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DESCRIPTION JP2016145886

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DESCRIPTION JP2016145886
Abstract: A sound effect generator for a vehicle, which can optimize the driving operation of a
driver according to the traveling state, and can improve the driving skill. SOLUTION: In a vehicle
sound effect generator 1, a driving condition judging unit 11, a perceptual optical flow detecting
unit 12 for detecting a perceptible optical flow G1 visually recognizable by a driver, and a driving
condition are actually used. An estimated optical flow detection unit 13 for detecting an
estimated optical flow G2 estimated to be generated, a comparison unit 15 for comparing the
perceived optical flow G1 and the estimated optical flow G2, a pair of left and right speakers 8a
and 8b , The sound pressure generation unit 16 capable of adjusting the sound pressure level of
the speakers 8a and 8b, and the sound sound generation unit 16 compares the sound pressure
level of the speakers 8a and 8b with the perceived optical flow G1 and the estimated optical flow
G2. Control is performed to eliminate ΔG. [Selected figure] Figure 2
Vehicle sound effect generator
[0001]
The present invention relates to a vehicular sound effect generator, and more particularly to a
vehicular sound effect generator that controls sound pressure characteristics of a plurality of
speaker means in accordance with the difference between perceptual optical flow and estimated
optical flow.
[0002]
Heretofore, it has been known that visual information through the windshield accounts for about
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1
90% of the information recognized by the driver.
Then, the driver causes and perceives a sense of self-motion by perceiving visual information
(optical flow) accompanied by the movement of the visual object. The optical flow is an
evaluation index that is an effective evaluation index for the driver to recognize the sense of
speed and the sense of turning, so that the driver's driving operation can be optimized by
improving the optical flow cognition, and the driving skill It can improve.
[0003]
The applicant has already filed a patent application aiming to improve the recognition of optical
flow. The visual field adjustment device of the vehicle of Patent Document 1 is a visual direction
having a traveling direction determination unit that determines the traveling direction of the
vehicle, and a top that is a part of the upper end of the windshield and is set below the base. And
a visual stimulation display mechanism capable of displaying the shielding portion in the
stimulation display area, and when the turning state of the vehicle is determined, the optical flow
recognized by the driver and the area boundary line including the top of the visual stimulation
display area The shielding portion is formed so that the acute angle side crossing angle is larger
than the acute angle side crossing angle between the optical flow and the upper end portion of
the windshield glass. As a result, the multiple order component (noise) of the optical flow
generated at the upper end portion of the windshield is suppressed, and the driver's perception
of the optical flow is improved.
[0004]
By the way, there is known a sound effect generator (also referred to as Active Engine Sound)
that generates sound effects corresponding to the amount of driving operation of a driver in a
vehicle compartment through speakers in the vehicle compartment. The sound effect generator
of Patent Document 2 comprises a fundamental frequency setting means for setting a
fundamental frequency corresponding to the engine speed, a harmonic determination means for
measuring a plurality of harmonics of the fundamental frequency, and a harmonic emphasis gain
of the engine. The engine load determination circuit includes an accelerator pedal position
determination circuit, an intake air amount determination circuit, a negative pressure
determination circuit, and an engine torque determination circuit. An arrangement is disclosed
that includes at least one and adjusts the harmonic emphasis level based on the harmonic
emphasis gain. As a result, the driver can appropriately experience a sense of realism in traveling.
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2
[0005]
Japanese Patent Application No. 2014-1802016 No. 2014-507679 No.
[0006]
The driver recognizes the sense of self-motion by perceiving the optical flow.
However, since the optical flow is visual information visually recognized by the driver via the
windshield, the optical flow is significantly reduced in a traveling environment where the driver's
visibility is deteriorated such as rainy weather or night traveling. Therefore, at night driving or
the like, the driver feels the speed feeling due to the optical flow is reduced, and it is illusion that
he is traveling at a low vehicle speed despite the high vehicle speed. In particular, during turning
when the visibility is deteriorated, in addition to the decrease in the sense of speed, it is
considered that the turning sense of the driver is also reduced, so the driver may not be able to
reliably perform the appropriate driving operation.
[0007]
Generally, a person's sense of self-motion is perceived as one event experience in the brain by
integrating five sense information of human being simultaneously inputted in parallel, so-called
visual information, auditory information, tactile information and the like. Therefore, as a result of
examining the self-motion sense at the time of vehicle traveling, the present inventor has found
that optical flow (visual information) reduced due to an external factor can be effectively
complemented by auditory information.
[0008]
The visibility adjustment device for a vehicle of Patent Document 1 can stabilize the driver's line
of sight. However, Patent Document 1 does not take into consideration the situation in which the
driver's visibility is deteriorated due to external factors, and the optical flow that the driver can
perceive in the driving environment where the driver's visibility itself is deteriorated Because of
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the decrease, the driver's sense of self-motion may also be reduced. The sound effect generation
device of Patent Document 2 is control based on the correlation between the driver's operation
amount and the sound effect, so even in a running environment where the driver's sense of self
movement is reduced. However, it is difficult only to generate sound effects according to the
driver's driving operation, and to guide the driver's driving operation in a proper direction.
[0009]
An object of the present invention is to provide a vehicle sound effect generator and the like
which can optimize the driving operation of the driver according to the traveling state.
[0010]
According to the first aspect of the present invention, there is provided a vehicle sound effect
generating device comprising sound effect signal generating means for generating a sound effect
signal corresponding to an engine rotational speed, wherein the driving state determining means
determines a vehicle running state; A perceptual optical flow detecting means for detecting a
perceptible optical flow which can be visually recognized by the user, an estimated optical flow
detecting means for detecting an estimated optical flow which is estimated to be actually
generated based on a traveling state of a vehicle; Control means for comparing the perceptual
optical flow and the estimated optical flow, speaker means capable of generating an effect sound
in a vehicle interior by converting the sound effect signal, and control means capable of adjusting
the sound pressure characteristic of the speaker means And the control means is configured to
estimate the sound pressure characteristics of the speaker means by the perceptual optical flow
and the estimated optical It is characterized in that control in a direction to eliminate the
difference between the low.
[0011]
In this sound effect generator for a vehicle, the control means controls the sound pressure
characteristic of the speaker means in the direction to eliminate the difference between the
perceptual optical flow and the estimated optical flow, so that the visual condition such as the
weather or the illuminance is deteriorated. The driver's self-motion sensation caused by the
optical flow reduced due to the factor can be complemented by the sound effect (hearing
information), and the driver's driving operation can be optimized according to the traveling state.
[0012]
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The invention according to claim 2 is the invention according to claim 1, wherein the speaker
means comprises a plurality of speaker means disposed on the left and right sides of the driver,
and the control means is the left-handed speaker means when in the turning state. And sound
pressure characteristics of the right side speaker means are controlled in a direction to eliminate
the difference.
According to this configuration, the driver can obtain a turning feeling that matches the actual
corner radius and vehicle speed, and can practice a stable driving operation.
[0013]
In the invention of claim 3, according to the invention of claim 1 or 2, the control means makes
the sound pressure level of the speaker means on the turning direction side larger than the
sound pressure level of the speaker means on the opposite side to the turning direction. It is
characterized by
According to this configuration, it is possible to reliably obtain the driver's sense of turning that
matches the actual corner radius and vehicle speed.
[0014]
The invention according to claim 4 relates to the invention according to any one of claims 1 to 3,
wherein the control means is configured to calculate a difference between the perceptual optical
flow and the estimated optical flow, a turning feeling recognized by a driver, and the left side. It
is characterized in that a map in which the correlation between the sound pressure level of the
speaker means and the difference between the sound pressure levels of the right speaker means
is set is provided.
According to this configuration, the control process can be simplified.
[0015]
According to the vehicle sound effect generation apparatus of the present invention, the driver's
driving operation can be optimized according to the traveling state, and the driving skill can be
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improved.
[0016]
FIG. 1 is a schematic configuration diagram of a vehicle equipped with a vehicle sound effect
generator according to a first embodiment.
It is a block diagram of a sound effect generator for vehicles. It is explanatory drawing of the
detection area of a windshield glass. It is a vibration sound map. It is a straight-forward ordered
component map. It is a turning order component map. It is a turning half-order component map.
It is an estimated optical flow map for evaluation in straight running. It is an estimated optical
flow map for evaluation in turning. It is a speed sense correction map. It is a turning sense
correction map.
[0017]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings. The following description exemplifies what applied this invention to the vehicle V, and
does not restrict this invention, its application thing, or its use.
[0018]
Hereinafter, Example 1 of the present invention will be described based on FIGS. 1 to 11. The
sound effect generator 1 complements the driver's sense of self-motion with auditory information
by generating sound effects of the engine according to the traveling state of the vehicle V. As
shown in FIGS. 1 and 2, the sound effect generator 1 includes an ECU (Electric Control Unit) 2.
The ECU 2 is an electronic control unit including a central processing unit (CPU), a ROM, a RAM,
an in-side interface, an out-side interface, and the like. The ROM stores various programs and
data, and the RAM is provided with a processing area used when the CPU performs a series of
processing. Application programs stored in the ROM are loaded into the RAM and executed by
the CPU to perform various arithmetic processing.
[0019]
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As shown in FIGS. 1 and 2, the ECU 2 includes a CCD camera 3, a rotation speed sensor 4, an
accelerator opening sensor 5, a steering angle sensor 6, a vehicle speed sensor 7, and a pair of
left and right speakers 8a and 8b. And the navigation system 9 and the like. The CCD camera 3 is
disposed at the upper end portion of the instrument panel, and captures a forward moving
direction of the vehicle V which can be visually recognized by the driver through the windshield
W as a moving image. As shown in FIG. 3, in the detection areas of the left and right lower end
portions of the windshield W, the left perceptual optical flow f1 and the right perceptual optical
flow f2 corresponding to the visual level of the driver are respectively extracted. The CCD camera
3 may be an image sensor such as a CMOS camera, and is not limited to the CCD camera.
[0020]
The rotation speed sensor 4 is a sensor that detects the engine rotation speed of the vehicle V,
the accelerator opening sensor 5 is a sensor that detects an accelerator opening operated by the
driver, and the steering angle sensor 6 is a driver The vehicle speed sensor 7 is a sensor that
detects the traveling speed of the vehicle V. These sensors 4 to 7 output the respective detection
results to the ECU 2 in a minute cycle. The pair of speakers 8a and 8b are disposed on the side
wall portions of the passenger compartment on both left and right sides of the driver, and are
configured to be able to generate sound effects by converting sound effect signals input from the
ECU 2.
[0021]
The navigation system 9 is a system that performs route guidance of the vehicle V. As shown in
FIG. 2, the navigation system 9 is electrically connected to a GPS receiver 10 for detecting the
current position of the vehicle V. The GPS receiving unit 10 detects the current position of the
vehicle V by receiving signals from a plurality of GPS satellites. The navigation system 9 also
includes a map database 9a storing road map data including corner turning radius R and the like,
and a traffic rule database (not shown) storing traffic regulation data. The navigation system 9
uses the current position data of the vehicle V by the GPS reception unit 10, the road map data of
the map database 9a and the traffic rule data of the traffic rule database to provide the driver
with route guidance to the destination. Thus, the navigation system 9 outputs the current
position data of the vehicle V, the road map data, and the traffic regulation data to the ECU 2.
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[0022]
The ECU 2 includes a traveling state determination unit 11 (a traveling state determination unit),
a perceptual optical flow detection unit 12 (perceptual optical flow detection unit), an estimated
optical flow detection unit 13 (estimated optical flow detection unit), and a storage unit 14. , A
comparing unit 15 (comparing means), a sound effect generating unit 16 and the like. The sound
effect generator 16 corresponds to sound effect signal generating means and control means of
the present invention.
[0023]
First, the traveling state determination unit 11 will be described. The traveling state
determination unit 11 determines the current traveling and traveling states of the vehicle V
based on detection signals such as the engine rotational speed, the accelerator opening degree,
the vehicle speed, and the steering angle. For the turning driving state, the start of the turning
driving state is determined by the detection of a steering angle corresponding to a steering
torque, for example, 2.0 Nm, when the driver consciously cuts the steering, and the steering
neutral state (neutral) is detected. The end of the turning condition is determined. The traveling
state other than the turning traveling state is determined as a straight traveling state including
acceleration, constant speed, and deceleration.
[0024]
Next, the perceptual optical flow detection unit 12 will be described. The perceptual optical flow
detection unit 12 detects the perceptual optical flow (movement of an object captured by the
CCD camera 3 through the windshield glass W) to the left perceptual optical flow f1 and the right
side. The perceived optical flow f2 is detected as a parameter. The left and right perceptual
optical flows f1 and f2 create one basic constraint equation for a specific object (specific pixel) in
the moving image in front of the vehicle V captured by the CCD camera 3. Similarly, the vicinity
of the vicinity of the specific pixel By creating another constraint equation for the pixel, the value
of the unknown variable is calculated. The gradient method is a known technique, and thus the
detailed description is omitted.
[0025]
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The perceptual optical flow detection unit 12 detects a perceptual optical flow F1 that is the total
of the perceptual optical flows f1 and f2 and a perceptual optical flow G1 that is the difference
between the perceptual optical flows f1 and f2 using the following equations. There is. F1 = f1 +
f2 (1) G1 = f1−f2 (2) In the turning state, the detection areas of the perceptual optical flows f1
and f2 are set such that G1 has a positive value.
[0026]
Next, the estimated optical flow detection unit 13 will be described. The estimated optical flow
detection unit 13 detects estimated optical flows F2 and G2 estimated to actually occur during
traveling in the traveling state of the vehicle V based on maps M5 and M6 described later. The
estimated optical flow F2 is an optical estimated to be visually recognized by the driver via the
left and right lower end portions of the windshield W in good weather and in a clear traveling
environment where sufficient illuminance is secured. It is the total amount of flow. The estimated
optical flow G2 indicates the amount of optical flow in the lower left end portion of the
windshield W and the windshield, which are estimated to be visually recognized by the driver in a
good weather and in a traveling environment where sufficient illuminance is ensured. The optical
flow amount corresponds to the difference between the optical flow amount at the lower right
end portion of W and the optical flow amount. Therefore, the estimated optical flow G2 is
theoretically zero when traveling straight on a clear day.
[0027]
Next, the storage unit 14 will be described. The storage unit 14 includes an oscillating sound
map M1 preset to conform to the sound generated by the engine mounted on the vehicle V, a
straight traveling order component map M2, a turning order component map M3, and a turning
half order A component map M4, an estimated optical flow map M5 for evaluation in straight
running, an estimated optical flow map M6 for evaluation in turning, a speed sense correction
map M7, and a turning feeling correction map M8 are stored.
[0028]
As shown in FIG. 4, the vibration sound map M1 is provided with a sound source signal of a
fundamental wave sound of a fundamental frequency component corresponding to a
predetermined engine rotational speed, and integer order frequency components of 4, 6, 8 times
this fundamental wave sound. Sound source signal of the fourth, sixth, and eighth order
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component wave (harmonic) sound, and a sound source of the 3.5, 5.5 order component wave
sound having a half-order frequency component 3.5, 5.5 times the fundamental sound A signal is
provided for each engine speed.
[0029]
The sound pressure level (gain (%)) of the fourth, sixth, and eighth component wave sounds
corresponding to the accelerator opening degree in the straight running condition is set in the
straight tuning component map M2.
As shown in FIG. 5, the gains a1 and a2 of the fourth, sixth, and eighth order component wave
sounds are suppressed to a constant low gain g1 up to the accelerator opening p1, and
thereafter, the gains a2 of the sixth and eighth order component wave sounds rise. Slightly later,
the gain a1 of the fourth-order component wave sound rises with substantially the same increase
tendency as the increase tendency of the gain a2 of the sixth- and eighth-order component
sound. The gains a1 and a2 merge at points of the accelerator opening p5 and the gain g3 and
increase like a proportional function, and are maintained at a constant gain g5 above the
accelerator opening p6. Hereinafter, in the maps M2 to M4, in the gain, it is described that the
relational expressions p1 <p2 <p3 <p4 <p5 <p6 are satisfied at the accelerator opening degree.
[0030]
In the turn-order component map M3, gains b1 and b2 of fourth, sixth, and eighth order
component sound corresponding to the accelerator opening degree in the turning condition are
set. As shown in FIG. 6, the gain b1 of the fourth-order component wave sound increases in a
proportional function, reaches the gain g4 at the accelerator opening p2, and gradually decreases
above the accelerator opening p2. The gain b2 of the sixth and sixth order component sound
reaches the gain g2 at the accelerator opening p3 and changes substantially flat in the section
from the accelerator opening p3 to the accelerator opening p4, and increases at the accelerator
opening p4 or more. The gains b1 and b2 merge at points of the accelerator opening p5 and the
gain g3 and increase like a proportional function, and are maintained at a constant gain g5 above
the accelerator opening p6.
[0031]
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In the turning half-order component map M4, gains c1 of the 3.5 and 5.5 order component wave
sounds with respect to the accelerator opening degree in the turning state are set. As shown in
FIG. 7, the gains of the 3.5th and 5.5th order component wave sounds increase in a proportional
function like up to the accelerator opening p6, and the gain c1 tends to increase up to the
accelerator opening p6 There is also a large upward trend. The accelerator opening degree p6 is
set for each cornering radius, and is set to the upper limit opening degree recommended from
the viewpoint of the traveling safety of the vehicle V.
[0032]
As shown in FIG. 8, in the estimated optical flow map for evaluation M5, the correlation between
the actual vehicle speed of the vehicle V and the estimated optical flow F2 is set in advance. Since
the optical flow is visual information accompanied by the movement of the visual object, the
estimated optical flow F2 for evaluation has a characteristic that increases as the speed is higher.
[0033]
As shown in FIG. 9, the correlation between the actual vehicle speed of the vehicle V and the
estimated optical flow G2 is set in advance in the estimated optical flow map for evaluation M6.
The smaller the cornering radius R, the longer the driver can recognize the movement of the
visual object, so the estimated optical flow for evaluation G2 has a characteristic that increases as
the speed increases and as the cornering radius R decreases. Is equipped. The characteristics of
the maps M5 and M6 are set in advance based on the performance and specifications of the
vehicle V through experiments and the like.
[0034]
As shown in FIG. 10, in the speed sensation correction map M7, the correlation between the
difference ΔF between the perceived optical flow F1 and the estimated optical flow F2 and the
sound pressure correction amount ΔS1 of the sound effect is set in advance. As shown in FIG.
11, in the turning sensation correction map M8, the correlation between the estimated optical
flow G2, the turning sensation that the driver will perceive, and the sound pressure difference
amount S2 in the pair of left and right speakers 8a and 8b. Is set in advance. The map M8 is
formed in a substantially partial conical shape with the origin at the top, and contour-like
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corresponding lines for correlating the estimated optical flow G2 with the sound pressure
difference amount S2 are provided on the map M8. The characteristics of the maps M10 and
M11 are set in advance by experiments or the like.
[0035]
The comparison unit 15 compares the perceptual optical flow F1 determined by the equation (1)
with the estimated optical flow F2 determined from the map M5 using the following equation to
determine the difference ΔF. ΔF = F2−F1 (3) The comparison unit 15 compares the perceptual
optical flow G1 determined by the equation (2) with the estimated optical flow G2 determined
from the map M6 using the following equation, and the difference ΔG Seeking. ΔG = G2-G1 (4)
The corner turning radius R is read from the map database 9a of the navigation system 7.
[0036]
Next, the sound effect generator 16 will be described. The sound effect generation unit 16
basically has a basic effect of a linear traveling state in which each next component wave sound
according to the traveling state is added to a fundamental wave sound (first-order component
wave sound) corresponding to the engine rotational speed during traveling A sound effect signal
SA and a basic sound effect signal SB for turning are generated, and the basic effect sound
signals SA and SB are corrected according to the driver's visual recognition state in each driving
state. It is generated. Hereinafter, the speaker inside the turning direction will be described as the
speaker 8a and the correction effect sound signal Sb1 corresponding to the speaker 8a, and the
speaker outside the turning direction will be described as the speaker 8b and the correction
effect sound signal Sb2 corresponding to the speaker 8b.
[0037]
First, basic sound effect generation processing will be described. When driving straight ahead,
multiply the 4th component sound wave of the map M1 by the gain a1, multiply the 6th, 8th
component sound wave of the map M1, and the gain a2, and correct the corrected 4, 6, 8th
component sound wave The basic sound effect signal SA in the straight running state is
generated by creating and adding these corrected 4, 6, and 8 order component wave sounds to
the fundamental wave sound. In the turning condition, the fourth, fourth and sixth component
wave sounds of the map M1 are multiplied by the gain b1, and the sixth, eighth, and third
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component wave sounds of the map M1 are multiplied by the gain b2 These corrected 4, 6, 8
order component wave sounds are added to the fundamental wave sound. Then, the 3.5th and
5.5th component wave sounds of the map M1 are multiplied by the gain c1 to create corrected
3.5 and 5.5 order component wave sounds, and these corrected 3.5 and 5.5 By adding the next
component wave sound to the fundamental wave sound into which the fourth, sixth, and eighth
component wave sounds are added, the basic sound effect signal SB in the turning condition is
generated. In order to generate the basic sound effect signal SB, the fourth, sixth, and sixth order
component sound waves correspond to the increase of the 3.5, 5.5 order component sound
waves so that the sound pressure level is maintained constant. Gain b1 and b2 are decreased.
[0038]
Next, the correction effect sound generation process will be described. The perceived optical
flows F1 and G1 have characteristics that decrease due to external factors that deteriorate the
driver's visibility such as weather (rainy weather) and illuminance (nighttime). Therefore, the
sound effect generation unit 16 corrects the basic sound effect signals SA and SB in a direction to
compensate for the decrease in the driver's sense of speed and the sense of turning caused by
the decrease in the perceived optical flows F1 and G1 due to external factors. ing.
[0039]
When traveling straight ahead and when the difference ΔF according to the equation (3) exists,
the sound pressure correction amount ΔS1 corresponding to the difference ΔF is set using the
map M7, and the sound pressure level of the basic sound effect signal SA is The correction effect
sound signal Sa is generated so as to increase by the sound pressure correction amount ΔS1. Sa
= SA × (1 + ΔS1 / SA) (5) The sound effect generator 16 outputs the corrected sound effect
signal Sa obtained by the equation (5) to the pair of left and right speakers 8a and 8b,
respectively, to thereby go straight ahead Creating sound effects. As a result, the reduction of the
optical flow, which is visual information, can be compensated by changing the sound pressure
level of the sound effect, which is auditory information, and the driver is given a proper sense of
speed.
[0040]
In the turning condition, when the difference ΔG according to the equation (4) exists, the sound
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pressure difference correction amount ΔS2 in the pair of left and right speakers 8a and 8b is set
using the map M8, and the speaker 8a inside the turning direction The correction effect sound
signals Sb1 and Sb2 are generated such that a sound pressure difference correction amount ΔS2
difference occurs in the sound pressure level of the speaker 8b outside the turning direction. Sb1
= SB.times. (1 + .DELTA.S2 / 2SB) Sb2 = SB.times. (1-.DELTA.S2 / 2SB) (6) Here, since a sense of
sound image localization with respect to the own traveling direction is generated, the sound in
the turning direction The pressure level is set to be higher than the sound pressure level on the
outer side in the rotational direction.
[0041]
Assuming that the coordinates on the map M8 corresponding to the perceived optical flow G1
are Ma and the coordinates on the map M8 corresponding to the estimated optical flow G2 are
Mb, the sound pressure difference amounts S2a and S2b corresponding to the respective
coordinates Ma and Mb are used. The sound pressure difference correction amount ΔS2 is
extracted based on the following equation. ΔS2 = S2b−S2a (7) Here, the difference between the
turning sense coordinates respectively corresponding to the coordinates Ma and Mb corresponds
to the decrease of the turning sense that the driver should obtain by visual information.
[0042]
The sound effect generator 16 outputs the correction effect sound signal Sb1 obtained by the
equations (6) and (7) to the speaker 8a inside the turning direction, and the speaker 8b outside
the turning direction outputs the equations (6) and (7) By outputting the corrected sound effect
signal Sb2 determined in step b), the sound effect of the turning state is created. As a result, it is
possible to complement the decrease in the optical flow, which is visual information, by changing
the sound pressure level of the sound effect, which is auditory information, and the driver is
given a proper turning feeling.
[0043]
Next, the operation and effects of the above-described vehicle sound effect generator will be
described. According to the sound effect generator 1, since the sound sound generation unit 16
controls the sound pressure characteristics of the speakers 8a and 8b in the direction of
eliminating the difference ΔG between the perceptual optical flow G1 and the estimated optical
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flow G2, the weather and the illuminance The driver can compensate for the driver's sense of
self-motion caused by the optical flow G1 reduced due to external factors that deteriorate
visibility such as by the sound effect, and optimize the driver's driving operation according to the
driving condition be able to. Furthermore, since the driving operation is optimized, the driver can
feel a sense of excitement and can enjoy the driving of the vehicle V.
[0044]
The speaker means comprises a pair of speakers 8a and 8b disposed on the left and right sides of
the driver, and when the sound effect generator 16 is in a turning state, the sound pressure
characteristics of the left speaker 8a and the right speaker 8b are differenced In order to control
in the direction of eliminating ΔG, the driver can obtain a turning feeling that matches the actual
corner turning radius R and the vehicle speed, and can practice a stable driving operation.
[0045]
In order for the sound effect generation unit 16 to make the sound pressure level of the speaker
8a on the turning direction side larger than the sound pressure level of the speaker 8b on the
opposite side to the turning direction, the driver A consistent sense of turning can be obtained
with certainty.
[0046]
A difference ΔG between the perceptual optical flow G1 and the estimated optical flow G2 by the
sound effect generator 16, a sense of turning recognized by the driver, and a difference between
the sound pressure level Sb1 of the left speaker 8a and the sound pressure level Sb2 of the right
speaker 8b Since the map M8 in which the correlation with ΔS2 is set is provided, the control
process can be simplified.
[0047]
Next, a modification in which the embodiment is partially changed will be described.
1) In the above embodiment, an example was described in which a pair of speakers were
disposed on the left and right side wall portions respectively, but may be disposed on instrument
panel portions respectively corresponding to the left and right sides of the driver. .
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Moreover, it is also possible to arrange at the left and right ends of the headrest of the driver.
Furthermore, in addition to the front speakers, a pair of left and right speakers may be provided
behind the driver since auditory self-motion sense works effectively from the rear sound source.
[0048]
2) In the above embodiment, an example was described in which the correction sound effect
signal was generated by uniformly increasing and decreasing the entire basic sound effect signal,
but the gain of the predetermined next component sound is increased or decreased to detect
perceptual optical flow. A corrected sound effect signal may be generated to eliminate the
difference between the and the estimated optical flow.
[0049]
3) In the above embodiment, an example was described in which the sound pressure level of the
pair of left and right speakers was provided with a difference as the sound pressure
characteristics in the turning state, but even if the time difference for the sound effect to reach
the driver is provided. good.
Specifically, a time difference index between the sound sound generation timing on the inner side
of the turning direction and the sound sound generation timing on the outer side of the turning
direction for each corner turning radius according to the vehicle speed is set in advance, and the
optical flow reduction is compensated. The difference in arrival time of sound effects to the
driver is read out from a pair of required speakers. The speaker on the opposite side of the
turning direction generates an effect sound later than the turning direction speaker by a
predetermined time difference. As a result, it is possible to compensate for the decrease in the
sense of self movement caused by the decrease in the optical flow while maintaining the sound
pressure levels of the left and right speakers constant.
[0050]
4) In the above embodiment, an example in which the gain map is switched between straight
running and turning is described, but control may be performed using a common map. In this
case, when driving straight ahead, a correction effect sound signal is generated to correct the
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sense of speed, and when turning, the sound of the speaker in the turning direction based on the
correction effect sound signal generated for speed sense correction The pressure level is
increased and corrected based on the sound pressure difference correction amount, and the
sound pressure level of the turning direction outer speaker is decreased and corrected based on
the sound pressure difference correction amount. This can further simplify control.
[0051]
5) Others, those skilled in the art can implement the embodiment in various modifications
without departing from the spirit of the present invention, and the present invention also
includes such modifications. is there.
[0052]
V Vehicle F1, G1 Perceptual optical flow F2, G2 Estimated optical flow ΔG Difference 1 Sound
effect generator 3 CCD camera 4 Rotational speed sensor 5 Accelerator opening sensor 7 Vehicle
speed sensor 8a, 8b Speaker 11 Driving state judgment unit 12 Perceptual optical flow detection
Part 13 Estimated optical flow detection part 15 Comparison part 16 Sound effect generation
part M8 Turning sensation correction map
11-04-2019
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