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Sample rate (Hz)
Fc (Hz)
Q
Gain (dB)
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Something useful: a biquad filter coefficient calculator. Set the filter Type, the Sample rate (or 1.0 for “normalized” frequency), and cutoff of center frequency Fc. You can adjust Q for lowpass, highpass, bandpass, notch, and peak filters (use 0.7071–which is 1 divided by the square root of 2–for Butterworth lowpass and highpass), and Gain for peak and shelving filters. View the frequency response with a linear or log scale. You can copy and past the resulting coefficients into your programs.