Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital logic testing
Patent
1999-02-25
2000-10-17
De Cady, Albert
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital logic testing
G01R 3128, G06F 1100
Patent
active
061346918
ABSTRACT:
An NLTS (non-linear transition shift) correction circuit for hard disk drives improves flexibility in modifying algorithm of the data pattern analysis utilized therein and NLTS correction precision thereof. The NLTS correction circuit of the present invention uses a data pattern analyzer including a CPU and a data pattern analysis program. Selector control signals produced by this analyzer are stored in a selector control signal buffer memory and are output to a selector in synchronization with the output from a data buffer memory. The pattern of data to be recorded can be analyzed while flexibly responding to the fluctuations in the characteristic of the recording medium by modifying the analyzing program. Moreover, the difference in the amount of delay between the delay lines can be calibrated by adding a circuit for calibrating the NLTS correction value, which includes a circuit that converts the duty cycle of the record data signal to voltage value. The circuit realizes the improved precision of the NLTS correction circuit.
REFERENCES:
patent: 5355261 (1994-10-01), Taratorin
patent: 5835299 (1998-11-01), Lee et al.
Liu, Bo et al., Novel Method for Real-Time Monitoring of Non-Linear Transition Shift, IEEE, pp. 2698-2700, Sep. 1997.
Muraoka, H et al., Experimental Study of Nonlinear Transition Shift in Perpendicular Magnetic Recording with Single-Pole Head, IEICE Trans Electron, p. 1187-1193, Sep. 1997.
Honda, N et al., Time Dependence of Magnetic Properties in perpendicular Recording Media, IEICE Trans. Electron., p. 1180-1186, Sep. 1997.
Taratorin, A et al., The Dependence of Overwrite on Non-Linear Transition Shift, IEEE, p. 26892691, Sep. 1997.
Taratorin, A, Non-Linear Interactions in a Series of Transitions, IEEE, p. 656-959, Sep. 1997.
IEEE Transaction on Magnetics, vol. 31, No. 1, Jan. 1995, pp. 816-819, Guo Mian, "An Algorithm for a Real Time Measurement of Nonlinear Transition Shift by a Time Domain Correlation Analysis".
IEEE Transaction on Magnetics, vol. 27, No. 6, Nov. 1991, pp. 4831-4833, J. Moon et al., "Nonlinear Effects of Transition Broadening".
VM65070 Analog PRML Channel, Feb. 1997, pp. 6-139, 6-168, "Advance Information".
Agilent Technologie,s Inc.
Cady Albert De
Chase Shelly A
LandOfFree
NLTS correction circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with NLTS correction circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NLTS correction circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-479804