View Single Post
Old 9th May 2011, 19:47
  #1016 (permalink)  
Machinbird
 
Join Date: Jul 2009
Location: Not far from a big Lake
Age: 77
Posts: 1,458
RR_NDB
You have a signal that could be IMPOSSIBLE to be heard and with proper techniques can be CLEARLY detectable in the computer screen (High Signal to Noise ratio) using widely available FREE software PC (Win) compatible.
I believe the technique you are referring to is a phase lock loop system.
Phase-locked loop - Wikipedia, the free encyclopedia
Real electronic black magic. No doubt the EE folk will have more to say.
Machinbird is offline