Coded data generation or conversion – Digital code to digital code converters – To or from nrz codes
Patent
1997-10-08
2000-01-11
Young, Brian
Coded data generation or conversion
Digital code to digital code converters
To or from nrz codes
360 48, 369 4439, H03M 506, H03M 746, G11B 509
Patent
active
060140968
ABSTRACT:
If there is any portion in channel bit data obtained on converting a signal read out from a recording medium into a bi-level signal which fails to satisfy a condition concerning a minimum run length or a maximum run length of the same symbol, the channel bit data is corrected to improve the bit error rate to secure a skew margin. To this end, channel bit data not satisfying a minimum run length d' of the same symbol is detected by a (d'-1) detector 4 using n-tupled clocks obtained on n-tupling channel clocks of playback data by a bit clock generator 2, where n is an integer not less than 2. A correction position of the channel bit data having the run length of the same symbol equal to (d'-1) is designated by a correction bit position designating unit 5. A data correction unit 6 then corrects the channel bit data so that the minimum run length of the same symbol will be equal to d'.
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Patent Abstracts of Japan, vol. 10, No. 52 (P-432), Feb. 28, 1985 & JP 60 195783 A (Ricoh KK), Oct. 4, 1985.
NN: "Encoding and Decoding Checking Arrangement for 2-7 Run Length Limited Codes" IBM Technical Disclosure Bulletin, vol. 23, No. 4, Sep. 1980, pp. 1635-1636, XP002092690 US.
Iida Michihiko
Ino Hiroyuki
Kai Shinichi
Kawashima Tetsuji
Nakagawa Toshiyuki
Frommer William S.
Jean-Pierre Peguy
Sony Corporation
Young Brian
LandOfFree
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