Specifications

CARROLL TOUCH Appendix D - CTKERN Function Reference
Touch System Programmer’s Guide D-35
absolute time = Trunc (specified filter time / 55) * 55
For example, if you specify a time of 50, the time value used is actually
set to 0. If you specified a value of 100, the time value is 55. If you
specified a value of 500, the time value is 495. The filter time resolution
is 55 ms, which means that the actual amount of time that is required to
trigger a touch may vary from the actual filter time by +/- 55 ms.
Normally, the time value is set to a value large enough so that entry and
exit coordinate transients resulting from the stylus not entering/leaving
straight into/out of the screen are eliminated, but small enough so that
the delay time is not noticeable. The typical range of values to achieve
this is 100ms through 500ms.