Archives of Acoustics, 26, 4, pp. , 2001

Some noise cancellation and prediction methods on the response probability distribution form for complicated sound wall systems with background noise

M. Ohta
Emeritus Professor of Hiroshima University

N. Takaki
Department of Electronics Eng., Faculty of Eng., Hiroshima Kokusai Gakuin University

In the actual situation of measuring an environmental
noise, it is very often that only the resultant stochastic fluctuation
contaminated by an additional noise of arbitrary distribution type can be
observed. In this paper at first a noise cancellation for reasonably removing
the effect of the above additional noise, especially in a whole probability
distribution form, is derived theoretically in order to estimate only the
undisturbed objective output response. Next, for the purpose of predicting a
whole expression form of the output response probability of an acoustic system
excited by an arbitrary stochastic input with the additional noise, a new
stochastic signal processing method, reflecting the effect of the additional
noise fluctuation, is proposed in a whole probability distribution form. The
effectiveness of the proposed theoretical methods is experimentally confirmed
too by applying them to the actual data measured in the complicated sound wall
systems.
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