NDLI: Directional CRA for ternary digital recording

Content Provider	IEEE Xplore Digital Library
Author	Chi, C. Frey, K.
Copyright Year	1965
Abstract	A directional Controlled Return-to-AC (CRA) code is conceived where a "break" is substituted for a conventional step "transition" in saturated digital recording. The "breaks" are embedded in frequency controllable rapid dithering pulses. Each break, with a pre-determined break width, has directional freedom during the encoding WRITE mode. The combination of direction and its presence or absence allows the mapping of three binary bits into two CRA digits. A 50 percent information density increase over the popular MFM code is potentially realizable. The read signal from the CRA code has a well confined signal spectrum and requires neither dc nor low frequency spectral components. It is self-clocking and has effective overwrite. Since the readback waveform contains only directional "doublets", its amplitude is stable and its timing is accurate. These characteristics allow very simple and reliable data detection. "CRA" is believed to be one of the first practical realizations of a free-directionality code in saturated digital magnetic recording.
Sponsorship	IEEE Magnetics Society
Starting Page	1259
Ending Page	1261
Page Count	3
File Size	444924
File Format	PDF
ISSN	00189464
Volume Number	18
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital recording Magnetic force microscopy Digital magnetic recording Passband Timing Magnetic flux Saturation magnetization Magnetic heads Frequency response Nonlinear distortion
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Magnetic force microscopy of recording heads

The effect of write head saturation on the characteristics of AC bias recording

Performance comparison of unshielded and shielded MR read heads for digital tape recording

Saturation magnetic recording process

The effects of record head saturation on digital output

Magnetic recording tape with double layer coatings

Multiple magnetic image reflection in perpendicular recording

Volterra modeling of digital magnetic saturation recording channels

Write saturation current as a function of tape magnetization

Directional CRA for ternary digital recording

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