By Daily Mail Reporter
Last
It's probably the only new gadget that teenage boys won't be desperate to get their hands on.
A 'porn filter' which recognises the sound of sex and prevents lewd footage appearing on computers has been developed by scientists.
It's a large step-up from existing image-analysis systems which struggle to distinguish between indecent imagery and innocent pictures with large flesh-coloured regions, such as a close-up face, according to the New Scientist.
The electrical engineers at the Korea Advanced Institute of Science and Technology analysed a variety of audio clips while developing their technology.
They found that while everyday speech had a wide range of pitches, and changed gradually, pornographic sounds were higher-pitched and repetitive.
And in tests, the new filter was able to correctly identify the porn 
The seven per cent of footage it mislabelled contained confusable sounds, such as background music, or loud audience cheers.
Richard Harvey, a computer scientist at the University of East Anglia, described the technology as 'quite ingenious', but suggested it would be best to combine the audio filter with existing image-based ones.
He said: 'Think of that scene in When Harry Met Sally (in which Meg Ryan fakes an orgasm while sitting in a diner).
'The audio is very clearly pointing in one direction, but the video is not.'
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