Data modulation arrangement for selectively distributing data

H - Electricity – 04 – N

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H04N 7/26 (2006.01) H04N 7/16 (2006.01) H04N 7/173 (2006.01)

Patent

CA 2177163

A cable television distribution arrangement is supplied via optical fibers with additional digital signals which are delivered to customers via coaxial drop cables (20) modulated at frequencies above those of the conventional analog television channels. A reduction in the required number of modulators is achieved, while delivering individually selected signals to individual customers, by supplying digital signals for a group of customers to a first modulator (72) and a pseudo data signal to a second modulator (84), and selecting (78) between the outputs of the two modulators individually for each customer in the group. Switching between the outputs of the modulators is carried out during overhead information (O/H) which is additionally supplied commonly to both modulators.

La distribution de télévision par câble est assurée par des fibres optiques avec des signaux numériques supplémentaires qui sont transmis aux clients par des câbles d'abonnés coaxiaux (20) modulés à des fréquences supérieures à celles des canaux de télévision analogiques traditionnels. Il est possible de réduire le nombre de modulateurs nécessaires tout en transmettant les signaux sélectionnés indépendamment à chaque client, en fournissant des signaux numériques pour un groupe de clients à un premier modulateur (72) et un signal de données fictives à un deuxième modulateur (84), et en sélectionnant (78) les sorties des deux modulateurs indépendamment pour chaque client dans le groupe. La commutation entre les sorties des modulateurs est effectuée pendant la transmission aérienne des informations (O/H) aux deux modulateurs.

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