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:
Aug. 07, 2018
Filed:
Feb. 14, 2018
Pixart Imaging Inc., Hsin-Chu County, TW;
Kevin Len-Li Lim, Penang, MY;
Zi-Hao Tan, Penang, MY;
PIXART IMAGING INC., Hsin-Chu County, TW;
Abstract
A clock calibration method of a navigation system is provided. The clock calibration method includes: entering a calibration mode; sequentially issuing, by a host, a count start signal and a count end signal separated by a time interval; counting a local oscillation frequency of a local oscillator when a navigation device receives the count start signal from the host; disabling the counting when the navigation device receives the count end signal from the host and generating a current count; generating a calibration signal according to the current count and a predetermined count corresponding to the time interval; and calibrating the local oscillation frequency of the local oscillator according to the calibration signal.