“smoothed spectral density”的概念、定义、翻译、参考文献-科学参考

单词	smoothed spectral density
释义	smoothed spectral density Encyclopedia 理学时间序列释 smoothed spectral density平滑谱密度一种密度估计，基本思想是多数谱密度在小频率区间上变化不大，因此在小频率区间上对样本谱密度的值取平均，以达到降低变动性的目的。
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