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JP2013192046

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DESCRIPTION JP2013192046
Abstract: To make a listener recognize the audible sound field range of voice in an acoustic
system that changes the directivity of voice using a parametric speaker. A sound system 10
includes an audible sound output speaker 180, a parametric speaker 280, an output destination
switching unit 130 for switching an audio output destination, and a first irradiation range
according to switching to the audible sound output speaker 180. While irradiating light to LAw,
according to the switch to the parametric speaker 280, the irradiation part 400 which irradiates
light to 2nd irradiation range LAn is provided. [Selected figure] Figure 3
Sound system
[0001]
The present invention relates to an acoustic system that generates sound.
[0002]
As a speaker for reproducing sound, in addition to a general audible sound output speaker for
outputting an audible sound wave to reproduce sound, a parametric speaker for outputting an
ultrasonic wave to reproduce sound is known.
[0003]
Patent Document 1 describes an acoustic system that illuminates an audible sound field range on
a floor surface by a parametric speaker with light in order to make it possible to visually confirm
the range in which the voice of the parametric speaker can be heard.
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1
[0004]
Patent Document 2 describes an acoustic system that changes the directivity of reproduced
sound by switching the output destination of sound between an audible sound output speaker
and a parametric speaker.
In such an acoustic system, an audible sound output speaker is used as an output destination
when changing the directivity to a wide angle range having a relatively wide directivity angle,
and the directivity of a narrow angle range having a relatively narrow directivity angle is used.
Use parametric speakers as the output destination when making changes.
[0005]
JP-A-11-27774 JP-A-2007-67514
[0006]
In an acoustic system that changes the directivity of voice using a parametric speaker, it is
difficult for the listener to recognize itself from the heard voice whether it is voice by an audible
sound output speaker or voice by a parametric speaker. The
[0007]
An object of the present invention is to make a listener recognize the audible sound field range of
voice in an acoustic system which changes the directivity of voice using a parametric speaker in
view of the above-mentioned subject.
[0008]
The present invention has been made to solve at least a part of the above-described problems,
and can be realized as the following modes or application examples.
[0009]
[Application Example 1] The sound system according to Application Example 1 includes an
audible sound output speaker that outputs an audible sound wave and reproduces voice, a
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parametric speaker that outputs an ultrasonic wave and reproduces sound, the audible sound
output speaker, and Corresponds to the audible sound field range of the audio by the audible
sound output speaker according to the output destination switching unit for switching the audio
output destination between the parametric speaker and the audible sound output speaker by the
output destination switching unit Light to the first irradiation range, and according to the
switching to the parametric speaker by the output destination switching unit, the light to the
second irradiation range corresponding to the audible sound field range of the sound by the
parametric speaker And an irradiation unit for irradiating.
According to this application example, it is possible to make the listener recognize each audible
sound field range of the audible sound output speaker and the parametric speaker.
[0010]
Application Example 2 In the sound system of application example 1, the emission direction of
the ultrasonic wave by the parametric speaker is matched with the emission direction of the
audio sound wave by the audio sound output speaker, and the audio sound output speaker and
the parametric speaker And the irradiation unit may be disposed on the side opposite to the
direction of emission of the audio sound wave and the ultrasonic wave with respect to the
audible sound output speaker and the parametric speaker.
According to this application, the correlation between the audible sound field range of the
audible sound output speaker and the first irradiation range, without inhibiting the reproduction
of the sound by the audible sound output speaker and the parametric speaker at the irradiation
unit, and The correlation between the audible sound field range of the parametric speaker and
the second illumination range can be improved respectively.
[0011]
Application Example 3 In the acoustic system according to Application Example 1 or Application
Example 2, the irradiation unit includes a light source for emitting light, and a lens for adjusting a
path of light from the light source, and the irradiation unit includes the light source. The
irradiation range may be switched between the first irradiation range and the second irradiation
range by moving at least one of the light source and the lens.
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According to this application example, the irradiation range of light can be easily switched
between the first irradiation range and the second irradiation range.
[0012]
Application Example 4 In the acoustic system according to Application Example 1 or Application
Example 2, the irradiating unit includes a light source for emitting light and a reflecting mirror
for reflecting light from the light source, and the irradiating unit is for the light source The
irradiation range may be switched between the first irradiation range and the second irradiation
range by moving at least one of the reflecting mirrors.
According to this application example, the irradiation range of light can be easily switched
between the first irradiation range and the second irradiation range.
[0013]
The form of the present invention is not limited to the sound system, and can be applied to other
forms such as a computer program for controlling the sound system and a method of generating
sound.
Further, the present invention is not limited to the above-described embodiment, and it goes
without saying that the present invention can be practiced in various embodiments without
departing from the scope of the present invention.
[0014]
It is an explanatory view showing composition of an acoustic system.
It is explanatory drawing which shows the structure of an audible sound output speaker and a
parametric speaker. It is explanatory drawing which shows a mode that an irradiation part
irradiates light at the time of wide angle orientation. It is explanatory drawing which shows a
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mode that an irradiation part irradiates light at the time of narrow angle direction. It is
explanatory drawing which shows a mode that an irradiation part irradiates light at the time of
the wide angle orientation in 2nd Embodiment. It is explanatory drawing which shows a mode
that an irradiation part irradiates light at the time of narrow angle direction in 2nd Embodiment.
[0015]
In order to further clarify the configuration and operation of the present invention described
above, an acoustic system to which the present invention is applied will be described below.
[0016]
A.
First embodiment: A-1. Configuration of Sound System: FIG. 1 is an explanatory view showing a
configuration of the sound system 10. As shown in FIG. The sound system 10 is a device that
generates sound. In the present embodiment, the sound system 10 is a device that generates
sound in a relatively large space (for example, a park, a commercial facility, a station, a hall, a
house) including outdoors and indoors.
[0017]
The sound system 10 includes an audio signal input unit 110, an audio signal processing unit
120, an output destination switching unit 130, a signal amplifier 160, an audible sound output
speaker 180, a modulation unit 240, an ultrasonic oscillator 250, and a signal. An amplifier 260
and a parametric speaker 280 are provided. The sound system 10 is configured to be able to
switch the sound output destination between the audible sound output speaker 180 and the
parametric speaker 280. Thereby, the acoustic system 10 has directivity (wide-angle pointing) in
a wide-angle range with a relatively wide directivity angle by the audio sound output speaker
180 and directivity in a narrow-angle range with a relatively narrow directivity angle (parametric
speaker 280) It is possible to change the directivity of voice between narrow angle pointing).
[0018]
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The audio signal input unit 110 of the audio system 10 receives an input of an audio signal from
an audio device 80 which is an external device of the audio system 10. The audio device 80 is a
device that outputs an audio signal, and includes a microphone, a CD player (Compact Disc
Player), a DVD player (Digital Versatile Disc Player), a digital audio player (Digital Audio Player),
a tuner (Tuner), and the like.
[0019]
The audio signal processing unit 120 of the audio system 10 processes the audio signal input to
the audio signal input unit 110. In the present embodiment, the audio signal processing unit 120
is an equalizer that processes the audio signal input to the audio signal input unit 110 for each
band.
[0020]
The output destination switching unit 130 of the audio system 10 switches the output
destination of the audio based on the audio signal processed by the audio signal processing unit
120 between the audible sound output speaker 180 and the parametric speaker 280. In the
present embodiment, the output destination switching unit 130 is a switch that switches the
connection destination on the audio signal processing unit 120 that outputs the audio signal
between the audible sound output speaker 180 side and the parametric speaker 280 side.
[0021]
The signal amplifier 160 of the sound system 10 is an amplifier that amplifies the audio signal
processed by the audio signal processing unit 120 according to the characteristics of the audible
sound output speaker 180.
[0022]
The audible sound output speaker 180 of the sound system 10 is a device that outputs an
audible sound wave to reproduce sound by converting an audio signal (electric signal) processed
by the signal amplifier 160 into a physical signal (physical vibration). .
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The audible sound output speaker 180 is a dynamic loudspeaker (Loudspeaker) in this
embodiment, but may be another speaker such as a ribbon loudspeaker or a condenser
loudspeaker in other embodiments.
[0023]
The modulator 240 of the acoustic system 10 modulates the carrier wave signal of the ultrasonic
wave generated by the ultrasonic oscillator 250 using the audio signal processed by the audio
signal processor 120. The signal amplifier 260 of the acoustic system 10 is an amplifier that
amplifies the carrier signal processed by the modulator 240 according to the characteristics of
the parametric speaker 280.
[0024]
The parametric speaker 280 of the acoustic system 10 comprises a plurality of ultrasonic
transducers 288 juxtaposed on a plane. The parametric speaker 280 outputs an ultrasonic wave
by converting the carrier signal processed by the signal amplifier 260 into a physical signal
(physical vibration) by a plurality of ultrasonic transducers 288, and reproduces audio in the
audible range by the parametric array effect. Do. The number of ultrasonic transducers 288 is
eight in the present embodiment, but may be smaller or larger than eight in other embodiments.
[0025]
In the present embodiment, the carrier signal is amplitude-modulated in the modulation unit 240,
and an ultrasonic wave based on the amplitude-modulated carrier signal is generated in the air
by the parametric speaker 280. Thereby, the sound in the audible range is generated by the nonlinear characteristic when the ultrasonic wave propagates in the air.
[0026]
In another embodiment, the carrier wave signal is frequency-modulated in the modulation unit
240, and an ultrasonic wave based on the frequency-modulated carrier wave and an ultrasonic
wave based on the original carrier wave signal generated by the ultrasonic wave generator 250
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are received by the parametric speaker 280. It may be generated simultaneously in the air. This
makes it possible to generate audio in the audible range by the frequency difference between the
two ultrasonic waves.
[0027]
FIG. 2 is an explanatory view showing the configuration of the audible sound output speaker 180
and the parametric speaker 280. As shown in FIG. The parametric speaker 280 is configured by
arranging a plurality of ultrasonic transducers 288 around an audible sound output speaker 180.
In this embodiment, one audible sound output speaker 180 is disposed at the center of three
rows and three columns, and eight ultrasonic transducers 288 are disposed around the audible
sound output speaker 180, respectively.
[0028]
The configuration of the parametric speaker 280 may be a configuration in which a plurality of
ultrasonic transducers 288 are disposed around the audible sound output speaker 180, and two
ultrasonic transducers 288 at both ends of one audible sound output speaker 180. The four
ultrasonic transducers 288 may be disposed on the top, bottom, left, and right of one audible
sound output speaker 180, respectively. In other embodiments, the number of audible sound
output speakers 180 may be more than one. In other embodiments, the number of ultrasound
transducers 288 may be less or more than eight.
[0029]
FIG. 2 illustrates XYZ axes orthogonal to each other. The XYZ axes in FIG. 2 correspond to XYZ
axes in other figures described later. The row direction of the arrangement in which the plurality
of ultrasonic transducers 288 are arranged is taken as the X axis, the column direction as the Y
axis, and the direction in which the ultrasonic transducers 288 emit ultrasonic waves as the Z
axis. The direction from the ultrasonic transducer 288 to the direction of propagation of the
ultrasonic waves is + Z axis direction, and the opposite is -Z axis direction. In the present
embodiment, the audible sound output speaker 180 and the ultrasonic transducer 288 are
disposed on a plane parallel to the X axis and the Y axis.
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[0030]
Returning to the description of FIG. 1, the sound system 10 further includes a switching
instruction input unit 310, a switching control unit 330, a notification unit 380, and an
irradiation unit 400.
[0031]
The switching instruction input unit 310 of the sound system 10 receives, from the operator of
the sound system 10, an instruction input to switch the output destination of the sound.
In the present embodiment, the switching instruction input unit 310 is a push button switch, but
in another embodiment, it may be a touch panel, or may be a device that recognizes the voice of
the operator, or the operator It may be a receiver that receives a signal from a device handled by.
[0032]
The switching control unit 330 of the sound system 10 controls the operation of the output
destination switching unit 130. The switching control unit 330 includes a light control unit 334.
The light control unit 334 instructs the irradiation unit 400 to change the irradiation mode of the
light according to the switching of the output destination of the sound. In the present
embodiment, the functions including the light control unit 334 in the switching control unit 330
are realized as software by the CPU operating based on a computer program. In another
embodiment, at least a part of the functions of the switching control unit 330 may be realized as
hardware based on the circuit configuration of the switching control unit 330.
[0033]
The notification unit 380 of the sound system 10 notifies various information based on the
control signal from the switching control unit 330. In the present embodiment, the notification
unit 380 is a display, and notifies information by an image of light. In another embodiment, the
notification unit 380 may be an LED (Light Emitting Diode) capable of notifying information by
light, a rotating light, or the like, or may be a speaker capable of notifying information by voice.
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[0034]
In the present embodiment, the notification unit 380 notifies the output destination of the sound
selected by the output destination switching unit 130. In the present embodiment, when the
audible sound output speaker 180 is selected as the audio output destination, the notification
unit 380 lights up and displays the characters wide angle , and the parametric speaker 280 is
selected as the audio output destination. In the case, the notification unit 380 lights and displays
the characters narrow angle .
[0035]
The irradiation unit 400 of the sound system 10 irradiates light to the irradiation range
corresponding to the audible sound field range of the audio according to each output destination
according to the output destination of the audio switched by the output destination switching
unit 130. In the present embodiment, based on the control signal from the light control unit 334
of the switching control unit 330, the irradiation unit 400 irradiates light to the irradiation range
corresponding to the audible sound field range of the sound by each output destination.
[0036]
FIG. 3 is an explanatory view showing a state in which the irradiation unit 400 irradiates light at
the time of wide angle orientation. FIG. 4 is an explanatory view showing how the irradiation unit
400 irradiates light at narrow angle direction. In FIG. 3 and FIG. 4, the audio sound field range
DAw, which is a range in which the audio reproduced by the audible sound output speaker 180
can be heard, is hatched to the lower right. In FIG. 3 and FIG. 4, the audio sound field range DAn,
which is a range in which the reproduced sound from the parametric speaker 280 can be heard,
is hatched to the left. The audible sound field range DAn of the parametric speaker 280
corresponds to the arrival area of ultrasonic waves from the parametric speaker 280.
[0037]
As shown in FIGS. 3 and 4 as the audible sound field range DAw, the audible sound output
speaker 180 has directivity characteristics in a relatively wide wide-angle range. As shown as the
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audible sound field range DAn in FIGS. 3 and 4, the parametric speaker 280 has directional
characteristics in a relatively narrow narrow angle range. In the present embodiment, in the
range where the audible sound field range DAw and the audible sound field range DAn overlap,
the audio reproduced by the audible sound output speaker 180 and the audio reproduced by the
parametric speaker 280 have the same sound pressure level at the same position. Adjusted to be
recognized as
[0038]
The central axis of the audible sound field range DAw of the audible sound output speaker 180
and the central axis of the audible sound field range DAn of the parametric speaker 280
substantially coincide with the axis C parallel to the Z-axis direction. That is, the audible sound
output speaker 180 and the parametric speaker 280 are configured in such a manner that the
emission direction of the ultrasonic wave by the parametric speaker 280 (+ Z axis direction)
matches the direction of the acoustic sound emission by the audible sound output speaker 180 (+
Z axis direction). ing.
[0039]
As shown in FIG. 3 and FIG. 4, the irradiating section 400 is the side opposite to the sound wave
emission direction (+ Z-axis direction) by each speaker than the audible sound output speaker
180 and the parametric speaker 280, ie, the −Z-axis direction Is located in In the present
embodiment, the central axis of the irradiation range of light by the irradiation unit 400
substantially coincides with the axis C. The irradiation unit 400 includes a light source 420, a
convex lens 430, a concave lens 440, a reflecting mirror 450, and a moving unit 460.
[0040]
The light source 420 of the irradiation unit 400 emits light in the + Z axis direction. In the
present embodiment, the light source 420 is an ultra-high pressure mercury lamp (UHE lamp),
but in another embodiment, it may be an LED or an LD (Laser Diode).
[0041]
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The convex lens 430 of the irradiation unit 400 is provided on the + Z-axis direction side of the
light source 420, and condenses the light emitted from the light source 420 onto the concave
lens 440. The convex lens 430 is configured by one lens in the present embodiment, but may be
configured by combining a plurality of lenses in another embodiment.
[0042]
The concave lens 440 of the irradiation unit 400 is provided on the + Z-axis direction side of the
convex lens 430, and diffuses the light collected by the convex lens 430 toward the audible
sound output speaker 180 and the parametric speaker 280. In the present embodiment, the
concave lens 440 is configured of one lens, but in another embodiment, the concave lens 440
may be configured by combining a plurality of lenses.
[0043]
The reflecting mirror 450 of the irradiation unit 400 is provided around the convex lens 430 and
the concave lens 440 to prevent light leakage from the light source 420 through the convex lens
430 to the concave lens 440. In the present embodiment, the reflecting mirror 450 has a
cylindrical shape whose diameter increases in the + Z axis direction.
[0044]
The moving unit 460 of the irradiation unit 400 is a mechanism that switches the irradiation
range of light by moving the light source 420 according to the output destination of the sound
switched by the output destination switching unit 130. In the present embodiment, the moving
unit 460 moves the light source 420 along the Z-axis direction based on the control signal from
the light adjusting unit 334 of the switching control unit 330. In the present embodiment, the
moving unit 460 is a mechanism that positions the light source 420 using a stepping motor.
[0045]
As shown in FIG. 3, when the audible sound output speaker 180 is selected as the audio output
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destination (at the time of wide-angle pointing), the moving unit 460 moves the light source 420
toward the −Z axis direction, and the light source 420 and the convex lens A distance along the
Z-axis direction between 430 and 430 is set as a distance LDw larger than the distance LDn at
the time of narrow angle directivity. As a result, the diffusion angle of the light emitted from the
concave lens 440 becomes larger than in the narrow-angle orientation, and the light is irradiated
to the first irradiation range LAw corresponding to the audible sound field range DAw of the
audible sound output speaker 180.
[0046]
As shown in FIG. 4, when the parametric speaker 280 is selected as the audio output destination
(in narrow angle direction), the moving unit 460 moves the light source 420 toward the + Z axis
direction, and the light source 420 and the convex lens 430 The distance along the Z-axis
direction between them is a distance LDn smaller than the distance LDw at the time of wide-angle
directional control. As a result, the diffusion angle of the light emitted from the concave lens 440
becomes smaller than that at the time of wide-angle orientation, and the light is irradiated to the
second irradiation range LAn corresponding to the audible sound field range DAn of the
parametric speaker 280.
[0047]
In the first embodiment described above, in response to switching to the audible sound output
speaker 180 by the output destination switching unit 130, the first irradiation range LAw
corresponding to the audible sound field range DAw of the sound by the audible sound output
speaker 180. The second irradiation range LAn corresponding to the audible sound field range
DAn of the sound by the parametric speaker 280 is irradiated according to the switching to the
parametric speaker 280 by the output destination switching unit 130 while irradiating the light
by the irradiation unit 400 Light is emitted by the unit 400. This enables the listener to recognize
the audible sound field ranges of the audible sound output speaker 180 and the parametric
speaker 280.
[0048]
Further, in the first embodiment, the audible sound output speaker 180 and the parametric
speaker 280 are configured by matching the emitting direction of the ultrasonic wave by the
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parametric speaker 280 with the emitting direction of the audible sound wave by the audible
sound output speaker 180. The irradiation part 400 was arrange ¦ positioned rather than the
speaker 180 and the parametric speaker 280 at the-Z-axis direction side. Thereby, the
correlation between the audible sound field range DAw of the audible sound output speaker 180
and the first irradiation range LAw without inhibiting the audio reproduction by the audible
sound output speaker 180 and the parametric speaker 280 by the irradiation unit 400 And the
correlation between the audible sound field range DAn and the second illumination range LAn of
the parametric speaker 280 can be improved, respectively.
[0049]
Further, since the irradiation range of light is switched by moving the light source 420 in the
irradiation unit 400, the irradiation range of light can be easily switched between the first
irradiation range LAw and the second irradiation range LAn.
[0050]
B.
Second Embodiment In the description of the second embodiment, the same reference numerals
as in the first embodiment are used for the same configuration as the first embodiment, but the
configuration or operation is different but the configuration corresponding to the first
embodiment is used. A code obtained by adding an English letter "B" to the code of the first
embodiment is used.
[0051]
The acoustic system 10B of the second embodiment is the same as the acoustic system 10 of the
first embodiment except that the acoustic system 10B of the second embodiment includes an
irradiation unit 400B different from the irradiation unit 400 of the first embodiment.
[0052]
FIG. 5 is an explanatory view showing a state in which the irradiation unit 400B irradiates light at
the time of wide angle orientation in the second embodiment.
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FIG. 6 is an explanatory view showing a state in which the irradiating unit 400B irradiates light at
the narrow angle direction in the second embodiment. The audible sound field range DAw and
the audible sound field range DAn are illustrated in FIGS. 5 and 6 similarly to FIGS. 3 and 4.
[0053]
As shown in FIGS. 5 and 6, the irradiation unit 400B of the second embodiment is disposed on
the -Z-axis direction side with respect to the audible sound output speaker 180 and the
parametric speaker 280 similarly to the irradiation unit 400 of the first embodiment. It is done.
In the present embodiment, the central axis of the irradiation range of light by the irradiation
unit 400B substantially coincides with the axis C. The irradiation unit 400B includes a light
source 420B, a concave boundary 422B, a reflecting mirror 450B, and a moving unit 460B.
[0054]
The light source 420B of the irradiation unit 400B emits light in the −Z-axis direction. In the
present embodiment, the light source 420B is an ultra-high pressure mercury lamp (UHE lamp),
but in another embodiment, the light source 420B may be an LED or an LD (Laser Diode).
[0055]
The concave boundary 422B of the irradiating unit 400B is provided around the light source
420B in the −Z-axis direction, and reflects the light emitted from the light source 420B to the
reflecting mirror 450B.
[0056]
The reflecting mirror 450B of the irradiation unit 400B is provided around the light source 420B
and diffuses the light emitted from the light source 420B toward the audible sound output
speaker 180 and the parametric speaker 280.
In the present embodiment, the reflecting mirror 450B has a conical shape whose diameter
increases in the + Z axis direction.
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[0057]
The moving unit 460B of the irradiating unit 400B is a mechanism that switches the irradiation
range of light by moving the light source 420B according to the output destination of the sound
switched by the output destination switching unit 130. In the present embodiment, the moving
unit 460B moves the light source 420B along the Z-axis direction based on the control signal
from the light adjusting unit 334 of the switching control unit 330. In the present embodiment,
the moving unit 460B is a mechanism that positions the light source 420B using a stepping
motor.
[0058]
As shown in FIG. 5, when the audible sound output speaker 180 is selected as the audio output
destination (wide-angle pointing), the moving unit 460B moves the light source 420B toward the
+ Z-axis direction to move the light source 420B and the reflector. A distance along the Z-axis
direction with the vertex of 450B is set as a distance LDw2 larger than the distance LDn2 at the
time of narrow angle directivity. As a result, the diffusion angle of the light emitted from the
reflecting mirror 450B becomes larger than in the narrow-angle direction, and the light is
irradiated to the first irradiation range LAw corresponding to the audible sound field range DAw
of the audible sound output speaker 180 .
[0059]
As shown in FIG. 6, when the parametric speaker 280 is selected as the audio output destination
(in narrow angle direction), the moving unit 460B moves the light source 420 closer to the -Z
axis direction, and the light source 420B and the reflecting mirror A distance along the Z-axis
direction with the vertex of 450 B is taken as a distance LDn smaller than the distance LDw at
the time of wide-angle pointing. As a result, the diffusion angle of the light emitted from the
reflecting mirror 450B becomes smaller than that in the wide-angle orientation, and the light is
irradiated to the second irradiation range LAn corresponding to the audible sound field range
DAn of the parametric speaker 280.
[0060]
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According to the second embodiment described above, it is possible to make the listener
recognize each audible sound field range of the audible sound output speaker 180 and the
parametric speaker 280 as in the first embodiment. Further, the correlation between the audible
sound field range DAw of the audible sound output speaker 180 and the first irradiation range
LAw, without inhibiting the reproduction of the sound by the audible sound output speaker 180
and the parametric speaker 280 by the irradiation unit 400B And the correlation between the
audible sound field range DAn of the parametric speaker 280 and the second irradiation range
LAn can be improved, respectively. Further, since the irradiation range of light is switched by
moving the light source 420B in the irradiation unit 400B, the irradiation range of light can be
easily switched between the first irradiation range LAw and the second irradiation range LAn.
[0061]
C. Other Embodiments The embodiments of the present invention have been described above,
but the present invention is not limited to these embodiments, and can be implemented in
various forms without departing from the spirit of the present invention. Of course.
[0062]
For example, in the first embodiment, the light irradiation range is changed by moving the light
source 420, but in another embodiment, the light irradiation is performed by moving at least one
of the light source 420, the convex lens 430, and the concave lens 440. You may change the
range. Further, in the second embodiment, the irradiation range of light is changed by moving
the light source 420B, but in another embodiment, the irradiation range of light is changed by
moving at least one of the light source 420B and the reflecting mirror 450B. You may.
[0063]
10, 10 B: Sound system 80: Audio device 110: Audio signal input unit 120: Audio signal
processing unit 130: Output destination switching unit 160: Signal amplifier 180: Audible sound
output speaker 240: Modulation unit 250: Ultrasonic oscillator 260: Signal Amplifier 280:
Parametric speaker 288: Ultrasonic transducer 310: Switching instruction input unit 330:
Switching control unit 334: Dimmer control unit 380: Notification unit 400, 400 B: Irradiation
unit 420, 420 B: Light source 422 B: Concave boundary 430: Convex lens 440 ... concave lens
450, 450B ... reflector 460, 460B ... moving part DAn ... audio sound field range DAw ... audio
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sound field range LAw ... first irradiation range LAn ... second irradiation range
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