| 摘要 |
<p>The system is for marking sequences of data inscribed on a first track of a magnetic tape. This tape passes through a tape reader which has at least two magnetic reading heads. The first reading head reads the first track. The second reading head reads a second track on which is inscribed, in binary code, groups of digital signals. These groups of signals tape position reference marks. Each group of digital signals forms a position word. This word characterises the section of tape on which it is written. Each group of signals also contains a synchronising word which is identical for all the groups. The system has a first digital circuit connected to the second reading head. This circuit identifies the reading configuration of the synchronising word, which is dissymmetric.</p> |
