Rf back channel for dtv

H - Electricity – 04 – N

Patent

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H04N 7/173 (2006.01)

Patent

CA 2392683

A communication system comprises a digital data source including a digital VSB remodulator, such as a VCR, and a downstream digital VSB device, such as a television. The digital VSB remodulator remodulates digital data from the data source received on one of a plurality of channels to digital VSB data on a downstream channel and transmits the digital VSB data to the downstream digital VSB device in the downstream channel at a symbol rate fs. The downstream digital VSB device transmits information, such as its identification, to the digital VSB remodulator in an upstream channel corresponding to a carrier frequency (N/M)fs. The plurality of channels and the downstream channel occupy a bandwidth above about 50 MHZ, and (N/M)fs is below this bandwidth.

Un système de communication comprend une source de données numériques comprenant un remodulateur VSB numérique tel qu'un magnétoscope et un dispositif numérique VSB aval tel qu'une télévision. Le remodulateur VSB numérique remodule les données numériques à partir de la source de données, reçues par un des canaux, en données VSB numériques dans le canal aval et transmet les données VSB numériques au dispositif numérique VSB aval dans le canal aval avec un débit de symboles f¿s?. Le dispositif numérique VSB aval transmet des informations telles que son identification au remodulateur VSB numérique dans un canal amont correspondant à une fréquence de porteuse (N/M)f¿s?. Les canaux ainsi que le canal aval occupent une bande passante supérieure à 50 MHZ et (N/M)f¿s? est inférieure à cette bande passante.

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