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JP2012160959

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DESCRIPTION JP2012160959
In an electronic device for displaying a plurality of contents simultaneously, audio corresponding
to the contents selected by each user is reproduced for each user. SOLUTION: A plurality of
oscillation devices 10 for outputting modulated waves of parametric speakers, a display unit 40
for simultaneously displaying a plurality of contents, a recognition unit for recognizing positions
of a plurality of users, and voices according to the contents The control unit controls the
oscillation device 10 to reproduce, and the control unit reproduces the voice corresponding to
the content selected by each user toward the position of each of the plurality of users recognized
by the recognition unit. The oscillation device 10 is controlled to do this. [Selected figure] Figure
1
Electronic device
[0001]
The present invention relates to an electronic device using ultrasonic waves.
[0002]
Various studies have been made on techniques relating to electronic devices such as portable
terminal devices.
For example, the technology described in Patent Document 1 measures the distance between the
antenna mounted on the portable communication device and the head using ultrasonic waves,
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and changes the matching condition of the matching circuit of the communication device based
on this distance. It is said that. Moreover, the technique regarding the speaker of a portable
terminal device is described in patent documents 2-4. FIG.
[0003]
The technique described in Patent Document 2 is to obtain a distance to an object imaged by an
imaging unit, and to localize a sound in a certain space according to this. Further, the technology
described in Patent Document 3 measures the distance between a listener and a speaker, and
reflects the distance on a filter coefficient using a head-related transfer function stored in a
database. Furthermore, Patent Document 4 describes a technique relating to a portable terminal
device provided with a plurality of superdirective speakers that output acoustic signals.
[0004]
JP-A-2000-124723 JP-A-2006-157558 JP-A-2007-28134 JP-A-2006-67386
[0005]
In an electronic device that simultaneously displays a plurality of contents, when a plurality of
sounds corresponding to the contents are reproduced, the sounds are mixed.
For this reason, when a plurality of users view different contents, it becomes difficult for each
user to recognize the voice corresponding to the contents he / she is viewing. Therefore, in an
electronic device that simultaneously displays a plurality of contents, when a plurality of users
view different contents, a voice corresponding to the contents selected by each user can be
reproduced to each user Is required.
[0006]
An object of the present invention is to reproduce, with respect to each user, audio
corresponding to the content selected by each user in an electronic device that displays a
plurality of contents simultaneously.
[0007]
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According to the present invention, a plurality of oscillation devices for outputting modulation
waves of a parametric speaker, a display unit for simultaneously displaying a plurality of
contents, a recognition unit for recognizing positions of a plurality of users, and a voice
corresponding to the contents A control unit that controls the oscillation device to reproduce the
content; and the control unit directs the position of each of the plurality of users recognized by
the recognition unit to the content selected by each user. An electronic device is provided for
controlling the oscillating device to reproduce a corresponding sound.
[0008]
According to the present invention, in an electronic device that simultaneously displays a
plurality of contents, audio corresponding to the contents selected by each user can be
reproduced for each user.
[0009]
It is a schematic diagram which shows the operation | movement method of the electronic device
which concerns on 1st Embodiment.
It is a block diagram which shows the electronic device shown in FIG.
It is a top view which shows the oscillation apparatus shown in FIG.
FIG. 4 is a cross-sectional view showing the oscillation device shown in FIG. 3; It is sectional
drawing which shows the piezoelectric vibrator shown in FIG. It is a flowchart which shows the
operation | movement method of the electronic device shown in FIG. It is a block diagram
showing the electronic device concerning a 2nd embodiment.
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. In all the drawings, the same components are denoted by the same reference numerals,
and the description thereof will be appropriately omitted.
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[0011]
FIG. 1 is a schematic view showing an operation method of the electronic device 100 according
to the first embodiment. FIG. 2 is a block diagram showing the electronic device 100 shown in
FIG. The electronic device 100 includes a plurality of oscillation devices 10, a display unit 40, a
recognition unit 30, and a control unit 20. The electronic device 100 is, for example, a television,
display on digital signage, a portable terminal device, or the like.
[0012]
The oscillator 10 outputs an ultrasonic wave 16. The ultrasonic wave 16 is a modulation wave of
a parametric speaker. The display unit 40 simultaneously displays a plurality of contents. The
recognition unit 30 recognizes the positions of a plurality of users. The control unit 20 controls
the oscillation device 10 so as to reproduce the sound according to the content. Then, the control
unit 20 controls the oscillation device 10 to reproduce voice corresponding to the content
selected by each user toward the position of each of the plurality of users recognized by the
recognition unit 30. The configuration of the electronic device 100 will be described in detail
below with reference to FIGS.
[0013]
As shown in FIG. 1, the electronic device 100 further includes, for example, a housing 90. As
shown in FIG. 2, the oscillation device 10, the control unit 20, the recognition unit 30, and the
display unit 40 are disposed, for example, inside the housing 90.
[0014]
The plurality of oscillation devices 10 are separately controlled by, for example, the control unit
20. Further, as shown in FIG. 2, the oscillation device 10 can be configured by a plurality of
oscillation devices 12. The plurality of oscillation devices 12 are separately controlled by, for
example, the control unit 20.
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[0015]
As shown in FIG. 1, the display unit 40 simultaneously displays two contents by, for example, two
screens divided and displayed on the left and right. However, the form of the display of the
plurality of contents by the display unit 40 can be changed in any way, for example, by the
operation of the user. For example, two contents divided up and down can simultaneously display
two contents, and four screens can simultaneously display four contents.
[0016]
The recognition unit 30 includes an imaging unit 32 and a determination unit 34. The imaging
unit 32 captures an area including a plurality of users to generate image data. The determination
unit 34 determines the position of each user by processing the image data. The determination of
the position of each user is performed, for example, by individually storing and storing in
advance feature quantities identifying the respective users, and collating the feature quantities
with the image data. The feature amount includes, for example, the size of the distance between
the eyes, or the size and shape of a triangle connecting the eyes and the nose. In addition, the
recognition unit 30 may have a function of automatically following the user and determining the
position of the user when the user moves in the area imaged by the imaging unit 32.
[0017]
The control unit 20 is connected to the oscillation device 10, the recognition unit 30, and the
display unit 40. The control unit 20 controls each of the oscillation devices 10 to reproduce voice
corresponding to the content selected by each user toward the position of each of the plurality of
users. This is performed, for example, as follows. First, the feature amount of each user is
registered in association with the ID for each user. Then, the content selected by each user is
associated with the ID of each user. Then, the ID corresponding to the specific content is selected,
and the identification amount associated with the selected ID is read out. Then, the user having
the read identification amount is selected by image processing, and the voice corresponding to
the content is reproduced to the user.
[0018]
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FIG. 3 is a plan view showing the oscillation device 10 shown in FIG. As shown in FIG. 3, the
oscillation device 10 is configured, for example, by arranging a plurality of oscillation devices 12
in an array.
[0019]
FIG. 4 is a cross-sectional view showing the oscillation device 12 shown in FIG. The oscillation
device 12 includes a piezoelectric vibrator 60, a vibrating member 62, and a support member 64.
The piezoelectric vibrator 60 is provided on one surface of the vibrating member 62. The
support member 64 supports the edge of the vibrating member 62.
[0020]
The control unit 20 is connected to the piezoelectric vibrator 60 via the signal generation unit
22. The signal generation unit 22 generates an electrical signal to be input to the piezoelectric
vibrator 60. The control unit 20 controls the signal generation unit 22 based on the information
input from the outside, thereby controlling the oscillation of the oscillation device 12. The control
unit 20 inputs a modulation signal as a parametric speaker via the signal generation unit 22. At
this time, the piezoelectric vibrator 60 uses a sound wave of 20 kHz or more, for example, 100
kHz as a transport wave of the signal.
[0021]
FIG. 5 is a cross-sectional view showing the piezoelectric vibrator 60 shown in FIG. As shown in
FIG. 4, the piezoelectric vibrator 60 includes a piezoelectric body 70, an upper electrode 72 and a
lower electrode 74. The piezoelectric vibrator 60 also has, for example, a circular or elliptical
shape. The piezoelectric body 70 is sandwiched between the upper electrode 72 and the lower
electrode 74. Further, the piezoelectric body 70 is polarized in the thickness direction. The
piezoelectric body 70 is made of a material having a piezoelectric effect, and is made of, for
example, lead zirconate titanate (PZT) or barium titanate (BaTiO 3) as a material having high
electromechanical conversion efficiency. The thickness of the piezoelectric body 70 is preferably
10 μm to 1 mm. When the thickness is less than 10 μm, since the piezoelectric body 70 is
made of a brittle material, breakage or the like is likely to occur during handling. On the other
hand, when the thickness exceeds 1 mm, the electric field strength of the piezoelectric body 70 is
reduced. This leads to a decrease in energy conversion efficiency.
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[0022]
The upper electrode 72 and the lower electrode 74 are made of a material having electrical
conductivity, such as silver or silver / palladium alloy. Silver is a general purpose material with
low resistance, and is advantageous in terms of manufacturing cost and manufacturing process.
In addition, a silver / palladium alloy is a low resistance material excellent in oxidation resistance
and excellent in reliability. The thickness of the upper electrode 72 and the lower electrode 74 is
preferably 1 to 50 μm. If the thickness is less than 1 μm, uniform molding becomes difficult.
On the other hand, if it exceeds 50 μm, the upper electrode 72 or the lower electrode 74
becomes a constraining surface with respect to the piezoelectric body 70, resulting in a decrease
in energy conversion efficiency.
[0023]
The vibrating member 62 is made of a material such as metal or resin having a high elastic
modulus with respect to ceramic which is a brittle material, and is made of a general-purpose
material such as phosphor bronze or stainless steel. The thickness of the vibrating member 62 is
preferably 5 to 500 μm. The longitudinal elastic modulus of the vibrating member 62 is
preferably 1 to 500 GPa. If the longitudinal elastic modulus of the vibrating member 62 is
excessively low or high, the characteristics and reliability as a mechanical vibrator may be
impaired.
[0024]
In the present embodiment, sound is reproduced using the operation principle of the parametric
speaker. The principle of operation of the parametric speaker is as follows. The principle of
operation of the parametric speaker is that ultrasonic waves with AM modulation, DSB
modulation, SSB modulation, FM modulation are emitted into the air, and the audible sound
appears due to non-linear characteristics when the ultrasonic waves propagate in the air Sound
reproduction. The term "nonlinear" as used herein means transition from laminar flow to
turbulent flow when the Reynolds number represented by the ratio of the inertial action of the
flow to the viscous action increases. That is, since the sound wave is finely disturbed in the fluid,
the sound wave is non-linearly propagating. In particular, when ultrasonic waves are emitted into
the air, harmonics associated with the non-linearity are significantly generated. In addition,
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sound waves are in a dense / dense state in which molecular groups in the air are mixed in
density. If it takes time for air molecules to recover more than compression, air that can not be
recovered after compression will collide with continuously propagating air molecules, producing
shock waves and producing audible sounds. The parametric speaker can form a sound field only
around the user and is excellent in terms of privacy protection.
[0025]
Next, an operation method of the electronic device 100 will be described. FIG. 6 is a flow chart
showing an operation method of the electronic device 100 shown in FIG. First, each user selects
the content he / she wants to view and inputs it to the electronic device 100 (S10). Next, the
display unit 40 displays a plurality of contents selected by each user (S11). At this time, the
display unit 40 simultaneously displays a plurality of contents.
[0026]
Next, the recognition unit 30 recognizes the positions of a plurality of users (S12). The positions
of the plurality of users are determined by processing the image data generated by the imaging
unit 32 by the determination unit 34. Then, the control unit 20 controls the oscillation device 10
to reproduce voice corresponding to the content selected by each user toward the position of
each of the plurality of users recognized by the recognition unit 30 (S13). When the recognition
unit 30 recognizes the position of the user following and recognizes, the control unit 20 controls
the direction in which the oscillation device 10 reproduces the voice as needed based on the
position of the user recognized by the recognition unit 30. You may do it.
[0027]
Next, the effects of the present embodiment will be described. According to the electronic device
100 according to the present embodiment, the sound corresponding to the content is reproduced
by the ultrasonic wave 16 output from the oscillation device 10. Then, the control unit 20
controls the oscillation device 10 to reproduce the voice corresponding to the content selected
by each user toward the position of each of the plurality of users. Since the sound corresponding
to the content is reproduced by highly directional ultrasonic waves, a plurality of sounds
corresponding to each content do not mix with each other. Therefore, in the electronic device
which displays a plurality of contents simultaneously, the sound corresponding to the contents
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selected by each user can be reproduced for each user.
[0028]
FIG. 7 is a block diagram showing the electronic device 102 according to the second
embodiment, which corresponds to FIG. 2 according to the first embodiment. The electronic
device 102 according to the present embodiment is the same as the electronic device 100
according to the first embodiment except that the electronic device 102 according to the present
embodiment includes a plurality of detection terminals 50.
[0029]
The plurality of detection terminals 50 are held by each of the plurality of users. Then, the
recognition unit 30 recognizes the position of the user by recognizing the position of the
detection terminal 50. The recognition of the position of the detection terminal 50 by the
recognition unit 30 is performed, for example, when the recognition unit 30 receives a radio
wave emitted from the detection terminal 50. In addition, the recognition unit 30 may have a
function of automatically tracking the user to determine the position of the user when the user
holding the detection terminal 50 moves. The detection terminal 50 may have, for example, a
function of selecting content and a function of adjusting the volume of sound reproduced by the
ultrasonic wave 16.
[0030]
In addition, the recognition unit 30 may include the imaging unit 32 and the determination unit
34. The imaging unit 32 generates image data obtained by imaging an area including the user,
and the determination unit 34 processes the image data, whereby the user's detailed ear position
and the like can be identified. Therefore, the position of the user can be more accurately
recognized by using the detection terminal 50 in combination with the position detection.
[0031]
Also in the present embodiment, the control unit 20 controls each of the oscillation devices 10 so
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as to reproduce voice corresponding to the content selected by each user toward the position of
each of the plurality of users. This is performed, for example, as follows. First, the ID of each
detection terminal 50 is registered in advance. Next, the content selected by each user is
associated with the ID of the detection terminal 50 held by each user. Then, from each detection
terminal 50, an ID indicating each detection terminal 50 is transmitted. The recognition unit 30
recognizes the position of the detection terminal 50 based on the direction in which the ID has
been transmitted. Then, the voice corresponding to the content is reproduced to the user holding
the detection terminal 50 having the ID corresponding to the specific content. In addition, when
each user operates the detection terminal 50 held by the user to select content, the user may
have the detection terminal 50 play the sound according to the content.
[0032]
Also in this embodiment, the same effect as that of the first embodiment can be obtained.
[0033]
Although the embodiments of the present invention have been described above with reference to
the drawings, these are merely examples of the present invention, and various configurations
other than the above can also be adopted.
[0034]
Reference Signs List 10 oscillator device 12 oscillator device 16 ultrasonic wave 20 control unit
22 signal generation unit 30 recognition unit 32 imaging unit 34 determination unit 40 display
unit 50 detection terminal 60 piezoelectric vibrator 62 vibration member 64 support member 70
piezoelectric body 72 upper electrode 74 lower electrode 90 Case 100 Electronic Device 102
Electronic Device
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