JPH05108083A - Electronic muffling device for local sound elimination - Google Patents

Abstract

PURPOSE:To provide the electronic muffling device for local muffling which can eliminate a noise propagated from a reception area without exerting any adverse influence upon other work areas except the periphery of a worker. CONSTITUTION:This electronic muffling device consists of a sensor microphone 16 which detects a noise generated in the reception area 12, a speaker 26 which radiates an additional sound for canceling the noise, an error microphone 30 which is fitted in the periphery 72 of the worker 32 in the work area and detects the interference sound between the noise and the additional sound from the speaker 26, and a controller 22 that generates a driving signal for radiating the additional sound which is opposite in phase from and has the same sound pressure with the noise from the speaker 26; and the speaker 26 is installed in an oscillatory state and given directivity, an infrared-ray generator 70 is mounted in the periphery 72 of the speaker 26, and a photodetection part which photodetects infrared rays from the infrared-ray generator 70 is fitted to the speaker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic silencer for local noise reduction, and in particular, in an office space where a noise area and a work area are formed on the same floor, noise propagated from the noise area is muffled in the work area. The present invention relates to an electronic silencer for local silence.

[0002]

2. Description of the Related Art In an office space in which a noise area and a work area are formed on the same floor, noise generated in the noise area is prevented from propagating to the work area.
There is a method of partitioning the noise area 2 and the work area 3 with a partition 1 as shown in FIG. However, this method has a drawback that the partition 3 itself has a small sound absorbing effect, and that the noise is propagated to the work area 2 by the diffracted sound 4 from the upper end of the partition 3. Further, there is a drawback that the office space cannot be effectively utilized by providing the partition 3.

On the other hand, as a muffling device for muffling the noise generated in the noise area 2, an additional sound having an opposite sound phase and the same sound pressure is radiated, and the muffling effect is forced by the sound wave interference between them. There is an electronic muffling device that causes it to occur automatically. With the rapid development of electronic devices, signal processing technology, and the like, research results from various viewpoints have recently been announced one after another in this type of electronic silencer.

Regarding the electronic silencer, the applicant of the present application has already disclosed a system configuration for practical use in the specification of Japanese Patent Application No. 61-7115. As an application of this system configuration to the present case, an electronic silencer for local silencer shown in FIG. 5 has been proposed. According to FIG. 5, a noise information detection unit (hereinafter referred to as a sensor microphone) 5 detects noise generated in a noise area 2 and an electromechanical conversion unit (hereinafter referred to as a speaker) 6 is added to cancel the noise. Means to convert electrical to mechanical (hereinafter referred to as error microphone) that emits sound
Noise is silenced at the position 7, that is, in the vicinity 8 of the worker in the work area 3.

The sensor microphone 5, the speaker 6 and the error microphone 7 are connected to a controller 9. The controller 9 is based on signals from the sensor microphone 5 and the error microphone 7 and has a phase opposite to that of the noise. A drive signal for causing the speaker 6 to emit an additional sound having the same sound pressure is created.

[0006]

However, the conventional electronic sound muffling apparatus for local muffling can muffle noise in the vicinity 8 of the worker in the work area 3, but other than the vicinity 8 of the worker. In the work area 3, the additional sound emitted from the speaker 6 raises the noise level to the contrary, which has a drawback that the work area is adversely affected.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electronic muffling apparatus for local muffling which can muffle noise without adversely affecting the work area.

[0008]

In order to achieve the above object, the present invention is provided in an office space in which a noise area and a work area are formed on the same floor surface, and the noise propagated from the noise area is transferred to the work area. An electronic muffler for local muffler that muffles noise by means of noise information detecting means for detecting the noise, electromechanical converting means for radiating an additional sound for canceling the noise, and is installed near the worker in the work area. An electromechanical conversion means for detecting an interference sound between noise and an additional sound radiated from the electromechanical conversion means, and a reverse signal for the noise based on signals from the noise information detection means and the electromechanical conversion means. Control means for generating a drive signal for causing the electromechanical conversion means to emit an additional sound having a phase and the same sound pressure;
In the electronic sound deadening device for local noise reduction, the electromechanical conversion means is provided with directivity, the electromechanical conversion means is swingably installed, and infrared rays are installed near the worker. And a light-receiving part attached to the electromechanical converting means for receiving the infrared light from the infrared generator, and the electromechanical converting means at a position where the infrared light from the infrared generator is vertically received by the light receiving part. A driving means for swinging and fixing is attached, and the additional sound from the electromechanical converting means is emitted toward the worker.

[0009]

According to the present invention, the mechanical-electrical converting means is provided with directivity so that the additional sound emitted from the mechanical-electrical converting means is not diffused into the work area, and the infrared ray from the infrared ray generator is vertically received. The mechanical-electrical conversion means is swung to the position where the light is received by the drive means and fixed at that position. As a result, the additional sound from the electromechanical conversion means is radiated only to the vicinity of the worker in the work area.
The noise propagated from the noise area can be silenced without adversely affecting the work area except the vicinity of the worker.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an electronic sound deadening device for local sound deadening according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a cross-sectional view of an office space 10 to which an electronic sound deadening device for local sound deadening according to the present invention is attached. In the office space 10, a reception area 12 is formed on the left side of the drawing, and a work area 14 is formed on the right side of the drawing, and noise generated in the reception area 12 is propagated to the work area 14 through the office space 10.

On the other hand, the sensor microphone 16 is connected to the reception area 12
It is mounted on the reception table 18 installed at. The sensor microphone 16 is connected to the controller 22 via a cable 20. The controller 22 is provided in a ceiling room of the office space 10, and a speaker 26 having directivity, which will be described later, is connected to the controller 22 via a cable 24.

An error microphone 30 is attached to the work desk 28 installed in the work area 14. The error microphone 30 is installed at approximately the same height as the ear of a worker 32 who works on the work desk 28, and is connected to a transmitting device 36 via a cable 34. As shown in FIG. 2, the transmitter 36 is a signal indicating the sound detected by the error microphone 30, that is, the noise and the speaker 26.
A signal indicating the interference sound with the additional sound emitted from the A / D circuit 38 is A / D converted, modulated by the modulation circuit 40, and wirelessly transmitted to the receiving device 44 by the transmitter 42. As shown in FIG. 1, the receiver 44 is installed near the controller 22, demodulates the information wirelessly transmitted from the transmitter 42 shown in FIG.
Output to.

Based on the signals from the sensor microphone 16 and the receiving device 44, the controller 22 creates a drive signal for causing the speaker 26 to emit an additional sound having an opposite phase to the noise and having the same sound pressure. . Further, as shown in FIG. 3, the speaker 26 has a ceiling surface 56 through an hinge member 54 having an upper arm 50 and an upper arm 52 at an upper portion thereof.
It is mounted so that it can be swung. A shaft 58 is fixed to the lower arm, and a gear 60 is fixed to an end of the shaft 58. The gear 60 includes a rotary gear 6 of a drive motor 62.
4 is meshed, the gear 60 moves along the rotary gear 64 by driving the drive motor 62 and reversing the rotary gear 64 forward and backward, so that the speaker 26 can be swung.

Further, an infrared light receiving portion 66 composed of an infrared light receiving element is attached to the speaker 26 at a substantially central position of the additional sound emitting surface 26a. The infrared light receiving portion 66 is connected to a drive control device (not shown) of the drive motor 62 via a cable 68. In addition, the infrared signal generator 70
Is placed on the work desk 28. Next, the operation of the electronic muffler for local muffling configured as described above will be described.

First, the speaker 26 is oscillated by a drive motor 66 whose drive is controlled by a drive control device to a position where the infrared light generated from the infrared signal generator 70 hits the light receiving surface of the infrared light receiving portion 66 vertically. Fixed in position. Then, the infrared signal generator 7 is output from the speaker 26.
The additional sound is emitted toward 0, that is, toward the worker 32. The additional sound radiated from the speaker 26 is generated by the speaker 2
Since 6 has directivity, it is not diffused in the entire work area 14 and is emitted only to the vicinity 72 of the worker 32 to which the error microphone 30 is attached.

Therefore, according to this embodiment, as compared with the conventional electronic noise eliminator for local noise reduction in which the additional sound from the speaker is diffused in the work area, the work noise is distributed to other work areas 14 except the vicinity 72 of the worker 32. The noise propagated from the reception area 12 can be silenced in the vicinity 72 of the worker 32 without adversely affecting. Further, in this embodiment, since the signal from the error microphone 30 is transmitted to the controller 22 by wireless transmission, even if the infrared signal generator 70, the error microphone 30 and the transmission device 36 are installed in different places, Noise can be silenced in the vicinity 72 of the worker 32 who works at the place.

In this embodiment, the oscillating mechanism of the speaker 26 has been described for one direction, but the present invention is not limited to this, and it is desirable to oscillate in multiple directions.

[0018]

As described above, according to the electronic muffling apparatus for local noise reduction according to the present invention, the additional sound radiated from the mechanical-electrical converting means by directing the mechanical-electrical converting means does not diffuse to the work area. In addition, the driving means swings the mechanical-electrical conversion means to a position where the infrared light from the infrared generator is received vertically by the driving means, and the mechanical-electrical conversion means is fixed at that position. Since the noise is radiated only to the vicinity of the worker in the work area, the noise propagated from the noise area can be silenced without adversely affecting other work areas except the vicinity of the worker.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an office space to which an electronic sound deadening device for local sound deadening according to the present invention is attached.

FIG. 2 is a configuration diagram for wireless transmission applied to an electronic silencer for local silence according to the present invention.

FIG. 3 is an explanatory diagram of a speaker applied to the electronic sound deadening device for local sound deadening according to the present invention.

FIG. 4 is a cross-sectional view of a conventional office space provided with a partition.

FIG. 5 is a sectional view of an office space to which a conventional electronic sound deadening device for local sound deadening is attached.

[Explanation of symbols]

 10 ... Office space 12 ... Reception area 14 ... Work area 16 ... Sensor microphone 22 ... Controller 26 ... Speaker 30 ... Error microphone 36 ... Transmission device 44 ... Reception device 66 ... Infrared receiver 70 ... Infrared signal generator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Takahashi 1-1-14 Kanda, Uchida, Chiyoda-ku, Tokyo

Claims (2)

[Claims] 1. An electronic muffler for local muffling, which is provided in an office space in which a noise area and a work area are formed on the same floor and muffles noise propagated from the noise area in the work area. Noise information detection means for detecting, electromechanical conversion means for radiating additional sound for canceling noise, and interference between noise and additional sound radiated from the electromechanical conversion means installed near the worker in the work area Based on the signals from the electromechanical conversion means for detecting sound, the noise information detection means and the electromechanical conversion means, the electromechanical conversion means emits an additional sound having a phase opposite to that of the noise and having the same sound pressure. And a control means for generating a drive signal for controlling the electro-mechanical conversion means, wherein the electro-mechanical conversion means has directivity and the electro-mechanical conversion means has a directivity. Infrared generator installed in the vicinity of the worker, a light-receiving unit attached to the electromechanical conversion means for receiving infrared rays from the infrared generator, and infrared rays from the infrared generator. Drive means for swinging and fixing the electromechanical conversion means at a position where the light receiving part receives light vertically, and the additional sound from the electromechanical conversion means is emitted toward the worker. An electronic muffler for local muffling. 2. The signal from the electromechanical conversion means is wirelessly transmitted to the control means.
Electronic silencer for local silence as described.