Playback clock extracting apparatus

Details Playback clock extracting apparatus Playback clock extracting apparatus

1998-05-18

2000-10-17

Faber, Alan T.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 65, G11B 509

Patent

active

061340642

ABSTRACT:
A playback clock extracting device having: a quantization member for quantizing, at a sampling clock rate having a rate twice a recording rate, a signal played back from a recording medium so as to output sample data, a digital equalizer for subjecting the sample data to digital equalization so as to alternately output playback data and PLL data at an interval of one sampling clock, cycle a ternary decision member for making a ternary decision as to whether the playback data is positive, zero or negative. The playback clock extracting device further having arithmetic unit for calculating a sampling phase error in the quantization member by multiplying a result of the decision of the ternary decision member by a difference between two successive data values of the PLL data outputted immediately prior to and immediately after the playback data for the decision of the ternary decision member, respectively, a sampling clock generating member which controls a phase and an oscillation frequency on the basis of the sampling phase error outputted by the arithmetic unit so as to generate the sampling clock, and a playback clock generating member which divides a frequency of the sampling clock by two so as to generate a playback clock for detecting the playback data.

REFERENCES:
patent: 6002538 (1999-12-01), Kanegae et al.
Recent Developments of Signal Processing in Digital Magnetic Storage, Mr. Seiich Mita in the Journal o the Institute of Electronics, Information and Communication Engineers of Japan, C-II, vol. J75-C-11, No. 11, pp. 6511-623, Nov., 1992.

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