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DESCRIPTION JPH1127774

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DESCRIPTION JPH1127774
[0001]
The present invention relates to an ultrasonic wave propagation path as a result of the non-linear
propagation characteristic of an acoustic wave when an ultrasonic wave amplitude-modulated by
an audible sound signal or the like by a parametric array effect is emitted to a medium (for
example, in the air). And a parametric speaker that utilizes a phenomenon in which a modulated
signal is demodulated as an audible sound.
[0002]
2. Description of the Related Art In the field of information communication by voice, controlling
the range and direction of voice transmission is one of the important issues. For example, at an
event site where a large number of people gather, it is necessary to transmit voice information to
a large number of people at one time. Communicating voices to people in an unnecessary range
is sufficient if it can be transmitted, leading to noise. In the case of a cash dispenser such as a
bank, the range is further limited, and it is necessary to transmit information to one user.
However, the audio is inherently omnidirectional, and to convey audio information only to a
specific range of people, use a speaker with a large horn or direct the volume of the normal
speaker while aiming at the target. It is common to lower it. Also, in recent years, there have been
proposed devices for transmitting voice information to a specific range using an active noise
control technique or a large dome-shaped reflector in part. These emit directional sound and
transmit voice information to a specific area.
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[0003]
However, in the case of a speaker having a large-sized horn, although it is possible to obtain an
audible sound field limited to a certain extent, sound leakage of low frequency components is
inevitable and the size of the device is increased. There is a problem of When the volume is
reduced using a normal speaker, sound leakage to the outside of the target range can not be
avoided, and by lowering the volume, the original information transmission effect may be lost. In
addition, when using active noise control technology or a large dome-shaped reflector, although
it has the effect of transmitting audio information in a limited range to some extent, the
boundaries are not clear because it originally emits audible sound If you want to set a narrow
range of audible sound field of different contents in close range or adjacent, it causes
inconvenience, and the equipment is also large and complicated, which increases the cost, and
once installed, change the position of the audible sound field Is difficult.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention
utilizes the parametric array effect of ultrasound. The parametric array effect is, for example, a
signal that is modulated along an ultrasonic wave propagation path as a result of the non-linear
propagation characteristic of the sound wave in the air when an ultrasonic wave amplitudemodulated with an audio range signal is emitted from a transducer such as an ultrasonic
transducer. Is a self-demodulation phenomenon, and since the demodulation locations are
distributed in an array in the traveling direction of the ultrasonic wave, the demodulated wave
has a sharp directivity in the traveling direction of the sound wave. In the present invention, an
ultrasonic transducer that emits an ultrasonic wave modulated by an unmodulated ultrasonic
wave or an audible sound signal, and an ellipsoidal surface or a paraboloid surface that reflects
ultrasonic waves emitted from an ultrasonic transducer is reflected. , A reflected wave detection
means for detecting a reflected wave of ultrasonic waves emitted through the reflection plate,
and a modulation for switching the presence or absence of modulation of ultrasonic waves given
to the reflected wave detection means and emitted from an ultrasonic transducer And switching
means.
[0005]
In addition, a plurality of ultrasonic transducers that emit ultrasonic waves in directions different
from each other with respect to the reflecting plate, and reflected wave detection means
corresponding to the respective ultrasonic transducers are provided, and predetermined
according to the respective ultrasonic transducers. Modulate the audible sound signal of
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[0006]
At the time of emission of ultrasonic waves modulated with an audible sound signal, an audible
sound demodulation range is indicated by a lighting device by the parametric array effect.
[0007]
[Operation] Therefore, when transmitting voice information to a small number of people or
individuals, it is possible to emit an audible sound wave having a sharp directivity by the
parametric array effect toward a specific area, and different contents of The audio information
can be set at a short distance in a spot manner or adjacent to each other.
Also, the reflected wave of the ultrasonic wave emitted through the reflection plate is detected,
and the presence or absence of modulation of the audible sound signal is switched with respect
to the ultrasonic wave. Therefore, when there is a person in the target area It is possible to
provide a quiet environment even in the region by modulating with a listening signal to transmit
a message and not performing modulation when there are no people.
[0008]
In addition, a plurality of ultrasonic transducers that emit ultrasonic waves in directions different
from each other with respect to the reflecting plate, and reflected wave detection means
corresponding to the respective ultrasonic transducers are provided, and predetermined
according to the respective ultrasonic transducers. Because it is modulated with an audible sound
signal of content, it is possible to convey messages of different content depending on where the
person is present.
For example, when a person approaches a close distance of a work displayed in a museum or an
art museum, a warning message can be transmitted.
[0009]
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Also, when a person is present, an audible sound demodulation range, ie, a range in which a
message is being sent is indicated by a lighting device such as a spotlight, so that a person who is
present there can visually confirm the range that can be heard. Can receive Therefore, in a
museum or an art museum, a person who wants to appreciate while receiving an explanation of
the displayed work, or a person who does not want an explanation can decide the viewing
position without being confused. At the same time, it is also possible to visually sense the
acoustic effect of parametric effects that are not normally experienced.
[0010]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory view showing the configuration of a speaker unit according to an
embodiment of the present invention. Reference numeral 1a denotes an ultrasonic transducer,
which emits ultrasonic waves which are amplitude-modulated with unmodulated ultrasonic
waves or audible sound signals into the air. Reference numeral 2 denotes a reflecting plate
composed of a paraboloid of revolution or an ellipsoid of revolution, and reflects the ultrasonic
wave emitted from the ultrasonic transducer 1 on its inner surface. This reflection plate
determines the direction of reflection of the ultrasonic wave emitted from the ultrasonic
transducer to determine the audible sound field, and if the shape is a paraboloid of revolution, its
focal point is determined at one point, and it rotates from the focal position If ultrasonic waves
are emitted to the inner surface of the paraboloid, the reflected waves travel in parallel with a
constant width without crossing each other. As shown, when the position of the ultrasonic
transducer is placed at a position away from the focal point F, a convergence point occurs in the
reflected wave, and the reflected wave once converged crosses and spreads. The convergence
point position in this case changes depending on the arrangement position of the ultrasonic
transducer, and the audible sound field can be adjusted by adjusting at a distance farther than
the focal point F with respect to the curved surface. That is, since the audible sound by the
parametric array effect is generated along the traveling direction of the ultrasonic wave, the
spread width of the ultrasonic wave at the position where the person exists is adjusted by
appropriately adjusting the convergence point of the reflected ultrasonic wave and generated.
The range in which the audible sound can be heard can be set. On the other hand, if the reflector
shape is a spheroidal surface, the focal point is determined at two points, and if an ultrasonic
wave is emitted from the first focal point position to the inner surface of the spheroid surface, the
reflected wave converges at the second focal point and then spreads. proceed. Either a
paraboloid or a spheroid may be adopted according to the target audible sound field, but in the
present embodiment, the paraboloid shape is used because of the high degree of freedom in
adjusting the convergence point. The case of using the reflection plate of the above will be
described. Reference numeral 3a denotes a narrow directivity ultrasonic sensor which is a
reflected wave detecting means, and the ultrasonic wave emitted from the ultrasonic transducer
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1 through the reflection plate 2 is reflected on the human body and reflected, and the ultrasonic
wave returning again is detected. The ultrasonic wave emitted through the reflector is usually
directed to the floor or wall, but a sound absorbing material is placed where the ultrasonic wave
strikes, and the ultrasonic wave sensor 3a reflects the reflected wave when no person is present.
Configure to not reach.
[0011]
Next, FIG. 2 is a block diagram showing a drive circuit of the embodiment of the present
invention. Reference numeral 4 denotes an oscillation circuit that oscillates a carrier wave (for
example, 40 KHz) of ultrasonic waves emitted from the ultrasonic transducer, 5a an audio signal
generation unit that generates a message to be transmitted to a person present in an audible
sound field, and 6a an oscillation circuit 4 It is a modulation unit that modulates the audio signal
output from the audio signal generation unit 5a on the output carrier wave. Reference numeral
7a denotes an amplification circuit that amplifies the output signal from the modulation unit 6a,
and drives the ultrasonic transducer 1a. Reference numeral 10a denotes an amplification circuit
that amplifies the output of the ultrasonic sensor 3a. 8 is an input / output device, and 9 is a
control unit. When the reflected wave (carrier frequency) from the human body is detected by
the narrow directivity ultrasonic sensor 3a, the control unit 9 modulates the voice signal to the
carrier wave by the modulation unit 6a while detecting, and the reflected wave is not detected.
After the predetermined time has elapsed (several tens of seconds to several minutes),
modulation of the audio signal is stopped and control is performed so that only the carrier wave
is output. Therefore, a message is generated as an audible sound only when a person is present
in a preset audible sound field, and only an ultrasonic wave that can not be perceived as a sound
is emitted when there is no person.
[0012]
Next, FIG. 3 shows an example in which the embodiment of the present invention is used in a
museum. FIG. 3 shows an example in which an ultrasonic transducer and a reflection plate are
installed in the vicinity of a ceiling, and the ultrasonic wave emitted from the ultrasonic
transducer 1a is reflected by the reflection plate 2 and then travels in the floor direction. Create
an audible sound field. The audible sound field is preset by adjusting the angle and position of
the ultrasonic transducer in accordance with the viewing position of the displayed work. A sound
absorbing material 11 such as polyurethane which absorbs an ultrasonic component is laid on
the floor surface so that a reflected wave does not reach the ultrasonic sensor 3a when no human
body exists in the set audible sound field. Therefore, if there is no one watching the exhibition, no
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sound is generated in the audible sound field, providing a quiet space. When a person
approaches for work appreciation, a part of the ultrasonic wave reflected by the human body
reaches the ultrasonic sensor 3a, and the explanation about the work stored in the audio signal
generation unit 5a is modulated as an audible sound. It occurs in the audible sound field. In this
case, the explanation will not be heard if you leave the set sound field. For example, "Please
watch the work within the range where this explanation can be heard. By adding a comment such
as "" to the explanatory voice, it also leads to preventing the approach of the exhibition work
from getting too close.
[0013]
Next, FIG. 4 is an explanatory view showing a speaker unit configuration of another embodiment
according to the present invention. By displacing the ultrasonic transducer 1b different from the
ultrasonic vibration 1a from the line connecting the focal point F and the center of the reflecting
plate 2 and arranging the ultrasonic transducer 1b at a position farther from the reflecting plate
than the focal point F A second audible sound field according to 1b, which is different from the
audible sound field due to the transducer 1a, is configured. The position of the second audible
sound field can be set by appropriately adjusting the position of the ultrasonic transducer 1b,
and the respective audible sound fields can be adjacent to each other or separated at a distance.
In other words, one reflective plate constitutes an independent audio sound field in different
directions, and by arranging a narrow directivity ultrasonic sensor for each independent audio
sound field, different voice messages are generated depending on the position of the person
standing up. I can tell. In this case, if the drive circuit is provided with a modulation part, an
audio signal generation part, and an amplification circuit according to the ultrasonic transducers
arranged as shown in FIG. 2, and an amplification circuit according to the arranged ultrasonic
sensors. Good.
[0014]
FIG. 5 shows an example in which a plurality of audible sound fields are configured and used, for
example, in a museum. In the case of an exhibition work that is prohibited to touch, an audible
sound field B is set near the work, and a warning message indicating that it is within the
prohibited range is given. Alternatively, in the case of a work that does not interfere with
approaching and touching, it is possible to give an appropriate explanation according to the
viewing position. In addition, when giving a warning message, you may comprise so that a
warning message may always be flowed instead of giving a warning, after detecting the reflected
wave by a human body with an ultrasonic sensor.
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[0015]
Next, FIG. 6 shows another embodiment of the present invention. Reference numeral 12a denotes
a lighting device such as a spotlight, which is set so that the set audible sound field and the range
of the audible sound field with respect to the floor surface are spot-likely illuminated by the
lighting device. The illumination device 12a illuminates the audible sound field range A, and
visually guides the person watching the work the range where the explanation about the work
can be heard. Also, the illumination device 12b is installed to illuminate the audible sound field
range B shown in FIG. 5, and when the viewer is approaching the work too much, in addition to
the warning message constantly flowing, the ultrasonic sensor detects the human body It
illuminates the color spotlight to detect and give attention.
[0016]
As described above, according to the present invention, an ultrasonic vibrator comprising an
ultrasonic transducer for emitting an ultrasonic wave modulated by an unmodulated ultrasonic
wave or an audible sound signal, and an ellipsoid of revolution or a paraboloid of revolution is
used. A reflection plate for reflecting the ultrasonic wave emitted from the transducer, a reflected
wave detection means for detecting a reflected wave of the ultrasonic wave emitted through the
reflection plate, and a reflected wave detection means, which is emitted from the ultrasonic
transducer Modulation of the ultrasonic wave.
[0017]
This makes it possible to create an audible sound field that generates an audible sound only in a
specific three-dimensional space region according to the size of the reflector, and requires audio
information without destroying the surrounding quiet environment. It can only be transmitted to
people.
Moreover, the presence or absence of a human body in the audible sound field can be detected
only by the speaker without providing a human body detection sensor or the like, and audio
information can be flowed only when there is a human being. Therefore, the person who receives
the audio information suddenly hears the audio information filled in the specific space at the
place where it was a quiet space, so that the effect of hearing the information with interest in a
fresh sense can be obtained.
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[0018]
Further, in the present invention, a plurality of ultrasonic transducers that emit ultrasonic waves
in directions different from each other with respect to the reflection plate, and reflected wave
detection means corresponding to the respective ultrasonic transducers are provided. Since the
predetermined audible sound signal is modulated accordingly, a plurality of audible sound fields
can be provided adjacent to each other, and voice messages of different contents can be
streamed to each of the audible sound fields. Therefore, when installed in a museum or an art
museum, attention can be drawn to the approach to the display work, or a work guide
corresponding to the position to be watched can be provided. Furthermore, since the direction
and position of the audible sound field can be changed only by adjusting the angle of the
ultrasonic transducer with respect to the reflection plate, the time for installation can be reduced
and the versatility of the device can be enhanced.
[0019]
In addition, since the audible sound demodulation range by the parametric array effect, that is,
the audible sound field is indicated by an illumination device such as a spotlight when emitting
ultrasonic waves modulated with an audible sound signal, a person present in the audible sound
field can You can listen while visually confirming the range that can be heard, and you can feel
the strange acoustic sensation brought about by the parametric effect also from the visual aspect.
On the other hand, a person who has entered the audible sound field but does not need voice
information can smoothly move to a quiet space where no voice information flows. Furthermore,
since the brightness and color of light can be changed according to the contents of audio
information flowing in the audible sound field, the audio information can be transmitted more
effectively when giving a warning or a warning.
[0020]
Brief description of the drawings
[0021]
1 is an explanatory view of the speaker portion of the embodiment of the present invention.
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[0022]
2 is a block diagram showing a drive circuit of the embodiment of the present invention.
[0023]
3 is an explanatory view showing a use form of the embodiment of the present invention.
[0024]
4 is an explanatory view of the speaker portion of the embodiment of the present invention.
[0025]
5 is an explanatory view showing a use form of the embodiment of the present invention.
[0026]
6 is an explanatory view showing a use form of the embodiment of the present invention.
[0027]
Explanation of sign
[0028]
1a, 1b Ultrasonic Transducer 2 Reflective Plate 3a, 3b Ultrasonic Wave Sensor 6a, 6b as
Reflected Wave Detection Means Modulator 9 Control Unit 11 Sound Absorbing Material 12a,
12b Illumination Device
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