公开(公告)号：US3786439A

公开(公告)日：1974-01-15

申请号：US3786439D

申请日：1972-12-26

Applicant: IBM

Inventor： MC DONALD E ,  PATEL A

IPC: G06F12/16 ,  G06F11/10 ,  G11B20/18 ,  H03M13/00 ,  H03K13/34 ,  G11B27/36 ,  H04L1/10

CPC classification number: G11B20/1833

Abstract: Error detection is enhanced by using multiple independent error codes combined with nonlinear changes in the data field as applied to different error codes. Such nonlinear permutations increase the probability of detecting errors thereby maximizing the utilization of check bit redundancies. In a magnetic tape subsystem, error detection and correction can be enhanced by scrambling track-to-error code relationships between a plurality of independent codes. Tracks with the highest probability of errors, i.e., the outside tracks on a 1/2 inch tape, for example, are connected to nonadjacent inputs of error correction code apparatus. Additionally, the input-to-track relationship of various code apparatus can be scrambled, either permanently or during a tape transducing operation. The above permutations provide best advantage with selected error correction codes and systems having identifiable probability of error patterns.

Abstract translation: 通过使用多个独立的错误代码结合应用于不同错误代码的数据字段中的非线性变化来增强错误检测。 这种非线性置换增加了检测错误的可能性，从而最大化了校验位冗余的利用率。 在磁带子系统中，可以通过对多个独立代码之间的跟踪到错误代码关系进行加扰来增强错误检测和校正。 具有最高错误概率的轨道，例如1/2英寸磁带上的外部磁道，连接到纠错码装置的不相邻的输入端。 此外，可以永久地或在磁带传输操作期间扰乱各种代码设备的输入到轨道的关系。 上述排列为选择的纠错码和具有可识别的错误模式概率的系统提供了最佳的优点。