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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static double autocorrelation(double[] voiceSample) {
  int n = voiceSample.length;
  double sum = 0;
  for j to n: {
    double correlation = 0;
    for i to n:
      correlation += voiceSample[i] * voiceSample[mod(i - j, n)];
    sum += correlation;
  }
  ret doubleRatio(sum, n);
}