Supplementary information transmitting arrangement for a digital

Details Supplementary information transmitting arrangement for a digital Supplementary information transmitting arrangement for a digital

1980-11-28

1983-06-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370111, 370 11, H04J 312, H04J 1500

Patent

active

043874606

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.

REFERENCES:
patent: 3283302 (1966-11-01), Brass
patent: 3636524 (1972-01-01), Holland
patent: 3870828 (1975-03-01), Saliga
patent: 4151373 (1979-04-01), Widmer et al.
patent: 4173014 (1979-10-01), Leighou et al.

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