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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

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Related People

Cunningham, EA Myers, W [+details]


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.