发明授权
- 专利标题: Data timestamp management
- 专利标题(中): 数据时间戳管理
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申请号: US11821810申请日: 2007-06-25
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公开(公告)号: US07937232B1公开(公告)日: 2011-05-03
- 发明人: Paxton Ming Kai Chow , Vera Alexandrova Snowball , Barton George Lane, III , Sophia Leonidovna Shtilman , Chalee Asavathiratham , Abhijit Majumdar , Sherk Chung , Yi Wang , Paul Tran
- 申请人: Paxton Ming Kai Chow , Vera Alexandrova Snowball , Barton George Lane, III , Sophia Leonidovna Shtilman , Chalee Asavathiratham , Abhijit Majumdar , Sherk Chung , Yi Wang , Paul Tran
- 申请人地址: US CA Pleasanton
- 专利权人: Pivotal Systems Corporation
- 当前专利权人: Pivotal Systems Corporation
- 当前专利权人地址: US CA Pleasanton
- 代理机构: Kilpatrick Townsend & Stockton LLP
- 主分类号: G01R29/02
- IPC分类号: G01R29/02
摘要:
Embodiments of the present invention relate to managing timestamps associated with received data. According to one embodiment, data is collected from a device that generates data at a specified rate, but which lacks a built-in clock. An accurate timestamp is assigned to the data by first taking an absolute timestamp from a reference clock, and then adding a calculated amount of time to each subsequent data point based on an estimate of the sampling frequency of the device. As the generated timestamp drifts from the actual reference clock time, the sampling frequency is re-estimated based on the amount of detected drift.