Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. 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 03-05-2019 1 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 03-05-2019 2 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. 03-05-2019 3 1 to 3 ... sound wave detector, 4 to 8 ... arithmetic circuit, 9 ... display device. 03-05-2019 4

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