# This shows how to create a lowpass biquad filter using the IIR filter type
# The result should be equivalent to the command
# Filter: ON LP Fc 3000 Hz

Eval: freq = 3000
Eval: Q = 1/sqrt(2)
Eval: omega = 2 * pi * freq / sampleRate
Eval: sn = sin(omega)
Eval: cs = cos(omega)
Eval: alpha = sin(omega) / (2 * Q)
Eval: a0 = (1 - cs) / 2
Eval: a1 = 1 - cs
Eval: a2 = (1 - cs) / 2
Eval: b0 = 1 + alpha
Eval: b1 = -2 * cs
Eval: b2 = 1 - alpha

Filter: ON IIR Order 2 Coefficients `a0` `a1` `a2` `b0` `b1` `b2`