塗布形磁気テープの変調性媒体雑音

概要

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The properties of medium noise in magnetic recording are usually evaluated by using various different terms; namely, bulk erased noise, AC-biased noise, DC-magnetized noise and recorded signal noise. These evaluated medium noise, however, can be arranged by combining two elemental components. One is the random component which is originated from the rerecording phenomenon of bulk erased noise and the other is the modulated component resulted from bulky irregularities of the medium. The purpose of this paper is to present several data about the later component, the modulation noise, and to investigate the origins of this noise component. Modulation noise is not included in bulk erased noise or AC-biased noise but is included in DC-magnetized noise and recorded signal noise. In DC-magnetized noise, the modulation noise component yields a peculiar transformation of its noise spectrum in the lower frequency region; on the other hand, it produces a side band spectrum skirt beside the signal in the recorded signal noise spectrum. The magnitude of modulation noise takes a maximam at the unsaturated region of a medium and then it gradually decreases with increasing magnetizing level. The roughness of the medium surface and the clustering of magnetic perticles in the coating layer are considered to be the origins of moduration noise; however, as for recent magnetic tapes, the later term seems to be the main origin of the modulation noise.
山口大学の論文