biquad - Bi-quadratic filter, two poles and two zeroes.
Inputs:
in [BUFFER] [REQUIRED]: input buffer to be filtered.
a1 [BUFFER|FLOAT] [OPTIONAL]: first coefficient of denominator.
a2 [BUFFER|FLOAT] [OPTIONAL]: second coefficient of denominator.
b1 [BUFFER|FLOAT] [REQUIRED]: first coefficient of numerator.
b2 [BUFFER|FLOAT] [REQUIRED]: second coefficient of numerator.
f0 [BUFFER|FLOAT] [OPTIONAL]: resonance frequency.
r0 [BUFFER|FLOAT] [OPTIONAL]: resonance quality.
Outputs:
out [BUFFER]: output buffer.
Computes y[n] = x[n] + b1 * x[n - 1] + b2 * x[n - 2] - a1 * y[n - 1] - a2 * y[n - 2].
This lets the user design custom biquad filters, however for a more user-friendly biquad-based filter, see filter.