Abstract: Apparatus and methods to reduce effects of erratic motion input during operation of an instrument via a graphical user interface are described. Spatial motion input received from a user may be filtered using filter parameters obtained during a calibration procedure. The filtered motion input may be used to predict a trajectory of a cursor or object used to select an icon or text. The icon or text may be latched to the approaching cursor or object. The combination of motion smoothing and latching may improve ease-of-use of the graphical user interface for individuals having neuromuscular disorder, or users operating instruments in high-vibration environments.

Abstract: Disclosed herein are a method of computing an estimated SOC and a battery state of charge (SOC) monitor. An embodiment method for computing an estimated SOC includes periodically measuring a present battery current and a present battery voltage. A hysteresis compensation value is then computed based on a previous SOC, the present battery current, and the present battery voltage when a change in battery current exceeds a threshold. The estimated SOC is then determined based on the hysteresis compensation value and a baseline SOC determined based on the present battery voltage and the present battery current.