![]() The slope of filter attenuation is usually quantified in decibels per octave. A low-pass filter (LPF) attenuates content above a cutoff frequency, allowing lower frequencies to pass through the filter. A high-pass filter (HPF) attenuates content below a cutoff frequency, allowing higher frequencies to pass through the filter. There are two types of pass filters (Fig. ![]() ![]() An audio pass filter attenuates an entire range of frequencies.
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