* return in usecs the elapsed timebetween now and the reference x as
* returned by xip_currtime().
*
- * note 1: convertion to usec can be approximated, as long as the
+ * note 1: conversion to usec can be approximated, as long as the
* returned value is <= the real elapsed time.
* note 2: this should be able to cope with a few seconds without
* overflowing.