Dynamic assignment of possible channels in a touch sensor

Abstract

Methods are disclosed for dynamic assignment of possible channels in a touch sensitive device having rows and columns. In an embodiment, a method determines a first signal space in which to generate signals for use in the touch sensor. Signals are then generated in the first signal space on separate ones of the rows and a column signal is sensed on a column. The first signal space is replaced with a second signal space, and a second plurality of signals is generated for use in the touch sensor in the second frequency space. The second plurality of signals is sensed to identify a touch event in the touch sensitive device.

1 . A method for reducing the effect of noise in a device having first and second conductors, wherein the device senses events through processing signals present on the second conductors, comprising:
 selecting a frequency space in which to generate a plurality of signals for use in a sensor;   generating a plurality of signals for use in the sensor in the frequency space, each of the plurality of signals being generated such that there are at least two different signals present on each of a plurality of first conductors;   sensing presence and level of the plurality signals on at least one of a plurality of second conductors; and   identifying a signal based on a determination that the signals present on the at least one of the plurality of second conductors corresponds to the plurality of the signals generated on at least one of the plurality of first conductors.   
     
     
         2 . The method of  claim 1 , wherein the determination comprises a determination that a majority of signals present on the at least one of the plurality of second conductors corresponds to the plurality of the signals generated on at least one of the plurality of first conductors. 
     
     
         3 . The method of  claim 1 , wherein the determination comprises a determination that all of the signals present on the at least one of the plurality of second conductors correspond to the plurality of the signals generated on at least one of the plurality of first conductors. 
     
     
         4 . A method for reducing the effect of noise in a device having first conductors and second conductor, wherein the device senses events through processing signals present on the first conductors and the second conductors, comprising:
 selecting a frequency space in which to generate a plurality of signals;   generating the plurality of signals for use in the frequency space, each of the plurality of signals being generated on separate ones of the first conductors and the second conductors;   sensing presence and level of the plurality of signals on at least one of the first conductors and at least one of the second conductors; and   identifying a touch signal when a signal present on the at least one of the second conductors corresponds to at least one of the plurality of signals generated on the first conductors and a signal present on the at least one of the first conductors corresponds to at least one of the signals generated on the second conductors.   
     
     
         5 . A method for reducing the effect of noise in a device having first and second conductors, wherein the device senses events through processing signals present on the second conductors, comprising:
 selecting a frequency space in which to generate a plurality of signals for use in a sensor;   generating a plurality of signals for use in the sensor in the frequency space, each of the plurality of signals being generated such that there are at least two different signals present on each of a first conductor;   sensing presence and level of the plurality signals on at least one of a plurality of second conductors; and   identifying a signal based on a determination that the signals present on the at least one of the plurality of second conductors corresponds to the plurality of the signals generated on at least one of the first conductor.   
     
     
         6 . The method of  claim 5 , wherein the determination comprises a determination that a majority of signals present on the at least one of the plurality of second conductors corresponds to the plurality of the signals generated on the first conductors. 
     
     
         7 . The method of  claim 5 , wherein the determination comprises a determination that all of the signals present on the at least one of the plurality of second conductors correspond to the plurality of the signals generated on the first conductor.