G - Physics – 06 – K
Patent
G - Physics
06
K
352/16, 354/222
G06K 5/00 (2006.01) G11B 20/18 (2006.01) G11B 27/10 (2006.01) H04L 1/00 (2006.01)
Patent
CA 1044800
DATA RESYNCHRONIZATION ABSTRACT Electrical signals recorded on a magnetic medium as magnetic indicia represent digital data. Digits of data are recorded as encoded pairs of indi- cia (couples) by corresponding pair of signals. Successive encoded indicia are recorded on the medium serially in sequence; for example, in stripes oriented diagonally across magnetic tape. During reading, defects in the medium, or errors in data transfer, resulting in a loss of synchronization between encoded indicia and the digit represented, are compensated for. Encoded indicia are continuously compared with a resynchronization pattern dispersed throughout recorded data at regular intervals. When an error is detected, the encoded indicia are decoded and stored in two buffers, each storing sets of digits decoded from differently chosen indicia pairs. The contents of one of these buffers is thereafter utilized when a resynchronization pattern identifies the correct set of digits.
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