Determining a reel motor angle using an estimated interval to degrees translation factor

A computer program product comprising a computer-readable storage medium storing a computer readable program, wherein the computer readable program when executed by a processor on a computer causes the computer to:

• calculate an estimate of an interval to degrees translation factor that represents a measurement angle interval divided by a first pulse count, wherein the first pulse count represents magnetic format transitions counted during an angular measurement interval, wherein a servo format is formed by the magnetic format transitions written on a tape medium, wherein the measurement angle interval is determined with a reference angle sensor;
• and
• determine a reel motor angle 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 magnetic 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.

A system, comprising:

• a processor;
• and
• an integrated circuit performing operations, the operations comprising:
• calculating an estimate of an interval to degrees translation factor that represents a angle interval divided by a first pulse count, wherein the first pulse count represents magnetic format transitions counted during an angular measurement interval, wherein a servo format is formed by the magnetic format transitions written on a tape medium, wherein the measurement angle interval is determined with a reference angle sensor;
• and
• determining a reel motor angle 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 magnetic 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.