[sdiy] Handy DIY tip #213/noise color

[John L Marshall]

That is exactly how CDMA works, but using Walsh codes.


Take care,
John
---------------------------------------------------------------------------

----- Original Message ----- 
From: "Tim Ressel" <madhun2001 at yahoo.com>
> Once upon a time we built a DTMF detector that would
> decode tones that were buried 10 dB below the noise
> floor. It turns out that if you know what it is you're
> trying to detect, its not that hard to find it. Its
> kinda like holding a template up to the noise and when
> the signal shows up it shines through the template.