Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Azimuth Skew Compensation

IP.com Disclosure Number: IPCOM000050727D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ferdie, RD: AUTHOR

Abstract

Prerecorded magnetic tapes can carry periodic patterns which identify the combined skew affect of the head, drive and tape combination between the outer tracks. The recording channel system then detects and sets time delays for a zone or zones of the earlier arriving outer tracks. The time delay may be set as a constant or as a variable. The periodic patterns identify the combined edge track to edge track azimuth skew and identify which edge track is the earliest.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 78% of the total text.

Page 1 of 1

Azimuth Skew Compensation

Prerecorded magnetic tapes can carry periodic patterns which identify the combined skew affect of the head, drive and tape combination between the outer tracks. The recording channel system then detects and sets time delays for a zone or zones of the earlier arriving outer tracks. The time delay may be set as a constant or as a variable. The periodic patterns identify the combined edge track to edge track azimuth skew and identify which edge track is the earliest.

With an increased number of tracks and higher magnetic recording densities, the recording channel has become critical to meet the azimuth skew requirements of the manufacturing tolerances for the head and the drive systems. Since azimuth skew is related to the time difference between information on different tracks, the azimuth skew can be compensated by periodic patterns on the magnetic tapes that are prerecorded at the beginning or at the end of the tape. The periodic patterns identify the combined skew effect of the head and the tape drive between the outer tracks. The recording channel then utilizes a technique for detecting the time delay between the two information bits of the same byte received by the outer tracks. Appropriate time delays are then set in a decreasing pattern from a leading outer track to the opposite outer track. The key control is from the periodic patterns to identify combined edge track to edge track azimuth skew and to identify which edge track has t...