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DESCRIPTION JP2011148433

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DESCRIPTION JP2011148433
The present invention provides a vehicle presence notification device that makes it easy for a
person to notice the presence of a vehicle and generates a notification sound with a small degree
of discomfort. SOLUTION: A vehicle presence informing apparatus comprises (i) a basic high
frequency of 4 kHz which is a high frequency which is easy to be attached to a human ear, and
(ii) a harmonic of 2 kHz, 1 kHz, 500 Hz. The three auxiliary low frequencies are generated
simultaneously. By including "the basic high frequency of 4 kHz which can be easily attached to
the human ear" in the notification sound, it is possible to inform the surroundings with a high
probability that the vehicle is present. In addition, by including "the 3 auxiliary low frequencies of
2 kHz, 1 kHz, and 500 Hz with 4 kHz as an overtone relationship" in "awkward 4 kHz", the
notification sound including "the basic high frequency of 4 kHz" can be softened. Can reduce the
discomfort given to people. That is, discomfort can be suppressed and the presence of a vehicle
can be notified to the surroundings with high probability. [Selected figure] Figure 1
Vehicle presence notification device
[0001]
The present invention relates to a vehicle presence notification device for notifying the outside of
a vehicle of the presence of a notification sound by a notification sound, and in particular,
traveling is performed by an electric motor that generates rotational power by energization such
as an electric car, a fuel cell vehicle, or a hybrid vehicle. The present invention relates to a
technology for notifying the outside of a vehicle of the possible existence of the vehicle.
[0002]
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1
The vehicle presence informing device which notifies the presence of the vehicle to the
surroundings by the notification sound needs to generate a notification sound that is easy for a
person to notice.
Then, it is possible to make it easy for a person to notice by generating an alarm sound of "high
frequency". However, while "sound of high frequency" is easy to notice, on the other hand, the
notification sound makes people feel uncomfortable because it is "sound to feel". As a concrete
example, "4kHz sound" is a sound that is easy to notice, but feels like it. For this reason, when the
vehicle travels while emitting the "sound of 4 kHz" as the notification sound, people outside the
vehicle may feel uncomfortable.
[0003]
Therefore, if the frequency of the notification sound is lowered to reduce the discomfort, the
notification sound becomes easy to be familiar with the environmental noise, and it becomes
difficult for people to notice the notification sound, and the effect of informing the vehicle
presence is diminished. It will On the other hand, there has been proposed a technique for
automatically adjusting the sound pressure level of the notification sound in accordance with the
surrounding noise level to reduce the discomfort caused by the notification sound being too loud
(see, for example, Patent Document 1). However, even with the technique disclosed in Patent
Document 1, it is not possible to solve the problem of giving a person a sense of discomfort due
to the high frequency notification sound.
[0004]
Japanese Patent Application Publication No. 06-162351
[0005]
The present invention has been made in view of the above problems, and an object thereof is to
provide a vehicle presence notification device capable of making it easy for a person to notice the
presence of a vehicle and suppressing an unpleasant feeling given to the person. .
[0006]
[Means of claim 1] The vehicle presence informing apparatus adopting the means of claim 1
comprises, as notification sound, (i) high frequency which is easy to be attached to human ear
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(high frequency which human generally feels uncomfortable) The basic high frequency and (ii) an
auxiliary low frequency lower than the basic high frequency and having the basic high frequency
as an overtone relationship are simultaneously generated.
[0007]
As described above, by including "the basic high frequency which is easily attached to the human
ear" in the notification sound, the notification sound can be made easy to notice, and the
presence of the vehicle can be notified to the surroundings with high probability by the
notification sound. .
On the other hand, the inventor of the present application uses the "basic high frequency" as a
notification sound by including "a low frequency auxiliary low frequency (a low frequency that
makes the basic high frequency an overtone relationship)" in the "basic high frequency". It has
been found that the notification sound including the sound can be softened, and the discomfort
given to the person can be suppressed small.
In addition, since the “basic high frequency” and the “auxiliary low frequency” have an
overtone relationship, the inventor of the present application actually includes the missing
fundamental (a missing base tone: an overtone relationship) if such a relationship exists. We have
found that the illusion that the bass does not exist actually compensates for the bass that is not
actually present by the illusion, so that the effect of making the notification sound softer can be
expected, and the discomfort given to people can be further reduced.
As described above, the vehicle presence notifying apparatus adopting the invention of claim 1
can suppress the discomfort given to a person and can notify the surroundings of the presence of
the vehicle with high probability.
[0008]
[Means for Claim 2] The basic high frequency (if a plurality of basic high frequencies are used, at
least one basic high frequency of the plurality of basic high frequencies) of the vehicle presence
informing device of the means of claim 2 is 3 kHz. Above, and it is selected from within the range
of 7 kHz or less.
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[0009]
According to the third aspect of the present invention, the auxiliary low frequency of the vehicle
presence annunciator adopting the third aspect of the present invention includes at least a half
frequency of the basic high frequency.
For this reason, even if an elderly person can not hear the basic high frequency, the alert sound
includes "half of the basic high frequency auxiliary low frequency (for example, 2 kHz if the basic
high frequency is 4 kHz)" Thus, even an old man can know the presence of the vehicle with high
probability by the notification sound.
[0010]
According to the fourth aspect of the present invention, the auxiliary low frequency of the vehicle
presence notifying apparatus adopting the means of the fourth aspect is constituted by a
plurality of frequencies which are in a harmonic-overlapping relation. As a specific example,
assuming that the basic high frequency is A, the auxiliary low frequency is A × (1/2) <n>, and n
= 1 to 3 continuous integers, or n = 1 to It consists of four consecutive integers. As described
above, the discomfort of the notification sound can be suppressed by using a plurality of
auxiliary low frequencies in a harmonic-overtone relationship to increase frequency components
that do not feel unpleasant. In addition, by using a plurality of auxiliary low frequencies in a
harmonic relationship, the above-mentioned effect of the missing fundamentals (effect of
artificially adding bass) can be enhanced, and an effect of making the notification sound softer by
artificially adding bass. Can be enhanced.
[0011]
The auxiliary low frequency of the vehicle presence annunciator adopting the means of claim 5
includes a frequency lower than at least 1 kHz. As described above, by including a frequency
lower than 1 kHz as the auxiliary low frequency, the effect of making the notification sound
softer can be enhanced, and the discomfort given to a person can be reduced.
[0012]
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4
According to the sixth aspect of the present invention, there is provided a vehicle existence
notifying apparatus adopting the means of the sixth aspect of the present invention, wherein the
alarm sound is emitted to the outside of the vehicle by the parametric speaker. By using a
parametric speaker that has strong directivity and can generate notification sound at a position
away from the vehicle, the notification sound can be generated only in the “predetermined
range where notification of the presence of the vehicle is desired”. For this reason, generation |
occurrence | production of the alarm | sound to the range which does not need to alert | report
presence of a vehicle can be prevented, and the vehicle noise to the vehicle periphery to a vehicle
periphery can be suppressed as a result.
[0013]
According to the seventh aspect of the present invention, there is provided a parametric speaker
comprising: an ultrasonic speaker; and a notification sound signal generation unit generating a
frequency signal (a frequency signal including at least a basic high frequency and an auxiliary
low frequency) to be a notification sound. And an ultrasonic amplitude modulation unit that
modulates a frequency signal to be a notification sound to a change in amplitude of a voltage (or
current) oscillating at an ultrasonic frequency, and an amplitude signal of the ultrasonic
frequency that is amplitude-modulated by the ultrasonic amplitude modulation unit. And a
speaker drive unit that drives the ultrasonic speaker.
[0014]
[Means of Claim 8] A vehicle presence informing apparatus adopting the means of claim 8 reads
"basic high frequency in environmental noise".
Then, the sound pressure level of "basic high frequency in notification sound" is increased by a
predetermined sound pressure from the sound pressure level of "basic high frequency in
environmental noise" read. Thereby, the sound pressure level of "the basic high frequency
included in the notification sound" is automatically adjusted according to the environmental
noise, and the sound pressure level of the "basic high frequency included in the notification
sound" is the environmental noise. With no loss, there is no problem that the sound pressure
level of "the basic high frequency of the notification sound" becomes unnecessarily large. As a
result, the presence of the vehicle can be notified with high probability by the notification sound,
and the generation of the vehicle noise can be suppressed.
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[0015]
[Means of claim 9] The vehicle presence informing apparatus adopting the means of claim 9
includes, as notification sound, (i) a plurality of basic high frequencies and a plurality of auxiliary
lows respectively having a plurality of basic high frequencies as harmonics. And (ii) a plurality of
fundamental high frequencies form a chordal relationship. Thereby, the discomfort of the
notification sound can be suppressed to a smaller level by the chord by "the notification sound
which can suppress the discomfort given to the person and can notify the presence of the vehicle
to the surroundings with high probability".
[0016]
It is a schematic block diagram of a vehicle presence alert device. It is the front view and upper
view of an ultrasonic speaker. It is principle explanatory drawing of a parametric speaker. It is a
graph which shows the relationship between the frequency characteristic of environmental noise,
and the sound pressure level of the fundamental high frequency in alerting | reporting sound.
[0017]
The vehicle presence informing apparatus uses, as notification sound, (i) a basic high frequency
consisting of a high frequency which is easy to be attached to the human ear (a high frequency
which a person generally feels unpleasant or offensive) and (ii) this basic high frequency. At the
same time, a low frequency and an auxiliary low frequency, which makes the basic high
frequency a harmonic relationship, are simultaneously generated.
[0018]
The notification sound generated by the vehicle presence notification device may include at least
the "basic high frequency" and the "auxiliary low frequency".
Specifically, the notification sound generated by the vehicle presence notification device may be
composed of (i) only the "basic high frequency" and the "auxiliary low frequency", or (ii) It may be
configured by adding frequency components constituting other sounds to the basic high
frequency and the above-mentioned "auxiliary low frequency".
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[0019]
Further, the notification sound generated by the vehicle presence notification device may be (i)
one having a single basic high frequency (see Example 1 described later), and (ii) a plurality of
basic high frequencies. It may be composed of When a plurality of basic high frequencies are
used, it is desirable that the plurality of basic high frequencies form a chord (see Example 2
described later).
[0020]
Furthermore, the notification sound generated by the vehicle presence notification device may be
(i) using a parametric speaker to generate a notification sound consisting of an audible sound at a
location away from the vehicle, (ii) an audible sound The notification sound which consists of an
audible sound may be generated from a vehicle using the speaker etc. which generate | occur |
produce directly.
[0021]
Next, a specific example of the vehicle presence notification device will be described with
reference to FIGS. 1 to 4.
The first embodiment shows an example in which a parametric speaker is used as a specific
example of the vehicle presence notification device to generate a notification sound consisting of
an audible sound at a location away from the vehicle.
[0022]
Configuration of Embodiment 1 As shown in FIG. 1, the vehicle existence notification device of
this embodiment 1 includes an ultrasonic speaker 1 capable of emitting ultrasonic waves, and a
main device 2 that performs operation control of the ultrasonic speaker 1. And (Description of
Ultrasonic Speaker 1) The ultrasonic speaker 1 is mounted on, for example, the front or the like
of a vehicle so as to emit the generated ultrasonic wave toward the outside of the vehicle.
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[0023]
The specific example of mounting | wearing of the ultrasonic speaker 1 is shown. In the case of a
vehicle such as a hybrid vehicle equipped with an engine (an internal combustion engine that
generates rotational output by combustion of fuel), the ultrasonic speaker 1 is provided at the
front air intake opening (in the front of the vehicle) Intake of vehicle running wind which cools
the radiator: In addition, in the case of an electric car etc. which does not have a radiator, it is
attached to the inside of the cooling running wind intake), and the ultrasonic wave generated by
the ultrasonic speaker 1 is , And is provided so as to discharge toward the outer front side of the
vehicle (for example, diagonally forward toward the sidewalk side).
[0024]
The mounting position of the ultrasonic speaker 1 is not limited to the front of the vehicle, and
for example, the ultrasonic speaker 1 is mounted on the rear of the vehicle or on the lower
surface of the vehicle, and when traveling backward (when traveling backward). The notification
sound may be emitted toward the rear periphery of the vehicle. Moreover, the irradiation
direction of the ultrasonic wave in the ultrasonic speaker 1 may be fixed in a fixed direction, or
may be switchable in the radiation direction according to the vehicle driving condition or the like.
Here, as a switching means of the irradiation direction of the ultrasonic wave, a plurality of
ultrasonic speakers 1 having different radiation directions may be mounted and switched, or the
supporting portion of the ultrasonic speaker 1 may be an electric actuator (solenoid etc.) It may
be driven by switching.
[0025]
A specific structural example of the ultrasonic speaker 1 will be described. The ultrasonic
speaker 1 is an ultrasonic generator that generates air vibration at a frequency (20 kHz or
higher) higher than the human audible band. Here, ultrasonic waves are highly directional. That
is, ultrasonic waves have a high degree of straightness of propagation in the air. For this reason,
the ultrasonic speaker 1 can irradiate ultrasonic waves only in a specific direction (a direction in
which the presence of a vehicle is to be transmitted: for example, diagonally forward toward the
sidewalk) to the vehicle.
[0026]
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8
A specific example of the ultrasonic speaker 1 of this embodiment is shown in FIG. The ultrasonic
speaker 1 of this embodiment is used as a speaker array by arranging a plurality of piezoelectric
speakers 3 (ceramic speakers, piezo speakers, etc.) suitable for ultrasonic wave reproduction. The
piezoelectric speaker 3 used in this embodiment has a well-known structure including a
piezoelectric element which expands and contracts according to an applied voltage (charge and
discharge) and a diaphragm which vibrates air by the expansion and contraction of the
piezoelectric element. belongs to.
[0027]
The ultrasonic speaker 1 can control the energy amount of the generated ultrasonic wave and
the directivity range of the ultrasonic wave emitted from the piezoelectric speaker 3 by the
number and arrangement of the piezoelectric speakers 3 used. Moreover, the directivity range of
the ultrasonic wave which the ultrasonic speaker 1 generate | occur | produces can also be
controlled by using the horn part 4 shown in FIG. In this embodiment, an example using the
piezoelectric speaker 3 as an example of a speaker generating an ultrasonic wave is shown, but
this is an example and is not limited, and another form is possible if ultrasonic waves can be
reproduced. The ultrasonic wave generation means of may be used.
[0028]
(Description of Main Device 2) Next, the main device 2 for driving the ultrasonic speaker 1 will
be described. The main body device 2 includes a notification sound signal generation unit 5 for
generating a frequency signal forming a notification sound, an ultrasonic amplitude modulation
unit 6 for modulating the frequency signal of the notification sound to an ultrasonic frequency,
and an ultrasonic speaker at the modulated ultrasonic frequency. A speaker driving unit 7 for
driving 1 is provided, and operates by receiving an operation signal (informing sound generation
signal) from an ECU (abbreviation of an engine control unit) or the like. The main unit 2 is
connected to a means (described later) for automatically adjusting the output level (volume) of
the ultrasonic speaker 1 based on the environmental noise of the vehicle, and is mounted on the
main unit 2 connected to an onboard power supply such as an onboard battery. And a power
supply unit (not shown) for supplying power necessary for the operation of each of the circuits
(electrically functional components).
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9
[0029]
In the following, each means mounted on the main device 2 will be described. The notification
sound signal generation unit 5 is a means for generating a plurality of frequency signals
(synthesized waveform signals) forming a notification sound, and, for example, (i) a plurality of
oscillators, (ii) a clock generated by a reference clock (crystal oscillator) Digital sound wave
generation technology (computer) that creates arbitrary waveform signal (plural frequency
signals that make notification sound) based on signal, (iii) Arbitrary filter noise from pink noise
(even white noise) generated by noise source One of the synthesizer techniques (which may be
an analog circuit or an analog circuit combined with a computer) for extracting a frequency
signal (a frequency signal forming a notification sound) is used.
[0030]
The notification sound according to the first embodiment includes (i) a basic high frequency
consisting of a high frequency which is easy to be attached to the human ear (a high frequency
which a person generally feels unpleasant), and (ii) a frequency lower than the basic high
frequency. And an auxiliary low frequency that makes the basic high frequency a harmonic
relation.
[0031]
The basic high frequency in this embodiment will be specifically described.
The basic high frequency is selected from the frequency of 3 kHz or more and the frequency of 7
kHz or less which is easy to be attached to the human ear, and 4 kHz is adopted in this
embodiment.
[0032]
The auxiliary low frequency in this embodiment will be specifically described. The auxiliary low
frequency includes at least half the frequency of the basic high frequency. Specifically, in this
embodiment in which the basic high frequency is 4 kHz, the auxiliary low frequency includes at
least 2 kHz which is half of 4 kHz (basic high frequency).
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[0033]
Also, the auxiliary low frequency is a frequency including at least a frequency lower than 1 kHz.
Specifically, in this embodiment in which the basic high frequency is 4 kHz, the auxiliary low
frequency includes at least 500 Hz.
[0034]
Furthermore, the auxiliary low frequency is composed of three or more continuous frequencies in
a harmonic relationship. As a specific example, assuming that the basic high frequency is A, the
auxiliary low frequency is A × (1/2) <n>, and is configured by n = 1 to 3 continuous integers It
is. That is, in the case of this embodiment in which the basic high frequency is 4 kHz, the
auxiliary low frequency is 4 kHz × (1/2) <1> = 2 kHz, 4 kHz × (1/2) <2> = 1 kHz, 4 kHz × (1 /
2) It consists of three of <3> = 500 Hz.
[0035]
As described above, the notification sound signal generation unit 5 of this embodiment is 4 kHz
(an example of a basic high frequency: a frequency that is very annoying but easy to notice) 2
kHz (an auxiliary low frequency) as a frequency signal forming the notification sound. The
maximum frequency that old people can easily hear 1 kHz (an example of auxiliary low
frequency: the frequency at which people can most easily hear) 500 Hz (an example of auxiliary
low frequency: an audible but soft frequency)
[0036]
The ultrasonic amplitude modulation unit 6 includes an ultrasonic oscillator that can oscillate at
an ultrasonic frequency (that is, a frequency exceeding 20 kHz: one example, such as 25 kHz),
and the waveform signal (synthesized signal output from the notification sound signal generation
unit 5 The “increase or decrease change of voltage” of the waveform signal is modulated to the
“change of amplitude of oscillation voltage” of the ultrasonic frequency.
[0037]
This (modulating the composite waveform signal into "amplitude change of oscillation voltage")
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will be described with reference to FIG.
For example, it is assumed that the composite waveform signal input to the ultrasonic amplitude
modulation unit 6 is a voltage change shown in FIG. 3A (note that in the figure, a waveform of a
single frequency is shown to aid understanding), Actually, it is a signal waveform of a combined
frequency consisting of four frequencies).
On the other hand, it is assumed that the ultrasonic wave oscillator mounted on the ultrasonic
wave amplitude modulation unit 6 oscillates at the ultrasonic wave frequency shown in FIG.
[0038]
Then, as shown in FIG. 3C, the ultrasonic amplitude modulation unit 6 increases the amplitude of
the voltage due to the ultrasonic vibration as (i) the signal voltage of the synthetic frequency that
makes the notification sound increases, (ii 2.) The amplitude of the voltage due to the ultrasonic
vibration is reduced as the signal voltage of the synthetic frequency that makes the notification
sound becomes smaller. In this manner, the ultrasonic amplitude modulation unit 6 modulates
the composite waveform signal input from the notification sound signal generation unit 5 into
“amplitude change of oscillation voltage” of ultrasonic frequency.
[0039]
In this embodiment, as an example of the ultrasonic amplitude modulation unit 6, the change of
the signal voltage of the synthetic frequency forming the notification sound is changed to the
"voltage magnitude width" as shown in FIG. 3 (c). An example is shown. On the other hand, unlike
the case of FIG. 3C, even if the change of the signal voltage of the synthetic frequency forming
the notification sound is changed to the “width of generation time of voltage” using the
technique of PWM modulation. good.
[0040]
The speaker drive unit 7 drives each piezoelectric speaker 3 based on "the ultrasonic signal
(output signal of the ultrasonic amplitude modulation unit 6) obtained by amplitude-modulating
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the signal of the synthetic frequency forming the notification sound". By controlling the applied
voltage (charging / discharging state) of the speaker 3, each piezoelectric speaker 3 generates
“the ultrasonic wave obtained by amplitude-modulating the signal of the synthetic frequency
forming the notification sound”. As a specific example, the speaker drive unit 7 is a power
amplifier (or a charge / discharge device for a piezo element), and the waveform signal shown in
FIG. 3C from the ultrasonic amplitude modulation unit 6 to the speaker drive unit 7 The speaker
drive unit 7 applies the waveform voltage shown in FIG. 3C to the ultrasonic speaker 1 to
generate an ultrasonic wave of an output waveform shown in FIG. 3C from each piezoelectric
speaker 3. .
[0041]
Next, means for automatically adjusting the output level (volume) of the ultrasonic speaker 1
based on environmental noise outside the vehicle will be described. The main device 2 includes
means for automatically adjusting the amplification degree (amplification gain) of the speaker
drive unit 7 based on the environmental noise. The automatic adjustment means includes an
environmental noise detection means 8 for detecting environmental noises outside the vehicle, a
reading means 9 for reading sound pressure levels of basic high frequency (4 kHz) from the
detected environmental noises, The sound pressure level changing means 10 changes the
amplification degree of the speaker drive unit 7 based on the sound pressure level of the
frequency (4 kHz).
[0042]
The environmental noise detection means 8 is a means for detecting environmental noise outside
the vehicle (that is, environmental noise in a target range to which a notification sound is given),
and is equipped with a microphone of a known structure separately from the ultrasonic speaker
1 Alternatively, one piezoelectric speaker 3 out of the plurality of piezoelectric speakers 3
constituting the ultrasonic speaker 1 may be used as a substitute for a microphone. Here, a
concrete example of the frequency characteristic of environmental noise outside the vehicle
detected by the environmental noise detection means 8 is shown by a solid line A in FIG.
[0043]
The reading means 9 reads the sound pressure level of "basic high frequency (4 kHz) in
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environmental noise" from the "environmental noise detected by the environmental noise
detection means 8" and amplifies the detection signal of the environmental noise detection
means 8 It is configured including a microphone amplifier unit. Specifically, when the frequency
characteristic of the environmental noise detected by the environmental noise detection means 8
is the solid line A in FIG. 4, the reading means 9 reads the sound pressure level (about 40 dB) of
the environmental noise at 4 kHz. The means for reading the sound pressure level of "basic high
frequency (4 kHz) in environmental noise" may be provided to perform basic high frequency
volume analysis using a computer, or the sound pressure level of a specific frequency is detected.
Alternatively, the sound pressure level of the fundamental high frequency may be estimated from
the sound pressure level of the specific frequency detected.
[0044]
The sound pressure level changing means 10 changes the amplification degree (amplification
gain) of the speaker drive unit 7 according to the sound pressure level of "basic high frequency
in environmental noise" read by the reading means 9, and Sound pressure level of "basic high
frequency in sound" (Specifically, sound pressure level of notification sound in a target range to
which notification sound is given: In a specific example, it is diagonally in front of the vehicle on
the sidewalk side and specified from the vehicle The sound pressure level of the notification
sound at a place separated by a distance is 10 dB (predetermined sound pressure level) than the
sound pressure level of "basic high frequency in environmental noise" read by the reading means
9 as shown by solid line B in FIG. An example) is raised and generated.
[0045]
The sound pressure level varying means 10 and the vehicle speed sensor are interlocked, and the
amplification degree (amplification gain) of the speaker driver 7 is increased as the vehicle speed
increases, and a loud notification sound is generated as the vehicle speed increases. It may be
provided in
Alternatively, the generation of the notification sound may be stopped when the vehicle speed is
extremely low or when the vehicle is traveling at high speed.
[0046]
[Operation of First Embodiment] The operation of the vehicle presence notification device of the
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first embodiment will be described. As described above, this vehicle presence notification device
is operated by, for example, receiving an operation signal from an ECU or the like, and a specific
example is shown as follows: (i) While the vehicle is traveling (for example, while traveling
forward (Ii) operates only when the traveling speed of the vehicle is within a predetermined
speed range, (iii) while the vehicle is traveling, the presence of a person in the traveling direction
of the vehicle indicates Does not operate, and it operates only when it is confirmed.
[0047]
When the vehicle presence notification device operates, the ultrasonic speaker 1 emits an
ultrasonic wave (a sound wave that can not be heard) obtained by amplitude-modulating the
signal waveform of the notification sound, as shown in FIG. 3 (c). Then, as shown in FIG. 3 (d), as
ultrasonic waves propagate through the air, the short ultrasonic waves are distorted and blunted
at the wavelength due to the viscosity of the air and the like. As a result, as shown in FIG. 3E, the
amplitude component contained in the ultrasonic wave is self-demodulated in the air on the way
of propagation, and as a result, it is separated from the ultrasonic wave generator (ultrasonic
speaker 1) Notification sound (4 kHz, 2 kHz, 1 kHz, 500 Hz synthetic sound) is generated at the
place.
[0048]
[Effect 1 of Embodiment 1] As described above, the vehicle presence notification device of
Embodiment 1 is used as a notification sound as follows: (i) High frequency that easily comes in
contact with a person's ear (high frequency at which people generally feel uncomfortable) The
basic high frequency of 4 kHz and (ii) three auxiliary low frequencies of 2 kHz, 1 kHz, and 500
Hz, which are lower than the basic high frequency and whose basic high frequency is an
overtone relationship, are simultaneously generated.
[0049]
As described above, by including "the basic high frequency of 4 kHz that can be easily attached
to the human ear" in the notification sound, the notification sound can be made easy to notice,
and the presence of the vehicle by the basic high frequency of 4 kHz contained in the notification
sound Can be notified to the surroundings with high probability.
Specifically, as shown in Table 1 below, a single frequency of 500 Hz (A in the table), one
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frequency (B in the table), two (C in the table), three (3 in the table). By adding to the order D) in
the table, it became easier to notice as the high frequency was applied, and by adding the 4 kHz
sound, it became easy to notice the notification sound with high probability.
[0050]
Also, by including "3 kHz auxiliary low frequencies of 2 kHz, 1 kHz and 500 Hz whose harmonics
are related to the basic high frequency" at the same time as "4 kHz basic high frequency",
notification sound including "4 kHz basic high frequency" It can be softened and can reduce the
discomfort given to people. Specifically, as shown in Table 2 below, in a single frequency of 4
kHz (E in the table), one frequency (4 in the table), 2 (G in the table), and a frequency having a
harmonic relationship of 4 kHz. By sequentially adding one to the next (H in the table), the tone
changes to a softer tone as the lower frequency is applied, and by adding the 500 Hz sound, the
user can suppress the discomfort and become an alert sound that is easy to notice I got
[0051]
Furthermore, the frequency components that make up the notification sound are in an overtone
relationship of "a basic high frequency of 4 kHz" and "three auxiliary low frequencies consisting
of 2 kHz, 1 kHz, and 500 Hz". For this reason, the missing fundamentals compensate for up to
250 Hz that is not actually present by the illusion, and the 250 Hz can be heard by the illusion,
so that the effect of softening the notification sound can be expected, and the discomfort given to
people can be made smaller. it can. As described above, the vehicle presence notification device
according to the first embodiment can suppress the discomfort given to a person and can inform
the surroundings of the presence of the vehicle with high probability.
[0052]
[Effect 2 of the First Embodiment] The vehicle presence notification device in the first
embodiment includes at least a half frequency of the basic high frequency as the auxiliary low
frequency. Specifically, the notification sound includes "2 kHz auxiliary low frequency" which is
half of "4 kHz basic high frequency". For this reason, even if it is an old man who can not hear
the "basic high frequency of 4 kHz", "2 kHz auxiliary low frequency" that the old man easily
notices is included in the notification sound, so even the old man has high probability of the
vehicle. You can know the existence.
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[0053]
[Effect 3 of Embodiment 1] The auxiliary low frequency included in the notification sound is
constituted by three or more continuous frequencies in a harmonic relationship. Specifically, in
the case of this embodiment in which the basic high frequency is 4 kHz, the auxiliary low
frequency is constituted by three continuous 2 kHz, 1 kHz, and 500 Hz in a harmonic
relationship. As described above, by using three or more auxiliary low frequencies that are
continuous in a harmonic relationship to the basic high frequency, it is possible to increase
frequency components that do not feel unpleasant and to enhance the effects of the missing
fundamental, and missing The notification sound can be softened by the pseudo-addition of the
bass by the effect of the fundamental, and the discomfort of the notification sound can be
suppressed small.
[0054]
[Effect 4 of Embodiment 1] Since the notification sound includes an auxiliary low frequency of
500 Hz lower than 1 kHz, the notification sound can be more surely softened, and the discomfort
due to the notification sound can be suppressed to a small level.
[0055]
[Effect 5 of the First Embodiment] The vehicle presence notification device of the first
embodiment emits a notification sound from the parametric speaker to the outside of the vehicle.
By using a parametric speaker, the notification sound can be generated at a position away from
the vehicle. In addition, parametric speakers are highly directional and can generate notification
sound only in a specific direction. Thereby, the notification sound can be generated only in "a
predetermined range where notification of the presence of a vehicle is desired (specifically, a
position diagonally ahead of the vehicle on the sidewalk and at a predetermined distance from
the vehicle)" . In other words, it is possible to prevent the generation of notification sound to a
range where it is not necessary to notify the presence of a vehicle, and to suppress the
generation of vehicle noise.
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[0056]
[Effect 6 of Embodiment 1] The vehicle presence notification device of this embodiment 1
automatically adjusts the output level (volume) of the ultrasonic speaker 1 based on the
environmental noise outside the vehicle, and "the basic high frequency in the notification sound
Is generated by 10 dB higher than the sound pressure level of “basic high frequency in
environmental noise” read by the reading means 9. As a result, there is no problem that the
sound pressure level of "the basic high frequency included in the notification sound" loses to the
environmental noise and the sound pressure level of "the basic high frequency included in the
notification sound" unnecessarily increases. As a result, the presence of the vehicle can be
notified with high probability by the notification sound, and the generation of the vehicle noise
can be suppressed.
[0057]
[Effect 7 of Embodiment 1] The notification sound of this embodiment 1 is configured by
combining a plurality of frequencies, and the respective frequencies are harmonically related (in
this embodiment, 4 kHz, 2 kHz, 1 kHz, 500 Hz) Can be sounded as a single sound (in this
embodiment, a sound of "do" on the average rhythm scale).
[0058]
Example 2 will be described.
In the above embodiment, an example is shown in which the notification sound is configured
only with one basic high frequency (4 kHz) and a plurality of auxiliary low frequencies (2 kHz, 1
kHz, 500 Hz) that make this basic high frequency (4 kHz) an overtone relationship. The On the
other hand, in the second embodiment, the notification sound is constituted by a plurality of
basic high frequencies and a plurality of auxiliary low frequencies each having a plurality of basic
high frequencies as harmonics.
[0059]
Specifically, in the second embodiment, a plurality of fundamental high frequencies are selected
so as to constitute a chord relationship (Domiso of the major rhythm scale, refala, missishi,
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radomi, Shirefha, etc .: long harmonic tones or short harmonic tones). It is A specific example is
shown. When a plurality of basic high frequencies constitute a chordal relationship of "Domiso",
4 kHz (do), 5 kHz (mi), 6 kHz (so) as basic high frequencies so that a plurality of basic high
frequencies can play "domiso" select.
[0060]
In the second embodiment, when 4 kHz (do) is the basic high frequency, 2 kHz, 1 kHz, and 500
Hz are selected as the plurality of auxiliary low frequencies, and when 5 kHz (mi) is the basic
high frequency, the plurality of auxiliary When 2.5 kHz, 1.25 kHz, and 625 Hz are selected as the
low frequency, and 6 kHz (so) is used as the basic high frequency, 3 kHz, 1.5 kHz, and 750 Hz
are selected as the plurality of auxiliary low frequencies.
[0061]
That is, in the second embodiment, the notification sound is "4 kHz, 2 kHz, 1 kHz, 500 Hz"
forming the sound of the do, "5 kHz, 2.5 kHz, 1.25 kHz, 625 Hz" forming the sound of the mi,
And “6 kHz, 3 kHz, 1.5 kHz, 750 Hz”, which is a combination of the following frequencies:
[0062]
In the second embodiment, a notification generated by a vehicle is generated by generating a
chord (a tone that a person feels preferable) as a notification sound notifying the user of the
presence of the vehicle with high probability and suppressing discomfort. The discomfort of the
sound can be further reduced.
[0063]
In the above embodiment, an example in which the notification sound is generated to the front of
the vehicle when the vehicle is traveling forward is shown. However, the notification sound may
be generated to the rear and around the vehicle when the vehicle is traveling backward.
In the above embodiment, an example is shown in which the notification sound is generated at a
place away from the vehicle using the technology of the parametric speaker, but the notification
sound is generated directly from the notification sound generator (for example, a speaker)
mounted on the vehicle You may
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Alternatively, the technology of the parametric speaker and the technology of directly emitting
the notification sound (audible sound) from the notification sound generator (speaker or the like)
may be combined and switched according to the situation.
[0064]
In the above embodiment, “the basic high frequency and the auxiliary low frequency are
continuous in the harmonic relation (specifically, continuous in the harmonic relation of“ 4 kHz,
2 kHz, 1 kHz, 500 Hz ”)”. , “The basic high frequency and the auxiliary low frequency
maintain the harmonic relationship and lack continuity (specifically,“ 4 kHz, 1 kHz, 500 Hz
”or“ 4 kHz, 2 kHz, 500 Hz ”, etc. It may be provided "so that the frequency related to the
harmonics may escape).
In the above embodiment, an example in which the notification sound is configured by “only the
basic high frequency and the auxiliary low frequency” has been described, but even if the
notification sound to which another frequency component having no overtone relationship is
added is provided good. That is, the notification sound of the present invention may be generated
by mixing it with another sound.
[0065]
DESCRIPTION OF SYMBOLS 1 Ultrasonic speaker 5 Notification sound signal generation part 6
Ultrasonic amplitude modulation part 7 Speaker drive part 8 Environmental noise detection
means 9 Reading means 10 Sound pressure level variable means
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