Re: Detect and Match Sound?

["Jeff Blakeney" <jeff.blakeney@a2central.com.remove-105-this>]

  To: aiiadict
On Wed, 18 Feb 2009 09:16:13 -0800, aiiadict wrote:

> But I don't think using any kind of sound recognition is the best way
> to detect broken glass.  Criss-cross the window with very thin copper
> wire (very hard to see).  Super glue it at the corners and middle.

I remember servicing a security system during one of my co-op work terms
during college and that is the type of thing they had on their windows.
A .5" wide strip of silver foil (not unlike tin foil) an inch or two
inisde the edges of the window to make a circuit.  If the window broke,
the foil would most likely be broken and the normally closed "switch" of
the foil would be opened signalling the broken window.