For integer ratio conversion, the filters would be time-invariant, but for fractional ratio conversion, the filters would be time-variant whose structure is more complex.
实现整数倍采样率转换可以采用时不变滤波器，然而实现分数倍采样率转换一般需要采用较复杂的时变滤波器。
Variant term risk premium with time is very important influence factor in term structure.
投资者所要求的随时间变化的期限风险溢价才是影响期限结构的重要因素。
A methodology to assess the time-variant reliability of the primary ship structure with hull girder degradation of corrosion is analyzed.
分析一种船体腐蚀影响下随时间变化的船体结构可靠性计算方法。
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