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[With apologies -- no, it's not cryptography.]
Considering the wide variety of gun noises and urban noise artifacts, a lot of false alarms would be expected. On the other hand some of them might be worth responding to from the police perspective. It might be preferable to respond to firecrackers early in the evening and discourage accidental or deliberate arson later.
The original report on CNN said that LLNL claimed their system didn't use sound for tracking. They wouldn't discuss further details, since the system hasn't been patented yet. Sci.military readers might remember that a debate about these types of acoustic locating systems took place there a couple of months ago. Apparently the UK has a vehicle-mounted system that they use to sniff out snipers in Northern Ireland. - -Paul - -- Paul Robichaux, KD4JZG | Out the 10Base-T port, through the router, perobich@ingr.com | over the leased line, off the bridge, past Intergraph Federal Systems | the firewall... nothing but net. Of course I don't speak for Intergraph. -----BEGIN PGP SIGNATURE----- Version: 2.5 iQCVAgUBLetVOafb4pLe9tolAQFOUAQAmG0clN+Zy0QolI82XENnwNShR12DInCF b98VLy6/a0U254/lGw9OBDKikFUZqxZ3F4XeIkUmrVmzAMZY0x5PpBRAN25a2g+J Jxs8vcoEpIz7uwBMpIXQUnrIdW22AtIxJSW53d6bZTgUASGA+upJBatPnMqYPz1y iJzmsFl5MJw= =qmyo -----END PGP SIGNATURE-----