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JP2005124031

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005124031
PROBLEM TO BE SOLVED: To provide a sound collector in which the reduction in sound
collection performance and the prevention of contamination of a microphone disposed in a
sound collection hood are both achieved. SOLUTION: In a sound collector provided with a sound
collecting hood and a microphone disposed inside the sound collecting hood, at least this sound
receiving in the sound collecting hood is disposed in front of the sound receiving surface of the
microphone. The liquid crystal display further includes a partition that isolates the rear area
including the surface from the outside of the sound collecting hood, and a sound absorbing
material disposed to surround the periphery of the sound receiving surface of the microphone.
[Selected figure] Figure 5
Sound collector
[0001]
The present invention relates to a sound collector that collects sound with a microphone
disposed inside a hood.
[0002]
Conventionally, the surface to be inspected is hit with a striking tool such as a hammer, and the
sound generated during the impact (hereinafter referred to as hitting sound) is collected by a
microphone and analyzed. A percussion sound inspection system for detecting a defect such as a
cavity existing inside is known (see, for example, Non-Patent Document 1).
[0003]
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In the percussion sound inspection system described in the above-mentioned Non-Patent
Document 1, sound collection of percussion sound is performed with a stethoscope-type sound
collection hood for disposing a microphone in the center and shielding ambient sound. It is done
by the
In addition, the inventor of the present invention also proposes a sound collector in which the
sound collection performance is improved by arranging the sound absorbing material so as to
surround the side surface of the microphone (Patent Document 1).
[0004]
FIG. 1 shows an abnormality generated in the mechanical equipment by collecting and analyzing
an operation sound generated from the hammer inspection system other than the hammer
inspection system described in Non-Patent Document 1 and the mechanical equipment. It is
sectional drawing of the sound collector generally employ ¦ adopted also in the mechanical
equipment diagnostic system etc. which detect.
[0005]
The sound collector 100 shown in FIG. 1 is for fixing the sound collecting hood 101, the
microphone 102, and the microphone 102 inserted through the hole 101a formed on the rear
end side of the sound collecting hood 101 to the sound collecting hood A fixture 103 is provided.
[0006]
FIG. 2 is a diagram showing a voltage waveform output from the sound collector when the tone
burst having a duration of 2 ms is collected by the sound collector shown in FIG.
[0007]
FIGS. 2 (a) to 2 (c) show voltage waveforms when the tone burst frequency is 9 kHz, 11 kHz and
13 kHz, respectively.
[0008]
By the way, the sound collectors used for the hit sound inspection system and the mechanical
equipment diagnostic system, etc., are misty form invisible such as rain and snow outdoors, or
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even lubricating oil etc. indoors. In the use under the environment where it scatters, the
contamination of the microphone causes the contamination of the diaphragm of the microphone,
so that the mass of the diaphragm changes and the characteristics of the microphone change,
and accurate acoustic diagnosis can not be performed.
[0009]
Therefore, it is conceivable to prevent the contamination of the microphone by covering the
opening of the sound collecting hood with a sheet-like material.
[0010]
Fig. 3 shows an output from the sound collector when a tone burst having a duration of 2 ms is
collected with the sound collection hood opening of the sound collector shown in Fig. 1 covered
with a 0.1 mm thick vinyl sheet Is a diagram showing a voltage waveform to be generated.
[0011]
In FIGS. 3 (a) to 3 (c), similarly to FIGS. 2 (a) to 2 (c), the sound was output from the sound
collector by the generation of tone bursts of 9 kHz, 11 kHz, and 13 kHz. A voltage waveform is
shown, but here it shows a long tailed waveform that is far from the waveforms shown in FIGS. 2
(a) to 2 (c).
[0012]
FIG. 4 is a diagram showing a voltage waveform obtained when a film thinner than the vinyl
sheet used in FIG. 3 is used.
[0013]
4 (a) to 4 (c) also show voltage waveforms output from the sound collector by the generation of
tone bursts with frequencies of 9 kHz, 11 kHz, and 13 kHz. A waveform is shown in which the
way of pulling the tail is weakened a little more than the waveforms shown in (a) to (c) of FIG.
[0014]
However, the waveforms shown in FIGS. 4 (a) through 4 (c) are also far from the waveforms
shown in FIGS. 2 (a) through 2 (c).
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This is because the sound wave incident in the hood is multiply reflected between the inner wall
of the hood and the vinyl sheet.
[0015]
For this reason, the sheet-like material is usually used in a loose state rather than in a taut state.
"Inspection technology", July 2002, pp. 41-45 (Technical topics: architecture, civil engineering)
Patent No. 3222237
[0016]
However, as described above, when the sound collecting hood with the sheet attached is used
outdoors in a loose state, the sheet may be loosened by the wind and acoustic noise may be
generated, and the acoustic diagnosis may be accurate. There is a problem that you can not do
[0017]
An object of the present invention is to provide a sound collector in which the prevention of the
decrease in the sound collection performance outdoors and the prevention of the contamination
of the microphone disposed in the sound collection hood are achieved in view of the above
circumstances. .
[0018]
In order to achieve the above object, the sound collector of the present invention has an opening
at the front end, a rotating surface shaped sound reflecting inner wall having a focal point behind
this opening and at least on the opening side an inner space is formed. A sound collecting hood, a
microphone having at least a sound receiving surface disposed in the sound collecting hood with
the sound receiving surface facing forward, and receiving a sound wave incident in the sound
collecting hood; A sound absorbing material disposed in the sound collecting hood so as to
surround the periphery of the sound surface; at least a rear region including the sound receiving
surface of the inner space disposed forward of the sound receiving surface; The sound hood is
characterized by including a partition wall isolated from the outside.
[0019]
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The sound collector of the present invention is provided with a partition located on the opening
side of the sound collection hood with respect to the sound reception surface of the microphone,
and a sound absorbing material surrounding the periphery of the sound reception surface of the
microphone. The standing wave generated by multiple reflection of the sound wave between the
inner wall surface of the sound collecting hood of the conventional sound collector without the
sound absorbing material surrounding the sound receiving surface of the microphone and the
partition wall is the present invention. The generation at the sound collector is suppressed by the
presence of the sound-absorbing material arranged as described above in the sound collection
hood of the sound collector of the invention.
Further, the partition used in the sound collector of the present invention is a sheet-like material
in a stretched state which has been considered to be unusable conventionally, and the partition
does not leak due to the wind.
Therefore, according to the sound collector of the present invention, it is possible to achieve both
the prevention of the decrease in the sound collection performance and the prevention of the
contamination of the microphone.
[0020]
Here, it is preferable that the sound collecting hood further has a sound absorbing material
disposed along the periphery of the opening.
[0021]
As described above, when the sound absorbing material is disposed along the peripheral edge of
the opening, the sound wave coming from the side or the back of the hood and being diffracted
at the edge of the opening of the hood and attenuated into the hood is attenuated. It can
contribute to suppressing the penetration of the sound wave itself between the sound collecting
hood inner wall surface and the partition wall.
[0022]
Moreover, it is also a preferable aspect that the said partition is a partition which consists of a
sheet ¦ seat which has sound permeability.
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[0023]
Thus, the partition may be a sheet as long as it has sound permeability.
[0024]
Furthermore, it is also a preferable aspect that the said partition is detachable to the said sound
collection hood.
[0025]
This is convenient because replacement of the partition wall can be easily performed if the
partition wall is contaminated.
[0026]
ADVANTAGE OF THE INVENTION According to the sound collector of this invention, coexistence
with the fall prevention of a sound-collection performance and the fouling prevention of the
microphone arrange ¦ positioned in a sound-collection hood can be achieved.
[0027]
Hereinafter, embodiments of the present invention will be described.
[0028]
FIG. 5 is a cross-sectional view of an embodiment of the sound collector of the present invention.
The same type as shown in FIG. 1 as shown in FIG. 5 is given the same reference numeral as that
shown in FIG.
[0029]
In FIG. 5, the sound collecting hood 101, the microphone 102, the fixture 103, the vinyl chloride
sheet 104 covering the opening of the sound collecting hood, and the microphone 102, which
constitute the sound collector 1 of the present embodiment, are arranged. Glass wool 105 is
shown, and in the sound collector 1 of the present embodiment, the glass wool 105 is disposed
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around the microphone as compared to the conventional sound collector 100 shown in FIG. The
vinyl chloride sheet 104 covers the opening of the sound collecting hood 101.
The sound receiving surface of the microphone 102 is disposed at the focal position of the sound
collecting hood 10.
[0030]
FIG. 6 is a view showing a vinyl chloride sheet attached to a sound collecting hood.
[0031]
In FIG. 6, a vinyl chloride sheet 104 cut to a size enough to cover the opening of the sound
collecting hood with ample margin is used to cover the opening of the sound collecting hood with
this vinyl chloride sheet 104. It is shown that it is attached to the sound collecting hood 101 by a
frame 1041 having a diameter slightly longer than the diameter of the opening, which can be
fitted around the opening of the sound collecting hood while winding the end of the vinyl
chloride sheet. In the sound collector 1 of the embodiment, the replacement of the vinyl chloride
sheet 104 can be easily performed.
[0032]
Here, FIG. 7 is a diagram showing the sound collecting performance of the sound collector 1 of
the present embodiment by frequency.
[0033]
FIG. 7 shows the voltage waveform output from the sound collector 1 when the same tone burst
as the tone burst used in obtaining the voltage waveforms shown in FIGS. 2 to 4 is collected by
the sound collector 1. ing.
[0034]
On the other hand, FIG. 8 is a figure which shows the sound collection performance of the sound
collector of this embodiment according to frequency in the state which removed the vinyl
chloride sheet which covers opening.
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Here, too, the same tone burst as that collected in FIG. 7 is collected.
[0035]
In FIG. 8, in the case of the sound collector 1 in a state where the vinyl chloride sheet is removed
from the opening of the sound collecting hood, the conventional one does not have glass wool
around the microphone in addition to the vinyl chloride sheet covering the opening of the sound
collecting hood. It is shown that a voltage waveform substantially the same as the voltage
waveform output from the type of sound collector 100 is output.
However, compared to the conventional type, the change in voltage amplitude due to frequency
is small.
[0036]
From FIG. 7, although it has a tail somewhat compared with FIG. 8, the conventional collection
which only the opening of the sound-collection hood was covered with the vinyl chloride sheet
shown in FIG. It can be seen that a much better sound pressure waveform is obtained compared
to the voltage waveform output from the sound device.
[0037]
FIG. 9 is a view showing the sound collection performance of the sound collector of the present
embodiment according to the frequency according to frequency, in which the opening is replaced
with a thin film having a thickness greater than this vinyl chloride sheet instead of a vinyl
chloride sheet.
Here, too, the same tone burst as that collected in FIG. 7 is collected.
[0038]
FIG. 9 shows a waveform that is even better than the voltage waveform shown in FIG.
[0039]
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That is, FIG. 3 showing the voltage waveform output from the conventional sound collector 100
when collecting the same tone burst is compared with FIG. 7 showing the voltage waveform
output from the sound collector 1 of the present embodiment. As is apparent from the above, in
the sound collector 1 of this embodiment, even if the opening of the sound collecting hood is
covered with polyvinyl chloride, the glass wool disposed around the sound receiving surface of
the microphone in the sound collecting hood Generation of standing waves generated between
the inner wall of the sound collecting hood of the conventional sound collector and the partition
wall provided with only the partition wall and no sound absorbing material surrounding the
periphery of the sound receiving surface of the microphone Since the voltage waveform output
from the sound collector 1 of this embodiment is less than the voltage waveform output from the
conventional sound collector 100, the decrease in the sound collection performance is prevented.
Therefore, according to the sound collector 1 of the present embodiment, it is possible to achieve
both the prevention of the decrease in the sound collection performance and the prevention of
the contamination of the microphone disposed in the sound collection hood.
In addition, this effect is not something which is used to cover the opening of the sound
collecting hood and to replace the vinyl chloride with a film thinner than this vinyl chloride.
[0040]
In the embodiment described above, the case where the sound absorbing material is arranged
around the microphone in the sound collecting hood of the sound collector is described as an
example, but this sound absorbing material is the peripheral edge of the opening of the sound
collecting hood By using a sound collector arranged also, the sound is collected by attenuating
the sound waves coming from the side or back of the hood and diffracted at the edge of the
opening of the hood and entering the hood. The sound wave itself which intrudes between the
inner wall surface and the partition wall can be suppressed.
Thereby, it can contribute to the fall prevention of sound collection performance.
[0041]
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Here, FIG. 10 is a cross-sectional view of an example of the sound collecting hood in which the
sound absorbing material is also disposed at the peripheral edge of the opening of the sound
collecting hood.
In addition, the same reference numerals as in the above embodiment are attached to the same
types as those used in the above embodiment, which are shown here.
[0042]
As described above, in the sound collecting hood 101 shown in FIG. 10, in addition to the
periphery of the microphone 102, glass wool 106, which is a sound absorbing material, is also
arranged around the entire periphery of the opening.
The glass wool 106 on the peripheral portion of the opening is not limited to the one disposed on
the entire periphery as shown in FIG. 10, and may be removable.
[0043]
Also, as described above, glass wool 105 is placed around the periphery of the sound collecting
hood opening 104 in addition to the periphery of the microphone 102, and the sound waves that
are diffracted at the edge of the opening of the hood are attenuated. The degradation of
directivity is also suppressed by doing this.
[0044]
FIG. 11 is a graph showing the directional characteristics of the sound collector.
[0045]
In FIG. 11 (a), the directional characteristic of the sound collector in which the sound absorbing
material is disposed only around the microphone, and in FIG. 11 (b), in addition to the periphery
of the microphone, on the periphery of the opening of the sound collecting hood Also, the
directivity characteristics of the sound collector, which is one aspect of the above embodiment in
which the sound absorbing material is disposed, is shown for each frequency.
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[0046]
From FIG. 11, the sound absorbing material is disposed at the periphery of the opening of the
sound collection hood in addition to the periphery of the microphone, and the directivity
characteristics to the side and the back of the sound collector are improved for 1 kHz, especially
right behind It can be read that the improvement of directivity with respect to the direction is
remarkable, and for 10 kHz, it can be read that the directivity of the direction close to the front
of the sound collector is improved.
[0047]
Furthermore, by arranging the sound absorbing material also on the periphery of the opening of
the sound collecting hood, it is possible to cushion the impact when the opening of the sound
collector contacts the object to be inspected and provide an effect of preventing the both from
being damaged. .
[0048]
Furthermore, by arranging the sound absorbing material also on the periphery of the opening of
the sound collecting hood, it is possible to cushion the impact when the opening of the sound
collector contacts the object to be inspected and provide an effect of preventing the both from
being damaged. .
[0049]
In the present embodiment, the case where a sheet-like material such as vinyl chloride or a film is
adopted as the partition wall is described as an example, but the present invention is not limited
to these as long as it has sound wave permeability. The position of the partition wall in the sound
collecting hood is not limited to the opening surface as long as it is on the front side of the sound
receiving surface of the microphone.
Further, although the case where the partition wall is detachable to the sound collecting hood has
been described as an example, the present invention is not limited to this, and even if the
partition wall is fixed to the sound collecting hood Although the effect is not reduced, and
further, an example in which glass wool is adopted as the sound absorbing material has been
described, the present invention is not limited to this as long as it has a sound absorbing
function.
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Further, the partition wall is not limited to a flat surface and may be a curved surface or the like.
[0050]
In addition, a mesh-like or grid-like guard may be provided on the surface of the partition wall or
on the front side of the partition wall to prevent breakage of the partition wall.
[0051]
Further, in the present embodiment, the sound absorbing material is described as being disposed
outside the periphery of the opening of the sound collecting hood as an example, but the present
invention is not limited thereto. It may be arranged.
[0052]
It is sectional drawing of the sound collector generally employ ¦ adopted.
It is a figure which shows the voltage waveform output from a sound collector when a tone burst
of 2 ms duration is collected with the sound collector shown in FIG.
It is a figure which shows the voltage waveform output from a sound collector when the tone
burst of 2 ms duration is collected.
It is a figure which shows the voltage waveform obtained when using a film thinner than the
vinyl sheet ¦ seat used in FIG.
It is sectional drawing of one Embodiment of the sound collector of this invention.
It is a figure which shows the vinyl-chloride sheet attached to the sound-collection hood.
It is a figure which shows the voltage waveform output from the sound collector of this
embodiment in the state which removed the vinyl chloride sheet which covers the opening of a
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sound-collection hood.
It is a figure which shows the voltage waveform output from the sound collector of this
embodiment by which the opening of the sound collection hood was covered with the vinyl
chloride sheet.
It is a figure which shows the voltage waveform output from the sound collector of this
embodiment with which the vinyl chloride which covers a sound collection hood was replaced ¦
exchanged for the film whose thickness is thinner than this vinyl chloride.
FIG. 6 is a cross-sectional view of an example of the sound collecting hood in which the sound
absorbing material is also disposed at the peripheral edge of the opening of the sound collecting
hood.
It is a graph which shows the directional characteristic of a sound collector.
Explanation of sign
[0053]
Reference Signs List 1, 100 sound collector 101 sound collecting hood 101 a 102 microphone
102 a sound receiving surface 103 fixture 104 polyvinyl chloride 105, 106 glass wool
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