Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for real-time filtering of a position error signal for a disk drive servo system










Image Number 6 for United States Patent #5995317.

A method and apparatus for real-time filtering of a position error signal in a servo system of a disk drive. Pre-calculated periodic components of the position error signal (PES) are used as future values in a real-time filter, preferably a real-time recursive median filter. This minimizes the amount of time-lag between obtaining the raw PES measurement from the disk surface and the providing the corresponding filtered PES output. This reduced time-lag minimizes the effect on the phase margin (PM) and results in improved servo stability. The invention can be used not only in servo systems in disk drives, but also in servo systems of other mechanical moving storage devices and in servo systems of rotating mechanical machinery in general, where the signal to be filtered may be a position error, velocity error, acceleration error, and the like.








 
 
  Recently Added Patents
Mirror elements for EUV lithography and production methods therefor
Exposure method, exposure apparatus, and method for producing device
Phosphoinositide 3-kinase inhibitor with a zinc binding moiety
Monitoring and correcting upstream packet loss
Cooling structure for electronic device
Processing data using information embedded in a data request
Light-emitting device package and method of manufacturing the same
  Randomly Featured Patents
Carbohydrate glass matrix for the sustained release of a therapeutic agent
Golf shoes
Method and apparatus for assisting left-handed manipulation of a vehicle ignition switch
Temperature compensation quartz oscillator
Non-metallic door edge guard having different appearances of each side
Sign stand for mounting flexible sign panels
Adjustable stand for concrete chute
Damping device for a magnetically supported rotor
Distance detecting sensor and close range detecting method
Multiple cable connector and method therefor