The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2004
Filed:
Sep. 24, 2001
Joseph Cox Ballantyne, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Systems and methods for efficiently and accurately determining a speed of a faster clock having unknown frequency using a slower clock having a known frequency. A series of measurement pairs are taken from the clocks; each measurement pair including one measurement from the slower clock and one measurement—at the same time—from the faster clock. A lower bound and an upper bound for the measurement pairs are determined. The lower bound and the upper bound are averaged to derive a calibration variable that indicates a number of clock cycles that occur on the faster clock during one cycle of the slower clock. The calibration variable is used to time various processes in a computer system.