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JP2013192045

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DESCRIPTION JP2013192045
Abstract: The present invention protects a listener's ear in an acoustic system that changes the
directivity of voice using a parametric speaker. A sound system (10) includes an audio sound
output speaker (180), a parametric speaker (280), an output destination switching unit (130) for
switching an audio output destination between the audio sound output speaker (180) and the
parametric speaker (280); When the object detection unit 430 detects the object 90 when
switching the output destination of the sound from the audible sound output speaker 180 to the
parametric speaker 280 when the object detection unit 430 detects the object 90 present in the
setting area SA1, And an arrival prevention unit 332 for preventing the arrival of ultrasonic
waves. [Selected figure] Figure 1
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 speaker (hereinafter, also referred to
as an “audible sound output speaker”) which outputs an audible sound wave to reproduce
sound, a parametric which outputs an ultrasonic wave to reproduce sound. A speaker is known
(for example, refer to patent documents 1-3).
09-05-2019
1
The sound pressure level of ultrasonic waves used for carrier waves in parametric speakers
exceeds approximately 110 decibels (dB), which is extremely large compared to the sound
pressure level of a general audio sound output speaker. The burden on the listener's ear to listen
to
[0003]
Patent Document 3 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.
[0004]
JP, 3-159400, A JP, 2011-135551, A JP, 2007-67514, A
[0005]
Conventionally, even when the listener is listening to the audio at the same place and volume, the
narrow-angle directivity is smaller than the sound pressure level of the audible sound wave from
the audible sound output speaker in the case of directivity in the wide-angle range. In this case,
sufficient consideration was not made about the fact that the sound pressure level of the
ultrasonic wave by the parametric speaker in this case becomes much larger.
In particular, since it is difficult for the listener to recognize from the listening voice whether the
sound is from the audible sound output speaker or the sound from the parametric speaker, it is
difficult for the listener to notice the parametric sound. There was a possibility that the listener's
ear would be strained by the ultrasonic waves from the speaker.
[0006]
The present invention aims to protect a listener's ear in an acoustic system which can change the
directivity of voice using a parametric speaker in view of the above-mentioned problems.
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2
[0007]
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.
[0008]
[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 sound, a
parametric speaker that outputs an ultrasonic wave and reproduces sound, and the audible
sound output speaker An output destination switching unit that switches an audio output
destination between the parametric speaker and an object present in a setting area set closer to
the parametric speaker among the arrival areas of the ultrasonic waves from the parametric
speaker When the object detection unit and the output destination switching unit switch the
output destination from the audible sound output speaker to the parametric speaker, the
ultrasonic wave reaches the object when the object detection unit detects the object. And a reach
preventing portion for preventing the
According to this application example, the directivity is changed from the wide-angle range to the
narrow-angle range by setting the region where the sound pressure level of the ultrasonic wave
by the parametric speaker is a level to be avoided for the person's ear. When making changes, it
is possible to prevent ultrasound at sound pressure levels that should be avoided for the person's
ear from reaching the listener's ear.
As a result, the listener's ear can be protected.
[0009]
Application Example 2 In the sound system of Application Example 1, the arrival prevention unit
prevents the arrival of the ultrasonic wave to the object by stopping the switching from the
audible sound output speaker to the parametric speaker. Also good. According to this application
example, it is possible to prevent the ultrasound of the sound pressure level to be avoided from
reaching the listener's ear while continuing the reproduction of the sound by the audible sound
output speaker 180.
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[0010]
Application Example 3 In the acoustic system according to Application Example 1 or Application
Example 2, the arrival prevention unit may prevent the arrival of the ultrasonic wave to the
object by suppressing the operation of the parametric speaker. . According to this application
example, it is possible to prevent the arrival of ultrasonic waves to the listener after switching the
parametric speaker to the audio output destination. The mode of suppressing the operation of
the parametric speaker includes stopping the parametric speaker and suppressing the sound
pressure level of the ultrasonic wave output from the parametric speaker.
[0011]
[Application Example 4] In the sound system according to any one of the application examples 1
to 3, the arrival prevention unit is configured to shield the space between the parametric speaker
and the object, thereby achieving the arrival of the ultrasonic wave to the object. You may
prevent it. According to this application example, it is possible to physically prevent the arrival of
ultrasonic waves to the listener after the parametric speaker 280 is switched to the audio output
destination.
[0012]
Application Example 5 In the acoustic system according to any one of Application Examples 1 to
4, a warning unit may be further provided that warns by at least one of voice and light when the
object detection unit detects the object. . According to this application example, it is possible to
warn listeners who are in the setting area to leave the parametric speaker.
[0013]
Application Example 6 The sound system according to any one of Application Examples 1 to 5
may further include a notification unit for notifying the output destination by at least one of
voice and light. According to this application example, according to this application example, it is
possible to notify the listener of the audio output destination.
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[0014]
The form of the present invention is not limited to the sound system, and may 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.
[0015]
It is an explanatory view showing composition of an acoustic system. It is explanatory drawing
which shows the outline | summary of the directional characteristic of an audible sound output
speaker and a parametric speaker. It is a flowchart which shows the switching control process at
the time of wide angle pointing which a switching control part performs. It is a flow chart which
shows narrow angle directional operation control processing which a change control part
performs. It is a flowchart which shows the switching control process at the time of narrow angle
pointing which a switching control part performs. It is an explanatory view showing the
composition of the sound system in a 2nd embodiment. It is explanatory drawing which shows
the structure of the shielding part in 2nd Embodiment. It is a flowchart which shows the
shielding control process at the time of narrow angle direction which a switching control part
performs in 2nd Embodiment.
[0016]
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.
[0017]
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
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5
generates sound. In the present embodiment, the sound system 10 is a device that generates
sound in a relatively wide space (for example, a park, a commercial facility, a station, a hall, a
house) including outdoors and indoors.
[0018]
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. As a result, the acoustic system 10 has directivity in the wide-angle
range with a relatively wide directivity angle (wide-angle directivity) by the audio sound output
speaker 180 and directivity in the narrow-angle range with a relatively narrow directivity angle
by the parametric speaker 280. It is possible to change the directivity of voice between (narrow
angle pointing).
[0019]
The audio signal input unit 110 of the audio system 10 receives an input of an audio signal from
the 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. Including.
[0020]
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.
[0021]
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6
The output destination switching unit 130 of the sound 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 for outputting the audio signal
between the audible sound output speaker 180 side and the parametric speaker 280 side. is
there.
[0022]
The signal amplifier 160 of the audio 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.
[0023]
An audible sound output speaker 180 of the sound system 10 is an apparatus that outputs an
audible sound wave to reproduce sound by converting a voice signal (electric signal) processed
by the signal amplifier 160 into a physical signal (physical vibration). is there.
The audible sound output speaker 180 is a dynamic type loudspeaker (Loudspeaker) in the
present embodiment, but may be another speaker such as a ribbon type or a condenser type in
other embodiments.
[0024]
The modulator 240 of the acoustic system 10 modulates the ultrasonic carrier wave signal
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.
[0025]
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7
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 by a
plurality of ultrasonic transducers 288, and reproduces audio in the audible range by the
parametric array effect. The number of ultrasonic transducers 288 is a total of 12 in 4 rows and
3 columns in the present embodiment, but may be smaller or larger than 12 in other
embodiments.
[0026]
In this embodiment, the carrier wave signal is amplitude-modulated in the modulation unit 240,
and an ultrasonic wave based on the amplitude-modulated carrier wave signal is generated in the
air by the parametric speaker 280. By this, the sound in the audible range is generated due to the
non-linear characteristic when the ultrasonic wave propagates in the air.
[0027]
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
are parametric. It may be simultaneously generated in the air by the speaker 280. This makes it
possible to generate audio in the audible range by the frequency difference between the two
ultrasonic waves.
[0028]
FIG. 2 is an explanatory view showing an outline of directivity characteristics of the audible
sound output speaker 180 and the parametric speaker 280. As shown in FIG. In FIG. 2, the
directional range DAw indicating the directional characteristics of the reproduced sound by the
audible sound output speaker 180 is hatched to the lower right. In FIG. 2, the directional range
DAn indicating the directional characteristic of the reproduced sound by the parametric speaker
280 is hatched to the left. The directivity range DAn of the parametric speaker 280 corresponds
to the arrival area of the ultrasonic wave from the parametric speaker 280.
09-05-2019
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[0029]
In the present embodiment, an audible sound output speaker 180 is disposed at the center of a
plane on which the ultrasonic transducers 288 in the parametric speaker 280 are juxtaposed. As
a result, the central axis of the directivity range DAw of the audio sound output speaker 180 and
the central axis of the directivity range DAn of the parametric speaker 280 substantially coincide
with the axis C.
[0030]
As shown in FIG. 2 as the directivity range DAw, the audible sound output speaker 180 has
directivity characteristics in a relatively wide wide-angle range. As shown as the directivity range
DAn in FIG. 2, the parametric speaker 280 has directivity characteristics in a relatively narrow
narrow-angle range. In this embodiment, in the range where the pointing range DAw and the
pointing range DAn overlap, the reproduced sound by the audible sound output speaker 180 and
the reproduced sound by the parametric speaker 280 are recognized as the sound of the same
sound pressure level at the same position. Adjusted to be done.
[0031]
In the sound system 10, in the directivity range DAn of the parametric speaker 280, the first
setting area SA1 and the second setting area SA2 are preset closer to the parametric speaker
280. The sound system 10 may vary variously depending on the presence of the object 90 (for
example, the person who is the listener, the head of the person, the ear of the person) in each of
the first setting area SA1 and the second setting area SA2. Perform the action of
[0032]
The first setting area SA1 is an area where the sound pressure level of ultrasonic waves by the
parametric speaker 280 is equal to or higher than the first threshold TH1, and is set closer to the
parametric speaker 280 than the boundary line BL1. The boundary line BL1 is a line connecting
the positions at which the sound pressure level of the ultrasonic wave is the first threshold TH1
in the first setting area SA1. The first threshold TH1 is 120 dB in the present embodiment, but
09-05-2019
9
may be a value smaller or larger than 120 dB in the other embodiments. In the present
embodiment, the first setting area SA1 is set as an area where the sound pressure level of the
ultrasonic wave by the parametric speaker 280 should be a level to be avoided with respect to
the person's ear.
[0033]
The second setting area SA2 is an area where the sound pressure level by the parametric speaker
280 is less than the first threshold value TH1 and greater than or equal to the second threshold
value TH2, and is set between the boundary line BL1 and the boundary line BL2. The boundary
line BL2 is a line connecting the positions at which the sound pressure level of the ultrasonic
wave is the second threshold TH2 in the second setting area SA2. The second threshold TH2 is
100 dB in the present embodiment, but may be smaller or larger than 100 dB in the other
embodiments.
[0034]
Returning to the description of FIG. 1, the acoustic system 10 further includes a switching
instruction input unit 310, a switching control unit 330, a notification unit 380, an object sensor
410, and an object detection unit 430.
[0035]
The object detection unit 430 of the acoustic system 10 exists in each of the first setting area
SA1 and the second setting area SA2 in the directivity area DAn of the parametric speaker 280
based on the sensor output from the object sensor 410. An object 90 is detected.
[0036]
In the present embodiment, the object sensor 410 is an ultrasonic detector, and the ultrasonic
transducer 288 of at least a part of the parametric speaker 280 transmits ultrasonic waves at a
smaller sound pressure level than ultrasonic waves for reproduced sound. The output is made,
and the reflected wave of the ultrasonic wave is detected by the object sensor 410.
The object detection unit 430 determines, based on the arrival time of the reflected wave
detected by the object sensor 410, the presence or absence of the object 90 present in each
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10
range of the first setting area SA1 and the second setting area SA2.
[0037]
The object sensor 410 and the object detection unit 430 may have any configuration as long as
they can detect the object 90 having a possibility of a person. In another embodiment, the object
sensor 410 is an infrared sensor, and the object is detected based on temperature. 90 may be
detected, or the object sensor 410 may be configured by an imaging device, and the object 90
may be detected based on image analysis.
[0038]
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
operator's voice, or the operator It may be a receiver that receives signals from equipment
handled by
[0039]
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 the reach prevention unit 332.
[0040]
When the output destination switching unit 130 switches the audio output destination from the
audible sound output speaker 180 to the parametric speaker 280, the arrival prevention unit
332 of the switching control unit 330 detects an object whose object detection unit 430 exists in
the first setting area SA1. When 90 is detected, the arrival of the ultrasonic wave to the object 90
09-05-2019
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is prevented. In the present embodiment, the arrival prevention unit 332 prevents the arrival of
ultrasonic waves to the object 90 present in the first setting area SA1 by stopping the switching
from the audible sound output speaker 180 to the parametric speaker 280.
[0041]
In the present embodiment, the function of the switching control unit 330 is 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.
[0042]
The notification unit 380 of the sound system 10 notifies information toward the directivity
range DAw of the audible sound output speaker 180 and the directivity range DAn of the
parametric speaker 280 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 rotary light, or the like, or may be a speaker capable
of notifying information by voice.
[0043]
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. If so, the notification unit 380 lights up the characters
“narrow angle”.
[0044]
In the present embodiment, when the object detection unit 430 detects an object 90 present in at
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least one of the first setting area SA1 and the second setting area SA2, the notification unit 380
warns the object 90 of the detection. It also functions as a department. In the present
embodiment, when operating the parametric speaker 280, when the object detection unit 430
detects the object 90, the notification unit 380 displays a warning to the effect that the
parametric speaker 280 is separated.
[0045]
A−2. Operation of Sound System: FIG. 3 is a flowchart showing the wide-angle pointing
switching control process (P100) executed by the switching control section 330. The wide-angle
directional switching control process (P100) is a process for switching the audio output
destination from the audible sound output speaker 180 to the parametric speaker 280. In this
embodiment, the switching control unit 330 switches the audio output destination to the audible
sound output speaker 180, and then executes the wide-angle directional switching control
process (P100).
[0046]
When the wide-angle directional switching control process (P100) is started, the switching
control unit 330 inputs an instruction to switch the audio output destination from the audible
sound output speaker 180 to the parametric speaker 280, ie, from wide-angle directional to
narrow-angle directional. It is determined whether a switching input has been accepted by
switching instruction input unit 310 (step S110). When there is no switching input to the
parametric speaker 280 (step S110: “NO”), the switching control unit 330 repeatedly
determines the presence or absence of the switching input to the audible sound output speaker
180 (step S110).
[0047]
When there is a switching input to the audible sound output speaker 180 (step S110: "YES"), the
switching control unit 330 determines whether the object detection unit 430 detects the object
90 present in the first setting area SA1. Is determined (step S120).
[0048]
When the object detection unit 430 detects the object 90 present in the first setting area SA1
(step S120: “YES”), the switching control unit 330 displays a warning display indicating that
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the object is separated from the parametric speaker 280. It instructs to 380 (step S122).
[0049]
After giving a warning (step S122), the switching control unit 330 operates as the arrival
prevention unit 332 to stop switching from the audible sound output speaker 180 to the
parametric speaker 280 (step S128), and narrow angle directional pointing It returns to the
process (step S110) which determines the presence or absence of the switch input to.
This can prevent the arrival of the ultrasonic wave to the object 90 present in the first set area
SA1.
[0050]
When the object detection unit 430 does not detect the object 90 present in the first setting area
SA1 (step S120: “NO”), the switching control unit 330 shifts the operation mode to the
switching confirmation mode (step S130). ).
This switching confirmation mode is an operation mode for confirming switching from the
audible sound output speaker 180 to the parametric speaker 280 again. In the present
embodiment, during the switching confirmation mode, the switching control unit 330 instructs
the notifying unit 380 to blink the characters “narrow angle”.
[0051]
When transitioning to the switching confirmation mode (step S130), the switching control unit
330 determines whether the switching instruction input unit 310 has accepted the switching
input to the parametric speaker 280 again (step S150).
[0052]
When there is no switching input to the parametric speaker 280 again (step S150: “NO”), the
switching control unit 330 determines whether or not the set time ST has passed since the mode
09-05-2019
14
transition to the switching confirmation mode (step S150). S160).
The setting time ST is 10 seconds in the present embodiment, but may be shorter or longer than
10 seconds in the other embodiments.
[0053]
When the set time ST has elapsed from the mode transition to the switching confirmation mode
(step S160: "YES"), the switching control unit 330 ends the switching confirmation mode and
determines the presence or absence of the switching input to the parametric speaker 280. The
process returns to step S110.
[0054]
If the set time ST has not elapsed since the mode transition to the switching confirmation mode
(step S160: “NO”), the switching control unit 330 repeatedly determines the presence /
absence of another switching input to the parametric speaker 280 (step S160). Step S150).
[0055]
If there is another switching input to the parametric speaker 280 (step S150: “YES”), the
switching control unit 330 switches the output destination of the audio from the audible sound
output speaker 180 to the parametric speaker 280 as an output destination switching unit It
instructs 130 (step S1 80).
As a result, switching of the output destination of sound from the wide-angle-oriented audible
sound output speaker 180 to the narrow-angle-oriented parametric speaker 280 is realized.
[0056]
After switching the audio output destination from the audible sound output speaker 180 to the
parametric speaker 280 (step S180), the switching control unit 330 ends the switching
confirmation mode, and “narrow angle” for the notification unit 380. The instruction to switch
from blinking display of the character to light display is given (step S190).
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15
As a result, notification that the output destination of the sound is the narrow angle directional
parametric speaker 280 is realized.
[0057]
After notifying the voice output destination (step S190), the switching control unit 330 ends the
wide-angle directional switching control process (P100).
[0058]
FIG. 4 is a flowchart showing the narrow-angle-pointing operation control process (P200)
executed by the switching control unit 330.
The narrow-angle directional operation control process (P200) is a process for controlling the
operation of the parametric speaker 280 selected as the audio output destination. In this
embodiment, after switching the audio output destination to the parametric speaker 280, the
switching control unit 330 repeatedly executes the narrow-angle directional operation control
process (P200) at a predetermined timing.
[0059]
When the narrow-angle directional operation control process (P200) is started, the switching
control unit 330 determines whether the object detection unit 430 detects the object 90 present
in the first setting area SA1 (step S210). ).
[0060]
When the object detection unit 430 detects the object 90 present in the first setting area SA1
(step S210: "YES"), the switching control unit 330 suppresses the operation of the parametric
speaker 280 (step S220). .
In the present embodiment, the switching control unit 330 suppresses the operation of the
parametric speaker 280 by stopping the operation of the parametric speaker 280. In another
embodiment, the switching control unit 330 may suppress the operation of the parametric
09-05-2019
16
speaker 280 by reducing the sound pressure level of the ultrasonic wave output from the
parametric speaker 280.
[0061]
After suppressing the operation of the parametric speaker 280 (step S220), the switching control
unit 330 instructs the notifying unit 380 to display a warning to the effect that the parametric
speaker 280 is separated (step S230). End (P200).
[0062]
When the object detection unit 430 does not detect the object 90 present in the first setting area
SA1 (step S210: “NO”), the switching control unit 330 causes the object detection unit 430 to
set the second setting area SA2. It is determined whether the existing object 90 is detected (step
S260).
[0063]
When the object detection unit 430 detects the object 90 present in the second setting area SA2
(step S260: “YES”), the switching control unit 330 displays a warning display indicating that
the object is separated from the parametric speaker 280. An instruction is issued to 380 (step
S280), and the narrow-angle-pointing operation control process (P200) is ended.
[0064]
When the object detection unit 430 does not detect the object 90 present in the second setting
area SA2 (step S260: “NO”), the switching control unit 330 permits the operation of the
parametric speaker 280 (step S290), The narrow-angle directional operation control process
(P200) is ended.
[0065]
FIG. 5 is a flowchart showing the narrow angle pointing switching control process (P300)
executed by the switching control unit 330.
The narrow-angle directional switching control process (P300) is a process for switching the
audio output destination from the parametric speaker 280 to the audible sound output speaker
180.
09-05-2019
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In the present embodiment, the switching control unit 330 executes narrow-angle directional
switching control processing (P300) after switching the audio output destination to the
parametric speaker 280.
[0066]
When narrow angle pointing switching control processing (P300) is started, the switching
control unit 330 instructs to switch the audio output destination from the parametric speaker
280 to the audible sound output speaker 180, ie, from narrow angle pointing to wide angle
pointing It is determined whether or not the switching instruction input is accepted by the
switching instruction input unit 310 (step S310).
When there is no switching input to the audible sound output speaker 180 (step S310: “NO”),
the switching control unit 330 repeatedly determines the presence or absence of the switching
input to the audible sound output speaker 180 (step S310).
[0067]
When there is a switching input to the audible sound output speaker 180 (step S310: "YES"), the
switching control unit 330 shifts the operation mode to the switching confirmation mode (step
S330).
This switching confirmation mode is an operation mode for confirming switching from the
parametric speaker 280 to the audible sound output speaker 180 again. In the present
embodiment, during the switching confirmation mode, the switching control unit 330 instructs
the notifying unit 380 to blink and display the characters “wide angle”.
[0068]
When transitioning to the switching confirmation mode (step S330), the switching control unit
330 determines whether the switching instruction input unit 310 has accepted the switching
input to the audible sound output speaker 180 again (step S350).
09-05-2019
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[0069]
If there is no switching input to the audible sound output speaker 180 again (step S 350:
“NO”), the switching control unit 330 determines whether or not the set time ST has elapsed
since the mode transition to the switching confirmation mode. (Step S360).
The setting time ST is 10 seconds in the present embodiment, but may be shorter or longer than
10 seconds in the other embodiments.
[0070]
If the set time ST has passed since the mode transition to the switching confirmation mode (step
S360: “YES”), the switching control unit 330 ends the switching confirmation mode, and the
presence or absence of the switching input to the audible sound output speaker 180 It returns to
the process (step S310) to judge.
[0071]
If the set time ST has not elapsed since the mode transition to the switching confirmation mode
(step S360: “NO”), the switching control unit 330 repeatedly determines the presence or
absence of switching input to the audible sound output speaker 180 again. (Step S350).
[0072]
When there is another switching input to the audible sound output speaker 180 (step S 350: “Y
ES”), the switching control unit 330 outputs the switching of the output destination of the audio
from the parametric speaker 280 to the audible sound output speaker 180. It instructs the
destination switching unit 130 (step S380).
As a result, switching of the output destination of the sound from the narrow angle directional
parametric speaker 280 to the wide angle directional audible sound output speaker 180 is
realized.
[0073]
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19
After switching the audio output destination from the parametric speaker 280 to the audible
sound output speaker 180 (step S 380), the switching control unit 330 ends the switching
confirmation mode, and “wide-angle” It instructs the transition from the blinking display of the
characters to the lighting display (step S390).
As a result, notification that the audio output destination is the wide-angle-oriented audible
sound output speaker 180 is realized.
[0074]
After notifying the voice output destination (step S390), the switching control unit 330 ends the
narrow angle pointing switching control process (P300).
[0075]
A−3.
Effect: In the first embodiment described above, the object 90 existing in the first setting area
SA1 in the wide-angle directional switching control process (P100) in which the audio output
destination is switched from the audible sound output speaker 180 to the parametric speaker
280. Is detected (step S120: “YES”), the switching from the audible sound output speaker 180
to the parametric speaker 280 is stopped (step S128), and the object 90 present in the first
setting area SA1 is detected. Prevent the arrival of ultrasound. By this, when changing the
directivity from the wide-angle range to the narrow-angle range, it is possible to prevent the
ultrasound of the sound pressure level that should be avoided from reaching the listener's ear. As
a result, the listener's ear can be protected.
[0076]
Also, by stopping the switching from the audible sound output speaker 180 to the parametric
speaker 280 (step S128), the audible sound output is prevented in order to prevent the
ultrasonic wave from reaching the object 90 present in the first setting area SA1. While
continuing the reproduction of sound by the speaker 180, it is possible to prevent ultrasound of
sound pressure level to be avoided for the person's ear from reaching the listener's ear.
09-05-2019
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[0077]
Further, after the wide-angle pointing switching control process (P100), when the object 90
present in the first setting area SA1 is detected in the narrow-angle operation control process
(P200) (step S21 0: "YES") By suppressing the operation of the parametric speaker 280 (step
S220), the arrival of the ultrasonic wave to the object 90 present in the first setting area SA1 is
prevented.
This makes it possible to prevent the arrival of ultrasonic waves to the listener after the
parametric speaker 280 is switched to the audio output destination.
[0078]
Further, according to the first embodiment, when the object 90 present in the first setting area
SA1 is detected (steps S210 and S210: “YES”), the user is separated from the parametric
speaker 280 using the notification unit 380. A warning can be issued to the listener in the first
setting area SA1 (steps S122 and S230).
[0079]
Further, according to the first embodiment, it is possible to notify the listener of the audio output
destination using the notification unit 380 (steps S190 and S390).
[0080]
B.
Second Embodiment In the description of the second embodiment, the same reference numerals
as in the first embodiment are used for the same components as in the first embodiment, but the
configuration, operation, and the like are different from those in the first embodiment. Uses a
code obtained by adding the English letter "B" to the code of the first embodiment.
[0081]
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21
FIG. 6 is an explanatory view showing the configuration of the sound system 10B in the second
embodiment.
The acoustic system 10B according to the second embodiment includes a shielding unit 500,
which is different in operation by the reach preventing unit 332B of the switching control unit
330B, in that the detection mode of the object 90 by the object sensor 410B and the object
detection unit 430B is different. Except for the same as the acoustic system 10 of the first
embodiment.
[0082]
In the second embodiment, the reaching prevention unit 332B of the switching control unit 330B
blocks the point between the parametric speaker 280 and the object 90 using the shielding unit
500, thereby preventing the arrival of the ultrasonic wave to the object 90. Except for this, it is
the same as the first embodiment. Details of the operation of the switching control unit 330B in
the second embodiment will be described later.
[0083]
In the second embodiment, the object sensor 410B and the object detection unit 430B are
configured to be able to detect not only the presence or absence of the object 90 in the first
setting area SA1 and the second setting area SA2, but also the position of the object 90. The
second embodiment is the same as the first embodiment except for the following points. In the
present embodiment, the object detection unit 430B detects the position of the object 90 based
on the distance to the object 90 and the direction in which the object 90 exists.
[0084]
The shielding unit 500 of the second embodiment is disposed on the emitting surface of the
ultrasonic wave in the parametric speaker 280, and is configured to be able to shield the first
setting area SA1 from the ultrasonic wave emitted from the parametric speaker 280. The
shielding unit 500 includes a plurality of shielding plates 520 configured to be rotatable. In the
present embodiment, the shielding plate 520 is formed of a material that promotes reflection and
09-05-2019
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scattering of ultrasonic waves. Although the number of shielding plates 520 is four in the present
embodiment, it may be at least more than four in other embodiments.
[0085]
FIG. 7 is an explanatory view showing the configuration of the shielding unit 500 in the second
embodiment. In the present embodiment, the shielding unit 500 includes a shielding window 510
corresponding to the emission surface of ultrasonic waves in the parametric speaker 280. Inside
the shielding window 510, a plurality of shielding plates 520 are rotatably provided side by side.
[0086]
FIG. 7A illustrates the shielding unit 500 in an open state in which all the plurality of shielding
plates 520 are substantially parallel to the axis C. In the state of FIG. 7A, the shielding unit 500
passes substantially all of the ultrasonic waves emitted from the parametric speaker 280 to the
first setting area SA1.
[0087]
FIG. 7B shows the shielding unit 500 in which all of the plurality of shielding plates 520 are in
the closed state substantially orthogonal to the axis C. In the state of FIG. 7B, the shielding unit
500 blocks substantially all of the ultrasonic waves emitted from the parametric speaker 280 to
the first setting area SA1.
[0088]
In the present embodiment, the shielding unit 500 is configured to be able to individually open
and close each of the plurality of shielding plates 520. As a result, the ultrasonic wave is allowed
to pass through the portion of the first setting area SA1 corresponding to the shielding plate 520
in the open state, and the ultrasonic wave is made to pass through the portion of the first setting
area SA1 corresponding to the shielding plate 520 in the closed state. Can block the ultrasound.
09-05-2019
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[0089]
FIG. 8 is a flowchart showing narrow-angle directional shielding control processing (P400)
performed by the switching control unit 330B in the second embodiment. The operation of the
switching control unit 330B of the second embodiment is the same as that of the first
embodiment except that the narrow angle pointing operation shielding control processing (P400)
is executed instead of the narrow angle pointing operation control processing (P200). It is. The
narrow-angle directional shielding control process (P400) is a process for controlling the
blocking of the ultrasonic wave by the blocking section 500. In the second embodiment, after
switching the audio output destination to the parametric speaker 280, the switching control unit
330B repeatedly executes narrow-angle directional shielding control processing (P400) at a
predetermined timing.
[0090]
When the narrow-angle directional shielding control process (P400) is started, the switching
control unit 330B determines whether the object detection unit 430B detects the object 90
present in the first setting area SA1 (step S410). .
[0091]
When the object detection unit 430B detects the object 90 present in the first setting area SA1
(step S410: “YES”), the switching control unit 330B determines, based on the detection signal
from the object detection unit 430B. The position of the object 90 in the first setting area SA1 is
confirmed (step S420).
[0092]
After confirming the position of the object 90 in the first setting area SA1 (step S420), the
switching control unit 330B performs a plurality of shieldings in the shielding unit 500
according to the position of the object 90 in the first setting area SA1. At least one of the plates
520 is controlled to be closed (step S430).
[0093]
After controlling the shielding plate 520 of the shielding unit 500 in the closed state (step S430),
the switching control unit 330B instructs the notifying unit 380 to display a warning to the effect
of leaving the parametric speaker 280 (step S440). The directional shielding control process
(P400) is ended.
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[0094]
When the object detection unit 430 does not detect the object 90 present in the first setting area
SA1 (step S410: "NO"), the switching control unit 330B controls all the shielding plates 520 in
the shielding unit 500. Control is made to the open state (step S480), and the narrow-angle
directional shielding control process (P400) is ended.
[0095]
In the second embodiment described above, as in the first embodiment, when the directivity is
changed from the wide-angle range to the narrow-angle range, an ultrasonic wave of a sound
pressure level to be avoided is heard from the person's ear. It can prevent reaching the ear of the
elderly.
As a result, the listener's ear can be protected.
[0096]
Further, after the wide-angle directional switching control process (P100), when the object 90
present in the first setting area SA1 is detected in the narrow-angle directional shielding control
process (P400) (step S410: “YES ), And prevents the arrival of ultrasonic waves to the object 90
present in the first setting area SA1 by shielding between the parametric speaker 280 and the
object 90 (step S430).
This makes it possible to physically prevent the arrival of ultrasound to the listener after the
parametric speaker 280 is switched to the audio output destination.
[0097]
C.
Other Embodiments The embodiments of the present invention have been described above, but
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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.
[0098]
For example, in the present embodiment, detection of the object 90 is performed in both the first
setting area SA1 and the second setting area SA2, but in the other embodiments, the object 90 is
detected only in the first setting area SA1. The detection of may be performed.
[0099]
Further, in the present embodiment, in the wide-angle directional switching control process
(P100), the audio output destination is switched (step S180) according to the second switching
input (step S150: "YES"). In the second embodiment, switching of the output destination of the
sound (step S180) may be performed according to the confirmation that the object 90 is not
present in the first setting area SA1 (step S120: "NO").
[0100]
Further, in the present embodiment, in the narrow-angle directional switch control process
(P300), the voice output destination is switched (step S380) according to the second switching
input (step S350: “YES”). In another embodiment, switching of an audio output destination
(step S380) may be performed according to the first switching input (step S310: "YES").
[0101]
10, 10 B: Sound system 80: Audio device 90: Object 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, 330B:
Switching control unit 332, 332B: Arrival prevention unit 380: Notification unit 410, 410B ...
Object sensor 430, 430B ... Object detection Part 500 ... Shielding part 510 ... Shielding window
520 ... Shielding plate SA1 ... First setting area SA2 ... Second setting area BL1 ... Boundary line
BL2 ... Boundary line DAn ... Directional range DAw ... Directional range
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