Patent ID: 6681192
Filing Date: 2004-01-20
Classification: G06F

Abstract:
A method for using a first clock to calibrate a second clock, comprising:taking a series of measurement pairs, each measurement pair including a first clock measurement and a second clock measurement, the series of measurement pairs including an initial measurement pair, a final measurement pair taken at a later time than the initial measurement pair, and at least one intermediate measurement pair taken at a later time than the initial measurement pair and at an earlier time than the final measurement pair; for each measurement pair, determining a lower bound that indicates a minimum possible number of clock cycles that can occur on the second clock relative to one or more clock cycles that occur on the first clock; for each measurement pair, determining an upper bound that indicates a maximum possible number of clock cycles that can occur on the second clock relative to one or more clock cycles that occur on the first clock; and using the lower bound and the upper bound to determine a calibration variable that indicates a number of second clock cycles that occur during one or more first clock cycles.