On Monday, June 2, 2014 12:16:28 PM UTC-4, haitic...@gmail.com wrote:   
   > On Sunday, June 1, 2014 11:21:24 AM UTC-4, gghe...@gmail.com wrote:   
   >   
      
   >   
   > Interesting. George I was thinking in general of "hidden signals." My thing   
   is   
   > non invasive medical diagnostics. (among other things.) So you postulate   
   there   
   > is a signal in a sensor input from a patient that is buried in other signals.   
      
   Hi JB,  Sorry, "hidden signals" or "other signals" is just too vague.   
      
   If the other signals are correlated between the two channels,   
   (say big AC 60Hz pickup.) Then it's possible to measure the   
   "other signals" on one channel and subtract.   
   However if the "other signals" are random noise...   
   you're stuck.   
      
   George H.   
      
   > If you look at an NIR spectrum, for example, reflected from a person's skin,   
   > you speculate there's a pony in that mess. :)   
   >   
   > jb   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)