Method and device for receiving an interface signal

Telegraphy – Systems – Printing

Patent

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Details

178 691, 179 15BD, 325 38A, H04J 306, H04L 702

Patent

active

041907418

ABSTRACT:
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.

REFERENCES:
patent: 3828346 (1974-08-06), Forster
patent: 3863025 (1975-01-01), Gonsewski
patent: 3967060 (1976-06-01), Subramanian
patent: 4041392 (1977-08-01), Gauriat
patent: 4071692 (1978-01-01), Weir

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