Abstract
Survey of personal noise exposure due to the activities in the daily lives of 211 subjects was done. The average noise exposure pattern through 24 hours consists of fort main parts- the active daytime corresponding to a high flat level, the hours of sleep corresponding to a low flat level, the time from getting up to going to workplaces in the morning when the level rises up rapidly, and the time staying at home from evening to night until sleep when the level falls down gradually. The difference of properties of noise exposure patterns on occupations is also discussed. The maximum level of personal noise exposure pattern in a day is usually appeared in the activities such as working and commuting for workers, and is appeared mainly in the activities such as shopping, cleaning and social associations for housewives. And the maximum level is highly correlative with L_<eq24>. Then noise exposure in a day is shown to be dominant for time interval about five to seven hours in which L_<eq1/6> ' L_<eq24>. As a measure of uniformity of noise exposure in a day, the entropy of noise exposure pattern is defined and its properties are discussed.
