| 摘要 |
A method of receiving a codirectional interface digital signal coded in bipolar form, each data bit being represented by means of four bits (1,1,0,0) for a binary "1" and (1,0,1,0) for a binary "0", a polarity alternation being effected every bit with a violation of polarity at each octet, comprising the steps of: separating the interface signal into its positive and negative components; producing a rectified signal from the said components; deriving from the rectified signal a bit timing signal; deriving the decoded data signal from the rectified signal and the timing signal; deriving from said components a signal representing the alternations of polarity; deriving from this latter signal and from the bit timing signal an octet timing signal; and comparing in phase the bit timing signal and the polarity alternation signal, a pulse for rephasing the bit timing signal being produced when the states of these two signals do not coincide at the time of a polarity alternation.
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