it possible to use, for example, a Western-style room with a size of about 6 tatamis in a residential building as a room part for music use, for example. In addition, Schroeder, which has been used in large-scale spaces such as concert halls and theaters, and has a large number of grooves with a random depth that are partitioned by a rigid material, arranged side by side so that the openings form a plane. The diffuser is improved so as to be suitable for a small-scale space to form a sound absorbing diffuser 10, and the sound absorbing diffuser 10 is provided on a wall 11 as an indoor wall surface and opens toward the room 12 a. It is comprised by installing in the wall 11 through the frame 12 which opens.

  That is, as shown in FIGS. 1 and 2, the living room structure in consideration of the sound according to the first embodiment has an opening surface 12a facing the room on the wall 11 which is the inner wall surface of the side peripheral surface forming the living room portion. Is a living room structure in which a sound absorbing diffuser 10 in which a large number of acoustic diaphragms 13 are arranged at predetermined intervals is provided on the frame 12, and a large number of acoustic vibrations are provided. The plate 13 is arranged in parallel to the direction intersecting the opening surface 12a, so that the sound absorbing diffuser 10 has a resonance vibration groove 14 that opens between the adjacent acoustic vibration plates 13 toward the opening surface 12a. The inner portion of the formed resonance vibration grooves 14 is provided with a depth closing member 15 at a random depth position, and the plurality of resonance vibration grooves 14 have a random depth. ing.

  Further, in the first embodiment, the large number of acoustic diaphragms 13 of the sound absorbing diffuser 10 are arranged in parallel in the direction perpendicular to the opening surface 12a of the frame 12 with an equal interval of about 40 mm, for example. ing. Furthermore, in the present embodiment, the opening surface 12a of the frame body 12 opens in a vertically long rectangular shape having a width of about 800 mm and a height of about 1925 mm, for example, from the vicinity of the floor 26 of the living room to the ceiling 21. In addition, it is provided so as to extend in a direction perpendicular to the floor 26 and the ceiling 21, and occupies an area of 3.3% of the total area of the indoor wall surface including the wall 11, the ceiling 21, and the floor 26 in the living room. Open. Each acoustic diaphragm 13 is attached along a horizontal plane parallel to the floor 26 and the ceiling 21.

  In the first embodiment, the multiple acoustic diaphragms 13 constituting the sound-absorbing diffuser 10 are made of coniferous plywood having a thickness of, for example, about 3 mm, and are, for example, rectangular planar shapes having a size of about 400 mm in length and about 800 mm in width. It has. The acoustic diaphragm 13 is mounted horizontally, with the opening surface 12a being substantially flush with the wall surface of the wall 11 and with both side edges supported by the frame body 12 embedded and installed inside the wall 11, A sound absorbing diffuser 10 composed of a large number of acoustic diaphragms 13 is formed.

  In the first embodiment, the frame body 12 on which the sound-absorbing diffuser 10 is installed is a box-shaped outer shell body having a hollow vertical rectangular parallelepiped shape whose front surface opens as an opening surface 12a. The frame body 12 is embedded and fixed in the wall 11 of the living room with the opening surface 12a opened to the room. As shown in FIG. 2, a large number of wooden strips 16 having a width of, for example, about 40 mm extend in the horizontal direction and are spaced at an interval of, for example, about 3 mm, inside the side surfaces 12 b on both sides of the frame 12. And are arranged parallel to each other. As a result, guide support grooves 17 that insert and lock both side edges of the acoustic diaphragm 13 to support the both side edges are provided at intervals between the adjacent band plates 16, and the side surfaces 12 b on both sides of the frame body 12. Are arranged at the same height facing each other.

  Moreover, in this 1st Embodiment, many wooden back part obstruction | occlusion members 15 are arranged on both sides of the pair of strips 16 on both sides at the same height arranged opposite to each other inside the frame 12. Are attached and fixed so as to cross between the side surfaces 12b on both sides of the frame body 12 in the horizontal direction. The back portion blocking member 15 has a rectangular cross section having a size of about 40 mm in length and 30 mm in width, and extends in parallel with the opening surface 12 a of the frame 12 between each pair of both side strips 16. Then, it is attached so as not to protrude into the guide support groove 17.

  Here, the back portion blocking member 15 is attached to a random depth position from the opening surface 12 a of the frame body 12. Both side edges are inserted and locked in the guide support grooves 17 on both sides disposed at the respective height positions, and a large number of acoustic diaphragms 13 are respectively inserted into the frame body 12 while being guided by the guide support grooves 17. When pushed in and attached, the back closing member 15 closes the back of the resonance vibration groove 14 formed between each pair of adjacent acoustic vibration plates 13 with a random depth. Thereby, as shown in FIG. 3, resonance vibration grooves 14 having a random depth that open toward the opening surface 12 a are formed between the adjacent acoustic vibration plates 13 inside the frame body 12. The sound-absorbing diffuser 10 of this embodiment is installed.

  In the first embodiment, preferably, the random depth of the multiple resonance vibration grooves 14 whose back portions are closed by the back portion closing member 15 inside the frame 12 is the depth by the quadratic pseudo-random arrangement. It has become. The quadratic residue pseudo-random array is a well-known one that is employed when designing a Schrader diffuser for use in a large-scale space, for example. By forming a large number of resonance vibration grooves 14 at a depth based on the quadratic residue pseudo-random arrangement, a well-balanced diffusivity from the low sound range to the high sound range can be obtained, and for example, the volume of the resonance vibration groove 14 becomes a random size. Thus, when the sound absorbing diffuser 10 exhibits a function as a resonator (resonator), it is possible to effectively improve the sound absorption rate in a balanced manner from the low sound range to the high sound range.

  In the first embodiment, preferably, as shown in FIG. 4, resonance vibration is generated from the side edge 13 a on the opening surface 12 a side of the frame body 12 on both side edges of each acoustic diaphragm 13 of the sound absorbing diffuser 10. The cut 18 can be formed by extending in the depth direction of the groove 14. The notch 18 is, for example, at a portion adjacent to the side surface 12b of the frame 12 inside the portion inserted and locked in the guide support groove 17 at both side edges of each acoustic diaphragm 13 along the side surface 12b. It can be formed extending in parallel with this. Since the notches 18 are formed, the main body portion, which is a portion sandwiched by the notches 18 on both sides of each acoustic diaphragm 13, is supported by only one side on the back closing member 15 side, and is cantilevered. It will overhang, and it becomes easy to produce an acoustic vibration. As a result, it is possible to further effectively improve the sound absorption coefficient due to plate (film) vibration described later, and it is possible to effectively improve the sound absorption coefficient particularly in the low sound range. The cut length of the cut 18 in the depth direction of the resonant vibration groove 14 can be appropriately set in consideration of the balance of sound absorption coefficient and the like.

  Further, in the first embodiment, preferably, a sound-permeable sheet member 19 (see FIG. 9) can be attached so as to cover the opening surface 12a of the frame body 12 on which the sound absorbing diffuser 10 is installed. As the sheet member 19 having sound permeability, various sheet materials known as sheet members having sound permeability, such as trade name “FAB-ACE” (manufactured by Kawashima Textile Cellcon Co., Ltd.) can be used. By covering the opening surface 12a of the frame body 12 and attaching a sheet member 19 having sound permeability, the sound absorbing diffuser 10 in which a large number of acoustic diaphragms 13 are arranged in parallel at predetermined intervals is covered. It is possible to conceal and form a clean room space without impairing the design of the room.

  Here, in the present invention, various plate members such as a softwood plywood, a hardwood plywood, a synthetic resin board such as an acrylic panel, and a corrugated paper board can be used as the multiple acoustic diaphragms 13. The acoustic diaphragm 13 is preferably made of a thin plate member having a thickness of 3.5 to 5.5 mm. If the thickness of the acoustic diaphragm 13 is too thick, the sound absorption function due to the plate vibration is lowered, which causes a problem that the sound absorption coefficient in the middle / low range is lowered, and the thickness of the acoustic diaphragm 13 is thin. If it is too large, plate vibrations will occur excessively, causing problems such as the vibration sound (billing) of the diaphragm itself.

  Moreover, it is preferable that many acoustic diaphragms 13 are arranged in parallel with an interval of 30 to 100 mm. If the distance between the adjacent acoustic diaphragms 13 is too wide, the total number of randomly arranged resonant vibration grooves 14 will be reduced, resulting in a problem that the diffusion function is lowered and the balanced sound absorption is lost. If the distance between the acoustic diaphragms 13 is too small, the volume of each resonance vibration groove 14 decreases, so that the resonance frequency of the groove shifts to the middle / high sound range, and the sound absorption coefficient in the middle / high sound range increases. As a result, there is a problem that sound absorption with a good balance is lost.

  Furthermore, it is preferable that the large number of resonant vibration grooves 14 are formed at random depths in the range of 0 to 380 mm. If the range of the random depth of the large number of resonant vibration grooves 14 is too large, it becomes easy to compress the living space, and if the range of the random depth of the large number of resonance vibration grooves 14 is too small, the diffusion limit frequency of the low range is low. As a result of the increase, the low-frequency diffusion function decreases and the groove volume decreases, resulting in a problem that the resonance frequency of the groove increases and the sound absorption effect in the low-frequency range decreases.

  Furthermore, the opening surface 12a of the frame 12 where the sound absorbing diffuser 10 is installed occupies an area of 3 to 50% of the entire area of the indoor wall surface including the wall 11, the ceiling 21, and the floor 26 in the living room. It is preferably provided, and particularly preferably provided so as to occupy an area of 3 to 25%. If the ratio of the opening surface 12a of the frame body 12 on which the sound absorbing diffuser 10 is installed to the wall surface of the room is too large, the living space is easily compressed, and the opening surface 12a of the frame body 12 on which the sound absorbing diffuser 10 is installed If the proportion of the room wall surface is too small, the effect of installing the sound absorbing diffuser 10 may not be fully recognized.

  And according to the room structure which considered the sound of this 1st Embodiment which has the above-mentioned structure, by installing and using the sound-absorbing diffuser 10 which improved the Schrader diffuser in the wall 11 of the room part, Without providing excessive unevenness on the wall surface of the room, it is possible to improve the sound absorption rate in a well-balanced manner from the low range to the high range, and to easily form a living room with an excellent acoustic effect.

  That is, according to the first embodiment, the sound-absorbing diffuser 10 is configured by arranging a large number of acoustic diaphragms 13 parallel to the frame body 12 at a predetermined interval. Since a large number of resonance vibration grooves 14 having a random depth that opens toward the opening surface 12a of the frame 12 are formed in the portion, the acoustic diffusivity of the living room space is enhanced as in the case of the Schrader diffuser. In addition, a large number of grooves having a random volume can function as a well-balanced resonator (resonator) from the low range to the high range. In addition, the resonance vibration groove 14 is not partitioned by a rigid material, but is partitioned by the acoustic vibration plate 13 that vibrates due to sound. Therefore, the plate of the acoustic vibration plate 13 that partitions the resonance vibration groove 14 having a random depth. (Membrane) The sound absorption effect due to vibrations, combined with the sound absorption effect as a resonator of the resonant vibration groove 14 of random depth, improves the sound absorption rate of the living room in a well-balanced manner from the low range to the high range. Therefore, it is possible to easily form a room space with excellent acoustic effect.

  FIG. 5 shows a main part of a living room structure considering sound according to a second preferred embodiment of the present invention. According to the second embodiment, a pair of sound absorbing diffusers 10 ′ having the same configuration as the sound absorbing diffuser 10 used in the living room structure of the first embodiment is embedded in the ceiling 21 of the living room and opened. A large number of acoustic diaphragms 13 are arranged in parallel and attached to a frame body 12 whose surface 12a is opened downward toward the room. Even with the living room structure of the second embodiment, the sound absorbing diffuser 10 ′ provides the same effect as the living room structure of the first embodiment. The living room structure of the present invention can also be formed by providing a sound absorbing diffuser on the floor of the living room.

  FIG. 6 shows a main part of a living room structure considering sound according to a preferred third embodiment of the present invention. According to the third embodiment, the sound-absorbing diffuser 20 is formed using, for example, corrugated paper 22 and a rod-shaped member 23 made of foam heat insulating material, for example, 400 mm long, horizontal, as shown in FIGS. The sound absorbing diffuser unit 24 having a rectangular parallelepiped shape having a size of about 800 mm and a height of about 265 mm is formed by burying and installing a plurality of sound absorbing diffuser units 24 on the wall 11 of the living room.

  According to the third embodiment, in order to form the sound absorbing diffuser unit 24, for example, a corrugated cardboard paper 22 having a rectangular planar shape with a size of about 400 mm in length and about 800 mm in width and having a thickness of about 3 mm is used as an acoustic diaphragm. 13, a rod-like member 23 made of a foamed heat insulating material having a rectangular cross section having a size of about 40 mm in length and 30 mm in width is used as a frame member 25 and a back portion closing member 17 on the surface thereof, using an adhesive or the like. (See FIG. 7). That is, for example, the rod-like member 23 cut to a length of about 400 mm is attached as a frame member 25 along the short sides on both sides of the cardboard paper 22. Further, for example, the rod-shaped member 23 cut to a length of about 740 mm is used as the back closing member 17, and both ends are abutted and joined to the inner side surfaces of the frame members 25 on both sides, and the end on the opening surface 12 a side of the acoustic diaphragm 13. It is attached to a position away from one long side 22a of the corrugated paper 22 serving as the side 13a by a predetermined length obtained by the square remainder pseudo-random arrangement.

  Further, the upper corrugated paper 22 is attached so as to cover the upper surfaces of the attached frame member 25 and the back closing member 17, and the same operation is repeated and stacked, for example, in six steps, so that the acoustic vibration plate by each adjacent corrugated paper 22 is obtained. A sound absorbing diffuser unit 24 having a size and shape that is lightweight and suitable for carrying and construction, in which resonance vibration grooves 14 having random depths are provided between 13 and 13 is easily formed (FIG. 8). reference).

  In the third embodiment, the sound-absorbing diffuser unit 24 is stacked and attached, for example, in eight stages vertically while being fitted into a pair of opening recesses 27 provided adjacent to the wall 11 of the living room. As a result, a rectangular shape is formed by a large number of frame members 25 on both sides arranged integrally in the vertical direction with the side edges of the cardboard paper 22 interposed therebetween, and the cardboard paper 22 arranged on the top and bottom. A sound absorbing diffuser 20 in which a large number of acoustic diaphragms 13 made of corrugated paper 22 are arranged in parallel inside the frame 12 is formed as a frame 12 having an opening 12a facing the outer shell portion toward the room. , Will be installed in two adjacent locations.

  Even with the living room structure of the third embodiment, the sound absorbing diffuser 20 has the same effect as the living room structure of the first embodiment. Further, since the sound absorbing diffuser unit 24 is used as the constituent material of the sound absorbing diffuser 20, the sound absorbing diffuser unit 24 is manufactured in advance in a factory or the like, so that the work of assembling the sound absorbing diffuser 20 at the construction site can be simplified and performed. It becomes possible to carry out easily.

  FIGS. 9A to 9C show the main part of a living room structure considering sound according to the fourth preferred embodiment of the present invention. According to the fourth embodiment, the sound-absorbing diffuser 30 is not provided by being embedded in the wall 11 or the ceiling 21 of the living room, but the back surface is placed along the wall surface of the wall 11 or the ceiling 21 of the living room. Thus, it is provided in the room part in the state arrange | positioned inside the sound absorption diffusion cabinet 31 attached. That is, in the fourth embodiment, as shown in FIG. 9A, the sound absorption diffusion cabinet 31 includes a large number of acoustic diaphragms 13 inside a vertically long rectangular parallelepiped frame 32 having an opening surface 32a. Is provided by providing a sound-absorbing diffuser 30 that is arranged in parallel at a predetermined interval. Further, a sound-transmitting sheet member 19 is attached so as to cover the front surface which is the opening surface 32a of the frame 32, and the sound-absorbing diffuser 30 by the large number of acoustic diaphragms 13 is obscured to absorb the sound-absorbing diffusion cabinet 31. The design is clean and excellent in design.

  According to this 4th Embodiment, as shown in FIG.9 (b), (c), for example, the corner part of the wall 11 in a living room part, the wall 11 and the sound absorption diffusion cabinet 31 provided with the sound absorption diffuser 30 are used. By attaching to the joint angle part with the ceiling 21, the sound absorbing diffuser 30 has the same effect as the room structure of the first embodiment without causing excessive unevenness on the wall surface around the room part. Will play. Further, since it is not necessary to embed the sound absorbing diffuser 30 in the wall 11 or the ceiling 21 of the living room portion, the sound absorbing diffuser 30 can be easily made as necessary when, for example, the living room portion is reformed after the building is constructed. Can be installed or removed.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, a large number of acoustic diaphragms do not necessarily have to be arranged in parallel to the direction perpendicular to the opening surface of the frame, and may be arranged in a direction that obliquely intersects with the opening surface of the frame. . Further, the frame on which the sound absorbing diffuser is installed does not necessarily have a rectangular parallelepiped shape with an open front surface, and may be a frame with an open front surface and a back surface, for example. The opening surface of the frame body whose opening surface opens toward the room does not necessarily have to be opened in a rectangular shape, and may be opened in various other shapes. Furthermore, the random depths of the multiple resonant vibration grooves do not necessarily have to be random depths due to the quadratic pseudo-random arrangement.

  Hereinafter, although the living room structure in consideration of the sound of the present invention will be described in more detail by examples and comparative examples, the present invention is not limited to these.

[Example 1]
The living room structure having substantially the same structure as the living room structure of the first embodiment shown in FIG. 1 is used as the living room structure of Example 1, and the average sound absorption rate and reverberation time from the low frequency range to the high frequency range are obtained by the following method. It measured and compared with the average sound absorption rate and reverberation time of the room part measured in the state which does not install a sound-absorbing diffuser. The measurement results are shown in FIG. In addition, as a large number of acoustic diaphragms constituting the sound absorbing diffuser, a 3 mm thick Falcater plywood was used instead of the softwood plywood of the first embodiment. Moreover, the opening area of the opening surface of the frame was 1.54 m ² , and occupied an area of 3.2% of the total area of the indoor wall surface including the wall, ceiling, and floor in the living room.

[Example 2]
Living room structure having the same configuration as that of the first embodiment except that notches are formed on both side edges of each acoustic diaphragm constituting the sound absorbing diffuser from the edge on the opening surface side to the back closing member. As the living room structure of Example 2, the average sound absorption rate and reverberation time from the low range to the high range are measured by the following method, and the average sound absorption rate and reverberation of the room portion measured without installing the sound absorbing diffuser are measured. Compared with time. The measurement results are shown in FIG.

[Comparative Example 1]
When the standard specification that does not use sound-absorbing material, and the case where a porous sound-absorbing material is attached to the ceiling, a Western-style room having a size of about 6 tatamis as in the first embodiment is used as a measuring room. Attaching a porous sound-absorbing material to the ceiling and attaching a porous sound-absorbing material with a width of 2 to one side of the wall, and attaching a porous sound-absorbing material to the ceiling and facing the wall In the case where a porous sound-absorbing material with a width of 2 was attached to the two surfaces, the average sound absorption rate from the low sound range to the high sound range was measured by the following method, and these were compared. The measurement results are shown in FIG. In addition, as the sound absorbing material to be attached to the ceiling, the product name “Ototen” (manufactured by Daiken Kogyo Co., Ltd.) is used. As the sound absorbing material to be attached to the wall, the product name “FAB-ACE” (manufactured by Kawashima Textile Cellcon Co., Ltd.) is used. used.

[Measurement method of average sound absorption rate and reverberation time]
The average sound absorption rate and reverberation time are measured using a digital reverberation measuring device (YAMAHA AS-2) 40, a microphone 41, and an amplifier built-in speaker 42 as shown in FIG. 14, for example. First, the reverberation time for each 1/1 octave frequency band measured by the digital reverberation measuring device 40 (time until the acoustic energy density after the sound source stops becomes 10 ⁻⁶ times (= −60 dB) after steady state) is obtained. . That is, a signal is generated from the digital reverberation measuring device 40 and output from the speaker 42, and the microphone 41 receives sound at several points in the room, and the digital reverberation measuring device 40 obtains an average value of each point. Measurement is performed in eight bands of a 1/1 octave center frequency of 63 Hz to 8 kHz, and an average value is calculated for each measurement point to obtain the reverberation time of the room. Next, the average reverberation time, the room volume, and the entire area of the indoor wall surface are applied to Sabin's reverberation formula to calculate the average sound absorption coefficient. The principle of this reverberation time measuring instrument (impulse inverse integration method) is also described in M.S. R. Based on Schröder's idea.

  According to the measurement results of the average sound absorption rate of Example 1, Example 2 and Comparative Example 1 shown in FIGS. 10 to 12, in Comparative Example 1, a specification in which a porous sound absorbing material is attached to the standard specification. No increase in the average sound absorption coefficient was observed in the region of 63 Hz and 125 Hz, and it was found that there was a lack of balance in improving the sound absorption coefficient. On the other hand, in Example 1 and Example 2, in the specification in which the sound absorbing diffuser is installed with respect to the specification in which the sound absorbing diffuser is not installed, the sound absorption rate is improved in a well-balanced manner from the low range to the high range. It turns out that Further, in Example 2 in which notches are formed in both side edges of each acoustic diaphragm of the sound absorbing diffuser, the sound absorption coefficient in the low sound range, which is difficult to improve the sound absorption coefficient in a conventional small-scale space, is effective. It turns out that it is improving.

Example 3
By measuring the average sound absorption coefficient from the low frequency range to the high frequency range by the above-mentioned method, with the room structure having substantially the same configuration as the room structure of the first embodiment shown in FIG. 1 as the room structure of Example 3, The change in the sound absorption rate due to the difference in the number of acoustic diaphragms constituting the sound absorbing diffuser was verified. The measurement results are shown in FIG. In addition, as a large number of acoustic diaphragms constituting the sound-absorbing diffuser, Falcater plywood, cardboard board A, cardboard board B, acrylic board, conifer plywood A, conifer plywood B, and Pradan are used, and the sound-absorbing diffuser is not installed. It was compared with the average sound absorption coefficient of the living room part measured by.

  According to the measurement result of Example 3 shown in FIG. 13, it is found that the improvement of the sound absorption coefficient is almost the same when any of the above materials is used as the acoustic diaphragm. Therefore, it is considered that the basic sound absorbing performance by the sound absorbing diffuser is influenced by the shape of the resonant vibration groove rather than the material of the acoustic diaphragm. In other words, even if the material of the acoustic diaphragm changes, the volume of each resonance vibration groove having a random depth does not change, so there is no change in the resonance frequency that each resonance vibration groove has, and the resonance frequency. On the other hand, it is considered that the acoustic diaphragm causes plate vibration resonance. In addition, it was confirmed that a part of the acoustic diaphragm that partitions the resonant vibration grooves having different depths resonates when a voice is produced in the room and each acoustic diaphragm is touched with a finger according to the pitch of the voice. .

It is a principal part perspective view explaining the structure of the room structure which considered the sound which concerns on preferable 1st Embodiment of this invention. It is a principal part expansion perspective view explaining the condition of assembling a sound-absorbing diffuser in the living room structure which considered the sound which concerns on preferable 1st Embodiment of this invention. FIG. 2 is a schematic cross-sectional view taken along AA in FIG. 1. FIG. 5 is a schematic cross-sectional view taken along line BB in FIG. 3 for explaining a state in which cuts are formed in both side edges of an acoustic diaphragm constituting the sound absorbing diffuser. It is a principal part perspective view explaining the structure of the room structure which considered the sound which concerns on preferable 2nd Embodiment of this invention. It is a principal part perspective view explaining the structure of the room structure which considered the sound which concerns on preferable 3rd Embodiment of this invention. It is a perspective view explaining the condition which assembles the sound-absorbing diffuser unit which comprises the sound-absorbing diffuser used in the room structure which considered the sound which concerns on preferable 3rd Embodiment of this invention. It is a perspective view of a sound absorption diffuser unit. (A) is a perspective view of a sound absorption diffusion cabinet, (a), (b) is a schematic perspective view of a room structure considering sound according to a fourth preferred embodiment of the present invention in which the sound absorption diffusion cabinet is installed in the room part. FIG. 3 is a chart showing measurement results of average sound absorption rate and reverberation time in Example 1. 6 is a chart showing measurement results of average sound absorption rate and reverberation time in Example 2. 10 is a chart showing measurement results of average sound absorption coefficient in Comparative Example 1. 10 is a chart showing measurement results of average sound absorption coefficient in Example 3. It is a block diagram of the apparatus used for the measurement of an average sound absorption coefficient and reverberation time.

10, 10 ', 20, 30 Sound absorbing diffuser 11 Wall (interior wall surface)
12, 32 Frame body 12a, 32a Open surface 12b of frame body Side surface 13 of acoustic frame 13 Acoustic diaphragm 13a Edge 14 of acoustic diaphragm on the opening surface side Resonance vibration groove 15 Back portion closing member 16 Band plate 17 Guide support groove 18 Cutting 19 Sheet member 21 having sound permeability Ceiling 22 Corrugated paper 23 Bar-shaped member 24 made of foam heat insulating material Sound absorbing diffuser unit 25 Frame member 26 Floor 31 Sound absorbing diffusion cabinet

Claims (10)

Provided on the wall surface of the wall, ceiling, or floor that forms the living room section is a frame body with an opening surface facing the room, and a large number of acoustic diaphragms are arranged at predetermined intervals on the frame body It is a room structure in consideration of the sound in which the sound absorbing diffuser is installed,
The plurality of acoustic diaphragms are arranged in parallel to the direction intersecting with the opening surface, so that the sound absorbing diffuser has resonance vibration grooves that open toward the opening surface between adjacent acoustic diaphragms. Formed,
Inside the numerous resonant vibration grooves formed, the back blocking member is provided at a random depth position, and the multiple resonant vibration grooves take into account the sound having a random depth. Living room structure.   The sound according to claim 1, wherein notches are formed in both side edges of each acoustic diaphragm of the sound-absorbing diffuser so as to extend from the edge on the opening surface side in the depth direction of the groove. Living room structure.   The room structure considering sound according to claim 1 or 2, wherein a sheet member having sound permeability is attached so as to cover an opening surface of the frame on which the sound absorbing diffuser is installed.   The room structure considering sound according to any one of claims 1 to 3, wherein the plurality of acoustic diaphragms are arranged in parallel to a direction perpendicular to an opening surface of the frame.   The room structure considering sound according to any one of claims 1 to 4, wherein the plurality of acoustic diaphragms are made of a thin plate member having a thickness of 2.5 to 5.5 mm.   The living room structure considering sound according to any one of claims 1 to 5, wherein the plurality of acoustic diaphragms are arranged in parallel at intervals of 30 to 100 mm.   The room structure considering sound according to any one of claims 1 to 6, wherein the plurality of resonance vibration grooves are formed at random depths in a range of 0 to 380 mm.   The room structure considering sound according to any one of claims 1 to 7, wherein a random depth of the plurality of resonance vibration grooves is a depth based on a quadratic pseudo-random arrangement.   The room structure considering sound according to any one of claims 1 to 8, wherein an opening surface of the frame body on which the sound absorbing diffuser is installed has a rectangular shape with a width of 600 to 2000 mm. The opening surface of the frame on which the sound absorbing diffuser is installed is provided so as to occupy an area of 3 to 50% of the entire area of the indoor wall surface in the living room. Living room structure considering the described acoustics.

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