地域別騒音の場所的分布 第10報 : 東京都内の劇場街の騒音
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(2) »igft»*'-iNim (^2g-|iA) ^38-^ IS 2^- BSW63^3^ Journal of Hokkaido University of Education (Section H A) Vol. 38, No. 2 March, 1988. Noise Distribution Report No. 10 Theater Quarter Noises in Tokyo Shigeru TAKEUCHI Physics Laboratory, Asahikawa College, Hokkaido University of Education Asahikawa 070. mwm^^??^. {AW XwW<7)|HJWo!l$:t. ^ n ^ ^mmia^w^ww^m Abstract We report the summarized result of measurements made of noises in the neighbourhood of three Tokyo theaters. The measurements were carried out from about the end of July until. the early of Aug., 1986, in the neighbourhood of the Asakusa Theater, the Ginza Theater and the Shinjyuku Theater. At each of the above mentioned sites the noises were measured at 10 different point, chosen by an arbitrary sampling method. The main results are as follows : a) Sound levels and conditions at each of the measuring points are shown in Table 1—3. b) Examples of the measurement of noise levels near each theater are summarized in Fig. 1 -6.. c) Photographs of the representative landscapes of each theater site.. 1. Introduction. Street noises in Tokyo have already been measured by J. Morita (1953)", while the noise distribution in various zones has been measured by T. Mochizuki and N. Imaizumi (1967)2'. Noise-induced shifts in the pitch of pure and complex tones have also been studied by Adrianus J. M. Houtsma (1981)3'. The noises of busy streets, underground markets and park quarters in. Tokyo and Sapporo have subsequently been measured by S. Takeuchi (1982)4>, (1984)6', (1985)8', (1986)9', (1986)10' and (1987)12', who has also measured commercial, industrial, residential and amusement zone noises in Asahikawa (1983)5>, (1985)7' and (1987)'1). The purpose of the present. (9).
(3) 10. Shigeru TAKEUCHI. investigation was to measure noises around certain Tokyo theaters, as calculated by a sound. level meter (type 1015A). Accordingly, three locations were selected : the Asakusa Theater, the Ginza Theater and the Shinjuku Theater. Noises were measured at 10 different points at the above mentioned sites, some of the points chosen arbitrarily. The meaning of arbitrary selection is as follows. In arbitrary selection the observation points are chosen so as to. represent the general level of noise in the area. At each point, the sound level in dB (A) is measured 50 times at intervals of 5 seconds. If N. L.-variation from time to time is divided into. M (M -^co) N. L. s having equal durations which are sufficiently small AT, the average value ofN.L.s lim-. -(tjr. (D. V.L.dt,AT=T/M. M—»A 1 J t" " " ' " ". and each is considered to represent one 'instant value'.. The sound level in the AT eterm at the unit variation,. (2). m/M=f(x}dx, F(x)=f_f(x) dx, F(w)=\. f{x}dx and F(x) is the ratio of the number of the unit variation in the T. At the same time F{x) and f(x) is the N. L. s time rate distribution and density function in the T. The Mode, Median and 90% range were obtained statistically from these 50 pieces of data to represent the noise level distribution. These precedures are in accordance with the Japanese Industrial Standard JJSZ-8731 "Methods of Measurement of Sound Levels".. 2. Result of investigation a) Asakusa Theater site Table 1 Sound levels and conditions of the measuring points : Asakusa Theater site, Tokyo Zone. Category. Commercial Test No.. (D (D. (3). Time 11.30 11.35 11.42. ® © ® ® ®. 12.10. ®. 12.43. @. 11.53 12.02 12.22 12.29 12.35. Theater site. Sound levels dB (A) Mode. Median. 65 65 71 74 62 63 63 59 58 57. 65 65 72 73 62 63 63 59 58 57. (10). 90% range 63-70 64-70 69-80 69-78 61-65 62-65 61-67 58-65 56-64 55-59.
(4) 11. Noise Distribution. Asakusa Theater site A : the Asakusa-Jinjya B : the Asakusa-Kannon. ^. C: the Denpoin D: the Nakamise E : the Shushiya Street F: the Shochiku-Engeijyo G: the Asakusa-Nominoichi. ;^v;?^p.. 3.^I1=: I^01' "/ l-tp'-'' ^-»"i'. H : the Toho-Takarazuka I: the Asakusa-Meigaza J : the Asakusa-Toei. J. Asakusa 2. feV^, ^ J/®u . 1l^-=^-. I ?3®,ilfii ^n1^'^ ^ 90. <;:. Fig. 1 Examples of measurement at theater site : Asakusa Theater site, Tokyo 10 measuring points and sound levels obtained.. (ID.
(5) 12. Shigeru TAKEUCHI. Photo. 1 Asakusa-chuo Theater &. Asakusa Meigaza ( ® ). Let us first examine the noise levels near the Asakusa Theater; the theater is located in a street devoted to mass entertainment. It is bounded on the north by 2 chome, Asakusa, on. the south by 1 chome, Asakusa. Table 1 and Fig. 1 illustrate the detailed data and the average sound level at 10 different points selected arbitrarily around the Asakusa Theater. Low speaker noises and distant vehicular traffic noises show that it is a quiet place. The measured results, which were obtained in the way described above, are shown in Table 1. As in the lower part of Fig. 1, the median sound levels are arranged in an order increasing in magnitude as the. circular spots plot the measured values in the same figure, while the mode is represented by the black spots. Solid lines move up and down to show the difference within a 90% range. A central solid line shows the average value of the medians and indicates that the average sound level is 63.7 dB (A). The dotted lines show both its lowest and highest points as well as the average values with both lower limit values and upper limit values within a 90% range. Their average sound levels are shown as 61.8 and 68.3 dB (A) respectively. In the upper part of Fig. 1 values from CD to @ show the position of the measured points, while letters from A to J are used to show the most conspicuously noisy places at the Asakusa Theater site. Photo. 1 affords an example of this.. b) Ginza Theater site Let us now examine the noise levels near the Ginza Theater. The theater is situated in a. busy street which is famous as the show place of the latest Japanese fashions. It is bounded on the north by 2 chome, Ginza, on the south by 4 chome, Ginza. Table 2 and Fig. 2 illustrate the detailed data and the average sound level at 10 different points selected arbitrarily around. (12).
(6) 13. Noise Distribution. the Ginza Theater. The noisy sounds of both vehicular traffic and of many passersby show that it is a busy place. The measured results, which were obtained in the way described above, are shown in Table 2. As in the lower part of Fig. 2, the median sound levels are arranged in an order increasing in magnitude as the circular spots plot the measured values in the same. figure, while the modes are represented by the black spots. Solid lines move up and down to show changes within a 90 % range, A central solid line shows the average value of the median and indicates that the average sound level is 70.4 dB (A). Dotted lines show both its lowest and highest points as well as the average values with both lower limit values and upper limit values within a 90% range. Their average sound levels are shown as 65.3 and 77.4 dB (A) respectively. In the upper part of Fig. 2 values from (D to ® show the position of the measured points, while letters from A to G are used to show the most conspicuously noisy places near the Ginza Theater. Photo. 2 affords an example of this.. Table 2 Sound levels and conditions of the measuring points : Ginza Theater site, Tokyo Category. Zone. Theater site. Commercial Test No.. 0) (D (3). ® © ©. (!). ® ® ®. Time 10.25 10.39 10.49 11.04 11.13 11.23 11.36 11.46 11.58 12.15. Sound levels dB (A) Median. Mode. 68 69 73 71 67 69 69 75 71 72. 68 69 72 71 65 66 67 75 73 72. Ginza Theater site A : the Yuraku-cho Station B : the Toei-Kaikan C : the Ginza-Bunka Theater D: the Matsuya E : the Mitsukoshi F: the Ginza-Meigaza G : the Kabuki Performance Theater. (13). 90% range 66-77 66-79 67-79 65-78 62-72 64-80 66-78 66-76 66-78 65-77.
(7) Shigeru TAKEUCHI. 14. 90. © ® (D 80. <;. 1. CQ. ra. § <u. 0®. 70. •a. 0 I ® 0. (3 g 0 co. ®. ®. 60. 50 Fig. 2 Examples of measurement at theater site : Ginza Theater site, Tokyo 10 measuring points and sound levels obtaind.. P'^!?P'' [u^rti^ ,^,:l<^«. £ .' ""! !> I. A U t k 1-. Photo. 2 Kabuki Performance Theater ( @ ). (14).
(8) 15. Noise Distribution. c) Shinjyuku Theater site Table 3 Sound levels and conditions of the measuring points : Shinjyuku Theater site, Tokyo Zone. Category Theater site. Commercial Test No.. (D @. (D. ® © ® ® ®. ® ®. Time 14.55. Sound levels dB (A). 16.22 16.30. 81, 82. 15.19 15.29 16.08. 16.46 16.56 17.09. 90% range. 67 65 65 71 71 66 80 77 74 68. 66, 68. 65 63 71 73 65. 15.10. Median. Mode. 76 75 68. 64-72 64-70 63-76 66-75 65-81 65-71 74-83 75-80 70-76 65-72. LA^///, ^' ^. Shinjyuku Theater site A : the Shinjyuku Station B : the Showakan C : the Central Hotel D: the Isetan E : the Hanazono Shrine F : the Yotsuya Fifth Elementary School G : the Hotel Ishikawa H : the Shinjyuku Ward Office I: the Shinjyuku Coma Stadium J : the Shinjyuku Prince Hotel. T)Q%!t^ ^i-/ri*^. I. ^!^ i^M1^ ^'6'. 'Shiniyuku ^//.. L'S^^ I '^-. 'D)/. (15). J/.
(9) 16. Shigeru TAKEUCHI. 90. © © (D ®. 6 0 i. < m T3 D > D. 0 ®. 70 1 ®. T3 e 3 0. 7. U~l. 0. ® d. ®©®. 60. 50 Fig. 3 Examples of measurement at theater site : Shinjyuku Theater site, Tokyo 10 measuring points and sound levels obtained.. Photo. 3 Shinjyuku Koma Stadium ( @ ). (16).
(10) Noise Distribution 17. We also examined the noise levels near the Shinjyuku Theater. This theater is situated a busy street that is credited with being the most popular meeting place in Japan. It is bounded on the north by 1 chome, Kabuki-cho, on the south by 3 chome, Shinjyuku. Table 3 and Fig. 3 illustrate the detailed data and the average sound level at 10 different points selected arbitrarily along the Shinjyuku Theater site. Speaker noise and the vehicular traffic noise both show that it is a busy place. The measured results, which were obtained in the way described above, are shown in Table 3. As in the lower part of Fig. 3, the median sound levels are arranged in an order increasing in magnitude as the circular spots plot the measured values in. the same figure, while the mode is represented by the black spots. Solid lines move up and down to show the difference within a 90% range. A central solid line shows the average value of the median and indicates that the average sound level is 70.4 dB (A). The dotted lines show both its lowest and highest points as well as the average values with both lower limit values and upper limit values within a 90% range. Their average levels are shown as 67.1 and 75.6 dB (A) respectively. In the upper part of Fig. 3 values from (D to @ show the position of the measured points, while letter from A to J are used to show the most conspicuously noisy places near the. Shinjyuku Theater. Photo. 3 affords an example of this.. 36 Discussion a) Asakusa Theater site This area was the quietest in our sample and the average sound level was 64.1 dB (A), once. dropping to 55.0 dB (A). The lowest sound level was recorded in front of the Asakusa Toei ( @ ); this place is marked by few people and only distant vehicular traffic noises. But in front of the Asakusa Nominoichi ( ® ), the average sound level was 72.9 dB (A), because of recorded music and the light sounds of recorded music. The distribution percentage y of sound levels is give by the equation of the Gaussian distribution curve 1 (x-m)i. y = ^_-e ^ff2Tw". '"". (3). in which o" is the standard deviation, a2 the dispersion, x the sound level and m the average. sound level at the Asakusa Theater sitt. Fig. 4 is the relation between the sound level and the frequency percentage at the Asakusa Theater site. The solid line is calculated by the equation of the Gaussian distribution curve and the measured values are represented by the triangular spots. The measured values are very scattered, but their tendency coincides approximately. with the Gaussian distribution curve.. (17).
(11) 18. Shigeru TAKEUCHI. 15. 10. A. AA. A. 0^. I >>. g. A. Sound level dB (A). Fig. 4 Relation between the sound level and the frequency percentage in the Asakusa Theater site. The solid line is calculated by the equation of Gaussian distribution curve and the measured values are represented by the triangular spots.. b) Ginza Theater site In this area the sound levels are highest (70.9 dB (A) on average), often reaching 82—86 dB (A). For example, the highest sound levels were recorded in the neighbourhood of the GinzaMeigaza ( (8) ), where the average sound level was 74.0 dB (A); this was due to the noise 'of trains departing' of engine exhausts. But in the neighborhood of the Ginza-Bunka Theater ( © ), the average sound level was 67.4 dB (A), because there were neither high vehicular noises nor the sound of many passersby. In the same manner as for the preceding data, Fig. 5 shows. the relation between the sound level and the frequency percentage at the Ginza Theater site. The solid line is calculated by the equation of the Gaussian distribution curve and the measured. (18).
(12) 19. Noise Distribution. ^0 0''. g. cr <u. 51-. 65. 70 75. 85. 90. Sound level dB (A). Fig. 5 Relation between the sound level and the frequency percentage in the Ginza Theater site. The solid line is calculated by the equation of Gaussian distribution curve and the measured values are represented by the triangular spots.. values are represented by the triangular spots. The measured values almost coincide with the Gaussian distribution curve. c) Shinjyuku Theater site In this area the sound levels are comparatively high (69.6 dB (A) on average), often reaching 82—84 dB (A). For example, the highest sound levels were recorded in front of Miranoza ( ® ), where the average sound level was 77.3 dB (A); this was due to both the amplified voice of an announcer and the sounds of many passersby. But in the neighborhood of the Central Hotel( (D ), the average sound level was 65.8 dB (A), because there were neither loud vehicular. (19).
(13) 20. Shigeru TAKEUCHI. 15. A 10. A. I. >,. AA. &. 60. 65. 75. 70. 85. Sound level dB (A). Fig-. 6 Relation between the sound level and the frequency percentage in the Shinjyuku Theater site. The solid line is calculated by the equation of Gassian Distribution curve and the measured values are represented by the triangular spots.. noises nor speaker noises. In the same manner as for the preceding data, Fig. 6 shows the. relation between the sound level and the frequency percentage at Shinjyuku Theater site. The solid line is calculated by the equation of the Gaussian distribution curve and the measured values are represented by the triangular spots. The measured values are very scattered, but. their tendency coincides approximately with the Gaussian distribution curve.. 4. Conclusion. The average median sound levels at the Asakusa Theater site, the Ginza Theater site and. (20).
(14) Noise Distribution. 21. the Shinjyuku Theater site were 63.7, 70.4 and 70.4 dB (A) respectively; the average of the highest sound levels are 68.3, 77.4 and 75.6 dB (A) ; the average of the lowest sound levels are 61.8, 65.3 and 67.1 dB (A). The average levels of sound within a 100% range for the Asakusa Theater site, the Ginza Theater site and the Shinjyuku Theater site were 64.1, 70.9 and 69.6 dB (A) respectively, while the standard deviation of sound level was 5.43, 4.22 and 5.38 dB (A).. Reference. (D. (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12). S, Morita:. J. Acoust. Soc. Jpn. 9 (1953) 4.. T. Mochizuki and N. Imaizumi. J. Acoust. Soc. Jpn. 23 (1967) 3-4.. Adrianus J. M. Houtsma :. J. Acoust. Soc. Am. 70 (1981) 6.. S. Takeuchi. J. Hokkaido Univ. educ. 33(1982) 1.. S. Takeuchi. J. Hokkaido Univ. educ. 33 (1983) 2. S. Takeuchi. J. Hokkaido Univ. educ. 35 (1984) 1. S. Takeuchi. J. Hokkaido Univ. educ. 35 (1985)2.. S. Takeuchi. J. Hokkaido Univ. educ. 36(1985)1.. S. Takeuchi. J. Hokkaido Univ. educ. 36 (1986) 2. S. Takeuchi. J. Hokkaido Univ. educ. 37 (1986) 1. S. Takeuchi. J. Hoklcaido Univ. educ. 37 (1987) 2. S. Takeuchi. J. Hokkaido Univ. educ. 38 (1987) 1. (21).
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