公开(公告)号：EP0592762B1

公开(公告)日：1998-01-28

申请号：EP93105059.5

申请日：1993-03-26

Applicant: TANDBERG DATA A/S

Inventor： Jahren, Rolf

IPC: G11B5/584 ,  G11B5/54 ,  G11B5/55 ,  G11B5/58

CPC classification number: G11B5/584

公开(公告)号：EP0597171A1

公开(公告)日：1994-05-18

申请号：EP93106787.0

申请日：1993-04-27

Applicant: TANDBERG DATA A/S

Inventor： Solhjell, Erik ,  Jahren, Rolf

IPC: G11B5/584

CPC classification number: G11B21/103 ,  G11B5/584 ,  G11B21/081

Abstract: A method for positioning a read head substantially at a center line of a track of recorded data. Error correction information is provided in recorded data on the track, preferably in conjunction with blocks. A length of the track over which error correction information will be accumulated is defined, such as over a given number of the blocks. At a starting position of the read head, a number of errors is counted which occurs over said defined length. If the number of errors counted exceeds a preset maximum, repositioning the head to a new position, and again counting a number of errors which occur over the defined length, and determining if the number of errors still exceeds the preset maximum. The repositioning is performed until the number of errors over the given length no longer exceeds the preset maximum, the preset maximum being chosen so that when the preset maximum is no longer exceeded, the read head then substantially overlies the center line of the track where a minimized number of read errors occurs.

Abstract translation: 一种用于将读取头基本定位在记录数据的轨道的中心线上的方法。 在轨道上的记录数据中提供纠错信息，最好与块一起提供。 定义纠错信息将被累积的轨道的长度，例如在给定数量的块上。 在读取头的起始位置处，计数出现在所述定义的长度上的多个错误。 如果计数的错误数量超过预设的最大值，则将头部重新定位到新位置，并再次计算在定义的长度上发生的错误数量，并确定错误数量是否仍超过预设最大值。 重新定位被执行直到在给定长度上的错误数量不再超过预设最大值，预设最大值被选择为使得当预设最大值不再超过时，读取头基本上覆盖轨道的中心线，其中a 最小化发生读取错误的次数。

公开(公告)号：EP0592762A1

公开(公告)日：1994-04-20

申请号：EP93105059.5

申请日：1993-03-26

Applicant: TANDBERG DATA A/S

Inventor： Jahren, Rolf

IPC: G11B5/584 ,  G11B5/54 ,  G11B5/55 ,  G11B5/58

CPC classification number: G11B5/584

Abstract: A method for seeking the center of a data track recorded on a magnetic tape using a read head, having an accuracy which is not limited by the stepper mechanism which positions the read head relative to the tape, makes use of the discovery that the fundamental component of tape wander is independent of the tape cartridge vendor and the tape length, and therefore the tape wander can be averaged over an integral number of tape wander periods. In the method, the average output from a read head over an integral number of tape wander periods is found at the lower and upper edges of a data track. The read head output from the center of the track is then measured, and is used to calculate an output change versus head position when the read head is partially in the track. The output change versus head position is then used to scale the lower or upper edge position to a position which would result in an output equal to the output found for the opposite edge, and then the center of the track can be found by dividing the sum of one edge position plus the corrected position for the opposite edge by two.

Abstract translation: 使用读头读取记录在磁带上的数据磁道的中心的方法，其具有不受限于读取头相对于磁带的步进机构的精度，利用以下发现：基本分量 磁带漂移独立于磁带盒供应商和磁带长度，因此磁带漂移可以在整个数量的磁带漫游周期内进行平均。 在该方法中，在数据轨迹的下边缘和上边缘处发现来自读头的平均输出在整个数量的磁带漫游周期上。 然后测量从轨道中心的读取头输出，并且当读取头部分在轨道中时用于计算与头部位置的输出变化。 然后，输出变化与磁头位置的比较将下边缘或上边缘位置缩放到一个位置，该位置将导致输出等于相对边缘的输出，然后可以通过将总和除以 一个边缘位置加上相对边缘的修正位置两个。