H - Electricity – 04 – M
Patent
H - Electricity
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H04M 11/06 (2006.01) H04B 10/12 (2006.01) H04J 14/02 (2006.01) H04N 7/22 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01) H04H 1/02 (2006.01)
Patent
CA 2114653
A method of transmitting broadband video services from a broadband digital signal source which includes forming the digital signal from said source into a plurality of channels of digital signals and modulating a plurality of carrier signals with respective channels of the digital signals. The resultant modulated channels are multiplexed to form a combined signal which is then used to modulate light from a laser light source. The modulated light signal is transmitted along a light fibre to a local distribution box where it is converted to electrical signals and broadcast to a number of subscriber set top terminals. Each set top terminal detects the modulated signal of a channel pre-assigned to that set top terminal. User control information is also received by that set top terminal and transmitted to the central office.
Méthode de transmission de services vidéo en large bande à partir d'une source de signaux numériques en large bande, comprenant la production du signal numérique provenant de ladite source sur un certain nombre de canaux de signaux numériques et la modulation d'un certain nombre de porteuses à partir des canaux correspondants. Les canaux modulés résultants sont multiplexés pour former un signal combiné qui est ensuite utilisé afin de moduler la lumière provenant d'une source de lumière laser. Le signal lumineux modulé est transmis sur une fibre optique vers une boîte de distribution locale où il est converti en signaux électriques et transmis à un certain nombre de coffrets d'abonnés. Chaque coffret d'abonné détecte le signal modulé d'un canal qui lui est pré-assigné. En outre, il reçoit de l'information de commande d'abonné, qui est transmise au central
Geofroy Joe
Kothary Piyush Bhupatrai
Look Christopher Michael
Ibm Canada Limited - Ibm Canada Limitee
Saunders Raymond H.
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