TY - JOUR
T1 - A Class of Schneider Write Equalizers for a (1, k) Peak Detection Channel
AU - Lin, Yinyi
AU - Liu, Pi Hai
AU - Huang, Chung Ming
N1 - Funding Information:
Manuscript received January 27, 1994; revised June 13, 1994. This worh was presented in part at the INTERMAG Conference ’93, Stockholm, Sweden, April 13-16. This work was supported by the National Science Council, R.O.C. under contract NSC 82-0404-E008-049. The authors are with the Department of Electrical Engineering, National Central University, Chung Li, Taiwan 32054, R.O.C. IEEE Log Number 9404079.
PY - 1994/11
Y1 - 1994/11
N2 - 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 > 2) for the (1, k) peak detection recording channel will be investigated. The etfects of the equalizers on the linear peak shift and resolution for (1, 7) RLL sequences will be studied, and the capacity of the equalized recording channel will be 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 will be 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 etfects introduced in the recording process, will be considered.
AB - 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 > 2) for the (1, k) peak detection recording channel will be investigated. The etfects of the equalizers on the linear peak shift and resolution for (1, 7) RLL sequences will be studied, and the capacity of the equalized recording channel will be 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 will be 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 etfects introduced in the recording process, will be considered.
UR - http://www.scopus.com/inward/record.url?scp=0028548772&partnerID=8YFLogxK
U2 - 10.1109/20.334300
DO - 10.1109/20.334300
M3 - 期刊論文
AN - SCOPUS:0028548772
SN - 0018-9464
VL - 30
SP - 5087
EP - 5099
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 6
ER -