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21. 发明授权

US4802031A Tracking control using signals reproduced by erase head 失效
标题翻译：使用由擦除头再现的信号进行跟踪控制
公开(公告)号：US4802031A
公开(公告)日：1989-01-31
申请号：US875330
申请日：1986-06-17
申请人： Kenichi Nagasawa , Hiroyuki Takimoto , Mitsuhiro Otokawa , Hiroo Edakubo , Susumu Kozuki , Keiji Satoh
发明人： Kenichi Nagasawa , Hiroyuki Takimoto , Mitsuhiro Otokawa , Hiroo Edakubo , Susumu Kozuki , Keiji Satoh
IPC分类号： G11B15/467 , G11B5/584
CPC分类号： G11B15/4678
摘要： There is disclosed an information signal reproducing apparatus for reproducing information signals from a magnetic record bearing medium on which information signals are recorded with pilot signals of four different frequencies recurrently superimposed thereon. The apparatus comprises magnetic heads which are arranged to reproduce said information signals and said pilot signals by tracing said magnetic record bearing medium and an erasing head which is arranged to trace said magnetic record bearing medium in equal tracing direction to that of said magnetic heads and which is able to erase at least the information signals recorded on said magnetic record bearing medium and to reproduce said pilot signals. At the time of controlling a tracing position of said magnetic heads relative to said magnetic record bearing medium, four local pilot signals having the same frequencies as those of said pilot signals, respectively, are recurrently generated in a predetermined rotation. The state of said pilot signals reproduced by said magnetic heads is monitored, using said four local pilot signals and the tracing position on said medium of said magnetic heads is controlled, depending upon the state of said pilot signals. The level of a specific pilot signal from among said pilot signals reproduced by said erasing head is detected and the generating sequence of the local pilot signals is changed over, depending upon a result of such detention. According to such construction it is possible to effect the tracking control with high precision and high response speed.
摘要翻译：公开了一种信息信号再现装置，用于从其中记录信息信号的磁记录承载介质再现信息信号，其中循环叠加有四个不同频率的导频信号。该装置包括磁头，其被布置成通过跟踪所述磁记录载体介质和擦除头来再现所述信息信号和所述导频信号，所述擦除头被布置成以与所述磁头相同的跟踪方向跟踪所述磁记录载体介质，并且能够至少擦除记录在所述磁记录载体介质上的信息信号并再现所述导频信号。在控制所述磁头相对于所述磁记录承载介质的跟踪位置时，分别具有与所述导频信号相同频率的四个本地导频信号以预定的旋转方式产生。使用所述四个本地导频信号监视由所述磁头再现的所述导频信号的状态，并且根据所述导频信号的状态来控制所述磁头的所述介质上的跟踪位置。检测由所述擦除头重放的所述导频信号中的特定导频信号的电平，并根据这种拘留的结果改变本地导频信号的生成顺序。根据这种结构，可以以高精度和高响应速度实现跟踪控制。

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