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Finding a digital code that maximizes the net linear density while maintaining satisfactory data reliability is a frequent objective in designing a channel for digital magnetic recording. This tutorial paper summarizes analog channel characteristics significant to the modulation and error-correction codes. Selection parameters for a modulation code are also discussed. Three statistical distributions are considered that describe the observable effects of the underlying probability of error. These distributions form the basis for selecting the error-correction code. Consideration is also given to the impact of system constraints on the selection of digital codes.
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Kiwimagi et al. (1974) studied this question.
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