Data transmission system for synchronously transmitting an auxil

Pulse or digital communications – Repeaters – Testing

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3701104, H04B 1404, H04J 312

Patent

active

053696697

ABSTRACT:
A data transmission system is proposed in which an auxiliary bitstream of low bitrate (AUX) is coded together with a main bitstream of high bitrate (PRIM) without increasing the transmission rate above the high bitrate. This auxiliary bitstream (AUX) is moreover transmitted synchronously with the main bitstream (PRIM). Transmitter (T) divides the main bitstream (PRIM) in periodically occurring blocks of Y bits and codes one bit of the auxiliary bitstream (AUX) in each of the blocks by using a first (AMI) or a second (VAMI) coding law according to the binary value of that bit. The second law is constructed by violating the first coding law (AMI) according to a predetermined violation law. Redundancy in the first coding law (AMI) is used to introduce symbol sequences not permitted under this first coding law (AMI) and to so obtain the second coding law (VAMI).

REFERENCES:
patent: 4071692 (1978-01-01), Weir
patent: 4131761 (1978-12-01), Giusto
patent: 4408325 (1983-10-01), Grover
patent: 4550403 (1985-10-01), Beynie 370110.4
J. B. Bushner, "Ternary Line Signal Codes", Proceedings of the International Seminar on Digital Communications, 15 Mar. 1974, pp. F1-F9.

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