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
6-O-substituted benzoxazole and benzothiazole compounds and methods of inhibiting CSF-1R signaling
Trash bag retention device
Method and system for triggering message waiting indicator delivery
Optical modulator module
Heterogeneous language data typing without executable regeneration
Methods, systems, and computer-readable media for providing an event alert
Micro positioning test socket and methods for active precision alignment and co-planarity feedback
  Randomly Featured Patents
Voice recording device having portable and local modes of operation
Network routing of data based on content thereof
Method and a device for radiography and a radiation detector
Travelling support for scaffolding
Method of producing high-temperature superconductor thin film device
Method and apparatus for scalable distribution of information in a distributed network
Bearing having arch-shaped recesses
Staple removing device
Ultra high density flash memory
Ergonomic upright wheeled luggage