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1278 条记录 (耗时 0.023 秒)

    DC suppression by choice of synchronisation word
    72.
    发明公开
    DC suppression by choice of synchronisation word 审中-公开
    Auswahl eines SynchronisierungswortesGleichspannungsunterdrückungdurch

    公开(公告)号：EP1458155A2

    公开(公告)日：2004-09-15

    申请号：EP04251274.9

    申请日：2004-03-04

    申请人： Samsung Electronics Co., Ltd.

    发明人： Shim, Jae-seong ,  Kim, Jin-han ,  Park, Hyun-soo, 701 Dongil Apt.

    IPC分类号： H04L25/49

    CPC分类号： G11B20/1426 ,  G11B20/1866 ,  G11B27/3027 ,  G11B2020/1457 ,  H04L25/4915

    摘要： A data modulation method to suppress a DC component using parity information of a synchronization codeword, and an apparatus for executing the method. Input data is multiplexed according to multiplexing information, the synchronization codeword including the multiplexing information for a multiplexed data stream is inserted, modulation is performed and plural modulated data streams are output, and a respective one of the modulated data streams having a DC component, which is smallest is selected from among the modulated streams. The synchronization codeword has a bit to control the parity of the codeword, and the input data is multiplexed according to whether a parity of the synchronization codeword is even or is odd. Thus, the DC component included in the modulated codeword stream may be more effectively suppressed without a decrease in a code rate.

    摘要翻译： 一种使用同步码字的奇偶校验信息抑制DC分量的数据调制方法，以及用于执行该方法的装置。 根据复用信息对输入数据进行多路复用，插入包含多路复用数据流的复用信息的同步码字，进行调制，输出多个调制数据流，调制数据流中的相应一个具有DC分量， 从调制流中选择最小。 同步码字具有控制码字的奇偶性的位，并且根据同步码字的奇偶校验是偶数还是奇数来复用输入数据。 因此，可以更有效地抑制包含在调制码字流中的DC分量，而不会降低码率。

    Code allocation method
    73.
    发明公开
    Code allocation method 审中-公开
    Kodeverteilverfahren

    公开(公告)号：EP1450492A2

    公开(公告)日：2004-08-25

    申请号：EP04010410.1

    申请日：2002-04-19

    申请人： Samsung Electronics Co., Ltd.

    发明人： Shim, Jae-seong ,  Kim, Ki-hyun ,  Park, Hyun-soo ,  Jung, Kiu-hae ,  Maboob, Iqbal

    IPC分类号： H03M5/14

    CPC分类号： G11B20/1426 ,  G11B2020/1457 ,  H03M5/145 ,  H03M7/46

    摘要： A method for allocating codewords is provided. The method includes allocating one of two selectable codewords b1 and b2 as codeword b when a preceding codeword b and a following codeword c form a code stream Y, in which codewords b1 and b2 have opposite INVs which are parameters indicating whether the number of '1s' contained in a codeword is an odd number or an even number and when the code stream of b1 and c is Y1, and the code stream of b2 and c is Y2, allocating codewords such that the INVs of Y1 and Y2 are maintained to be opposite when the codeword, b1, b2 or c should be replaced by another codeword in compliance with a predetermined boundary condition between codewords. According to the method, by using a short codeword having less bits as a main conversion codeword, high efficiency is achieved in recording density. Also, when codewords which do not satisfy the run length conditions are replaced by other codewords, the codewords are allocated so that the DC suppression capability of the code stream can be maintained, and therefore higher DC suppression capability of the code stream is provided.

    摘要翻译： 提供了一种用于分配码字的方法。 该方法包括：当前一码字b和后续码字c形成码流Y时，将两个可选码字b1和b2中的一个分配为码字b，其中码字b1和b2具有相反的INV，这些INV是指示“1” 码字中包含的数字是奇数或偶数，当b1和c的码流为Y1时，b2和c的码流为Y2，分配码字使得Y1和Y2的INV保持为 当码字b1，b2或c应该被符合码字之间的预定边界条件的另一个码字替换时相反。 根据该方法，通过使用具有较少位的短码字作为主转换码字，在记录密度方面实现高效率。 此外，当不满足游程长度条件的码字被其他码字替换时，分配码字，使得能够维持码流的直流抑制能力，因此提供码流的更高的DC抑制能力。

    MULTI-DIMENSIONAL CODING ON QUASI-CLOSE-PACKED LATTICES
    76.
    发明公开
    MULTI-DIMENSIONAL CODING ON QUASI-CLOSE-PACKED LATTICES 审中-公开
    多维CODING准密封装在一起的网格

    公开(公告)号：EP1440514A1

    公开(公告)日：2004-07-28

    申请号：EP02775080.1

    申请日：2002-10-14

    申请人： Koninklijke Philips Electronics N.V.

    发明人： COENE, Willem, M.,J.,M. ,  OPHEY, Willem, G.

    IPC分类号： H03M5/14 ,  G11B20/14

    CPC分类号： G11B20/1426 ,  G11B7/14 ,  G11B7/24085 ,  G11B7/24088 ,  H03M5/145

    摘要： The present invention relates to a method and system for multi-dimensionally coding and/or decoding an information to/from a lattice structure representing bit positions of said coded information in at least two dimensions. Encoding and/or decoding is performed by using a close-packed lattice structure, preferably a quasi-hexagonal lattice structure. In particular, at least partial quasi-hexagonal clusters consisting of one central bit and a plurality of nearest neighboring bits can be defined, and a code constraint can be applied such that for each of said at least partial quasi-hexagonal clusters a predetermined minimum number of said nearest neighboring bits are of the same bit state as said central bit. Thereby, intersymbol interferences can be minimized at a high code efficiency. Furthermore, another code constraint can be applied such that for each of said at least partial quasi-hexagonal clusters a predetermined minimum number of said nearest neighboring bits are of the opposite bit state as said central bit. This constraint provides an advantageous high pass characteristic to avoid large areas of channel bits of the same type.

    MULTI-DIMENSIONAL CODING ON QUASI-CLOSE-PACKET LATTICES
    77.
    发明公开
    MULTI-DIMENSIONAL CODING ON QUASI-CLOSE-PACKET LATTICES 审中-公开
    多维CODING准密封装在一起的网格

    公开(公告)号：EP1440513A1

    公开(公告)日：2004-07-28

    申请号：EP02775078.5

    申请日：2002-10-14

    申请人： Koninklijke Philips Electronics N.V.

    发明人： COENE, Willem, M., J., M.

    IPC分类号： H03M5/14 ,  G11B20/14

    CPC分类号： H03M5/145 ,  G11B7/14 ,  G11B7/24085 ,  G11B7/24088 ,  G11B20/1426

    摘要： The present invention relates to a method and system for multi-dimensionally coding and/or decoding an information to/from a lattice structure representing bit positions of said coded information in at least two dimensions. Encoding and/or decoding is performed by using a close-packed lattice structure, preferably a quasi-hexagonal lattice structure. In particular, at least partial quasi-hexagonal clusters consisting of one central bit and a plurality of nearest neighboring bits can be defined, and a code constraint can be applied such that for each of said at least partial quasi-hexagonal clusters a predetermined minimum number of said nearest neighboring bits are of the same bit state as said central bit. Thereby, intersymbol interferences can be minimized at a high code efficiency. Furthermore, another code constraint can be applied such that for each of said at least partial quasi-hexagonal clusters a predetermined minimum number of said nearest neighboring bits are of the opposite bit state as said central bit. This constraint provides an advantageous high pass characteristic to avoid large areas of channel bits of the same type.

    METHOD AND APPARATUS FOR OPERATING A CONTINUOUS TIME FILTER OF A READ/WRITE CHANNEL FOR A HARD DISK DRIVE
    78.
    发明公开
    METHOD AND APPARATUS FOR OPERATING A CONTINUOUS TIME FILTER OF A READ/WRITE CHANNEL FOR A HARD DISK DRIVE 有权
    方法和一种用于操作读/写通道的连续时间滤波器硬盘驱动器

    公开(公告)号：EP1412940A2

    公开(公告)日：2004-04-28

    申请号：EP02737115.2

    申请日：2002-05-22

    申请人： Infineon Technologies AG

    发明人： CYRUSIAN, Sasan

    IPC分类号： G11B3/00

    CPC分类号： G11B20/1426 ,  G11B20/10009

    摘要： A method and apparatus for operating a continous time filter (CTF)(128) of a read/write channel (108) for a hard disk drive (100). The apparatus includes an input muliplexer (220) that receives an analog signal (215) and transmits the analog signal (215) to a read filter (254) when the CTF (128) is in read mode and to a servo filer circuit (256) when the CTF (128) is in servo mode. The apparatus also includes an output multiplexer (222) that receives a read filter output signal (225) from the read filter circuit (254) when the CTF (128) is in read mode and a servo filter output signal (227) from the servo filter circuit (256) when the CTF (128) is in servo mode. The method includes receiving the analog signal (215) by the input miltiplexer (220) and routing the analog signal (215) to the read filter circuit (254) when the CTF (128) is in read mode and routing the analog signal (215) to the servo filter circuit (256) when the CTF (128) is in servo mode.

    METHOD OF CONVERTING A SERIES OF DATA WORDS INTO A MODULATED SIGNAL
    80.
    发明公开
    METHOD OF CONVERTING A SERIES OF DATA WORDS INTO A MODULATED SIGNAL 审中-公开
    METHOD FOR CONVERTING数据字的串联到一个调制信号

    公开(公告)号：EP1402648A1

    公开(公告)日：2004-03-31

    申请号：EP02746166.4

    申请日：2002-07-03

    申请人： LG Electronics Inc.

    发明人： SUH, Sang Woon ,  KIM, Jin Yong ,  LEE, Jae Jin ,  LEE, Joo Hyun

    IPC分类号： H03M7/00

    CPC分类号： H03M7/46 ,  G11B20/1426 ,  G11B2020/1457 ,  H03M5/145

    摘要： The present invention relates to method and apparatus of converting a series of data words into modulated signals. This method generates for each data word a number of intermediate sequences by combining mutually different digital words with that data word, scrambles these intermediate sequences to form alternative sequences, translates each alternative sequence into a (d,k) constrained sequence, measures for each (d,k) constrained sequence not only an inclusion rate of undesired sub-sequence but also a running DSV (Digital Sum Value), and selects one (d,k) constrained sequence having small inclusion rate for recording on an optical or magneto-optical recording medium among the (d,k) constrained sequences having maximum value of running DSV smaller than a preset limit. According to the present invention, efficient DSV control can be achieved for even relatively-long sequences.