Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-12-27
1998-04-28
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 59, 369 48, G11B 700, G11B 509
Patent
active
057454680
ABSTRACT:
A signal reproducing device for use in an optical disk apparatus adapted to irradiate an optical disk with light beams and detect a reproduction signal associated with a mark formed on the optical disk from light beams reflected by the optical disk and reproduce data recorded thereon on the basis of the reproduction signal. This signal reproducing device is provided with a first clock generating unit for generating a first clock corresponding to a leading edge of the mark, a second clock generating unit for generating a second clock corresponding to a trailing edge of the mark, a first sampling unit for sampling the reproduction signal according to the first clock, a second sampling unit for sampling the reproduction signal according to the second clock and a selection unit for selecting one of outputs of the first and second sampling unit. Thereby, reproduction signals can be sampled with optimum timing at all times.
REFERENCES:
patent: 5598392 (1997-01-01), Izumi et al.
MAG-92-191, Institute of Electrical Engineers of Japan, Meeting for Study of Magnetics, Increase in density of a magneto-optical disk by partial response using Viterbi decording p. 1 (Abstract), and 77-82 (No Translation).
Huber Paul W.
Olympus Optical Co,. Ltd.
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