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JP2006311202

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DESCRIPTION JP2006311202
An object of the present invention is to analyze acquired measurement data by simultaneously
collecting sound in a vehicle compartment by a plurality of microphones, and to determine the
installation position of the optimum microphone for each seat. An acoustic source generating a
plurality of different acoustic signals by changing a frequency in a vehicle interior having a
plurality of seats, installed at each of a plurality of positions in the vehicle interior, the acoustic
generated from the acoustic source A plurality of arrays in which sound pickup elements for
picking up signals are linearly fixed to a support member, a recording means for recording an
acoustic signal picked up by the array, and an acoustic signal recorded by the recording means
Storage means, and analysis means for analyzing an acoustic signal stored in the storage means.
[Selected figure] Figure 1
Acoustic measurement device
[0001]
The present invention relates to an acoustic measurement device.
[0002]
In recent years, car navigation has become widespread, and automobiles equipped with car
navigation have become common.
Further, in car navigation, in addition to manual operation functions such as remote control
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1
operation and touch panel operation, development of a hands-free operation function by voice
recognition has been conducted. Along with this, opportunities for installing hands-free
microphones in vehicles are increasing. Therefore, it is necessary to install the microphone at a
position where the user's voice can be reliably picked up in voice recognition of car navigation or
in a call with a hands-free microphone.
[0003]
Therefore, in order to determine the optimum microphone installation position, the sound of
various places is integrated by integrating the five microphones in a radial position with the
support member and changing the installation position of the support member. An acoustic
measurement device for measuring is disclosed (see Utility Model Document 1). Japanese Utility
Model Application Publication 6-33033
[0004]
However, in the conventional acoustic measurement apparatus, the number of microphones for
measurement is small, and in order to measure only one spot with one microphone, the
installation position of the microphone is determined by trial and error, and the measurement is
performed each time. Was. Therefore, the measurement can not be performed under the same
environment, and since the measured values are measured in an environment where noise
conditions are different, it is impossible to determine the optimum microphone installation
position using only the measured values. was there.
[0005]
An object of the present invention is to simultaneously acquire sound in a vehicle compartment
by a plurality of microphones, acquire measurement data under the same environment, and use
an acoustic measurement device that analyzes the acquired measurement data to each seat. It is
to enable the determination of the optimal microphone placement position.
[0006]
In order to solve the above-mentioned subject, the invention according to claim 1 equips a car
interior which has a plurality of seats with an acoustic source which changes a frequency and
generates a plurality of different acoustic signals, and a plurality of positions in the car interior A
plurality of arrays, each of which is disposed on each of the plurality of sound pickup elements
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2
for linearly collecting the sound pickup elements for picking up the sound signals generated from
the sound source, and recording means for recording sound signals picked up by the array And
storage means for storing an audio signal recorded by the recording means, and analysis means
for analyzing the audio signal stored in the storage means.
[0007]
The invention according to claim 2 is the acoustic measurement apparatus according to claim 1,
wherein the plurality of arrays simultaneously picks up acoustic signals generated from the
acoustic source, and the analysis means simultaneously picks up the acoustic signals. It is
characterized by analyzing an acoustic signal.
[0008]
The invention according to claim 3 is characterized in that in the sound measurement device
according to claim 1 or 2, the plurality of arrays are fixed at a plurality of positions in a vehicle
cabin.
[0009]
According to a fourth aspect of the present invention, an acoustic source is provided in a vehicle
compartment having a plurality of seats, the acoustic source generating a plurality of different
acoustic signals by changing the frequency, the acoustic source installed in the vehicle
compartment and generated from the acoustic source An array in which a sound pickup element
for picking up a signal is linearly fixed to a support member, a recording means for recording an
acoustic signal picked up by the array, and a storage for storing the acoustic signal recorded by
the recording means And means for analyzing the acoustic signal stored in the storage means.
[0010]
The invention according to claim 5 is characterized in that, in the acoustic measurement device
according to claim 4, one of the arrays is installed in the vehicle compartment and is movable in
the vehicle compartment.
[0011]
The invention according to claim 6 is characterized in that, in the acoustic measurement device
according to claim 4 or 5, a part of the support member constituting the array can expand and
contract in correspondence with the inner width of the vehicle. There is.
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[0012]
The invention according to claim 7 relates to the sound measurement apparatus according to
claim 6, wherein the support member is installed in a guide means for moving the vehicle
interior back and forth, and the guide means moves the support member up and down. It is
characterized in that it is installed in lifting means to
[0013]
The invention according to claim 8 is the acoustic measurement apparatus according to claim 6
or 7, wherein the support member is installed on guide means for moving the seat rows in the
vehicle room to the left and right, and the guide means is It is characterized in that it is installed
in an elevating means for moving the support member up and down.
[0014]
The invention according to claim 9 is the acoustic measurement device according to any one of
claims 1 to 7, wherein the acoustic signal analyzed by the analysis means is generated by the
acoustic source while the vehicle is traveling. It is characterized by being a signal.
[0015]
According to the present invention, a plurality of microphones are installed in a vehicle cabin,
and the installation positions of the microphones are moved to collect sound signals at the
plurality of positions, and by analyzing those data, a plurality of microphones are obtained under
the same environment. The sound signals can be measured by the microphones installed at the
positions, and it becomes possible to determine the installation position of the microphones
optimum for each seat.
[0016]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
In addition, the measurement by the sound measurement apparatus 100 of this embodiment
shall be performed in a vehicle interior while driving | running | working of a vehicle.
[0017]
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First Embodiment First, FIG. 1A shows an acoustic measurement device 100 according to a first
embodiment installed in a vehicle compartment.
As shown in the figure, seats 50R, 51R, 52R, 50L, 51L and 52L are installed in the vehicle cabin
in the traveling direction of the vehicle.
A seat 50R is installed in the first row on the right side, a seat 51R in the second row on the same
side, and a seat 52R in the third row on the same side in the traveling direction of the vehicle.
On the other hand, in the direction of travel of the car, a seat 50L is provided in the first row on
the left side, a seat 51L in the second row on the same side, and a seat 52L in the third row on
the same side.
Although the configuration of the seats in the vehicle compartment in the present embodiment is
six seats and three rows, it is not limited to this.
Of these seats, the seat 50R is a driver's seat, and the others are passenger seats.
[0018]
The sound measurement apparatus 100 includes a plurality of microphone arrays 11, 12, 13, 14,
15, 16, 17, 18 and a plurality of speakers 21, 22, 23, 24, 25, 26 that output sound, and the
speaker 21. Each of ~ 26 is installed one for each seat.
In the sound measurement apparatus 100 according to the first embodiment, eight microphone
arrays are used, which are fixed to a wall surface, a ceiling, or the like which can be installed in a
vehicle interior.
Specifically, the microphone arrays 11 and 12 are installed on the dashboard on the front side
(front glass side) of the vehicle, and the microphone arrays 13 and 14 are installed on the ceiling
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on the front side of the vehicle.
Further, the microphone arrays 15 and 16 are installed on the left wall in the traveling direction
of the car, and the microphone arrays 17 and 18 are installed on the right wall in the traveling
direction of the car.
In the present embodiment, since the main purpose is to collect voices emitted by the driver and
the passenger, it is assumed that the microphone arrays 11 to 18 are installed only in front of
the driver and the passenger. However, the present invention is not limited to this, and a
microphone array may be further installed at the rear.
[0019]
Next, FIG. 1 (b) shows an enlarged view of the microphone array 11.
As shown in FIG. 1, the microphone array 11 includes a plurality of microphones 11-1, 11-2, 113, 11-4, 11-5, 11-6, 11-7, 11-8 on the support member 10. In a straight line at regular intervals.
In the first embodiment, a nondirectional microphone is used as the microphone, but it may be a
microphone having appropriate directivity. Alternatively, both non-directional microphones and
directional microphones may be installed on the support member 10 constituting the
microphone arrays 11 to 18, and sound signals may be collected by two types of microphones by
switching operation. The microphone arrays 12 to 18 also have the same configuration, and thus
the description and illustration thereof will be omitted.
[0020]
FIG. 2 shows the main configuration of the sound measurement apparatus 100 according to the
first embodiment. As shown in the figure, the sound measurement apparatus 100 according to
the first embodiment includes a microphone amplifier 1, a multitrack recorder 2, a personal
computer (PC, hereinafter) 3, and a speaker amplifier in addition to the respective devices shown
in FIG. 4 and the changeover switch 5 etc. In addition, since the microphone array 11 is the
structure illustrated in FIG.1 (b), illustration is abbreviate | omitted. The same applies to the
microphone arrays 12-18.
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[0021]
The PC 3 outputs a sine wave frequency in the range of 20 Hz to 20 kHz, which is the human
audio frequency, to the speaker amplifier 4. The speaker amplifier 4 is an amplifier that amplifies
the input signal to a volume that can be heard by humans. When the signal input from the PC 3
is amplified by the speaker amplifier 4, the selector switch 5 selects one of the speakers 21 to 26
which is to output an acoustic signal. Then, an acoustic signal is output from the selected
speaker. In the first embodiment, this speaker is an acoustic source that generates an acoustic
signal. Hereinafter, an acoustic signal output from the speaker is referred to as a sound. Speaker
selection is performed to determine the optimum microphone installation position in each of the
seats 50R-52R, 50L-52L. For example, by outputting sound from the speaker 21 installed in the
seat 50R and simultaneously measuring it with the microphones provided in the microphone
arrays 11 to 18, a plurality of vehicle interiors can be obtained while the surrounding
environment is the same during traveling of the vehicle. I can measure the sound of the place.
Then, as a result, it can be confirmed at which position the microphone can most often collect
sound, and the optimum position of the microphone in the seat 50R can be determined. In the
sound measurement apparatus 100 according to the first embodiment, each of the microphone
arrays 11 to 18 includes eight microphones, so that eight microphones can perform
measurement simultaneously.
[0022]
When sound is output from the selected one of the speakers 21 to 26, measurement is started by
the microphones provided to the microphone arrays 11 to 18 installed in the vehicle
compartment. For example, when measurement is started by the microphone array 11, the
microphone array 11 converts air vibration due to the sound output from the speaker into
mechanical vibration and further converts the converted mechanical signal into an electrical
signal. Then, the electric signal is output to the microphone amplifier 1. Therefore, the sounds
outputted from the speakers 21 to 26 correspond to the voices of the people who board the
respective seats 50R to 52R and 50L to 52L. The same applies to the microphone arrays 12-18.
[0023]
The microphone amplifier 1 outputs the measurement data to the multitrack recorder 2 by
amplifying the electric signal from each microphone. The microphone amplifier 1 can adjust
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sensitivity by adjusting the amplification factor of the electric signal from each microphone.
[0024]
The multitrack recorder 2 is an apparatus most suitable for multiple recording, and can record
actual sounds on multiple channels. Therefore, a plurality of sounds amplified by the microphone
amplifier 1 are simultaneously multi-channel recorded, and their measurement data are output to
the PC 3. The multi-track recorder 2 used in the first embodiment has eight channels and can
therefore be measured simultaneously by the microarrays 11-18, but is not limited thereto, and
uses a multi-track recorder that measures simultaneously by more microphones You may. In
addition, since the multitrack recorder 2 can reproduce the recorded sound, it can check whether
it is recorded or not by reproducing it after the measurement.
[0025]
The PC 3 includes BD (database) storage means such as an HDD (hard disk) (not shown). When
the measurement data is input from the multitrack recorder 2, the PC 3 stores the measurement
data in the BD storage means. The PC 3 stores programs such as analysis software in the DB
storage means. Then, using the program, the measurement data at each position of the
microphone is analyzed (for example, FTT analysis (fast Fourier transform)), and the result is
displayed on a display screen or the like as a sound pressure distribution chart (see FIG. 3). When
displaying the measurement result, the PC 3 outputs the sine wave frequency again and repeats
the same process. Therefore, when the sound is output from the speaker 21 installed in the seat
50R and the measurement by the microphone arrays 11 to 18 is finished, the next operation is to
output the sound from the speaker 22 installed in the seat 50L and perform the same
measurement. . In this manner, the sound is output from the speakers 21 to 26 installed in the
seats 50R to 52R and 50L to 52L, and the microphones of various positions are collected to
determine the optimum installation position of the microphones. .
[0026]
Next, FIGS. 3A and 3B show an example of a sound pressure distribution map generated by the
PC 3. In addition, these sound pressure distribution charts show the measurement results within
a frequency range of 100 Hz to 5 kHz, and the sound is output from the speaker 21 installed in
the seat 50R. FIG. 3 (a) is a sound pressure distribution characteristic diagram when the
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microphone array 11 is installed at a position of 70 cm in front of the speaker 21 (front glass
side), and FIG. 3 (b) is a microphone array on the ceiling on the front glass side. It is a sound
pressure distribution characteristic figure at the time of installing 11. FIG. Both are graphs
showing the sound pressure at each frequency, and the horizontal axis is each microphone NO.
That is, for example, when the measurement is performed by the microphone array 11, the
microphone NO. 1 corresponds to the microphone 11-1. The vertical axis represents the sound
pressure value (dB). The comparison of the sound pressure value of each microphone at each
frequency is performed centering on the frequency range of 500 Hz to 3 kHz which is the
frequency of human voice, and the average reaching location in this range, that is, the large
sound pressure value is measured Is the optimal microphone installation position.
[0027]
In the sound pressure distribution diagram of FIG. 3A, first, the sound pressure values measured
by the respective microphones when the frequency of 500 Hz to 3 kHz, which is the frequency of
human voice, is output from the speaker 21 are compared. When the sound pressure value of
each microphone is compared at a frequency of 700 Hz, the microphone NO. 6 and NO. It can be
confirmed at 7 that the sound pressure value drops sharply. This cause is the influence of the
steering wheel of the driver's seat 50R. 6 and NO. The position of 7 can be said to be
disadvantageous for speech recognition. Therefore, microphone NO. 3, NO. 5, NO. It can be
confirmed that the position of 8 is the optimum installation position at the frequency of 700 Hz.
[0028]
Next, microphone NO. 3, NO. 5, NO. The sound pressure values at frequencies 500 Hz, 1 kHz, and
3 kHz are compared with respect to No. 8. In the case of the frequency 500 Hz, the microphone
NO. It can be confirmed that the position 3 is smaller in sound pressure value than the other two
places. Microphone No. 5 and NO. When sound pressure values of 8 are compared mainly at the
frequency of human voice, microphone NO. It can be said that the position 5 is an average sound
pressure value. Therefore, when the microphone array 11 is installed at a position of 70 cm in
front of the speaker 21 (front glass side) and sound is output from the speaker 21 installed in the
driver's seat 50R, the microphone NO. It can be confirmed that the position of 5 (11-5) is the
optimum installation position. That is, the sound pressure distribution chart can determine the
optimum installation position of the microphone installed in the driver's seat 50R.
[0029]
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9
Similarly, in the sound pressure distribution diagram of FIG. 3B, the sound pressure values
measured by the respective microphones when the frequency of 500 Hz to 3 kHz, which is the
frequency of the human voice, is output from the PC 3 are compared. First, sound pressure
values at frequencies 500 Hz, 1 kHz, and 3 kHz are compared. It can be confirmed that 7
measures the largest sound pressure value. Even at other frequencies, since good values are
measured on average, when the microphone array is set to the ceiling on the front side and
sound is output from the speaker 21 installed in the driver's seat 50R, Microphone No. It can be
confirmed that the position of 7 is the optimum microphone installation position. That is, the
sound pressure distribution chart can determine the optimum installation position of the
microphone installed in the driver's seat 50R.
[0030]
As described above, a plurality of microphone arrays configured by a plurality of microphones
are installed on the windshield glass side dashboard and ceiling, left side wall, and right side wall
in the vehicle interior, and sound is output from each seat to be used by the plurality of
microphones. By making measurements, it is possible to pick up sound simultaneously under the
same environment while the car is traveling, and by determining a plurality of measurement data,
it is possible to determine the optimum microphone installation position at each seat. Can. Also,
by creating a sound pressure distribution map from the measurement data, it is possible to
compare the sound pressure values of the microphones for each frequency, and it is possible to
accurately determine the optimum microphone installation position. Therefore, by installing a
microphone for voice recognition of car navigation, for example, at a position determined by
these measurement data, it is possible to improve voice recognition rate and perform voice
operation comfortably. Furthermore, by performing the operation by voice recognition, it is
possible to realize the avoidance of the accident due to the car navigation operation while
driving.
[0031]
The sound pressure distribution map is not limited to this, and, for example, a plurality of
distributions in the transverse direction of the vehicle body are displayed for each predetermined
vehicle height position, and the same effect can be obtained as color display in association with
each sound pressure value. Can be obtained (see FIG. 7).
[0032]
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10
Second Embodiment FIG. 4 shows a sound measurement apparatus 100 according to a second
embodiment installed in a vehicle compartment.
As shown in the figure, in the sound measurement apparatus 100 according to the second
embodiment, only one microphone array 30 is used, and eight microphones 30 are the same as
in the first embodiment. , 32, 33, 34, 35, 36, 37, 38 by mounting the support member 10 at
regular intervals. The microphone to be used is not limited to the nondirectional microphone, and
may be configured to use a microphone having appropriate directivity. Alternatively, both the
nondirectional microphone and the directional microphone may be installed on the support
member 10, and the two types of microphones may pick up the sound by switching operation.
[0033]
The passenger compartment has a configuration similar to that of the first embodiment, and
seats 50R, 51R, 52R, 50L, 51L, and 52L are installed in the traveling direction of the vehicle.
Moreover, the speakers 21, 22, 23, 24, 25, 26 are installed in each of the seats 50R to 52R and
50L to 52L as in the first embodiment. Furthermore, a guide for moving the microphone array
30 in the front-rear direction 40a of the vehicle compartment between the right seats 50R to
52R toward the traveling direction of the car and the left seats 50L to 52L toward the traveling
direction of the car The rail 41 is installed as a means. The rail 41 is fixed by a linear stage 42 as
an elevating means capable of expanding and contracting in the vehicle interior in the vertical
direction 40b.
[0034]
The support member 10 constituting the microphone array 30 is installed on the abovedescribed rail 41, and the vehicle interior is moved in the front-rear direction 40a to threedimensionally measure the sound field in space. Further, the microphone array 30 needs to
change the length of the microphone array 30 in accordance with the width of the interior of the
vehicle in order to move the vehicle interior in the front-rear direction 40a. Therefore, both ends
in the longitudinal direction of the support member 10 of the microphone array 30, that is,
between the microphones 31-32 and between the microphones 37 and 38 are configured to
expand and contract in the left-right direction (30a, 30b). A rail 41 on which the support member
10 of the microphone array 30 is installed is fixed to a linear stage 42 which can extend and
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contract in the vertical direction 40b. Therefore, it is possible to move the microphone array 30
installed on the rail 41 up and down by extending and retracting the linear stage 42 and moving
the rail 41 up and down in the vertical direction 40b. For example, by moving the microphone
array 30 between the first row and the second row of seats and further moving it up and down at
that position, the sound field in the space in front of the people boarding the seats 51R and 51L
is three-dimensionally To measure. This measurement is similarly performed in the front space of
the seats 50R and 50L and the front space of the seats 52R and 52L, respectively.
[0035]
In addition, wiring of the microphones 31 to 38 is laid on the rail 41, and the measuring device is
installed below the seats 51R and 51L in the second row (not shown). It is not limited to this.
Further, the installation positions of the speakers 21 to 26 and other settings are the same as
those in the first embodiment.
[0036]
Hereinafter, it is assumed that the direction in which the microphone array 30 is moved back and
forth 40a is the Y-axis direction, the direction in which the rails 41 are moved up and down 40b
is the Z-axis direction, and these are set by the stage controller 6 (described later). The expansion
and contraction directions 30a and 30b at both ends of the microphone array 30 are taken as the
X-axis direction, and are set by the wall fixing rod 7 (described later).
[0037]
FIG. 5 shows the main part configuration of the sound measurement apparatus 100 according to
the second embodiment. In addition to the devices shown in FIG. 4, the sound measuring device
100 includes a microphone amplifier 1, a multitrack recorder 2, a personal computer 3, a
speaker amplifier 4, a changeover switch 5, a stage controller 6, an X axis wall surface fixing rod
7, Y It comprises an axis linear stage 8, a Z axis linear stage 9, and the like. The microphone
amplifier 1, the multitrack recorder 2, the personal computer (PC) 3, the speaker amplifier 4, and
the changeover switch 5 are the same as in the first embodiment, and thus detailed description
will be omitted.
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[0038]
First, an instruction signal of the installation position of the microphone array 30 is input from
the PC 3 by the measurer. Specifically, the seat position to be measured, the spatial position in
the space corresponding to the position, and the installation positions of the microphones 31 and
38 corresponding to the vehicle width are set. When these signals are input to the stage
controller 6, the stage controller 6 operates the X-axis wall fixed rod 7, the Y-axis linear stage 8,
and the Z-axis linear stage 9 based on the input signals. First, to set the seat position to be
measured, the Y-axis linear stage 8 is operated, and the microphone array 30 is moved in the
front-rear direction 40a to be installed at the designated seat position. The setting of the spatial
position moves the microphone array 30 to the designated spatial position by operating the Zaxis linear stage 9 and expanding and contracting the linear stage 42 in the vertical direction
(40b). Setting the installation positions of the microphones 31 and 38 corresponding to the
vehicle width operates the X-axis wall fixed rods 7 to extend and contract the microphones 3132 and 37-38 of the microphone array 30 in the left-right direction 30a and 30b. Is moved to a
position corresponding to the specified in-vehicle width.
[0039]
When the microphone array 30 is set at the designated position by the above-described
operation, the stage controller 6 inputs a signal to the effect that the position movement is
completed to the PC 3. When the PC 3 receives the position movement end signal from the stage
controller 6, the PC 3 outputs the set sine wave frequency to the speaker amplifier 4. The sine
wave frequency output at this time is set within the range of 20 Hz to 20 kHz, which is the
human audio frequency, as in the first embodiment.
[0040]
When the sine wave frequency is input from the PC 3, the speaker amplifier 4 amplifies those
signals. When the signal from the PC 3 is amplified by the speaker amplifier 4, the selector
switch 5 selects a speaker to be output from the speakers 21 to 26. In the case of the second
embodiment, since the installation position of the microphone array 30 is set in advance, a
speaker near that position is selected and a sound is output. The sound output from each of the
speakers 21 to 26 may be measured at one set position.
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[0041]
When sound is output from the selected one of the speakers 21 to 26, the measurement is
started by the microphones 31 to 38 of the microphone array 30 installed in the vehicle
compartment. The microphones 31 to 38 convert air vibration into mechanical vibration by the
sound output from the speaker, and further convert the converted mechanical signal into an
electric signal. Then, the electric signal is output to the microphone amplifier 1.
[0042]
The microphone amplifier 1 outputs the measurement data to the multitrack recorder 2 by
amplifying the input electric signal. When the measurement data is input, the multitrack recorder
2 outputs the measurement data to the PC 3. The PC 3 has the same configuration as that of the
first embodiment, and stores the input measurement data in the BD storage unit. Further, the PC
3 executes FTT analysis (fast Fourier transform) on measurement data at each position of the
microphone, and displays the result as a sound pressure distribution chart on a display screen or
the like. When displaying the measurement result, the PC 3 stops the process until an input
signal from the measurer is input. The measurer starts the measurement again by determining
the next installation position of the microphone array 30. When only the frequency is changed
with the microphone array 30 installed at the same position, a new sine wave frequency is output
from the PC 3 and the measurement is started.
[0043]
The result of the FTT analysis is not limited to the sound pressure distribution chart shown in
FIG. 3, and the sound pressure distribution may be displayed in gray scale. This gray scale
display may be monochrome or color, and when it is displayed in color, the sound pressure
distribution can be displayed more visually intelligibly. FIG. 7 shows an example of a sound
pressure distribution map by gray scale display.
[0044]
FIG. 7 is a sound pressure distribution chart in which a plurality of distributions in the transverse
direction of the vehicle body are displayed for each predetermined vehicle height position, and
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are displayed in gray scale in association with each sound pressure value. Further, it is a sound
pressure distribution when sound is output from the speaker 21 installed in the seat 50R, and
the darker the color, the larger the sound pressure value. In the figure, the darkest area is
indicated as E, and the lightest area is indicated as F. In the second embodiment, a sound
pressure distribution map of up to 60 cm is displayed at every height of 0 cm to 10 cm, but the
present invention is not limited thereto. The sound pressure distribution shown in the figure
shows measurement data in the space from the seats 50R, 50L to the windshield. Accordingly, 0
to 50 in the figure indicate the distances from the seats 50R and 50L to the windshield, and 1 to
8 indicate the microphones NO. Therefore, the position of A is the right rear in the traveling
direction of the vehicle, that is, the position of the driver's seat 50R. The position B is on the right
front side in the traveling direction of the car, and is the position closest to the windshield in
front of the driver's seat 50R. The position of C is the left front in the traveling direction of the
car, and the position of D is the left rear, that is, the position of the seat 50L.
[0045]
When sound is output from the speaker 21, as shown in the figure, the space in the vehicle
height of 20 cm to 30 cm has a wide range of the area E indicating the largest sound pressure
value, so the position of the vehicle height of 20 cm to 30 cm is in space Also in the above, it can
be seen that the largest sound pressure value is measured. Therefore, the installation position of
the best microphone can be determined based on the sound pressure distribution map by the
gray scale display. Furthermore, unlike the sound pressure distribution map shown in FIG. 3, by
displaying the sound pressure values in shades of color, it is possible to compare the sound
pressure values at each location in an easy-to-understand manner visually, and further display in
the area. By doing this, it is possible to easily determine the optimum microphone installation
position. Similarly, sound is output from the speakers 21 to 26 installed in each of the seats 50R
to 52R, 50L to 52L, and the measurement data is displayed as a sound pressure distribution map
by color density, and based on that, the sound of each place is By comparing the pressure values,
it is possible to determine the optimum installation position of the microphone for each seat.
[0046]
As described above, by measuring the sound by moving the microphone array constituted by the
plurality of microphones over a wide range in the vehicle compartment, the sound of the space is
simultaneously measured by the plurality of microphones in three dimensions. It is possible. This
makes it possible to acquire detailed measurement data measured under the same conditions
under the same environment, and to determine a more optimal microphone installation position
01-05-2019
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at each seat based on those measurement data. It is possible. In addition, since it is possible to
acquire detailed measurement data, it is possible to extract the position with the most noise and
the like, and it is also possible to specify the position where the installation of the microphone
should be avoided.
[0047]
Furthermore, by displaying the sound pressure distribution map in each space using gray scale
display, the sound pressure value of each place can be compared visually and easily, and the
installation position of the microphone in each seat can be quickly determined. It can be decided,
and improvement of work efficiency can be expected.
[0048]
Although one microphone array 30 is used in the second embodiment, the present invention is
not limited to this, and the same effect can be obtained even when the microphone array 30 is
installed on a plurality of rails 41.
[0049]
Modification of Second Embodiment Next, FIG. 6 shows an acoustic measurement device 100
according to a modification of the second embodiment installed in a vehicle compartment.
The seats 50R to 52R and 50L to 52L installed in the vehicle compartment and the speakers 21
to 26 have the same configuration as that of the second embodiment, and thus the description
thereof will be omitted.
[0050]
As shown in the figure, in the acoustic measurement apparatus 100 according to the
modification of the second embodiment, the microphone array 60 used is the I-type support
member 10 and the microphones 61, 62, 63, 64, 65, 66, 67, It comprises 68.
Four microphones 61, 62, 63, 64 are linearly installed at regular intervals in the first stage of the
I-shaped support member 10, and similarly, four microphones 65, 66, 67, in the second stage.
01-05-2019
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Install 68 straightly at regular intervals. A rail 43 is provided as a guiding means for moving the
microphone array 60 in the direction of travel of the vehicle between the first row seat 50R and
the seat 50L and the second row seat 51R and the seat 51L. Install Similar to the rail 41 of the
second embodiment, the rail 43 is fixed by a linear stage 44 which is an axis having an elevating
means capable of expanding and contracting the passenger compartment in the vertical direction
70b.
[0051]
The support member 10 constituting the microphone array 60 is installed on the abovedescribed rail 43, and the space between the first row seat and the second row seat in the vehicle
room is moved not only in the horizontal direction 70a but also in the vertical direction 70b.
Measure the sound at the same time in three dimensions. In addition, this rail 43 obtains detailed
measurement data in the forward space of the passenger by similarly installing and measuring
between the second row and the third row of seats, and also between the first row and the
dashboard. . Further, it is assumed that the direction in which the microphone array 60 is moved
to the left and right 70 a is the Y axis direction, and the direction in which the rails 43 are moved
to the upper and lower portions 70 b is the Z axis direction.
[0052]
The main part configuration of the acoustic measurement device 100 according to the
modification of the second embodiment is the configuration excluding the X-axis wall fixing rod 7
of the second embodiment, and the other configuration and operation are the second
embodiment. The description and the illustration are omitted because
[0053]
As described above, by using the I-type support member and using the microphone array in
which the plurality of microphones are divided into two stages, the sound in the space on the
front side of the seat can be three-dimensional simultaneously with the plurality of microphones.
Not only can it be measured, it is possible to measure a wide range of sounds simultaneously.
Furthermore, by moving the microphone array up and down, and to the left and right for
measurement, more detailed measurement data measured under the same conditions under the
same environment can be obtained, and based on those measurement data It is possible to easily
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find out the optimum microphone installation position for each seat. In addition, by moving the
vehicle compartment to the left and right, it is possible to measure the sound on both sides in
detail, and it is possible to acquire detailed measurement data of noise generated from a car
while traveling. This makes it possible to determine the optimum microphone installation
position from the measured value of the sound output from the speaker and the measured value
of the noise generated from the car. Therefore, it is possible to avoid the problem of picking up
both sound and noise, and it is possible to further improve the speech recognition rate, for
example, in car navigation. In addition, in the hands-free communication of the mobile phone, it
is possible to avoid picking up the noise together with the voice, so that clear voice can be
provided to the other party.
[0054]
BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the acoustic
measuring device which concerns on 1st Embodiment installed in the vehicle interior. It is a
figure which shows the principal part structure of the sound measurement apparatus which
concerns on 1st Embodiment. It is a sound pressure distribution figure which shows the data
measured with the sound measuring device of a 1st embodiment. It is a schematic block diagram
of the sound measuring device concerning a 2nd embodiment installed in the vehicle interior. It
is a figure which shows the principal part structure of the sound measurement apparatus which
concerns on 2nd Embodiment. It is a schematic block diagram of the sound measuring device
concerning the modification of a 2nd embodiment installed in the vehicle interior. It is a sound
pressure distribution figure by the gradation display which shows the data measured with the
sound measurement apparatus of 2nd Embodiment.
Explanation of sign
[0055]
Reference Signs List 1 microphone amplifier 2 multitrack recorder 3 personal computer 4
amplifier for speaker 5 selector switch 6 stage controller 7 X axis wall fixed rod 8 Y axis linear
stage 9 Z axis linear stage 10 support members 11, 12, 13, 14, 15, 16 , 17, 18, 30, 60
Microphone Arrays 21, 22, 23, 24, 25, 26, 27, 28 Speakers 31, 32, 33, 34, 35, 36, 37, 38
Microphones 41, 43 Rails 42, 44 Linear Stage 50R Seat (Driving Seat) 51R, 52R, 50L, 51L, 52L
Seat (Occupant Seat) 61, 62, 63, 64, 65, 66, 67, 68 Microphone 100 Sound Measurement Device
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