When the noise measurement with grievance procedure is carried out, it is usually done on the boundary line of the site where the source of noise is located. There are rare cases of measurement conducted in the complainer's homes. For example, there is a case where the complainer's home and the establishment generating the noise are located in the same building. There is also a case where the measurement on the boundary line of the site is too difficult because of the very short distance between the source of noise and the complainer's home. In this survey 100 cases of which noise levels were measured by the local governments were obtained. These cases statistically analyzed on the relations between indoor noises and inhabitant's responses. The results obtained from our study are as follows: 1) The number of complaints was highest for indoor noise levels of 40-44dB(A) by Lmax, and this is equivalent to 35-39dB by LAeq. 2) The regulation levels at the boundary line set by each local government are adequate.
A questionnaire survey was given to foreigners living in Fukuoka City, Japan to identify and clarify the features of the Japanese soundscape. Due to the fact that foreigners have their own cultural background, they may recognize different soundscape from the Japanese. The respondents are foreign students in the universities in Fukuoka City. They are mainly Chinese, Korean, and other Asians. The foreigners were asked to point out the sounds which they often heard in Japan but rarely heard in their home countries and vice versa. Exhaust noises by wild bike riders (Bousouzoku in Japanese), aircraft noise, crow caws, audio traffic signals for the blind, and the chirping of cicadas are the typical sounds only heard in Japan. These sounds are heard in Japan during daily life. For foreigners, the Japanese soundscape is characterized by these sounds. These sounds are not necessarily stereotyped as Japanese-like sounds, such as temple bells or the Yamakasa festival. Car horns, human voices, and bicycle bells are the typical sounds less heard in Japan. The total impression of the acoustic environment among the respondents has been positive, despite the noisy Bousouzoku and aircraft.
For protection against hearing impairment, The Japan Society for Occupational Health specified the Permissible Criteria for Impulse Noise Exposure describing peak sound pressure level and duration of impulse noise. This report discussed the possibility to describe this criteria with measurements indicated on sound level meters which conformed to the new International Standard IEC 61672 (under preparation). Some tests were performed with electrical signals simulated as impulse noises. According to the test results, it appeared that the criteria can be described by maximum A-weighted sound pressure level or A-weighted sound exposure level for A-type impulse noise, and with a combination of peak C-weighted sound pressure level and C-weighted sound exposure level for B-type impulse noise.