An apparatus comprises an input keypad having a plurality of keys. The input keypad outputs an output signal that is indicative of either a single depressed key or a plurality of depressed keys. The apparatus includes a processor for receiving the output signal by the input keypad and associating an...http://www.google.fr/patents/US7265745?utm_source=gb-gplus-shareBrevet US7265745 - Compact alphanumeric keyboard
