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DESCRIPTION JP2012129873

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DESCRIPTION JP2012129873
PROBLEM TO BE SOLVED: To reproduce a propagation sound from a designated area using a
sound source data measured at a predetermined observation point easily in a short time. A sound
source direction and a magnitude of a sound pressure signal are determined for each frequency
on a map in which a horizontal axis θ and an elevation angle φ viewed from an observation
point are coordinate axes using sound source data obtained using a sound source estimation
device. After creating the displayed sound source map, the sound source map is divided into a
plurality of space regions G, and the band power value p (F) is calculated from the magnitude of
the sound pressure signal for each frequency of each space region G. The power ratio R (F),
which is the ratio of power values, is determined, and the power ratio R (F) and the magnitude of
the sound of the band pass per octave band obtained through the sound pressure signal to the
octave band pass filter To correct the band power value p (F), and the corrected band power
value P (F) is used to reproduce the sound pressure waveform of the sound propagated from the
designated region G. [Selected figure] Figure 9
Method and apparatus for reproducing propagation sound from designated area
[0001]
The present invention relates to a method and apparatus for reproducing sound propagated from
a designated area using sound source direction data estimated using sound information collected
by a plurality of microphones and data of a sound pressure signal. It is a thing.
[0002]
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Conventionally, as a method of estimating the direction of arrival of sound, a microphone array in
which a large number of microphones are arranged at equal intervals is constructed, and the
sound source direction which is the direction of arrival of sound waves is estimated from the
phase difference of each microphone with respect to the reference microphone. So-called
acoustic methods have been devised (see, for example, Non-Patent Document 1).
On the other hand, a plurality of microphones constitute a plurality of microphone pairs
arranged in a straight line crossing each other, and an arrival time difference corresponding to a
phase difference between two microphones serving as a pair and an arrival between two
microphones serving as another pair Methods have been proposed for estimating the sound
source direction from the ratio to the time difference (see, for example, Patent Documents 1 to
3).
[0003]
Specifically, as shown in FIG. 12, two microphone pairs (M1, M3) and a microphone pair (four
microphones M1 to M4 are arranged at predetermined intervals on two straight lines orthogonal
to each other). M2 and M4) are arranged, and the arrival time difference D13 of the sound
pressure signal input to the microphones M1 and M3 constituting one microphone pair (M1 and
M3) and the other microphone pair (M2 and M4) The horizontal angle θ between the
measurement point and the position of the sound source is estimated from the ratio to the arrival
time difference D24 of the sound pressure signal input to the microphones M2 and M4. Also, the
fifth microphone M5 is disposed at a position not on the plane made by the microphones M1 to
M4, and four microphone pairs (M5, M1), (M5, M2), (M5, M3), (M5, M4) are provided. ), And the
measurement points from the arrival time differences D13 and D24 between the microphones
constituting the two microphone pairs and the arrival time differences D5j (j = 1 to 4) between
the microphones constituting the four microphone pairs The elevation angle φ between the
position of the sound source and the position of the sound source is estimated. The sound source
direction measured from the measurement point can be expressed by the estimated horizontal
angle θ and elevation angle φ. The sound source direction is determined for each frequency.
[0004]
As a result, the sound source direction can be accurately estimated with a smaller number of
microphones as compared to the case where the sound source direction is estimated using the
microphone array. In addition, an image pickup means such as a CCD camera is provided to take
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an image of the estimated sound source direction, and the image data of the image and the data
of the sound source direction are synthesized to estimate the sound source direction and sound
pressure level in the image. The sound source can be identified from the display screen by
displaying an image for sound source estimation on the display screen such as a display. FIG. 13
is a view showing an example in which the sound source direction estimation image is displayed
on the display screen 37D. The horizontal axis is the horizontal angle θ of the sound source, and
the vertical axis is the elevation angle φ of the sound source. At the centers of the sound sources
G1 to G3 respectively, the centers of the meshed circles and hatched circles are the central
positions of the sound sources G1 to G3, and the framed sound sources G1 and G2 are direct
sound sources and G3 is a reflected sound source. Thereby, the sound source can be visually
grasped. Also, the size of the circle represents the magnitude of the sound pressure signal.
Although the frequency is distinguished by the circle C in FIG. 13, the display screen 37D may be
a color screen and the frequency may be distinguished by color.
[0005]
JP 2002-181913 A JP JP 2006-324895 A JP JP 2008-224259 A
[0006]
Jiro Oga, Yoshio Yamazaki, Yutaka Kanada; Acoustic System and Digital Processing,
Corona,1995
[0007]
However, in the above-mentioned conventional method, although it is possible to visually grasp
the sound source for each frequency or reproduce the sound from a specific sound source for
each frequency, it includes a plurality of frequencies propagated from the designated area. It was
difficult to reproduce the sound easily and in a short time.
[0008]
The present invention has been made in view of the conventional problems, and a method
capable of easily reproducing propagation sound from a designated area using sound source data
measured at a predetermined observation point in a short time It aims at providing the device.
[0009]
The invention according to claim 1 of the present application is an area specified using sound
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source data including data of the sound source direction of one or more sound sources measured
at a predetermined observation point and data of the magnitude of a sound pressure signal. Data
reproducing means for reproducing the sound pressure waveform of the sound propagated from
the data storage means for storing the measured sound source data, data of the horizontal angle
of the sound source stored in the data storage means and data of the elevation angle Map
creation means for creating a sound source map in which the direction of the sound source and
the magnitude of the sound pressure signal are displayed for each frequency on the map with the
horizontal angle and the elevation angle as coordinate axes using A map division means for
dividing the sound source map into a plurality of spatial regions, and a band power value which
is a magnitude of the sound pressure signal for each octave band from the magnitude of the
sound pressure signal for each frequency of each spatial region A sound source data stored in
the data storage means, comprising band power value calculation means, band power ratio
calculation means for obtaining a power ratio which is a ratio of the band power value for each
octave band calculated, and an octave band pass filter A band waveform extraction unit for
extracting a band waveform which is a sound pressure waveform for each octave band, and the
band power calculated using the size of the extracted band waveform and the calculated power
ratio A sound of sound propagated from a designated area which is a designated space area of
the plurality of space areas using band power value correction means for correcting the value for
each octave band and the corrected band power value. And sound pressure waveform
reproducing means for reproducing a pressure waveform.
Thereby, the sound pressure waveform of the sound propagated from the designated area can be
reproduced easily and in a short time.
Also, if a plurality of designated areas are used, sound pressure waveforms of sounds from a
plurality of spatial areas having a loud sound or a characteristic frequency can be reproduced.
[0010]
The invention according to claim 2 is the apparatus for reproducing propagation sound from a
designated area according to claim 1, wherein the sound pressure waveform reproduced by the
sound pressure waveform reproducing means is input and propagated from the designated area.
A propagation sound reproducing means for outputting sound is provided.
Thus, not only the sound pressure waveform of the propagating sound but also the propagating
sound itself can be reproduced, so that the characteristics of the sound propagating from the
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designated area can be surely grasped.
The invention according to claim 3 is the apparatus for reproducing propagation sound from a
designated area according to claim 1 or 2, wherein the data storage means stores image data of
an image of a sound source direction photographed from the observation point. In addition,
display means is provided for displaying the image data in a space area including at least the
designated area of the display screen divided into a plurality of space areas similar to the sound
source map. As a result, since it is possible to visually grasp the sound source of the designated
area, it is possible to grasp which sound source is transmitted from which sound source.
[0011]
The invention according to claim 4 is the apparatus for reproducing propagation sound from a
designated area according to any one of claims 1 to 3, wherein the sound source data is
predetermined on two straight lines crossing each other. A phase difference between the
microphone group having two microphone pairs arranged at intervals, the fifth microphone not
on the plane made by the two microphone pairs, and the microphones constituting the two
microphone pairs And the horizontal angle of the sound source direction is estimated from the
ratio of the phase difference between the two pairs of microphone pairs, and the phase difference
between the microphones constituting the two pairs of microphones, and the fifth microphone
Microphones constituting four pairs of microphones each consisting of the four microphones
constituting the two pairs of microphones Characterized in that the measured sound source data
with the sound source estimating apparatus and a sound source direction estimating means for
estimating the elevation of the sound source direction using a phase difference between the
phones. By using the sound source estimation apparatus having such a configuration, it is
possible to accurately estimate the sound source direction and the magnitude of the sound
pressure signal with a smaller number of microphones as compared to the case of using a
microphone array.
[0012]
The invention according to claim 5 propagates from a designated area using sound source data
including data of the sound source direction of one or more sound sources measured at a
predetermined observation point and data of the magnitude of the sound pressure signal. Method
of reproducing the sound to be generated, wherein the horizontal angle and the elevation angle
are taken as coordinate axes using the data of the horizontal angle and the data of the elevation
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angle which are data of the sound source direction of the sound source and the data of the
magnitude of the sound pressure signal. The steps of creating a sound source map displaying the
sound source direction and the magnitude of the sound pressure signal on a map for each
frequency, dividing the sound source map into a plurality of spatial regions, and sound pressure
for each frequency of each spatial region A step of respectively calculating a band power value
which is a magnitude of a sound pressure signal for each octave band from the magnitude of the
signal and a power ratio which is a ratio of the calculated band power value for each octave band
Scaling the calculated band power value for each octave band using the step and the calculated
power ratio; and using the scaled band power value to select one of the plurality of spatial
regions. And reproducing the sound pressure waveform of the sound propagated from the
designated area which is the designated space area. Thereby, the sound pressure waveform of
the sound propagated from the designated area can be reproduced in a short time without
performing complicated calculations.
[0013]
The invention according to claim 6 propagates from a designated area using sound source data
including data of the sound source direction of one or more sound sources measured at a
predetermined observation point and data of the magnitude of the sound pressure signal. Method
of reproducing the sound to be generated, wherein the horizontal angle and the elevation angle
are taken as coordinate axes using the data of the horizontal angle and the data of the elevation
angle which are data of the sound source direction of the sound source and the data of the
magnitude of the sound pressure signal. The steps of creating a sound source map displaying the
sound source direction and the magnitude of the sound pressure signal on a map for each
frequency, dividing the sound source map into a plurality of spatial regions, and sound pressure
for each frequency of each spatial region A step of respectively calculating a band power value
which is a magnitude of a sound pressure signal for each octave band from the magnitude of the
signal and a power ratio which is a ratio of the calculated band power value for each octave band
Extracting a band waveform which is a sound pressure waveform for each octave band from the
sound pressure signal for each frequency in each space region, the size of the extracted band
waveform, and the calculated power ratio Correcting the calculated band power value for each
octave band using T.sub.k, and propagating from a designated area which is a designated space
area of the plurality of space areas using the corrected band power value. And b. Reproducing
the sound pressure waveform of the sound to be played. As described above, the band pressure
calculated by extracting the sound pressure signal of the sound source and extracting the band
waveform which is the sound pressure waveform for each octave band and using the size of the
extracted band waveform and the calculated power ratio By correcting the power value for each
octave band, it is possible to accurately reproduce the size of the sound transmitted from the
designated area.
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[0014]
The summary of the invention does not enumerate all necessary features of the present
invention, and a subcombination of these feature groups can also be an invention.
[0015]
It is a figure which shows the structure of the reproduction | regeneration apparatus of the
propagation sound which concerns on embodiment of this invention.
It is a figure which shows an example of a sound source map. It is a figure which shows an
example of the dividing method of a sound source map. It is a figure which shows the calculation
method of a band power value. It is a figure which shows the calculation method of a band power
value. It is a figure which shows the correction method of band power value. It is a figure which
shows the method to reproduce | regenerate the sound pressure waveform of the sound
propagated from a designated area | region. It is a figure showing an example of a display map. It
is a flowchart which shows the reproduction | regeneration method of the propagation sound
which concerns on this Embodiment. It is a figure which shows the structure of a sound source
estimation apparatus. It is a flowchart which shows the other example of the reproduction |
regeneration method of the propagation sound by this invention. It is a figure which shows the
arrangement of the microphone in the sound source location method using the conventional
microphone pair. It is a figure which shows an example of the display screen which displayed the
sound source direction estimation image.
[0016]
Hereinafter, the present invention will be described in detail through the embodiments, but the
following embodiments do not limit the invention according to the claims, and all combinations
of the features described in the embodiments are not limited. It is not necessarily essential to the
solution of the invention.
[0017]
FIG. 1 is a view showing a configuration of a propagation sound reproducing apparatus 10
according to an embodiment of the present invention. The propagation sound reproduction
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apparatus 10 includes a data storage unit 11, a map generation unit 12, and a map division unit
13. Band power value calculation means 14, band power ratio calculation means 15, band
waveform extraction means 16, band power value correction means 17, sound pressure
waveform reproduction means 18, propagation sound reproduction means 19, image processing
means 20 And a sound source display means 21.
The data storage means 11 comprises a hard disk of a personal computer and the like, and each
means of the map creating means 12 to the sound pressure waveform reproducing means 18
and the image processing means 20 comprise software of a personal computer. Further, the
propagation sound reproducing means 19 is constituted by a speaker or the like, and the sound
source display means 21 is constituted by a display or the like of a personal computer. The data
storage means 11 includes sound source data including data of the sound source direction of one
or more sound sources measured at a predetermined observation point using the sound source
estimation device 30 described later and data of the magnitude of the sound pressure signal and
the observation The image data of the image of the sound source direction taken from the point
is stored. The data of the sound source direction is data of the horizontal angle θ formed by the
observation point and the sound source to be estimated and data of the elevation angle φ. The
magnitude of the sound pressure signal is determined for each frequency.
[0018]
The map creating means 12 creates a map in which the horizontal axis is the horizontal angle θ
and the vertical axis is the elevation angle φ, and data of the sound source direction of each
sound source stored in the data storage means 11 (θ, The sound source map 12M as shown in
FIG. 2 is created by displaying φ) and the magnitude af (θ, φ) of the sound pressure signal
whose sound source direction is (θ, φ) and the frequency is f. Note that, in practice, on the
memory of the computer, a map in which data of the sound source direction (θ, φ) and data of
the magnitude af (θ, φ) of the sound pressure signal are coordinate axes with the horizontal
angle θ and elevation angle φ. In the case of display, as shown in FIG. 2, the data is the sound
source direction data (θ, φ) at the center and the diameter is the magnitude of the sound
pressure signal af (θ, φ) as shown in FIG. ), And the pattern shows a circle C indicating a
frequency. In addition, in FIG. 2, in order to make a figure legible, the kind of displayed frequency
was made into five types. The map division means 13 divides the sound source map 12M into a
plurality of spatial regions as shown in FIG. As shown in FIG. 4, the band power value calculation
means 14 combines the amplitudes am, n, f (θ, φ) of the sound pressure signal for each
frequency to generate the amplitudes am, n of sound pressure signals for each octave band. After
n and F (θ, φ) are determined for each space region Gm, n, as shown in FIG. 5, the magnitudes
am, n and F (θ, φ) of the sound pressure signal for each octave band are A band power value
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pm, n (Fk) which is a size of the sound pressure signal in the space region Gm, n is synthesized
for each Gm, n, and an octave band is calculated. In the figure, circles Dm, n, k indicate band
power values pm, n (Fk) for each space region Gm, n, and the sizes of circles Dm, n, k indicate
band power values pm , n (Fk), and the pattern indicates the center frequency Fk of the octave
band. Fk indicates the center frequency of the octave band. In this example, one octave band is
used as the octave band. The center frequencies F1 to F9 are 31.5 Hz, 63 Hz, 125 Hz, 250 Hz,
500 Hz, 1 kHz, 2 kHz, 4 kHz, and 8 kHz, respectively. The bandwidth is Fk−Fk / √2 to Fk + Fk /
√2 (k = 1 to 9).
[0019]
The band power ratio calculating means 15 obtains, for each octave band, a power ratio Rm, n
(Fk) which is a ratio of the band power value pm, n (Fk) for each octave band calculated by the
band power value calculating means 14. The band waveform extraction means 16 is provided
with an octave band pass filter, takes out the magnitude A of the sound pressure signal of the
observed sound stored in the data storage means 11 and passes it through the octave band pass
filter to obtain each octave band. The sound pressure signal is extracted, and the magnitude A
(Fk) of the sound of the band pass for each octave band is obtained (k = 1 to 9). As shown in FIG.
6, the band power value correction means 17 uses the power ratio Rm, n (Fk) to set the
magnitude A (Fk) of the sound of the band pass for each octave band of each space region Gm, n.
By allocating the space region Gm, n, the band power value pm, n (Fk) is converted into a
corrected band power value Pm, n (Fk) corrected by the magnitude A of the sound pressure
signal of the actually observed sound. . As shown in FIG. 7, the sound pressure waveform
reproducing means 18 is specified within the plurality of spatial regions Gm, n using the band
power value Pm, n (Fk) corrected by the band power value correcting means 17. The sound
pressure waveform of the sound propagated from the designated area GM, N which is the space
area is reproduced.
[0020]
The propagation sound reproduction means 19 is composed of, for example, a speaker, receives
the sound pressure waveform reproduced by the sound pressure waveform reproduction means
18, and outputs the sound propagated from the designated area. The image processing means 20
creates a display map with the horizontal angle θ and the elevation angle φ as coordinate axes
and divides this display map into space areas, and the observation points stored in the data
storage means 11 in each space area The image data of the image in the direction of the sound
source taken from and the corrected band power value Pm, n (Fk) are allocated. Since the range
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of the horizontal angle θ and the range of the elevation angle φ and the division method of the
display map are the same as the sound source map 12M, the sound source map 12M may be
used as it is. The sound source display means 21 has a display screen 21M, and displays a
display map created by the image processing means 20 as shown in FIGS. 8 (a) and 8 (b) on the
display screen 21M. (A) A figure is an example in case a main sound source is one place, (b) A
figure is an example in case a main sound source is two places.
[0021]
Next, a method of reproducing propagation sound according to the present invention will be
described with reference to the flowchart of FIG. First, the sound source data including the sound
source direction of the sound source measured at a predetermined observation point and the
magnitude of the sound pressure signal are taken out from the data storage means 11 (step S10).
As shown in FIG. Then, the sound source map 12M is created in which the sound source direction
(.theta., .Phi.) And the magnitude af (.theta., .Phi.) Of the sound pressure signal are displayed on
the map whose ordinate is the elevation angle .phi. (Step S11). In this example, sound source data
including the sound source direction of the sound source measured at a predetermined
observation point and the magnitude of the sound pressure signal was determined using the
sound source estimation device 30 as shown in FIG. Specifically, as shown in FIG. 2, with the
entrance of a factory (not shown) as an observation point, it was measured from which part of
machine tool H in the factory noise was generated. The sound source estimation device 30
includes measurement microphones M1 to M5 disposed at observation points to measure a
sound pressure level of noise from a noise source (not shown), and a CCD camera (hereinafter
referred to as , A camera, and a low pass filter, and an amplifier 32 for taking out and amplifying
a component having a predetermined frequency or less from acoustic information collected by
the measurement microphones M1 to M5, and digitalizing amplified acoustic information (analog
signal) A / D converter 33 for converting into a signal, a video input / output unit 34 for
converting image information (analog signal) of the camera 31 into a digital signal, sound
pressure signals of A / D converted measuring microphones M1 to M5 A sound source direction
estimating means 35 for estimating the sound source direction and the magnitude of the sound
from the sound source using It includes an image combining unit 36 for generating an image to
which an image indicating the direction, and a sound source position display means 37 for
displaying the synthesized image.
[0022]
The reference numeral 40 denotes a microphone frame for arranging the measurement
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microphones M1 to M5 at a predetermined position, and the reference numeral 41 denotes a
support member 42 formed of a tripod and a rotary table 43 provided on the upper portion of
the support member 42 It is a base. The sound source direction can be estimated in all directions
by rotating the microphone frame 40 and rotating the measurement microphones M1 to M5 in
the horizontal plane by the rotation table 43. As shown in FIG. 12, the measurement
microphones M1 to M4 include two microphone pairs (M1, M3) and microphone pairs (M2, M4)
arranged at predetermined intervals on two straight lines orthogonal to each other. And the
microphone M5 is disposed at a position not on the plane made by the microphones M1 to M4.
Thereby, the sound source direction viewed from the observation point can be estimated from
the phase difference (time delay Dij) of each microphone pair (Mi, Mj). The horizontal angle θ
and the elevation angle φ, which are incident directions of sound, can be expressed by the
following equations (1) and (2). Here, the time delay Dij is a time difference between the sound
pressure signal arriving at the microphone Mi and the sound pressure signal arriving at the
microphone Mj to be paired with the microphone Mi, and the two microphones Mi The cross
spectrum P ij (f) of the signal input to M j is obtained, and further, it is calculated according to
the following equation (3) using phase angle information Ψ (rad) of the target frequency f. The
sound source direction estimating means 35 uses the data of the sound pressure signal collected
by the measurement microphones M1 to M5, which are A / D converted by the A / D converter
33, to calculate the horizontal angle θ and the elevation angle φ as the sound source direction.
Estimate and measure the magnitude of the sound pressure signal. The sound source direction
and the magnitude of the sound pressure signal are measured for each frequency. Further, the
magnitude A5 of the signal input to the microphone M5 is assumed to be the magnitude A of the
sound pressure signal of the observed sound. On the other hand, the image synthesizing means
36 generates an image in which an image showing the estimated sound source direction is added
to the video signal in the sound source direction inputted to the video input / output unit 34 and
sends this to the sound source position display means 37 Display. Then, the position of the sound
source is determined from the image in which the sound source direction is indicated. In this
example, the data storage unit 11 stores data of the sound source direction, data of the
magnitude of the sound pressure signal, and image data captured by the camera 31 and A / D
converted by the video input / output unit 34. However, the data of the image combined by the
image combining unit 36 may be stored in the data storage unit 11.
In this case, creation of the sound source map 12M can be omitted.
[0023]
Next, after the sound source map 12M is divided into a plurality of space regions (step S12),
band power values pm, n (Fk), which are the magnitudes of sound pressure signals for each
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octave band, are calculated for each space region Gm, n. (Step S13). FIG. 3 is a diagram showing
an example of division of the sound source map 12M. The range of the horizontal angle θ and
the range of the elevation angle φ are -80 ° <θ ≦ + 80 °, -50 ° <φ ≦ + 50 °, and the
horizontal angle θ Assuming that the width is 40 ° and the division width of the elevation angle
φ is 20 °, the sound source map 12M is divided into 20 space regions Gm, n (m = 1 to 4, n = 1
to 5). First, as shown in FIG. 4, the band power value is calculated by combining the amplitudes
am, n, f (θ, φ) of the sound pressure signal for each frequency to obtain the amplitudes am of
the sound pressure signal for each octave band, Determine n, F (θ, φ), and then, as shown in
FIG. 5, combine the amplitudes am, n, F (θ, φ) of the sound pressure signal for each octave band
per spatial region Gm, n. Then, the band power values pm, n (Fk) in the space region Gm, n are
respectively calculated. That is, when there are sound pressure signals for each of a plurality of
octave bands in the space region Gm, n, the band power values pm, n (Fk) can be obtained by
combining the plurality of sound pressure signals into one sound pressure signal. calculate. At
this time, if the calculated band power value pm, n (Fk) is less than a preset threshold K (Fk), the
sound pressure of the octave band whose center frequency is Fk in the space region Gm, n
Consider no signal. This can reduce the calculation time.
[0024]
After calculating the band power value pm, n (Fk), a power ratio Rm, n (Fk) which is a ratio of the
band power value pm, n (Fk) is obtained for each octave band (step S14). For example, as shown
in FIG. 5, the spatial region in which the sound source having the band power value pm, n (F5) of
the 500 Hz band having a size equal to or larger than the preset threshold K (F5) is G2, 2, G3, In
the other space region Gm, n where pm, n (F5) = 0 in four of 2, 2, 3, 3, G4, 3, the power ratio Rm,
n (F5) in the space region Gm, n (F5) ) Is calculated from the following equation. Rm, n (Fk) = pm,
n (F5) / {p1,1 (F5) + p2,2 (F5) +... + P20, 20 (F5)} For example, the space regions G2, 2, G3, 2, G3
, 3, G4, 3 have band power values of p2, 2 (F5) = 10, p3, 2 (F5) = 6, p3, 3 (F5) = 3, p4, 3 (F5) = 1,
etc. Assuming that pm, n (F5) = 0 in the space area Gm, n, the power ratio Rm, n (F5) of the space
areas G2, 2, G3, 2, G3, 3, G4, 3 is R2, 2 (F5) = 0.5, R3, 2 (F5) = 0.3, R3, 3 (F5) = 0.15, R4, 3 (F5) =
0.05, and the other space region Gm, n Then, pm, n (F5) = 0.
[0025]
In step S15, a band waveform which is a sound pressure waveform for each octave band is
extracted from the magnitude A of the sound pressure signal of the sound source stored in the
data storage unit 11, and the band for each octave band which is the size of the band waveform
is extracted. Find the loudness A (Fk) of the sound of the pass. Here, assuming that B (Fk, t) is
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time history band pass waveform data for each octave band, the sound pressure signal f (t) of the
sound source is f (t) = A (F1) · B (F1, t) + A (F2) .B (F2, t) +... + A (F8) .B (F8, t) + A (F9) .B (F9, t).
This step may be performed anywhere before the next step S16. In step S16, the band power
values pm and n (Fk) calculated in step S14 are corrected to actually observed band power values
using the magnitude of the sound measured at the observation point. The corrected power value
is hereinafter referred to as a correction band power value Pm, n (Fk). That is, since the
magnitude A (Fk) of the sound of the band pass for each octave band is equal to the average of
the sum of squares of the correction band power values Pm, n (Fk) for each octave band in each
space region Gm, n, As shown in FIG. 6, using the power ratio Rm, n (Fk), the band power value
pm, n (Fk) of each space region Gm, n using the magnitude A (Fk) of the sound of the band pass
for each octave band. If it is assigned, the band power value pm, n (Fk) can be corrected to the
correction band power value Pm, n (Fk) which is the band power value of the actual sound
pressure waveform. By using these correction band power values Pm, n (Fk), the sound pressure
waveform of the sound propagated from each space region Gm, n can be reproduced including
the magnitude of the sound. In this example, as shown in FIG. 7, an area for reproducing sound is
designated from among a plurality of space areas Gm, n (step S17), and propagation is performed
from the designated area GM, N which is the designated space area. Only the sound pressure
waveform of the sound is reproduced (step S18). Specifically, it is assumed that the square root
of the band power value PM, N (Fk) of the designated area GM, N is aM, N (Fk), and the time
history band pass waveform data for each octave band is B (Fk, t). The sound pressure waveform
fM, N (t) of the sound propagated from the designated area GM, N can be expressed by the
following equation. fM, N (t) = aM, N (F 1) · B (F 1, t) + aM, N (F 2) · B (F 2, t) + ......... + aM, N (F 8) ·
B (F 8, t) ) + AM, N (F9) · B (F9, t)
[0026]
In step S19, the display screen 21M in which the image data of the image of the sound source
direction taken from the observation point is allocated on the display map divided into a plurality
of space regions Gm, n with the horizontal angle θ and the elevation angle φ as coordinate axes.
The sound pressure waveform fM, N (t) of the sound propagated from the designated area GM, N
obtained in step S18 is reproduced using the speaker while being displayed. At this time, as
shown in FIGS. 8 (a) and 8 (b), the designated area GM, N is surrounded by a frame on the display
screen 21M, and the sound output from the speaker is shifted to the designated area GM, N. If
the correspondence between the sound source of the sound emitted from a building or a device
and the propagation sound can be taken, the sound source and the characteristic sound emitted
by the sound source can be reliably grasped. Next, it is determined whether to end the
reproduction of the sound (step S20). When the sound propagated from another designated area
GM ', N' is to be reproduced, the process returns to step S17, and the band power value PM ', N'
(Fk) of the designated area GM ', N' is used to designate the designated area GM. The sound
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pressure waveforms fM 'and N' (t) of the sound propagated from 'and N' are reproduced.
[0027]
Thus, in the present embodiment, using sound source data including data of the sound source
direction of the sound source measured at a predetermined observation point obtained using the
sound source estimation device 30 and data of the magnitude of the sound pressure signal After
creating the sound source map 12M in which the sound source direction and the sound pressure
signal size are displayed for each frequency on the map with the horizontal angle θ and the
elevation angle φ viewed from the observation point as coordinate axes, this sound source map
12M is divided into a plurality of spaces Divide into regions Gm, n and calculate the band power
value pm, n (Fk) which is the magnitude of the sound pressure signal for each octave band Fk
from the magnitude of the sound pressure signal for each frequency in each space region Gm, n
The power ratio Rm, n (Fk), which is the ratio of the band power values, is calculated, and the
power ratio Rm, n (Fk) Sound size A (Fk) The band power value pm, n (Fk) is corrected using the
following equation, and the corrected band power value Pm, n (Fk) is used to transmit the sound
propagated from the designated region GM, N, which is the designated space region. Since the
sound pressure waveform is reproduced, the sound pressure waveform of the sound propagated
from the designated area GM, N can be reproduced easily and in a short time. Further, a
propagation sound reproducing means 19 such as a speaker is provided to output sound
propagated from the designated areas GM, N, and image data in the sound source direction in a
space area including the designated areas GM, N is a sound source display means such as a
display Since the display is made at 21, it is possible to reliably grasp the characteristics of the
sound transmitted from the designated area GM, N.
[0028]
In the above embodiment, the sound source is noise generated by the machine tool H in the
factory. However, the observation target is not limited to this, and the outdoor such as the area
with the factory shown in FIG. It may be a noise source of Further, although the sound source
map 12M is divided into 20 space regions Gm, n in the above example, the number of divisions is
not limited to this, and may be set arbitrarily according to the observation target. Although other
sound source estimation devices using a microphone array may be used to acquire sound source
data, the sound source direction and the sound pressure signal can be obtained with a small
number of microphones if the sound source estimation device 30 is used as in this example. Can
accurately estimate the size of Also, in the above example, the magnitudes am, n, f (θ, φ) of the
sound pressure signals for each frequency are combined to obtain the magnitudes am, n, F (θ,
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φ) of the sound pressure signals for each octave band. The sound pressure waveform of the
sound propagated from the designated area GM, N is found and then reproduced. However, the
magnitudes of the sound pressure signal am, n, F (every The reproduction accuracy can be
further improved by obtaining θ, φ) or obtaining the magnitudes am, n, F (θ, φ) of the sound
pressure signal for each 1⁄3 octave band.
[0029]
When it is not necessary to reproduce the magnitude of the sound of the sound pressure
waveform of the sound propagated from each space area Gm, n, that is, when only the sound
quality is required, the band waveform extraction means 16 and the band power The value
correction means 17 may be omitted, and the voice waveform may be reproduced using the
power ratio calculated by the band power ratio calculation means 15. A flowchart in this case is
shown in FIG. The steps from step S10 to step S14 are the same as in FIG. In step S21
immediately after step S14, the band power value pm, n (Fk) calculated using the power ratio Rm,
n (Fk) is standardized for each octave band. As described in step S14, since the total of the power
ratio Rm, n (Fk) is 1, assuming that the standardized sound size is A0, the standardized band
power value p'm, n (Fk ) Is p'm, n (Fk) = A0.Rm, n (Fk). In step S22, as in step S17, an area for
reproducing sound is designated from among the plurality of space areas Gm, n. In step S23, only
the sound pressure waveform of the sound propagated from the designated area GM, N which is
the designated space area is reproduced. Assuming that a'M, N (Fk) is a square root of the
standardized band power values p 'M, N (Fk) of the designated area GM, N, the sound pressure
waveform f of the sound propagated from the designated area GM, N 'M, N (t) is f' M, N (t) = a 'M,
N (F 1) B (F 1, t) + a' M, N (F 2) B (F 2, t) + ... ... a'M, N (F8) .B (F8, t) + a'M, N (F9) .B (F9, t). Here, B
(Fk, t) is time history band pass waveform data for each octave band.
[0030]
In step S24, the display screen 21M in which the image data of the image of the sound source
direction taken from the observation point is allocated on the display map divided into the
plurality of space regions Gm, n with the horizontal angle θ and the elevation angle φ as
coordinate axes. While displaying, the sound pressure waveform f'M, N (t) of the sound
propagated from the designated area GM, N obtained in step S23 is reproduced using the
speaker. Thereafter, it is determined whether or not the reproduction of the sound is to be ended
(step S25), and in the case of reproducing the sound propagated from another designated area
GM ′, N ′, the process returns to step S22 and the power ratio Rm, n (Fk Sound pressure
waveform f′M ′, N ′ (t of sound propagated from the designated region GM ′, N ′ using the
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standardized band power value p′m, n (Fk) calculated using Play).
[0031]
As described above, according to the present invention, the sound pressure waveform of the
sound propagated from the designated area can be reproduced easily and in a short time, so that
the characteristics of the observed sound source can be efficiently grasped. it can.
[0032]
DESCRIPTION OF SYMBOLS 10 Reproduction apparatus of propagation sound, 11 data storage
means, 12 map creation means, 12M sound source map, 13 map division means, 14 band power
value calculation means, 15 band power ratio calculation means, 16 band waveform extraction
means, 17 band power value Correction means, 18 sound pressure waveform reproduction
means, 19 propagation sound reproduction means, 20 image processing means, 21 sound source
display means, 21 M display screen, 30 sound source estimation device, M1 to M5 measuring
microphones, 31 CCD cameras, 32 amplifiers, 33 A / D converter, 34 video input / output units,
35 sound source direction estimation means, 36 image combining means, 37 sound source
position display means, 40 microphone frame, 41 measurement base, 42 support members, 43
rotary table.
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