JPH04218099A - Sound insulating device - Google Patents

Abstract

PURPOSE:To insulate the sounds of machines and houses without using many materials by providing a controller which applies signals to a sound generator in accordance with the information from a detector. CONSTITUTION:The sound pressure of a space 1 or the sound of a space 2 on the side to be transmitted is measured by a sound pressure measuring instrument 4 and the resulted sound pressure is transmitted to a controller 6. A sound radiator 5, such as speaker, is driven by the signal from the controller 6 to radiate sounds. The space 3 is formed as the space of the small sound pressure by interfering the sound pressure from the space 1 or the space 2 and the sound pressure radiated from the radiator 5. The space 3 is silenced in such a manner, by which the sounds between the spaces 1 and 2 are insulated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a noise device that prevents sound from propagating from the inside to the outside or from the outside to the inside in mechanical equipment, housing structures, and housing equipment. .

[Conventional technology]

Regarding acoustics and sound, it has been studied in various fields than before.
Sound has been achieved by tightening or covering with board-shaped materials such as shielding boards, covers, sound-absorbing walls, double walls, and double-glazed windows.

Therefore, conventional ideas are limited to methods of construction of the material and structure of the diaphragm. In general, according to the law of mass, the sound effect caused by a diaphragm can only be achieved by using a diaphragm with a high density, and if there is bending vibration of the diaphragm, there is a chance of coincidence. A phenomenon of total transmission called the effect may appear.

[Problem to be solved by the invention]

The above-mentioned prior art is entirely determined by the characteristics of the diaphragm that reduces sound transmission. In this case, the specific gravity and thickness of the board were issues, and the board had to be quite heavy and thick to be effective, and the board needed to have great rigidity. this is,
In particular, it is designed to increase the transmission of sound in the low frequency range.

The purpose of the present invention is to use active control to change the noise characteristics to those that do not depend on the frequency range or material, and to provide a simple sound effect that is especially effective in the low frequency range. There is a particular thing.

[Means to solve the problem]

In order to achieve the above object, the sound barrier plate is made at least double, and at least one sound detection means and at least one sound generation means are provided in the space surrounded by the sound barrier board. A controller is provided as a means for controlling the generation of sound.

[Effect]

The sound detection means measures the sound transmitted from the diaphragm. A sound having an opposite phase to this sound is generated from the sound generating means via the controller. Because these sounds interfere with each other, the sound pressure in the space between the plates decreases, creating a shimmering sound effect.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of the shiya sound effect of the present invention. Spaces 1 and 2 are separated by a pair of partition members 108. The space between the partition members 108 is called an active silencing space 3. Further, the member 107 is an enclosing member for making the active silencing space 3 a closed space. The space 3 has a sound radiator 5 and a detection means 4. The sound generating means and the detecting means are connected by a controller.

Sound is transmitted from one of Space 1 or Space 2 to the other. In order to mute or reduce the sound pressure in the space 3, the sound pressure in the space or the sound in the space to which it is transmitted is measured by a sound pressure measuring device 4 such as a microphone. this is,
It may be the amount of vibration of the diaphragm plate on the side to be transmitted, for example, acceleration.

The obtained sound pressure or vibration amount is transmitted to the controller 6, and in order to reduce the sound pressure in the space 3, an acoustic radiator 5 such as a speaker is driven by a signal from the controller to emit sound. The sound pressure transmitted from the space 1 or 2 and the sound pressure radiated from the radiator 5 are made to interfere with each other to make the space 3 a space with low sound pressure.

By muffling space 3 in this way, the sound between spaces 1 and 2 is created. The present invention is a chimney sound device having a control system that actively mutes sound pressure by interference in this way.

FIG. 2 is an example of the double-glazed siyatone window of FIG. 1. Here, an active silencing space 3 is constituted by two window glasses 8 and a window frame 7. The window frame 7 is fitted into the wall 109. Sound pressure sensor 4 is installed in space 3.
There is a sound radiator 5.

The controller 6 has a phase adjustment and a gain adjustment function in order to mute the sound pressure in the space by causing the actuator to emit sound with an opposite phase. According to the embodiment, the sound pressure transmitted through the active silencing space 3 becomes very small, and no effective sound effect can be obtained. Double glazing with such sound effects is widely used in trains, general housing, etc.

FIG. 3 shows an example in which the present invention is applied to a door in a room similar to the window in FIG. 2, and 9 is a door frame.

With the present invention, sounds passing through each room are muffled.

FIG. 4 shows an example in which the method is applied to a panel on the wall of a room, similar to the window shown in FIG. 10 is a wall panel board. Similar to walls, ceiling and floor panels can also be used as sound devices.

FIG. 5 shows an example in which the same principle is applied to the outer panel or cover surrounding the machine 11. For example, consider the case where the machine 11 makes a noise.

A machine 11 is installed within the enclosure 12.

Moreover, a sound pressure sensor 4 and a sound radiator 5 are present therein. That is, the inside of the enclosing member 12 serves as an active silencing space 3. Therefore, almost no sound from the machine 11 comes out.

FIG. 6 shows an example in which the present invention is applied to a part of the outer panel or cover 113 surrounding the machine 13.

Here, the inner space constituted by the cover 113 and the enclosing member 16 becomes the active silencing space 3.

FIGS. 7 and 8 show specific examples in which a compressor and a motor are surrounded by the noise device of the present invention.

FIG. 9 shows an embodiment that further enhances the effects of the present invention. Two silencing spaces 3 are provided here. For this reason, an even greater silencing effect than the silencing effect shown in FIG. 2 can be obtained. Note that there is no problem even if two or more spaces 3 are provided.

〔Effect of the invention〕

According to the present invention, it is possible to actively muffle the space inside the sound body to prevent sound from being transmitted, so that the noise of machinery and houses can be reduced by using many materials that are generally required for noise. It can be realized without using

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIGS. 2 and 3 are sectional views of an embodiment of the present invention, and FIGS. 5, 6, and 7
The figure is a front view of the present invention, FIG. 8 is a perspective view of the present invention, and FIG. 9 is a sectional view of one embodiment of the present invention. 1, 2... Space where sound is generated, 3... Space where sound is silenced, 4...
Sound pressure sensor, 5... Sound radiator, 6... Controller, 7...
Window frame, 8...Window glass, 9...Door frame, 10...Wall panel board, 1
1...Equipment that radiates sound or has no problem with sound entering, 1
2...Enclosing member, 13...Equipment that emits sound or does not allow sound to enter, 14...Enclosing member, 15...Noise generating machine,
16...Sound device, 17...Noise generating machine, 19...Sound device. Agent Patent Attorney Katsuo Ogawa

Claims (1)

[Claims] Claim 1: In a closed space surrounded by a plurality of members,
What is claimed is: 1. A shimmering sound device, comprising: a sound generating device and a sound detecting device; and a control device configured to give a signal to the sound generating device based on information from the detecting device.