System for recording digital data

Details System for recording digital data System for recording digital data

1988-10-27

1992-12-15

Psitos, Aristotelis

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 40, 360 49, G11B 509, H04N 576

Patent

active

051723590

ABSTRACT:
There is provided a digital data recording system in which digital data which is encoded by the RLL (Run Length Limited) encoding system in which code "1" does not continue is recorded onto a recording medium in accordance with an NRZL (Non Return to Zero) rule. In this system, the digital data is input, a width of pulse corresponding to code "1" in the input digital data is converted into a pulse of a width larger than the pulse width, and the digital data of the converted pulse width is recorded onto the recording medium. A change amount of the pulse width is made different in accordance with the minimum number of codes "0" arranged between codes "1" and "1" in the digital data. With this system, the error rate of the digital data recorded on the recording medium can be reduced. In the case of the same error rate, the recording density can be improved.

REFERENCES:
patent: 4549167 (1985-10-01), Kato et al.
patent: 4558441 (1985-12-01), Yokota et al.
patent: 4860324 (1989-08-01), Satomura
Topical Meeting On Optical Data Storage, Stateline, Nevada, Mar. 11-13, 1987, pp. 106-110, Optical Society of America.
"Digital optical recording-The case for coding".
Wireless World, vol. 88, No. 1555, Apr. 1982, pp. 77-80, "Disc drives".
IBM Technical Disclosure Bulletin, vol. 27, No. 12, May 1985, pp. 7025-7026, "Write-time compensation for 2,7 code".

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