识别卡 - 记录技术 - 第7部分:磁条 - 高矫顽力 高密度

[中文适用范围]： 本文件是描述身份证件卡片特性的一系列标准之一，并定义此类卡片在国际互操作性中的使用。本文件规定了身份证件卡片上高矫顽力磁条（包括任何防护覆盖层）的要求及编码技术。它考虑了人类和机器的各个方面，并指定了最低要求。 coercivity 对本文档中规定的许多量有影响，但本身并未指定。高矫顽力磁条的主要特性是其增强了抗擦除能力。这是通过在接触时对其他磁条造成最小概率的损坏来实现的，同时保持与 ISO/IEC 7811-2 中定义的磁条的读取兼容性。本文件为一张卡片提供了大约十倍于符合 ISO/IEC 7811-6 的卡片容量。 track 数量已增加到 6 个，每个 track 的宽度约为符合 ISO/IEC 7811-6 的(track) 宽度的一半，并且排列方式使得能够读取这些高密度 track 的读卡器也可以读取符合 ISO/IEC 7811-2 和 ISO/IEC 7811-6 的卡片。数据以 8 位字节的形式使用 MFM 编码技术进行编码。使用数据帧限制错误传播，并且错误校正技术进一步提高了读取的可靠性。本 ISO/IEC 7811 系列标准的目的是为卡片提供性能准则。这些标准不考虑卡片在测试之前可能经历的任何使用量。如果不符合指定的标准，由相关方协商解决。ISO/IEC 10373-2 规定了用于检查符合本文件规定的参数的卡片测试程序。注意：本文档中的 SI 和/或英制测量系统的数字值可能是四舍五入的，并且彼此一致但不完全相等。使用任一系统是正确的，但交错或重新转换值可能会导致错误。原始设计基于英制测量系统。 [外文原描述]： This document is one of a series of standards describing the characteristics for identification cards as defined in the definitions clause and the use of such cards for international interchange. This document specifies requirements for a high coercivity magnetic stripe (including any protective overlay) on an identification card and encoding technique. It takes into consideration both human and machine aspects and states minimum requirements. Coercivity influences many of the quantities specified in this document but is not itself specified. The main characteristic of the high coercivity magnetic stripe is its improved resistance to erasure. This is achieved with minimal probability of damage to other magnetic stripes by contact while retaining read compatibility with magnetic stripes as defined in ISO/IEC 7811-2. This document provides for a card capacity of approximately 10 times that of a card conforming to ISO/IEC 7811-6. The number of tracks has been increased to 6, each track being approximately half the width of tracks conforming to ISO/IEC 7811-6, located so that readers designed to read these high density tracks will also be able to read cards conforming to ISO/IEC 7811-2 and ISO/IEC 7811-6. Data is encoded in 8 bit bytes using the MFM encoding technique. Data framing is used to limit error propagation and error correction techniques further improve reliability of reading. It is the purpose of the ISO/IEC 7811 series of standards to provide criteria to which cards shall perform. No consideration is given within these standards to the amount of use, if any, experienced by the card prior to test. Failure to conform to specified criteria is negotiated between the involved parties. ISO/IEC 10373-2 specifies the test procedures used to check cards against the parameters specified in this document. NOTE Numeric values in the SI and/or Imperial measurement system in this document may have been rounded off and are consistent with, but not exactly equal to each other. Using either system is correct but intermixing or reconverting values can result in errors. The original design was made using the Imperial measurement system.