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Background noise can make speech in television and radio hard to listen to, and some people find music or atmospheric sound obstructive. For everyone with a hearing impairment, around one in six people in the UK, it's even more complex. Chris Vallance reports for Radio 4's PM on a group of universities who are working on a high tech solution. (Photo: A researcher from the University of Salford in their Listening Room Credit: University of Salford)