The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 1977
Filed:
Mar. 30, 1976
Jean-Claude Jolivet, Saint-Michel-en-Greve, FR;
Francois-Xavier Stouls, Perros Guirec, FR;
Societe Anonyme de Telecommunications, Paris, FR;
Abstract
A transmission system of the kind comprising, on emission, a code converter for coding said signals into variable length words according to their occurrence probabilities, the word rate being determined by an emission clock, a synchronizing word generator operating at a frequency bound to said emission frequency, means for multiplexing words from the code converter and synchronizing-words, and an elastic memory connected to said multiplexing means, and, on reception, an elastic memory connected to said emission elastic memory, reading on emission and writing on reception being carried out at a rate determined by a transmission clock, means for detecting synchronizing-words at the output of said reception-memory and a decoder for deriving said signals from said variable length words, said system further comprising, on emission, means for supplying to said multiplexing means the drift of said emission frequency with respect to a frequency bound to said transmission frequency, and, on reception, a controlled oscillator supplying a timing signal for reading said reception memory, means for detecting said drift, said means being controlled by the synchronization-detection; and means for recovering said emission frequency from said drift and said frequency bound to the transmission frequency, said recover means controlling said oscillator.