All issues
Volume 23 (1999)
- Issue 6 Pages 370-
- Issue 5 Pages 297-
- Issue 4 Pages 205-
- Issue 3 Pages 125-
- Issue 2 Pages 61-
- Issue 1 Pages 3-
Predecessor
Volume 23, Issue 3
Displaying 1-14 of 14 articles from this issue
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Kohei Yamamoto1999 Volume 23 Issue 3 Pages 125-127
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Hirofumi Ohnishi1999 Volume 23 Issue 3 Pages 128-130
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Kyoji Fujiwara1999 Volume 23 Issue 3 Pages 131-136
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Shuji Hashimoto, Nobuhito Okamoto1999 Volume 23 Issue 3 Pages 137-141
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Naotaka Tomita1999 Volume 23 Issue 3 Pages 142-147
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Kiyonori Hachimine, Katsumi Uesaka1999 Volume 23 Issue 3 Pages 148-152
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Keizo Ohnishi, Masaharu Nishimura1999 Volume 23 Issue 3 Pages 153-159
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Takashi Miyama1999 Volume 23 Issue 3 Pages 160-164
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Shinichi Sueoka1999 Volume 23 Issue 3 Pages 165-169
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Yoshihito Mori1999 Volume 23 Issue 3 Pages 170-173
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Hiroshi Ikeda1999 Volume 23 Issue 3 Pages 174-178
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Iturou Murai1999 Volume 23 Issue 3 Pages 179-182
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
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Hiroaki Takinami, Tomoharu Wakabayashi, Toshiaki Koshiroi1999 Volume 23 Issue 3 Pages 183-188
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
JOURNAL FREE ACCESSRecently, some measurement methods using short-duration time-average sound pressure level have been proposed. When the measurement duration is very short (for example, less than 1s), because of the time delay caused by the exponential time weighting for sound level, the time-average sound pressure level determined from sampled sound level data sometimes differ from the time-average sound pressure level determined from the definition. In this paper, a procedure using an inverse filter of exponential time weighting is proposed to eliminate the time delay effect caused by the exponential time weighting. By this procedure, because the sampled sound levels are obtained as discreet values, some of the time-average sound pressure levels determined by this procedure may show negative infinitive decibels. A practical method for solve this problem is also proposed.View full abstractDownload PDF (876K) -
Katsumi Uesaka, Hirofumi Ohnishi, Tatsuo Miyake, Koichi Takagi1999 Volume 23 Issue 3 Pages 189-199
Published: June 01, 1999
Released on J-STAGE: October 06, 2009
JOURNAL FREE ACCESSThe revised environmental quality standards for noise have adopted LAeq as an evaluation index in place of L50 which has been used for a long time. The new standards divide the ‘areas facing roads’ into the ones adjacent to arterial roads and the others, and give different target values to each of them. Therefore calculating LAeq of road traffic noise at the positions behind a building becomes increasingly important. This paper presents simple methods for calculating sound pressure level at all the receivers behind a building of rectangular cross-section directly facing the arterial road. The methods which apply the Maekawa's chart to calculation of sound attenuation by a virtual thin barrier take account of both sound diffraction and reflection, meet the reciprocity and secure the continuity of calculated values in all the combinations of positions of sound sources and receivers. The sound pressure levels at the receivers are calculated by summing the contributions from the paths propagating over the top and the sides of the building. The validity of the methods presented here is verified by comparing the values by the methods with those calculated on a basis of wave acoustics and with those measured through model experiments.View full abstractDownload PDF (1538K)
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