DISTINGUISHING VIBRATION SIGNALS FROM INTERFERENCE IN VIBRATION SENSING TOUCH INPUT DEVICES
Application 1342/CHENP/2007 published 2007-09-28, filed 2007-04-02
The present invention discloses systems and methods for use with vibration sensing touch input devices that distinguish signals derived from vibrations on a touch plate due to a touch input from signals derives from electromagnetic interference. In the present invention, the phase response of the signals due to electromagnetic interference can be inverted relative to the phase response of the signals due to vibrations in at least one signal transmission channel so that pair wise cross-correlation of the various signal channels reveals the signals caused by electromagnetic interference. Once electromagnetic interference is identified, it can be ignored or otherwise appropriately taken into account by the system
Applicant
1)3M INNOVATIVE PROPERTIES COMPANY
:3M Center, Post Office Box 33427, Saint Paul, Minnesota 55133-3427 U.S.A.
Inventor
1)SULLIVAN, Darius, M
International Info
Classification: G06F 3/043
Publication Number: WO/2006/039031
Application Date: 2005-08-29
Priority Information
10/957,234 U.S.A. 2004-10-01