发明授权
US5570248A Method and system using encoded periodic digital sum variation (DSV) as
pilot signal and controlling tracking error using crosstalk from the
pilot signal
失效
使用编码周期数字和变化（DSV）作为导频信号的方法和系统，并使用来自导频信号的串扰来控制跟踪误差
- 专利标题： Method and system using encoded periodic digital sum variation (DSV) as pilot signal and controlling tracking error using crosstalk from the pilot signal
- 专利标题（中）： 使用编码周期数字和变化（DSV）作为导频信号的方法和系统，并使用来自导频信号的串扰来控制跟踪误差
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申请号： US287918申请日： 1994-08-09
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公开(公告)号： US5570248A公开(公告)日： 1996-10-29
- 发明人: Kihei Ido , Masayuki Ohta
- 申请人： Kihei Ido , Masayuki Ohta
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX2-217624 19900818; JPX3-30839 19910226; JPX3-143457 19910614
- 主分类号： G06F13/40
- IPC分类号： G06F13/40 ; G11B5/008 ; G11B5/588 ; G11B5/592 ; G11B15/46 ; G11B15/467 ; G11B15/473 ; G11B20/14 ; G11B5/584 ; G11B5/09 ; H03M5/00 ; H03M7/00
摘要：
A data conversion method from m bits of data words into n bits of code words in recording or transmission, in which n is larger than m. A number of bit "0" arranged between one bit "1" and a next bit "1" is restricted to at most 4 in a code string of each code word, and a pair of groups of the n bits of code words corresponding to CDSs (code word digital sum) of two codes +1 and -1 are allowed to correspond to the m bits of data words. One of the two codes +1 and -1 is selectively used according to a DSV (digital sum variation) control signal to convert the m bits of data word into the n bits of code word. A pilot signal formation method using the data conversion method for obtaining a tracking error signal in a magnetic recording and reproducing apparatus, and a rotary magnetic head device for use in a magnetic recording and reproducing apparatus are also disclosed.