Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1994-12-21
1996-09-17
Epps, Georgia Y.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
360 40, 341 58, G11B 7013
Patent
active
055575943
ABSTRACT:
To improve the reliability of reproduction by performing signal processing so that substantially (almost) all DC is eliminated when digital data is recorded on a recording medium such as a magneto-optical disk. When data is recorded on a recording medium such as a magneto-optical disk, generally the digital data is modulated and encoded before being recorded, but sometimes the modulation code is not DC free due to a recording channel code of an NRZI system, etc. According to the present invention, data is divided into parts each having a certain constant length so as to prevent the DC component from building up. A resynchronization signal RESYNC is inserted in the break between the parts, the data is preliminarily modulated and encoded subsequent to the RESYNC, the DC component thereof is counted, and the pattern of the RESYNC is changed in the direction so that the phase becomes a minus value when the sum of the DC components DSV (digital sum value) up to before that RESYNC is a plus value and becomes a plus value when the sum is a minus value, that is, the DSV converges to zero, and the changed data is subjected to modulation and encoding, thereby to reduce the DC component of the recording data.
REFERENCES:
patent: 4501000 (1985-02-01), Immink et al.
patent: 4603413 (1986-07-01), Sinjou et al.
patent: 4775985 (1988-10-01), Busby
patent: 5151699 (1992-09-01), Moriyama
patent: 5349349 (1994-09-01), Shimizume
Patent Abstracts of Japan, vol. 12, No. 162 (E-609), May 17, 1988 and JP-A-62 272 726 (Oki Electric Ind. Co., Ltd.), Nov. 26, 1987.
Patent Abstracts of Japan, vol. 17, No. 681 (P-1660), Dec. 14, 1993 and JP-A-05 225 709 (Hitachi Ltd.), Sep. 3, 1993.
Chiba Nobuhiro
Iwasaki Yasuo
Epps Georgia Y.
Huber P. W.
Sony Corporation
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