Patent ID: 7724157
Filing Date: 2010-05-25
Classification: G06F,H03M

Abstract:
1. A data entry system operated by a user with two hands, comprising: a plurality of value keys operated by one hand of the user; a plurality of level keys operated by the user's other hand; each of the keys capable of being depressed and released; each of the value keys generating a distinct value code upon depression; each of the indexing level keys generating a distinct indexing code upon depression; wherein the sum of each of the value codes and each of the indexing codes is distinct from each such other sum and from each of the value codes and each of the indexing codes; a controller in electrical communication with the keys; wherein the controller generates output codes depending upon which value codes and indexing codes are generated by the depression of the keys within a first predetermined time interval having a range between upper and lower limits; and wherein each output code generated by the controller corresponds to a set of predetermined control, alphabetic or numeric characters.