JPH056500U - Sound distributor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The purpose of the present device is to provide an acoustic distribution device having a simple structure without providing electrical wiring. The acoustic distribution device of the present invention is a reflection wall member 1 made of a material having a high acoustic impedance with respect to space.
And has a configuration in which a speaker 6 as an acoustic source is arranged at an end of an acoustic waveguide 4 provided with an acoustic radiation slit 3 penetrating from the inside to an external space at a predetermined location.
Moreover, if the length and diameter of the acoustic waveguide 4 to the other end are adjusted, the position of the peak value of this interference wave may or may not move, and the sound leaking from the acoustic radiation slit 3 to the outside also moves. Do or do not move.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a sound distribution device, and in particular, a sound generated from one sound source can be distributed to a plurality of places. The present invention relates to a structure of an acoustic distribution device that can be emitted as a light.

[0002]

[Prior art]

  Conventionally, for example, when trying to distribute the speech of one person over a wide range, , The speakers that have been electrically wired in advance are distributed and arranged in a wide range. After amplifying the speech with an audio amplifier, distribute the amplified audio signal to each speaker. The sound emitted from one sound source can be emitted at multiple locations.

[0003]

[Problems to be solved by the device]

  Devices such as these must have electrical wiring for each speaker. Also, the speaker is a cone type diaphragm made of paper or a coil attached to this diaphragm. It has parts such as a speaker, and it is necessary to prevent There is a problem that installation costs a lot of equipment, such as having to make a water structure. is there.

[0004]   The present invention remedies the above-mentioned conventional drawbacks, and its purpose is electrical It aims to provide an acoustic distribution device with a simple structure without wiring. is there.

[0005]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object of the present invention, the present invention is formed in a cylindrical shape and has a space on its inner surface. And having a reflective wall member made of a material having a high acoustic impedance, An acoustic waveguide provided with an acoustic radiation slit penetrating from the inner surface to the outer surface at a predetermined location. There is provided an acoustic distribution device characterized in that an acoustic source is arranged at the end of the.

[0006]

[Action]

  When a sound source such as a speaker is attached to one of the acoustic waveguides and a sound is generated from this, the sound is generated. Sound propagates in the sound wave guide, and this sound leaks out from the slit. And the sound Adjusting the length to the other end of the waveguide, diameter, etc., the position of the peak value of this interference wave Moved or did not move, and the sound leaking from the slit moved to the outside Do not move.

[0007]

【Example】

  Next, an embodiment of the present invention will be described in detail with reference to the drawings.   FIG. 1 is a vertical sectional view of an audio distribution device according to the present invention. In FIG. 1, 1 is inside A hollow wall-shaped cylindrical reflecting wall member made of hard vinyl chloride. The inner surface of the reflective wall member 1 has a high acoustic impedance with respect to space, The sound propagating in the internal space of the surface member is well reflected.

[0008]   A cylindrical sound insulation member 2 made of styrofoam is provided around the outer periphery of the reflection wall member 1. It is provided in close contact with the wall surface member 1. As clearly shown in FIG. Sound radiation that penetrates from the inside to the outside space is provided at predetermined locations on the wall surface member 1 and the sound insulation member 2. The shooting slits 3, 3, ... Are opened. And the reflection wall member 1 and the sound insulation member The acoustic waveguide 4 is composed of 2 and.

[0009]   One end of the acoustic waveguide 4 is shielded by a lid 5 made of hard vinyl chloride. It A speaker 6 serving as an acoustic source is attached to the other end of the acoustic waveguide 4. ing. The speaker 6 is a closed box so that sound does not leak to the rear of the speaker 6. It is good to store in 7. In addition, 8 is a low frequency amplifier, 9 is cassette tape reproduction A device, 10 is a flange for holding the acoustic waveguide 4 and fixing it to the floor surface or the like. Is.

[0010]   FIG. 3 shows an embodiment in which the present invention is arranged in a small area such as a room, and 20 is a floor. It is a waterfall channel that is formed in steps, and a water source 21 is arranged upstream thereof. Waterway 20 On one side of the, there is a human passage 22 with a slope similar to the waterway 20. It Inside the side wall 23 provided between the waterway 20 of the waterfall and the human passage 22 The waveguide 4 is embedded. Further, the slit 3 provided in the acoustic waveguide 4 is provided on the side wall 2 Penetrates into the upper surface of. At the upstream side of the waterfall and at the end of the acoustic waveguide 4, a closed box The speaker housed in 7 is attached.

[0011]   The operation of the embodiment shown in FIG. 3 will be described. Water along the waterway 20 from upstream of the waterfall And the sound of water murmuring from the speaker housed in the closed box 7. A sound is passed through the acoustic waveguide 4. Materials with high acoustic impedance to space The reflective wall member 4 made of a material transmits sound well. And the sound is the sound from the speaker While propagating in the downstream direction while reflecting in the waveguide 4, some of the sound is Reflected in the direction of the speaker from one end, and acoustic waves in the traveling direction interfere with reflected acoustic waves. If the length and diameter of the acoustic waveguide 4 to the other end are adjusted, the wave of this interference wave The position of the high price moves from the upstream direction to the downstream direction of the waterfall.

[0012]   In this way, the interference wave propagating inside the acoustic waveguide 4 leaks from the slit 3 to the outside. Then, a person walking on the human passage 22 from the upstream direction to the downstream direction of the waterfall. And the sound of babbling water moves from upstream to downstream. Sounds like you are. Therefore, the amount of water flowing through the waterfall is small and the sound is almost murmuring. Even if the sound is not emitted, the sound leaking from the slit 3 is warm for people walking along the waterfall. Sounds like the strange murmuring caused by the stream of water.

[0013]   In the above embodiment, the sound insulating member 2 surrounds the outer circumference of the acoustic waveguide 4, but Depending on the method, the sound insulation member 2 is not necessary. Also, the reflective wall member 1 is made of iron or the like. The metal may be used, or the cross-sectional shape is not limited to a circle, and may be a polygon such as a quadrangle. further If the length and diameter of the acoustic waveguide 4 to the other end are adjusted, the peak value of this interference wave The sound does not move and the sound leaks evenly from each slit 3. This In the case of such a configuration, the slit 3 behaves as if it were a small speaker.

[0014]

[Effect of device]

  As described in detail above, the present invention provides high acoustic impedance with respect to space. It is composed of a reflective wall member using a material that has A structure in which an acoustic source is arranged at the end of an acoustic waveguide having an acoustic radiation slit penetrating therethrough. If you adjust the length and diameter to the other end of the acoustic waveguide, The position of the peak value of this interference wave may or may not move, so Compared to the PEEKER system, it is extremely versatile and does not require wiring of electric wires. Since it does not use a speaker that uses electronic parts, it can be used as an outdoor sound distribution device. Will be optimal.

[Brief description of 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 an explanatory view of a usage example of the sound distribution device.

[Explanation of symbols]

1 ... Reflective wall member 2 ... Sound insulation member 3 ... Slit 4 ... Acoustic waveguide 5 ... Lid 6 ... Speaker

Claims (2)

[Scope of utility model registration request] 1. An acoustic waveguide at an end portion of an acoustic waveguide, which comprises a reflecting wall member made of a material having a high acoustic impedance with respect to a space, and provided with an acoustic radiation slit penetrating from an inside to an outside space at a predetermined position. An acoustic distribution device characterized by arranging a source. 2. An outer peripheral surface of the acoustic waveguide excluding an acoustic radiation slit is surrounded by a sound absorbing material having a lower acoustic impedance than a reflection wall member.
The acoustic distribution device described.