Silence Finder Algorithm/Technique

Hi everybody,

I’m a researcher and I’m very surprised using the silence finder function of Aldacity in some of my experiments.
However, I really need to know what techinque/algorithm the source code autor use.
I only find, inside source code, comments saying that the Silence Finder script was written by Alex S. Brown.
But I look for this script in his site ( and I don’t find it. Could anyone helpe me to know more about the silence finder technique/algorithm?

The algorithm is extremely simple - look for where periods of “silence” (amplitude below the threshold) become periods of non-silence (amplitude above the threshold), then mark it with a label.
How much detail do you want?
Do you know anything about Nyquist programming or Lisp?
(Nyquist: )