JPH05148919A - Wall surface member for sound and wall surface for sound - Google Patents

Abstract

PURPOSE:To provide an acoustic space with a wide frequency range, less standing wave and echo interference, by reflecting and spreading sound ranging to lower frequencies than usual. CONSTITUTION:In an acoustic wall surface member a sound absorber 5 is arranged at the outer circumferential part on the front face of a substantially parallelpiped cabinet 1 the aspect ratio of the front buffle of which is integer times of each reference size, so that the sound absorbing ratio becomes 10-40% in the total projection area average of buffle. On the inner circumferential part of a sound absorbing part 5 a polygonal reflector 2 protruding from the front buffle surface is provided to form a sound reflection cabinet 6. A sound absorbing part for absorbing sound is arranged in the wall surface for generation at a substantialy center line of the inner wall of a reproduced space composed of a plurality of sound reflection cabinets 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is characterized by vertical and horizontal dimensions.
The present invention relates to an acoustic wall member for providing an ideal acoustic space by combining a plurality of acoustic members each having a reference dimension or an integral multiple thereof, and an acoustic wall surface using the same.

[0002]

2. Description of the Related Art In recent years, it has become mainstream to realize an ideal sound reproduction space by optimally arranging acoustic members having sound absorbing, reflecting and sound insulating functions in a room.

As a reflection material used for this purpose, there is conventionally an acoustic member having a polyhedron-shaped projection as shown in FIG. Hereinafter, description will be given with reference to the drawings.

A reflector is used for reflecting and diffusing sound to obtain a reverberation, and for eliminating standing waves and echo disturbances. As shown in FIG. 6, a projection 2 having, for example, a polyhedron shape is provided on the baffle surface of the cabinet 1 so that sound is reflected by the projection surface. As shown in FIG. 7, a reflection cabinet 3 having the same shape and a similar shape is used. The sound absorbing cabinet 4 is combined to form a wall surface to realize a sound reproduction space.

[0005]

However, in the conventional reflection cabinet described above, the frequency of the sound reflected and diffused is λ, where λ is the wavelength and a is the side length of the polyhedron and b is the height. , A≈ (λ / 2) (1) b ≧ (a / 3) (2) Moreover, the frequency represented by the equation (1) is a frequency at which reflection and diffusion start, and sound is hardly reflected and diffused at this frequency. Therefore, there is a problem that a sound with a low frequency is not reflected and diffused so that a sufficient reverberation characteristic cannot be obtained, or a standing wave or an echo disturbance cannot be removed. The present invention solves the above problems and realizes excellent reverberation characteristics by reflecting and diffusing sound from a lower frequency, eliminating standing waves and echo disturbances, and realizing excellent acoustic effects. It is an object.

[0006]

In order to achieve the above-mentioned object, the present invention has an outer periphery of the front surface of a substantially rectangular parallelepiped cabinet or a square or rectangular panel in which the vertical and horizontal dimensions of the front baffle are each an integral multiple of the reference dimension. A sound absorbing portion that absorbs sound is disposed at a portion in contact with at least two sides of the portion so that the sound absorbing coefficient is 10 to 40% on average of all projection surfaces of the baffle, and the front baffle portion other than the sound absorbing portion is disposed. In the above, a polyhedron-shaped reflector protruding from the surface is provided to constitute an acoustic wall member, and a sound absorbing portion that absorbs sound is arranged substantially on the center line of the inner wall of the reproduction space. In the part, a plurality of the above acoustic wall members are arranged,
The acoustic wall surface is configured such that the average sound absorption coefficient of the wall surface is 10 to 40%.

[0007]

According to the present invention, since the sound absorbing portions are arranged at intervals as long as the length of the side of the cabinet or panel as a function of the acoustic wall member according to the above structure, the sound having the wavelength equal to this interval is reflected and diffused. It is possible to lower the frequency at which reflection and diffusion can be performed.

Further, when a wall surface for sound is constructed by using this wall member for sound, a sound absorbing cabinet or a sound absorbing panel is arranged substantially on the center line of the wall surface of the room to reflect and diffuse the sound of the wavelength equal to the inner size of the room. The standing wave can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram showing an acoustic wall member according to an embodiment of the present invention. The figure (a) is a front view,
(B) is a side view. As shown in the drawing, sound is absorbed in the outer peripheral portion of the front of the cabinet 1 which is a substantially rectangular parallelepiped having vertical and horizontal dimensions of the front baffle each being an integral multiple of 1 times, 2 times, ... The sound absorbing material 5 is configured with a projected surface area ratio such that the sound absorbing force (product of area and sound absorbing coefficient) is 10 to 40%. Since the sound absorption coefficient varies depending on the sound absorbing material, the effective area is the product of the sound absorbing coefficient and the area. Therefore, if a sound absorbing material having a sound absorbing coefficient of 100% is used, the surface area ratio in the total projected area of the baffle is 10 to 40. %. This numerical value can create an environment most suitable for sound reproduction when a sound space is created and the sound absorption coefficient is in this range. Glass wool or foam is used as the sound absorbing material. A reflector 2 made of a polyhedron is provided on the inner peripheral portion of the sound absorbing member on this surface. The shape of the reflector is not limited to that shown in the figure, and may be any shape that reflects sound geometrically.

The reflection cabinet 6 constructed in this way
2 are connected to form the sound reproduction wall surface shown in FIG. A sound absorbing material may be filled inside the cabinet 1 and the reflector 2 to prevent unnecessary resonance.

The operation of the above structure will be described. Since the sound absorbing material 5 is arranged on the outer peripheral portion of the front surface of the cabinet 1, the wall surface 7 formed by connecting a large number of the sound absorbing material 5
The sound absorbing material is arranged at intervals of vertical and horizontal dimensions of the cabinet front baffle. When sound is incident on such a wall surface, part of the sound is absorbed by the sound absorbing material 5 and the rest is reflected by the reflector 2. Therefore, sound is absorbed and reflected at the boundary between the sound absorbing material 5 and the reflector 2, and the sound pressure phase changes, so that interference occurs. Therefore, the sound field is disturbed and the sound is reflected and diffused on the wall surface. The frequency of this diffused sound depends on the arrangement interval of the sound absorbing material, and is remarkable when the wavelength λ is equal to the arrangement interval. This is a half of the frequency having the wavelength expressed by the equation (1), and it is possible to reflect and diffuse the sound having a lower frequency than that of the case where the geometric reflector has the size of the cabinet.

Further, since the reflector 2 inside the sound absorbing material 5 reflects and diffuses the sound of high frequency, it is possible to realize a reflection cabinet having a wide frequency range.

In this embodiment, the sound absorbing material 5 of the reflection cabinet 6 is arranged around the reflector 2. However, in actual use, since a plurality of reflection cabinets 6 are continuously arranged, at least the baffle of the cabinet 1 is arranged. Even if the sound absorbing material is provided on two sides and the reflector 2 is provided on the remaining surface, the same effect can be obtained.

By using a plurality of the reflection cabinets 6,
An embodiment for realizing a space for sound reproduction will be described with reference to FIG. 3, which is a perspective perspective view showing another embodiment of the present invention.

In the figure, only one surface of the wall is shown and the other wall surfaces are omitted. In FIG. 3, 6 is a reflection cabinet shown in FIG. 1, 4 is a sound absorbing cabinet, and a sound absorbing material is stuck on the entire surface, so that the sound absorbing power is high. In addition, a speaker that reproduces sound or a sound insulation cabinet may be incorporated. The sound absorbing cabinet 4 that absorbs sound is located at the center of the wall surface. By combining the surface area of the sound absorbing cabinet 4 and the surface area of the reflecting cabinet 6, the reflectance of the reflecting cabinet 6 is adjusted so that the reflectance is 10 to 40% in the total projected surface area.

The sound absorbing cabinet 4 and the reflecting cabinet 6 are attached to the wall surface by preliminarily forming a frame and fitting them, or by fitting a corresponding portion of the cabinet to a hook portion provided on the wall surface (neither is shown). To do.

The operation of the above configuration will be described.
Usually, in such a rectangular parallelepiped room, a standing wave is generated at a frequency whose wavelength is equal to the inner size of the room, and the sound reproduction characteristic is deteriorated.
The velocity distribution in the room when a standing wave is generated is as shown in Fig. 4.
Speed increases near the center of the room. In the embodiment of FIG. 3, since the sound absorbing cabinet 4 is arranged in the central portion where the speed is high, the sound absorbing effect is enhanced. Further, as shown in FIG. 5, the mirror image effect causes the sound absorbing material to be virtually arranged at the inner space of the room as shown by the broken line, so that the sound of the frequency at which the standing wave is generated can be diffusely reflected. ..

The surface area of the sound absorbing material is the sum of the product of the sound absorbing coefficient of the sound absorbing material and the surface area of the sound absorbing material plus the product of the sound absorbing coefficient of the sound absorbing material of the reflection cabinet and the surface area of the sound absorbing material. The total sound absorption coefficient is 10-40 on average by surface area
By arranging so as to become a percentage, it is possible to inevitably realize a sound reproduction space with a sound absorbing force of 0.1 to 0.4, and the frequency at which it can be reflected and diffused becomes low as described above, and standing waves are prevented. be able to.

In FIG. 3, the sound absorbing cabinet 4 is provided perpendicularly to the wall surface, but if it is also provided horizontally at substantially the center above and below the wall surface, vertical standing waves are also prevented. be able to.

In the above embodiment, the sound absorbing cabinet 4 or the reflecting cabinet 6 in addition to the sound absorbing cabinet 4 may be stacked, and each of them may be rearranged according to the situation of the space to set an optimum sound field. Also, the size of the sound absorbing cabinet 4 and the reflecting cabinet 6 is not limited to one kind, and even if a plurality of different sizes are combined such that the vertical and horizontal dimensions of the front baffle are each an integral multiple of the reference dimension. It's good.

Further, in the above-mentioned embodiment, the cubic reflection cabinet 6 and the sound absorbing cabinet 4 which can be easily rearranged are used. However, in order to fix them fixedly, the cabinet 1 of FIG. 1 may be a thin panel. Good. Similarly, the sound absorbing cabinet may be a sound absorbing panel.

[0022]

As is apparent from the above description, according to the present invention, since the sound absorbing portions are arranged at the intervals determined by the length of the front side of the cabinet or panel, the sound of the wavelength equal to this interval is generated. Since it can be reflected and diffused, and high frequencies can be reflected and diffused by the inner geometrical reflector, it is possible to realize an acoustic wall member and an acoustic wall surface having a wide frequency range that can be reflected and diffused.

Further, by disposing the sound absorbing cabinet at the center position of the wall surface of the room, it is possible to reflect and diffuse the sound having the wavelength equal to the inner size of the room and reduce the standing wave.

As described above, since the acoustic wall member of the present invention and the acoustic wall member using the same reflect and diffuse sound from a lower frequency, sufficient reverberation characteristics can be obtained, and further standing waves and echo disturbances can be obtained. Can be removed to achieve excellent acoustic effects.

[Brief description of drawings]

FIG. 1A is a front view showing the structure of an acoustic wall member according to an embodiment of the present invention, and FIG. 1B is a side view of the same.

FIG. 2 is a front view of a sound reproduction wall surface according to an embodiment of the present invention.

FIG. 3 is a perspective view of another embodiment of the present invention.

[Fig. 4] Similarly, velocity distribution map of standing waves in a room

FIG. 5 is a perspective view showing the same effect.

FIG. 6A is a front view showing the structure of a conventional acoustic wall member, and FIG. 6B is a side view of the same.

FIG. 7 is a perspective view of an acoustic wall surface using the same acoustic wall member.

[Explanation of symbols]

 1 Cabinet 2 Reflector 3 Reflective Cabinet 4 Sound Absorbing Cabinet 5 Sound Absorbing Material 6 Acoustic Reflective Cabinet 7 Walls that constitute acoustic reproduction space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneo Tanaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A sound absorbing section for absorbing sound is provided at a portion in contact with at least two sides of an outer peripheral portion of a cabinet front of a substantially rectangular parallelepiped whose vertical and horizontal dimensions are each an integral multiple of a reference dimension. The average of all projection planes of the baffle is 10 to 10.
A wall member for acoustics, which is arranged so as to be 40%, and is provided with a polyhedral reflector protruding from the surface of the front baffle portion other than the sound absorbing portion. 2. A sound absorbing portion for absorbing sound is provided at a portion in contact with at least two sides of an outer peripheral portion of a rectangular or square panel front surface, in which vertical and horizontal dimensions of the front baffle are each an integral multiple of a reference dimension. Is 10 on average for all projection planes of the baffle
A wall member for acoustics, which is arranged so as to be 40%, and in which the polyhedral reflector protruding from the surface is provided on the front baffle portion other than the sound absorbing portion. 3. A sound absorbing portion for absorbing sound is arranged on a substantially center line of an inner wall of a reproduction space, and in other portions of the inner wall, the vertical and horizontal dimensions of the front baffle are each an integral multiple of a reference dimension. A sound absorbing portion that absorbs sound is arranged in a portion of the front surface of the cabinet or the square or rectangular panel which is in contact with at least two sides of the outer peripheral portion, and the front surface baffle portion other than the sound absorbing portion has a polyhedron protruding from the surface. An acoustic wall surface formed by arranging a plurality of acoustic wall members each having a reflector so that the average sound absorption coefficient is 10 to 40%.