任意遮音システムの出力エネルギー分布に関する最小自乗法からの簡易的予測手法 : 白色打診入力下の時系列的同定と任意騒音入力下の分布予測

概要

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Most of the previous studies on the sound insulation system were introduced from the deterministic viewpoint in a frequency region. So these idealized studies with no finiteness of geometric scale seem to be too simple to adapt to the complicated situation of actual sound systems with random excitation. In this paper, especially paying our attention to the energy fluctuation in a time series model rather than the usual spectral density in a frequency region, a simplified identification method for an arbitrary sound insulation system and then a simple prediction method for the output probability distribution are proposed. Concretely, based on a preexperiment with a test input of white noise, the order of time series model and its parameters for system are identified by use of the well-known least square method. Next, by use of the result of this indentification, the probability distribution of output energy is predicted for the present system in an actual case when the noise input excitation of arbitrary distribution type passes through the system. Finally, the present method is applied to the room acoustical experiment in several types of actual cases containing double wall with sound-bridge. Thus, the effectiveness of our identification and prediction methods is experimentally confirmed.
社団法人日本音響学会の論文
1983-11-01