公开(公告)号：US4019145A

公开(公告)日：1977-04-19

申请号：US699282

申请日：1976-06-24

申请人： John C. Rathe

发明人： John C. Rathe

IPC分类号： G01P3/44 ,  H03D3/18 ,  H03K1/16

CPC分类号： G01P3/44 ,  H03D3/18

摘要： Rate of change of the angle .theta. conveyed by a three-wire synchro signal is developed as an inherently normalized signal (d.theta./dt) by dividing N sin .theta. (d.theta./dt) signals by N sin .theta. signals and N cos .theta. (d.theta./dt) signals by N cos .theta. signals over selected ones of contiguous segments of a full 360.degree. range of .theta. where the divisor signals do not go through zero. The N sin .theta. and N cos .theta. signals are normalized outputs of dividers which divide synchro carrier reference demodulated sin .theta. and cos .theta. signals by a synchro carrier reference level signal. N sin .theta. and N cos .theta. signals are differentiated to derive the N sin (d.theta./dt) and N cos .theta. (d.theta./dt) signals. Logic circuitry switches appropriately signed ones of the signals as divisor and dividend inputs to an output divider whose output is (d.theta./dt) and is independent of synchro carrier level, synchro transformation ratios, phase shift between the synchro X-Y-Z voltages and the synchro carrier reference, and synchro carrier reference waveform distortion.

摘要翻译： 由三线同步信号传送的角度θ的变化率通过将Nsinθ（dθ/ dt）信号除以Nsinθ信号和Ncosθ（dθ/ dt）信号而被形成为固有归一化的信号（dθ/ dt） dθ/ dt）信号，通过Ncosθ信号在除数信号不通过零的全360度θ范围的连续段的选定的一个区域上。 Nsinθ和Ncosθ信号是通过同步载波参考电平信号划分同步载波参考解调的sinθ和cosθ信号的分频器的归一化输出。 Nsinθ和Ncosθ信号被微分以导出N sin（dθ/ dt）和Ncosθ（dθ/ dt）信号。 逻辑电路将合适的符号信号作为除数和除数输入切换到输出为（dθ/ dt）并且与同步载波电平，同步变换比，同步XYZ电压和同步载波之间的相移的输出分频器 参考和同步载波参考波形失真。

公开(公告)号：US07248557B2

公开(公告)日：2007-07-24

申请号：US10749163

申请日：2003-12-30

申请人： Johannes J. Verboom ,  John C. Rathe

发明人： Johannes J. Verboom ,  John C. Rathe

IPC分类号： G11B7/24

CPC分类号： G11B27/3027 ,  G11B7/00745 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/20

摘要： For the purpose of providing sector-address information on optical disks, a robust header is realized by utilizing a very simple encoding method that allows asynchronous reading. In order to provide robustness and reliability, the header uses a biphase data format to encode addressing information. The embossed header is further configured with redundant address-fields in a checkerboard pattern between adjacent tracks, in order to provide robustness for media-contamination. Each address-field starts with a unique address-mark and ends with parity-check information to provide reliable error-detection. The entire header can be decoded without the need for a slice-level, thus making it very tolerant to amplitude-variations and DC-offset variations. By combining these characteristics, a header is achieved which is reliable and inherently resistant to failures in providing sector-address information on optical disks.

摘要翻译： 为了在光盘上提供扇区地址信息，通过使用允许异步读取的非常简单的编码方法来实现鲁棒报头。 为了提供鲁棒性和可靠性，报头使用双相数据格式来编码寻址信息。 压印头还被配置有相邻轨道之间棋盘图案中的冗余地址字段，以便为媒体污染提供鲁棒性。 每个地址字段以唯一的地址标记开始，并以奇偶校验信息结束，以提供可靠的错误检测。 整个报头可以被解码而不需要一个片级，因此使得它非常容忍幅度变化和直流偏移变化。 通过组合这些特征，实现了一种头部，其可靠并且固有地抵抗在光盘上提供扇区地址信息的故障。