Filter response may be characterized or parameterized by some of the following features:
- Passband: range of frequencies unaffected (passed) by the filter
- Stopband: range of frequencies affected or attenuated (stopped) by the filter
- Cutoff Frequency: frequency at which a filter begins to act, usually where the attenuation hits -3dB or a linear scale level of 0.707
- Slope: describes how rapidly attenuation changes over frequency, also called rolloff
- Transition Band: range of frequencies between the passband and stopband
- Passband Gain: the amplitude of the passband
- Quality Factor: a way to specify the bandwidth of a resonance
- Center Frequency: specifies the center frequency of a resonance
- Filter Order: related to the computational complexity of a filter, higher orders can achieve steeper rolloff
The web-based Interactive Biquad Calculator
plots the frequency response of various filter types and allows variation of filter parameters.
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