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    • 5. 发明授权
    • Simplified encoding apparatus and method for pilot tone modulation in
automatic-track-following
    • 用于自动跟踪跟踪中的导频音调制的简化编码装置和方法
    • US5668545A
    • 1997-09-16
    • US494821
    • 1995-06-26
    • Tian-Rein Chen
    • Tian-Rein Chen
    • G11B5/588G11B15/46G11B20/14G11B21/10H03M5/14H03M7/00
    • G11B5/588G11B20/1426H03M5/145G11B15/463G11B2020/1449G11B21/10
    • A 24/25 modulation encoding device for generating a power spectrum of a binary sequence using spectrum peak and notch power monitoring (SPNPM) modulation is disclosed in this invention. The encoding device includes a dual polarity up-down counter for generating digitized step functions for replacing sine and cosine functions recruited by the SPNPM modulation. The encoding device further includes a bit shifter and an accumulator for generating an estimator of expectation for approximating a real and an imaginary part of a work value for obtaining a power spectrum required by the SPNPM modulation. The encoding device further includes an absolute accumulator for receiving said estimator of expectation approximating said real and imaginary parts of said work value for generating an absolute work value to replace a work-square value required for generating a power spectrum. The encoding device further includes a linear circuit with an input terminal designated as a DC terminal looping back for extra-weighting an input therefrom. The encoding device further includes a comparator coupled to said linear sum circuit for determining a smaller sum value for monitoring a notch required by the SPNPM modulation for reducing circuit complexity of the encoding device.
    • 本发明公开了一种使用频谱峰值和陷波功率监测(SPNPM)调制来生成二进制序列的功率谱的24/25调制编码装置。 编码装置包括用于产生用于替换由SPNPM调制所招募的正弦和余弦函数的数字化步骤功能的双极性上调计数器。 编码装置还包括位移器和累加器,用于产生用于近似用于获得SPNPM调制所需的功率谱的工作值的实部和虚部的期望值的估计器。 所述编码装置还包括绝对累加器,用于接收所述估计器,所述估计器预期近似所述工作值的所述实部和虚部以产生绝对工作值,以替代产生功率谱所需的工作平方值。 编码装置还包括一个线性电路,其中一个输入端被指定为一个直流端回路,用于对其输入进行加权。 编码装置还包括耦合到所述线性和电路的比较器,用于确定用于监视SPNPM调制所需的陷波的较小和值,以降低编码装置的电路复杂度。
    • 6. 发明授权
    • Encoding and decoding techniques for data in 24 bit sequence
    • 24位序列数据的编码和解码技术
    • US06288655B1
    • 2001-09-11
    • US09394789
    • 1999-09-13
    • Kinhing P. TsangBernardo Rub
    • Kinhing P. TsangBernardo Rub
    • H03M746
    • H04L25/4917G11B20/1426G11B2020/1449G11B2220/2516H03M7/20
    • Encoding and decoding systems and methods for digital data in 24 bit sequences. An encoder generates state variables as a function of four or fewer bits of the 24 bit sequence, and encodes the sequence into 11 and 14 bit codewords. After transmission, the 11 bit and 14 bit codewords are decoded using recovered state variables. The encoding places a run length limit (RLL) of k=7 on a 25 bit codeword comprised of the 11 and 14 bit codewords to limit runs of zeros. Each of the 11 bit and 14 bit codewords are preferably also encoded with a run length limit of interleaved bits is i=7. The encoding and decoding systems and methods can be applied to a magnetic disc drive.
    • 24位序列中数字数据的编码和解码系统和方法。 编码器根据24位序列的四位或更少比特生成状态变量,并将序列编码为11位和14位代码字。 在传输之后,使用恢复的状态变量解码11位和14位码字。 该编码在由11位和14位码字组成的25位码字上设置k = 7的游程长度限制(RLL),以限制零的运行。 11比特和14比特码字中的每一个优选地也被编码,交织比特的游程长度限制是i = 7。编码和解码系统和方法可以应用于磁盘驱动器。