Patent ID: 8350733
Filing Date: 2013-01-08
Classification: G06F

Abstract:
1. A method of identifying which of at least one of a plurality of keys in a keyboard has been actuated, wherein actuation of each of the keys electrically couples one of a plurality of first lines and one of a plurality of second lines, the method comprising: applying a first signal to a plurality of first lines; applying a second signal to a plurality of second lines; upon identifying at least one of the second lines as presenting a signal different from the second signal, applying a scan signal to the identified second line; identifying at least one first line presenting a signal indicating the at least one first line is in contact with the identified second line applying the scan signal, whereby at least one of the plurality of keys is identifiable as causing the identified second line and the least one identified first line to be coupled; and identifying a key masking situation, including: determining if more than one of the first lines presents a signal indicating contact with the identified second line applying the scan signal; and when more than one of the first lines presents a signal indicating contact with the identified second line applying the scan signal, determining whether the plurality of identified second lines differs from a stored list of identified second lines.