A class of Schneider write equalizers for a (1,k) peak detection channel

Schneider write equalization has been proposed in some digital recording systems. In this paper, a class of Schneider write equalizers with zero degree phase shift and with added pulse width equal to T/M (M is an integer greater than 1, M/spl ges/2) for the (1,k) peak detection recording channel are...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 30; no. 6; pp. 5087 - 5099
Main Authors Lin, Yinyi, Liu, Pi-Hai, Huang, Chung-Ming
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.11.1994
Institute of Electrical and Electronics Engineers
Subjects
Applied sciences
Audio tapes
Demagnetization
Digital recording
Electronics
Equalizers
Exact sciences and technology
Hardware
Intersymbol interference
Modulation coding
Phase detection
Recording and replay of audio and video signals
Space vector pulse width modulation
Storage and reproduction of information
Design
Theoretical study
Nonlinearity
Digital recording
Equalizer
Recording
Equalization
Block diagram
Magnetic device
Demagnetization
Magnetic recording
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Summary:Schneider write equalization has been proposed in some digital recording systems. In this paper, a class of Schneider write equalizers with zero degree phase shift and with added pulse width equal to T/M (M is an integer greater than 1, M/spl ges/2) for the (1,k) peak detection recording channel are investigated. The effects of the equalizers on the linear peak shift and resolution for (1,7) RLL sequences are studied, and the capacity of the equalized recording channel compared, under the assumption of an ideal Lorentzian channel model. One of the equalizers with added pulse width T/2 together with a 2/3 (1,7) RLL code is applied to an R-DAT (rotary head-digital audio tape recorder) and results show improvement in recording density and data transfer rate over an 8/10 (0,3) DC-free code. This class of equalizer together with a (1,k) RLL sequence can be described as a new modulation sequence and the power spectrum is computed based on the new modulation sequence. As added pulses of this class of equalizers are very narrow, especially for large M, the linear channel model might not be accurate because of nonlinear distortion due to inadequate write current risetime and/or to the demagnetization field from recorded transitions. Hardware implementations of the equalizers, including compensation for nonlinear effects introduced in the recording process, are considered.< >
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9464
1941-0069
DOI:10.1109/20.334300