Compression of servo control logging entries
US7676282B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2005 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Oct 27, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/584
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In controlled mechanical hardware, such as servo-controlled hardware, data from the control algorithm is obtained and logged for possible later analysis. Loss-less compression is provided without increasing the size of the storage memory. Instead of continuously storing the complete (absolute) value of a monitored control parameter, an absolute value is stored in an absolute entry and one or more values of the parameter which are relative to each preceding value are stored in a sequence of associated relative entries. The space required to store a relative value is less than the space required to store an absolute value. Updated absolute values and groups of associated relative values may also be recorded periodically or when a relative value is too large for the allotted space. The size of relative values may be variable and appropriate information data entries may be generated to indicate the size of associated relative entries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.