JP2580035Y2 - Sound distribution device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sound distribution device.
In particular, the present invention relates to a structure of a sound distribution device that can emit sound emitted from one sound source at a plurality of locations.

[0002]

2. Description of the Related Art Conventionally, for example, when one person's speech is to be distributed over a wide range, speakers which have been electrically wired are distributed and arranged over a wide range, and the speech is amplified by an audio amplifier. The amplified audio signal is distributed to each speaker so that sound emitted from one sound source can be emitted at a plurality of locations.

[0003]

[Problems to be solved by the invention]
Electrical wiring must be provided for each speaker, and the speaker has components such as a cone-shaped diaphragm made of paper and a coil attached to this diaphragm,
In the case where the speaker is placed outdoors, there is a problem that a large facility cost is required for installation, for example, a waterproof structure must be provided for each speaker.

[0004] The present invention is to improve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an acoustic distribution device having a simple structure without providing electrical wiring or the like.

[0005]

In order to achieve the object of the invention, the invention according to claim 1 is made of a material having a high acoustic impedance with respect to a space, and a predetermined portion is provided from the inside to the outside space. An acoustic source is arranged at an end of a reflective wall member having a cylindrical cross section provided with a plurality of slits for acoustic radiation penetrating therethrough, and the outer peripheral surface of the reflective wall member excluding the slit for acoustic radiation is surrounded by a sound insulating member. The sound distribution device according to claim 1, wherein a cross-sectional shape of the reflection wall member is a polygon. provide.

[0006]

A sound source such as a speaker is attached to one of the cylindrical reflecting wall members, and when sound is generated from this, the sound propagates in the reflecting wall member, and this sound leaks outside through a slit for sound radiation. When the length and diameter of the reflecting wall member are adjusted to the other end, the traveling sound wave, the sound wave reflected on the wall surface, and the reflected sound wave from the other end interfere in a complicated manner, and the position of the peak value of the interference wave moves. The sound that leaks to the outside through the slit for sound emission also moves or does not move.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of the sound distribution device according to the present invention. In FIG. 1, reference numeral 1 denotes a cylindrical reflecting wall member having a hollow interior, which is made of hard vinyl chloride. The inner surface of the reflective wall member 1 has a high acoustic impedance with respect to the space, and reflects the sound propagating through the internal space of the reflective wall member well.

On the outer periphery of the reflecting wall member 1, a cylindrical sound insulating member 2 made of styrene foam is provided in close contact with the reflecting wall member 1. As clearly shown in FIG. 2, slits 3, 3, 3, 3 for acoustic radiation penetrating from the inside to the external space are provided at predetermined positions of the reflecting wall member 1 and the sound insulating member 2.
... is open. Then, the acoustic waveguide 4 is constituted by the reflection wall member 1 and the sound insulation member 2.

One end of the acoustic waveguide 4 is shielded by a lid 5 made of hard vinyl chloride. A speaker 6 serving as an acoustic source is attached to the other end of the acoustic waveguide 4. The speaker 6 is preferably housed in a closed box 7 so that sound does not leak to the rear of the speaker 6. Reference numeral 8 denotes a low-frequency amplifier, 9 denotes a cassette tape reproducing device, and 10 denotes a flange for holding the acoustic waveguide 4 and fixing it to a floor or the like.

FIG. 3 shows an embodiment in which the present invention is arranged in a small area such as a room. Reference numeral 20 denotes a waterway of a waterfall formed in a step shape, and a water source 21 is arranged upstream of the waterway. On one side of the waterway 20, a human passage 22 having the same inclination as the waterway 20 is provided. The acoustic waveguide 4 is embedded in a side wall 23 provided between the waterfall waterway 20 and the human passage 22. A slit 3 for acoustic radiation provided in the acoustic waveguide 4 penetrates the upper surface of the side wall 2. A speaker (not shown) housed in a closed box 7 is mounted on the upstream side of the waterfall and at the end of the acoustic waveguide 4.

The operation of the embodiment shown in FIG. 3 will be described. Water flows along the water channel 20 from the upstream of the waterfall, and the sound of the babbling of water flows from the speaker housed in the closed box 7 into the acoustic waveguide 4. The reflecting wall member 1 made of a material having a high acoustic impedance with respect to the space transmits sound well inside the cylindrical shape. In addition, since the outer peripheral surface of the reflecting wall member 1 is surrounded by the sound insulating member 2, a small amount of sound leaks in the space direction from the outer wall surface thereof, and eventually the sound propagation in the cylindrical shape of the reflecting wall member 1 is efficient. . And
The sound propagates from the speaker in the downstream direction while reflecting inside the reflecting wall member 1, but a part of the sound is reflected from the lid 5 direction of the reflecting wall member 1 toward the speaker, and the acoustic wave reflected in the traveling direction and the reflected acoustic wave. When the length, the diameter, and the like of the reflecting wall member 1 are adjusted, the position of the peak value of the interfering acoustic wave moves from the upstream direction to the downstream direction of the waterfall.

Thus, the reflecting wall member 1 and the sound insulating member 2
The interference wave propagating inside the acoustic waveguide 4 constituted by
.. Leaks from the slits 3, 3,... For sound emission to the outside, and can be heard by a person walking in the human passage 22 from the upstream direction to the downstream direction of the waterfall. It sounds like it is moving downstream from. Therefore, even if there is little water flowing through the waterfall and almost no babbling sounds are emitted, the sound leaking from the slit 3 for sound emission sounds strange to a person walking along the waterfall as if by a water flow.

In the above embodiment, the reflecting wall member 1 is made of a synthetic resin such as vinyl chloride. However, it can be made of a metal such as iron. The cross-sectional shape of the reflecting wall member 1 is not limited to a circle, but may be a polygon such as a quadrangle. Further, when the length, diameter, and the like of the acoustic waveguide 4 are adjusted, the sound leaks uniformly from the slits 3 for each acoustic radiation without moving the position of the peak value of the interference wave. In such a configuration, the slit 3 for acoustic radiation behaves like a small speaker.

[0014]

[Effect of the Invention] As described in detail above, the present invention
It is made of a material having high acoustic impedance with respect to the space, and a plurality of slits for acoustic emission are provided at predetermined locations from the inside to the outside space. A light source is arranged, and has a configuration in which the outer peripheral surface of the reflective wall member excluding the slit for acoustic emission is surrounded by a sound insulating member, and when the length, diameter, etc. of the reflective wall member are adjusted, Since the position of the peak value of the interfering wave generated in the medium moves or does not move, the use of the speaker is extremely widespread and requires one electric wire compared to the conventional sound distribution device. Therefore, the wiring structure can be simplified, and it is optimal for an outdoor sound distribution device.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an acoustic distribution device.

FIG. 2 is a cross-sectional view of the sound distribution device.

FIG. 3 is a diagram illustrating an example of use of an acoustic distribution device.

[Explanation of symbols]

 1 ... reflection wall member 2 ... sound insulation member 3 ... slit for acoustic radiation 4 ... acoustic waveguide 5 ... cover 6 ...・ Speaker

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G10K 11/22 G10K 11/02

Claims (2)

(57) [Scope of request for utility model registration] 1. An end portion of a reflective wall member having a cylindrical cross section and made of a material having a high acoustic impedance with respect to a space and having a plurality of slits for acoustic radiation penetrating from a predetermined position to an external space. A sound source, and an outer peripheral surface of the reflecting wall member excluding a slit for sound emission is surrounded by a sound insulating member. 2. The sound distribution device according to claim 1, wherein a cross-sectional shape of the reflection wall member is a polygon.