Determining a reel motor angle using an estimated interval to degrees translation factor
US7684141B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Feb 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/463
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided are techniques for determining a reel motor angle. An estimate of an interval to degrees translation factor that represents a measurement angle interval divided by a first pulse count is calculated, wherein the first pulse count represents format transitions counted during an angular measurement interval. A reel motor angle is determined using the estimate by: receiving an indication that a rotating reference point has crossed a stationary reference point, wherein the indication is recognized as indicating that an angle between a motor rotor and a motor stator is a reference angle; determining a second pulse count, wherein the second pulse count represents format transitions counted since the indication was received to a given point in time; and at the given point in time, multiplying the second pulse count by the estimate to generate a first value and adding the reference angle to the first value to generate the reel motor angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.