Journal ArticleDOI
Some notes on "superposition" in digital magnetic recording
TLDR
In this paper, a treatment based on the Preisach model and ignoring the demagnetizing field is presented, and it is shown that superposition is inconsistent with this model when more than two transitions are involved.Abstract:
Reasons for, and the character of, deviations from the "superposition" principle which is customarily used in considerations about digital magnetic recording are analyzed. First, a treatment is presented which is based on the Preisach model and ignores the demagnetizing field. It is shown that superposition is inconsistent with the Preisach model but that, when more than two transitions are involved, a weaker form of the superposition principle can be derived from the Preisach model. Next, the effects produced by the demagnetizing field in the medium are illustrated by results of a "self-consistent" computation for a thin layer. Finally, some experimental results obtained from a large-scale simulation model are presented.read more
Citations
More filters
Journal ArticleDOI
Digital magnetic recording theory
TL;DR: In this paper, a brief review of magnetic recording theory is given with emphasis on the analysis of ferrite, inductive thin film, and magnetoresistive heads, and the utility of several approaches is demonstrated by three calculations: (1) resolution and signal amplitude of a shielded magnetoregressive head, (2) readback properties of a single sheet of permalloy with adjacent current conductor, and (3) analysis of spurious pulses generated by outside corners of the ferrite heads.
Journal ArticleDOI
Tutorial review of magnetic recording
TL;DR: The fundamentals of the media magnetization and writing processes are considered and the factors limiting the bandwidth, distortion, and signal-to-noise ratio of audio, instrumentation, video, and digital recording machines are analyzed.
Journal ArticleDOI
The helical-scan magnetic tape recorder as a digital communication channel
R. Wood,R. Donaldson +1 more
TL;DR: A method is presented whereby channel nonlinearity may be quantified in a format useful for signal and receiver design, and measurements show this non linearity to be relatively small for symmetric two-level signals.
Journal ArticleDOI
Overwrite as a function of record gap length
D. Wachenschwanz,F. Jeffers +1 more
TL;DR: In disk recorders, a common head is used for both recording and reproducing as discussed by the authors, and the amount of erasure of the old data signal is called "overwrite", and 30 dB is typically required.
Journal ArticleDOI
A unified view of high density digital recording theory (invited)
TL;DR: In an attempt to unify digital recording theory, the principal ideas concerning pulse response, linear superposition, medium properties, head geometry, channel codes, signal-to-noise ratio, post-equalization and achievable bit densities are discussed.
References
More filters
Journal ArticleDOI
Self-consistently computed magnetization patterns in thin magnetic recording media
R. Potter,R. Schmulian +1 more
TL;DR: In this article, a model involving head motion for self-consistently computing magnetic recording medium magnetization patterns is given, and the reduction in demagnetizing field due to the presence of the high-permeability head structure is included, as is record head removal, read head replacement, and computation of the readback voltage.
Book
Digital Magnetic Recording
TL;DR: This revised and up-to-date work focuses on digital magnetic recording principles and, using an integrated approach, highlights the interrelationship and significance of design parameters on the storage of digital information.
Journal ArticleDOI
Theory of linear superposition in tape recording
J. Mallinson,C. Steele +1 more
TL;DR: In this paper, the conditions under which linear superposition of isolated pulses is valid for the synthesis of multibit waveforms are examined theoretically, subject to three conditions; first, all the processes following the write process were linear operations on the tape magnetization; second, the write field rise time was less than the bit interval; and third, each change in magnetization, occurring during the write, was a function only of the field causing that change.
Journal ArticleDOI
A 5000: 1 Scale Model of the Magnetic Recording Process
D. L. A. Tjaden,J. Leyten +1 more
Journal ArticleDOI
Superposition measurements with a flux-sensitive head in digital magnetic recording
TL;DR: In this article, the validity of the use of superposition in high-density recording systems was investigated for thin oxide, thick oxide, and metallic disks, both as regards pulse shape and validity of using superposition.
Related Papers (5)
Self-consistently computed magnetization patterns in thin magnetic recording media
R. Potter,R. Schmulian +1 more
A theoretical study of an isolated transition using an iterative hysteretic model
N. Curland,D. Speliotis +1 more