| 摘要 |
A predetermined synchronization pattern ( 40 ), a so-called VFO field, in, for example, the headers 3 of an information carrier, consists of sequences of 3T marks and spaces ( 41 ), of 8T marks and spaces ( 42 ) and of 5T marks and spaces ( 43 ). This sequence of patterns is advantageous for setting the dynamic range of an Automatic Gain Controlled (AGC) amplifier located within a device reading the information carrier.
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