Patent ID: 8847920

Claim:
An apparatus comprising: timing circuitry that initiates a timing window in response to input sensed by an optical sensor that comprises a dominant status wherein the timing circuitry comprises circuitry that times a duration of the input sensed by the optical sensor; reset circuitry that resets the timing circuitry in response to a reset trigger wherein the reset allows for re-initiation of the timing window and wherein the reset trigger comprises a trigger based on an amount of received input sensed by the optical sensor after expiration of the timing window; association circuitry that associates the input with additional input sensed by a different optical sensor if the additional input commences during the timing window wherein the different optical sensor comprises a nondominant status; and filter circuitry that filters out additional input sensed by the different optical sensor if the additional input commences after expiration of the timing window and prior to a subsequent initiation of the timing window.