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DESCRIPTION JP2003047096

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DESCRIPTION JP2003047096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
superdirective speaker device for level crossing which emits audible sound for warning of the
existence of level crossing or passing of a train etc. in advance only to a specific space area. It is
about
[0002]
2. Description of the Related Art FIG. 4 is a schematic perspective view showing an installation
state of a conventional alarm speaker used for level crossing in a train or the like. In FIG. 4, 10 is
an alarm speaker, 11 is a support pillar for attaching the alarm speaker 10, 102 is a crossing
barrier, 102 is a space area where sound emitted from the alarm speaker 10 is radiated
(hereinafter referred to as sound radiation In the space area, 110 is a train, 120 and 121 are
crossing users, 122 is a vehicle, and 130 is a road leading to the crossing.
[0003]
As shown in FIG. 4, the alarm speaker 10 provided on the column 11 has the same direction as
the road 130 or the crossing users 120 and 121 so that the warning sound is generally heard by
the crossing users 120 and 121. Will be installed towards the The sound reproduced by the
alarm speaker 10 has many high-pitched alarm sounds, and the sound emission space area 105
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where the sound is emitted is not only the users of the crossings 120 and 121, the driver of the
vehicle 122 but also residences near the crossings. Extend to the general population. In
particular, warning noise is unnecessary for residents near the level crossing, which causes noise
pollution.
[0004]
As a conventional alarm speaker 10, for example, as shown in FIG. 4, a kind of horn speaker
called trumpet shape capable of generating a large volume is often used. FIG. 5 is a perspective
view showing the appearance of an np210 speaker manufactured by Nobol Electric as an
example of a commercially available trumpet-shaped speaker. The alarm speaker 10 shown in
FIG. 5 is roughly composed of acoustic horns 10A and 10B and a housing 10C for housing
driving devices (not shown) for the acoustic horns 10A and 10B.
[0005]
Since such a trumpet type speaker is a kind of horn speaker, its directivity characteristic is
almost equal to that of the conventional horn speaker. FIG. 6 is a pattern diagram showing the
directivity pattern of a general trumpet-shaped speaker. In FIG. 6, the directivity pattern is
symmetrical to the left and right with respect to the front surface (0-degree direction) of the
alarm speaker 10, and has a sound radiation space area 105 up to a fairly wide angle. In
particular, in the alarm sound, it is possible to listen to almost any position in the front space of
the speaker 10.
[0006]
As described above, when the conventional trumpet-shaped speaker is used for a crossing alarm
speaker, the alarm sound from the alarm speaker 10 generally propagates to a wide area around
the crossing. And there was a problem that noise pollution was caused to the houses near the
level crossings and the residents around them.
[0007]
The present invention has been made to solve the above-mentioned problems, and it is possible
to clearly transmit the alarm sound to the crossing user and transmit as much as possible to the
residents around the crossing. It is an object of the present invention to provide a superdirectional speaker device for a level crossing which greatly reduces noise by not causing the
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noise.
[0008]
SUMMARY OF THE INVENTION The superdirective speaker device for level crossing according to
the present invention comprises: a sound source for generating an audible sound signal; and an
ultrasonic wave generation means for generating a carrier wave belonging to an ultrasonic
frequency band; It comprises an ultrasonic wave generation means and a modulation means for
modulating an audible sound signal, an amplification means for amplifying the signal modulated
by the modulation means, and an ultrasonic wave emitter for acoustically converting the output
from the amplification means. .
[0009]
The ultra-directional speaker apparatus for level crossing according to the present invention
comprises an ultrasonic radiator composed of a plurality of ultrasonic transducers arranged
closely and driven by the same signal.
[0010]
In the leveling superdirective speaker device according to the present invention, the ultrasonic
radiator is attached so that the sound radiation direction is directed to a passerby, a vehicle or
the like using the leveling.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present
invention will be described.
Embodiment 1
FIG. 1 is a perspective view showing an installation state of a leveling superdirective speaker
device according to a first embodiment of the present invention.
Among the components of the first embodiment, the same components as those of the
conventional speaker device shown in FIGS. 4 to 6 are designated by the same reference
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numerals, and the description thereof will be omitted.
This point is the same in the description of the drawings described later.
[0012]
In FIG. 1, 5 is a sound source such as an alarm sound, 6 is a modulator (modulating means) for
modulating a signal from the sound source 5 into an ultrasonic signal, 7 is an amplifier
(amplifying means), and 100A and 100B are ultrasonic radiations. , 102A and 102B are crossing
barriers, 105A and 105B are sound radiation space areas where sound is emitted by the
ultrasonic radiators 100A and 100B, and 130A and 130B are roads leading to the crossing.
[0013]
Next, the operation will be described.
A signal such as an alarm sound generated by the sound source 5 in FIG. 1 is modulated by the
modulator 6 into an ultrasonic signal having an ultrasonic wave as a carrier wave.
Next, this ultrasonic signal is amplified by the amplifier 7 and converted into an acoustic signal
by the ultrasonic radiators 100A and 100B. In general, an ultrasonic signal is a signal that can
not be heard as a sound, but when radiated into air, it is demodulated due to non-linearity of air
and can be heard as an original alarm sound. The directivity characteristics from the ultrasonic
radiators 100A and 100B are very sharp, and the sound radiation space areas 105A and 105B
are formed in a beam shape in front of the ultrasonic radiators 100A and 100B.
[0014]
Here, the ultrasonic radiators 100A and 100B in FIG. 1 are attached in the middle between the
columns 11 corresponding to the central upper positions of the roads 130A and 130B,
respectively, and the sound radiation directions thereof are of the roads 130A and 130B. It is in
line with the direction. As a result, beam-like acoustic signals are emitted only to users on roads
130A and 130B, and no acoustic signals are emitted to houses near the railroad crossing and
residents in the vicinity thereof, so no noise problem occurs. .
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[0015]
However, in the first embodiment, the mounting positions of the ultrasonic radiators 100A and
100B are installed on either of the roads 130A and 130B so as not to give noise to the people
nearby depending on the crossing conditions. Of course it may be done. Of course, the sound
radiation direction in the first embodiment may be directed to the directions of the roads 130A
and 130B and to the users of the roads 130A and 130B.
[0016]
FIG. 2 is a block diagram showing the construction of the leveling superdirective speaker device
shown in FIG. In FIG. 2, the modulator 6 is roughly composed of an ultrasonic signal generator
6A and a modulator 6B. 9 is an ultrasonic transducer, 8 is a mounting plate of the ultrasonic
transducer 9, and 100 is an ultrasonic emitter.
[0017]
In FIG. 2, the ultrasonic radiator 100 is composed of a mounting plate 8 and a plurality of
ultrasonic transducers 9 closely arranged on the mounting plate 8. For example, a piezoelectric
transducer etc. can be illustrated as the ultrasonic transducer 9. By arranging a plurality of the
ultrasonic transducers 9 closely on the mounting plate 8, uniform high sound pressure can be
obtained on the radiation surface thereof. It is possible to reproduce ultrasonic waves.
[0018]
Next, the operation will be described. In FIG. 2, an acoustic signal such as an alarm sound
generated by the sound source 5 is modulated with the carrier wave signal from the ultrasonic
signal generation means 6A by the modulation means 6B having a modulation function such as
amplitude modulation. Next, the modulated ultrasonic signal is power amplified by the amplifier
7 and provided to drive the ultrasonic radiator 100.
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[0019]
In the ultrasonic radiator 100, a plurality of ultrasonic transducers 9 arranged closely are driven
by the same signal. As an example of the configuration for realizing the same signal driving, it is
conceivable to connect each ultrasonic transducer 9 in parallel connection, but it is possible to
carry out not only this but also serial connection or series-parallel connection. .
[0020]
As for the configuration of the ultrasonic radiator 100, as described above, the plurality of
ultrasonic transducers 9 need not be arranged, and any conventional ultrasonic transducer can
be used as long as ultrasonic waves can be emitted from the mounting surface. It goes without
saying that shaped speakers, horn shaped speakers, speakers using a polymer piezoelectric
material, etc. may be used.
[0021]
FIG. 3 is a pattern diagram showing the directivity characteristics of the ultrasonic radiator 100
shown in FIG.
Since the ultrasonic emitter 100 is driven by the modulated ultrasonic signal, its directivity
pattern is a very sharp sound in the front direction of the ultrasonic emitter 100 as shown by the
sound radiation space area 105 in FIG. It is made up of dynamic beams. For this reason, the
alarm sound reproduced from the ultrasonic radiator 100 propagates straight forward.
Therefore, if the warning sound is emitted in the direction of the road at the level crossing, it
becomes possible to clearly transmit the warning sound only to persons in that direction.
[0022]
As described above, according to the first embodiment, since the highly directional ultrasonic
radiator 100 is applied to the crossing, alarm sound is emitted only to a specific space area near
the crossing. It is possible.
[0023]
According to the first embodiment, the ultrasonic radiator 100 is composed of a plurality of
ultrasonic transducers 9 closely arranged and driven by the same signal, so that only in a specific
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space area near the crossing. It is possible to emit an alarm sound.
[0024]
According to the first embodiment, since the ultrasonic radiator 100 is attached to direct the
sound radiation direction to the passersby 120, 121, the vehicle 122, etc. using crossings, a
warning to the crossings user is given. In addition to clearly transmitting sound, noise can be
greatly reduced by not transmitting alarm sounds as much as possible to the residents in the
vicinity of the level crossing, so the noise problem to the population in the vicinity of the level
crossing is not generated. is there.
[0025]
As described above, according to the present invention, the sound source generating the audible
sound signal, the ultrasonic wave generating means generating the carrier wave belonging to the
ultrasonic frequency band, and the ultrasonic wave generating means A modulation means for
modulating an audible sound signal, an amplification means for amplifying the signal modulated
by the modulation means, and an ultrasonic emitter for acoustically converting the output from
the amplification means are provided. The alarm sound can be emitted only to a specific space
area.
[0026]
According to the present invention, since the ultrasonic radiator is composed of a plurality of
ultrasonic transducers arranged closely and driven by the same signal, the alarm sound can be
generated only for a specific space area near the crossing. There is an effect that can be emitted.
[0027]
According to the present invention, since the ultrasonic radiator is attached to direct the sound
radiation direction to the passersby and vehicles using the crossing, the alarm sound is clearly
transmitted to the crossing user. At the same time, noises can be greatly reduced by transmitting
alarm sounds as much as possible to the residents around the level crossing.
[0028]
Brief description of the drawings
[0029]
FIG. 1 is a perspective view showing an installation state of a leveling superdirective speaker
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device according to Embodiment 1 of the present invention.
[0030]
FIG. 2 is a block diagram showing a configuration of a super-directional speaker device for level
crossing shown in FIG.
[0031]
3 is a pattern diagram showing directivity characteristics of the ultrasonic emitter shown in FIG.
[0032]
FIG. 4 is a schematic perspective view showing an installation state of a conventional alarm
speaker used for level crossing in a train or the like.
[0033]
FIG. 5 is a perspective view showing the appearance of a commercially available trumpet speaker.
[0034]
FIG. 6 is a pattern diagram showing directivity characteristics of a conventional speaker.
[0035]
Explanation of sign
[0036]
DESCRIPTION OF SYMBOLS 5 sound source, 6 modulators (modulation means), 6A ultrasonic
wave generation means, 6B modulation means, 7 amplifier (amplification means), 8 attachment
plate, 9 ultrasonic wave transducers, 11 posts, 100, 100A, 100B ultrasonic wave emitter , 102A,
102B, 105, 105A, 105B sound radiation space area, 120, 121 level crossing users, 122 vehicles,
130A, 130B roads.
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