ng is source spectrum generation procedure.</p>
  <pre><code>for index in [1, numberOfHarmonics] {
    if (index % interval != 0) continue;
    sourceSpectrum[index].amp = 1 / (denominatorSlope * index);
    sourceSpectrum[index].phase = rotationOffset + rotationSlope * index;
}</code></pre>
  </dd>
  <dt>Harmonic HP</dt>
  <dd>
  <p>Frequency index of highpass filter which applies to source spectrum
  amplitude.</p>
  <p>Amplitude of frequency, which index is below the
  <code>Harmonic HP</code>, will be r