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    • 7. 发明申请
    • METHODS AND APPARATUS FOR INCREASED MAGNETIC CODING DENSITY BY PRECISE PLACEMENT OF MAGNETIC TRANSITIONS
    • 通过精密放置磁性转换提高磁性编码密度的方法和装置
    • WO01084543A2
    • 2001-11-08
    • PCT/US2001/013531
    • 2001-04-26
    • G06K1/00G06K1/12G06K7/08G06K19/06G06K19/12G11B5/09G11B20/10G11B20/12G11B20/14G11B
    • G06K19/06187G06K1/125G06K7/084G06K19/12
    • Methods and apparatus for increasing the density of data storage on a magnetic medium by using variations in positioning of magnetic transitions to encode bits. Conventionally encoded bits are written to the medium as sequences of magnetic transitions according to an encoding standard. Additional bits are encoded on the medium as deviations from a nominal position of magnetic transitions separating conventionally encoded bits. The deviation from the nominal position is within an allowable range of tolerance for the standard followed in encoding the conventionally encoded bits. In order to prevent accumulation of error, additional bits are only encoded in transitions separating a pair of conventionally encoded bits. The first and last transitions of the pair do not have additional bits encoded as deviations of transition locations. This technique allows the encoding of one additional bit for every two conventionally encoded bits.
    • 通过使用磁转变位置的变化来对位进行编码来增加磁介质上的数据存储密度的方法和装置。 常规编码比特根据编码标准被写入到介质中作为磁转换序列。 附加位在介质上编码,作为与常规编码位分离的磁转换的标称位置的偏差。 与标准位置的偏差在编码常规编码位之后的标准容许范围内。 为了防止错误的累积,附加位仅在分离一对常规编码位的转换中进行编码。 该对的第一个和最后一个转换没有编码为转换位置的偏差的额外的位。 该技术允许对于每两个常规编码的比特来编码一个附加比特。
    • 10. 发明申请
    • DATA MEDIA
    • 数据媒体
    • WO01011557A1
    • 2001-02-15
    • PCT/RU2000/000306
    • 2000-07-21
    • G06K19/16G06K19/06G06K19/12G06K19/14G06K19/18
    • G06K19/06037G06K19/06046G06K19/12G06K19/14
    • The invention relates to data media, whereby various data protection techniques may be used during the production of said data media in order to protect the data media against unauthorized copies or tampering. The data medium (1) is a multilayer structure carrying graphic and alphanumeric information (8) and made from a thin layer material, which includes at least one layer (4) comprising an identification area (7), whereby said area is divided into segments which are transparent with respect to light (10), allow for modulation of the light flow and are limited by the limiting strips (11). Said strips, discrete or continuous, are made of a material which is non transparent with respect to light flow throughout the entire thickness or a part thereof. The ratio between the thickness of the limiting strip (11) and the distance separating the opposing limiting strips inside one segment (10) of the identification area (7), is comprised between 0.01 and 1, whereby the thickness of the limiting strip (11) is comprised between 0.1 and 1 micrometers. In the cross-section, the limiting strip (11) defining the segments (10) of the identification area (7) represents a geometrical figure comprised between the lines of a secondary order.
    • 本发明涉及数据介质,由此在生产所述数据介质期间可以使用各种数据保护技术,以保护数据介质免受未经授权的拷贝或篡改。 数据介质(1)是承载图形和字母数字信息(8)并由薄层材料制成的多层结构,薄层材料包括至少一个包括识别区域(7)的层(4),由此所述区域被划分成段 其相对于光(10)是透明的,允许光流的调制并受限制条(11)的限制。 分离或连续的所述条由相对于整个厚度或其一部分的光流不透明的材料制成。 限制条(11)的厚度与将识别区域(7)的一个段(10)内的相对的限制条分隔开的距离之间的比率在0.01和1之间,由此限制条(11 )为0.1〜1微米。 在横截面中,限定识别区域(7)的段(10)的限制条(11)表示包括在次级顺序的线之间的几何图形。