WAVE COMPOSITION FROM WIGNER DISTRIBUTION USING WAVELETS

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  • HONDA Riki
    社団法人 土木学会 京都大学防災研究所
  • OHAMA Yoshinori
    社団法人 土木学会 京都大学大学院工学研究科

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  • ウェーブレットを用いた Wigner 分布からの波形合成法
  • ウェーブレット オ モチイタ Wigner ブンプ カラ ノ ハケイ ゴウセイホウ

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Abstract

Wigner distribution is a useful tool to detect the time varying frequency characteristics of the signal, and it has many advantages. There is also a problem, however, that generally Wigner distribution can not be converted to the time series signal. This paper proposes a method to compose a time series signal from an arbitrary Wigner distribution by using the orthnormal wavelet functions. By using the proposed method, a strong motion record is divided into the body wave component and surface wave component based on its time-frequency characteristics represented by Wigner distribution. The computation results verify the applicability of the proposed method.

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