BaseAudioContext: createWaveShaper() メソッド

createWaveShaper()

const audioCtx = new AudioContext();
const distortion = audioCtx.createWaveShaper();
// …
function makeDistortionCurve(amount) {
  const k = typeof amount === "number" ? amount : 50;
  const n_samples = 44100;
  const curve = new Float32Array(n_samples);
  const deg = Math.PI / 180;
  for (let i = 0; i < n_samples; i++) {
    const x = (i * 2) / n_samples - 1;
    curve[i] = ((3 + k) * x * 20 * deg) / (Math.PI + k * Math.abs(x));
  }
  return curve;
}
// …
distortion.curve = makeDistortionCurve(400);
distortion.oversample = "4x";