JPH06149267A - Sound insulating window - Google Patents

Abstract

PURPOSE:To provide the sound insulating window which easily reduce the vibration level of the whole window. CONSTITUTION:This sound insulating window has a microphone 2 which detects the transmitted sound pressure of the window 1, a speaker 3 which is present at the window peripheral edge part and radiates a sound wave into a sound receiving room space 7, a driving part 4 which drives this speaker 3, a sensor 5 which detects a noise from a noise source 6, and a driving part 4 which processes signals from the sensor 5 and microphone 2 to suppress the transmitted sound pressure to the sound receiving room space 7 due to the noise with the radiated sound from the speaker 3. Therefore, such a defect that vibration at points other than the vibration sensor increase to decrease the sound insulation of the whole window like before is eliminated. Further, the speaker 3 is used, so the transmission frequency characteristics of a control signal can easily be flattened. Further, the speaker 3 is fitted to the window peripheral edge part, so the light transmissivity (light collecting performance) of the window is not spoiled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation window for preventing noise, and is used, for example, to improve sound insulation of a musical instrument playing room or an audio room.

[0002]

2. Description of the Related Art In recent years, noise prevention has become an important issue in the environment of living environments due to the increasing density and aggregation of houses in urban areas, and various sound insulation windows have been used along with it. Generally, a double structure having an air layer in the middle is used because it is lightweight and has relatively good sound insulation. However, it is difficult to say that this product has sufficient sound insulation performance in the middle and low frequency regions because of the resonance transmission phenomenon in the low frequency region due to the spring action of the middle air layer.

Therefore, a sound insulation window having an active sound insulation effect has been proposed. This is, as shown in FIG. 3, a window 1, a vibration sensor 9 attached to the window 1 for detecting vibration of the window 1, an actuator 10 for excitation attached to the window 1, and a drive for driving the actuator 10. The part 4 and the noise detection sensor 5 for detecting the sound or vibration emitted from the noise source 6, and the electric signal of the noise inputted from the vibration sensor 9 and the noise detection sensor 5,
The driving unit 4 performs a calculation to excite the window 1 in a phase opposite to that of the noise, thereby canceling the vibration of the window 1 due to the noise, and as a result, stopping the vibration of the window 1 and maintaining the stationary state.

[0004]

In the conventional sound-insulating window of this type, as the vibration sensor 9 for detecting the vibration of the window 1, a type for detecting the vibration acceleration is used, and the window 1 has its peripheral portion. The vibration sensor 9 is attached to the center of the window 1 where the vibration is considered to be the largest because the vibration sensor 8 is fixed. For this reason, the conventional sound insulation panel functions to reduce the vibration level at the point where the vibration sensor 9 is attached, and the vibration at the point on the window 1 other than the point where the vibration sensor 9 is installed. The level is not involved at all. Therefore, in some cases, by suppressing the vibration at the position where the vibration sensor 9 is installed, the vibration at points other than this position may conversely increase. That is, in the frequency region where the vibration mode is other than the primary resonance mode, many peaks and valleys are distributed on the plane of the two-dimensional panel, that is, vibration nodes and antinodes are formed, and as shown by the broken line in FIG.
Even if the vibration at the position of the vibration sensor 9 is controlled to be zero, the vibration may increase at other points.
Since the sound insulation of the panel is determined by the vibration state of the entire panel surface, the sound insulation may be deteriorated. Even if the number of points for suppressing the vibration level on the window 1 is increased by using a plurality of vibration sensors 9, a higher-order vibration mode (a mode with a large number of nodes and antinodes) is generated as the frequency becomes higher. Not a solution.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sound insulation window capable of easily reducing the vibration level of the entire window.

[0006]

In the sound insulation window of the present invention, in order to solve the above problems, as shown in FIG.
A window 1; a microphone 2 in the sound receiving room space 7 for detecting the sound pressure of the transmitted sound of the window 1; a speaker 3 in the window peripheral portion 8 for emitting sound waves into the sound receiving room space 7; From the driving unit 4 that drives the speaker 3, the sensor 5 that detects the sound or vibration emitted from the noise source 6, the sensor 5 for noise detection, and the microphone 2 that detects the sound pressure in the sound receiving room space 7. And a driving unit 4 which controls the driving force to the speaker 3 so as to suppress the sound pressure level of the sound transmitted into the sound receiving room space 7 due to the noise by the sound emitted from the speaker 3. It is characterized by.

[0007]

In FIG. 1, the sound transmission loss by the window plate 1 is determined by the mechanical impedance of the window plate 1.
The sound wave generated from the noise source 6 is incident on the surface of the window plate 1,
The window plate 1 is vibrated. Due to this vibration, sound waves are radiated into the sound receiving chamber space 7 on the opposite side of the noise source 6 to cause sound transmission. Here, with respect to the secondary sound wave from the speaker 3 in the vicinity of the window such that the sound pressure level at the point where the microphone 2 in the sound receiving room space 7 is installed, that is, the wavefront of the transmitted sound from the window plate 1, By radiating wavefronts with the same amplitude and opposite phase, and interfering with the transmitted sound of noise,
The sound waves cancel each other out, and the sound insulation of the window plate 1 increases.

[0008]

FIG. 2 shows the schematic construction of an embodiment of the present invention. The wall that separates the two spaces has a window in which the face plate 1 is fixed by the peripheral member 8, and a plurality of, and in the illustrated embodiment, eight control speakers 3 for controlling the sound receiving chamber of the peripheral member 8.
Is embedded and four microphones 2 are installed in the sound receiving room space 7. The drive unit 4 which gives a control signal to the speaker 3 has an arithmetic circuit using a DSP (digital signal processor). A noise detection sensor 5 for detecting a vibration or a sound generated by a noise source 6 is connected to the drive unit 4, and a sound pressure signal from the microphone 2 is input. The arithmetic circuit of the drive unit 4 is Mul
triple Error Filtered-X LM
It constitutes an adaptive digital filter that operates according to the S algorithm, outputs a signal that lowers the sound pressure level detected by the microphone 2, drives the control speaker 3 with this signal, and outputs the sound receiving room space 7 To reduce the noise transmitted to the.

[0009]

According to the present invention, since it works to reduce the sound pressure level at the point where the microphone for detecting the sound pressure in the sound receiving room is attached, it is possible to reduce the sound pressure level of the conventional sound insulation window. On the contrary, there is no disadvantage that the vibration of points other than the vibration sensor increases on the contrary, and the sound insulation of the entire window deteriorates. Further, when the actuator is mounted on the window face plate as in the conventional example, the control signal transmission frequency characteristic becomes uneven due to the influence of the natural vibration mode of the window face plate, and a controllable frequency and a controllable frequency appear. Whereas appropriate control is difficult to be performed by the present invention, in the present invention, by using the sound waves emitted from the speaker as a control force for suppressing the sound pressure level of the transmitted sound in the sound receiving room space, It becomes easy to flatten the transfer frequency characteristic of the control signal. Furthermore, when an actuator is used for control, the actuator installation portion cannot obtain the light transmittance required for the window, whereas in the present invention, the speaker is attached to the peripheral portion of the window to control the window. It also has the effect of not impairing the daylighting performance of.

[Brief description of drawings]

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

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a perspective view showing a schematic configuration of a conventional example.

FIG. 4 is an explanatory diagram of a vibration mode in a conventional example.

[Explanation of symbols]

 1 Window (face plate) 2 Microphone 3 Speaker 4 Drive part 5 Sensor 6 Noise source 7 Sound receiving room space 8 Edge part 9 Vibration sensor 10 Actuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Sueto 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (1)

[Claims] 1. A window, a microphone for detecting sound pressure of a transmitted sound of the window in the sound receiving room space, a speaker for radiating a sound wave in the sound receiving room space at a peripheral portion of the window, and the speaker. The drive unit, the sensor that detects the sound or vibration emitted from the noise source, the noise detection sensor, and the microphone that detects the sound pressure in the sound receiving room calculate the signals and receive the noise. A sound insulation window, comprising: a drive unit that controls a driving force to a speaker so that a sound pressure level of a transmitted sound into a sound room space is suppressed by a sound emitted from the speaker.