Electrodes are attached to the neck and face to detect the movements that occur as the person silently mouths words and phrases.
Using this data, a computer can work out the sounds being formed and then build these sounds up into words.
The system is then able to translate the words into another language which is read out by a synthetic voice.
The team currently has two prototypes: one that can translate Chinese into English and another that can translate English into Spanish or German.
If the prototypes used a small vocabulary of about 100-200 words they worked with about 80% accuracy.
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