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
Multicyclic compounds and methods of use thereof
Method for manufacturing non-volatile memory device, non-volatile memory element, and non-volatile memory device
Methods circuits apparatuses and systems for facilitating access to online content
Elastic wave device having a capacitive electrode on the piezoelectric substrate
Patterned birefringent product
Pyridylphenyl compounds for inflammation and immune-related uses
Semiconductor memory device, test circuit, and test operation method thereof
  Randomly Featured Patents
Breathing apparatus for underwater swimming or diving
Flexible wrap of rotatably interlocking fluted strips
Diverse multiple article organizing apparatus
Cash register
Apparatus for performing the SNMS method
Electrical supply system and method for improving the operating characteristics of gaseous discharge display panels
Cycle safety disc
Method and apparatus for driving electro-luminescence display device
Packet concatenation for increased transmission capacity
Total structural risk model