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DESCRIPTION JP2012216898

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DESCRIPTION JP2012216898
An audio output device capable of maximizing the sound pressure of an audible sound at a
desired distance from a sound hole is provided. A sound output device (100) has a parametric
speaker having a piezoelectric vibrator (10) and a sound hole (20) for emitting an ultrasonic
wave output from the piezoelectric vibrator (10). The sound output apparatus 100 further
adjusts the opening area of the sound hole 20 according to the operation unit (for example, the
operation unit / display unit 40) that receives the input operation of the target distance and the
distance input to the operation unit. It has an adjustment part (for example, it is comprised by
sound hole shutter member 31a, 31b, an actuator, and a control part). [Selected figure] Figure 1
Voice output device
[0001]
The present invention relates to an audio output device.
[0002]
A parametric speaker modulates an ultrasonic carrier wave with an audible sound signal using a
method such as AM / FM, maintains the high directivity of ultrasonic waves in the air and
radiates them. It is to demodulate the hearing.
Therefore, the sound pressure of the audible sound to be demodulated is maximized at a certain
distance from the sound hole of the parametric speaker, but the distance is fixedly determined by
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the modulation method, the modulation degree, the ultrasonic carrier sound pressure, etc. . The
parametric speaker is described, for example, in Patent Documents 1 and 2.
[0003]
JP, 2007-228402, A JP, 2008-13105, A
[0004]
As described above, in the parametric speaker, the sound pressure of the audible sound
demodulated at a certain distance from the sound hole is maximized.
Therefore, there is a need for a technology capable of maximizing the sound pressure of an
audible sound at a desired distance from the sound hole.
[0005]
An object of the present invention is to provide an audio output device capable of maximizing the
sound pressure of an audible sound at a desired distance from a sound hole.
[0006]
The present invention provides an oscillation device having a piezoelectric vibrator, a speaker
control unit for inputting a modulation signal for parametric speaker to the oscillation device, a
sound hole for emitting an ultrasonic wave output from the piezoelectric vibrator, and a target
distance. An audio output device comprising: an acquisition unit for acquiring information
indicating the information; and an opening area adjustment unit for adjusting the opening area of
the sound hole according to the information acquired by the acquisition unit.
[0007]
According to the present invention, the sound pressure of the audible sound can be maximized at
a desired distance from the sound hole.
[0008]
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It is principal part sectional drawing of the audio | voice output apparatus which concerns on
embodiment.
It is sectional drawing which shows the structure of the periphery of a piezoelectric vibrator.
It is a block diagram of an audio output device concerning an embodiment.
It is a figure which shows the relationship between the opening area of a sound hole, and the
distance which the sound pressure of an audible sound becomes the largest. It is a flowchart
which shows the flow of operation | movement of the audio | voice output apparatus which
concerns on embodiment. It is a figure which shows the example of the operation screen of the
audio | voice output apparatus which concerns on embodiment. It is a figure which shows the
example of the operation screen of the audio | voice output apparatus which concerns on
embodiment. It is a figure which shows the example of the operation screen of the audio | voice
output apparatus which concerns on embodiment.
[0009]
Hereinafter, embodiments of the present invention will be described using the drawings. In all
the drawings, the same components are denoted by the same reference numerals, and the
description thereof will be omitted as appropriate.
[0010]
1 is a cross-sectional view of the main part of the audio output device 100 according to the
embodiment, FIG. 2 is a cross-sectional view showing the structure around the piezoelectric
vibrator 10, FIG. 3 is a block diagram of the audio output device 100, and FIG. FIG. 5 is a
flowchart showing the flow of the operation of the audio output device 100, and FIG. 6 to FIG. 8
are diagrams showing the relationship between the opening area of the voice and the distance
(distance from the sound hole 20) at which the sound pressure of It is a figure which shows the
example of the operation screen of the audio | voice output device 100. FIG.
[0011]
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The audio output device 100 according to the present embodiment includes an oscillation device
70 having the piezoelectric vibrator 10, and a speaker control unit (for example, configured by
the control unit 50) that inputs a modulation signal for parametric speaker to the oscillation
device 70. A sound hole 20 for emitting an ultrasonic wave output from the piezoelectric vibrator
10, an acquisition unit (for example, an operation unit / display unit 40) for acquiring
information indicating a target distance, and information acquired by the acquisition unit And an
opening area adjustment unit (for example, constituted by the sound hole shutter members 31a
and 31b, the actuators 32a and 32b, and the control unit 50) for adjusting the opening area of
the sound hole 20.
Here, the parametric speaker (ultrasonic speaker) is configured to include a speaker control unit
and the piezoelectric vibrator 10. The audio output device 100 may be, for example, an electronic
device such as a portable telephone or other portable communication terminal device, a portable
telephone or other portable information terminal device, a laptop personal computer, or a small
game machine. The details will be described below.
[0012]
As shown in FIG. 1, the audio output device 100 includes a first case 1 accommodating the
oscillation device 70 (FIG. 2) including the piezoelectric vibrator 10 and a second case 2 covering
the periphery of the first case 1. And. At a position facing the piezoelectric vibrator 10 in the first
housing 1, a first opening 1 a communicating the inside and the outside of the first housing 1 is
formed. At a position facing the first opening 1 a in the second housing 2, a second opening 2 a
communicating the inside and the outside of the second housing 2 is formed. The sound hole 20
is configured to include the first and second openings 1a and 2a.
[0013]
As shown in FIG. 2, the oscillation device 70 includes a sheet-like vibrating member 71, the
piezoelectric vibrator 10, and a support portion 72. The piezoelectric vibrator 10 is attached to
one surface of the vibrating member 71. The support portion 72 supports the edge of the
vibrating member 71.
[0014]
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The vibrating member 71 vibrates by the vibration generated from the piezoelectric vibrator 10,
and oscillates a sound wave having a frequency of, for example, 20 kHz or more. The
piezoelectric vibrator 10 also oscillates a sound wave having a frequency of, for example, 20 kHz
or more when the piezoelectric vibrator 10 vibrates. The vibrating member 71 adjusts the
fundamental resonant frequency of the piezoelectric vibrator 10. The fundamental resonant
frequency of the mechanical oscillator depends on the load weight and the compliance. Since the
compliance is the mechanical rigidity of the piezoelectric vibrator 10, the basic resonant
frequency of the piezoelectric vibrator 10 can be controlled by controlling the rigidity of the
vibrating member 71. The thickness of the vibrating member 71 is preferably 5 μm or more and
500 μm or less. Moreover, as for the vibrating member 71, it is preferable that the longitudinal
elasticity coefficient which is a parameter | index which shows rigidity is 1 GPa or more and 500
GPa or less. If the rigidity of the vibrating member 71 is too low or too high, there is a possibility
that the characteristics and reliability of the mechanical vibrator will be impaired. The material
constituting the vibration member 71 is not particularly limited as long as it is a material having
a high elastic modulus with respect to the piezoelectric vibrator 10 which is a brittle material
such as metal or resin, but from the viewpoint of processability and cost And stainless steel are
preferable.
[0015]
The planar shape of the piezoelectric vibrator 10 is, for example, circular, but the planar shape of
the piezoelectric vibrator 10 is not limited to circular. In the piezoelectric vibrator 10, for
example, the entire surface facing the vibrating member 71 is fixed to the vibrating member 71
by an adhesive. Thus, the entire surface on one side of the piezoelectric vibrator 10 is restrained
by the vibrating member 71.
[0016]
The support portion 72 is made of, for example, a metal and is formed in a cylindrical shape (for
example, a cylindrical shape). One end of the support portion 72 is bonded to the first housing 1
via the bonding portion 3. The bonding unit 3 is, for example, a bonding material or a doublesided tape.
[0017]
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An oscillation signal is input to the piezoelectric vibrator 10 from the control unit 50 described
later to vibrate the piezoelectric vibrator 10 and cause the piezoelectric vibrator 10 to oscillate a
sound wave. The control unit 50 generates a modulation signal (a modulation signal for a
parametric speaker) to be input to the piezoelectric vibrator 10. The transport wave of the
modulation signal is, for example, an ultrasonic wave having a frequency of 20 kHz or more, and
specifically, for example, an ultrasonic wave of 100 kHz. The control unit 50 controls the
piezoelectric vibrator 10 according to the information input from the outside.
[0018]
A parametric speaker modulates an ultrasonic carrier wave with an audible sound signal using a
modulation method such as AM modulation, DSB modulation, SSB modulation, or FM modulation,
and radiates ultrasonic waves in air while maintaining high directivity. It demodulates the audible
sound by the non-linear phenomenon of the sound wave in the air. Therefore, at a certain
distance from the sound hole 20, the sound pressure of the audible sound to be demodulated
becomes maximum.
[0019]
The number of sound holes 20 is arbitrary. The number of the sound holes 20 may be one or
plural.
[0020]
A pair of sound hole shutter members 31 a and 31 b are disposed in the region of the space
between the first housing 1 and the second housing 2. These sound hole shutter members 31a
and 31b are formed in a flat plate shape. These sound hole shutter members 31a and 31b are
movable in directions parallel to their respective plate surfaces in a direction to narrow the
opening area of the sound holes 20 (for example, a direction approaching each other) and a
direction to widen (for example, a direction away from each other). It is provided. For example,
the sound hole shutter members 31 a and 31 b are in contact with the surface of the first
housing 1 on the side of the second housing 2 and the surface of the second housing 2 on the
side of the first housing 1. Slide against the surface of the As one sound hole shutter member
31a moves in the arrow A direction and the other sound hole shutter member 31b moves in the
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arrow B direction, the opening area of the sound hole 20 is reduced. Also, one sound hole shutter
member 31a moves in the arrow C direction (the opposite direction to the arrow A direction) and
the other sound hole shutter member 31 b moves in the arrow D direction (the opposite direction
to the arrow B direction). The opening area of the sound hole 20 is increased.
[0021]
The sound hole shutter members 31a and 31b are made of a material that attenuates or blocks
ultrasonic waves, and can be made of, for example, resin or metal. By moving the sound hole
shutter members 31 a and 31 b to adjust the opening area of the sound hole 20, it is possible to
control non-linear distortion generated in the sound hole 20. That is, as the opening area of the
sound hole 20 is reduced, the friction coefficient of air in the sound hole 20 is increased, and the
nonlinear distortion is increased. Therefore, the distance (the distance from the sound hole 20) at
which the sound pressure of the audible sound is maximum tends to be longer as the area of the
sound hole 20 is larger (see FIG. 4).
[0022]
As shown in FIG. 3, the sound output device 100 moves the sound hole shutter member 31 a in
the direction (arrow A direction) and widening direction (arrow C direction) of narrowing the
opening area of the sound hole 20; An actuator 32b is provided to move the shutter member 31b
in the direction (arrow B direction) to narrow the opening area of the sound hole 20 and in the
direction (arrow D direction) to widen the opening area. The actuators 32a and 32b move the
sound hole shutter members 31a and 31b by, for example, an electromagnetic drive method, a
piezoelectric drive method, or another drive method.
[0023]
The voice output device 100 further includes an operation unit / display unit 40 that performs
various display operations and also functions as an operation unit that receives an input
operation by the user. That is, the operation unit / display unit 40 can be configured by, for
example, a touch panel liquid crystal display device or the like, and not only performs a simple
display operation but also functions as a GUI (Graphical User Interface).
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[0024]
The voice output device 100 further includes a control unit 50 that controls the operation of the
piezoelectric vibrator 10, the actuators 32a and 32b, and the operation unit / display unit 40.
The control unit 50 has a control / calculation unit and a storage unit, and a table 51 is stored
and held in the storage unit.
[0025]
The table 51 includes a distance from the sound hole 20 at which the audible sound reproduced
by demodulating the ultrasonic wave emitted from the sound hole 20 is maximized (hereinafter,
the maximum distance of the audible sound pressure), the actuator 32a, It includes information
indicating the correspondence between 32b and the control parameter.
[0026]
The voice output device 100 is configured such that the user can change the distance (the
distance from the sound hole 20) at which the sound pressure of the audible sound to be
demodulated is maximum, as needed.
When the user inputs a desired distance (target distance) to the operation unit / display unit 40,
the control unit 50 controls the actuators 32a and 32b in accordance with the input distance,
thereby the sound hole shutter member The positions of 31a and 31b are adjusted to the
optimum position according to the input distance. That is, the opening area of the sound hole 20
is adjusted to the optimum area according to the input distance. As a result, it is possible to
output sound so that the sound pressure of the audible sound to be demodulated becomes
maximum at a position separated from the sound hole 20 by the distance inputted by the user.
As described above, the audio output device 100 includes the operation unit (operation unit and
display unit 40) that receives the input operation of the distance, and the aperture area
adjustment unit is configured to demodulate the ultrasonic wave emitted from the sound hole 20.
The aperture area is adjusted so that the audible sound reproduced by the speaker becomes
maximum at a position separated from the sound hole 20 by the distance input to the operation
unit.
[0027]
Further, at the time of operation control of the actuators 32a and 32b, the control unit 50
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acquires control parameters of the actuators 32a and 32b corresponding to the distance input by
the user from the table 51, and uses the acquired control parameters. The opening area is
adjusted (the position of the sound hole shutter members 31a and 31b is adjusted).
[0028]
The voice output device 100 is, for example, a mobile communication terminal device, and in this
case, the voice output device 100 has a communication unit (not shown) for realizing a
communication function.
Also, the voice output device 100 may realize a call function as a communication function.
Furthermore, the audio output device 100 may have a music reproduction function as an
example of the audio reproduction function.
[0029]
Next, a series of operations will be described with reference to FIGS. 5 to 8.
[0030]
First, in the normal state (for example, while playing music and waiting for an incoming call, etc.),
as shown in FIG. 6, for example, the function selection button group 42 including various
function selection buttons serves as an operation unit It is displayed on the display screen 41 of
the display unit 40.
The function selection button group 42 includes a distance selection button 42 a for performing
a request operation of transition to the distance selection mode. In this state, the control unit 50
monitors the presence or absence of an operation on the distance selection button 42a (step S11
in FIG. 5). This monitoring state continues unless the distance selection button 42a is operated
(when the determination in step S11 is N, the determination in step S11 is repeatedly
performed).
[0031]
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Thereafter, it is assumed that the distance selection button 42 a of the function selection button
group 45 is touch-operated. This operation is detected by the touch panel type operation unit /
display unit 40, and a detection signal indicating that the operation is detected is input from the
operation unit / display unit 40 to the control unit 50.
[0032]
Then, the control unit 50 determines that an operation for requesting transition to the distance
selection mode has been performed (Y in step S11). Subsequently, the control unit 50 shifts the
operation mode of the audio output device 100 to the distance selection mode. At this time, the
operation unit / display unit 40 displays the target distance selection window 43 as shown in
FIG. 7 on the display screen 41 under the control of the control unit 50 (displays the target
distance selection screen) (step S12).
[0033]
As shown in FIG. 7, in the target distance selection window 43, a message prompting the
selection operation of the target distance (for example, select "target distance". The selection
candidate 44 of the target distance is displayed together with the character string ". For example,
target distances can be selected as selection candidates 44 so that target distances can be
selected in 5 cm increments, such as 5 to 10 cm, 10 to 15 cm, 15 to 20 cm, ..., 90 to 95 cm, 95 to
100 cm, etc. It is displayed in the selection window 43. Furthermore, in the target distance
selection window 43, for example, a cursor 45 used for selecting a target distance is displayed.
[0034]
In this state, the control unit 50 monitors the presence or absence of the selection operation for
any selection candidate 44 of the target distance (step S13 in FIG. 5). This monitoring state
continues unless a selection operation is performed on any selection candidate 44 of the target
distance (if the determination in step S13 is N, the determination in step S13 is repeatedly
performed).
[0035]
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For example, when the user performs a touch operation on the display position of 15 to 20 cm
on the display screen 41, this operation is detected by the touch panel type operation unit /
display unit 40, and a detection indicating that the operation is detected A signal is input from
the operation and display unit 40 to the control unit 50. Then, the control unit 50 instructs the
operation unit / display unit 40 to perform display control to move the cursor 45 to the display
position of 15 to 20 cm, and 15 to 20 cm is selected as the target distance (input ) (Y in step
S13).
[0036]
Subsequently, the control unit 50 acquires control parameters corresponding to the selected
target distance from the table 51 (step S14), and as shown in FIG. (Display a confirmation screen
for switching of the target distance) (step S15).
[0037]
As shown in FIG. 8, for the confirmation window 46, for example, a range of 15 to 20 cm was
selected as the target distance.
Are you sure you want to change the ultrasonic speaker settings? In addition to the message
“”, the “Yes” and “No” selection button groups 47 and the cursor 48 for selecting any of
the selection buttons are displayed.
[0038]
In this state, the control unit 50 monitors the presence or absence of the selection operation for
the selection button of “Yes” or “No” (Step S16 in FIG. 5). If "No" is selected (N in step S16),
the processing from step S12 is repeated. When “Yes” is selected (Y in step S16), the control
unit 50 determines whether or not the setting change of the target distance is necessary (step
S17). That is, it is determined whether or not the control parameter corresponding to the target
distance set up to this point matches the control parameter corresponding to the target distance
selected this time.
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[0039]
As a result of the determination, when the control parameter corresponding to the target
distance set so far and the control parameter corresponding to the target distance selected this
time are the same, the control unit 50 does not need to change the setting. (N in step S18), that
is, it is determined that the previous settings should be continued, and the processing of FIG. 5 is
ended.
[0040]
On the other hand, when the control parameter corresponding to the target distance set up to
now and the control parameter corresponding to the target distance selected this time are
different, the control unit 50 needs to change the setting (step S18). Y) is determined, and the
opening area of the sound hole 20 is adjusted to the opening area according to the target
distance by controlling the actuators 32a and 32b according to the control parameters acquired
in the previous step S14 (step S19) .
Thereby, the sound hole 20 is such that the audible sound reproduced by the demodulation of
the ultrasonic wave emitted from the sound hole 20 is maximized at the position away from the
sound hole 20 by the target distance selected by the user. The opening area of can be adjusted.
[0041]
According to the embodiment as described above, the audio output device 100 includes the
oscillation device 70 having the piezoelectric vibrator 10, the speaker control unit for inputting
the modulation signal for the parametric speaker to the oscillation device 70, and the
piezoelectric vibrator 10 The aperture area of the sound hole 20 is adjusted according to the
information acquired by the sound hole 20 that emits the ultrasonic wave to be output, the
operation unit / display unit 40 that acquires information indicating the target distance, and the
operation unit / display unit 40 Sound area shutter (for example, the sound hole shutter
members 31a and 31b, the actuators 32a and 32b, and the control unit 50), the audible sound
reproduced by demodulating the ultrasonic wave emitted from the sound hole 20 The opening
area of the sound hole 20 can be adjusted so that it is maximum at a position away from the
sound hole 20 by a target distance selected by the user.
[0042]
Although the above-mentioned embodiment explained the example which has a pair of sound
hole shutter members 31a and 31b, the number of shutter members may be one, or three or
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more.
[0043]
In the above embodiment, an example was described in which the voice output device 100
acquires information indicating the target distance by the user performing an input (for example,
selection) operation of the target distance on the operation unit / display unit 40. Information
indicating the target distance may be acquired from an external device of the audio output device
100.
[0044]
DESCRIPTION OF SYMBOLS 1 1st housing | casing 1a 1st opening 2 2nd housing | casing 2a
2nd opening 3 adhesion part 10 piezoelectric vibrator 20 sound hole 31a sound hole shutter
member 31b sound hole shutter member 32a actuator 32b actuator 40 operation part / display
part 41 display Screen 42a Distance selection button 42 Function selection button group 43
Target distance selection window 45 Cursor 46 Confirmation window 47 Selection button group
48 Cursor 50 Control unit 51 Table 70 Oscillator device 71 Vibration member 72 Support unit
100 Audio output device
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