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PR4 Coding of a Magnetic Hard Drive
PR4 Coding of a Magnetic Hard Drive
This Demonstration simulates the received signal from a PR4 encoded channel of a magnetic hard disk. PR4 encoding is a type of partial response maximum likelihood (PRML) technique. Unlike the peak detect technique, PRML samples the analog signal received from the disk at times other than the interval of peak response of a magnetic transition. Also, signals from adjacent transitions are allowed to overlap, producing what is known as intersymbol interference (ISI). A digital filter is used to eliminate the effect of ISI.