APPARATUS AND METHOD FOR SUPPORTING THE USE OF MULTIPLE MODULATION SYSTEMS SIMULTANEOUSLY ON TERRESTRIAL DISTRIBUTION NETWORKS

APPARATUS AND METHOD FOR SUPPORTING THE USE OF MULTIPLE MODULATION SYSTEMS SIMULTANEOUSLY ON TERRESTRIAL DISTRIBUTION NETWORKS

An apparatus and method using the forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks including cable television systems is described. The system includes a transcoder having a demultiplexer for demultiplexing a forward-erro...

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1. Verfasser: YOUNG, ALAN D
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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description An apparatus and method using the forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks including cable television systems is described. The system includes a transcoder having a demultiplexer for demultiplexing a forward-error-correction decoded signal into a main data stream with a bit rate suitable for 64-QAM cable transmission and an auxiliary data stream with a bit rate approximately half that of the main data stream. Two of such auxiliary data streams can be combined to generate an output data stream with a bit rate suitable for 64-QAM cable transmission. The system also includes a satellite transmitter which can adjust its convolution coding rate to either +E,fra 1/2+EE or +E,fra 3/4+EE for 64-QAM and 256-QAM cable channels respectively.
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subjects BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
title APPARATUS AND METHOD FOR SUPPORTING THE USE OF MULTIPLE MODULATION SYSTEMS SIMULTANEOUSLY ON TERRESTRIAL DISTRIBUTION NETWORKS
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