instantaneous spectrum

Though there are several methods available for instantaneous spectrum estimation, the contradiction between precision and resolution is not yet reconciled, and the modeling of instantaneous spectrum is even more rarely studied.

虽然已有不少信号处理方法被用于地震动的瞬时谱估计，但一直未能解决好精度和分辨率的矛盾，而在此基础上的地震动瞬时谱的模型化研究则更是空白。

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After processed by narrow band com-plex filtering or narrow band recurrence filtering and Hilbert trans-formation, real signal is transformed into narrow band complex sig-nal, whose instantaneous spectrum is then used to solve for tensor impedance element.

本文通过对记录上的实信号做窄带复数滤波或窄带递归滤波和希尔伯特变换，转换成窄带复信号，再由复信号的瞬时谱求出张量阻抗元素。

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