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Abstract

In a digital information coding system for transforming a binary digital information train without limitation of bit arrangement into run length limited binary codes, the run length taking only a value obtained by adding an integer multiple of a specific positive integer s to a minimum value d, within the range of the minimum value d and the maximum value k, and the positive integer s is 2 or more and is an aliquant number relative to d+1, and the maximum value k is a value obtained by adding an integer multiple of the positive integer s to the minimum value d. The advantages of this coding system are that the gradient of a magnetization reversal distance relative to a discrimination timing window width can be set as desired, and that the minimum magnetization reversal distance and the effective data discrimination timing window width during signal reproducing can be set as desired within the range of the channel capacities and have a considerable degree of freedom which has not been obtained by conventional codes.

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