3
级联双二阶部分以实现高阶滤波器的工作原理?
我正在尝试实现8阶IIR滤波器,并且我阅读的每个应用笔记和教科书都说,最好将2阶以上的任何滤波器实现为二阶部分。我tf2sos在MATLAB中使用了二阶部分的系数,这与我预期的4个二阶部分的6x4系数有关。在实施为SOS之前,八阶滤波器需要存储7个先前的采样值(以及输出值)。现在,当实现为二阶部分时,流程如何从输入到输出工作,我是否仅需要存储2个先前的样本值?还是第一个滤波器的输出馈x_in入第二个滤波器,依此类推?
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