get set ambient

hello all,
what is getambient setambient metots?


  int dtd(REAL d, REAL x);

  REAL nlms_pw(REAL mic, REAL spk, int update);

/  int AEC::doAEC(int d, int x);

  float AEC::getambient() {
    return s0avg;
  void AEC::setambient(float Min_xf) {
    dotp_xf_xf = Min_dotp_xf_xf = NLMS_LEN * Min_xf * Min_xf;

what is used for??
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