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Signal Modulator Which Simulates Magnetic Media Defects

IP.com Disclosure Number: IPCOM000039684D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Cunningham, EA Myers, W [+details]

Abstract

The described circuit accurately generates electronic signals analogous to those found during surface analysis testing of magnetic data storage media, specifically including modulated "defects" as might be found on non-ideal media. The following formula is duplicated to represent the complete mathematical model of the complex phenomenon involved in magnetic modulation. Vout = d(m(x) * M(x)) / dt = [M(x) * d(m(x)/dt] [M(x) * d(m(x)/dt] where m(x) = the envelope of available magnetization from the media, including the defect, and M(x) = the ideal magnetization of the media, which represents the information stored. The mathematical expansion shows the first term not present in standard amplitude modulators, which only simulates the second term.