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Band-pass filter
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<p>A band-pass filter or bandpass filter (BPF) is a device that passes <a href="/facts/Frequency/QUSbPaW8">frequencies</a> within a certain range and rejects (<a href="/facts/Attenuate/XP4vX360">attenuates</a>) frequencies outside that range. It is the inverse of a <i><a href="/facts/Band-stop_filter/p0y8uUfS">band-stop filter</a></i>. </p>