Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1991-07-11
1992-08-11
Logan, Sharon D.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
375 17, 375101, 341102, 341106, H03M 700, H03M 720, H04L 2534
Patent
active
051383144
ABSTRACT:
In a data conversion method of converting source data of M bit unit to be recorded on a recording medium into conversion data of N (>M) bit unit, n, which is a number of inter-symbol interferences permitted in a transmission path, continuous codes in the codes of the conversion data are weighted with a weighting distribution decreasing linearly from a distribution center, the weighted n continuous codes are sequentially added to form the intermediate series, and then such conversion data that the sum of absolute values of differences of codes between the intermediate series (i.e., the code length) is more than a predetermined number of times as large as a reference value of the weighting coefficient is selected as a modulation code, whereby the pattern length between the code patterns can be made larger to thereby improve the recording density remarkably with using the present recording medium and recording and/or reproducing apparatus. Further, the pattern of the reproduced signal corresponding to the data to be detected is compared with a code pattern group corresponding to each conversion data to select a similar pattern so that the conversion data recorded at a remarkably high recording density can be positively detected while using the present recording medium and recording and/or reproducing apparatus.
REFERENCES:
patent: 4584690 (1986-04-01), Cafiero et al.
patent: 4953160 (1990-08-01), Gupta
patent: 5018134 (1991-05-01), Kokubo et al.
patent: 5025443 (1991-06-01), Gupta
patent: 5027369 (1991-06-01), Kuenast
Chaki Yasuyuki
Ino Hiroyuki
Shimpuku Yoshihide
Dowden Donald S.
Eslinger Lewis H.
Logan Sharon D.
Sony Corporation
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