Tracking touchpad touch input

A computing device, comprising:

• a capacitive touch sensing touchpad;
• a processor;
• and
• a memory storing instructions executable by the processor to:
• detect a plurality of contacts at a plurality of capacitive touch antennas of the touchpad over a plurality of frames of data, the plurality of contacts produced by an object contacting the touchpad;
• at each frame of the plurality of frames of data:
• determine a measured coordinate of the plurality of contacts;
• determine a current plurality of characteristics of the plurality of contacts;
• compare the current plurality of characteristics of the plurality of contacts of a current frame of data to a prior plurality of the characteristics of the contacts of at least an immediately prior frame of data;
• determine that at least one of the comparisons of the characteristics satisfies a corresponding threshold;
• based at least on determining that the at least one comparison of the characteristics satisfies a corresponding threshold, determine that a coordinate jump is detected between the current frame of data and the immediately prior frame of data;
• based at least on determining that the coordinate jump is detected:
• set a current frame intermediate coordinate value to an immediately prior frame intermediate coordinate value of the immediately prior frame;
• and
• apply a smoothing filter to the immediately prior frame intermediate coordinate value to generate a smoothed immediately prior frame intermediate coordinate value;
• and
• output the smoothed immediately prior frame intermediate coordinate value.

A computing device, comprising:

• a capacitive touch sensing touchpad;
• a processor;
• and
• a memory storing instructions executable by the processor to:
• detect a plurality of contacts at a plurality of capacitive touch antennas of the touchpad over a plurality of frames of data, the plurality of contacts produced by an object contacting the touchpad;
• at each frame of the plurality of frames of data:
• determine a center of mass coordinate of the plurality of contacts;
• determine a current plurality of characteristics of the plurality of contacts;
• compare the current plurality of characteristics of the plurality of contacts of a current frame of data to a prior plurality of the characteristics of the contacts of at least an immediately prior frame of data;
• determine that none of the comparisons of the characteristics satisfy a corresponding threshold;
• on condition of determining that none of the comparisons of the characteristics satisfy a corresponding threshold, determine that a coordinate jump is not detected between the current frame of data and the immediately prior frame of data;
• based at least on determining that the coordinate jump is not detected, perform jitter restriction on the center of mass coordinate minus an offset to generate a jitter restricted current frame intermediate coordinate value, wherein performing jitter restriction comprises:
• determining a track size of the plurality of contacts;
• and
• using the track size to select a selected jitter restrictor range from a plurality of jitter restrictor ranges;
• and
• output the jitter restricted current frame intermediate coordinate value.