专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明专利

GB2492708A Two-level BCH codes for solid state storage devices 未知
公开(公告)号：GB2492708A
公开(公告)日：2013-01-09
申请号：GB201219123
申请日：2011-03-23
申请人： IBM
发明人： CIDECIYAN ROY D , ELEFTHERIOU EVANGELOS , MITTELHOLZER THOMAS
IPC分类号： G06F11/10 , H03M13/15 , H03M13/29
摘要： Methods and apparatus are provided for encoding input data for recording in s-level storage(2)of a solid state storage device(1), where sâ ¥2. Input data words are encoded in groups of M input data words in accordance with first and second BCH codes to produce, for each group, a set of M first codewords of the first BCH code. The set of M first codewords is produced such that at least one predetermined linear combination of the M first codewords produces a second codeword of the second BCH code, this second BCH code being a sub- code of the first BCH code. The sets of M first codewords are then recorded in the s-level storage(2).If each of the first and second codewords comprises N q-ary symbols where q =pk, k is a positive integer and p is a prime number, the q-ary code alphabet can be matched to the s-ary storage (2) by ensuring that q and s are uth and vth powers respectively of a common base r, where u and v are positive integers and kâ ¥u, whereby p(k/u)v = s.

32. 发明专利

DE112010003887T5 Datenverwaltung in Halbleiter-Speichereinheiten 未知
公开(公告)号：DE112010003887T5
公开(公告)日：2012-08-23
申请号：DE112010003887
申请日：2010-12-16
申请人： IBM
发明人： CIDECIYAN ROY D , ELEFTHERIOU EVANGELOS S , HU XIAO-YU , ILIADIS ILIAS , HAAS ROBERT
IPC分类号： G06F11/10
摘要： Bereitgestellt werden ein Verfahren und eine Vorrichtung für das Steuern einer Halbleiter-Speichereinheit (5), in welcher der Halbleiterspeicher (6) löschbare Blöcke umfasst, die jeweils eine Vielzahl von Datenschreib-Speicherstellen umfassen. Eingabedaten werden in aufeinanderfolgenden Gruppen von Datenschreib-Speicherstellen gespeichert, wobei jede Gruppe Schreib-Speicherstellen in einem Satz von löschbaren Blöcken in jeder aus einer Vielzahl von logischen Teilbereichen des Halbleiterspeichers (6) umfasst. Die Eingabedaten werden so Fehlerkorrektur-codiert, dass eine jede Gruppe einen Fehlerkorrektur-Code für die Eingabedaten in der Gruppe enthält; Metadaten, welche die Speicherstelle von Eingabedaten in dem Halbleiterspeicher (6) angeben, werden in dem Speicher (13) verwaltet. Zudem wird eine Angabe für die Gültigkeit von Daten, die in einer jeden Datenschreib-Speicherstelle gespeichert sind, verwaltet. Vor dem Löschen eines Blocks werden gültige Eingabedaten aus der oder aus einer erstellen in dem Block enthält. Die wiederhergestellten Daten werden dann als neue Eingabedaten erneut gespeichert.

33. 发明专利

CA2717616A1 WORD SYNCHRONIZATION FOR SERVO READ SIGNALS IN TAPE DRIVES 未知
公开(公告)号：CA2717616A1
公开(公告)日：2009-12-23
申请号：CA2717616
申请日：2009-06-09
申请人： IBM
发明人： CHERUBINI GIOVANNI , CIDECIYAN ROY D , ELEFTHERIOU EVANGELOS S , JELITTO JENS
IPC分类号： G11B5/584
摘要： Methods and apparatus are provided for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read from magnetic tape (3) in tape drives (1). A soft output detector (11) processes the PPM-encoded servo pattern read signal to produce a series of soft output samples corresponding to respective bits encoded in the servo pattern. A sync word detector (12) then produces block correlation values for respective positions of a sliding L-sample block in the soft output sample series. The block correlation values are produced by calculating, at each block position, bit correlation values indicating correlation between respective samples and corresponding bits of the sync word, and summing each bit correlation value minus a predetermined function of the corresponding sample value. The sync word detector (12) then detects a sync word at the block position with the maximum block correlation value in an (N+L-1)-sample sequence of the soft output sample series.

34. 发明专利

GB2355165A Maximum transition run (MTR) encoding where prohibited portions of block coded data are replaced with substitute portions 未知
公开(公告)号：GB2355165A
公开(公告)日：2001-04-11
申请号：GB0016683
申请日：2000-07-07
申请人： IBM
发明人： CIDECIYAN ROY D , COKER JONATHAN D , ELEFTHERIOU EVANGELOS , GALBRAITH RICHARD L , TRUAX TODD
IPC分类号： G11B20/14 , G11B20/18 , H03M5/14 , G06F11/10 , H03M7/14 , H03M7/42 , H03M13/01 , H03M13/05 , H03M13/31 , H04L1/00 , H04L25/49
摘要： Methods and apparatus are provided for encoding a succession of m-bit data words to produce a succession of n-bit code words, where n > m, for supply to a magnetic recording channel. Each m-bit data word is partitioned into a plurality of blocks of bits (5a, 6a, 7a), and at least one of said blocks is encoded (5, 6, 7) in accordance with a block coding scheme such that the resulting bit sequence derived from the m bits of the data word comprises an n-bit sequence (5b, 6b, 7b). An n-bit code word is then produced by at least one stage of violation correction (8,9). The or each stage of violation correction comprises detecting the occurrence of any of a plurality of prohibited bit patterns at one or more predetermined locations in the n-bit sequence, and replacing any prohibited bit pattern so detected by a respective substitute bit pattern (8b, 9b). The block coding scheme and the prohibited and substitute bit patterns are predetermined such that, in a succession of said n-bit code words, the maximum number of consecutive bits of one value is limited to a first predetermined number j, where j / 2, and the maximum number of consecutive bits of the other value is limited to a second predetermined number k.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式