| 摘要 |
PROBLEM TO BE SOLVED: To provide such a method of measuring nonlinear distortion of a digital record, as a phase distortion and an amplitude distortion can be measured separately with precision, a direction of a phase distortion is identified, and this measured phase distortion value can be used as a record pre-correction quantity. SOLUTION: When a nonlinear distortion is measured at magnetic recording, this method is to provide a non-linear distortion measuring method by which phase distortion (δ) and amplitude distortion (r) are separated and also with precision, for example, in a phase distortion measurement, phase distortion quantity in a desired recording density is obtained with precision and also a direction of the distortion is obtained by directly precorrecting dibit part of a recording pattern for recording. Moreover, from this quantity, the amplitude distortion quantity (r) in the recording density can be calculated with precision. It is possible to use the pre-correction quantity used for the measurement then as an optimal pre-correction quantity for a control at a time of recording operation.
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