Function butterworth

butterworth(
    kind: "highpass" | "lowpass",
    cutoffHz: number,
    fs: number,
): BiquadCoefficients
2nd-order Butterworth coefficients by the bilinear transform with prewarping (the audio-EQ cookbook formulas with Q = 1/√2).
Parameters
- kind: "highpass" | "lowpass"
  highpass or lowpass.
- cutoffHz: number
  −3 dB frequency, Hz.
- fs: number
  Sample rate, Hz.
Returns BiquadCoefficients
- Defined in filters.ts:166