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JPH04247171

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH04247171
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can easily
create a plurality of different sound fields having clear boundaries without providing a sound
field creation device, in particular, a partition wall or the like. The present invention relates to an
apparatus for creating a sound field.
[0002]
2. Description of the Related Art In recent years, a large toroidal pool in which water flows in one
direction is constructed in an amusement park or the like, unlike a normal pool simply storing
water, as a pool having elements of swimming and playing with water. It is gaining popularity. In
such a large-sized play facility such as a swimming pool, it is conceivable to create a different
sound field in the play facility as a means to further enhance entertainment. That is, taking a
loop-like flowing pool as an example, if a different sound field is created in the pool, the swimmer
can hear different music and sound effects every time the swimming position changes, thereby It
is possible to make the flowing pool more entertaining.
[0003]
In order to create different sound fields in the flowing pool, for example, as shown in FIG. 7, a
pair of speakers 2A, 2A are installed opposite to each other in part of the flowing pool 1, and the
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speakers 2A, If another pair of speakers 2B and 2B are installed facing each other at intervals
along 2A and the pool 1, and another music and sound effects are directed to the pool 1 from the
pair of speakers 2A and 2B, respectively. , Different sound fields A and B are created in the pool
1. As a result, the swimmer can listen to different music each time the swimming position
changes, which can further enhance the entertainment of the flowing pool.
[0004]
However, just by installing the pair of speakers 2A and 2B in the pool 1 in this way, the sound
from one speaker 2A and the sound from the other speaker 2B interfere with each other, and the
sound field A and the sound field A are generated. The boundary L with B is not clear. For this
reason, the swimmer can hear different music and sound effects every time the swimming
position changes, and thereby the effect of being able to enjoy a more varied swimming can not
be sufficiently exhibited.
[0005]
Therefore, to clarify the boundary L between the sound field A by one speaker 2A and the sound
field B by the other speaker 2B, as shown in FIG. 8, one speaker 2A and the other speaker 2B It is
necessary to install the dividing wall 3 in the interval L, that is, in the boundary L portion, or to
make the speakers 2A and 2B into directional speakers.
[0006]
However, if the partition wall 3 is installed, the line of sight becomes worse and it becomes an
obstacle to passing.
On the other hand, directional speakers are more expensive than ordinary speakers, and existing
directional speakers have the problem that high output can not be obtained due to their
characteristics.
[0007]
Therefore, an object of the present invention is to provide a sound field creating apparatus
capable of easily creating a plurality of sound fields having clear boundaries without using a
partition wall, directional speaker or the like. It is to do.
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[0008]
SUMMARY OF THE INVENTION According to the present invention, there are provided first and
second acoustic reflectors having an inner surface curved in the shape of a long side of a
spheroid, and the first and second acoustic reflectors. And the first acoustic reflector and the
second acoustic reflector are formed of the first acoustic reflector, and the first and the second
acoustic reflectors are respectively formed of the first and the second acoustic reflectors. The
distance by which the first focal position far from the first acoustic reflector and the first focal
position distant from the second reflector of the second ellipse formed by the second acoustic
reflector coincide with each other The first speakers are disposed facing each other at a distance,
and the first speakers are provided at a second focal point on the side closer to the first acoustic
reflector of the first ellipse, and the second speakers are provided in the second ellipse Of the
second focus close to the second acoustic reflector Those having features that are provided at the
positions.
[0009]
Next, the principle of the sound field creating apparatus of the present invention will be
described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the principle of the sound field creation device of the
present invention, and FIG.
As shown in FIGS. 1 and 2, the present invention utilizes the geometrical properties of a spheroid.
That is, the acoustic reflection plate 4 having an inner surface curved in the shape of the long
side end of the spheroid is assumed. The acoustic reflection plate 4 is a cup-shaped curved shape
because the spheroid is substantially egg-shaped. Then, a sound source is provided at a first focal
point (F1) position of an ellipse formed by the acoustic reflection plate 4, which is present on the
side close to the inner surface of the acoustic reflection plate 4, and a sound is emitted from this
sound source. The sound from the sound source propagates radially from the sound source,
reflects on the inner surface of the acoustic reflector 4, and converges to the second focus (F2)
position of the ellipse. At this time, the propagation distance of the sound from the sound source
to the inner surface of the acoustic reflector 4 to reach the second focal point (F2) of the ellipse
is equal in the propagation path of all the sounds. Therefore, there is no difference in sound
propagation time in each propagation path. As such, the sound from the sound source can be
clearly heard only in the vicinity of the second focus (F2) position of the ellipse, while it is
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extremely attenuated when the second focus (F2) position is deviated.
[0010]
The inventor of the present invention conducted the following tests to demonstrate the principle
of the sound field creating apparatus of the present invention described above. That is, as shown
in FIG. 3, the acoustic reflection plate 4 curved in the shape of the long side end of the spheroid
is prepared, and is formed by the acoustic reflection plate 4 present on the side close to the inner
surface of the acoustic reflection plate 4 The speaker 5 was placed at the first focus (F1) position
of the ellipse. Then, a sound with a constant sound pressure is continuously emitted from the
speaker 5 toward the inner surface side of the acoustic reflection plate 4, and the second focus
(F2) position of the ellipse 1.5 m away from the speaker 5 and the second focus (F2) A
microphone is installed at a position P outside the acoustic reflector 4 which is 1.5 m away from
the position at a right angle, and the sound pressure level of the second focus (F2) position and
the position P outside the acoustic reflector 4 Each was measured, and the sound pressure level
difference in both positions was measured. As a result, the sound pressure level difference
between the second focus (F2) position and the position P outside the acoustic reflector 4 was
about 25 dB. The relationship between the frequency and the sound pressure level at the second
focal point (F2) position and the position P outside the acoustic reflector 4 at this time is shown
in FIG.
[0011]
Next, the acoustic reflection plate 4 was removed, and the sound pressure level difference
between the position of the second focal point (F2) and the position P outside the acoustic
reflection plate 4 was measured in the same manner as described above. As a result, the sound
pressure level difference was about 3 dB. Therefore, according to the present invention, as shown
in FIG. 7, it has been found that it is possible to easily create a plurality of sound fields having
clear boundaries unlike the case where sounds are simply emitted from the speakers.
[0012]
The present invention utilizes the above-described principle, and next, one embodiment of the
sound field creating apparatus of the present invention will be described with reference to the
drawings. FIG. 5 is a cross-sectional view showing an embodiment of a sound field creation
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device according to the present invention, and FIG. 6 is a view taken along the line A-A of FIG. As
shown in FIGS. 5 and 6, according to the sound field creation device of the present invention, first
and second acoustic reflectors 6A and 6B having an inner surface curved substantially in the
shape of the long side end of the spheroid, and The first and second acoustic reflectors 6A and
6B are provided with first and second speakers 7A and 7B respectively provided toward the inner
surfaces of the first and second acoustic reflectors 6A and 6B. Since the first and second acoustic
reflectors 6A and 6B are installed on a horizontal floor, they are not perfect spheroids, and their
lower portions are formed flat as shown in FIG.
[0013]
The first acoustic reflector 6A and the second acoustic reflector 6B have a first focal position on
the side far from the first acoustic reflector 6A of the first ellipse O1 formed by the first acoustic
reflector 6A. FC) and the first focal position (FC) of the second ellipse O2 formed by the second
acoustic reflector 6B on the side far from the second acoustic reflector 6B face each other at an
interval corresponding to each other Is installed. The first speaker 7A is provided at a second
focal position (FA) on the side near the first acoustic reflector 6A of the first ellipse O1, and the
second speaker 7B is a second acoustic reflector of the second ellipse O2. It is provided at the
second focus position (FB) on the side closer to 6B
[0014]
Since the sound field creating apparatus of the present invention is configured as described
above, as shown in FIGS. 4 and 5, the sound field creating apparatus of the present invention can
be used, for example, along the flowing pool 1. If a plurality of sound sources are provided side
by side, the sound from the first and second speakers 7A and 7B in one sound field creation
device and the sound from the first and second speakers 7A and 7B in the other sound field
creation device Are difficult to interfere with each other. Therefore, the border L between the
sound field A by the speakers 7A and 7B in one sound field creating device and the sound field B
by the speakers 7A and 7B in the other sound field creating device becomes clear, so the
swimmer swims Each time the position changes, different music and sound effects can be heard,
which can make the flowing pool more entertaining. Needless to say, the present invention can
also be applied to other facilities besides the pool described above.
[0015]
As described above, according to the present invention, it is possible to easily create a plurality of
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sound fields having clear boundaries without using partition walls, directional speakers and the
like. It has useful effects such as
[0016]
Brief description of the drawings
[0017]
1 is a cross-sectional view showing the principle of the sound field creation device of the present
invention.
[0018]
2 is a view on the line AA of FIG.
[0019]
3 is a cross-sectional view showing an experimental method for demonstrating the principle of
the sound field creation device of the present invention.
[0020]
4 is a graph showing the relationship between the frequency and the sound pressure level at the
position of the second focus (F2) and the position P outside the acoustic reflector.
[0021]
5 is a cross-sectional view showing an embodiment of the sound field creation device of the
present invention.
[0022]
6 is a view on the line AA of FIG.
[0023]
7 is a plan view showing a conventional sound field creation device.
[0024]
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8 is a plan view showing a conventional sound field creation device.
[0025]
Explanation of sign
[0026]
Reference Signs List 1 pool 2A, 2B 5 speaker 3 partition wall 4 acoustic reflector 6A first
acoustic reflector 6B second acoustic reflector 7A first speaker 7B second speaker
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