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JP2009184480

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009184480
An object of the present invention is to provide a simple and inexpensive structure of a
microphone array device for a car, and a method of manufacturing the same. A microphone array
device for an automobile according to the present invention includes a rearview mirror including
a mirror portion and a mirror support portion movably supported on the mirror portion and
provided in the vehicle, and a mirror support without hiding behind the mirror portion. And a
second microphone provided on the mirror unit. The first microphone may be provided on the
mirror support via the microphone support. [Selected figure] Figure 4
Microphone array apparatus for automobile and method of manufacturing the same
[0001]
The present invention relates to a microphone array for inputting voice, and more particularly, to
a microphone array device for automobile for inputting voice of a vehicle driver and a method of
manufacturing the same.
[0002]
As a voice recognition device for a motor vehicle driver or a voice input means of a hands-free
telephone device, a microphone array using a plurality of microphones is expected to improve
noise resistance.
However, in order for the microphone array to operate as expected, it is premised that the
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direction of voice arrival can be accurately detected, and if the directivity of the microphone
array is directed to the direction of incorrect voice arrival, the sound quality is rather degraded.
There was a problem. In particular, in recent years, a specification that withstands extremely
severe use conditions such as high-speed traveling with an open window and high-speed
traveling of an open car is required, and measures are required.
[0003]
The simplest solution proposed conventionally is to place the microphone array 100 in front of
the driver as shown in FIG. Even when the sheet is shifted back and forth, the voice incoming
direction is always the front direction of the microphone array 100. The driver may shift his /
her body left and right at the time of stopping, but such a thing is considered to be small under
the conditions of high-speed traveling where measures are required. Of course, the microphone
array 100 has a function to detect the direction of voice arrival from the observation voice itself
and direct its directivity in any direction, and it operates stably when stopped or when the
window is closed. . Therefore, in a situation where there is little noise, tracking the direction of
voice arrival allows deviation of the utterance position, and in a situation under high noise where
tracking the direction of voice arrival is difficult, the direction of voice arrival is assumed to be
frontal. The microphone array 100 may operate. However, unfortunately, it is extremely difficult
to install the microphone array 100 on the front dashboard or the front sun visor for security
reasons in the event of a collision, so another measure is required.
[0004]
Patent Document 1 proposes incorporating a telephone into a rearview mirror in a car. Since the
rearview mirror is adjusted to be generally facing the driver, the microphone can be directed
substantially in the driver's direction, that is, in the direction of voice arrival, by embedding the
microphone therein. However, when a plurality of microphones are embedded and used as a high
resolution directional microphone array, the error alone is large. This is because, as shown in FIG.
2, between the inclination angle of the rearview mirror 200 adjusted to view the rear and the
inclination angle of the microphone array 100 installed to face the driver's mouth. The
relationship between the driver's seat viewed backward from the microphone array 100, that is,
the direction of the voice arrival, is exactly the same when the driver's seat is shifted backward
and forward. It is because it does not. That is, this method alone can not achieve the purpose of
directing the microphone array 100 in the direction of the driver, that is, the direction of voice
arrival with sufficient accuracy, and fix the front and rear slides of the driver's seat or position
information of the front and rear slides. Or need to notify the microphone array 100 of additional
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measures.
[0005]
Patent Document 2 proposes a mechanism for detecting the tilt angle formed by the rearview
mirror adjusted so as to look behind, and determining the directivity of the microphone array
based on the information. The microphone is assumed to be incorporated into the rearview
mirror, but in principle, it can also be fixed to the vehicle body and operate similarly. However,
this method requires a sensor for detecting the tilt angle of the rearview mirror, which leads to
an increase in cost.
[0006]
On the other hand, as shown in FIG. 3, the microphone array 100 is directed toward the driver's
mouth using only a purely mechanical mechanism consisting of a pair of inscribed gears 300
without using an angle sensor. A scheme is also considered. However, such a mechanism having
an extra moving part is not practical because it is fragile and the cost is also increased. U.S. Pat.
No. 5,940,503 Japanese Patent Application Laid-Open No. 2001-352595
[0007]
The prior art has the above problems. The present invention aims at the realization of
microphone array technology that solves such problems. SUMMARY OF THE INVENTION The
object of the present invention is to provide a simple and inexpensive structure of an automotive
microphone array apparatus and a method of manufacturing the same, which can safely be
directed to a motor vehicle driver and voice can be input.
[0008]
According to the present invention, the microphone array installed in the rearview mirror portion
is made to face in the direction of the driver's mouth without using the angle sensor and without
adding the movable portion. According to this configuration of the present invention, there is
provided a rearview mirror including a mirror portion and a mirror support portion movably
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supporting the mirror portion and provided in an automobile, and a first mirror support portion
without being hidden behind the mirror portion. The present invention is achieved by a
microphone array device for a motor vehicle, which includes a microphone of and a second
microphone provided at a mirror portion.
[0009]
Preferably, in the automotive microphone array device according to the present invention, the
first microphone is provided on the mirror support via the microphone support.
[0010]
Preferably, the first microphone is located between the center in the left-right direction of the
mirror portion and one end, and the second microphone is located at the one end in the left-right
direction.
[0011]
Furthermore, preferably, the first microphone is positioned at one end in the vertical direction of
the mirror portion, and the second microphone is positioned at one end in the vertical direction,
or the first microphone is positioned in the vertical direction of the mirror portion The second
microphone may be positioned at the center in the up and down direction.
[0012]
The invention also provides a method of manufacturing such a car microphone array device.
According to the manufacturing method of the present invention, there is provided a rearview
mirror including a mirror portion and a mirror support portion provided in an automobile
movably supporting the mirror portion, and providing a first microphone on the mirror support
portion. Providing the second microphone in the mirror unit.
In this manufacturing method, the distance from the fulcrum where the mirror support portion
supports the mirror to the first microphone in the lateral direction of the mirror is Y, the distance
from the same fulcrum to the second microphone in the lateral direction is W, the mirror The
offset distance of the first microphone in the longitudinal direction of the unit is d1 and the offset
distance of the second microphone in the longitudinal direction is d2, the distance from the same
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fulcrum to the driver's mouth in the lateral direction is D, and the tilt angle formed by the mirror
unit , The inclination angle of the line connecting the positions of the first and second
microphones as φ, and the inclination angle of the line connecting the positions of the first and
second microphones when facing the driver's mouth directly as Φ Determining values of Y, d1
and d2 for given values of W, D and θ so as to minimize the next evaluation function E, W, D and
Prepare the rearview mirror, install the first microphone on the mirror support portion, and
install the second microphone on the mirror portion so that θ becomes a predetermined value
and the values Y and d1 and d2 are obtained. Including.
[0013]
According to the present invention, a microphone array device for a vehicle, which is directed
safely to a vehicle driver and inputs voice, can be realized together with the manufacturing
method with a simple and inexpensive structure, and the problems of the prior art can be solved.
[0014]
Hereinafter, the best mode for carrying out the present invention will be described in detail
based on the drawings, but the following embodiments do not limit the invention according to
the claims, and are described in the embodiments. Not all combinations of features are essential
to the solution of the invention.
In addition, the same number is attached | subjected to the same element through the whole
description of embodiment.
Further, each element is shown by enlarging or reducing it as needed for explanation, and the
size of each element shown and the relation of sizes between those elements are not intended at
all.
[0015]
First, for the microphone array technology of the present invention, the "microphone array
orientation" refers to the normal direction of the line in which the plurality of microphones are
arranged, which relates to the directivity of the microphone array. In one pair of microphones,
the normal direction of a line connecting two microphones is the “microphone array
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orientation”.
[0016]
FIG. 4 is a top view showing a schematic configuration of a car microphone array apparatus 400
according to an embodiment of the present invention. As shown in FIG. 4, one first microphone
410 is provided and fixed in a position extending laterally from a mirror support 420 provided in
a rearview mirror automobile. To provide the first microphone 410 on the mirror support 420,
the microphone support 430 may be used. The microphone support 430 is provided to the
mirror support 420 at the position of the fulcrum 440 of the rearview mirror. The other second
microphone 450 is provided at the position of the edge of the horizontally long mirror portion
460 of the rearview mirror.
[0017]
When the mirror unit 460 is not tilted or directed rearward, the first microphone 410 is placed
laterally with the second microphone 450 at a midpoint between the position of the second
microphone 450 and the position of the fulcrum 440 of the rearview mirror. Located alongside.
By providing a pair of microphones in this manner and providing them in the rearview mirror,
the inclination angle φ formed by the line connecting the positions of the first and second
microphones 410 and 450 is greater than the inclination angle θ formed by the mirror portion
460. Will also grow. If the installation positions of the first and second microphones 410 and
450 are well adjusted, the first and second microphones 410 can be arranged regardless of the
inclination angle of the mirror unit 460 adjusted to view the rear. The line connecting the
positions 450 and 450 can face the driver's direction.
[0018]
The microphone array device 400 may proceed with the process as the front direction in which
the direction of voice arrival faces the driver. In FIG. 4, the mirror support 420 supports the
mirror 460 at the center in the lateral direction, that is, the lateral direction, but the mirror
support 420 may support the mirror 460 at a position deviated from the lateral center. In
particular, although the position of the fulcrum 440 of the rearview mirror is located at the
center of the mirror unit 460, it may be located off the center. In addition to the configuration as
shown in FIG. 4, as shown in the top view of FIG. 5, the first and second microphones 410 and
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450 may be installed on the side far from the driver's seat. As speech enhancement processing of
a microphone array, various methods such as “delay-sum beamformer” and “minimum
dispersion beamformer” exist. The present invention relates to the direction of speech arrival
and is not limited to the particular speech processing scheme of the microphone array.
[0019]
As shown in a top view and a front view in FIG. 6, when installing a pair of microphones in the
rearview mirror, first, the mirror portion 460 is directed to the rear and the installation positions
of the first and second microphones 410 and 450 are decide. The first microphone 410 is
provided on the microphone support 430 at a distance Y in the left-right direction of the mirror
460 from the fulcrum 440 of the rearview mirror. The second microphone 450 is provided at
one end of the mirror unit 460 located at a distance W in the left-right direction from the
fulcrum 440 of the rearview mirror. The second microphone 450 can be called a movable
microphone because it moves with the tilting movement of the mirror unit 460. The first and
second microphones 410 and 450 can be installed with offset values d1 and d2 in the front-rear
direction of the mirror unit 460, respectively.
[0020]
These Y, d1 and d2 values are designed such that the two first and second microphones 410 and
450 are better directed towards the driver's mouth. The design depends on the slide range of the
driver's seat and the position of the rearview mirror, so it may be determined in designing the
vehicle. In use, as shown in the top view of FIG. 7 where the tilt of the mirror unit 460 is small
and the top view of FIG. 8 where the tilt is large, adjusting the rearview mirror so that the driver
can see the rear, the slide position of the driver's seat Wherever, the line connecting the fixed
first microphone 410 and the movable second microphone 450 will automatically face the
driver's direction.
[0021]
The direction of the mirror unit 460 is adjusted not only in the lateral direction but also in the
vertical direction. As shown in the side view of FIG. 9, if the offset value, particularly the offset
value d2 of the second microphone 450 is changed by the adjustment of the vertical direction,
the expected effect can not be exhibited. . Therefore, it is desirable that the movable second
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microphone 450 be placed on the supporting point 440 in the vertical direction when the
rearview mirror is viewed from the side. For that purpose, as shown in a side view in FIG. 10, the
vertical support point 440 ′ is moved to the upper end of the mirror section 460. Or, if that is
difficult, as shown in the side view and the front view in FIG. 11, when the rearview mirror is
viewed from the side, the fulcrum 440 'in the vertical direction is at the center position, and the
movable second microphone The first microphone 410 fixed on its fulcrum 440 ′ and fixed is
positioned at the upper end of the mirror portion 460 above it. The vertical support point ‘is
usually the same as the horizontal support point 440, but may be different.
[0022]
The manufacture of a microphone array device for a motor vehicle according to the invention
will now be described. As described above, as design parameters of the microphone array device,
the distance in the lateral direction from the fulcrum 440 of the first microphone 410 to be fixed,
ie, the horizontal distance Y, the movable second provided at one end of the mirror portion 460
There are offset values d1 and d2 in the front-rear direction of the installation distance of the
first and second microphones 410 and 450, respectively. Usually, W is determined from the size
of the rearview mirror.
[0023]
The parameters Y, d1 and d2 are designed such that the line connecting the positions of the first
and second microphones 410 and 450 is directed as much as possible to the driver's mouth as
follows. The inclination angle φ formed by the line connecting the positions of the first and
second microphones 410 and 450 is calculated from W, θ, Y, d1 and d2 as follows.
[0024]
On the other hand, when the driver adjusts the rearview mirror to look at the rear, θ is given as
follows. As shown in FIG. 12, where D is the distance in the left-right direction from the position
of the fulcrum 440 of the rearview mirror to the driver's mouth, that is, the horizontal distance,
That is, it is a horizontal distance.
[0025]
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Here, it is assumed that a line connecting the positions of the first and second microphones 410
and 450 is determined so as to face the driver's mouth directly. Assuming that the inclination
angle formed at that time is Φ, it is obtained as follows. Φ is a target value of φ and can be
called a design target line. Design parameters Y, d1 and d2 are selected so that both are as close
as possible.
[0026]
That is, design parameters Y, d1 and d2 are selected so as to minimize the next evaluation
function E.
[0027]
Alternatively, the design parameters Y, d1 and d2 may be selected to minimize the next
evaluation function E.
[0028]
Here, as an example, the above-mentioned minimization problem was numerically solved under
the conditions of W = 120 mm, D = 300 mm, and θ = 15 degrees to 25 degrees.
However, the offset value was set to 5 mm or less.
Then, Y = 43.3 mm, d1 = 5 mm and d2 = 1.2 mm were obtained. The graph which plotted the
direction of direction of the microphone array (Example) which implemented this invention as
this optimal solution is shown in FIG.
[0029]
In the graph of FIG. 13, the horizontal axis is the tilt angle θ formed by the rearview mirror, and
the vertical axis is the tilt angle φ formed by the line connecting the positions of the first and
second microphones 410 and 450 (see FIG. 12). . For comparison, both microphones also show
the direction in which the microphone array (conventional example) installed in the mirror part
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(movable part) faces. In addition, the direction of the actual speaker (driver) is also shown.
[0030]
In the embodiment based on the optimum solution, it is understood that the direction of the
actual speaker (driver) can be well approximated in the design assumed range θ = 15 degrees to
25 degrees. The microphone array device according to the present invention using this design
point can always receive the incoming voice from the driver in the front direction. On the other
hand, in the conventional example, even if the offset is determined so as to minimize the error
around the middle position of the two microphones, when the driver's seat is shifted forward (θ>
20 degrees) or backward When (θ <20 degrees), a large angular error occurs in the direction of
the microphone array with the direction of the actual speaker (driver).
[0031]
Next, the relationship between the accuracy of the voice arrival direction of the microphone
array and the voice recognition rate is experimented and considered, and setting the voice
direction correctly is effective for improving the recognition rate of voice recognition using the
microphone array. To indicate that
[0032]
The experimental conditions are as follows.
・ Normal passenger car ・ High-speed traveling at over 100 km / h ・ Window opening 10 cm
・ Fixed 2 microphones near upper central room light Table 1 shows the word recognition rate
of the result. As shown in the leftmost row and the middle row of Table 1 in Table 1 above, under
severe conditions such as high-speed driving with an open window, even if the microphone array
is adopted, it is not effective alone. It can happen. This is because such severe conditions often
fail to detect the direction of voice arrival. However, as shown in the results in the rightmost
column of Table 1 above, if the direction of the voice arrival can be set accurately by some
method, the original performance of the microphone array can be exhibited.
[0033]
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In the present invention, since the microphone array can always be made to face the direction of
the driver's mouth (direction of voice arrival), the direction of the microphone array can be set in
the direction of voice arrival and wait. In addition, in an environment with little noise, the
performance of the microphone array itself, in particular, the function of detecting the direction
of voice arrival can be fully exhibited.
[0034]
As a microphone array device for a car according to the present invention, a configuration has
been shown in which a pair of microphones are arranged in the horizontal direction, and the
direction of incoming voice corresponds to the direction in the left-right direction. However, if
necessary, a pair of microphones may be arranged in the vertical direction to correspond to the
vertical direction as the direction of voice arrival.
[0035]
The present invention is configured to install two microphones, a fixed microphone and a
movable microphone. Although two microphones are used, the signal processing technology of
the microphone array is advanced, and a scheme with high voice enhancement capability is
emerging, which is sufficient for the performance of the microphone array. Also in the
manufacture of the microphone array device, since two microphones are used, the cost can be
reduced, including the hardware for analog to digital conversion. Therefore, according to the
present invention, an inexpensive microphone array device for a car can be manufactured.
[0036]
As mentioned above, although the present invention was explained using an embodiment, the
technical scope of the present invention is not limited to the range given in the above-mentioned
embodiment. It is possible to add various changes or improvements to the above-mentioned
embodiment, and the form which added such a change or improvement is naturally included in
the technical scope of the present invention.
[0037]
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It is the schematic which shows the conventional example of the microphone array for motor
vehicles. It is the schematic which shows the conventional example of the microphone array for
motor vehicles. It is a top view which shows the conventional example of the microphone array
for motor vehicles. It is a top view which shows schematic structure of the microphone array
apparatus 400 for motor vehicles which concerns on one Embodiment of this invention. It is a
top view which shows schematic structure of the microphone array apparatus 500 for other cars
which concerns on one Embodiment of this invention. It is the top view and front view which
show a schematic structure when it looks to the back front of the microphone array apparatus
400 for motor vehicles. FIG. 6 is a top view showing a schematic configuration when the
microphone array 400 for an automobile is slightly inclined in the left-right direction. It is a top
view which shows schematic structure when it inclines large in the left-right direction of the
microphone array apparatus 400 for motor vehicles. FIG. 6 is a side view showing a schematic
configuration when the microphone array device for automobile 400 is inclined in the vertical
direction. It is a side view which shows schematic structure when it inclines to the up-down
direction of the microphone array apparatus 600 for other cars which concerns on one
Embodiment of this invention. It is a side view and a front view showing a schematic structure
when it inclines in the up-and-down direction of other microphone array devices 700 for cars
concerning one embodiment of the present invention. It is the schematic which shows the
example of arrangement | positioning in the motor vehicle of the microphone array for motor
vehicles of this invention. 5 is a graph illustrating an example of optimization in the design of the
automotive microphone array of the present invention.
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 100 Microphone array 200 Room mirror 400, 500, 600, 700
Microphone array apparatus for motor vehicles 410 1st microphone 420 mirror support 430
Microphone support 440 fulcrum of room mirror 450 2nd microphone 460 mirror
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