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61. 发明授权

US5668678A Detecting servo data and servo bursts from discrete time samples of an analog read signal in a sampled amplitude read channel 失效
标题翻译：在采样振幅读通道中从模拟读信号的离散时间采样中检测伺服数据和伺服脉冲串
公开(公告)号：US5668678A
公开(公告)日：1997-09-16
申请号：US325842
申请日：1994-11-14
申请人： David E. Reed , Richard T. Beherns , William G. Bliss
发明人： David E. Reed , Richard T. Beherns , William G. Bliss
IPC分类号： G11B5/596 , G11B21/08 , G11B21/10 , G11B5/09
CPC分类号： G11B21/083 , G11B21/085 , G11B21/106 , G11B5/59655 , G11B5/59688 , G11B20/10037 , G11B20/10055
摘要： A discrete time servo demodulation technique incorporated within a sampled amplitude read channel to demodulate embedded servo field information stored on a magnetic medium. The servo field information is transduced by a read head into an analog signal, and converted to a sequence of sample values in the read channel. The demodulation technique is responsive to the sample values and includes a discrete time peak detector for detecting servo data, and a discrete time servo burst amplitude detector for measuring the amplitude of servo bursts. Peaks are detected in the analog read signal by sensing a change of slope from the sequence of sample values. The peaks are qualified by polarity in that a peak is detected only if its polarity is opposite in sign from the previous peak. The servo burst amplitudes are measured by interpolating, rectifying, and accumulating the sequence of sample values corresponding to the servo bursts. A plurality of registers store the amplitude measurement of corresponding servo bursts such as the four servo bursts in a quadrature system. The sample values are interpolated, squared, and the sampling frequency dithered in order to decrease the sensitivity of the burst amplitude measurement to variations in the sampling phase and to increase the effective resolution of the read channel ADC for servo demodulation. Control signals are generated in response to the detected servo data which are transferred to a servo controller over a fully digital interface, thus obviating the analog-to-digital converter found in conventional servo controllers.
摘要翻译：一种并入采样振幅读通道内的离散时间伺服解调技术，用于解调存储在磁介质上的嵌入式伺服场信息。伺服字段信息由读取头转换为模拟信号，并转换为读通道中的一系列采样值。解调技术响应于采样值，并且包括用于检测伺服数据的离散时间峰值检测器和用于测量伺服脉冲串幅度的离散时间伺服脉冲串幅度检测器。通过从样本值序列感测斜率的变化，在模拟读取信号中检测峰。峰由极性限定，只有当峰的极性与前一峰的符号相反时才检测到峰。通过内插，整流和累加对应于伺服脉冲串的采样值序列来测量伺服脉冲串幅度。多个寄存器将相应伺服脉冲串的振幅测量值存储在正交系统中，例如四个伺服脉冲串。样本值被内插，平方，并且采样频率抖动，以便将脉冲串幅度测量的灵敏度降低到采样相位的变化并且增加用于伺服解调的读通道ADC的有效分辨率。响应于通过全数字接口传送到伺服控制器的检测到的伺服数据产生控制信号，从而避免了在常规伺服控制器中发现的模拟 - 数字转换器。

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