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JP2015014852

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DESCRIPTION JP2015014852
An acoustic guiding apparatus using signal wiring in which a plurality of speakers are
periodically arranged in phase order in a guiding route, and using one or more signal sound
generating waves having different traveling speeds in one signal wiring. , Improve to guide more
efficiently than a single wave. SOLUTION: When using two waves in which the voice of a bird of a
signal sound is changed to distinguish the waves using forward and backward waves at a
constant speed, it is possible to go up and down with one signal wiring. Route guidance will be
possible. Further, in the system of the present invention, when the wave velocity u and the type
of bird's voice are determined, the wave of the wave velocity u is provided by supplying the
signal sound to the phase number p calculated using the linear equation by the system controller.
You can make The two wave velocities u1 and u2 can be defined to generate signal waves of fast
wave velocity and slow wave velocity, and can be used for guiding guidance for pedestrians with
different speeds. [Selected figure] Figure 1
Acoustic guidance system using multiple wave velocities
[0001]
The present invention relates to an improvement of a system for safely guiding by hearing when
a pedestrian such as a visual impairment walks on a road or an intersection.
[0002]
As a prior art of the present invention, the sound guidance apparatus (patent document 1)
applied earlier sets up the guidance route which continues from an arbitrary starting point to the
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end point, and as if a small bird fly along a route, it leads a pedestrian. Provide a ringing and
guidance system.
For this purpose, a plurality of loudspeakers are installed at substantially constant intervals in
this route, and a small bird sounds while jumping along the route and repeatedly generates a
signal sound to guide the pedestrian, and the entire route and direction of the walking range,
Provide a system to indicate the location of danger and pedestrians. In order to create a system
in which a small bird sounds and guides it, a wave of a signal is formed from the start to the end
of the route. The present invention enables efficient use in this system by forming waves of a
plurality of signals with different speeds.
[0003]
Japanese Patent Application No. 2011-30799 Japanese Patent Application No. 2012-212744
[0004]
In the system of Patent Document 1, a signal wiring in which a plurality of speakers are
periodically arranged in the order of phases is installed from the start point to the end point of
the route to be guided, and the sound for guidance is from the speakers installed at different
positions. By repeating the generation in the order, the generation points of the sound are moved
periodically, the generation points of the sounds generated from the respective speakers are
repeatedly moved like waves, and the traveling path is guided.
An object of the present invention is to improve guidance by using two or more waves having
different traveling speeds for one signal wiring, more efficiently than using one wave.
[0005]
As an example of using two waves for one signal wiring, if a backward wave of the same speed as
a forward wave of constant speed v is used, waves of two speeds v and −v will be used. Change
the cry to distinguish the waves. As the sound for guidance, if you use the voice of a small bird
that cries "Peepy" and "Kook" for two waves, going up follows a small bird that sounds "Peepy",
and goes down with a small bird that sounds "Kooku", A single signal wiring enables up and
down route guidance and improves efficiency over using only one wave. You can also change the
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speed of the two waves freely.
[0006]
The waves of the formed voice signal are easy to hear as waves of a speed close to the traveling
speed of the pedestrian, and the types of the birds of the birds are different, so both can be
distinguished. When the up and down guidance signals are carried on one signal wiring, the
pedestrian should follow the voice of the bird in the direction he / she wants to go. When the
bird's voice is a little early, even if you overtake the pedestrian and leave ahead, the voice of the
bird riding on the next wave head will come and guide you from immediately after, so you will
not lose track. At that time, the voice of the other type of bird comes from the front, passes by,
and moves backward, so it is less likely to disturb the guidance of the pedestrian moving forward.
[0007]
FIG. 1 is a signal distribution diagram of the sound guiding system of the present invention. FIG.
2 is a signal distribution diagram of FIG. 5 in the patent document 1 acoustic guidance system.
FIG. 3 is a block diagram of the circuit of the sound guiding system of the present invention. FIG.
4 is an installation diagram of signal wiring of the first embodiment. FIG. 5 is a signal distribution
diagram of the second embodiment. FIG. 6 is a signal distribution diagram for explaining the
signal sound heard by the later pedestrian in the second embodiment. FIG. 7 is a signal
distribution diagram for explaining the signal sound heard by the faster pedestrian in the second
embodiment.
[0008]
FIG. 1 is a signal distribution diagram of the sound guiding system of the present invention. FIG.
2 is a signal distribution diagram found in prior art U.S. Pat. FIG. 2 shows only the forward waves
shown by white circles, while FIG. 1 adds the reverse waves of gray circles. In both figures, the
horizontal axis represents the position of the speaker by the distance from the origin, and the
speaker is installed every d = 1 m. The vertical axis represents time. The white circles in FIG. 2
are signal waves of forward waves, and indicate the time k for sounding the speaker at the
distance x. c = 0.5 s is a clock pulse period, and k is a controller clock pulse number. From the
installation interval d of the speakers and the period, the traveling wave velocity v of the acoustic
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signal is v = d / c = 2 m / s. White circles connected by thin solid lines represent one wave, and at
each circle position, when the bird roars like "Peepy", its position changes with time, so it sounds
like the bird flies. A plurality of white circles connected by thin solid lines are repeatedly
arranged, and form waves of traveling waves as a whole. The thin solid slope is the reciprocal of
the velocity. Since the gray circle receding waves in FIG. 1 are repeatedly arranged in a row of
gray circles connected by thin solid lines and the slope of the thin solid line is negative, the
waves of the receding waves as a whole are Form. The broken line described as the
pedestrian's trajectory indicates a trajectory that the pedestrian walked from x = 0 m to x = 10
m at a speed of 1 m / s. When walking in this way, the pedestrians scream while birds fly in the
direction of their own, and the birds hear one after another coming and passing. If you follow it,
you can go along the path of signal wiring. Even when the length of the route is several tens of
meters or more, guidance can be provided. In Fig. 1, you will hear the signal sound of the
backward wave at the same time as the forward wave, but this sounds like a bird with a different
voice coming from the front and passing by behind it, so it interferes with the guidance effect.
There is little.
[0009]
FIG. 3 shows a block diagram of the circuit of the system of the invention. This figure is the same
as FIG. 1 of Patent Document 1. The present invention can use substantially the same circuit as
the circuit of Patent Document 1. The sound source 1 generates a voltage waveform of the sound
source. In this embodiment, since two types of voices are used, it is necessary to prepare two
types of voltage waveforms. This signal is distributed to each phase, and the amplifier 3 amplifies
it. In this example, the signal wiring 4 is repeated with the number of phases n = 4, the speakers
A, B,. When received in phase order, the speakers whose positions are shifted in the order of A,
B,... Generate signal sounds and become waves because they are repeated. The controller 6 is a
computer that controls the entire circuit. In order to form the wave of the sound shown in the
signal distribution diagram of FIG. 1, a control signal is sent from the controller to the distributor
which controls which speaker is sounded at which time. When the clock signal of the computer is
issued as k = 0, 1, 2, 3, 4, 5, 6 with the passage of time, the phase number p for producing the
forward sound is p in the case of FIG. It becomes = 4, 1, 2, 3, 4, 1, 2. The phase number p for
inserting a signal is given by the equation p = {k−1 (mod n)} + 1. mod represents the remainder
divided by the number of phases n, and p repeats 1, 2, 3, and 4 sequentially. At the same time, it
is assumed that the phase number p for producing the backwash sound is p = {2-k (mod n)} + 1.
The phase number is p = 3, 2, 1, 4, 3, 2, 1. p is repeated in the reverse order of 1, 2, 3 and 4. By
setting the computer program in this manner, a guidance signal can be generated. In Fig. 1, the
forward and reverse waves are designed not to ring the speaker at the same moment, but even if
the number p is shifted to sound at the same moment, practically no problem occurs .
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[0010]
FIG. 4 is a plan view of the acoustic guidance system installed on a pedestrian crossing. One
signal wiring 4 is installed, and black circles represent speakers. In order to guide the person
passing from the right to the left in the figure, the sound of the sound of the bird's voice uttering
"Peepy" and the sound of the bird's voice squeaking "Cook" for the person crossing the opposite
direction. The signal wiring of the book can provide guidance in both directions. As described in
Example 3 of Patent Document 1, if making a rule that the right side of the signal wiring path is a
safe passing zone in the traveling direction of the signal sound, if walking according to this rule,
the right side of the signal wiring will be immediately It is better to walk in the direction of the
signal sound. You will pass on the right at this pedestrian crossing. When the route of the
guidance is very long, if you stop on the way, if you forget the difference between the birds'
voices, there is a possibility that misunderstanding may occur between the up and down
directions, but if the central signal wiring is not crossed Misunderstandings will decrease. Besides
this, voice guidance of the destination is used together to prevent mistakes. In FIG. 4, the reason
why the distance between the speakers is small near both sides of the pedestrian crossing is to
make the wave velocity smaller and to notify that the shore is near.
[0011]
For example, when escalators and stairs are in line, or where moving walkways and immovable
corridors are in line, there are pedestrians with high speed and pedestrians with low speed. The
wave of the signal sound is required. As an example, it is assumed that the speed of a fast
pedestrian is 2 m / s and the speed of a slow pedestrian is 1 m / s. The signal sound for guiding a
fast pedestrian is "Piyopiyo", the flight speed of a small bird, that is, the wave velocity u1 = 8/3
(m / s), the signal sound for guiding a slow pedestrian is "Cuckoo", The wave velocity is u2 = 4/3
(m / s). The flight speed is the speed at which the voice generation point moves, while the signal
sound is compared to the small bird's cry. The values of u1 and u2 were appropriately selected,
and here, they were about 1.3 times the walking speed.
[0012]
In the sound guiding system of the present invention, when the number n of phases, the speaker
interval d and the clock period c are determined, and the wave velocity u and the basic waveform
(type of bird's voice) are determined, The wave is fixed. This will be described in four stages. (1)
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In the signal wiring of the phase number pn phase of the speaker, phase numbers p starting from
0 are attached to n wires to set p = 1, 2,..., N−1 (Expression 1). The position x of the phase
number p is x = pd (Expression 2). Since the placement of the loudspeakers repeats periodically,
p = n is in phase with p = 0. D = nd (Equation 3) is the wavelength in the x-direction of the wave.
(2) Clock number k The clock number k on which the system operates starts from 0, and k = 1,
2,..., K−1 (Equation 4). The number K is the number of the first cycle, and the same operation is
periodically repeated after k = K. The unknown number K can be obtained by (Equation 13)
which will appear later. The operation time t is t = kc (equation 5) using the clock cycle c. The
period T of the wave T, the period T in the direction t, is T = Kc (equation 6). The wave velocity v
in the case of Example 1 was v = d / c, and K = n. (3) Equation of straight line When a small bird
flies at a speed u on a straight line, the equation of straight line is x = ut + x0 (equation 7). x0 is
the initial position of x at t = 0. Substituting Equations 2 and 5 into Equation 7 results in pd = ukc
+ x0 (Equation 8). If this equation is divided by d, then p = ukc / d + q (Equation 9). Here, q is an
initial value of p when t = 0 and is q = x0 / d (equation 10). q is one integer selected from 1 to n1. In equation (9), since p must be an integer, when the fractional expression ukc / d is not
divisible, it is assumed that fractions are processed by rounding or the like. (Equation 9) becomes
an approximation equation, and multiplying this by d gives x + uck + x0 (Equation 11). (Equation
11) is a straight line equation representing the trajectory of a small bird (trajectory of the signal
sound generation point) in the signal distribution diagram of the vertical axis k and the
horizontal axis x. The controller of the system can calculate the phase number p according to (Eq.
9) and provide a signal sound to the distributor to create a signal wave. (4) The period T phase
number p of the wave starts from the initial value q and increases, and when it makes one
revolution, p = n + q (formula 12). This is the condition of the cycle. When (Equation 12) is put
into (Equation 9), n = ukc / d. The k that applies to this equation is the number K in the first
cycle, and K = nd / uc (Equation 13).
If this is put into (Formula 6), period T will become T = Kc = nd / u = D / u (Formula 14).
[0013]
FIG. 5 is a signal distribution diagram of the second embodiment, where the wave velocity of the
signal of Piyopiyo is u1 = 8/3 (m / s), and the straight line of the equation (Expression 11) of
the locus of the small bird is shown by a thin line. The point of (x, k) of the coordinates for
transmitting the signal obtained by the approximate expression is represented by □. At this time,
x0 = 2. Also, when k = 1 and k = 4 and the like equivalent to periodicity, a □ mark indicating that
the signal is sent to two points of p = 1 and p = 2 both rounding off and rounding up is described
instead of rounding off. If the signal outputs of these two points are halved, then the centers of
gravity of both outputs will be p = 1.5, which is more accurate. In addition, assuming that the
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wave velocity of the "Cuckoo" signal is u2 = 4/3 (m / s), the straight line of the equation of
(Equation 11) of the locus of the small bird is shown by a thin line, and the coordinates for
transmitting the signal obtained by the approximate expression The point of (x, k) of was
represented by ○ mark. At this time, x0 = 1.
[0014]
Although FIG. 5 looks at first glance complicated, there is periodicity of wavelength D = 4 (m) in
the lateral direction. In the vertical direction, according to (Equation 13), there are periodicities
of period K1 = D / u1c = 3 in □, and there are periodicities of period K1 = D / u2c = 6 in ○.
Therefore, this signal distribution diagram is constructed by repeating basic patterns in the range
of x = 0 to 3 and k = 0 to 5 vertically and horizontally. The two dashed lines passing through the
origin are the walking trails of the fast and slow pedestrians.
[0015]
FIG. 6 is a signal distribution diagram for explaining the signal sound heard by the pedestrian
who is faster in the above signal distribution diagram. Assuming that the signal sound far from
the pedestrian can not be heard, it is assumed that the signal sound within 3.5 m before and after
the broken line of the pedestrian's trajectory can be heard. Shown by a thick arrow. In the range
of the figure, there are three arrow lines of "Piyo Piyo" and two arrow lines of "Cuckoo", and the
signal sound of "Piyo Piyo" is faster than the pedestrian, so slowly pass over the pedestrian and
"Cuckoo" Since the signal sound is slow, it can be seen that it sounds like a pedestrian overtakes.
[0016]
Fig. 7 is a diagram for explaining the signal sound heard by the slower pedestrian, and if the
range within 3.5 m before and after the trajectory of the slow pedestrian is enclosed by a chain
line, five arrow lines of "Piyopiyo" are in the range of the diagram. There are two arrows of
"Cuckoo". The sound of "Piyo Piyo" is much faster than that of a pedestrian, so it can be said that
the pedestrian is quickly overtaken, and that the sound of "Cuckoo" is not so fast, so it sounds
like it is slowly passing the pedestrian. If you follow the bird's voice slowly overtaking you will be
guided successfully.
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[0017]
1 Sound source: A source of signal sound and electrical waveform. 2 distributor 3 amplifier 4
signal wiring. This is a bundle of n electric wires passing the n-phase signal and a common wire.
5 Common wire 6 Control 7 Speakers 7 A to H control package for each phase. This is a package
of 1,2,3,6.
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