发明授权
- 专利标题： Information recording and updating method, information recording and updating apparatus, recording medium initializing apparatus and recording medium
- 专利标题（中）： 信息记录和更新方法，信息记录和更新装置，记录介质初始化装置和记录介质
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申请号： US974628申请日： 1997-11-19
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公开(公告)号： US6101051A公开(公告)日： 2000-08-08
- 发明人: Takehiro Sugita , Akira Ogino , Takashi Usui
- 申请人： Takehiro Sugita , Akira Ogino , Takashi Usui
- 申请人地址： JPX Tokyo
- 专利权人： Sony Corporation
- 当前专利权人： Sony Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX8-344663 19961209
- 主分类号： G11B20/10
- IPC分类号： G11B20/10 ; G06F21/24 ; G06K19/12 ; G07F7/02 ; G07F7/08 ; G11B25/04 ; G06K7/08
摘要：
When an information signal recorded in a magnetic card is updated by an information recording and updating apparatus, a spectrum spread signal corresponding to the updated information signal is generated and it is then recorded superimposed on to the information recorded previously in the magnetic card without erasing the old information. Since the information is spectrum spread, alteration is difficult. Moreover, the magnetic card may be discriminated whether it may be used or not by considering the old information recorded in the magnetic card when it is used.