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DESCRIPTION JP2007282191

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DESCRIPTION JP2007282191
[PROBLEMS] To provide a guidance device capable of voice guidance by either a sound giving
directivity or a sound not giving directivity. SOLUTION: A carrier wave oscillator 10 which
generates and outputs a carrier wave of an ultrasonic frequency band, a modulator 11 which
modulates the carrier wave of an ultrasonic frequency band with an audio signal of an audio
frequency band to be inputted, the modulated signal Switch means 13 for switching to an input
audio signal, a directional speaker, and an ultrasonic transducer 15 driven by the signal output
from the switch means 13 to reproduce a signal sound, attribute data and audio data Audio
guidance information which is a content including the above, and outputs the audio data as an
audio signal to the modulator 11 and the switch means 13, and determines the attribute of the
audio guidance information, and the first operation according to the attribute And an attribute
discriminator 12 for controlling the switch means 13 to switch between the mode and the second
operation mode. [Selected figure] Figure 1
Guidance device and control method therefor
[0001]
The present invention relates to a guidance apparatus using a directional speaker capable of
reproducing very directional sound and a control method thereof.
[0002]
With the development and spread of information devices, modern society, especially public
spaces, are flooded with various sounds emitted from various information devices.
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1
However, unwanted voices and announcements cause great stress, such as confusion and
discomfort for individuals who do not need them. Under such circumstances, especially in public
spaces, there has recently been a growing demand to further improve the sound environment,
such as reducing noise to the surroundings. For example, in applications such as advertising and
announcements, if it is possible to provide audio information only in a specific area (area on
demand), noise to the surroundings can be reduced and at the same time an improvement in the
announcement effect can be expected.
[0003]
By the way, in applications such as voice guidance and voice-based advertising, it is desirable to
provide guidance information only to a specific individual or area (information with high privacy)
and to announce in a relatively wide space area There are two ways to do it (when information is
highly public). On the other hand, with regard to the former, in particular, a directional speaker
capable of reproducing sound having high directivity such as an ultrasonic speaker (see Patent
Document 1) has attracted attention. The ultrasonic speaker is capable of reproducing sound
with high directivity by outputting a modulated wave obtained by modulating a carrier wave in
the ultrasonic band with an acoustic signal in the audible band. It is used for local
announcements. In addition, recently, there is also a guidance robot that changes information
(content) to be provided (provided) according to the situation (see Patent Document 2). JP, 2002204492, A JP, 7-295,637 A
[0004]
However, since the speaker in the conventional guidance device and robot can only realize either
a directional speaker or a loudspeaker, both requirements can not be satisfied at the same time.
Although this can be realized by mounting the directional speaker system and the loudspeaker
system, in that case, there is a problem that the size of the system is increased by the size of each
speaker and the drive circuit, and the cost is also increased.
[0005]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide voice guidance by either a very directional sound (directional
speaker) or a low directional sound (loudspeaker). It is an object of the present invention to
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2
provide a guidance device capable of switching the provision form according to the situation and
a control method thereof.
[0006]
In order to achieve the above object, the guidance device of the present invention is
characterized in that the directivity of the sound reproduced from the speaker is controlled
according to the attribute of the content.
The guide apparatus of the present invention having the above configuration uses a speaker (for
example, a directional speaker using an ultrasonic transducer) capable of simultaneously
reproducing the sound giving directivity and the sound not giving directivity. The operation
mode for reproducing the sound with directivity given according to the attribute of the content
and the operation mode for playing the sound without directivity are switched for reproduction.
Therefore, it is possible to switch between the function as a directional speaker and the function
as a loudspeaker according to the attribute of voice guidance as needed. Therefore, when
providing guidance information, the receiver side is confused. And prevent false recognition. (2)
It is possible to give guidance in consideration of the position of the person being guided, and to
increase the sense of security. (3) Effects such as being able to reduce noise given to the
surroundings can be obtained. Moreover, since the function as a directional speaker and the
function as a loudspeaker can be realized by one speaker, the system of the guiding device can
be miniaturized.
[0007]
Further, in the guiding device of the present invention, a carrier wave generating means for
generating and outputting a carrier wave in an ultrasonic frequency band, and a voice in an audio
frequency band to which the carrier wave in the ultrasonic frequency band outputted from the
carrier wave generating means is input. A modulation unit that modulates with a signal, a switch
unit that switches and outputs a modulation signal output from the modulation unit, and an
audio signal that is input, and a first operation mode that reproduces sound with directivity. An
ultrasonic transducer operable in both of the second operation mode for reproducing a sound not
imparting directivity and driven by a signal output from the switch means, and an attribute data
and voice data for reproducing a signal sound And output the voice data as a voice signal to the
modulation means and the switch means, and an attribute of the voice guidance information. And
another, in accordance with the attributes, to said first operation mode, the attribute
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discrimination means for controlling said switching means to switch between the second
operation mode, comprising: a. In the guiding apparatus of the present invention having the
above configuration, the carrier wave of the ultrasonic frequency band is generated by the
carrier wave generating means, and the carrier wave of the ultrasonic frequency band outputted
from the carrier wave generating means is modulated by the modulation means. It is modulated
by an audio signal. The switch means switches between the modulation signal output from the
modulation means and the audio signal to be output. The ultrasonic transducer can operate in
both the first operation mode (the operation mode for reproducing as directivity sound) and the
second operation mode (the second operation mode for reproducing as directivity sound) It is
driven by a signal output from the switch means to reproduce a signal sound. Further, the
attribute determination means receives voice guidance information which is content including
attribute data and voice data, outputs the voice data as a voice signal to the modulation means
and the switch means, and at the same time, attributes of the voice guidance information. And
control the switch means to switch the signal supplied to the ultrasonic transducer by switching
between the first operation mode and the second operation mode according to the attribute.
Therefore, it is possible to switch between the function as a directional speaker and the function
as a loudspeaker according to the attribute of voice guidance as needed. Therefore, when
providing guidance information, the receiver side is confused. And prevent false recognition. (2)
It is possible to give guidance in consideration of the position of the person being guided, and to
increase the sense of security.
(3) Effects such as being able to reduce noise given to the surroundings can be obtained.
Moreover, since the function as a directional speaker and the function as a loudspeaker can be
realized by one speaker, the system of the guiding device can be miniaturized.
[0008]
Further, in the guidance device of the present invention, the ID held by the individual or the ID
identification means for identifying a specific space, and the voice guidance information
previously associated with each ID are stored, and the ID identification means Voice guidance
information output means for outputting voice guidance information corresponding to the
identified ID to the attribute determination means, and position identification means for
identifying a position where the ID identified by the ID identification means is present, and
outputting a position command And an actuator for controlling the sound radiation direction of
the ultrasonic transducer to coincide with the direction of the position where the ID identified by
the ID identifying unit is based on the position command output from the position identifying
unit. And the like. In the guidance apparatus of the present invention having the above
configuration, the ID identification means identifies an ID held by an individual or a specific
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space. The voice guidance information output means stores voice guidance information
associated in advance with each ID, and outputs voice guidance information corresponding to the
ID identified by the ID identification means to the attribute discrimination means. Further, the
position identification means identifies the position where the ID identified by the ID
identification means is present, and the position identification means outputs a position
command to an actuator that controls the sound emission direction of the ultrasonic transducer.
The actuator is configured such that the sound radiation direction of the ultrasonic transducer
matches the direction of the position where the ID identified by the ID identifying unit is based
on the position command output from the position identifying unit. Drive control. Therefore, with
the movement of the voice guidance target person, the voice guidance beam can accurately
follow the voice guidance target person, and efficient voice guidance can be performed.
[0009]
Further, in the guiding device of the present invention, a carrier wave generating means for
generating and outputting a carrier wave in an ultrasonic frequency band, and a voice in an audio
frequency band to which the carrier wave in the ultrasonic frequency band outputted from the
carrier wave generating means is input. Voice guidance information which is content including
modulation means for modulating with a signal, level adjustment means for adjusting a level ratio
of the modulation signal outputted from the modulation means and the audio signal, and content
including audio data and attribute data The voice data is output as a voice signal to the
modulation means and the level adjustment means, and the attribute of the voice guidance
information is determined, and the level ratio between the modulation signal and the voice signal
is changed according to the attribute. Attribute discrimination means for generating a level ratio
command to output to the level adjustment means, and a modulation signal whose level is
adjusted by the level adjustment means; A mixer that synthesizes a voice signal and outputs a
synthetic wave, and a sound that gives directivity and a sound that does not give directivity can
be reproduced, and are driven by signals output from the mixer to produce a signal sound. And
an ultrasonic transducer for reproducing. In the guiding apparatus of the present invention
having the above configuration, the carrier wave of the ultrasonic frequency band is generated
by the carrier wave generating means, and the carrier wave of the ultrasonic frequency band
outputted from the carrier wave generating means is modulated by the modulation means. It is
modulated by an audio signal. Further, the level adjustment means adjusts the level ratio between
the modulation signal output from the modulation means and the audio signal output from the
attribute determination means, and the mixer adjusts the level of the modulation signal and the
audio signal by the level adjustment means. And a synthesized wave is generated. The ultrasonic
transducer is capable of reproducing both directional sound and non-directional sound, and is
driven by the synthetic wave signal output from the mixer to reproduce the signal sound.
Further, the attribute determination means generates a level ratio command so as to change the
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level ratio of the modulation signal and the audio signal based on the attribute information, and
outputs the level ratio command to the level adjustment means. Therefore, the directivity angle of
the audio output can be changed by adjusting the level of the modulation signal and the level of
the audio signal. When the ratio of the modulation signal is high, the directivity is high, and when
the ratio of the audio signal is high, the directivity is low. Further, the directivity angle of the
voice output can be adjusted in consideration of the attribute of the voice guidance information
(content).
[0010]
Further, in the guidance device of the present invention, an ID held by an individual or an ID
identification means for identifying a specific space, and voice guidance information previously
associated with each ID are stored, and identification is performed by the ID identification means
Voice guidance information output means for outputting voice guidance information
corresponding to the ID to the attribute determination means, position identification means for
identifying a position where the ID identified by the ID identification means is present, and
outputting a position command And an actuator configured to control the sound radiation
direction of the ultrasonic transducer based on the position command output from the position
identification means to coincide with the direction of the position where the ID identified by the
ID identification means is present. It is characterized by In the guidance apparatus of the present
invention having the above configuration, the ID identification means identifies an ID held by an
individual or a specific space. The voice guidance information output means stores voice
guidance information associated in advance with each ID, and outputs voice guidance
information corresponding to the ID identified by the ID identification means to the attribute
discrimination means. Further, the position identification means identifies the position where the
ID identified by the ID identification means is present, and the position identification means
outputs a position command to an actuator that controls the sound emission direction of the
ultrasonic transducer. The actuator is configured such that the sound radiation direction of the
ultrasonic transducer matches the direction of the position where the ID identified by the ID
identifying unit is based on the position command output from the position identifying unit.
Drive control. Therefore, with the movement of the voice guidance target person, the voice
guidance beam can accurately follow the voice guidance target person, and efficient voice
guidance can be performed. Furthermore, the directivity angle of the audio output can be
changed by adjusting the level of the modulation signal and the level of the audio signal. When
the ratio of the modulation signal is high, the directivity is high, and when the ratio of the audio
signal is high, the directivity is low. For example, as the ID (voice guidance target person)
approaches the position of the guiding device of the present invention, the level of the
modulation signal (directional sound) is lowered to operate to raise the level of the voice signal
(low directional sound). Thus, it is possible to prevent the voice guidance beam from being
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separated from the person to be guided with the movement of the person to be voice guidance,
and to provide effective voice guidance. Further, the directivity angle of the voice output can be
adjusted in consideration of the attribute of the voice guidance information (content).
[0011]
Further, in the guidance device of the present invention, the position identification means
outputs ID information output from the ID identification means and the attribute identification
means instead of the attribute discrimination means generating the level ratio command. The
level ratio command is generated based on the attribute information to be output, and is output
to the level adjustment unit. In the guidance apparatus of the above configuration, the position
identification means changes the level ratio between the modulation signal and the audio signal
based on the ID information output from the ID identification means and the attribute
information output from the attribute determination means. A ratio command is generated and
output to the level adjustment means. Therefore, the position identification means can detect the
position of the ID (voice guidance target person) and generate the level ratio command according
to the position and the attribute of the ID.
[0012]
Further, the control method of the guidance apparatus of the present invention is characterized
in that the directivity of the sound reproduced from the speaker is controlled according to the
attribute of the content. In the method of controlling the guiding apparatus of the present
invention including the above procedure, a speaker (for example, a directional speaker using an
ultrasonic transducer) capable of simultaneously reproducing the sound providing directivity and
the sound not providing directivity is used. According to the attribute of the content to be
reproduced, the operation mode for reproducing the sound with directivity given and the
operation mode for playing the sound without directivity given are switched and reproduced.
Therefore, it is possible to switch between the function as a directional speaker and the function
as a loudspeaker according to the attribute of voice guidance as needed. Therefore, when
providing guidance information, the receiver side is confused. And prevent false recognition. (2)
It is possible to give guidance in consideration of the position of the person being guided, and to
increase the sense of security. (3) Effects such as being able to reduce noise given to the
surroundings can be obtained. Moreover, since the function as a directional speaker and the
function as a loudspeaker can be realized by one speaker, the system of the guiding device can
be miniaturized.
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7
[0013]
Further, in the control method of the guiding device according to the present invention, a carrier
wave generating procedure for generating and outputting a carrier wave in an ultrasonic
frequency band, and an audio frequency to which the carrier wave in the ultrasonic frequency
band generated by the carrier wave generation procedure is input A modulation procedure for
modulating with an audio signal in a band, a switching procedure for switching and outputting a
modulation signal output from the modulation procedure, and an input audio signal, and a first
operation for reproducing directional sound A step of reproducing an audible signal by driving
an ultrasonic transducer operable in both of the mode and the second operation mode for
reproducing a non-directivity sound with a signal output from the switch procedure; Voice
guidance information including attribute data and voice data is input, and the voice data is output
as a voice signal to the modulation procedure and the switch procedure, and the voice plan It is
characterized by including an attribute determination procedure of determining the attribute of
the information and controlling the switch procedure to switch between the first operation mode
and the second operation mode according to the attribute. . In the control method of the
guidance apparatus of the present invention including the above-described procedure, the carrier
wave of the ultrasonic frequency band is generated by the carrier wave generation procedure. In
the modulation procedure, the carrier wave of the ultrasonic frequency band generated by the
carrier wave generation procedure is modulated by the audio signal of the input audio frequency
band. In the switch procedure, the modulation signal output from the modulation procedure and
the input audio signal are switched and output. The ultrasonic transducer is operable in both the
first operation mode (the operation mode for reproducing as directivity sound) and the second
operation mode (the operation mode for reproducing as directivity sound). Driven by a signal
output from the switching procedure to reproduce a signal sound. In the attribute determination
procedure, voice guidance information which is content including attribute data and voice data is
input, and the voice data is output as a voice signal to the modulation procedure and the switch
procedure, and the attributes of the voice guidance information And control the switch procedure
to switch the signal supplied to the ultrasonic transducer by switching between the first
operation mode and the second operation mode according to the attribute. Therefore, it is
possible to switch between the function as a directional speaker and the function as a
loudspeaker according to the attribute of voice guidance as needed. Therefore, when providing
guidance information, the receiver side is confused. And prevent false recognition.
(2) It is possible to give guidance in consideration of the position of the person being guided, and
to increase the sense of security. (3) Effects such as being able to reduce noise given to the
surroundings can be obtained. Moreover, since the function as a directional speaker and the
function as a loudspeaker can be realized by one speaker, the system of the guiding device can
10-04-2019
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be miniaturized.
[0014]
Further, in the control method of the guiding device according to the present invention, a carrier
wave generating procedure for generating and outputting a carrier wave in an ultrasonic
frequency band, and an audio frequency to which the carrier wave in the ultrasonic frequency
band generated by the carrier wave generation procedure is input Voice guidance information
which is content including a modulation procedure for modulating with an audio signal in a band,
a level adjustment procedure for adjusting a level ratio of the modulation signal output from the
modulation procedure and the audio signal, and content including attribute data and audio data
Is input as the audio signal to the modulation procedure and the level adjustment procedure, and
an attribute of the audio guidance information is determined, and the level of the modulation
signal and the audio signal is determined according to the attribute. An attribute determination
procedure for generating a level ratio command so as to change the ratio and outputting it to the
level adjustment procedure, and level adjustment by the level adjustment procedure A mixer
procedure which combines a modulation signal and an audio signal to output a synthetic wave,
and an ultrasonic transducer capable of reproducing both a sound giving directivity and a sound
not giving directivity are outputted by the mixer procedure Driving with a signal to reproduce a
signal sound. In the control method of the guidance apparatus of the present invention including
the above-described procedure, the carrier wave of the ultrasonic frequency band is generated by
the carrier wave generation procedure. In the modulation procedure, the carrier wave of the
ultrasonic frequency band generated by the carrier wave generation procedure is modulated by
the audio signal of the input audio frequency band. The level adjustment procedure adjusts the
level ratio between the modulation signal output from the modulation procedure and the audio
signal output from the attribute determination procedure. Further, the attribute determination
procedure generates a level ratio command so as to change a level ratio of the modulation signal
and the audio signal based on attribute information, and controls the level adjustment procedure.
The mixer procedure combines the level-adjusted modulation signal and the voice signal
according to the level adjustment procedure to generate a composite wave. The ultrasonic
transducer is capable of reproducing both directional sound and non-directional sound, and is
driven by the synthetic wave signal output from the mixer procedure to reproduce the signal
sound. Therefore, the directivity angle of the audio output can be changed by adjusting the level
of the modulation signal and the level of the audio signal. When the ratio of the modulation
signal is high, the directivity is high, and when the ratio of the audio signal is high, the directivity
is low. Further, the directivity angle of the voice output can be adjusted in consideration of the
attribute of the voice guidance information (content).
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[0015]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. The guidance device according to the present invention includes a first operation
mode for reproducing a highly directional sound (sound with directivity) and a second operation
for reproducing a low directivity sound (sound without directivity). A guidance apparatus having
an operation mode, including directional speakers that can be reproduced simultaneously in the
first and second operation modes, and performing voice guidance, wherein the guidance device
performs the above-mentioned according to the attribute of the content reproduced from the
directional speaker It is characterized in that reproduction is performed by switching between
the first operation mode and the second operation mode. According to the present invention, the
first operation mode (directional speaker mode) and the second operation mode (loudspeaker
mode) are selected according to the attribute of the content (audio information) output from the
directional speaker and the provision target. It becomes possible to switch and perform audio
guidance.
[0016]
First Embodiment The configuration of a guiding device according to a first embodiment of the
present invention is shown in FIG. In the figure, the guiding device according to the first
embodiment of the present invention has a carrier wave oscillator 10, a modulator 11, an
attribute discriminator 12, a switch means 13, a power amplifier 14, and an ultrasonic
transducer 15. doing.
[0017]
The carrier oscillator 10 has a function of generating a carrier in the ultrasonic frequency band.
The modulator 11 has a function of modulating the carrier wave of the ultrasonic frequency band
output from the carrier wave oscillator 10 with the audio signal of the audio frequency band. The
switch means 13 has a function of switching between the modulation signal output from the
modulator 11 and the input audio signal based on the output of the attribute discriminator 12
described later. Voice guidance information, which is content including attribute data and voice
data, is input to the attribute discriminator 12, and the attribute discriminator 12 outputs voice
data of the voice guidance information as a voice signal to the modulator 11 and the switch
means 13 And a switch for switching the signal supplied to the ultrasonic transducer 15 by
switching between the first operation mode and the second operation mode according to the
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attribute. It has a function of controlling the means 13.
[0018]
The power amplifier 14 has a function of amplifying the power of the output of the switch means
13 to a predetermined level. The ultrasonic transducer 15 is driven by a signal output from the
switch means 13 and reproduces a signal sound. The carrier wave oscillator 10 corresponds to
the carrier wave generation means of the present invention, the modulator 11 corresponds to the
modulation means of the present invention, and the attribute discriminator 12 corresponds to
the attribute discrimination means of the present invention.
[0019]
In the above configuration, the carrier wave of the ultrasonic frequency band is generated by the
carrier wave oscillator 10 and is input to one input end of the modulator 11. On the other hand,
voice guidance information (content) including attribute data and voice data is input to the
attribute discriminator 12, and the attribute discriminator 12 uses the voice data in the voice
guidance information as the voice signal to input the other input of the modulator 11. Output to
the switching terminal 13 a of the end and the switch means 13.
[0020]
The modulator 11 modulates the carrier wave of the ultrasonic frequency band output from the
carrier wave oscillator 10 with the audio signal input from the attribute discriminator 12, and
outputs the modulated signal to the switching terminal 13 b of the switch means 13. Further, the
attribute discriminator 12 discriminates the attribute of the voice guidance information based on
the attribute data in the voice guidance information, and the directivity is low in the first
operation mode for reproducing the high directivity sound according to the attribute. The switch
means 13 is controlled to switch between the second operation mode for reproducing sound and
the signal supplied to the ultrasonic transducer 15.
[0021]
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11
In the present embodiment, the voice guidance information (content) has two types of access
rights, private and public, as attributes, and when the voice guidance information is specific
personal information, the access right is private and the voice guidance is When the information
is shared information of the general public, it is associated with being public, and when the
attribute of the voice guidance information is private, it is reproduced in the first operation mode
and the attribute of the voice guidance information Is public, the reproduction is performed in
the second operation mode. That is, when the attribute data (access right) of the voice guidance
information is private, the switch means 13 is on the switching terminal 13b side so that the
reproduction is performed in the first operation mode, and the attribute data is public. In order to
switch the switch means 13 to the switching terminal 13a side, the switch means is controlled.
[0022]
The modulated signal or audio signal output from the switch means 13 is power amplified to a
predetermined level by the power amplifier 14 and output to the ultrasonic transducer 15. The
ultrasonic transducer 15 is driven by the output of the power amplifier 14 to reproduce a signal
sound. When the attribute of voice guidance information is private, it can be announced only to a
specific individual or a specific space area, and when the attribute of voice guidance information
is public, it can announce to a relatively wide space area.
[0023]
According to the guidance device according to the first embodiment, the function as the
directional speaker and the function as the loudspeaker can be switched as needed according to
the attribute of the voice guidance. (1) Guidance information Can be used to prevent the receiver
from being confused or misidentified. (2) It is possible to give guidance in consideration of the
position of the person being guided, and to increase the sense of security. (3) Effects such as
being able to reduce noise given to the surroundings can be obtained. In addition, since the
function as a directional speaker and the function as a loudspeaker can be realized by one unit,
the system of the guiding device can be miniaturized.
[0024]
Next, an example of the structure of an electrostatic ultrasonic transducer suitable for use as an
ultrasonic transducer in each embodiment of the present invention is shown in FIG. FIG. 2A
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12
shows a cross section of the electrostatic ultrasonic transducer 15, which is provided so as to
face the respective surfaces of the vibrating membrane 22 having the conductive layer (vibrating
membrane electrode) 221 and the vibrating membrane 22. It has a pair of fixed electrodes
consisting of the front side fixed electrode 20A and the back side fixed electrode 20B (When both
the front side fixed electrode 20A and the back side fixed electrode 20B are referred to, it is
called the fixed electrode 20). As shown in FIG. 2A, the vibrating film 22 may be formed so that
the conductive layer (vibrating film electrode) 221 forming the electrode is sandwiched by the
insulating film 220, or the whole vibrating film is formed of a conductive material. You may do
so.
[0025]
Further, a plurality of through holes 24A are provided in the front side fixed electrode 20A
sandwiching the diaphragm 22, and a position opposite to each through hole 24A provided in
the front side fixed electrode 20A in the back side fixed electrode 20B. The through holes 24B of
the same shape are provided in the same (in the case where both the through holes 24A and the
through holes 24B are referred to as the through holes 24). The front side fixed electrode 20A
and the back side fixed electrode 20B are supported by the supporting member 21 with a
predetermined gap from the vibrating membrane 22, respectively, and as shown in FIG. 2A, the
vibrating membrane 22 and the fixed electrode 20 The support member is formed such that the
two members face each other via a gap. FIG. 2 (B) shows the one-side planar appearance of the
electrostatic ultrasonic transducer 15 (in a state where a portion of the fixed electrode 20 is cut
away), and the plurality of through holes 24 are arranged in a honeycomb shape There is. FIG. 2C
is a plan view of the fixed electrode to which the support member is joined, and shows a state
where the fixed electrode 20 side is just seen from the vibrating film 22 side of the electrostatic
ultrasonic transducer. The support member 21 is made of an insulating material, and can be
formed, for example, by pattern-printing the insulating material on the surface of the fixed
electrode 20 (the side facing the vibrating film 22) in the same manner as resist printing on a
printed substrate.
[0026]
With the above-described configuration, alternating-current signals 28A and 28B having the
same amplitude and opposite phases to each other are applied to the front fixed electrode 20A
and the back fixed electrode 20B of the electrostatic ultrasonic transducer 15. Further, a DC bias
voltage is applied to the diaphragm electrode 221 by the DC power supply 26. Thus, the
diaphragm 22 is applied by applying a DC bias voltage to the diaphragm electrode 221 and
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13
applying drive signals (AC signals) whose phases are inverted to each other on the front fixed
electrode 20A and the back fixed electrode 20B. Electrostatic attraction and electrostatic
repulsion simultaneously act in the same direction. Every time the polarity of the drive signal (AC
signal) is reversed, the vibrating film 22 is push-pull driven because the direction in which the
electrostatic attraction force and the electrostatic repulsion force act is changed. As a result, the
sound waves generated by the diaphragm are emitted to the outside through the through holes
24 provided in the front fixed electrode 20A and the back fixed electrode 20B.
[0027]
The electrostatic transducer as described above is characterized in that it has a broad sound
pressure-frequency characteristic in the ultrasonic frequency band as shown in FIG. The
electrostatic ultrasonic transducer has a certain degree of sound pressure sensitivity even in the
audio frequency band as shown in FIG. 3 because the frequency characteristic does not change
sharply unlike the piezoelectric ultrasonic transducer. Therefore, when a signal in the audio
frequency band is directly input to the electrostatic ultrasonic transducer, it also functions as a
loudspeaker that directly emits sound in the audio frequency band.
[0028]
Second Embodiment The configuration of a guiding device according to a second embodiment of
the present invention is shown in FIG. The guide apparatus according to the second embodiment
of the present invention is different from the guide apparatus according to the first embodiment
in the configuration of the guide apparatus according to the first embodiment shown in FIG. A
discriminator 22, a voice guidance information database 21, and an actuator 23 are further
provided, so that the provision form and the provision direction of voice guidance can be
appropriately changed according to the attribute of the identified ID and the position where the
ID exists. The configuration is the same, and the other configurations are the same as those of the
guiding device according to the first embodiment. Therefore, the same components are denoted
by the same reference numerals, and redundant description will be omitted.
[0029]
The guiding apparatus according to the second embodiment of the present invention includes a
carrier wave oscillator 10, a modulator 11, an attribute discriminator 12, a switch means 13, a
power amplifier 14, an ultrasonic transducer 15, and an ID discriminator 20. , Voice guidance
information database 21, position identifier 22, and actuator 23.
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14
[0030]
The ID discriminator 20 includes, for example, an RF-ID discriminator, a wireless LAN, etc., and
identifies an ID held by an individual or a specific space.
The position discriminator 22 identifies or measures the position where the ID identified by the
ID discriminator exists, and outputs a position command to an actuator described later. For
example, in a scene (a ticket gate or the like) in which a plurality of RF-ID reading terminals are
installed, the position of each reading terminal is registered in advance in the position
identification device, and the terminals from which reading is performed are identified. The
position can be configured to command the actuator. Alternatively, the position may be identified
by measuring an area where an ID (for example, a portable terminal) exists using a wireless LAN.
[0031]
The voice guidance information database 21 stores voice guidance information previously
associated with each ID, and is configured to output voice guidance information corresponding to
the ID identified by the ID discriminator 20 to the attribute discriminator 12 It is done. FIG. 5
shows an example of the voice guidance information database 21. Data indicating ID, attribute
data of voice guidance information, and voice data to be output are stored in association with
each other.
[0032]
The actuator 23 has a function of controlling the sound radiation direction of the ultrasonic
transducer 15, and the sound radiation direction of the ultrasonic transducer 15 is identified by
the ID identifier 20 based on the position command output from the position identifier 22. The
ultrasonic transducer 15 is drive-controlled to coincide with the direction of the position where
the ID is present. That is, the actuator 23 controls the sound emission direction of the ultrasonic
transducer 15 so that the sound wave (particularly directional sound) reaches the position where
the ID is present, in accordance with the position command output from the position
discriminator 22. It is configured.
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[0033]
The ID discriminator 20 corresponds to the ID discriminator of the present invention, the voice
guidance information database 21 to the voice guidance information output means of the present
invention, and the position discriminator 22 to the position discriminator of the present
invention.
[0034]
In the above configuration, the carrier wave of the ultrasonic frequency band is generated by the
carrier wave oscillator 10 and is input to one input end of the modulator 11.
On the other hand, the ID discriminator 20 identifies the ID held by the individual or the ID of the
specific space, and outputs data indicating the ID to the voice guidance information database 21
and the position discriminator 22. The voice guidance information database 21 outputs voice
guidance information including attribute data and voice data corresponding to the ID identified
by the ID discriminator 20 to the attribute discriminator 12. The attribute discriminator 12
outputs voice data in the voice guidance information as a voice signal to the other input terminal
of the modulator 11 and the switching terminal 13a of the switch means 13.
[0035]
The modulator 11 modulates the carrier wave of the ultrasonic frequency band output from the
carrier wave oscillator 10 with the audio signal input from the attribute discriminator 12, and
outputs the modulated signal to the switching terminal 13 b of the switch means 13. Further, the
attribute discriminator 12 discriminates the attribute of the voice guidance information based on
the attribute data in the voice guidance information, and the directivity is low in the first
operation mode for reproducing the high directivity sound according to the attribute. The switch
means 13 is controlled to switch between the second operation mode for reproducing sound and
the signal supplied to the ultrasonic transducer 15.
[0036]
Further, the position identification unit 22 identifies the position where the ID identified by the
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ID identification unit 20 is present, and outputs a position command to an actuator 23 that
controls the sound emission direction of the ultrasonic transducer 15. The actuator 23 is
configured so that the sound radiation direction of the ultrasonic transducer 15 matches the
direction of the position where the ID identified by the ID identifier 20 is based on the position
command output from the position identifier 22. Drive control. According to the guidance
apparatus according to the second embodiment of the present invention, the voice guidance
beam can be made to accurately follow the voice guidance target person as the voice guidance
target person moves, and efficient voice guidance can be performed. it can.
[0037]
By the way, since the sound reproduced in the first operation mode (directional speaker mode)
has very sharp directivity, the sound provision area is very narrow. This is so remarkable that the
voice provision target approaches the guidance device. Therefore, when the voice guidance
target person is relatively close to the guidance device, the voice guidance beam may be
separated from the guidance target person. In addition, in the case of a directional speaker using
the above-described parametric array phenomenon, since a predetermined distance is required
for self-demodulation, there is also a problem that the reproduced sound pressure level is rather
reduced near the speaker.
[0038]
Third Embodiment Therefore, the guide device according to the third embodiment of the present
invention is the same as the third embodiment in which the sound output in the first operation
mode (directional speaker mode) and the second operation mode (loudspeaker (low directivity
Output) by changing the level ratio to the sound output in the (a) mode.
[0039]
The structure of the guide apparatus based on 3rd Embodiment of this invention is shown in FIG.
The guide apparatus according to the third embodiment of the present invention differs from the
guide apparatus according to the first embodiment in the configuration of the guide apparatus
according to the first embodiment shown in FIG. A level adjuster 30 for adjusting the level ratio
between the modulation signal output from the modulator 11 and the audio signal output from
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the attribute discriminator 12A; and the modulation signal and the audio signal adjusted in level
by the level adjuster 30. The attribute discriminator 12A includes a mixer 31 that generates a
composite wave by combining and generating the composite wave and outputs the composite
wave to the ultrasonic transducer 15 via the power amplifier 14, and the attribute discriminator
12A determines the level of the modulation signal and the voice signal The level ratio command
is generated so as to change the ratio and is output to the level adjuster 30, and the other
configuration is the same as that of the guiding device according to the first embodiment. The
same reference numerals are given to hydrogen, and the duplicated description thereof is
omitted. The level adjuster 30 corresponds to the level adjusting means of the present invention.
[0040]
In the above configuration, the attribute discriminator 12A generates a level ratio command so as
to change the level ratio between the modulation signal and the audio signal based on the
attribute information, and outputs the level ratio command to the level adjuster 30. As a result,
the level adjuster 30 adjusts the level ratio between the modulation signal output from the
modulator 11 and the audio signal output from the attribute discriminator 12A, and the mixer 31
is adjusted in level by the level adjuster 30. The modulation signal and the voice signal are
synthesized to generate a synthesized wave, and the synthesized wave is output to the ultrasonic
transducer 15 through the power amplifier 14.
[0041]
According to the guiding device of the third embodiment of the present invention, the directivity
angle of the audio output can be changed by adjusting the level of the modulation signal and the
level of the audio signal. When the ratio of the modulation signal is high, the directivity is high,
and when the ratio of the audio signal is high, the directivity is low. For example, by lowering the
level of the modulation signal (directional sound) and raising the level of the audio signal (low
directivity sound) according to the voice guidance target person (for example, the number of
people etc.) and the guidance target object It will be possible to provide effective voice guidance.
When the composite level ratio of the modulation signal and the audio signal is 1: 0, it functions
as a pure directional speaker, and when it is 0: 1, it functions as a pure loudspeaker.
[0042]
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Fourth Embodiment In the guidance apparatus according to the fourth embodiment of the
present invention, the sound output in the first operation mode (directional speaker mode)
according to the position of the identified ID, and The level ratio to the sound output in the two
operation modes (loudspeaker (low directivity) mode) is changed to be output. Furthermore,
according to the attribute of the identified ID and the position where the ID is present, the
provision form and the provision direction of the voice guidance can be appropriately changed.
[0043]
The structure of the guide apparatus based on 4th Embodiment of this invention is shown in FIG.
The configuration of the guiding device according to the fourth embodiment of the present
invention differs from the guiding device according to the third embodiment in the configuration
of the guiding device according to the third embodiment shown in FIG. A position identifier 22A,
a voice guidance information database 21, and an actuator 23 are further provided, so that the
provision form and the provision direction of voice guidance can be appropriately changed
according to the attribute of the identified ID and the position where the ID exists. The other
components are the same as those of the guiding device according to the third embodiment, and
therefore the same elements are denoted by the same reference numerals and redundant
description will be omitted.
[0044]
The guiding apparatus according to the fourth embodiment of the present invention includes a
carrier wave oscillator 10, a modulator 11, an attribute discriminator 12B, a level adjuster 30, a
mixer 31, a power amplifier 14, and an ultrasonic transducer 15. It has an ID identifier 20, a
voice guidance information database 21, a position identifier 22A, and an actuator 23.
[0045]
The ID discriminator 20 includes, for example, an RF-ID discriminator, a wireless LAN, etc., and
identifies an ID held by an individual or a specific space.
The position discriminator 22A identifies or measures the position where the ID identified by the
ID discriminator exists, and outputs a position command to an actuator described later. For
example, in a scene (a ticket gate or the like) in which a plurality of RF-ID reading terminals are
installed, the position of each reading terminal is registered in advance in the position
10-04-2019
19
identification device, and the terminals from which reading is performed are identified. The
position can be configured to command the actuator. Alternatively, the position may be identified
by measuring an area where an ID (for example, a portable terminal) exists using a wireless LAN.
[0046]
The voice guidance information database 21 stores voice guidance information associated with
each ID in advance, and is configured to output voice guidance information corresponding to the
ID identified by the ID discriminator 20 to the attribute discriminator 12B. It is done. FIG. 5
shows an example of the voice guidance information database 21. Data indicating ID, attribute
data of voice guidance information, and voice data to be output are stored in association with
each other.
[0047]
The actuator 23 has a function of controlling the sound emission direction of the ultrasonic
transducer 15, and the sound emission direction of the ultrasonic transducer 15 is identified by
the ID identification device 20 based on the position command output from the position
identification device 22A. The ultrasonic transducer 15 is drive-controlled to coincide with the
direction of the position where the ID is present. That is, the actuator 23 controls the sound wave
emission direction of the ultrasonic transducer 15 so that the sound wave (particularly
directional sound) reaches the position where the ID exists, in accordance with the position
command output from the position discriminator 22A. It is configured.
[0048]
In the above configuration, the carrier wave of the ultrasonic frequency band is generated by the
carrier wave oscillator 10 and is input to one input end of the modulator 11. The attribute
discriminator 12B discriminates the attribute of the voice guidance information based on the
attribute data of the voice guidance information, and the level ratio command to change the level
ratio between the modulation signal and the voice signal according to the attribute. Are
generated and output to the level adjuster 30. As a result, the level adjuster 30 adjusts the level
ratio between the modulation signal output from the modulator 11 and the audio signal output
from the attribute discriminator 12 B, and the mixer 31 is adjusted in level by the level adjuster
30. The modulation signal and the voice signal are synthesized to generate a synthesized wave,
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and the synthesized wave is output to the ultrasonic transducer 15 through the power amplifier
14. On the other hand, the ID discriminator 20 identifies the ID held by the individual or the ID of
the specific space, and outputs data indicating the ID to the voice guidance information database
21 and the position discriminator 22A.
[0049]
The position discriminator 22A identifies the position where the ID identified by the ID
discriminator 20 is present, and outputs a position command to an actuator 23 that controls the
sound emission direction of the ultrasonic transducer 15. The actuator 23 is configured so that
the sound radiation direction of the ultrasonic transducer 15 matches the direction of the
position where the ID identified by the ID identifier 20 is based on the position command output
from the position identifier 22A. Drive control. According to the guidance apparatus according to
the fourth embodiment of the present invention, the voice guidance beam can be made to
accurately follow the voice guidance target person as the voice guidance target person moves,
and efficient voice guidance can be performed. it can. Further, by adjusting the level of the
modulation signal and the level of the audio signal, the directivity angle of the audio output can
be changed. (If the ratio of the modulation signal is high, the directivity is high, and if the ratio of
the audio signal is high, the directivity is low. )
[0050]
Fifth Embodiment In the guiding apparatus according to the fifth embodiment of the present
invention, the sound outputted in the first operation mode (directional speaker mode) and the
second according to the position of the identified ID. The level ratio to the sound output in the
operation mode (loudspeaker (low directivity) mode) is changed to be output. In addition,
according to the attribute of the identified ID and the position where the ID is present, the
provision form and the provision direction of the voice guidance can be appropriately changed.
[0051]
The structure of the guide apparatus based on 5th Embodiment of this invention is shown in FIG.
The configuration of the guide apparatus according to the fifth embodiment of the present
invention differs from the guide apparatus according to the second embodiment in the
configuration of the guide apparatus according to the fourth embodiment shown in FIG. The level
10-04-2019
21
ratio command is generated to change the level ratio between the modulation signal and the
audio signal based on the ID information output from the ID discriminator 20 and the attribute
information output from the attribute discriminator 12. The configuration is to output to the
adjuster 30, and the other configuration is the same as that of the guiding device according to
the fourth embodiment, so the same elements will be denoted by the same reference numerals,
and overlapping descriptions will be omitted. .
[0052]
In the above configuration, the position identifier 22 B changes the level ratio between the
modulation signal and the audio signal based on the ID information output from the ID identifier
20 and the attribute information output from the attribute identifier 12. The level ratio command
is generated and output to the level adjuster 30.
[0053]
As a result, the level adjuster 30 adjusts the level ratio between the modulation signal output
from the modulator 11 and the audio signal output from the attribute discriminator 12, and the
mixer 31 is adjusted in level by the level adjuster 30. The modulation signal and the voice signal
are synthesized to generate a synthesized wave, and the synthesized wave is output to the
ultrasonic transducer 15 through the power amplifier 14.
According to the guiding apparatus of the fifth embodiment of the present invention, the
directivity angle of the audio output can be changed by adjusting the level of the modulation
signal and the level of the audio signal. When the ratio of the modulation signal is high, the
directivity is high, and when the ratio of the audio signal is high, the directivity is low.
[0054]
For example, as the ID (voice guidance target person) approaches the position of the guiding
device of the present invention, the level of the modulation signal (directional sound) is lowered
to operate to raise the level of the voice signal (low directional sound). Thus, it is possible to
prevent the voice guidance beam from being separated from the person to be guided with the
movement of the person to be voice guidance, and to provide effective voice guidance. When the
composite level ratio of the modulation signal and the audio signal is 1: 0, it functions as a pure
directional speaker, and when it is 0: 1, it functions as a pure loudspeaker. Further, the directivity
10-04-2019
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angle of the voice output can be adjusted in consideration of the attribute of the voice guidance
information (content).
[0055]
The embodiment of the present invention has been described above, but the guiding device of the
present invention is not limited to the above illustrated example, and various changes may be
made without departing from the scope of the present invention. Of course.
[0056]
BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the structure of the
guidance apparatus which concerns on 1st Embodiment of this invention.
The figure which shows an example of the structure of the electrostatic-type ultrasonic
transducer suitable for using as an ultrasonic transducer in the directional speaker apparatus
which concerns on each embodiment of this invention. The characteristic view which shows an
example of the frequency characteristic of an electrostatic type ultrasonic transducer. The block
diagram which shows the structure of the guidance apparatus which concerns on 2nd
Embodiment of this invention. Explanatory drawing which shows an example of the content of
the audio | voice guidance information database in the guidance apparatus based on 2nd
Embodiment of this invention shown in FIG. The block diagram which shows the structure of the
guidance apparatus which concerns on 3rd Embodiment of this invention. The block diagram
which shows the structure of the guidance apparatus which concerns on 4th Embodiment of this
invention. The block diagram which shows the structure of the guidance apparatus which
concerns on 5th Embodiment of this invention.
Explanation of sign
[0057]
DESCRIPTION OF SYMBOLS 10 ... Carrier wave oscillator 11 ... Modulator 12, 12A, 12B ...
Attribute discrimination device 13 ... Switch means 14 ... Power amplifier 15 ... Ultrasonic
transducer 20 ... ID discrimination device 21 ... Voice guidance information database 22, 22A,
22B ... Position discrimination device 23: Actuator 30: Level adjuster 31: Mixer
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