JPWO2018235254A1 - Voice capture structure with noise reduction function - Google Patents

Abstract

An object of the present invention is to provide a voice capturing structure having a noise removing function that can be easily produced at low cost. The sound capturing structure is provided with a main body having a through hole, one end of the through hole serves as a sound introducing portion, and the other end thereof serves as a sound receiving portion. For a sound introduced from a part, a noise attenuation part having a cross-sectional area such that the attenuation amount is a region including a sound of a reference frequency or less <a region exceeding the reference frequency is formed, and the reference is provided at the one end of the main body. It is configured so that a noise reflecting portion that reflects sound in a region exceeding the frequency is formed.

Description

  The present invention relates to a voice capturing structure having a noise removing function.

In a manufacturing plant or a construction site for various industrial products, noise at the work site may interfere with communication between workers, leading to a reduction in work efficiency and a work error.
Conventionally, in order to solve such a problem under noise, a device that can reduce noise and clearly hear only voice has been provided as a device used for conversation between workers. The general structure of this kind of equipment is to receive sound including noise and voice as an electric signal, and to filter out this high frequency noise by filtering the electric signal to extract only the voice and amplify it. It is to listen.

  Further, as a conventional device of this type, a device that removes noise by a mechanical structure instead of electrically is proposed (Patent Document 1).

  12 and 13 show such a device, which is proposed as an in-ear device having a selective frequency response function. As shown in these figures, the in-ear device 1 includes a main body 2 to be mounted on the ear canal of the wearer, and the main body 2 is provided with inductive conducting portions 3, 4, 5. The inductive conducting parts 3, 4, 5 are filled with filter materials 6, 7, 8 for attenuating specific frequencies. A knob 9 is rotatably provided on the main body 2, and a sound from the outside is selectively introduced into the induction conducting portions 3, 4, 5 by rotating the knob 9.

  This in-ear device 1 attenuates a specific frequency region by rotating the knob 9 when hearing a sound from the outside, and attenuates noise from a sound including noise and outputs only a sound frequency. This is so that only the voice can be heard clearly.

Japanese Patent Publication No. 2013-515515

In the above equipment, in which noise is electrically removed, an electric circuit, a power source such as a battery is required, the structure is complicated, the production is troublesome, and the equipment becomes expensive (5,000 yen or more). There is a problem. Therefore, it is not practical to use at the work site.
Further, the ear device described in Patent Document 1 does not have a simple structure because the noise is attenuated by the filter material, and it takes time to select the filter material and the cost can be sufficiently reduced. Not really.
Most workers use "earplugs" of 1,000 yen or less, which may make it impossible to hear vehicle sounds such as a forklift running behind. In addition, when the danger is approaching, the warnings from workers in the neighborhood, such as “dangerous”, can be kept alert, and accidents occur quite often.
Alternatively, some workers are already deaf or have a deafness, and when they use earplugs, the external sound is blocked even further, and the danger is extremely increased. .

The problem to be solved by the present invention is to solve the problems that the above-described conventional devices have, and does not require special energy, has a simple structure, is easy to produce, and is noise-removal that can be obtained at low cost. It is to provide a voice capturing structure having a function.
Although this voice capturing structure extremely reduces annoying treble, it does not make it inaudible at all, and does not reduce the non-obtrusive sound range centered on the human voice. Furthermore, since there is a through hole between the ear canal and the outside, there is no feeling of pressure on the inner ear when wearing it, and it also prevents stuffiness, so it can withstand long-term use compared to conventional earplugs. Is possible.

The present invention adopts the following means in order to solve the above problems.
That is, the present invention includes a main body having a through hole, wherein one end of the through hole serves as a sound introducing section and the other end serves as a sound receiving section, and the sound introducing section is provided in the through hole. For a sound introduced from a part, a noise attenuation part having a cross-sectional area such that the attenuation amount is a region including a sound having a frequency equal to or lower than a reference frequency <a region exceeding the reference frequency is formed, and the reference is provided at the one end of the main body. It is characterized in that a noise reflection portion is formed to reflect the sound in the region exceeding the frequency.

  In one aspect of the present invention, the main body is formed to extend in one direction to form a tubular shape, and a groove is formed on one end face of the main body so as to surround the opening of the through hole. The outer surface of the groove is an inclined surface that widens in the extension direction of the one end portion, and the groove serves as the noise reflection portion.

  In one aspect of the present invention, a small diameter portion formed on the one end side of the main body, and a large diameter portion having a larger diameter than the small diameter portion and continuing to the small diameter portion to the other end portion of the main body. And the small diameter portion constitutes the noise attenuating portion.

  In one aspect of the present invention, a plurality of circumferential grooves are formed on the outer peripheral surface of the main body near the one end so as to be adjacent to each other in the one direction.

  One aspect of the present invention is characterized in that a mounting portion of the ear to the external auditory meatus is formed at the other end of the main body, and is configured as an earplug that attenuates noise and listens to voice.

  In one aspect of the present invention, the mounting portion is a member made of an elastomer that is detachably attached to the main body.

    According to the present invention, it is possible to provide an inexpensive voice capturing structure which has a simple structure and is easy to manufacture.

FIG. 3 is a side view of the voice capturing structure according to the embodiment of the present invention. FIG. 2 is a view on arrow A in FIG. 1. FIG. 2 is an enlarged sectional view taken along the line BB of FIG. 1. FIG. 8 is a side view of a voice capturing structure according to another embodiment of the present invention. FIG. 8 is a side view of a voice capturing structure according to another embodiment of the present invention. 6 is a graph showing a noise removal effect of noise due to an electric saw of the voice capturing structure according to the embodiment of the present invention. It is a graph which shows the noise reduction volume about the electric saw and the chip of the audio | voice acquisition structure which concerns on embodiment of this invention. It is a noise waveform diagram which shows the noise removal effect by the electric saw of the audio | voice acquisition structure which concerns on embodiment of this invention. 6 is a graph showing a noise removal effect of noise due to a jet plane of the voice capturing structure according to the embodiment of the present invention. It is a graph which shows the noise reduction volume about the jet plane and road cutter of the audio | voice acquisition structure which concerns on embodiment of this invention. It is a noise waveform diagram which shows the noise removal effect by the jet of the audio | voice acquisition structure which concerns on embodiment of this invention. It is a perspective view of the in-ear device shown as a prior art. It is a front view of the apparatus which abbreviate | omitted some members of the in-ear device of FIG.

An embodiment of a voice capturing structure having a noise removing function according to the present invention will be described below with reference to the accompanying drawings.
The embodiment described here is a form in which the present invention is applied to an earplug, and particularly a form in which the present invention is applied to an earplug in which noise is removed so that sound can be clearly heard.

1 to 3 show a voice capturing structure (earplug) having a noise removing function according to an embodiment of the present invention.
As shown in FIGS. 1 to 3, a voice capturing structure 1 having a noise removing function includes a main body 2 and a mounting member (mounting portion) 3 mounted on the main body 2.

The main body 2 is formed of a synthetic resin into a cylindrical shape, extends in one direction, and has a length dimension of 15 mm to 35 mm.
The inside of the main body 1 is formed as a through hole 4 having a circular cross section, and from the one end portion (first end portion) 2A toward the other end portion (second end portion) 2B, the small diameter portion 4a and the large diameter portion 4a. 4b is provided.

The small diameter portion 4a has a diameter of 0.5 mm to 1.5 mm and a length of 3 mm to 6 mm, and the large diameter portion 4b has a diameter of 4 mm to 6 mm and a length of 18 mm to 24 mm.
The one end portion 2A side of the small-sized portion 4a is a sound introducing portion 5 whose diameter increases in the direction of the one end portion 2A.
The other end 2B side of the large diameter portion 4b constitutes a fitting portion of the mounting member 3 and a sound receiving portion.

The small-diameter portion 4a and the large-diameter portion 4b that form the through-hole 4 attenuate the noise among the sounds including the external noise introduced from the sound introducing portion 5 so that only the voice is clearly on the other end 2B side. It constitutes a noise attenuator to reach.
As a requirement for configuring the noise attenuating unit, for the sound introduced from the sound introducing unit 5, the attenuation amount is a region including a sound having a reference frequency (for example, 1,600 Hz) or less <reference frequency (for example, 1,600 Hz). It is necessary to set the cross-sectional area and the like so that the area exceeds the above range.
This noise damping function is provided mainly by appropriately selecting the cross-sectional area and length of the small diameter portion 4a.

Grooves 8 and 9 are formed on the end surface 7 of the main body 2 on the side of the one end 2A around the axis of the through hole 4. The sections of the grooves 8 and 9 which circulate in the circumferential direction are V-shaped in cross section, and the radially outer surfaces of the grooves 8 and 9 are inclined so as to expand in the extending direction of the one end 2A of the main body 2. The surfaces 8a and 9a are formed.
In this case, among the end faces 7, the end face 7a on which the sound introducing portion 5 is formed is located so as to be recessed inward of the main body 2 by 0.1 mm to 0.3 mm from the end face 7b at the outer peripheral portion of the end face 7. The depth dimensions of the grooves 8 and 9 are 0.8 mm to 11.2 mm and 0.3 mm to 0.7 mm, respectively, with reference to the end face 7b.
The end face 7 including the grooves 8 and 9 constitutes a noise reflecting portion that reflects sound exceeding the reference frequency (for example, 1,600 Hz).

  The mounting member 3 is a member to be mounted on the external auditory meatus of the human ear, is made of an elastomer, and has an elastically deformable mounting portion 3a formed in a bowl shape and fitted to the main body 2. And a wearing part 3b. The mounting member 3 is integrated with the main body 2 by fitting the fitting portion 3b into the large diameter portion 4b of the through hole 4, and is detachable from the main body 2.

A deep peripheral groove 12 is formed on the outer peripheral surface of the main body 2 toward the one end portion 2A, and a peripheral groove and a ridge are provided in the axial direction of the main body 2 on the side separated from the one end portion 2A from the peripheral groove 12. The concavo-convex portions 13 that are alternately formed are formed.
The circumferential groove 12 and the concave-convex portion 13 are for facilitating the holding of the main body 2.

The voice capturing structure 1 having the noise removing function configured as described above is effective when used in a place where noise level is high and a conversation between workers is disturbed, such as a construction site. That is, when the workers wear the voice capturing structure (earplugs) 1, noise is removed and only the voice can be clearly heard.
To mount the voice capturing structure 1, the peripheral groove 12 or the uneven portion 13 of the main body 2 is gripped with a finger, and the mounting member 3 is mounted on the ear canal of the ear.

When the worker attaches the voice capturing structure 1 to his / her ear, the voice and noise around the worker reach the voice capturing structure 1. In this case, of the external sounds, particularly noise strikes the end face (noise reflecting portion) 7 and is diffusely reflected, and the sound pressure is attenuated. Since noise has a relatively high frequency (for example, a frequency exceeding 1,600 Hz), it impinges on the wall surfaces of the narrow grooves 8 and 9 formed in the end face 7 and is diffusely reflected and attenuated.
In addition, the voice and a part of the noise enter the small diameter portion 4a from the sound introducing portion 5 of the voice capturing structure 1. Here, since the small diameter portion 4a is a narrow space, noise having a relatively high frequency (for example, a frequency exceeding 1,600 Hz) is attenuated. However, since the voice has a relatively low frequency (for example, a frequency of 1,600 Hz or less), it passes through the small diameter portion 4a and reaches the worker through the large diameter portion 4b.

In the action of the voice capturing structure 1 described above, external noise is attenuated in the entire through hole 4, but it is mainly the small-diameter portion 4a that exhibits the attenuating action.
Thus, of the external sounds, the noise is removed and the voice reaches the workers, so that the conversation between the workers can be made smooth, and the deterioration of the work efficiency due to the noise can be suppressed.
Since the voice capturing structure 1 is formed by integrally molding the main body 2 made of synthetic resin and fitting the mounting member 3 made of elastomer to the main body 2, the structure is simple and the production is easy. There is an advantage that it can be obtained at low cost.

  In addition, in this embodiment, the dimensions of the respective parts of the main body 2 are illustrated, but the dimensions of the respective parts are not limited to this example, and it is possible to obtain the action and effect of removing noise and clearly listening to sound. Other dimensions may be used as appropriate.

4 and 5 are views showing a voice capturing structure shown as another embodiment.
The difference between the voice capturing structure 1A shown in FIG. 4 and the above embodiment is that the outer peripheral surface of the main body 2 has no irregularities.
The sound capturing structure 1B shown in FIG. 5 is different from the above embodiment in that the outer peripheral surface of the main body 2 has no irregularities and two peripheral grooves 12 are provided.
Also in each of these embodiments, the same operation and effect as those of the above-described embodiments can be obtained.
Further, each of the above-described embodiments is a case in which the present invention is applied to earplugs. However, the present invention not only removes earplugs but also removes noise with a relatively high frequency to clearly hear sound. It may be applied to other devices capable of performing.

6 to 11 are graphs showing the results of experiments on the noise removal effect and the like of the voice capturing structure 1 shown in FIGS. 1 to 3.
FIG. 6 is a graph showing the noise removal effect of the voice capturing structure 1 against noise due to an electric saw, where P1 is the human body when the voice capturing structure 1 is not attached, and P2 is the human body when the voice capturing structure 1 is attached. Indicates the sound pressure level reaching Note that the chiseling sound shows almost the same tendency.
As shown in this graph, the sound pressure level reaching the human body does not attenuate voices of 1600 Hz or lower, but attenuates noise of approximately 1600 Hz or higher, and attenuates a maximum of 30 dB in some frequency regions.
FIG. 7 is a graph showing noise reduction levels of the electric saw noise and the chisel noise when the voice capturing structure 1 is attached.
FIG. 8 is a graph showing noise waveforms when the voice capturing structure 1 is not attached to the electric saw noise and when it is attached. In the figure, (a) is a noise waveform when the voice capturing structure 1 is not attached, and (b) is a noise waveform when it is attached.
9A and 9B are graphs showing the noise removal effect of the voice capturing structure 1 with respect to the noise of the jet aircraft, where P3 is the case where the voice capturing structure 1 is not attached, and P4 is the body when the voice capturing structure 1 is attached. Indicates the sound pressure level reached. Road cutters show almost the same tendency.
As shown in this graph, the sound pressure level reaching the human body does not attenuate voices of 1600 Hz or lower, but attenuates noise of approximately 1600 Hz or higher, and attenuates a maximum of 40 dB in some frequency regions.
FIG. 10 is a graph showing noise reduction of jet noise and road cutter noise when the sound capturing structure 1 is attached.
FIG. 11 is a graph showing noise waveforms of the noise of the jet aircraft when the voice capturing structure 1 is not attached and when it is attached. In the figure, (a) is a noise waveform when the voice capturing structure 1 is not attached, and (b) is a noise waveform when it is attached.

  Although the voice capturing structure 1 extremely reduces annoying treble, it does not completely eliminate the audible treble, and does not reduce the non-obnoxious sound range centered on the human voice. Furthermore, since there is a through hole between the ear canal and the outside, there is no feeling of pressure on the inner ear when wearing it, and it also prevents stuffiness, so it can withstand long-term use compared to conventional earplugs. Is possible.

  The voice capturing structure 1 can be applied not only to construction sites and factories but also to sports such as pachinko parlors, motor sports, and dart athletes that require concentration. Further, the voice capturing structure 1 is hyperaural, or because one ear is deaf, the other ear tends to be hyperaural, and the sound of rubbing tableware in an air conditioner or a restaurant may be noticed. Can be applied to people who become.

1 Voice capturing structure 2 Main body 2B Other end (sound receiving unit)
3 Mounting member (mounting part)
4 Through holes (noise attenuator)
4a small diameter part 4b large diameter part 5 sound introduction part 7 end face (noise reflection part)
8, 9 Groove 12 Circumferential groove 13 Uneven portion

Claims (6)

Comprising a body having a through hole,
With one end of the through hole being a sound introducing part, the other end is a sound receiving part,
In the through-hole, a noise attenuating portion having a cross-sectional area of the sound introduced from the sound introducing portion is such that the attenuation amount is a region including a sound having a reference frequency or less <a region exceeding the reference frequency,
A voice capturing structure having a noise removing function, characterized in that a noise reflecting portion for reflecting sound in a region exceeding the reference frequency is formed at the one end of the main body. The main body is formed to extend in one direction to form a tubular shape,
A groove is formed on the end surface of the one end of the main body so as to surround the opening of the through hole, and an outer surface of the groove is an inclined surface that expands in the extension direction of the one end.
The sound capturing structure having a noise removing function according to claim 1, wherein the groove serves as the noise reflecting portion.   The through hole includes a small diameter portion formed on the one end portion side of the main body, and a large diameter portion having a larger diameter than the small diameter portion and continuing to the small diameter portion and reaching the other end portion of the main body. The sound capturing structure having a noise removing function according to claim 1 or 2, wherein the small diameter portion constitutes the noise attenuating portion.   4. A plurality of circumferential grooves are formed on the outer peripheral surface of the main body near the one end so as to be adjacent to each other in the one direction. Voice capturing structure having the noise elimination function of the above.   5. An earplug for attaching an ear to the external auditory meatus is formed at the other end of the main body, and is configured as an earplug that attenuates noise and listens to sound. Voice capturing structure having the noise elimination function of the above.   The voice capturing structure having a noise removing function according to claim 5, wherein the mounting portion is a member made of an elastomer that is detachably attached to the main body.

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