看一篇外文文献，说的是有源滤波器，−3-dB frequency at 1 Hz是什么意思啊？下面是一整段话All the analogue signal conditioning paths concluded with a corresponding unity gain fourpole low pass filter, each with a −3-dB frequency at 1 Hz to minimize the noise and interference in our measurements.
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想问一下这两个二阶滤波器参数都是一样的，为什么第一个频率用C算，第二个用2C啊
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