Prevention of non-allowed character combinations

Details Prevention of non-allowed character combinations Prevention of non-allowed character combinations

1975-02-24

1976-08-24

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

G06F 1112

Patent

active

039769720

ABSTRACT:
A method is disclosed to prevent the transmission of non-allowed character combinations of signal elements which have for example, a route administrating or a control function. In the sender a sequence of the information carrying signal elements is formed. The sequence is divided into parts each including N-n signal elements. New character signals are formed by completing each of such parts with n signal elements, selected in such manner that only characters which are allowed are formed and the formed characters are transmitted to the receiver. In the receiver such parts including N-n signal elements are restored by removing the n signal elements for each character signal. Then a sequence of the original information carrying signal elements is formed and the last mentioned sequence of signal elements is divided in the original character signals consisting of N information elements.

REFERENCES:
patent: 3038961 (1962-06-01), Walker et al.
patent: 3412380 (1968-11-01), Heller et al.
patent: 3688261 (1972-08-01), Henderson

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