Extract . . .
On CCTV, no-one can hear you scream. But technology from a UK company now means cameras can tell if you're being aggressive or calling for help - and will alert security guards straight away. Cambridge firm Audio Analytic has produced software which it said can analyse the pitch, tone and intonation of noises and work out if they pose a threat.
Read more here
http://www.bbc.co.uk/news/technology-11654139
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