Adaptively stabilized recording for direct read after write opti

Details Adaptively stabilized recording for direct read after write opti Adaptively stabilized recording for direct read after write opti

1982-12-23

1985-08-27

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369107, 369116, 346 76L, G11B 700, G01D 1514

Patent

active

045382573

ABSTRACT:
To desensitize the write channel of a direct read after write optical memory from time dependent changes in the operating characteristics of the hardware and from time and position dependent variations in the performance characteristics of the recording medium, the present invention provides a real time feedback system for adjusting the output power of the write laser or similar source and/or for adjusting the modulation timing of the write beam so as to null out any unwanted dc component that is exhibited by the recorded data during the direct read after write process. In other words, the feedback stabilizes the timing of the transitions in the recorded data.

REFERENCES:
patent: 3995264 (1976-11-01), Ouchi
patent: 4027335 (1977-05-01), Miller
patent: 4063287 (1977-12-01), van Rosmalen
patent: 4093961 (1978-06-01), Kanamaru
patent: 4162398 (1979-07-01), Kayanuma
patent: 4380015 (1983-04-01), Ito et al.
Norris, Kermit and Bloomberg, Dan S, "Channel Capacity of Charge-Constrained Run-Length Limited Codes"--IEEE Transactions on Magnetics, vol. Mag. 17, No. 6, Nov. 1981, pp. 3452-3455.

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