Ruby Dunn
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New app for children who are unable to speak

4 July 2012 Last updated at 05:58 BST

New technology promises to give thousands of children who cannot speak a voice.

An app called Proloquo2Go allows six-year-old Ruby Dunn to tap on symbols on a tablet computer - and then have a sentence read out in a child's voice.

The software, which features the voices of two British children, is among a number of innovations now helping children with special needs.

Rory Cellan-Jones reports.