Data transmission system

Details Data transmission system Data transmission system

H - Electricity

04

L

H04L 5/22 (2006.01) H04J 3/00 (2006.01) H04J 3/22 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2086145

- 39 - J. TOMBAL - P. REUSENS - D. SALLAERTS 1-11-5 ABSTRACT DATA TRANSMISSION SYSTEM 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). To achieve this 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 said 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). Fig. 1

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