Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1984-06-26
1986-06-10
Bookbinder, Marc E.
Pulse or digital communications
Spread spectrum
Direct sequence
375114, 370108, H04L 704
Patent
active
045947287
ABSTRACT:
A synchronization device for digital data frame transmission system comprising an n bit series register transferring its contents at the line frequency to a parallel register also of n bits. The m first bits of the series register are also directed to a logic circuit which tests their conformity with the beginning of the synchronization word. When there is conformity, the logic circuit controls a divider dividing by n which controls, in its turn, at the line frequency divided by n, the transfer of the contents of the parallel register to a PROM memory. The purpose of the PROM is to recognize the entire synchronization word. When there is no recognition, the operation of the divide by n divider is inhibited and the procedure begins again.
REFERENCES:
patent: 3603735 (1971-09-01), Cleobury
patent: 4242755 (1980-12-01), Gauzan
patent: 4298987 (1981-11-01), Stattel
Gourdon Claude
Niquel Maurice
Rouxel Jean
Bookbinder Marc E.
Lignes Telegraphiques et Telephoniques LTT
Plottel Roland
Telesz Andrew
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