Clocking method and apparatus for use with partial response code

Details Clocking method and apparatus for use with partial response code Clocking method and apparatus for use with partial response code

1988-10-17

1990-11-13

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 46, G11B 509

Patent

active

049706098

ABSTRACT:
Clocking of Class IV partial response coded binary data is provided by way of circuit means that includes two analog threshold detectors. One detector is responsive to the analog read signal's positive-going amplitude corssing a a preset positive threshold value. The other detector is responsive to the read signal's negative-going amplitude crossing a preset negative value. The time of occurrence of both detector crossing transitions is phase-compared to a clock signal, and a phase error signal is generated for each detector, if a phase error exists. The two phase error signals are integrated by the use of a loop filter. The integrated phase error signal is then used to adjust the phase of a clock signal generator. The output of the clock signal generator is used to accurately clock, and to enable accurate recover of, the binary data that was originally encoded and written in accordance with the Class IV partial responsive coding convention.

REFERENCES:
patent: 4504872 (1972-03-01), Petersen
patent: 4528601 (1985-07-01), Moriyama et al.
patent: 4837642 (1989-06-01), Smidth
C. Coleman, D. Lindhol, D. Peterson & R. Wood, "High Data Rate Magnetic Recording in a Single Channel", 2-5 Apr. 1984, pp. 151-157. Institute of Electronic and Radio Engineers.
R. Wood, S. Anlgrim, K. Hallamsek, & R. Stenerson, "An Experimental Eight-Inch Disc Drive with One-Hundred Megabytes Per Surface", Sep. 1984, vol. Mag-20, No. 5, pp. 698-702, IEEE Transactions on Magnetics.
P. Kabal & S. Pasupathy, "Partial-Response Signaling", Sep. 1975, pp. 921-033. IEEE Transactions on Communications, vol. Com-23, No. 9.
H. Kobayashi & D. T. Tang, "Application of Partial-Response Channel Coding to Magnetic Recording Systems", Jul. 1970,. pp. 368-375, IBM Journal of Research and Development.

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