Data conversion method, pilot signal formation method using the same
rotary magnetic head device for use therein
    3.
    发明授权
    Data conversion method, pilot signal formation method using the same rotary magnetic head device for use therein 失效
    数据转换方法,使用相同的旋转磁头装置的导频信号形成方法

    公开(公告)号:US5852520A

    公开(公告)日:1998-12-22

    申请号:US690564

    申请日:1996-07-31

    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.

    摘要翻译: 一种将数据字的m位数据转换成n个大于m的码字的n位的数据转换方法。 在每个代码字的代码串中,在一个位“1”和下一个位“1”之间布置的位数“0”被限制在最多4个,并且对应于 允许两个代码+1和-1的CDS(码字数字和)对应于数据字的m位。 根据DSV(数字和变化)控制信号,有选择地使用两个代码+1和-1中的一个,以将数据字的m位转换成码字的n位。 还公开了一种使用用于获得磁记录和再现装置中的跟踪误差信号的数据转换方法的导频信号形成方法和用于磁记录和再现装置的旋转磁头装置。

    Method and system using encoded periodic digital sum variation (DSV) as
pilot signal and controlling tracking error using crosstalk from the
pilot signal
    4.
    发明授权
    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

    公开(公告)号:US5570248A

    公开(公告)日:1996-10-29

    申请号:US287918

    申请日:1994-08-09

    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.

    摘要翻译: 一种将数据字的m位数据转换成n个大于m的码字的n位的数据转换方法。 在每个代码字的代码串中,在一个位“1”和下一个位“1”之间布置的位数“0”被限制在最多4个,并且对应于 允许两个代码+1和-1的CDS(码字数字和)对应于数据字的m位。 根据DSV(数字和变化)控制信号,有选择地使用两个代码+1和-1中的一个,以将数据字的m位转换成码字的n位。 还公开了一种使用用于获得磁记录和再现装置中的跟踪误差信号的数据转换方法的导频信号形成方法和用于磁记录和再现装置的旋转磁头装置。

    Data conversion apparatus and encoding apparatus
    6.
    发明授权
    Data conversion apparatus and encoding apparatus 失效
    数据转换装置和编码装置

    公开(公告)号:US5602547A

    公开(公告)日:1997-02-11

    申请号:US328919

    申请日:1994-10-25

    IPC分类号: G11B20/14 H03M7/14 G11B5/09

    CPC分类号: G11B20/1426

    摘要: A data conversion apparatus which converts an m-bit data into plural n-bit codes having different CDS values to obtain an intense spectrum at frequencies with a period of p bits has a CDS control signal generator which generates data of a known CDS in codeword with one period which is the least common multiple (q) of n and p, an error detector which detects differences between values of charge in codeword at intervals of (r) bits (where r is the greatest common divisor of n and p) and the data of the known CDS in codeword and detects a sum of absolute values (.DELTA.CDS) of the differences, and a minimum value hold circuit which selects a code having the smallest sum of absolute values (.DELTA.CDS), from the plural n-bit codes having different CDS values.

    摘要翻译: 将m比特数据转换为具有不同CDS值的多个n比特码以获得具有p比特周期的频率的强频谱的数据转换装置具有CDS控制信号发生器,其生成码字中已知CDS的数据, 一个周期是n和p的最小公倍数(q),一个误差检测器,以(r)比特(其中r是n和p的最大公约数)的间隔检测码字中的电荷值之间的差异, 已知CDS在码字中的数据,并且检测差异的绝对值(DELTA CDS)之和,以及最小值保持电路,其从多个n位选择具有最小绝对值之和(DELTA CDS)的代码 具有不同CDS值的代码。

    Apparatus for reproducing multiple track digital signals and including
timing control of read/write operations
    7.
    发明授权
    Apparatus for reproducing multiple track digital signals and including timing control of read/write operations 失效
    用于再现多轨迹数字信号并包括读/写操作的定时控制的装置

    公开(公告)号:US4636877A

    公开(公告)日:1987-01-13

    申请号:US674926

    申请日:1984-11-07

    申请人: Kihei Ido

    发明人: Kihei Ido

    摘要: An apparatus for reproducing digital signals on a multi-track recording medium, wherein a signal to be written in a memory is selected from among signals of each track demodulator a demodulation means (50) by a writing track selection circuit (200), the signal of the writing track selected by the track selection circuit (200) is stored in a memory (102), the timing of writing the signal of the selected track is determined by a write timing setup circuit (300), and the timing of reading is determined by a read setup circuit (400) so that the signal stored in the memory (102) is read out during two write timing periods set by the write timing setup circuit (300), and the memory (102) is directed for writing or reading selectively by a read/write selector (100) in accordance with the output signals from the write timing setup circuit (300) and read setup circuit (400), so that writing or reading takes place at an interval of 1/2ANfc.

    摘要翻译: PCT No.PCT / JP84 / 00242 Sec。 371日期1984年11月7日 102(e)1984年11月7日日期PCT提交日期1984年5月15日PCT公布。 出版物WO84 / 04622 日期:1984年11月22日。一种用于在多轨记录介质上再现数字信号的装置,其中通过写入轨道选择从每个轨道解调器的信号中选择要写入存储器的信号解调装置(50) 电路(200)中,由磁道选择电路(200)选择的写入磁道的信号被存储在存储器(102)中,写入定时设置电路(300)确定所选磁道的信号的写入定时, 并且读取定时由读取设置电路(400)确定,使得存储在存储器(102)中的信号在由写入定时设置电路(300)设置的两个写入定时周期期间被读出,并且存储器 102)根据来自写入定时设置电路(300)和读取建立电路(400)的输出信号由读/写选择器(100)选择性地进行写入或读取,使得写入或读取在 间隔1 / 2ANfc。

    Data conversion device and recording/reproduction apparatus
    9.
    发明授权
    Data conversion device and recording/reproduction apparatus 失效
    数据转换装置和记录/再现装置

    公开(公告)号:US5432651A

    公开(公告)日:1995-07-11

    申请号:US73322

    申请日:1993-06-08

    IPC分类号: G11B15/46 G11B20/14 G11B5/09

    CPC分类号: G11B20/1426 G11B15/463

    摘要: M sets of digital data obtained by adding a control bit to an n-bit data string are collected to generate 2.sup.m kinds of m(n+1)-bit data strings, with I-NRZI modulation being applied to these data strings to generate m kinds of I-NRZI modulated data strings and the I-NRZI modulated data strings are subject to spectrum analysis for the desired frequency components, in order to supply one of the I-NRZI modulated data strings as a recording signal based on the result of the spectrum analysis.

    摘要翻译: 收集通过将控制位添加到n位数据串而获得的M组数字数据,以产生2m种m(n + 1)位数据串,其中I-NRZI调制被应用于这些数据串以产生m 将I-NRZI调制数据串和I-NRZI调制数据串的种类进行所需频率分量的频谱分析,以便基于I-NRZI调制数据串的结果将I-NRZI调制数据串中的一个作为记录信号提供 频谱分析。

    Data conversion method, pilot signal formation method using the same and
rotary magnetic head device for use therein
    10.
    发明授权
    Data conversion method, pilot signal formation method using the same and rotary magnetic head device for use therein 失效
    数据转换方法,使用其的导频信号形成方法和旋转磁头装置

    公开(公告)号:US5365232A

    公开(公告)日:1994-11-15

    申请号:US120857

    申请日:1993-08-31

    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.

    摘要翻译: 一种将数据字的m位数据转换成n个大于m的码字的n位的数据转换方法。 在每个代码字的代码串中,在一个位“1”和下一个位“1”之间布置的位数“0”被限制在最多4个,并且对应于 允许两个代码+1和-1的CDS(码字数字和)对应于数据字的m位。 根据DSV(数字和变化)控制信号,有选择地使用两个代码+1和-1中的一个,以将数据字的m位转换成码字的n位。 还公开了一种使用用于获得磁记录和再现装置中的跟踪误差信号的数据转换方法的导频信号形成方法和用于磁记录和再现装置的旋转磁头装置。