Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium
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United States of America Patent
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Aug 22, 2000
Issued Date -
N/A
app pub date -
Apr 25, 1997
filing date -
May 12, 1995
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Abstract
A sampled amplitude read channel is disclosed for reading data recorded on a disk storage medium by detecting an estimated binary sequence from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over the disk storage medium. The read channel comprises a sampling device, such as an analog-to-digital converter (A/D), for sampling the analog read signal to generate the discrete time sample values and for sampling at least one other auxillary analog input signal, such as a servo control signal. In this manner, performance characteristics of the read channel can be measured, such as the driving current applied to the servo control voice coil motor (VCM), without requiring additional hardware.
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