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Application of Partial-response Channel Coding to Magnetic Recording Systems

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2 Author(s)
Kobayashi, H. ; IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA ; Tang, D.T.

A magnetic recording channel can be regarded as a “partial-response” channel because of its inherent differentiation in the readback process. The conventional NRZI method of recording is shown to be equivalent to the “precoding” of this particular partial-response channel, the purpose of which is to limit the propagation of error in the channel output. Using this new viewpoint, one can readily adopt an error detection scheme (developed for general partial-response channels) that takes full advantage of the inherent redundancy in the three-level channel output. The detection scheme is optimum in the sense that it detects all detectable errors with minimum delay.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:14 ,  Issue: 4 )

Date of Publication:

July 1970

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