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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纠正：
昨天公式凭印象，分子不是1，是1.41，应该用附件公式，是从网上下载。
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