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Bit Response of a PR4 Encoded Magnetic Medium
Bit Response of a PR4 Encoded Magnetic Medium
PR4 coding is a type of partial-response bit detection that increases areal bit density over the peak detect technique. In magnetic recording, the detection of a domain reversal on the media produces a pulse or "blip." Unlike peak detection, PR4 involves sampling at points other than the peak of the blip. The read signal is a superposition of successive blips of alternating polarity.