Seagate ST212 - 6.5.6 Time Domain Filter; 6.5.7 Line Driver

&.5.&
TIME DOMAIN FILTER
When a high resolution head reads a low frequency pattern, there is a tendency
for
the head signal to decay between bits. If this decay falls below the zero cross
threshold, a spurious
data bit will be generated. Such false bits are ignored by
delaying the clocking
data bit (le 6L) past the potential point of highest drop.
&.5.7
LINE DRIVER
At this point raw digital data is changed to differential data providing immuni-
ty to common mode noise during transmission.
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ST212 PRODUCT MANUAL/Rev. B