NDLI: Characterization and spectral equalization for hight-density disk recording

Content Provider	IEEE Xplore Digital Library
Author	Chao Chi
Copyright Year	1965
Abstract	For a 3350 type head/disk interface, the amplitude spectrum of an experimental characteristic pulse deviates slightly from the idealized Lorentzian distribution in the signal bandwidth; but the phase spectrum of the experimental pulse is quite distorted from the desired linear phase, causing the widely observed asymmetrical time-domain waveform. A quantitative characterization and comparison are presented and individual transfer functions for ideal linear equalization are proposed. To remove the intersymbol interference, i.e., the linear portion of the distortion, from the playback signal of a high-density system, several cosine-power-law spectral candidates, with minimized noise enhancement and the capability of restoring amplitude loss and timing error, are explored. A unified relationship for the entire family of cosine-power-law spectral shapes and their bandwidth tradeoffs are identified, allowing for optimum read equalization at a tolerable signal-to-noise penalty. This is a useful tool for exploring practical density limitations of any given head/disk interface.
Sponsorship	IEEE Magnetics Society
Starting Page	1447
Ending Page	1449
Page Count	3
File Size	324345
File Format	PDF
ISSN	00189464
Volume Number	15
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Disk recording Bandwidth Magnetic heads Phase distortion Time domain analysis Transfer functions Intersymbol interference Noise shaping Noise level Signal restoration
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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