Sigard by Sound Intelligence is a patented software/closed circuit television system security package that can detect verbal aggression from individuals in wired public spaces, public transportation, prisons, nightclubs and bars. The technology is able to detect distinct sound patterns with a level of effectiveness similar to the human hearing. And yes Sigard is currently installed and in use. However, Sigard does not record conversations. It does not listen to what you saying. Sigard listens to how you say whatever it is you are saying. And it listens for changes in the human voice that happen in an aggressive situation.
[Source: About.com]
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