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:
Jun. 07, 1983
Filed:
Nov. 28, 1980
Patrick E Boutmy, Paris, FR;
Gilbert J Le Fort, Lannion, FR;
Societe Anonyme de Tele-Communication, Paris, FR;
Abstract
This invention relates to an arrangement for transmitting a digital supplementary information signal having a low rate with a digital data signal having a high rate. The insertion of the supplementary information in the data signal is based on the modification of the accumulative disparity of data signal as a function of the logic level of the supplementary information signal. According to a first embodiment, parity check words are periodically inserted in the data signal and have their accumulative disparity which depends upon the comparison of the desired parity indicated by the logic level of the supplementary information signal with the accumulative disparity of data digits between two successive parity check words. According to a second embodiment, the parity check words are words which correspond to the binary-to-ternary transcoding of a predetermined bit group of the data signal which is scrambled into a pseudo-randomized signal having a constant accumulative disparity over a predetermined period of time.