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JP2007082688

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DESCRIPTION JP2007082688
PROBLEM TO BE SOLVED: To provide a guidance device capable of appropriately guiding a user
who walks a relatively long distance and goes to a destination by sound. SOLUTION: The speaker
array 10 is an apparatus in which n (n is a plurality of) speakers are arranged in a line or plane,
and with the radiation plane of each speaker directed to the pedestrian crossing 1 below. It is
arranged above the pedestrian crossing 1. The guidance sound generation unit 20 starts the
moving path 1a at the height of the head height of the person crossing the pedestrian crossing 1,
in order to assist the movement of the visually impaired crossing the pedestrian crossing 1 under
the control of the control unit 30. The acoustic beam of the guidance sound having the focal
position and the acoustic beam of the guidance sound whose focal position moves along the
movement path 1 a are output to the speaker array 10. [Selected figure] Figure 1
Guidance device
[0001]
The present invention relates to a guidance device suitable for guiding visually impaired persons
and the like.
[0002]
There have been proposed various guidance devices for guiding a visually impaired person by
emitting guidance sound to a relatively narrow specific area in a three-dimensional space by a
directional sharp speaker.
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According to this type of guidance device, it is possible to provide guidance sound only to
persons located in a specific area, and to provide guidance such as an appropriate moving
direction. In addition, this kind of induction | guidance | derivation apparatus is disclosed by
patent document 1, 2 grade | etc. ,, for example. JP, 2002-354572, A JP, 6-63,070 A
[0003]
By the way, although the conventional guidance apparatus mentioned above can provide
guidance voice appropriately to a person who is located in a specific area, it provides guidance
sound to those who have come out of the specific area. I can not do it. Therefore, there is a
problem that it is not possible to properly guide a person who has to walk a relatively long
distance before reaching the destination.
[0004]
The present invention has been made in view of the above-described circumstances, and it is an
object of the present invention to provide a guidance device capable of appropriately guiding a
user who walks a relatively long distance and goes to a destination by sound. Do.
[0005]
According to the present invention, a speaker array in which a plurality of speakers are linearly
or planarly arranged, and a plurality of delayed audio signals obtained by delaying an audio
signal representing an induction sound are generated and supplied to each speaker of the
speaker array. Delayed audio signal generating means, an acoustic beam representing the
guidance sound is outputted from the speaker array, and the plurality of delayed audios are
moved so that the focal point to which the acoustic beam is converged moves along a
predetermined moving path. And a control means for controlling the generation of the signal.
According to the invention, the user can move following the focus of the acoustic beam whose
sound pressure is high. Thus, the user can be guided along the moving path of the focus of the
acoustic beam. In a preferred aspect, the control means controls the generation of the plurality of
delayed audio signals such that a plurality of acoustic beams whose focal points move along the
predetermined movement path are output. According to this aspect, the user can move following
the focus of any of the plurality of acoustic beams. In another preferred embodiment, the
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2
guidance device includes a sensor that detects the arrival of the human body near the start point
of the predetermined movement path, and the control unit is triggered by the detection of the
human body by the sensor as the focal point Control of the generation of the plurality of delayed
audio signals to output a moving acoustic beam is initiated. According to this aspect, the
guidance by the acoustic beam is performed only when the human body is detected. Therefore,
generation of unnecessary acoustic beams can be prevented. In another preferred embodiment,
the control means is a delayed audio signal for emitting a guided sound into a specific area, in
addition to a delayed audio signal for outputting an acoustic beam whose focal point moves
along the predetermined movement path. Are generated by the delayed audio signal generation
means. Typical examples of specific areas are restricted areas. According to this aspect, it is
possible to inform the user that the user is in the specific area which is, for example, the
restricted area, by the emission of the guidance sound into the specific area. In another preferred
embodiment, the guidance device comprises positioning means for determining the location of a
qualified person to receive guidance service by acoustic beam, and the control means is focused
on the location of the qualified person determined by the positioning means. Control of the
generation of the plurality of delayed audio signals such that an acoustic beam is output.
According to this aspect, since the acoustic beam can be emitted only to the person who needs
the guidance, it is possible to prevent the generation of the unnecessary acoustic beam.
[0006]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a view showing a configuration example of a guiding device
according to a first embodiment of the present invention. The guidance apparatus is an
apparatus for providing guidance service by an acoustic beam, and includes a speaker array 10, a
guidance sound generation unit 20, a control unit 30, and a memory 40.
[0007]
The speaker array 10 is a device in which n (n is a plurality of) speakers are arranged in a line or
plane, and as shown in FIG. 1, the radiation plane of each speaker is directed to the pedestrian
crossing 1 below. In the state, it is arranged above the pedestrian crossing 1. In this embodiment,
in order to assist the visually impaired person to cross the pedestrian crossing 1, assume a
moving path 1a of the height of the head of the person crossing the pedestrian crossing 1, and
having a focal position at the start point of this moving path 1a. The acoustic beam of the guiding
sound and the acoustic beam of the guiding sound whose focal position moves along the
movement path 1a are outputted by the speaker array 10.
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[0008]
The guidance sound generation unit 20 is a device for generating a delayed audio signal for
causing the speaker array 10 to generate an acoustic beam of such guidance sound. As shown in
FIG. 1, the guidance sound generation unit 20 outputs m sound sources 201-k (k = 1 to m) for
generating audio signals of various guidance sounds and the sound sources 201-k of the
respective preceding stages. Signal processing units 202-k (k = 1 to m) that respectively generate
n delayed audio signals associated with the speakers of the speaker array 10 from the audio
signals to be output, and the signal processing unit 202-k There are n adders 203-j (j = 1 to n) for
adding together delayed audio signals output from (k = 1 to m) corresponding to the same
speaker and outputting the result. Here, the output signals of the respective adders 203-j (j = 1 to
n) are supplied to the speakers corresponding to the respective ones in the speaker array 10.
[0009]
In the present embodiment, when one acoustic beam having a certain focal point is generated by
the speaker array 10, one sound source 201-k and a signal processing unit 202-k at the
subsequent stage are required to form the acoustic beam. Are selected as delayed audio signal
generation means for generating n delayed audio signals. Then, delay adjustment and level
adjustment of the delayed audio signal supplied from the signal processing unit 202-k to each
speaker are performed so that the sound waves radiated from the speakers of the speaker array
10 overlap in the same phase at the focal position. By such adjustment, an acoustic beam that
can obtain a high sound pressure locally at the focal position can be output from the speaker
array 10. The guidance sound generation unit 20 in the present embodiment includes m sound
sources 201-k and m signal processing units 202-k, which are such delayed audio signal
generation means. Therefore, in the present embodiment, it is possible to simultaneously form up
to m acoustic beams.
[0010]
The control unit 30 receives a signal indicating the present display color from the traffic light 50
provided on the pedestrian crossing 1, and the guidance sound generation unit 20 for providing
an appropriate guidance sound to the visually impaired person according to the reception signal.
It is a device that controls. The memory 40 stores parameters to be set to the sound source 201-
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k (k = 1 to m) in order to generate audio signals of various induction sounds. The memory 40
also stores data specifying delay times and gains for obtaining n delayed audio signals for
focusing the acoustic beam at the start point of the movement path 1a. Furthermore, in the
memory 40, n delay time functions Dj (x) (j = 1 to n) and gain functions Gj (x) (j = 1) used when
moving the focal point of the acoustic beam along the movement path 1a. ~ N) is stored. Here, the
independent variable x of the delay time function Dj (x) (j = 1 to n) and the gain function Gj (x) (j
= 1 to n) is from the start point (x = 0) on the moving path 1a. Of the delay time function Dk (x) (k
= 1 to n) and the gain function Gj (x) (j = 1 to n) are displaced by x from the start point on the
movement path 1a 2 represents the delay time and gain for obtaining n delayed audio signals
focusing the acoustic beam at a position. When forming an acoustic beam whose focal position
moves along the movement path 1a, the control unit 30 successively increases the independent
variable x from 0 while setting the delay time function D j (x) (j = 1 to n) and the gain The value
of the function G j (x) (j = 1 to n) is calculated, and the delay time and the gain obtained by the
calculation are set in the signal processing unit 202-k that generates a delayed audio signal. The
above is the configuration of the present embodiment. In the above, only the guiding device for
assisting the person crossing the pedestrian crossing 1 from the right side to the left side in FIG.
1 has been described as an example to simplify the description, but the configuration is basically
the same as that described above. , From the left side to the right side, a guiding device may be
provided to assist the person crossing the pedestrian crossing 1.
[0011]
Next, the operation of this embodiment will be described. If the display of the traffic light 50 is
red, for example, the control unit 30 sends a command to the sound source 201-1 and “red.
Please wait for a little while. An audio signal representing a voice of "" is repeatedly generated. In
addition, the control unit 30 reads from the memory 40 data designating the delay time of the n
delayed audio signals for positioning the focal point of the acoustic beam at the start point of the
movement path 1a. Make a delay setting of 1. As a result, as shown in FIG. 2 (a), it is "red" toward
the start point of the movement path 1a. Please wait for a little while. An acoustic beam of voice
is output. Therefore, at this time, if the blind person arrives in front of the pedestrian crossing 1,
he or she hears this voice and stops.
[0012]
After that, when the display of the traffic light 50 changes from red to blue, the control unit 30
sends a command to the sound source 201-1, and it is “blue” instead of the audio signal
generated so far. Please follow this sound. An audio signal representing a voice of "" is repeatedly
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generated. As a result, as shown in Fig. 2 (b), it is "blue" toward the start point of the movement
route 1a. Please follow this sound. An acoustic beam of voice is output. Therefore, at this time,
assuming that the visually impaired person stops in front of the pedestrian crossing 1, he or she
hears this voice and starts crossing the pedestrian crossing 1.
[0013]
In addition, the control unit 30 sends a command to another sound source, for example, the
sound source 201-2, and is "blue. Please follow this sound. An audio signal representing a voice
of "" is repeatedly generated. Furthermore, the control unit 30 sequentially increases the
independent variable x from 0 so as to move the focal point of the acoustic beam at such a speed
that the visually impaired person can sufficiently follow and walk, while the delay time function
Dj ( x) (j = 1 to n) and the values of the gain function Gj (x) (j = 1 to n) are sequentially calculated,
and the delay time and the gain obtained by the calculation are set in the signal processing unit
202-2. . As a result, as shown in Fig. 2 (b), it is "blue. Please follow this sound. And an acoustic
beam whose focal point moves along the movement path 1 a is output from the speaker array
10. Then, the focal point of this acoustic beam crosses the pedestrian crossing along the moving
path 1a. Here, a visually impaired person feels high sound pressure when in the vicinity of the
focal point of the acoustic beam, and feels that the sound pressure becomes low when it is out of
the focal position. Therefore, the visually impaired person can move himself in the direction of
feeling high sound pressure, and can cross the pedestrian crossing 1 following the acoustic
beam.
[0014]
On the other hand, when the focal position of the acoustic beam guiding the visually impaired
person has advanced by a predetermined distance from the start point of the movement path 1a,
the control unit 30 generates another acoustic beam for new visitors to the pedestrian crossing 1
Do the process of That is, the control unit 30 further selects, for example, the sound source 2013 and the signal processing unit 202-3 and is “blue. Please follow this sound. And a delayed
audio signal for obtaining an acoustic beam whose focal position moves along the movement
path 1a. As a result, as shown in Fig. 2 (c), it is "blue" similar to the one generated earlier. Please
follow this sound. An acoustic beam of voice is generated and moved along the movement path
1a so as to follow the previously generated acoustic beam. Hereinafter, similarly, whenever the
focal position of the preceding acoustic beam advances a predetermined distance from the start
point, a new sound source and signal processor are selected, and an acoustic beam is generated
to chase the preceding acoustic beam, and each of these acoustic waves is generated. The beam
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traverses the pedestrian crossing 1 sequentially. Thus, after the light turns blue, a blind person
arriving in front of the pedestrian crossing 1 can cross the pedestrian crossing 1 using the
moving acoustic beam generated immediately thereafter. In addition, although the place which
provides guidance service was made into the substantially horizontal pedestrian crossing in this
embodiment, the application scope of this invention is not limited to this. For example, it can be
applied to an inclined road, stairs going up and down to upper and lower floors, elevators,
entrances of buildings, etc., wherever there is a person to be guided. Further, although the
arrangement direction of the speaker units of the speaker array 10 is substantially horizontal in
this embodiment, the present invention is not limited to this, and the speaker units may be
inclined or up and down to facilitate focusing on the moving path targeted by the acoustic beam.
An appropriate orientation direction or shape may be selected, such as arranging in a direction or
arranging in a curved surface. Furthermore, a new voice moving in a direction different from the
moving direction of the original voice, for example, from left to right in FIG. 1 may be provided
superimposed on the original voice as a guiding sound for a new crossing person. That is, a
plurality of voices may be generated as guidance sounds, and the guidance directions of the
individual guidance sounds may be made different.
[0015]
Second Embodiment Next, a second embodiment of the present invention will be described with
reference to FIG. In the present embodiment, a human body sensor 1b for detecting the entrance
of a person to the pedestrian crossing 1 is provided in the vicinity of the start point of the
movement path 1a in the first embodiment. The human body sensor 1b may be, for example, a
weight sensor that outputs a human body detection signal when a person steps on the human
body, or may be an optical sensor including a pair of light emitting unit and light receiving unit.
As shown in FIG. 3A, when a human is detected by the human body sensor 1b, the control unit
30 (see FIG. 1) in the present embodiment receives an acoustic beam of sound corresponding to
the display of the traffic light 50 at that time. The speaker array 10 is made to output. Also, when
a human being is detected by the human body sensor 1b when the signal is blue, the control unit
30 is “blue” that moves along the movement path 1a using the detection of this person as a
trigger. Please move according to this sound. The sound beam of the voice "is output from the
speaker array 10 (not shown in FIG. 3). Furthermore, when the signal is blue and entrance of a
new person to the pedestrian crossing 1 is detected by the human body sensor 1b when a
moving acoustic beam is being generated, the control unit 30 is for that person. The moving
acoustic beam is output to the speaker array 10 (see FIGS. 3C and 3D). The contents of the
control for generating the moving acoustic beam are as described in the first embodiment.
[0016]
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According to the present embodiment, since the detection of the human body is triggered to
output the acoustic beam, it is possible to prevent the unnecessary output of the acoustic beam
and save the power consumed for the output of the acoustic beam. It has the effect of In addition,
unnecessary noise to the surroundings can be reduced, which can also contribute to
environmental protection.
[0017]
In a preferred embodiment, a wireless communication apparatus is made to carry an RFID tag
storing an ID indicating that it is a qualified person who can receive guidance service by an
acoustic beam to a blind person and perform noncontact communication with the RFID tag as a
human body sensor 1b. Install In this aspect, when the visually impaired person carrying the
RFID tag enters the pedestrian crossing 1 and the ID is read from the RFID tag by the wireless
communication device, the guidance acoustic beam is output triggered by the ID. . Therefore, it is
possible to output an acoustic beam only to a person who needs guidance and to prevent an
unnecessary output of the acoustic beam.
[0018]
Third Embodiment Next, a third embodiment of the present invention will be described with
reference to FIG. In the present embodiment, the guidance device according to the present
invention is applied to a station platform. At the station's home, a band-shaped guide sign
consisting of a large number of protrusions is provided. A visually impaired person can confirm
this guidance sign by a cane or the like, but it is often difficult to know whether he is outside (on
the track side) or inside of this guidance sign. In this respect, in view of this point, the present
embodiment guides the visually impaired person to get on the train more safely. The
configuration of the guiding device according to the present embodiment is basically the same as
that of the first embodiment.
[0019]
In the present embodiment, when the train does not enter the home, the control unit 30 (see FIG.
1) is “dangerous in the area outside the track (from the speaker array 10) (on the track side).
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Please move inside the home. A parallel beam of voice is emitted so as to move inward from the
outside (the line side) of the guide sign 6. The visually impaired person outside the guidance sign
6 can know that he is outside the guidance sign by listening to the voice, and can step over the
guidance sign 6 and move inside the home. When the train 7 enters the home and the door of the
train 7 opens, the control unit 30 uses this as a trigger to move from the vicinity of the center of
the home to the door of the train 7 "Please ride according to this sound. The speaker array 10
repeatedly generates an acoustic beam of sound. Therefore, the visually impaired person can
safely get on the train 7 according to this acoustic beam.
[0020]
Fourth Embodiment FIG. 5 is a block diagram showing a configuration of a guiding device
according to a fourth embodiment of the present invention. Similar to the first to third
embodiments, the guidance apparatus according to the present embodiment is also an apparatus
for providing a guidance service by an acoustic beam to a user. In this embodiment, the user who
receives the guidance service by the acoustic beam carries a wireless communication device that
transmits an ID that certifies the qualification for receiving the service. Further, in the service
area where the guidance service is provided, a plurality of wireless communication devices 300
performing wireless communication with the wireless communication device of the user are
disposed. The positioning device 200 reads the ID from the wireless communication device
carried by the user in the service area by these wireless communication devices 300, and
determines whether the user is a user who is qualified to receive the guidance service. At that
time, based on the reception strength of the ID in each wireless communication device 300, the
positioning device 200 determines the position of the transmission source of the ID, that is, the
location of the user who receives the guidance service by the acoustic beam. Notice. The
guidance control device 100 performs control for providing the acoustic beam of the guidance
sound from the speaker array 10 to the user located at the position notified from the positioning
device 200.
[0021]
In the first embodiment, the focus of the acoustic beam of the guidance sound output from the
speaker array 10 is moved along the predetermined movement path 1a. For this reason, the user
who wanted guidance service by an acoustic beam had to reach near the starting point of the
movement path 1a. On the other hand, in the present embodiment, the guidance service by the
acoustic beam is provided to the user located anywhere in the service area. In order to enable
such a service, the guidance control device 100 is provided with a so-called navigation function.
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When notified of the current position of the user from the positioning device 200, the guidance
control device 100 determines a path from the current position to a target position in the service
area, and moves the acoustic beam of the guidance sound along the path. . According to the
present embodiment, for example, when providing a pedestrian pedestrian of the pedestrian
crossing mentioned in the first embodiment with a guidance service by an acoustic beam, a user
located in a wide service area including a place away from the pedestrian crossing The
navigation function guides the user to the front of the pedestrian crossing and makes it possible
to cross the pedestrian crossing.
[0022]
<Other Embodiments> Although the embodiments of the present invention have been described
above, various embodiments can be considered for the present invention besides these. For
example:
[0023]
(1) In each of the above embodiments, the case of providing a guidance service using an acoustic
beam to visually impaired persons has been described as an example, but the scope of
application of the present invention is not limited to this. For example, let's say that there is a
certain department in a department store. If you want to sell the featured products in), arrange
the speaker array at various places in the department store, and by these, "○ ○ section is here.
There may also be an embodiment of generating an acoustic beam of a guidance sound such as
“,” moving the focal point of each acoustic beam according to the route to the sales floor, and
guiding the customer to the sales floor. Further, the guidance sound may not be a voice that
urges an action directly, but may be a voice that urges an action indirectly. For example, "Soon
the traffic light turns red," "The men's toilet is on the left side, the women's toilet is on the right
side," "This is for exit only."
[0024]
(2) The moving speed of the acoustic beam may be changed according to the user. Specifically,
the user is made to carry an RFID storing an ID for illuminating the qualification for receiving the
guidance service and information on the moving speed of the desired acoustic beam. Then, for
example, when the user enters a service area providing guidance service by an acoustic beam,
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10
such as the pedestrian crossing in the first embodiment, information on the moving speed is read
from the RFID carried by the user, and the information is Determine the moving speed of the
acoustic beam provided to the user. According to this aspect, it is possible to move the focus of
the acoustic beam at an appropriate speed desired by the user and safely guide the user. In the
first to fourth embodiments, the moving speed of the focal point of the acoustic beam may be
changed according to the color of the traffic light and the blinking speed. For example, if the
color of the traffic light changes from blue to yellow, the moving speed of the focus of the
acoustic beam may be increased to prompt the pedestrian to increase the walking speed.
[0025]
It is a block diagram showing composition of a guidance device which is a 1st embodiment of
this invention. It is a figure which shows the operation | movement of the embodiment. It is a
figure which shows operation | movement of the guidance apparatus which is 2nd Embodiment
of this invention. It is a figure which shows operation | movement of the guidance apparatus
which is 3rd Embodiment of this invention. It is a block diagram which shows the structure of the
induction | guidance | derivation apparatus which is 4th Embodiment of this invention.
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 10 ... Speaker array, 1a ... Movement path, 20 ... Guidance sound
production | generation part, 201-k (k = 1-m) ... Sound source, 202-k (k = 1-m) Signal processing
part, 203-j (j = 1 to n) Adder, 30: control unit, 40: memory, 50: traffic light, 200: positioning
device, 300: wireless communication device, 100: induction control device.
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