A stochastic evaluation for non-stationary random noise over a long time period based on local stationarity and its application to actual acoustics environment

• Autorzy: Nishimura K. , Ohta M.
• Języki publikacji: EN

Abstrakty

EN

A non-stationary environmental noise fluctuations can be treated as some composition of local state strips having arbitrary fluctuating pattern in a locally stationary time period. Its non-stationary characteristics can be seen in the form of its changing stage from a locally stationary state to another one by means of its temporal change of probability distribution. For a non-stationarity with continuously slow temporal change, the noise evaluation method is derived by considering the temporal change of moment statistics or distribution parameters. On the other hand, for a non-stationarity with stepwise rapid variation like an ON/OFF operation of machine, the noise evaluation method is derived by considering in principle the occurring probability of each of locally stationary state based on the mutually exclusive property. In the experimental consideration, the above contrastive two evaluation methods have been applied to actual cases with slowly changing environmental noise and rapidly changing machine noise.

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2002
• Tom: Vol. 27, no. 3
• Strony: 175--189
• Opis fizyczny: Bibliogr. 14 poz., rys., tab., wykr.

Twórcy

autor

Nishimura K.

• Faculty of Engineering, Kinki University, 1 Umenobe, Takaya, Higashi-Hiroshima City, 739-2116 Japan

autor

Ohta M.

• Hiroshima University, 1106, Matoba 1-7-10, Minami-Ku, Hiroshima City, 732-0824 Japan

Bibliografia

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