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By Dave Lee BBC World Service
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.
"A lot of incidents just can't be picked up by video only systems," said Chris Mitchell, Audio Analytic's boss, on BBC World Service's Digital Planet.
"For example in a hospital where somebody, or a nurse, is being threatened early hours in the morning - that's a very difficult thing for CCTV guards who monitor hundreds of channels worth of video signals on 20 screens or so to pick up."
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This is a clear benefit from advances in technology. Any device which can distinguish trouble from normal sounds has to be a step forward. It should not only save people from harm, but reduce the fear of attack by patients or strangers in many cases.
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