US 9,811,214 B2
Fast multi-touch noise reduction
Clifton Forlines, Newton, MA (US); Darren Leigh, Round Hill, VA (US); Daniel Wigdor, Toronto (CA); and Steven Leonard Sanders, New York, NY (US)
Assigned to Tactual Labs Co., New York, NY (US)
Filed by Tactual Labs Co., New York, NY (US)
Filed on Mar. 17, 2014, as Appl. No. 14/216,791.
Application 14/216,791 is a continuation in part of application No. 13/841,436, filed on Mar. 15, 2013, granted, now 9,019,224.
Application 13/841,436 is a continuation in part of application No. 14/069,609, filed on Nov. 1, 2013, granted, now 9,158,411.
Claims priority of provisional application 61/798,828, filed on Mar. 15, 2013.
Claims priority of provisional application 61/930,159, filed on Jan. 22, 2014.
Claims priority of provisional application 61/845,892, filed on Jul. 12, 2013.
Prior Publication US 2014/0340351 A1, Nov. 20, 2014
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/044 (2013.01) [G06F 3/0416 (2013.01); G06F 2203/04104 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for determining a location of a touch event on a touch sensitive device, the touch sensitive device comprising a plurality of row conductors and a plurality of column conductors, the path of each of the row conductors crossing the path of each of the column conductors, the method comprising:
a. simultaneously transmitting a unique frequency orthogonal row signal on each of the row conductors in the plurality of row conductors, each of the unique frequency orthogonal row signals being frequency orthogonal to each other of the unique frequency orthogonal row signals;
b. detecting an amount of each of the simultaneously transmitted unique frequency orthogonal row signals present on each of the plurality of column conductors;
c. simultaneously transmitting a unique frequency orthogonal column signal on each of the column conductors in the plurality of column conductors, each of the unique frequency orthogonal column signals being frequency orthogonal to each other of the unique frequency orthogonal column signals;
d. detecting an amount of each of the simultaneously transmitted unique frequency orthogonal column signals present on each of the plurality of row conductors;
e. determining a location of a touch event on the touch sensitive device using the detected amount of each of simultaneously transmitted unique frequency orthogonal row signals and the detected amount of each of the simultaneously transmitted unique frequency orthogonal column signals, wherein the location of the touch event is determined to be at or near an intersection of a row conductor and a column conductor when a detected amount of a simultaneously transmitted unique frequency orthogonal row signal associated with the row conductor is at a level corresponding to a touch event on the column conductor and the detected amount of a simultaneously transmitted unique frequency orthogonal column signal associated with the column conductor is at a level corresponding to a touch event on the row conductor.