Then, the sampling rate alteration method based on FIR filter with FRM structure, its architecture, computational complexity and the problem in designing are studied.

并研究了基于此类FRM结构FIR滤波器的采样率变换算法、实现结构、计算复杂度及其设计问题等。

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LIMITATIONS: the fecal sampling method is standardized, but the sample size depends on fecal consistency.

局限性：粪便取样方法已经被标准化了，但是样本大小取决于粪便的稠度。

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Basing on these conditions, the method and the algorithm for acquiring optimal sampling frequencies is presented.

基于这些条件，文章给出了优化采样频率的求解方法和算法。

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However, the researchers said that despite a lower number of invasive tests, the heavier reliance of this method on chorionic villus sampling earlier in pregnancy could actually mean an increase in the number of healthy babies lost if the miscarriage rate using this method was closer to 2%.

BBC: Down's test miscarriage warning