JPH0836392A - Device and method for sound insulation of wall body - Google Patents

Abstract

PURPOSE:To provide a sound insulation device of a wall body having a good sound insulation performance and a sound insulation method. CONSTITUTION:The device consists of a microphone 5 which detects sound pressure from a sound generating source 4, vibration sensors 3 (3a to 3c) which receive the signals from the microphone 5, detect the vibration of a wall body 1 caused by the sound waves of the source 4 and installed on the body 1 and a control computing device 6 which outputs computed signals so as to cancel the vibration of the detection position on vibration adding elements 2 (2a to 2c) installed on the body 1. The elements 2 and the sensors 3 are placed on a same position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation device and a sound insulation method for windows or walls of buildings and factories.

[0002]

2. Description of the Related Art In the propagation of sound through a wall such as a window glass, a sound wave from a sound source vibrates the wall. The vibration of the wall body again generates a sound wave, and the sound wave is propagated. As a general means for suppressing this propagation, there is a double structure having an air layer in the middle of the wall. However,
In the case of the double structure, the high frequency component of the noise is easily absorbed by the wall body, but the low frequency component is hardly absorbed and the sound insulation effect is not sufficiently exerted in many cases.

Therefore, a sound insulation device for forcibly vibrating the wall has been proposed as a means for enhancing the sound insulation effect. This is to attach a vibration sensor to the window, detect the vibration of the window due to the sound (primary sound) from the sound source, and send a secondary sound that cancels this vibration toward the primary sound source from the speaker. The same as above, or a vibration sensor is attached to the window (panel) to detect the vibration of the window due to external noise,
A bending moment that cancels this vibration is applied by a vibrating element attached to the window.

[0004]

In a conventional sound insulation panel as shown in FIG. 2, the controlled vibration element 2 vibrates the wall 1 to reduce the vibration level at the point where the vibration sensor 3 is installed. It works as if to do. However, since the arrangement of the vibration element 2 does not match the position of the vibration sensor 3,
As shown in, the vibration of the vibration sensor 1 is reduced, but the point at which the vibration element 2 is arranged actually vibrates the wall 1. At the position where the vibration element 2 is arranged, the wall body 1 itself newly vibrates. It cannot generate the sound as a source and satisfy the purpose of the sound insulation wall.

[0005]

According to the sound insulation device for a wall of the present invention, a vibrating element mounted on the wall and a vibration sensor are installed at the same position, and a signal obtained from a microphone is transmitted to a control arithmetic unit by the control arithmetic unit. Calculate to suppress the vibration of the installation position,
It is characterized in that the signal obtained by this calculation is given to the vibrating element.

Further, the sound insulation method for the wall of the present invention detects the sound pressure of the sound from the sound source with the microphone, and
Vibration of the wall body generated by the sound wave from the sound source is detected by a vibration sensor attached to the wall body, and is calculated by a control arithmetic unit so as to cancel the vibration of the wall body based on a signal from the microphone. The calculated signal is output to a vibration element installed at the same position as the vibration sensor.

[0007]

In the vibration element and the vibration sensor arranged at the same position, the signal obtained from the microphone is calculated so as to suppress the vibration at this position, and the vibration of the wall body obtained by this calculation is canceled. Such a signal is applied to the vibrating element. As a result, the vibration of the position to be controlled is suppressed, the controlled vibration element works to suppress the vibration of its own position where it is arranged, and a new vibration primary sound source is not generated by the vibration element, and the wall body It suppresses the vibration of the and becomes a high performance sound insulation wall.

[0008]

EXAMPLE An example of the present invention will be described with reference to FIG.
In FIG. 1, reference numeral 1 denotes a wall body such as a glass window, a floor material, a ceiling plate or a partition board, and a vibrating element 2 and a vibration sensor 3 are attached to the surface of the wall body 1. The center positions of the attached vibration element 2 and vibration sensor 3 are arranged so as to coincide with each other.

A microphone 5 is arranged in front of the wall 1, that is, in front of the side facing the sound source 4. The sound pressure detected by the microphone 5 is converted into an electric signal and input to the control arithmetic unit 6.

In this control arithmetic unit 6, the microphone 5
The vibration value of the wall body 1 generated when the sound pressure from the sound generation source 4 reaches the wall body 1 is calculated based on the signal from the A signal is output so that the wall body 1 is vibrated so that the vibrations are canceled. The magnitude of vibration is detected by the vibration sensor 3, and the detected signal is input to the control arithmetic unit 6. And
In order to reduce the magnitude of this vibration, the control arithmetic unit 6 calculates and outputs a correction signal to the vibrating element 2. By controlling in this way, the vibration of the wall body 1 is sequentially reduced.

Although the embodiment of FIG. 1 shows the case where three vibrating elements 2a to 2c and three vibrating sensors 3a to 3c are used, the number of these may be set to any number as required. Can be increased or decreased.

Further, the vibrating element 2 and the vibration sensor 3 attached to the wall 1 may be arranged on any surface of the wall 1 as long as the central positions of the two are the same. That is,
As shown in FIG. 1, the vibrating element 2 and the vibration sensor 3 may be arranged on one surface of the wall body 1 so that the center positions of the both are aligned with each other. The same control effect can be obtained in a configuration in which the vibration sensor 3 is arranged on the other surface while the vibration sensor 3 is arranged.

[0013]

As described above, according to the sound insulation device and the sound insulation method for a wall of the present invention, the sound directed toward the wall is detected by the microphone arranged between the sound source and the wall. Further, the vibration of the wall body generated by the sound wave from the sound source is detected by a vibration sensor attached to the wall body, and a control arithmetic unit receives a signal from the microphone to cancel the vibration of the wall body. Since the calculation is performed and the calculated signal is given to the vibration element installed at the same position as the vibration sensor, the controlled vibration element does not become a new primary sound source, and high sound insulation performance is obtained. There is an effect that the sound insulation device of the wall body is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional example.

FIG. 3 is a wall vibration characteristic diagram of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wall body, 2 ... Exciting element, 3 ... Vibration sensor, 4 ... Sound source, 5 ... Microphone, 6 ... Control arithmetic unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location G10K 11/16 (72) Inventor Takashi Yokota 3-5-11 Doshomachi, Chuo-ku, Osaka-shi, Osaka Inside Nippon Sheet Glass Co., Ltd. (72) Inventor Naoki Morimoto 3-5-11 Doshumachi, Chuo-ku, Osaka City, Osaka Prefecture Inside Nippon Sheet Glass Co., Ltd. (72) Instructor Kozo Mizoguchi 3-5 Doshomachi, Chuo-ku, Osaka City, Osaka Prefecture No. 11 within Nippon Sheet Glass Co., Ltd.

Claims (4)

[Claims] 1. A microphone for detecting a sound pressure of a sound from a sound source, a vibration sensor attached to a wall body for detecting a vibration of a wall body generated by a sound wave from the sound source, and the microphone. Receiving a signal of the above, and outputting a signal calculated so as to cancel the vibration at the detection position to the vibration element attached to the wall body, the sound insulation device for the wall body, comprising: A sound insulation device for a wall, wherein an element and the vibration sensor are installed at the same position. 2. The sound insulation device for a wall body according to claim 1, wherein the vibrating element and the vibration sensor are attached to one surface of the wall body such that their center positions coincide with each other. 3. The vibrating element is attached to one surface of a wall body, and the vibration sensor is attached to the other surface of the wall body with its center position aligned with the center position of the vibrating element. The sound insulation device for a wall according to claim 1. 4. The microphone detects the sound pressure of the sound from the sound source and the vibration sensor attached to the wall to detect the vibration of the wall body generated by the sound wave from the sound source. Based on the signal from the control calculation device to calculate to cancel the vibration of the wall,
A sound insulation method for a wall body, wherein the calculated signal is output to a vibration element installed at the same position as the vibration sensor.