"Who" in the World would record that
annoying 50Hz Hum???
The hum that helps to fight crime
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For the last seven years, at the Metropolitan Police forensic lab in south London, audio specialists have been continuously recording the sound of mains electricity.It is an all pervasive hum that we normally cannot hear. But boost it a little, and a metallic and not very pleasant buzz fills the air.
"The power is sent out over the national grid to factories, shops and of course our homes. Normally this frequency, known as the mains frequency, is about 50Hz," explains Dr Alan Cooper, a senior digital forensic practitioner at the Met Police.
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From: http://www.bbc.co.uk
TinyURL: http://tinyurl.com/ccsal9y
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Rebecca Morelle looks at forensic audio and
phonetics on Frontiers on Wednesday 12
December 2100 GMT on Radio 4
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It's like something Right Out of CBS's Hit Show:
Person of Interest....
Wingman.
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