We use that language, but actually all you're talking about is a correlation [between physical quantities] and time can be removed completely.
我们用这样的语言描述它，但是事实上你们大多数在讨论物理量的相关性，所以时间可以被完全移除。
The correlation method and FFT method of the power spectrum estimation could not completely reflect the concept of the power spectrum of the non-stationary random signals because of data truncation.
对于非平稳随机信号的功率谱分析，采用自相关函数傅里叶变换和直接傅里叶变换分析时，由于存在数据截断，二者从概念上都不能很好地反映随机信号的功率谱。
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