公开(公告)号：US4743982A

公开(公告)日：1988-05-10

申请号：US910706

申请日：1986-09-23

申请人： Bonifacio Troletti

发明人： Bonifacio Troletti

IPC分类号： G11B20/14 ,  G11B5/09

CPC分类号： G11B20/1419 ,  G11B20/1423

摘要： A digital data separator for use with apparatus for recovering binary information recorded on a movable media in frequency modulation (FM) or modified frequency modulation (MFM) comprises a measurement unit which for each read pulse received as an input provides a code representing the actual duration of an interval N between read pulse n and the preceding read pulse n-1 and a speed error correction unit which corrects an actual interval duration relative to the speed error of the movable media. The separator further includes a peak-shift recovery unit which provides as an output, nominal duration information related to interval N based on the corrected interval duration and on the peak-shift of pulse n-1, determined by taking into account the corrected duration of an interval N-1, a preceding interval N, and the nominal duration of intervals N-1 and N-2 preceding interval N.

摘要翻译： 一种用于在频率调制（FM）或修改频率调制（MFM）中记录在可移动介质上的二进制信息的装置的数字数据分离器包括：测量单元，对于作为输入接收到的每个读取脉冲，提供表示实际持续时间的代码 在读取脉冲n和前一个读取脉冲n-1之间的间隔N的速度误差校正单元，其相对于可移动介质的速度误差校正实际间隔持续时间。 分离器还包括峰值移位恢复单元，其提供基于校正的间隔持续时间和脉冲n-1的峰值偏移与间隔N相关的标称持续时间信息，其通过考虑校正的持续时间来确定 间隔N-1，前一间隔N，间隔N的间隔N-1和N-2的标称持续时间。

公开(公告)号：US4714968A

公开(公告)日：1987-12-22

申请号：US835415

申请日：1986-03-03

申请人： Bonifacio Troletti

发明人： Bonifacio Troletti

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B5/09

CPC分类号： G11B20/1419 ,  G11B20/1423

摘要： A digital apparatus for data recovery system wherein data is recorded in FM or MFM code on magnetic media, comprises a measuring unit that in correspondence of a read pulse n as an input, supplies as an output, information related to the actual duration of interval N between pulse n and the previous read pulse n-1. A recovery unit for the magnetic media speed error relative to a nominal speed corrects the duration according to a code representative of the magnetic media speed error and a peak shift recovery unit which, according to the peak shift of pulse n-1, determined on the basis of the time history of the most recent pulses n-2, n-3, n-1 and the corrected duration, supplies as an output, nominal duration information related to this corrected duration and information representative of the direction and the amount of the peak shift of said read out pulse N-7. A measuring unit of speed error defines a code representative of the error as a function of the peak shift direction of a suitable number of subsequent read out pulses and a previously measured speed error which is fed to the speed error recovery unit. The nominal duration information is applied to the input of a logic unit for generating a "window" signal and reconstructing the read pulse in suitable phase relationship with the window signal.

摘要翻译： 一种用于数据恢复系统的数字装置，其中数据以磁性介质上的FM或MFM代码记录，包括测量单元，其对应于作为输入的读取脉冲n提供输出，与间隔N的实际持续时间相关的信息 在脉冲n和先前的读取脉冲n-1之间。 用于相对于标称速度的磁性介质速度误差的恢复单元根据代表磁介质速度误差的代码来修正持续时间，并且根据脉冲n-1的峰值偏移确定的峰值移位恢复单元 最新脉冲n-2，n-3，n-1和校正持续时间的时间历史的基础提供与该校正持续时间相关的标称持续时间信息和代表该修正持续时间的方向和数量的信息 所述读出脉冲N-7的峰值偏移。 速度误差的测量单元将代表误差的代码定义为适当数量的后续读出脉冲的峰值偏移方向和被馈送到速度误差恢复单元的先前测量的速度误差的函数。 标称持续时间信息被施加到用于产生“窗口”信号的逻辑单元的输入并且以与窗口信号适当的相位关系重建读取脉冲。

公开(公告)号：US4742403A

公开(公告)日：1988-05-03

申请号：US911022

申请日：1986-09-23

申请人： Bonifacio Troletti

发明人： Bonifacio Troletti

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B5/09

CPC分类号： G11B20/10212 ,  G11B20/1419 ,  G11B20/1423

摘要： A digital data separator for use with apparatus for recovering binary information recorded in FM or MFM on magnetic media comprises a measuring unit which in correspondence with a read pulse n, supplies information representative of the actual duration of interval N between pulse n and the previous read pulse n-1. A media speed error recovery unit corrects such duration relative to the nominal speed according to a code representative of the media speed error, a peak-shift recovery unit which depending on the peak-shift of pulse n-1, determined on the basis of the temporal history of the most recent pulses n-3, n-2 and n-1 of such corrected duration, supplies duration information related to such interval and information representative of the direction and the entity of the peak-shift of the read out pulse n, and a speed error measuring unit defines a code representative of such error as the difference between the actual duration of a period consisting of a suitable number of subsequent intervals between read pulses and their nominal duration. This duration is corrected relative to the peak-shift of the pulses defining the beginning and the end of the period and is further "normalized" according to the nominal duration of the period. The speed error code is applied to the speed error recovery unit. The nominal duration of interval N is applied to a logic unit which generates a "window" signal and reconstructs the read pulse in a suitable phase relationship with the window signal.

摘要翻译： 用于恢复在磁介质上记录在FM或MFM中的二进制信息的装置的数字数据分离器包括与读取脉冲n相对应的测量单元，提供表示脉冲n与先前读取之间的间隔N的实际持续时间的信息 脉冲n-1。 介质速度误差恢复单元根据表示介质速度误差的代码来校正相对于标称速度的持续时间，峰值移位恢复单元取决于脉冲n-1的峰值偏移，该峰值移位恢复单元基于 提供这种校正持续时间的最新脉冲n-3，n-2和n-1的时间历史，提供与这种间隔有关的持续时间信息，以及表示读出脉冲n的峰值移位的方向和实体的信息 ，并且速度误差测量单元定义代表这样的误差的代码，即由读取脉冲之间的适当数量的后续间隔与其标称持续时间组成的周期的实际持续时间之间的差异。 该持续时间相对于限定周期的开始和结束的脉冲的峰值偏移被校正，并且根据周期的标称持续时间进一步“归一化”。 速度误差代码被应用于速度误差恢复单元。 间隔N的标称持续时间被施加到产生“窗口”信号的逻辑单元，并以与窗口信号适当的相位关系重建读取脉冲。

公开(公告)号：US4672482A

公开(公告)日：1987-06-09

申请号：US659112

申请日：1984-10-09

申请人： Bonifacio Troletti

发明人： Bonifacio Troletti

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B5/09

CPC分类号： G11B20/10212 ,  G11B20/1419 ,  G11B20/1423

摘要： A digital apparatus recovers data recorded in FM or MFM on a magnetic media moving at a normal speed in which the reading of the media provides a sequence of timing/data pulses at variable intervals, which differ from a nominal interval due to speed error and magnetic "peak-shift". The apparatus provides identification of a nominal interval between read out pulses and the reconstruction of a correct stream of pulses properly located within a window signal. It includes a digital measurement unit which at each read out pulse n received in input supplies at an output a code indicative of the actual duration of the interval N between the pulse n and a previous pulse n-1; and a speed correction unit which corrects the measured duration of the interval N relative to speed error detected by the digital measurement unit during reading of a synchronization bit field. A peak shift correction unit included within the apparatus utilizing the corrected interval duration, and for MFM recording, the previous most recent history of received pulses establishes a nominal duration for the interval N. The nominal duration attributed to interval N is used by a regeneration unit to produce a suitable window signal and a regenerated pulse corresponding to the read out n pulse which is properly located within the window signal.

摘要翻译： 数字设备恢复在以正常速度移动的磁性介质上记录的FM或MFM中的数据，其中介质的读取以可变间隔提供定时/数据脉冲序列，其与由于速度误差和磁性的标称间隔不同 “高峰”。 该装置提供读出脉冲之间的标称间隔的识别以及正确位于窗口信号内的正确的脉冲流的重构。 它包括一个数字测量单元，每个读出脉冲在输入端输入一个代表脉冲n与先前脉冲n-1之间间隔N的实际持续时间的代码; 以及速度校正单元，其在读取同步位字段期间校正所测量的间隔N的持续时间相对于由数字测量单元检测到的速度误差。 包括在利用校正间隔持续时间的设备内的峰值偏移校正单元，并且对于MFM记录，接收脉冲的先前最近的历史建立间隔N的标称持续时间。归因于间隔N的标称持续时间由再生单元 以产生对应于正好位于窗口信号内的读出n个脉冲的合适的窗口信号和再生脉冲。