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1. 发明授权

US5354975A Contactless data processing apparatus 失效
标题翻译：非接触式数据处理装置
公开(公告)号：US5354975A
公开(公告)日：1994-10-11
申请号：US70789
申请日：1993-06-03
申请人： Yoshihito Ishibashi , Masakatsu Matsumoto , Shin-ichi Hayakawa
发明人： Yoshihito Ishibashi , Masakatsu Matsumoto , Shin-ichi Hayakawa
IPC分类号： G06K7/00 , G07B15/02 , G06K5/00 , G06F11/00 , H04K1/00
CPC分类号： G06K7/0008 , G06Q20/367 , G07B15/02
摘要： When a control section of a data carrier discriminates a command from a reader/writer, either one of two kinds of pseudo random signals is returned in accordance with a bit 0 or 1 of response data. When two autocorrelation values obtained by correlation arithmetic operations are simultaneously equal to or greater than a predetermined threshold value, the reader/writer determines that a communication has been executed with two or more data carriers, so that an error warning, an access stop, a retry, or the like is executed. The reader/writer compares the autocorrelation peak value obtained from the pseudo random signal from the data carrier with a threshold value. When it is equal to or greater than the threshold value, the reading operation is executed. In the reading operation of continuous data bits from the data carrier, the reader/writer selects the minimum value from among the autocorrelation peak values of the bits obtained by the correlation arithmetic operations and stores the selected minimum value. When the minimum memory value is smaller than a threshold value, it is determined that data could not correctly be read, so that an error is indicated.
摘要翻译：当数据载体的控制部分识别来自读/写器的命令时，根据响应数据的位0或1返回两种伪随机信号中的任一种。当通过相关算术运算获得的两个自相关值同时等于或大于预定阈值时，读取器/写入器确定已经用两个或更多个数据载体执行通信，使得错误警告，访问停止，重试等。读取器/写入器将从数据载体的伪随机信号获得的自相关峰值与阈值进行比较。当其等于或大于阈值时，执行读取操作。在来自数据载体的连续数据位的读取操作中，读取器/写入器从通过相关算术运算获得的位的自相关峰值中选择最小值，并存储所选择的最小值。当最小存储器值小于阈值时，确定数据无法正确读取，从而指示错误。

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