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# JPS61261998

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DESCRIPTION JPS61261998
[0001]
[Industrial field of application] In the present invention, three or more sound wave detectors are
arranged in a polygonal shape, and the sound wave incident angle ? is at most 90 among the
sound wave incoming directions measured by each pair of sound wave detectors. The present
invention relates to a sound wave measurement method in which the measurement error of the
sound wave incoming direction is minimized by adopting the ones measured in pairs close to one
another. [Prior Art] A difference in arrival time of sound waves reaching two sound wave
detectors installed at a predetermined interval, or a phase difference between outputs of two
sound wave detectors is measured to obtain a first-order (1) Techniques for determining the
direction of arrival of the sound wave by means of equations are well known. theta = Yes (C?ts /
d) ииииииииииии (1) In this equation (1), (see FIG. 3) wave incident angle theta, d is two sonic detectors
The distance between 1 and 2, C is the velocity of the sound wave S, and ? 1 is the arrival time
difference between the sound wave detectors 1.2. [Problems to be Solved by the Invention]
However, when measuring the time difference ? 2 arriving at the two sound wave detectors 1
and 2 and trying to obtain the direction of arrival of the sound wave S by the equation (1), When
a measurement error occurs in the arrival time difference ?12, the measurement error in the
direction of arrival of the sound wave S is expanded in proportion to 1 / ??. From this, the
measurement error of the sound wave arrival direction becomes minimum when the sound wave
S is incident at a sound wave incident angle ? of 90 degrees, that is, at right angles to the line
connecting the two sound wave detectors 1.2. In addition, even if the arrival time difference ?L2
is accurately measured, a measurement error of the sound wave arrival direction also occurs
when there is a disturbance other than the target sound wave S. For example, assuming that the
disturbance is a diffuse sound field, there is a relationship of the following equation (2) between
the true sound wave incident angle ? and the measured incident angle ?. It will be. In (2) ?, k
is the wave number of the sound wave-GOIGl is the auto power spectrum of the target sound
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wave and the disturbance, respectively. As clearly shown in FIG. 4, also in this case, when the
sound wave incident angle ? is ? = 90 degrees, the measurement error of the sound wave
incoming direction becomes minimum, and the sound wave incident angle ? deviates from ? =
90 degrees Measurement errors increase rapidly. In the conventional sound wave arrival
direction measurement method, the problem of measurement error as described above is not
taken into consideration. There was a problem with the measurement accuracy. The present
invention has been made to eliminate the above-mentioned conventional drawbacks, and an
object of the present invention is to provide an acoustic measurement method which minimizes
measurement error and improves measurement accuracy. [Means for Solving the Problems] In
the sound measurement method according to the present invention, in which the incident
direction of the sound wave is measured using a plurality of sound wave detectors, at least three
or more of the above-mentioned sound wave measuring instruments are arranged in polygons At
the same time, the measurement value of the pair closest to 90 degrees is adopted at each sound
wave incident angle with respect to each reference line connecting the sound wave detectors
forming the pair.
[Operation] The present invention extracts the measurement value measured by the pair of
sound wave detectors whose incident angle with respect to each pair is closest to 90 degrees
among the sound wave arrival directions measured by the sound wave detectors of each pair It is
the arrival direction of the sound wave to be sought. Embodiments of the sound wave measuring
method according to the present invention will be described hereinbelow with reference to the
drawings. FIG. 1 is a diagram for explaining the one embodiment, and shows an example of
arrangement of the sound wave detectors by taking three cases as an example. Further, FIG. 2 is
a schematic configuration diagram showing an example in the case of using three detectors in
the processing procedure for realizing the present invention. In FIG. 1, 1, 2.3 is a sound wave
detector, and an angle ?, (1 = J, 2.3) is a pair of sound wave detectors 1 and 2. Sound wave
detector 2 and 3. And the setting angle with respect to the reference axis 40 when the sound
wave detectors 3 and 1 are arranged. Further, ?, (1 = 1.2.3) is a sound wave incident angle
measured by each pair of sound wave detectors. Next, in FIG. 2, 4 and 5.6 indicate pairs of sound
wave detectors 1 and 2. Using the outputs of the sound wave detectors 2 and 3 and the sound
wave detectors 3 and 1, the sound wave incident angle ? 1 (i = 1, 2.3) is determined by the
above (1) ? and the reference axis 40f illustrated in FIG. This is an arithmetic circuit for
calculating a total of six sound wave arrival direction angles ?I ▒ ?I (1 = 1 ░ 2.3), each of
which is a reference value. Six sound wave arrival direction angles ? j (j = 7.2.) Determined by
these arithmetic circuits 4 and 5.6. There are three in principle equal in 6). The three equal
angles are extracted by the arithmetic circuit 7, and the arithmetic circuit 7 causes the sound
wave incoming direction angles ? j (j = 7, 2. Using 6), 1 + 2 +... + 5 = 15 sound wave arrival
direction angles 1?1-?kl (j = 7). 2,..., 6, J # k) are determined, and three sound wave arrival
direction angles ?l satisfying 1 <?? at the sound wave arrival direction angle 1?j?? with
respect to the preset tolerance angle ? ??Do. The approximately equal three sound wave
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arrival direction angles ?! Extracted by the arithmetic circuit 7. Of the three sound wave incident
angles ?1 among the three sound wave incident angles ?l, the sound wave incident angle ?1
corresponding to the sound wave incident angle ? of which is closest to 90 degrees is extracted
by the arithmetic circuit 8 and the absolute value of the difference of 90 Select The sound wave
arrival direction angle corresponding to the sound wave incident angle ? 1 closest to 90 degrees
selected by the arithmetic circuit 8 is displayed on the display unit 9. Although the example in
the case of using three sound wave detectors 1 and 2. 3 t 1-has been described above, when n
sound wave detectors are used, n (n-1) / 2 incident angles ? 1 ( n (n-1) sound wave arrival
direction angles are determined for j = 1.2 ...., n (n-1) / z).
In the same manner as in the case of three sound wave detectors, n (n-1) / 2 approximately equal
angles are extracted, and from this, the sound wave arrival direction angle whose sound wave
incident angle ?l is closest to 90 degrees is determined Thus, the present invention is realized.
In addition, this invention is applicable to the sound wave arrival direction measuring apparatus
in air | atmosphere, water, or solid. When the sound wave detectors 1 to 3 are arranged in a
polygonal shape, there is no restriction on the shape of the polygon, but it is preferable to
arrange the sound wave detectors in a regular polygon shape. As described above, according to
the sound wave arrival direction measuring apparatus of the present invention, three or more
sound wave detectors are arranged in a polygonal shape, and sound wave arrival measured by
each pair of sound wave detectors is obtained. Among the directional angles, since the value
measured by the pair in which the sound wave incident angle is closest to 90 degrees is adopted
is adopted, the sound wave arrival direction angle with the highest accuracy can be obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows the arrangement of the sound wave detector applied to the sound wave
measurement method of the present invention, and FIG. 2 shows the processing procedure of the
signal detected by the sound wave detector applied to the sound wave measurement method of
the present invention. FIG. 3 is a block diagram showing the system, FIG. 3 is a diagram showing
the arrangement relationship of sound wave detectors in the conventional sound measurement
method, and FIG. 4 is a relation between true sound wave incidence angle and measured sound
wave incidence angle in the conventional sound wave measurement method FIG.
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1 to 3 ... sound wave detector, 4 to 8 ... arithmetic circuit, 9 ... display device.
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```
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