Browse Prior Art Database

Data Shift Sampling Device

IP.com Disclosure Number: IPCOM000065045D
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Langr, PJ Monson, RP [+details]

Abstract

A device for measuring bit shift for a large number of consecutive bits stored on a moving media is described. Both the amount of shift and the distribution of shift is measured so that evaluation of timing and performance is possible with respect to data shift. Past devices sampled for data bit shift at a rate which failed to detect adjacent bit incongruities. The device described senses consecutive bits to uncover such incongruities. In the figure, a data shift sampling system (DSSS) is indicated generally at 10. A disk file 12 contains a plurality of data windows in which data pulses or bits are written. Ideally the data pulse falls in the middle of the data window, but due to many factors (media defects, noise interference, etc.) the data pulse moves relative to the data window center.