METHOD AND CIRCUIT FOR DECODING A CYCLACALLY CODED SIGNAL

The invention relates to an operational method for a network with terminals (EG1,...EGm) that can be interconnected by switching nodes ( K1,...Km) of the network, wherein other appropriately authorized terminals can also become involved in communication once a link has been established between two terminals. When a terminal (EG1) involved in said communication wishes to maintain communication with only one terminal (EG2) and terminate communication with remaining terminals (EG3 to EG6), said terminal (EG1) sends a corresponding request to all switching nodes (K1...K5) participating in the communications network set up by the terminals (EG1 to EG6). Upon receiving such a request, each switching node of the communications network sends a corresponding confirmation back to the switching nodes issuing said request. To this end, a switching node only returns confirmation to the switching node which has sent it a request when it receives confirmation from all switching nodes to which it has sent a request. Once confirmation arrives in the switching node (K1) to which the terminal (EG1) issuing the request is allocated, said switching node (K1) sends a request for disconnection of the terminals concerned (EG3 to EG6) to the other switching nodes (K2 to K5) whereby the switching nodes (K1, K2, K4, K5) allocated to the terminals (EG3 to EG6) to be separated, disconnect said terminals from the communications network. Postopek služi dekodiranju s pomočjo vsaj enegageneratorskega polinoma g(x) ciklično kodiranegain od oddajne do sprejemne enote (CTX, DRX) prenešenega signala, ki se v sprejemni enoti (DRX) po eni strani dovaja podatkovnemu pomnilniku (DM) in po drugi strani dekoderju (DEC; DEC1), ki je predviden za dekodiranje prenešenih kodnih besed s pomočjo polinoma g(x). Z večkratnim prenosom identičnih kodnih besed naj se zagotovi, da se vsaj enaizmed kodnih besed brez napake sprejme z veliko verjetnostjo. V tanamen (DEC; DEC1) po vsakem dovajanju sprejetega podatkovnega bita dekoder tvori sindrom Sg, ki se odloži v sindromskem pomnilniku (SM, SM1), pri čemer se za preverjanje 1,..., n v podatkovnem pomnilniku (DM) odloženih podatkovnih bitov tvori razlika sindromov Sg 1, Sg n+1, ki ustrezata prvemu kot tudi n+1 podatkovnemu bitu, nakar se 1,..., n vpodatkovnem pomnilniku (DM) odloženih podatkovnih bitov nadalje obdelajo, če je razlika sindromovS g1, Sgn+1 enaka nič. Postopek po izumu omogoča prenašanjedaljših telegramov, ki so s strani sprejema dekodirani na pose