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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文章没有说的太具体，只是给了这样一个四阶低通滤波器，对这个进行了说明（就是我问题中发的那句话）
麻烦您啦~
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