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JPH02265397

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DESCRIPTION JPH02265397
[0001]
[Industrial field of application 1] The present invention relates to an acoustic device adapted to
emit sound waves only in a specific area. 2. Description of the Related Art There are a wide
variety of sounds in the world, such as the sound of a full 0, such as the noise of a train or rate,
the sound of a neighboring piano or stereo. The noise of trains and cars is hoped that everyone
should be small, but the sound of the stereo or television in the next room is only a total noise
from the perspective of others, but we actively try to enjoy it Because there are people, the result
is only derived. The former noise has to wait for technical development for noise reduction, but
in the latter case it can be reduced with the user's slight attention. For example, it is sufficient to
reduce the volume of the stereo or television, but this requires the user to use the device without
being satisfied with the volume point. It only needs to be heard by the people on the platform, it
is only noise to those outside the station, in this case it is not possible to squeeze the volume
down, even to the people at the end of the home clearly A minimum volume is required to make
it audible. [Problems to be Solved by the Invention] However, since the sound spreads in a foursided stupid manner, in the existing speaker, there is a problem that the sound is transmitted in
an unnecessary direction. Then, although a directional speaker can be considered, since this
directional speaker does not direct only in one direction, if it is going to transmit a sound to the
next area, it is necessary to rotate a directional speaker, There is a problem that the rotating
device becomes large-scale because the cord is wound and the weight of one piece is heavy.
SUMMARY OF THE INVENTION The present invention has been made in view of the problems of
the prior art described above, and its object is to provide an acoustic device capable of easily
changing the audible area of a directional speaker. It is in. [Means for Solving the Eight Problems:
The acoustic device of the present invention includes a paranodolic speaker 1 configured to emit
a sound wave only in a specific region, and a reflector 2 that reflects the sound wave emitted
from the parametric speaker 1 , And the reflecting plate 2 is rotatable. By adopting such a
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configuration, the above-described object of the present invention is achieved. [Action 1]
According to the present invention, the sound wave emitted from the puff metric speaker 1 is
reflected by the reflection plate 2 to emit the sound wave to a specific area. In this case, the
reflection plate 2 is rotated. By doing this, it becomes possible to vary the radiation area of the
sound wave emitted from the parametric speaker 1 by freely changing the reflection direction of
the sound wave emitted from the puffmetric speaker 1.
The present invention will be described in detail based on the embodiments shown in the
attached drawings. FIG. 1 shows an embodiment of the present invention. In this embodiment,
the rotation axis 3 of the reflector 2 is disposed on an axis O which passes through the center of
the parametric speaker 1 and which is perpendicular to the speaker surface of the puff metric
speaker 1. It is inclined against. In the embodiment of FIG. 1 it is inclined 45 °. The rotating
shaft 3 is rotated by a driving device 4 such as a motor. Here, the principle of the parametric
speaker 1 will be described. As a directional speaker to send out to a specific area with directivity
of sound, ultrasonic waves with strong directivity are used, and two sounds with slightly different
frequencies as shown in Fig. 2! , F, as shown in FIG. 2 (a) simultaneously, and the two sounds Left
interfere in the air, and as shown in FIG. 2 (b), the frequencies of the sum and difference of the
two frequencies are A new sound is generated, and if it takes two sound f, if it is f2, it hibernates
a sound wave that can not be heard by a person, so that the sound f t −f z of the frequency
difference between these two sounds fl th becomes an audible sound If set to, the audible sound
generated in the air can be sent out to people in a specific area with directivity. By the way, in the
embodiment of FIG. 2, the vibrator is driven by a modulation wave in which the carrier high
frequency f is amplitude-modulated by an audio signal (audible signal), and this modulation wave
is shown in FIG. As described above, the upper and lower side bands are provided, and the upper
and lower side bands are provided, and the two ultrasonic waves fltf2 generated corresponding
to the upper and lower fill wave respectively are in the air. And the non-linear interaction of
subject sound waves in the air reproduces the audible sound corresponding to the difference
frequency, ie, the sound corresponding to the original sound signal. Such a phenomenon is called
"non-linear interaction" or "non-linear parametric action" of sound waves, and the generation of
the difference sound utilizes the "non-linearity" of the medium of air, which is called a parametric
speaker. It is called. Thus, in the embodiment of FIG. 1, when sound waves are emitted from the
parametric speaker 1, sound waves having sharp directivity are emitted only in a specific
radiation area, and sound waves having this directivity are specified by the reflector 2. It will be
reflected to the area. Here, when the drive device fi 4 such as a motor is driven to turn the
reflection plate 2, the reflection region of the reflected sound wave having the sharp directivity
on the plane is rotated about the axis 0 Moving.
Here, it is possible to obtain a planar audible area by rotating at a reverberation time or more.
FIG. 3 shows another embodiment of the present invention. In this embodiment, the reflector 2 is
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disposed on an axis P parallel to a line passing through the centers of a plurality of (two in the
embodiment of FIG. 3) parametric speakers 1 with the direction of the parametric speakers 1
aligned. The reflecting plate 2 is adapted to be rotated by a driving device 4 such as a motor in
front of the axis P and parallel to the wedge P. Even in this embodiment, sound waves having
directivity emitted from a plurality of parametric speakers 1 are respectively reflected in a
specific direction by the reflector 2. However, when reflection @ 2 is rotated, the same reason as
the embodiment of FIG. 1 is obtained. A flat audible region can be obtained. Also in this case, it is
rotated in the reverberation time or more. Further, in this embodiment, a plurality of the abovementioned planar audible areas are formed in the upper and lower portions respectively
corresponding to the buffmetric speakers 1 located in the upper and lower positions. FIG. 4
shows an application example using the acoustic device of the present invention which can
obtain a flat aS region as shown in FIG. 1 and FIG. In this use example, two sets of the
combination of the parametric speaker 1 and the reflector 2 shown in FIG. 1 in the acoustic
device A are arranged vertically or the one shown in FIG. 13 is arranged. The sound waves
respectively radiated from the upper and lower parametric speakers 1 are reflected by the
rotating reflecting plate 2 to be planarized! 1! The area is formed at the top and bottom, and
another explanation is given before the upper parametric speaker 1 and the lower parametric
speaker 1 (for example, in the use example of # + 4 illustration acoustic sound provided for the
Atf of a zoo animal cage) Because it's a device, it's upside down) ')-/ Csbyka 1 to make a little
professional explanation for adults for the animal, and the lower parametric speaker 1 to make a
simple and fun explanation for children) By setting the height of the upper and lower planar
audible areas to a height at which only adult 5 can hear and a height at which only child 6 can
hear, respectively, it is possible to hear explanations corresponding to each. . FIG. 5 shows
another embodiment of the present invention. In this embodiment, the reflecting plate 2 disposed
in front of the parametric speaker 1 is rotated about the rotation axis 3 but may not be
continuously rotated as in the above-described embodiment (an arbitrary angle By rotating, for
example, the audible area can be changed from the Af) @ area in FIG. 5 to the B /) area in tIIi5.
In FIG. 4, the vertical width of the aS area for the adult 5 is shown, and h2 is the vertical width of
the audible area for the child 6. Moreover, 7 in FIG. 4 is a fence of an animal. Although the
embodiment in which the parametric speaker 1 is placed horizontally or vertically is shown in
each of the above embodiments, the parametric speaker 1 may be vertically or inclined in FIG. In
the embodiment of FIGS. 3 and 5, the parametric speaker 1 may be horizontal or inclined. By
doing this, it is possible not only to end up as an audible area in the horizontal plane, but also as
an audible area in the vertical plane or as an audible area in the form of a slope. [Effects of the
Invention] In the present invention, it comprises a buffometric speaker in which sound waves are
emitted only to a specific area as described above, and a reflector for reflecting the sound waves
emitted from parametric speakers, Since this reflector is rotatable, by rotating the reflector, the
radiation region of the sound wave emitted from the buffometric speaker can be varied by freely
changing the reflection direction of the sound wave emitted from the parametric speaker In this
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case, it is only necessary to rotate the reflector without rotating the heavier heavy parametric
speaker, so a low-torque drive unit (or no cord etc. is attached). Also, it is possible to install the
parametric speaker indoors without rain and install the reflector outdoors. Then waterproof
process is one that requires a simple.
[0002]
Brief description of the drawings
[0003]
1 is a schematic perspective view of an embodiment of the present invention, FIGS. 2 (a), 2 (b)
and 2 (c) are principle diagrams of a parametric speaker, and FIG. 3 is a schematic perspective
view of another embodiment of the present invention, FIG. 4 is a schematic perspective view
showing one use example of the present invention, FIG. 5 is a schematic perspective view of still
another embodiment of the present invention, 1 is a parametric speaker, and 2 is a reflector.
Agent Patent Attorney Stone 1) 7 Figure 3
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