Patent suggests audio sensors could be plugged into a computer or tablet . Sensors could detect vibrations to work out which ' button ' is being pressed . this could transform any flat surface into a full sized device . Google is one of many firms working to revolutionise physical computing .
Patent suggests audio sensors could be plugged into a phone or tablet . Sensors could detect vibrations to work out which 'key ' is being pressed . System would transform any flat surface into a full size keyboard . Google is one of many firms working to revolutionise physical hardware .