道路交通騒音の騒音レベルの時系列の解析と動的統計量に関する考察

抄録

The time series of sound levels of road traffic noises observed at the site in the vicinity of a road are analyzed with respect to the time pattern. The results obtained are follows:1)The probability that a given series of sound levels will happen, is presented by a joint function of the transition probability distributions as Markov chains. 2)The stochastic quantities which represent the dynamical properties of time series of sound levels are obtained. These are the average duration time in which a given sound level is successively observed, the average duration time of the state in which the sound levels are over or less than a given level L dB, and the average recurrence time of a given sound level.