chase.alg

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

(CHASE-ALG
  (NAME "chase")
  (ARGUMENTS ("sound_type" "input") ("double" "risetime") ("double" "falltime")) 
  (STATE ("double" "level" "0.0")
         ("double" "upslope" "1.0/(input->sr * risetime)")
         ("double" "downslope" "1.0/(input->sr * falltime)"))
  (START (MIN input))
  (INNER-LOOP "	double x = input;
        if (x > level) {
            level += upslope;
            if (x < level) level = x;
        } else {
            level -= downslope;
            if (x > level) level = x;
        }
        output = (sample_type) level;")
  (TERMINATE (MIN input))
  (LOGICAL-STOP (MIN input))
)