公开(公告)号：WO1990005280A1

公开(公告)日：1990-05-17

申请号：PCT/US1989005119

申请日：1989-11-13

Applicant: BRIER TECHNOLOGY, INC.

Inventor： BRIER TECHNOLOGY, INC. ,  KENNY, Philip ,  CAUTIS, Dan ,  BIZJAK, John

IPC: G01B21/10

CPC classification number: G11B5/584 ,  G11B5/5534 ,  G11B5/5547 ,  G11B21/106

Abstract: A method and apparatus for performing adaptive calibration of a disk assembly and for determining an offset value to compensate for differences in servo head (28) to data head (29) distance from a nominal value. The present invention has particular application in a relative track count servo system where absolute track position is not known from a reading of the servo track (15) itself. In the preferred embodiment, a single head assembly (27) having both a data head and a servo head is utilized. The distance between the data head center and the servo head center must be known so that a disk (10) written on one drive assembly can be read in another drive assembly. This distance is a nominal value but may vary due to manufacturing tolerances. In the present invention, both the data and servo heads are utilized to establish a servo anchor reference track and to determine an offset correction value to compensate for variations in the servo/data head spacing. A dual reference track architecture is employed on the disk surface. The data head is positioned over the first reference track (11) and centered to within a desired accuracy.

公开(公告)号：WO1990005975A1

公开(公告)日：1990-05-31

申请号：PCT/US1989005120

申请日：1989-11-13

Applicant: BRIER TECHNOLOGY, INC.

Inventor： BRIER TECHNOLOGY, INC. ,  BIZJAK, John ,  HASSEL, Michael ,  NIEMANN, David

IPC: G11B05/09

CPC classification number: G11B20/10009 ,  G11B20/1419

Abstract: At a first frequency (30), flux transitions are achieved which result in large excursions of the information signal. The first frequency approximates the maximum frequency at which such excursions can occur. A second higher frequency (89) is utilized to create small or no excursions. At this second frequency, a complete flux transition is not achieved. Information is represented by the presence or absence of excursions. An adaptive, self-compensating scheme, which is self-adjusting in real time and provides for recovery of the nominal flux transition independent of the information pattern, is utilized. Data recovery is qualified through the use of an excursion detection scheme which compares variations in the tracking peak (91) detect value with the input signal separated by an excursion threshold value. When the input waveform falls below the adaptive threshold voltage (94), a data transition is defined.

Abstract translation: 在第一频率（30），实现了磁通转换，导致信息信号的大偏移。 第一个频率近似于发生这种偏移的最大频率。 使用第二较高频率（89）创建小的或不偏离的偏移。 在该第二频率下，不能实现完全的磁通转换。 信息由有或无缺席表示。 利用自适应自补偿方案，其实时自调节并且提供独立于信息模式的标称通量转换的恢复。 通过使用偏移检测方案来限定数据恢复，其将跟踪峰值（91）检测值的变化与由偏移阈值分隔的输入信号进行比较。 当输入波形低于自适应阈值电压（94）时，定义数据转换。