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JP2009051333

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DESCRIPTION JP2009051333
An object of the present invention is to let a vehicle occupant hear foreign sounds detected by
being adapted to the traveling state of a host vehicle. SOLUTION: A reproduction sound based on
the collected sound around the vehicle is created, the traveling state of the own vehicle is judged
based on the information related to the detected own vehicle, and output is made based on the
judged traveling state of the own vehicle Control the playback sound. [Selected figure] Figure 1
Auditory monitor for vehicles
[0001]
The present invention relates to a hearing monitor for a vehicle that collects extraneous sound
around a vehicle and reproduces the collected extraneous sound in a vehicle cabin.
[0002]
As a conventional hearing monitor for a vehicle, a plurality of microphones (simply referred to as
a microphone in this specification) detect the extraneous sound of an arbitrary surrounding
vehicle, and the sound source of the extraneous sound by the time difference of the extraneous
sound detected by the microphone There is one which notifies the driver of the situation of a
surrounding vehicle by detecting the position and outputting a sound in the direction of the
detected sound source position (see, for example, Patent Document 1).
[0003]
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1
Prior art documents related to the invention of this application are as follows.
Japanese Patent Application Laid-Open No. 05-085288
[0004]
Since the conventional auditory monitor apparatus for a vehicle is configured to output a sound
based on the distance between the detected sound source positions of the foreign sound to
determine whether or not to implement the alarm, If the detected sound source position is at a
short distance regardless of the situation, a sound alert is issued.
With such a configuration, for example, when another vehicle is traveling on the right lane of the
lane in which the own vehicle is traveling, the other vehicle is not intended to change lanes to the
right lane. It can be determined that it is not necessary to warn even if you are traveling at a
position close to the vehicle, but if it is a conventional auditory monitoring device for a vehicle,
the driver warns because it gives a warning based on the distance to other vehicles. There is a
problem that the vehicle interior becomes quiet and not comfortable environment because it
hears an unnecessary noise.
[0005]
Control of the reproduction sound to create the reproduction sound based on the collected sound
around the vehicle, determine the traveling state of the own vehicle based on the information
related to the detected own vehicle, and output based on the determined traveling state of the
own vehicle Do.
[0006]
According to the present invention, it is possible to provide a device for letting the vehicle
occupant hear the extraneous sound detected by adapting to the traveling state of the host
vehicle.
[0007]
<< Other Embodiments of the Invention >> An embodiment of the invention in which the vehicle
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hearing monitor device of the present invention is mounted on a vehicle will be described.
FIG. 1 shows the configuration of this embodiment.
The sound input unit 10 is installed near an outer wall around the vehicle to collect sounds
around the vehicle. As the sound input unit 10, microphones 210_1 to 210 ̶ n can be used, and
these microphones may be small enough to be attached to the outer wall of the vehicle, and a
general dynamic microphone or the like can be used.
[0008]
The vehicle information detection unit 111 detects vehicle information 110 such as map
information, position information, road traffic information, vehicle operation information, vehicle
speed information, a timer, etc. from a navigation device, GPS receiver, VICS receiver, various invehicle devices, etc. The switch unit 112, the filter unit 113, and the volume change unit 114 are
controlled. The switch unit 112 turns on and off the sound around the vehicle collected by the
sound input unit 10. The filter unit 113 performs filter processing on the sounds around the
vehicle collected by the sound input unit 10. The volume change unit 114 changes the volume of
the sound of the vehicle peripheral object output from the sound output unit 50.
[0009]
The first correction unit 30 processes the input electrical signals of the plurality of sounds into
an appropriate state, converts the signals into a desired number of channels (the number of input
channels of the second correction unit 40), and outputs the converted signals. The sound output
from the first correction unit 30 has to be theoretically equivalent to the desired sound at the
“control point” set near the driver's ears and near the head of the passenger on the passenger
seat. The configuration of the first correction unit 30 will be described in detail later.
[0010]
When the sound signal corrected by the first correction unit 30 is output from the speaker, the
second correction unit 40 removes the influence of the transmission system from the speaker to
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the control point, and the sound corrected by the first correction unit 30 The sound signal is
corrected so that the signal is faithfully reproduced as a sound at the control point. The
configuration of the second correction unit 40 will be described in detail later.
[0011]
The sound output unit 50 amplifies the sound signal output from the second correction unit 40
and outputs the signal from a speaker. The sound output unit 50 is configured using an
amplification device (not shown) and the speakers 290_1 to 290_n. As the amplification device
and the speakers 290_1 to 290_n, general ones that can be arranged on the vehicle may be used.
[0012]
FIG. 2 is a diagram for explaining the operation of the hearing monitor when passing a toll plaza
on a highway, and FIG. 3 is a flowchart showing the operation. When traveling on an expressway
or entering an expressway, the distance to the toll booth is acquired from the map information
from the navigation device, for example, when it becomes 500 m (A in FIG. 2, S211 in FIG. 3) The
output sound of the hearing monitor device is gradually increased and faded in (S212 in FIG. 3),
and the driver is made to listen to the sound of the object around the vehicle. After that, the
distance from the toll booth is acquired from the map information from the navigation device,
and when the vehicle passes through the toll booth and travels, for example, 100 m (B in FIG. 2,
S213 in FIG. 3) Gradually make it smaller and fade out (S214 in FIG. 3) to end the provision of
the sound of the object around the vehicle to the driver. As a result, in many cases, it is difficult
for the driver to determine the direction of travel at a tollgate that intertwines with other vehicles
in a complicated manner, so it is possible to determine the direction of travel of the vehicle with
reference to the surrounding information sound.
[0013]
FIG. 4 is a diagram for explaining the operation of the hearing monitor at the time of lane change,
and FIG. 5 is a flowchart showing the operation. When the driver performs a blinker operation to
change lanes (FIG. 4 (a), S 221 in FIG. 5), the output sound of the hearing monitor device is
gradually increased and faded in (FIG. 4 (b), FIG. 5) to have the driver listen to the sounds of
objects around the vehicle. After traveling for 30 m or 5 seconds after the end of the blinker
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operation (FIG. 4 (c), S 223 in FIG. 5), the output sound of the hearing monitor device is gradually
reduced and faded out (FIG. 4 (d), FIG. S224). In addition, when traveling speed is high, you may
fade in from a front. Since the hearing monitor is operated at the timing when the blinker is
operated, it is possible to identify a vehicle approaching from behind when changing lanes. In
addition, since the information sound is not output at all times, the annoyance is eliminated.
[0014]
FIG. 6 is a diagram for explaining the operation of the hearing monitor when approaching an
intersection, and FIG. 7 is a flowchart showing the operation. When the distance to the
intersection is acquired by the map information from the navigation device and the distance to
the intersection becomes 50 m or less and approaches the intersection (Fig. 6 (a), S231 in Fig. 7)
Regardless of the above, the output sound of the hearing monitor device is gradually increased
and faded in (FIG. 6 (b), S232 in FIG. 7), and the driver is made to listen to the sound of the
vehicle peripheral object. When the distance from the intersection is acquired by the map
information from the navigation device and the distance from the intersection becomes, for
example, 50 m or more and the passage of the intersection is confirmed (Fig. 6 (c), S233 of Fig.
7) The output sound of is gradually reduced and faded out (S234 in FIG. 7). At intersections,
there are vehicles that turn straight and turn left and right, pedestrians, etc., and there are many
accidents, so visual information can be followed by listening to the information sound around the
host vehicle.
[0015]
FIG. 8 is a view for explaining the operation of the hearing monitor when entering the service
area, and FIG. 9 is a flowchart showing the operation. When the entrance to the service area is
detected by the map information from the navigation device (A in FIG. 8, S241 in FIG. 9), the
output sound of the hearing monitor device is gradually enlarged and faded in (S242 in FIG. 9) ,
Make the driver listen to the sounds of objects around the vehicle. When stop of the engine is
detected in the service area by the engine operation information from the engine control unit (B
in FIG. 8 and S243 in FIG. 9), the output sound of the hearing monitor device is gradually
reduced and faded out (FIG. S244 of 9). After that, when the start of the engine is detected by the
engine operation information from the engine control unit (S245 in FIG. 9), the output sound of
the hearing monitor device is gradually increased and faded in (S246 in FIG. 9) When it is
detected that the vehicle travels 100m after joining the main line according to the map
information from the navigation device (C in FIG. 8 and S247 in FIG. 9), the output sound of the
hearing monitor device is gradually reduced and faded out ( S247 of FIG. 9). In the service area,
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pedestrians often come out from among vehicles, pedestrians are walking by the side of their
own vehicle, and other vehicles are suddenly receding, so they hear information sounds around
their own vehicles. By doing this, the attention to the surroundings becomes easy.
[0016]
FIG. 10 is a diagram for explaining the operation of the hearing monitor when leaving the road,
and FIG. 11 is a flowchart showing the operation. When it is detected that the road has left by the
map information from the navigation device, for example, when entering a parking lot in a site
such as a department store or a supermarket (A in FIG. 10, S251 in FIG. 11), the output of the
hearing monitoring device The sound is made gradually louder and faded in (S 252 in FIG. 11),
and the driver is made to listen to the sound of the object around the vehicle. When stop of the
engine is detected according to the engine operation information from the engine control device
in the state of leaving the road (B in FIG. 10, S 253 in FIG. 11), the output sound of the hearing
monitor device is gradually reduced and faded out (S254 in FIG. 11).
[0017]
When leaving the road and the engine is stopped, it is possible that the occupants will shop at a
department store or supermarket, eat at a restaurant etc., and it is assumed that the parking time
will be somewhat long, so the hearing monitor device The operation of is temporarily stopped
(S255 in FIG. 11). After that, when the start of the engine is detected from the engine operation
information from the engine control unit (C in FIG. 10, S 256 in FIG. 11), the hearing monitor is
operated and the output sound is gradually increased to fade Turn on (S257 in FIG. 11).
Furthermore, when it is detected that the vehicle has returned to the road and traveled, for
example, for 30 m or 5 seconds by the map information from the navigation device (D in FIG. 10,
S259 in FIG. 11), the output sound of the hearing monitor device is gradually reduced And fade
out (S260 in FIG. 11). In parking lots such as department stores and supermarkets, there are
many pedestrians such as family members and elderly people, and there are other vehicles that
suddenly move. Therefore, listening to the information sound around the host vehicle makes it
easy to get around.
[0018]
FIG. 12 is a diagram for explaining the operation of the hearing monitor when getting caught in a
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traffic jam, and FIG. 13 is a flowchart showing the operation. When traffic information on a
traveling road is acquired from a VICS receiver (A in FIG. 12, S261 in FIG. 13) and the vehicle
enters a traffic congestion area (B in FIG. 12, S262 in FIG. 13) It is gradually enlarged and fades
in (S263 in FIG. 13), and the driver is made to listen to the sound of an object around the vehicle.
When it is detected that you have traveled, for example, 30 m after entering a traffic jam area
according to travel distance information from the on-vehicle device (C in FIG. 12 and S 264 in
FIG. 13), reduce the output sound level of the hearing monitor device by 3 dB, for example
Relieve “noisiness” (S265 in FIG. 13). After that, when departure from the traffic area is
detected by traffic information from a VICS receiver or an in-vehicle device (D in FIG. 12 and
S266 in FIG. 13), the output sound of the hearing monitoring device is gradually reduced and
faded out. (S267 in FIG. 13). In particular, when there is a traffic jam on a general road, since
there are a motorbike passing through the vehicles and pedestrians crossing the road, it is
possible to easily confirm their movement by listening to the information sound around the host
vehicle. However, since it feels loud at the same level as the information sound output at the time
of traveling, for example, when traveling at 10 km / h or less, the 3 dB level is lowered.
[0019]
FIG. 14 is a view for explaining the operation of the hearing monitor when approaching a level
crossing, and FIG. 15 is a flowchart showing the operation. A crossing is detected in front of the
traveling road based on map information from the navigation device (A in FIG. 14, S271 in FIG.
15), and when the distance to the crossing is 10 m, for example (B in FIG. 14, S272 in FIG. 15).
The output sound of the hearing monitor device is gradually increased and faded in (S273 in FIG.
15), and the driver is made to listen to the sound of the object around the vehicle. Thereafter,
when passage of the crossing is detected by map information from the navigation device (C in
FIG. 14, S 274 in FIG. 15), the output sound of the hearing monitor device is gradually reduced
and faded out (S 275 in FIG. 15). . By listening to the information sound around the vehicle
around the crossing, it becomes easy to confirm the presence of a pedestrian crossing the
approach and crossing of the train without opening the window.
[0020]
FIG. 16 is a diagram for explaining the operation of the hearing monitor after engine start, and
FIG. 17 is a flowchart showing the operation. When the start of the engine is detected by the
engine operation information from the engine control unit (S281 in FIG. 17), the output sound of
the hearing monitor device is gradually increased and faded in (S282 in FIG. 17). Listen to the
sounds of objects around the vehicle. After that, for example, when it is detected that the vehicle
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travels 10 m according to the traveling distance information from the in-vehicle device (S283 in
FIG. 17), the output sound of the hearing monitor device is gradually reduced and faded out
(S284 in FIG. 17). In particular, by listening to the information sound around the host vehicle
when moving the vehicle after starting the engine in a home parking lot or the like, it is possible
to easily confirm the presence of surrounding children and the like.
[0021]
FIG. 18 is a view for explaining the operation of the hearing monitor when the winker or the
hazard switch is operated, and FIG. 19 is a flowchart showing the operation. When the operation
of the blinker or the hazard switch is detected by the driving operation information from the invehicle device (FIGS. 18A to 18C, S 291 in FIG. 19), the output sound of the hearing monitor
device is gradually enlarged and faded The driver turns on (S292 in FIG. 19) to cause the driver
to listen to the sound of objects around the vehicle. Thereafter, when the turn signal or hazard
switch is detected to be off according to the driving operation information from the in-vehicle
device (S293 in FIG. 19), the output sound of the hearing monitor device is gradually reduced
and fades out, for example, after 5 seconds (FIG. 19). S294). When changing the position or the
direction of the host vehicle, there are many operation items, and by listening to the information
sound around the host vehicle, it is possible to avoid danger such as entrainment or rear impact.
[0022]
FIG. 20 is a diagram for explaining the operation of the hearing monitor at the time of steering
operation, and FIG. 21 is a flowchart showing the operation. When the steering is rotated by a
predetermined angle or more according to the steering angle information from the in-vehicle
device (Fig. 20 (a), S301 in Fig. 21), it is judged that the position or the direction of the vehicle is
changed. The sound is gradually made loud and faded in (S302 in FIG. 21), and the driver is
made to listen to the sound of an object around the vehicle. It is detected from the steering angle
information from the on-vehicle device that the steering has returned to the reference position
(FIG. 20 (b), S303 in FIG. 21), and for example, when 5 seconds have elapsed (S305 in FIG. 21)
The output sound of the device is gradually reduced and faded out (S306 in FIG. 21). When
changing the position or the direction of the host vehicle, there are many operation items, and by
listening to the information sound around the host vehicle, it is possible to avoid danger such as
entrainment or rear impact.
[0023]
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8
FIG. 22 is a diagram for explaining the operation of the hearing monitor during crawling, and
FIG. 23 is a flowchart showing the operation. When the vehicle speed is, for example, 10 km / h
or less according to the vehicle speed information from the in-vehicle device (A in FIG. 22, S311
in FIG. 23), it is determined that slowing down, the output sound of the hearing monitor device is
gradually enlarged and faded in ( In step S312 of FIG. 23, the driver listens to the sounds of
objects around the vehicle. After that, when the vehicle speed exceeds, for example, 15 km / h
according to the vehicle speed information from the in-vehicle device (B in FIG. 22, S313 in FIG.
23), the output sound of the hearing monitor device is gradually reduced and faded out (FIG.
S314). When traveling in a traffic jam or traveling in a place where there are many pedestrians
etc., by listening to the information sound around the host vehicle, it is possible to feel the sign of
the surroundings and avoid contact accidents and the like.
[0024]
FIG. 24 is a view for explaining the operation of the hearing monitor when the low speed
traveling continues for a predetermined time, and FIG. 25 is a flowchart showing the operation.
When low-speed traveling of, for example, 10 km / h or less continues for, for example, 10
seconds or more according to vehicle speed information from a vehicle-mounted device and a
timer (A in FIG. 24, S321 to S322 in FIG. 25) The sound is gradually made louder and faded in
(S323 in FIG. 25), and the driver is made to listen to the sound of an object around the vehicle.
After that, when the vehicle speed exceeds, for example, 15 km / h according to the vehicle speed
information from the in-vehicle device (B in FIG. 24, S324 in FIG. 25), the output sound of the
hearing monitor device is gradually reduced and faded out (FIG. 25). S325). When traveling in a
traffic jam or traveling in a place where there are many pedestrians etc., by listening to the
information sound around the host vehicle, it is possible to feel the sign of the surroundings and
avoid contact accidents and the like.
[0025]
FIG. 26 is a diagram for explaining the operation of the hearing monitor at the time of reverse
traveling, and FIG. 27 is a flowchart showing the operation. When the shift lever is set to the
reverse position according to shift information from the on-vehicle device (S331 in FIG. 27), it is
determined that the vehicle is moving backward to the parking lot as shown in FIGS. 26 (a) and
26 (b). The output sound of the monitor device is gradually increased and faded in (S332 in FIG.
27), and the driver is made to listen to the sound of an object around the vehicle. After that, when
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the shift lever is set to the parking position according to the shift information from the in-vehicle
device (S333 in FIG. 27), it is determined that the parking operation is completed, and the output
sound of the hearing monitoring device is gradually reduced and faded out. (S334 in FIG. 27). On
the other hand, when the shift lever is set to the traveling position in the parking state (S333 →
S335 in FIG. 27) and the vehicle speed exceeds, for example, 10 km / h according to the vehicle
speed information from the on-vehicle device (S336 in FIG. 27) The output sound of is gradually
reduced and faded out (S334 in FIG. 27). By listening to the information sound around the host
vehicle while the host vehicle is moving backward, it is possible to follow the driver's
surroundings check.
[0026]
FIG. 28 is a view for explaining the operation of the hearing monitor when entering a tunnel, and
FIG. 29 is a flowchart showing the operation. While outputting the sound of an object around the
vehicle from the hearing monitor device (A in FIG. 28, S341 in FIG. 29), map information from
the navigation device and in-vehicle device, illumination light information, to microphones 210_1
and 210_n (see FIG. 1) When the entry into the tunnel is detected by the input level of (E in FIG.
28B, S 342 in FIG. 29), the input level to the microphones 210_1 and 210_n (see FIG. 1)
temporarily increases. The level of the output sound of is reduced by, for example, 3 dB (S343 in
FIG. 29). Thereafter, when it is detected that the vehicle has exited the tunnel based on the map
information from the navigation device and the in-vehicle device and the lighting light
extinguishing information (C in FIG. 28, S 344 in FIG. 29), the output sound level of the hearing
monitor device Raise 3 dB and return to the level before entering the tunnel (S345 in FIG. 29).
This makes it possible to present the surrounding information sound without giving the user an
unpleasant feeling.
[0027]
FIG. 30 is a diagram for explaining the operation of the hearing monitor when entering a school
zone or a silver zone, and FIG. 31 is a flowchart showing the operation. When entering a
traveling road such as a school zone or a silver zone, which must travel slowly according to
traveling road information from a navigation device or a VICS receiver (S 351 in FIG. 31),
gradually increase the output sound of the hearing monitoring device It fades in (S352 of FIG.
31), and the driver is made to listen to the sound of an object around the vehicle. After that, when
passing through a traveling road such as a school zone or a silver zone, which is required to
travel slowly according to traveling road information from a navigation device or a VICS receiver
(S353 in FIG. 31), the output sound of the hearing monitor device is gradually reduced And fade
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out (S354 in FIG. 31). The driver can be made aware that he is traveling in the school zone or
silver zone, and the attention to the surroundings is improved.
[0028]
FIG. 32 is a diagram for explaining the operation of the hearing monitor when entering a coastal
street or a forest road, and FIG. 33 is a flowchart showing the operation. When it is detected that
a road set in advance, such as a coastal street or a forest road, is reached by map information
from the navigation device (A in FIG. 32, S361 in FIG. 33), the output sound of the hearing
monitoring device is gradually increased It fades in (S362 of FIG. 33), and the driver is made to
listen to the sound of the vehicle peripheral object. Thereafter, when it is detected that the road
has been set in advance by map information from the navigation device (S363 in FIG. 33), the
output sound of the hearing monitor device is gradually reduced and faded out (S364 in FIG. 33).
As a result, it is possible to provide the hearing monitor with entertainment properties and to
provide enjoyment during driving, a relaxing effect, and the like.
[0029]
FIG. 34 is a view for explaining a method of suppressing the traveling sound of the vehicle
among the sounds around the vehicle detected by the sound input unit 10 (see FIG. 1), and FIG.
35 is a flowchart showing the procedure. While outputting the sound of an object around the
vehicle from the hearing monitor (S371 in FIG. 35), the vehicle speed information is acquired
from the in-vehicle device (S372 in FIG. 35), and the band pass filter used in the filter unit 113 is
changed according to the vehicle speed. (S373 to S376 in FIG. 35). For example, filter A is
selected when the vehicle speed is lower than 30 km / h, filter B is selected when the vehicle
speed is 30 km / h or more and 80 km / h or less, and filter C is selected when the vehicle speed
is 80 km / h or more. select. These band pass filters A, B, and C operate to eliminate the traveling
noise of the vehicle from the input noise around the vehicle when traveling at the respective
vehicle speeds. The selected band pass filter process is applied to the sounds around the vehicle
detected by the sound input unit 10 (S377 in FIG. 35), and the above-described processes are
performed by the amplification unit 20, the first correction unit 30, and the second correction
unit 40 Thereafter, the sound output unit 50 outputs the sound (S378 in FIG. 35). As a result,
since the sound of the host vehicle can not be heard, the surrounding information sound can be
provided naturally.
[0030]
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<< Another Embodiment of the Invention >> Another embodiment of the invention in which the
vehicle hearing monitor device of the present invention is mounted on a vehicle will be
described. FIG. 36 is a block diagram showing a basic configuration of the embodiment, and FIG.
37 is a view showing a specific configuration of the embodiment. The sound input unit 10 is
installed near an outer wall around the vehicle to collect sounds around the vehicle. As the sound
input unit 10, microphones 210_1 to 210_n can be used as shown in FIG. 37, and these
microphones should be small enough to be attached to the vehicle outer wall, and use a general
dynamic microphone etc. Can.
[0031]
Here, a method of attaching the microphones 210_1 to 210 ̶ n to a vehicle will be described. At
least two or more microphones 210_1 to 210_n are provided, and in these microphones, a
sufficient distance is provided so that sounds coming from one sound source have large
differences in characteristics such as time, frequency, sound pressure level, etc. Placement.
Ideally, it is desirable that two sounds input from two microphones be established as a binaural
sound source. Actually, since the sound recorded by the microphone attached to the outer wall of
the vehicle is different from the sound recorded by the microphone disposed at the pinnacle
position such as the dummy head, the binaural recording is performed in a pseudo manner.
[0032]
For example, as shown in FIG. 38, a dome-shaped casing (of the same size as a human head)
having a shape close to a dummy head on the roof of a vehicle or the like, and artificial auricles
attached to the casing left and right Attach a microphone in the ear canal of to collect sound.
Further, for example, as shown in FIG. 39, a pseudoauricle is attached to the outer wall of the
vehicle, and a microphone is attached in the external ear canal of these auricle to collect sound.
In such a configuration, although the input signal is different from the actual binaural recording,
a similar sound is obtained with respect to the user in terms of forming a sound image in a
desired direction. At this time, it is preferable that the microphone be as close to a wall as
possible to easily make a difference between the sound signals input to the left and right
microphones, and a maximum of 10 cm or less is desirable. If the sound coming from the
traveling direction and the rear is merely discriminated, a certain effect can be obtained by
providing a wall behind the microphone as shown in FIG.
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[0033]
In FIGS. 36 and 37, the amplification unit 20 converts the collected sound into an electrical
signal of an appropriate magnitude. As the amplification unit 20, a general filter-equipped
microphone amplifier 220 as shown in FIG. 37 may be used.
[0034]
The first correction unit 30 processes the input electrical signals of the plurality of sounds into
an appropriate state, converts the signals into a desired number of channels (the number of input
channels of the second correction unit 40), and outputs the converted signals. The first
correction unit 30 includes an AD converter 230, an arithmetic unit 240, a storage unit 245, and
a DA converter 270 shown in FIG. The sound output from the first correction unit 30 has to be
theoretically equivalent to the desired sound at the “control point” set near the driver's ears
and near the head of the passenger on the passenger seat. The configuration of the first
correction unit 30 will be described in detail later.
[0035]
When the sound signal corrected by the first correction unit 30 is output from the speaker, the
second correction unit 40 removes the influence of the transmission system from the speaker to
the control point, and the sound corrected by the first correction unit 30 The sound signal is
corrected so that the signal is faithfully reproduced as a sound at the control point. The second
correction unit 40 includes an AD converter 230, an arithmetic unit 240, a storage unit 245, and
a DA converter 270 shown in FIG. The configuration of the second correction unit 40 will be
described in detail later.
[0036]
As shown in FIG. 41, for the first correction unit 30 and the second correction unit 40, separate
first and second calculation units 240 and 250, first storage unit 245 and second storage unit
255, respectively. The AD converters 230 and 262 and the DA converters 261 and 270 may be
used. In this case, the AD converter 230, the first arithmetic unit 240, the first storage unit 245,
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and the DA converter 261 constitute a first correction unit 30, and the AD converter 262, the
second arithmetic unit 250, and the second storage unit. The second correction unit 40 is
configured by the 255 and the DA converter 270.
[0037]
The sound output unit 50 amplifies the sound signal output from the second correction unit 40
and outputs the signal from a speaker. The sound output unit 50 is configured using the
amplification device (speaker amplifier) 280 and the speakers 290_1 to 290_n shown in FIG. As
the amplification device 280 and the speakers 290_1 to 290_n, general ones that can be
arranged on the vehicle may be used. The head position detection device 300 shown in FIG. 37
detects the head position of the driver. For example, the position of the driver's seat may be
detected by a sensor and converted to the head position of the driver. Although details will be
described later, the filters used in the first correction unit 30 and the second correction unit 40
are switched according to the head position of the driver.
[0038]
FIG. 42 is a flowchart showing an operation of the embodiment. The hearing monitor for a
vehicle according to one embodiment performs this operation when the power is turned on. First,
in step 110, initialization is performed. At the time of initial setting, the filters used in the first
correction unit 30 and the second correction unit 40 are read. In step 120, the sound collected
by the sound input unit 10 is input and converted into an electrical signal. In the following step
130, the sound signal is amplified to an appropriate level.
[0039]
At step 140, a first correction process is performed. That is, the sound signal is discretely
converted to perform correction filter processing and channel integration processing, and the
obtained signal is converted as it is or to a continuous signal. Next, in step 150, a second
correction process is performed. That is, if the sound signal after the first correction processing is
a continuous signal, discrete conversion is performed, correction filter processing is performed,
and then conversion to a continuous signal is performed. The details of the first correction
process and the second correction process will be described later. At step 160, the sound signal
after correction processing is amplified, and at step 170, it is output from the speaker. In step
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180, the head position of the driver is detected, and if the head position has changed, the process
proceeds to step 190, and the contents of the filter used in the first correction process and the
second correction process are changed.
[0040]
Note that the signals in the series of processing are AD conversion processing and DA conversion
processing before and after the first correction processing and the second correction processing
in the case of a continuous signal such as an electrical signal, and these signals can be obtained
as discrete signals. The first correction process and the second correction process are performed
without performing the AD conversion process and the DA conversion process. In the first
correction process and the second correction process, it is desirable to apply a discrete filter
from the viewpoint of cost and the like, but a filter capable of continuous processing may be
applied.
[0041]
The detailed configuration of the first correction unit 30 and the first correction process will be
described. First, an example in which the first correction unit 30 is configured to perform
pseudo-binaural recording will be described. Using the method described with reference to FIGS.
38 and 39, input sounds recorded by two microphones are pseudo-binauralized. That is, in
comparison with sounds recorded with a dummy head or a microphone placed inside the pinnae
of the Head And Torso Simulator, at least the direction of the sound image sounds the same.
When the first correction unit 30 filters the sound source collected in this state, it is desirable to
perform processing so that the content of the sound source is not changed. For example, in FIG.
38, the filters in the time domain of the first correction unit 30 (first correction processing) that
applies the input from the microphone 210_1 to X1 and the input from the microphone 210_2
to X2 respectively are H1, H2, and Assuming that the outputs from the correction unit 30 (first
correction processing) are Y1 and Y2, Y1 = X1 * H1 (1), Y2 = X2 * H2 (2) In the equations (1)
and (2), the description “A * B” represents a convolution operation of the vector A and the
vector B. At this time, Y1 and Y2 may be equivalent to X1 and X2, so filters H1 and H2 have one
tap and one coefficient, or any number of taps N (and the same time for H1 and H2). It is
desirable to use a time delay filter with a factor of 1). For example, H1 = H2 = 1 (3), H1 = H2 = [0,
1, 0, 0, 0, 0, 0] (N = 7 taps, time delay 1 tap) (4) This can be realized by the configuration of
[0042]
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Next, an example of the case where the first correction unit 30 constructs an acoustic space such
as when a window is opened using a virtual sound source will be described. In this example, a
virtual sound source is used to construct a sound image so that the environmental sound around
the vehicle can be heard as if the window of the vehicle was opened. FIG. 43 (a) shows an
example of how ambient sound around the host vehicle can be heard with the left and right
windows of the host rear seat opened. At this time, the driver can hear the sound entering from
the rear window as a sound source localized to the rear. For example, the vehicle 1 and the
vehicle 3 around the own vehicle are located relatively backward from the driver, and when the
left and right windows of the rear seat are opened, they are localized and sounded at that
position. On the other hand, the vehicle 2 is positioned relatively to the right from the driver, and
when the rear seat right and left windows are opened, the diffracted sound from the window and
the direct sound through the front window come.
[0043]
Therefore, a method is considered to reproduce the situation shown in FIG. 8A by reproducing
only the sound coming from the window when the window is opened. As a primitive method, as
shown in FIG. 43 (b), a method is considered in which microphones are placed outside the
window and the input signals from these microphones are reproduced as they are using the
speaker placed inside the window as they are. Be When this method is used, it is necessary to
arrange a speaker inside the window, and it is expected that this will be difficult in a vehicle
having a limited arrangement of equipment. Therefore, in this embodiment, as shown in FIG. 43
(c), the first and second correction units arrange the speaker from the input signal from the
microphone disposed outside the vehicle at a position away from the microphone. It is controlled
to come from the outside of the window by virtual sound image reproduction technology.
[0044]
FIG. 44 shows a configuration example of the first correction unit 30. The signals input from the
microphones 210_1 to 210 ̶ n are subjected to Gnm filter processing, separately added as
signals of left and right channels, and output to the first correction unit 40. Here, n represents a
microphone number, and m represents an input channel number of the second correction unit
40. The signals input from the microphone n with the number n are processed by the filters Gn1
and Gn2, and added for each input channel (m = 1, 2 in this example) and for each time element.
10-05-2019
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[0045]
FIG. 45 shows a configuration example of the filters G11 and G12 in the time domain
corresponding to the microphone 210_1 arranged on the vehicle outer wall on the right side of
the rear seat. The filters G11 and G12 indicate, for example, the delay and distance attenuation
from the position of the microphone 210_1 (the position of a virtually open window or a position
of a virtually assumed window) to the driver's head (near both ears). Here, the case of a delay
unit using a 9-tap FIR filter is shown. In addition, the position of the retarder can be easily
calculated physically by a geometric method, for example, by measuring the distance on CAD and
measuring the arrival time by using the sound velocity, so that it is extremely simply desired. A
filter can be configured.
[0046]
FIG. 46 shows another configuration example of the filters G11 and G12 corresponding to the
microphone 210_1 disposed on the vehicle outer wall on the right side of the rear seat. The
filters G11 and G12 use a transfer function from the position of the microphone 210_1 (the
position of a virtually open window or a position of a virtually assumed window) to the driver's
head (near both ears). Here, the case of a transfer function using a 10-tap FIR filter is shown. The
transfer function can be realized by measuring in advance the acoustic transfer system from the
position of the microphone 210_1 to the vicinity of the driver's ears.
[0047]
In the case of constructing an acoustic space such as when a window is opened using a virtual
sound source by the first correction unit 30, unlike in the above-described binaural recording
system, the microphone is disposed at the window position to be virtually set. And add the
outputs of each microphone after filtering. With such a configuration, sounds virtually arriving
from various directions can be reproduced, for example, at the left and right positions of the ear.
[0048]
In addition, although the example which installed microphone 210_1 only in back is shown in
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FIG. 45 and FIG. 46, as shown, for example in FIG. 47, six microphones 210_1-210_6 are the
windows of backseat right and left, the windows of front seat right and left, front When arranged
at six positions of the window and the rear window and corresponding to the six directions, it is
possible to obtain an acoustic field of view in the horizontal direction of 360 degrees. In this
case, by allowing the driver to arbitrarily select the microphone to be used, it is possible to
configure an acoustic view as if the driver had opened only the favorite virtual window.
[0049]
Next, the detailed configuration of the second correction unit 40 and the second correction
process thereof will be described. FIG. 48 is a view for explaining the concept of the second
correction unit 40. As shown in FIG. The second correction unit 40 is configured such that the
input signals Y1 and Y2 from the first correction unit 30 described above are reproduced at
control points C1 and C2 set near the driver's ears. Between the input signals Y1 and Y2 from the
first correction unit 30 and the reproduced signals (observed signals) Z1 and Z2 at the control
points C1 and C2, Y1 = Z1 (5), Y2 = Z2.・ It is desirable that the relationship of (6) be
established. Therefore, in this embodiment, a filter for correction is used to remove the influence
of the space transfer system. Hereinafter, this filter is called "inverse filter".
[0050]
The configuration and calculation method of the inverse filter used in the second correction unit
40 will be described with reference to FIG. Assuming that an input signal Yn, an inverse filter
Hmn (m is a sound source number, n is a control point number), a reproduced signal (observed
signal at a control point) Zn and a space transfer characteristic Fnm for each arbitrary frequency
, F · H · Y = Z (7) In the equation (7), F, H, Y and Z are vectors, which are represented by the
determinants of F = [F nm], H = [H mn], Y = [Y n], and Z = [Zn]. At this time, in order to satisfy the
relationship of the equations (5) and (6), F · H = I (8) (I is a unit vector) is required. Therefore, in
order to derive H from F, it is sufficient to calculate H = F <-> (9) for every arbitrary frequency. In
equation (9), [·] <−> represents a general inverse of the matrix [·]. For example, the calculation
method described in "Application of inverse filter design using minimum norm solution to
transaural system: Proceedings of the Acoustical Society of Japan, pp. 495-496 (1998)" can be
employed.
[0051]
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Next, a method of preventing the occupants other than the driver from hearing the
environmental noise outside the vehicle will be described. In this embodiment, safety and the like
are improved by presenting environmental sounds outside the vehicle to the driver so that they
can be heard from the positions of the sound sources, but the environmental sound presented is
an occupant other than the driver, For example, it is not necessarily useful for the front
passenger, and the system is constructed so that these environmental sounds can not be heard in
the front passenger seat.
[0052]
50 and 51, the configuration of the reverse filter of the second correction unit 40 for preventing
the passenger on the passenger seat from hearing the environmental sound outside the vehicle
will be described. First, the reverse filter configuration shown in FIG. 50 shows an example of
four speakers S1 to S4 and three control points C1 to C3. In this configuration, the inverse filter
is designed such that the relation of Xn = Yn is established between the input signal Xn and the
observation signal Yn observed at the control point. Now, when input waveforms X1 and X2
respectively have substantial waveforms and a silence signal, ie, a serial signal of amplitude 0 is
input to input signal X3, Y1 = X1 and Y2 = X2 are satisfied, and Y3 = 0 can also be established
simultaneously. Then, by setting control points C1 and C2 near the driver's ears and setting
control point C3 near the passenger seat occupant's head, the driver hears an environmental
sound outside the vehicle and the passenger seat occupant Can make it impossible to hear
environmental sounds outside the car. Ideally, it is desirable to set control points C3 and C4 in
the vicinity of the passenger's seat passenger's ears and set Y3 = Y4 = 0.
[0053]
The inverse filter configuration shown in FIG. 51 shows an example in which redundant filters
are omitted from the inverse filter configuration shown in FIG. In this case, even with four
speakers and three control points, the system can be configured with eight filters. However,
when the inverse filter is constructed based on the system of FIG. 50, it is possible to reduce 12
filters to eight, and designing with eight filters from the beginning does not provide the same
effect. . As described above, by providing the control points at the respective seats in the vehicle
compartment, it is possible to simultaneously realize the control for generating the sound and the
control for erasing the sound.
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[0054]
Next, an example in which the filter is switched according to the change in the head position of
the driver will be described. The first correction unit 30 and the second correction unit 40
change the first correction unit 30 and the second correction unit 40 according to the change of
the head position because the reproduction accuracy etc. is lowered due to the change of the
head position of the driver. It is desirable to do. After the head position of the driver is detected
by the head position detection apparatus 300 shown in FIG. 37, the filter of the first correction
unit 30 and the filter of the second correction unit 40 stored in advance in the storage unit 245
Select according to the head position.
[0055]
Specifically, as shown in FIG. 52, from the microphone to the driver's both-ears position from the
head position P1 when the driver's seat is moved to the foremost position and the head position
P2 when moved to the last portion The filters Gnm (1) and Gnm (2) obtained from the transfer
function of the above are stored in advance, and the filter of the first correction unit 30
corresponding to the position of the seat is selected. Similarly, as an example of selection of the
second correction unit filter, as shown in FIG. 53, the head position P1 when the driver's seat is
moved to the foremost portion and the head position P2 when the driver's seat is moved to the
last portion The inverse filters Hmn (1) and Hmn (2) obtained from the transfer function from
the microphone to the driver's binaural position in are stored in advance, and the inverse filter of
the second correction unit 40 is selected according to the position of the seat .
[0056]
Thus, according to one embodiment, a plurality of microphones for collecting sounds around the
vehicle are installed on the outer periphery of the vehicle body, a plurality of speakers are
arranged in the vehicle compartment, and the microphones exist around the vehicle by the
plurality of microphones. The sound including position information is input from the object, and
the sound of the object around the vehicle is output to the vehicle occupant with the position
information maintained by the plurality of speakers. More specifically, a first correction process
for correcting the sound collected by a plurality of microphones so that the sound of a vehicle
peripheral object can be heard from the direction in which the vehicle peripheral object is
present to the vehicle occupant; Since the second correction process for correcting the output
sound of the first correction process is performed so that the output sound of the speaker in the
10-05-2019
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second case becomes equal to the sound after the correction by the first correction process, the
vehicle occupant is suddenly warned In addition to being able to prevent the occurrence of
transfer and take appropriate measures in accordance with cognitive resources, it is inexpensive
to let the vehicle occupant hear the sounds of multiple objects around the vehicle with the
window of the vehicle closed. An apparatus can be provided.
[0057]
Further, according to one embodiment, two microphones are arranged on the left and right of the
vehicle, and the sound collected by these two microphones is corrected to binaural sound, so the
sound from the vehicle peripheral object is The vehicle occupants can hear the sounds of objects
around the vehicle as if naturally coming from an open window.
[0058]
According to one embodiment, a dummy head is attached to the outer periphery of the vehicle,
and two microphones are disposed in the left and right auricles of the dummy head, and the
sound collected by these two microphones is corrected to binaural sound Thus, the vehicle
occupant can hear the sound of the vehicle peripheral object so that the vehicle occupant directly
hears the sound from the vehicle peripheral object with both ears.
[0059]
According to one embodiment, two microphones are disposed on the left and right of the vehicle,
and sound is collected by the two microphones so that the sound of the vehicle peripheral object
can be heard from the direction of the vehicle peripheral object through any window of the
vehicle. Was made to correct the sound.
Specifically, processing of delay and attenuation according to the distance from the window to
the head of the vehicle occupant is performed on the sound of the vehicle peripheral object, or
the sound of the vehicle peripheral object is transmitted from the window to the head of the
vehicle occupant Since the processing is performed by the transfer function of the sound
transmission system up to the part, the sound of the object around the vehicle is heard by the
vehicle occupant as if the sound from the object around the vehicle came naturally from the open
window. be able to.
[0060]
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According to one embodiment, in the second correction process, the output sound after the first
correction process is subjected to the process of removing the influence of the sound
transmission system from each speaker to the vehicle occupant. Even if the speakers are
arranged at a position different from the position, the vehicle occupant can be notified that the
sound of the object around the vehicle can be correctly heard from the direction in which the
object exists, and the degree of freedom of the microphone and the speaker with respect to the
vehicle Can be improved.
[0061]
According to one embodiment, the output sounds of the plurality of speakers are controlled so
that the sounds of the vehicle peripheral objects can be heard near the vehicle occupants' ears
and the vehicle occupants other than the vehicle driver can not hear the sounds of the vehicle
peripheral objects. Thus, it is possible to provide a quiet interior environment for the passengers
other than the driver while letting the driver hear the environmental sound outside of the vehicle
and take appropriate measures.
[0062]
According to one embodiment, the head position of the vehicle driver is detected, and the
contents of the first correction processing and the second correction processing are changed
according to the head position of the vehicle driver. Even if the head position of the vehicle
changes, the sounds of objects around the vehicle can be reproduced with high accuracy.
[0063]
The figure which shows the structure of one embodiment of the invention The figure which
explains the operation of the hearing monitor device when passing the toll gate of the highway
The flowchart which shows the operation of the hearing monitoring device when passing the toll
gate of the highway Flowchart showing the operation of the hearing monitor when changing
lanes Diagram explaining the operation of the device Flowchart showing the operation of the
hearing monitor when approaching an intersection A diagram explaining the operation of the
hearing monitor when entering the flow chart A flowchart showing an operation of the hearing
monitor when entering the service area A diagram explaining the operation of the hearing
monitor when leaving the road A diagram when leaving the road Flow chart showing the
operation of the hearing monitor The figure showing the operation of the hearing monitor when
it gets caught in traffic jam Flow chart showing the operation of the hearing monitor when it gets
caught in the diagram Explaining the operation of the hearing monitor when it gets close to the
level crossing Flow chart showing the operation of the hearing level when it gets close to the
level crossing Hearing monitor after engine start Flow chart showing the operation of the hearing
monitor after starting the engine Operation flowchart of the hearing monitor when the blinker or
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hazard switch is operated Operation of the hearing monitor when the blinker or hazard switch is
operated Figure showing the operation of the hearing monitor at the time of steering operation
Figure showing the operation of the hearing monitor at the time of steering operation Figure
showing the operation of the hearing monitor at the time of slowing Figure the hearing monitor
at the time of slowing Low speed running flowchart showing the operation of Diagram explaining
the operation of the hearing monitor when continuing for a predetermined time. Flow chart
showing the operation of the hearing monitor when slow running continues for a predetermined
time. Diagram explaining the operation of hearing monitor when running backward. Flow chart
showing the operation of the monitor device Description of the operation of the hearing monitor
device when entering a tunnel Diagram showing the operation of the hearing monitor device
when entering a tunnel The operation of the hearing monitor device when entering the school
zone or silver zone Flow chart showing the operation of the hearing monitor when entering the
school zone or silver zone Illustration of the operation of the hearing monitor when entering the
beach or forest road Figure of the hearing monitor when entering the beach or forest road Of the
sounds around the vehicle detected by the flowchart sound input unit showing the operation, The
flow chart which shows the procedure which suppresses the running sound of self-vehicles
among the sounds around the vehicle detected by the figure sound input part which explains the
method of suppressing running sound The block diagram which shows the basic composition of
another embodiment A diagram showing a specific configuration of an embodiment A diagram
showing an arrangement example of a microphone A diagram showing another arrangement
example of a microphone A diagram showing another arrangement example of a microphone A
diagram showing another configuration example of another embodiment Flow chart showing
operation of the other embodiment The diagram for explaining the concept of the configuration
of the first correction unit Diagram showing the configuration example of the first correction unit
Diagram showing the configuration example of the first correction unit filter First compensation
unit filter Figure showing another configuration example Diagram showing another arrangement
example of the microphone Diagram showing the concept of the configuration of the second
correction unit Diagram showing a configuration example of the reverse filter of the second
correction unit Others of the reverse filter of the second correction unit 15 shows an example of
the configuration of the inverse filter that simplifies the inverse filter shown in FIG. Diagram for
explaining a switching method of the second corrector inverse filter corresponding to FIG driver's
head position switching method will be described of the first corrector filter adapted to the FIG
driver's head position indicating the Luther structure
Explanation of sign
[0064]
10 sound input unit (sound collection unit) 30 first correction unit (first correction unit) 40
second correction unit (second correction unit) 50 sound output unit (reproduction unit) 111
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vehicle information detection unit (information detection unit) 112 Switch part (control means)
113 Filter part (control means) 114 Volume change part (control means) 210_1 to 210_n
Microphone (sound collection means) 230, 262 AD converter 240, 250 Arithmetic unit (control
means) 245, 255 Storage device 261, 270 DA converter 290_1 to 290_n Speaker (reproduction
means) 300 Head position detection device (position detection means)
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