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JP2012204979

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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
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DESCRIPTION JP2012204979
An object of the present invention is to provide a sense of synchronization between vision and
hearing even when the display surface and the sound emission surface are provided at different
positions. An acoustic system (1) includes an electrostatic speaker (10) and a reflector (20), and
the reflector reflects the acoustic wave emitted from the electrostatic speaker (a display surface
(display area RD). And the reflector and the electrostatic speaker are placed at a position and an
orientation where the acoustic wave reflected by the display surface reaches the viewer (viewer
U). [Selected figure] Figure 1
Sound system
[0001]
The present invention relates to acoustic systems.
[0002]
There is known an acoustic device such as a speaker array or a planar speaker that emits
acoustic waves having sharp directivity (see Patent Document 1).
It is also performed to cause an acoustic wave to reach only a predetermined area (localize a
sound image) using such an acoustic device. According to the technology described in Patent
Document 1, when the user stands at a predetermined place, it is possible to give the user a
feeling that the acoustic wave reaches from only a specific direction when viewed from that
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place.
[0003]
Japanese Patent Application Laid-Open No. 10-234100
[0004]
However, in the technique of Patent Document 1, only the hearing affects the user, and the vision
is not included.
For example, there is no idea that information related to vision, such as the direction in which the
printed matter drawn on the wall surface exists or the position at which the screen for displaying
the image is provided, is associated with the display object or the image and a predetermined
sound effect . As a method of associating visual information and auditory information, it is also
conceivable to provide a directional speaker near the screen of the video display device. In this
way, the sense that the direction in which the sound comes (hearing information) and the
direction in which the image (light) reaches (visual information) matches the user (hereinafter
referred to as a sense of tune) Can be given). However, particularly in the outdoors, there is not
always a space where the audio device can be installed near the display object or the video
screen. According to the present invention, even when the visual information source (display
surface) and the auditory information source (sound emission surface) are installed at different
positions, an acoustic sense that can provide sense of visual and auditory sense can be provided.
It aims to provide a system.
[0005]
In one aspect, the present invention includes an electrostatic speaker, and a reflector having a
display surface and reflecting an acoustic wave emitted from the electrostatic speaker on the
display surface, The reflector provides an acoustic system characterized in that the reflector is
positioned and oriented such that the acoustic wave reflected by the display surface reaches only
a defined area. In a preferred aspect, the electrostatic speaker includes a direction adjustment
unit that adjusts the direction of a sound emission surface of an acoustic wave, a region
designation unit that designates the region, and display surface state acquisition that acquires the
position and orientation of the display surface. And a state control unit configured to control the
mechanism in accordance with the acquired position and orientation of the display surface and
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the designated area. In another preferred embodiment, the electrostatic speaker includes a first
electrostatic speaker and a second electrostatic speaker provided at different positions, and the
reflector has display surfaces provided at different positions. A first reflector and a second
reflector, any one of the first reflector and the second reflector being movable, the first reflector
and the second reflector In accordance with the positional relationship between the first
electrostatic speaker and the second electrostatic speaker so that the reflected sound of either
one of the acoustic waves emitted from the first electrostatic speaker and the second electrostatic
speaker reaches the viewer; For each of the electrostatic speaker and the second electrostatic
speaker, at least one of the installation position and the sound emission surface is determined. In
still another preferred embodiment, the acoustic system further includes an intermediate
reflector that guides an acoustic wave emitted from the electrostatic speaker to reach the
reflector.
[0006]
According to the present invention, it is possible to give the user in the area set depending on the
distance from the display a sense of synchronization between vision and hearing.
[0007]
The figure showing the outline of sound system 1.
The figure which shows the transmission path of an acoustic wave. The figure showing the
outline of sound system 2 (the 1). The figure showing the outline of sound system 2 (the 2). The
figure showing the outline of sound system 3. FIG. 6 is a diagram showing the function of the
projection device 30. The figure showing the function of the electrostatic speaker 11. FIG. The
figure showing the outline of sound system 4. The figure showing the acoustic system 5 typically.
The figure showing the outline of sound system 6. The figure showing the outline of sound
system 7. FIG.
[0008]
<Example> FIG. 1 is an external appearance perspective view showing an outline of the acoustic
system 1. As shown in the figure, the sound system 1 is an image (characters) for the viewer U
who is in a space constituted by a ceiling C (XY plane), a floor F (XY plane), and a wall W (ZY
plane). It also includes information etc., and in short is for providing visual information) and
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sound (information appealing to hearing). The electrostatic speaker 10 is attached to the ceiling
C via the support P1. The reflector 20 is fixed to the wall W. The electrostatic speaker 10 is a socalled electrostatic speaker. Specifically, in the electrostatic speaker 10, a pair of opposing flat
electrodes provided with holes for sound emission and a sheet-like diaphragm that vibrates
according to the potential difference between the electrodes are disposed between the electrodes.
By placing a potential difference between the electrodes according to the input acoustic signal,
the vibration corresponding to the acoustic signal is generated on the diaphragm, and the
generated vibration is emitted as an acoustic wave to the outside through the hole. . In the
electrostatic speaker 10, since the sheet-like diaphragm is driven on the entire surface as the
vibrating member, the generated acoustic wave has sharp directional characteristics (straight
line) in a plane wave shape. Specifically, this acoustic wave has a peak of sound pressure in a
direction perpendicular to the sound emission surface S (diaphragm surface, electrode surface),
and the sound pressure is greatly reduced in the direction having an angle from the vertical
direction. . Therefore, the sound leakage to the surroundings is small, and the incident and
reflection are clear. Strictly speaking, although finite sound pressure levels exist in directions
other than vertical from the sound emission surface S, their audibility has little influence, and
when propagating in a direction substantially perpendicular to the sound emission surface S
substantially I can see. Therefore, in the following, for convenience of explanation, it is assumed
that an acoustic beam of the same size as the emitting surface S is emitted in a direction
perpendicular to the emitting surface S, and the directivity and sound pressure level propagate
without change. Also, it is assumed that the acoustic beam diameter does not change along with
propagation unless otherwise specified. The structure of the electrostatic speaker 10 may be
other than that described above. For example, only one electrode may be formed, or a plurality of
diaphragms may be arranged. The point is that it is sufficient to have a flat electrode to be a
sound emitting surface and a vibrating member that vibrates by electrostatic force.
[0009]
As shown in the figure, the reflector 20 has a display area RD of a material that reflects the
acoustic wave emitted from the electrostatic speaker 10, and the display area RD is an object to
be viewed by the viewer U. Display objects (pictures, characters, photographs, etc.) are drawn and
formed. The reflector 20 is, for example, a poster obtained by printing a photograph for product
promotion on glossy paper. It is preferable that the material of the display area RD be a material
having a smooth surface, which is difficult to absorb and diffuse acoustic waves (= easy to
specularly reflect). The wall W and the reflector 20 may be formed of separate materials or may
be the same material (that is, integrated with the wall W). In the latter case, the picture drawn on
the display area RD of the wall W using a pigment or the like is the reflector 20 as a display. That
is, the display object may be anything that acts on the viewer U's vision. The sound emitting
surface of the electrostatic speaker 10 is directed to the reflector 20 with reference to the
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installation position. More specifically, the position of the electrostatic speaker 10 and the
direction of the sound emission surface S are fixed so that the emitted acoustic wave just reaches
the display area RD. It is preferable that all the acoustic beams that have reached the display area
RD be within the display area RD. More preferably, the arrival area of the acoustic wave and the
display area RD are as close as possible. However, not all the acoustic waves reaching the wall W
need to be in the display area RD, as long as they are in the vicinity of the display area RD. In
short, the position and the orientation of the electrostatic speaker 10 may be determined to give
the viewer U a feeling that the acoustic wave reflected by the display area RD is approximately
reached from the direction of the display area RD. Now, it is assumed that the viewer U stands in
the audible area RL in the floor F and is in a position where the reflector 20 can be recognized.
The above-mentioned sound signal is preferably sound information related to the display object
of the display area RD, and is, for example, sound announcement data for explaining the display
object.
[0010]
FIG. 2 shows a cross section in the direction perpendicular to the Y direction of the space in
which the acoustic system 1 is installed, and is a view showing the transmission path of the
acoustic wave. Since the acoustic wave emitted from the sound emission surface S is directed
toward the wall W, the direct sound from the electrostatic speaker 10 does not reach the user at
any position on the floor F. The acoustic wave that has reached the display area RD is reflected
there and propagates toward the floor F while maintaining directivity. Then, the height of the
head (ear) of the user viewer U in the audible area RL is reached. The viewer U who is in the
audible area RL recognizes the presence of the acoustic wave and its incoming direction. As
described above, if the installation position of the electrostatic speaker 10 and the orientation of
the sound emitting surface S, the position of the reflector 20 and the orientation of the display
region RD are determined, the audible region RL is determined. Conversely, by setting the desired
audible area RL, the installation position of the electrostatic speaker 10 and the orientation of the
sound emitting surface S, the position of the reflector 20, and the orientation of the display area
RD can be determined. In short, the acoustic system 1 is a system including an electrostatic
speaker, and a reflector having a display surface and reflecting an acoustic wave emitted from
the electrostatic speaker on the display surface, the electrostatic speaker The reflector may be
positioned and oriented so that the acoustic wave reflected by the display surface reaches only a
desired area.
[0011]
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Thus, according to the acoustic system 1, when the viewer U is located in the audible area RL, the
sound comes from the same direction as the direction of the display object (reflector 20) visible
from the location Give the viewer U a sense (tuned sense). On the other hand, when the viewer U
is outside the audible area RL (in the figure, the side closer to the wall W and the side farther
than the wall W with respect to the audible area RL), the sound emitted from the electrostatic
speaker 10 is It does not reach the viewer U, and only the displayed object can be viewed. As
described above, according to the sound system 1, when the display object and the sound device
are installed at a separated position, the image can be displayed only for the user within a
predetermined distance range from the position of the reflector 20 (wall W) A sense of
synchrony of sound is given. Here, consider a case where a certain person moves from the other
place to the audible area RL. Regardless of the direction of the person's face (that is, even if the
display object is not stopped at that time), the person hears the sound emitted from the
electrostatic speaker 10 and the sound Recognize what you hear from a particular direction.
When the person pays attention to the direction and turns his face to that direction, the display
object is at the end of the line of sight, so that the user feels as if the sound is emitted from the
display object. As a result, the person can be made to recognize the content of the sound and the
content of the display in association with each other. In the sound system 1, for example, if the
display object is an advertisement poster and the sound content is an explanation announcement
of the product, an advertisement effect is expected to be increased by simultaneously appealing
to both the user's sight and hearing. It should be noted that the acoustic wave reaching the floor
F is reflected there and repeated reflections by the ceiling C and the wall on the opposite side
(not shown) to prevent reaching the viewer U outside the audible area RL finally Preferably, the
ceiling C and the opposite wall are provided with sound absorbing means. For example, the
sound absorbing material may be formed on the surface of the wall surface.
[0012]
Second Embodiment FIG. 3 and FIG. 4 are diagrams showing an overview of the acoustic system
2. The sound system 2 is an example in which the sound system according to the present
invention is installed on a platform of a train station. In the acoustic system 2, a non-closed
space, an electrostatic speaker 10-1 and an electrostatic speaker 10-2 provided at different
positions instead of the electrostatic speaker 10, a reflector of acoustic waves The acoustic
system 1 differs from the acoustic system 1 in that the vehicle 52 (see FIG. 4) is used as a
candidate other than the reflector 20. FIG. 3 shows a state in which the viewer U is waiting for a
train on the platform 50. In the acoustic system 2, a reflector 20 is provided on the other side of
the platform 50 across the line 51. The reflector 20 is at a position where the viewer U who waits
for the train can see. The electrostatic speaker 10-1 is fixed to the ceiling C of the station
building, and the sound emission surface S faces the direction (downward) of the signboard B.
The electrostatic speaker 10-2 is provided under the platform 50 and beside the line 51, and the
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sound emission surface S thereof is directed in the direction of the signboard B (upward). In the
figure, the acoustic wave emitted from the electrostatic speaker 10-1 reaches above the reflector
20 of the signboard B and propagates as it is in a state where the train does not enter. Therefore,
in this state, the acoustic wave from the electrostatic speaker 10-1 does not reach the viewer U.
On the other hand, the electrostatic speaker 10-2 is supported by the platform P2 so that the
emitted acoustic wave is reflected and propagated upward in the display area RD and is
positioned and oriented so as to reach the viewer U. It is fixed at 50. As described above, when
the train is not connected, only the sound emitted from the electrostatic speaker 10-2 reaches
the viewer U in the audible area RL. It is possible to give the feeling that the sound of the speaker
10-2 is generated from the display area RD.
[0013]
FIG. 4 shows a state in which the vehicle 52 has entered the home in the sound system 2. In this
situation, the acoustic wave emitted from the electrostatic speaker 10-2 repeatedly attenuates by
reflecting between the side surface of the vehicle 52 and the side surface of the platform 50.
Although part of the acoustic wave that has repeatedly reflected may propagate upward through
the gap between the vehicle 52 and the platform 50, the sound pressure level is very small even
if it may reach the display area RD. It will be negligible. That is, when the vehicle 52 is present
between the signboard B and the platform 50, the sound from the electrostatic speaker 10-2
does not substantially reach the viewer U. On the other hand, the acoustic wave emitted from the
electrostatic speaker 10-1 reaches the side surface of the vehicle 52 before reaching the
signboard B. The vehicle 52 is made of metal and is provided with glass doors and windows. The
surfaces of the main body, the door, and the window are almost flat and reflect acoustic waves
without substantially impairing the directivity. Accordingly, the acoustic wave emitted from the
electrostatic speaker 10-1 is reflected by the side surface of the vehicle 52, propagates
downward (in the direction in which the viewer U is present), and reaches the ear of the viewer
U. Thus, when the vehicle 52 is present, the sound from the electrostatic speaker 10-1 is
delivered to the side of the vehicle 52 to the user in the audible area RL, and this sound is
generated as if from the side of the vehicle 52. It can give you a sense of feeling. The usage
method of the acoustic system 2 is as follows, for example. The poster on which the
advertisement is printed is displayed in the display area RD, and the electrostatic speaker 10-2
makes the voice related to the advertisement flow. Then, an advertising photograph different in
content from the reflector 20 is attached to the side surface of the vehicle 52, and a voice related
to the advertising photograph is made to flow from the electrostatic speaker 10-1. In this way,
while the viewer U is waiting for the train in the audible area RL, when the train comes while
listening to only the voice related to the contents of the display area RD from the direction of the
display area RD, You can hear the sound of the other content that can be heard from the side
part. That is, in the case where there are two reflectors and one is movable, one of the sounds
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flowing from the two speakers must surely reach the viewer U, and moreover, when the sound
comes, the direction in which the viewer U feels always The viewer U can be made to recognize
the display related to the sound. Furthermore, in order to prevent two sounds from reaching the
viewer U, it is determined without performing control such as switching on / off of the switches
of the electrostatic speakers 10-1 and 10-2 in accordance with the position of the vehicle. It is
possible to always hear only one of the users of the designated area RL regardless of the
presence or absence of the train.
[0014]
The electrostatic speakers 10-1 and 10- may be arranged such that the audible area for the
acoustic wave emitted from the electrostatic speaker 10-1 matches the audible area for the
acoustic wave emitted from the electrostatic speaker 10-2. 2 may be disposed, a portion of each
audible region may be coincident, or two regions may be completely different (no overlap). Also,
although this example shows an example using two sets of acoustic devices configured with one
electrostatic speaker and one reflector, in the present invention, three or more sets of
electrostatic speakers and reflectors are used. Of course, it may be provided. The sound system of
the present invention may be applied not only to trains but also to stops of buses or other means
of transportation.
[0015]
Third Embodiment FIG. 5 is a diagram showing an outline of the sound system 3. The acoustic
system 3 differs from the acoustic system 1 and the acoustic system 2 in that a reflector such as
a poster or the like is not used in a partial area of the wall W as a reflector but a reflector of
acoustic waves is provided on the wall W. The image is projected on the image display surface V
(for example, the image display surface V may be integrally formed with the wall W) which
functions as an image, and the sense that sound comes from the image display surface V is
viewed within a predetermined area It is a point given only to the person U. Another point is to
use the electrostatic speaker 11 fixed to the ceiling C by the support P4 which has a rotational
drive mechanism such as a motor and can fix the direction of the sound emitting surface in an
arbitrary direction. It is the same as the acoustic system 1 in that the acoustic wave emitted from
the electrostatic speaker 11 is transmitted only to the user who is in the audible area RL.
[0016]
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The projector 30 is a projector such as a projector, and has a function of projecting projected
light according to data from the input image toward the wall W. The projection device 30 is fixed
by the table T provided on the floor F and the support P3. The projector 30 has the following
functions in addition to the function as a normal projector. FIG. 6 is a diagram showing the
function of the projection device 30. As shown in FIG. The projection apparatus 30 includes an
angle control unit 302, a communication unit 303, an image input unit 304, a projection unit
305, a display position determination unit 306, and a state acquisition unit 307. The video input
unit 304 inputs a video signal to be projected. The angle control unit 302 is constituted by a
drive mechanism such as a sensor or a motor, and controls the direction of the emitted light and
the size of the projection image (diameter of the light beam (diaphragm)). The projection unit
305 includes an image processing processor, an LED (Light Emitting Diode), and the like,
generates light based on the video signal, and emits the light toward the video display surface V.
The state acquisition unit 307 includes a sensor and an input device, and calculates the distance
to the video display surface V and the angle of the video display surface V with respect to the
light beam. The display position determination unit 306 detects the position of the image
displayed on the image display surface V (or the size of the image to be additionally projected)
based on the information acquired by the state acquisition unit 307 and the information on the
width and angle of the light beam. Decide. The communication unit 303 wirelessly communicates
the information determined by the display position determination unit 306 to the electrostatic
speaker 10.
[0017]
FIG. 7 is a diagram showing the function of the electrostatic speaker 11. The electrostatic
speaker 11 includes a posture control unit 112, an acoustic generation unit 113, a display
surface state acquisition unit 114, a storage unit 115, an area designation unit 116, and a
direction adjustment unit 117. The sound generation unit 113 generates a vibration
corresponding to the input sound signal to emit an acoustic wave. The area designation unit 116
sets an audible area RL. The direction adjustment unit 117 includes one or more rotation shafts
embedded in the support P4, a rotating body rotating around each rotation axis, and a drive
mechanism such as the above-described motor for driving the rotation body (all illustrated
Realized by changing the direction of the sound emitting surface S. Specifically, the sound
generation unit 113 includes an electrode, a diaphragm, a voltage control circuit, a signal
processor, and the like, and generates an acoustic wave from an input sound signal. The area
designation unit 116 has an input device such as a keyboard, and receives an input of the
position (or additionally, the size of the audible area RL) of the audible area RL desired by the
administrator of the sound system 3. Thereby, the audible area RL can be changed in the sound
system 3. Alternatively, the position where the user is present may be specified by providing a
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human sensor or analyzing an image captured by a camera, and a predetermined size range
including this position may be set as the audible area RL. In this way, even if the user moves, the
audible area RL can be changed according to the position which changes momentarily. The
storage unit 115 stores information on the installation position of the electrostatic speaker 11
with respect to the wall W and the position of the audible area RL. The display surface state
acquisition unit 114 includes a communication module for performing wireless communication
with the projection device 30, and acquires information on the position and orientation (or size in
addition to this) of the video display surface V from the projection device 30. Posture control unit
112 includes information on the position and orientation of display area RD acquired from
projection apparatus 30, the installation position of electrostatic speaker 11 stored in storage
unit 115, and the audible area RL set by area designation unit 116. The direction of the sound
emitting surface S is determined such that the reflected acoustic wave from the display area RD
reaches the viewer U in the audible area RL based on the information on the position of Drive the
tool P4.
[0018]
According to the sound system 3, even if the display object is not a printed matter such as an
advertisement poster in which the display position is fixed but the projection image whose
display position can be changed, the sound according to the displayed position is sounded The
direction of the sound emitting surface S is changed so that the waves reach. As a result, the
visual and auditory coordination is maintained regardless of the display position.
[0019]
Fourth Embodiment FIG. 8 is a diagram illustrating the function of the sound system 4. The
acoustic system 4 is different from the acoustic system 3 in that the liquid crystal display 21 is
used as a reflector and the electrostatic speaker 11 is used instead of the electrostatic speaker
11. The liquid crystal display 21 includes an input unit for inputting a video signal, a display
panel (video display surface V) configured of liquid crystal, polarization filter, etc. and reflecting
acoustic waves, a power supply, and generates a control signal according to an input video signal
An image processing processor and a drive circuit (all not shown) for supplying control signals to
the display panel are provided, whereby an image display function is realized. That is, an image is
displayed on the video display surface V based on the input image signal. The image display
surface V reflects the acoustic wave from the electrostatic speaker 12. In addition, the liquid
crystal display 21 is supported by the support members 211, 212, and 213 so that the position
(height) and the orientation of the image display surface V can be fixed at any position.
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Specifically, the liquid crystal display 21 has a slide mechanism for fixing the support member
212 so as to be vertically movable and a rotation mechanism for rotatably fixing the support
member 211 to the support member 212 vertically and horizontally. Furthermore, a motor for
driving the slide mechanism and the rotation mechanism and a control circuit thereof may be
provided (all not shown). Furthermore, the liquid crystal display 21 has a detection mechanism
(not shown) such as a gyro sensor or a gravity sensor, and realizes a function of acquiring
information on the position and orientation (attitude) of the image display surface V. In addition,
the liquid crystal display 21 includes a communication module such as an infrared
communication module conforming to the IrDA standard or a wireless communication module
conforming to the IEEE 802.11 standard, and has a function of exchanging information with the
electrostatic speaker 12 by wireless communication. Have. Information on the position and
orientation (posture) of the video display surface V detected by the detection mechanism is
transmitted to the electrostatic speaker 12 through the wireless communication module.
[0020]
The electrostatic speaker 12 has a moving mechanism for moving the electrostatic speaker 12 in
the X direction along the rail Ra provided on the ceiling C in addition to the mechanism for freely
changing the direction of the sound emitting surface S. It differs from the electric speaker 11.
Furthermore, the electrostatic speaker 12 differs from the electrostatic speaker 11 in that it has a
wireless communication function such as a wireless communication module and receives
information on the position and orientation (attitude) of the video display surface V transmitted
from the liquid crystal display 21. It is a point having a function. The electrostatic speaker 12
reflects the acoustic wave on the video display surface V based on the received information on
the position and orientation of the video display surface V and the information on the position of
the designated audible region RL, and the user in the audible region RL The position of the sound
emission surface S and / or the position in the X direction that can be reached is determined, and
the support P4 and / or the moving mechanism is driven based on the result. As a result, for the
viewer U in the audible area RL, the visual information received from the liquid crystal display 21
and the auditory information provided from the electrostatic speaker 12 can be synchronized.
[0021]
In the above description, the state (position and orientation) of the liquid crystal display 21 is
determined first, and the electrostatic speaker 12 changes its position and orientation
accordingly, but the position of the electrostatic speaker 12 is first reversed. The orientation may
be determined, this information may be transmitted from the electrostatic speaker 12 to the
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liquid crystal display 21, and the position and orientation of the video display surface V may be
changed based on the information received by the liquid crystal display 21. In short, when the
audible area RL is designated, the acoustic system 4 cooperates with the electrostatic speaker 12
and the liquid crystal display 21 to change the position and / or orientation of each to the
audible area RL. It suffices to have a function of causing an acoustic wave to reach. Further,
instead of the liquid crystal display 21, an image display device using a material other than liquid
crystal may be used. The point is that the acoustic wave should be reflected on the image display
surface.
[0022]
FIG. 9 is a diagram schematically showing the sound system 5. The sound system 5 includes a
plurality of electrostatic speakers 12 (12-1, 12-2, 12-3), a plurality of liquid crystal displays 21
(21-1, 21-2), a control server 40, and a network 60 connecting these. And consists of Each
electrostatic speaker 12 and each liquid crystal display 21 are provided at different positions.
The difference between the sound system 5 and the sound system 4 is that one electrostatic
speaker 12 and one liquid crystal display 21 cooperate to provide a plurality of statics in order to
provide a tuning state to the user in the audible area RL. One of the electronic speakers 12 and
any one of the plurality of liquid crystal displays 21 are appropriately combined and controlled.
The control server 40 is responsible for controlling this combination and the position and
orientation.
[0023]
Specifically, the control server 40 includes a control unit 401, an input unit 402, a storage unit
404, and a communication unit 403. The control unit 401 has a state change unit 4012 and a
device selection unit 4011. The input unit 402 is an input device such as a keyboard that inputs
the position (or the size or shape of the audible area RL in addition to the position) of the audible
area RL that the user of the control server wants to realize. The communication unit 403 is a
communication interface for communicating with each electrostatic speaker 12 and each liquid
crystal display 21. The storage unit 404 stores, for each electrostatic speaker 12 and each liquid
crystal display 21, information on whether or not the installation position, orientation, and
position can be changed, and, if possible, the movable range. These information may be grasped
by the control server 40, or may be acquired from the electrostatic speaker 12 and each liquid
crystal display 21 and updated to the latest information as needed. The device selection unit
4011 is based on the information on the audible area RL designated from the input unit 402 and
the information on the position and / or orientation of the electrostatic speaker 12 and the liquid
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crystal display 21 stored in the storage unit 404. Then, it is determined which electrostatic
speaker 12 and which liquid crystal display 21 should be combined in order to realize the tuning
state in the designated audible area RL or the area closest to the audible area RL. State change
unit 4012 determines whether or not the determined state (at least one of position and
orientation) of electrostatic speaker 12 and liquid crystal display 21 needs to be changed, and if
necessary, the position or direction to be changed. The amount of change is calculated, and an
instruction is generated to operate the drive mechanism for changing the position and
orientation of the electrostatic speaker 12 and the liquid crystal display 21. This command is
transmitted to the electrostatic speaker 12 and the liquid crystal display 21 via the
communication unit 403. The control server 40 may transmit an instruction to turn off the
power to the electrostatic speaker 12 and the liquid crystal display 21 which are not related to
the operation. The control server 40 described above may also have the function of one
electrostatic speaker 12 or liquid crystal display 21. <Modification>
[0024]
In the above embodiments, the acoustic wave is delivered to the desired audible area RL by one
reflection, but the audible area RL may be reached through multiple (two or more) reflections.
FIG. 10 is an example of the acoustic system 6 reflected once on the ceiling and the wall. In this
case, it is not necessary to draw a display on the ceiling that reflects first. It is sufficient that the
display object exists in the direction substantially the same as the direction in which the viewer U
feels that the sound comes. In short, one or more intermediate reflectors that reflect the acoustic
wave may be provided so as to guide the acoustic wave emitted from the electrostatic speaker to
the display and to enter the reflector at the desired angle. By providing the intermediate reflector
with a drive mechanism for changing the position and the orientation, the setting of the audible
area RL can be changed even when the position and the orientation of the electrostatic speaker
are fixed.
[0025]
In the electrostatic speakers 10, 11, 12, in addition to the sound emission direction of the
acoustic wave (acoustic beam), a mechanism for changing the cross-sectional area of the acoustic
beam may be further provided. For example, it is a mechanism that controls to change the
effective sound emission area of the sound emission surface S so as to match the size of the
image display surface V or the size of the audible region RL to the display region RD. Specifically,
in the electrostatic speakers 10, 11 and 12, the diaphragm is not made up of a single sheet (film),
but a plurality of diaphragms are arranged side by side, and electrostatic force applied to each
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diaphragm Add a mechanism to control independently. Then, control is performed such that only
the diaphragm at the center is operated when it is desired to squeeze the acoustic beam, and
when the acoustic beam is desired to be spread, the outer diaphragm is also operated.
[0026]
If the electrostatic speaker has such a characteristic that the cross-sectional area of the acoustic
beam spreads at a constant rate as it propagates, this characteristic may be actively used. FIG. 11
is a top view of the acoustic system 7 configured using the electrostatic speaker 13 instead of the
electrostatic speaker 10 in the acoustic system 1. The electrostatic speaker 13 differs from the
electrostatic speaker 10 only in that the spread angle of the acoustic beam is not zero and has a
finite value. Specifically, the emitted acoustic wave spreads and propagates at a spread angle θ
in the Y direction and the Z direction. In addition, it is assumed that only the user at
approximately the front position can clearly see the display object on the reflector 20 clearly.
The sound emitting surface S is set at a distance L1 in the X direction from the reflector 20, and
the audible area RL is formed between the distance L2 in the X direction from the reflector 20 to
L2 + W (RL). The width (length in the Y direction) of the sound emission surface S and the width
of the display area RD are W (S) and W (RD), respectively, and W (S) <W (RD). That is, the size of
the display area RD is larger than the size of the sound emission surface S. In this situation, if θ
is zero, the acoustic wave reflected from the reflector 20 will reach the audible area RL. Since the
width W (RD) of the display area is W (RD)> W (RL), for example, the user in the area RS can
visually recognize the displayed object but can not recognize the acoustic wave. On the other
hand, when the electrostatic speaker 13 is used, the audible region is a trapezoidal region RLnew
surrounded by W1 (RLnew) and W2 (RLnew) because the acoustic beam is spread. That is, the
area in which the tuning effect can be provided is vast. Thus, even when the size (W (S)) of the
sound emitting surface s is different from the size (W (RD)) of the display object, the directivity
(degree of beam spread) of the emitted acoustic wave By adjusting (.theta.) And the installation
position (L1) of the electrostatic speaker, the position and size of the audible area can be made
close to the position and size of the visible area.
[0027]
In the present invention, any device may be responsible for specifying the position and
orientation of the electrostatic speaker, the position and orientation of the reflector of the
acoustic wave, and the audible area RL. The sound systems 3 to 7 basically include an
electrostatic speaker and a reflector provided with a display surface and reflecting an acoustic
wave emitted from the electrostatic speaker on the display surface, and the electrostatic speaker
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and the reflection The body is a system having a function of positioning and directing the
acoustic wave reflected by the display surface so that the acoustic wave reflected by the display
surface only reaches a defined area, and a mechanism for adjusting the direction of the sound
emission surface of the acoustic wave. And means for specifying the area, means for acquiring
the position and orientation of the display surface, and means for controlling the mechanism
according to the acquired position and orientation of the display surface and the designated area.
As long as you have
[0028]
The electrostatic speakers 11 and 12 acquire the positions of the reflector 20 and the liquid
crystal display 21 in addition to the above-described aspect using the wireless communication,
for example, the electrostatic speakers 11 and 12 are provided with a camera function to analyze
imaging data Alternatively, a reflector that may be a target to which an acoustic wave is to be
applied or a partial region of the reflector may be identified, or if there are a plurality of
identified regions, one of them may be selected. At this time, for example, a predetermined figure,
a QR code or the like is drawn as a marker for alignment on a display (including an image), and
data captured by this camera is subjected to image analysis to extract a marker or the like. The
position or orientation of the reflector may be specified based on the information represented by
the marker or the like. In short, the sound system only needs to have a function capable of
grasping the relative position of the electrostatic speaker with respect to the display surface (=
reflection surface).
[0029]
In each of the above embodiments, the direction of the sound emitting surface S is set so that the
trajectory of the acoustic beam is perpendicular to the Y direction for convenience of
explanation, but the present invention is not limited to this. If it is an arrangement to reach, for
example, the incident direction to the reflector such as a wall or a ceiling is arbitrary. In addition,
the reflector does not have to be a flat surface, and may be a curved surface. In this case,
although the shape and directivity of the acoustic beam may change due to reflection, the
acoustic wave emitted from the electrostatic speaker and reflected by the reflector having the
display surface is arranged to reach only the predetermined audible area RL. It should just be.
[0030]
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The speaker used in the present invention is not limited to an electrostatic speaker, and may be a
speaker having sharp directivity (straight line). For example, it is the speaker array which
combined the ultrasonic speaker and the speaker without directivity. In short, the direct sound
from the speaker does not substantially reach the viewer, and only the sound reflected on the
display surface or in the vicinity thereof reaches only the predetermined audible area RL, as a
result, the tuning effect is given to the viewer in the audible area RL. Any system configuration is
acceptable. Further, in any of the above embodiments, the direct sound from the electrostatic
speaker does not reach the viewer U at all, but the direct sound may reach. Even if a direct sound
arrives, if the sound pressure level is relatively smaller than the sound pressure level relatively
coming from the direction of the reflector, the viewer U may be aware of the direction in which
the acoustic wave is most strongly coming. Yes, because the tuning effect described above
remains the same.
[0031]
The hardware implementation of the functions of the electrostatic speakers 10, 11, 12, 13, the
projection apparatus 30, and the control server 40 described above is not limited to the examples
described in the above embodiments, and is optional. For example, hardware means such as a
processor may be provided for each function, or a plurality of functions may be executed by one
processor. The processor may realize each function by executing the control program stored in
the storage unit (RAM, ROM, etc.). Such control programs are stored in computer readable
recording media such as magnetic recording media (magnetic tape, magnetic disk, etc.), optical
recording media (optical disks, etc.), magneto-optical recording media, semiconductor memory,
and distributed to users. It may be downloaded by the user via the Internet.
[0032]
1, 2, 3, 4, 5, 6, 7, ... sound system; 10, 11, 12, 13, ... electrostatic speaker; 20 ... reflector; 21 ...
liquid crystal display; · Projection device: 40 · · · Control server; 50 · · · Platform · 51 · Track · 52 ·
Vehicle ··· Support member: 112 · · · Posture control unit · 113 · · · Sound generation unit · · · · · · · ·
· · display surface state acquisition unit 115 · · · storage unit Direction adjustment unit 302 Angle
control unit 303 Communication unit 304 Video input unit 305 Projection unit 307 State
acquisition unit 401 Control unit 402: input unit: 403: communication unit: 404: storage unit: 40
1 ... device selection unit; 4012 ... state change unit; C ... ceiling; S ... sound emission surface; W ...
wall; V ... video display surface; F ... floor; U: Viewer: B: Signboard: RD: Display area: RL: Audible
area: T: Table: P1, P2, P3, P4: Supporter: Ra: rail
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