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1.发明授权
公开(公告)号：US4298898A
公开(公告)日：1981-11-03
申请号：US31458
申请日：1979-04-19
申请人： Claude R. Cardot
发明人： Claude R. Cardot
CPC分类号： G11B27/105 , G11B5/012
摘要： A magnetic head reads data from reference zones on tracks at differing ra of a magnetic memory disc rotating at constant angular velocity. Each track includes at least one reference zone, each of which includes a plurality of initial cells. Each cell has magnetic flux variations, which when read by the head result in a first waveform that includes undulations enabling the head to be properly servo controlled to a position over the center of the track and a further undulation that is distinguishable from the head positioning undulations. The initial cells are followed by plural binary bit representing data cells each having magnetic flux variations which when read by the head result in a second waveform including a data representing undulation that is generally the same amplitude as the further undulations. The undulations are susceptible to having varying amplitudes as the head is positioned at different positions of the disc. The peak amplitude of the further undulations, for one reference zone, is detected. In response to the detected peak amplitude of the further undulations a threshold for the data representing undulations is set and maintained while the second waveforms for the cells of the reference zone are read by the head. The set threshold and amplitude of the second waveforms are compared to enable the binary value of each data cell to be determined. A feedback look controls the gain of an amplifier that derives the signal to be detected for peak amplitude, except immediately after a change is ordered for a transition to read data from heads on opposite faces of the disc, at which time the gain is maximized.
摘要翻译： 磁头以恒定角速度旋转的磁记录盘的不同半径的轨道上的参考区读取数据。 每个轨道包括至少一个参考区域，每个参考区域包括多个初始单元。 每个单元都具有磁通量变化，当磁头读数导致第一波形包括波动时，可以将磁头适当地伺服控制到轨道中心的位置，并且还可以与磁头定位波动区分开来 。 初始单元之后是表示具有磁通量变化的数据单元的多个二进制位，当磁头读取时，该第二波形包括第二波形，该第二波形包括与其它波动通常大致相同振幅的波形数据。 当头部位于盘的不同位置时，起伏容易具有变化的幅度。 检测到一个参考区域的进一步起伏的峰值幅度。 响应于检测到的另外波动的峰值幅度，在头部读取参考区域的单元的第二波形时，设置和维持表示波动的数据的阈值。 将第二波形的设定阈值和振幅进行比较，以确定每个数据单元的二进制值。 反馈外观控制放大器的增益，该放大器导出要检测的峰值幅度的信号，除了在对盘的相对面上的磁头进行转换以读取数据的转换进行更改之后立即进行控制，此时增益最大化。
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2.发明授权Method of and apparatus for determining errors read from a magnetic recording medium 失效用于确定从磁记录介质读取的误差的方法和装置
公开(公告)号：US4271522A
公开(公告)日：1981-06-02
申请号：US42299
申请日：1979-05-25
申请人： M. Jacques Droux , Claude R. Cardot
发明人： M. Jacques Droux , Claude R. Cardot
CPC分类号： G11B20/18
摘要： Errors in reading data with a magnetic head from reference zones on trackst differing radii of a magnetic memory disc rotating at constant angular velocity are determined. Each track includes at least one reference zone including a plurality of initial cells. Each initial cell has magnetic flux variations which when read by the head result in a first waveform that includes undulations enabling the head to be properly servo controlled to a position over the center of the track and a further undulation that is distinguishable from the head positioning undulations because it has a larger amplitude. The initial cells are followed by plural binary bit representing data cells each having magnetic flux variations which when read by the head result in a second waveform including a data representing undulation that has approximately the same amplitude as the further undulations. The undulations are susceptible of having varying amplitudes as the head is positioned at different positions of the disc. In response to a detected peak amplitude of each further undulation of one reference zone a threshold is set for the further undulations of subsequently read first waveforms and for the address cells of the reference zone. An error in a cell is signalled if the set threshold is exceeded by the amplitude of undulations of the first and second waveforms at incorrect times.
摘要翻译： 确定在以恒定角速度旋转的磁记录盘的不同半径处的轨道上的来自参考区域的磁头读取数据的错误。 每个轨道包括至少一个包括多个初始单元的参考区域。 每个初始单元都具有磁通量变化，当磁头读数导致第一波形包括波动时，可以将磁头适当地伺服控制到轨道中心的位置，而另外的起伏可以与磁头定位波动区分开 因为它具有较大的振幅。 初始单元之后是多个二进制位，表示数据单元，每个数据单元各自具有磁通量变化，当磁头读取时，导致第二个波形，包括表示具有与其他波动大致相同幅度的波形的数据。 当头部位于盘的不同位置时，波动可能具有变化的幅度。 响应于一个参考区域的每个进一步波动的检测峰值幅度，为随后读取的第一波形和参考区域的地址单元的进一步起伏设置阈值。 如果在不正确的时间超过第一和第二波形的起伏幅度超过设定的阈值，则发出信号中的错误信号。
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3.发明授权Apparatus and method for shifting a head movable relative to a carrier for recorded information 失效用于移动相对于载体移动的头的记录信息的装置和方法
公开(公告)号：US4166970A
公开(公告)日：1979-09-04
申请号：US753809
申请日：1976-12-23
CPC分类号： G11B17/005 , G11B21/081
摘要： A read/write head moves relative to magnetic discs having track addresses corded thereon in Gray code in a plurality of reference zones. The head is moved by an electric motor and reads information as the head is shifted from a starting track to a destination track. The address of the destination track is expressed in weighted, i.e., standard, binary code, and is stored in a register. The address of the head is read by a read element of the head from the recording tracks. In response to the initial and destination tracks, an intermediate track C, approximately halfway between the initial and destination tracks, is calculated. The head is accelerated from the initial track to the intermediate track by feeding a motor for driving the head with a constant current. In response to the head detecting the address of the intermediate track, the current supplied to the motor is reversed so that the head is decelerated. The calculations and comparisons are performed in the weighted, binary code. The reverse polarity current is applied to the motor until the speed of the head, as determined exclusively in response to addresses read by the head, is lower than a minimum threshold. In response to the speed of the head being detected as less than the minimum threshold, the flow of current to the motor is cut off, at which time the address of the track is compared with the destination track. In response to these two addresses differing, the sequence of steps is repeated.
摘要翻译： 读/写头相对于在多个参考区中以格雷码记录的具有轨道地址的磁盘移动。 头部被电动机移动，并且当头部从起始轨道移动到目的地轨迹时读取信息。 目标磁道的地址以加权的，即标准的二进制码表示，并存储在寄存器中。 头部的地址由记录轨道的头部的读取元件读取。 响应于初始轨道和目的地轨道，计算大约在初始轨迹和目的轨道之间的中间轨道C。 通过馈送用于以恒定电流驱动头部的电动机，头部从初始轨道加速到中间轨道。 响应于头部检测中间轨道的地址，提供给电动机的电流反转，使得磁头减速。 计算和比较在加权二进制代码中执行。 反向极性电流被施加到电动机，直到专门根据头部读取的地址确定的头部的速度低于最小阈值。 响应于检测到的磁头的速度小于最小阈值，切断到电动机的电流，此时将磁道的地址与目的磁道进行比较。 响应于这两个地址不同，重复步骤的顺序。
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公开(公告)号：US4151571A
公开(公告)日：1979-04-24
申请号：US765058
申请日：1977-02-02
CPC分类号： G11B27/105 , G11B2220/20
摘要： Binary coded address information is written by a magnetic head on a magnetic recording medium, such as a disc, as a plurality of tracks, each having an address associated with it. Each track includes a reference zone containing a plurality of individual cells equal to the number of bits in the address. Each cell represents a binary value and includes two binary state transitions, each of which can occur at one of only two positions. One transition of each cell in each zone occurs at the same position within the cell, with adjacent zones having alternating positions of this transition. The other transition in the cells in each zone occurs at either position to represent the binary values.
摘要翻译： 二进制编码地址信息由磁头写在磁记录介质（例如盘）上，作为多个轨道，每个轨道具有与其相关联的地址。 每个轨道包括包含等于地址中的比特数的多个单独小区的参考区域。 每个单元格表示一个二进制值，并包括两个二进制状态转换，每个都可以在两个位置之一中进行。 每个区域中的每个单元的一个转变发生在单元内的相同位置，相邻区域具有该转变的交替位置。 每个区域中的单元格中的其他转换发生在任一位置以表示二进制值。
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5.发明授权Method of reading addresses on a magnetic recording medium and apparatus for putting it into effect 失效读取磁记录介质上的地址的方法和使其生效的装置
公开(公告)号：US4134138A
公开(公告)日：1979-01-09
申请号：US765057
申请日：1977-02-02
CPC分类号： G11B27/105
摘要： Items of information written in a binary code on a plurality of magnetic c tracks are read by a magnetic head. The address for each track is written in a reference zone having a plurality of cells equal to the number of bits in the address. A constant frequency cyclic reference signal H is divided by logic pulses from the head to produce a signal SYNCHRO. The bit of each address is determined by combining the SYNCHRO signals and a pulse representative of the binary value of each bit that depends on the temporal position of a pulse within a period of signal SYNCHRO. The number of cells is counted, each time a bit is determined. The address is sampled bit by bit and transferred to a storage member throughout the counting and sampling operations.
摘要翻译： 通过磁头读取以多个磁盘轨道上的二进制代码写入的信息项。 每个轨道的地址被写入具有等于地址中的位数的多个单元的参考区域。 恒定频率循环参考信号H被来自磁头的逻辑脉冲除以产生信号SYNCHRO。 每个地址的位通过组合SYNCHRO信号和表示取决于信号SYNCHRO的周期内的脉冲的时间位置的每个位的二进制值的脉冲来确定。 计数单元数，每次确定一个位。 在整个计数和采样操作期间，地址被逐位采样并传输到存储器件。
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