| 摘要 |
An incoming signal sequence coded in accordance with a NRZ-1 code is to be recorded on a magnetic tape after recoding into a Miller code. To eliminate DC components in some Miller sequences, the incoming data bits are examined in sets containing no more than four bits to determine whether sequences with DC components are present. If so, an NRZ coded sequence having no DC component is substituted for the corresponding bits at the output of the Miller coder. At the reproducing end, similar testing takes place to determine whether a substitute signal sequence is present. If such is detected, the NRZ coded signals which it replaced at the coding end are substituted for the corresponding signals in a Miller decoder.
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