H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 1/06 (2006.01) H04B 7/08 (2006.01) H04L 1/00 (2006.01)
Patent
CA 2383898
A television or other signal is received via main and duplicate feeds (11, 12) into buffers (22, 42). Should the main feed suffer interruption or disturbance the output (13) is switched at (16) over to the duplicate feed, but in a staged process. Upon initial detection of disturbances read-out from the main buffer (22) is performed using locally generated timing signals in lieu of timing signals obtained from the incoming signal. If however the disturbances persist the two buffers are synchronised and switchover performed.
Selon l'invention, un signal de télévision ou autre est reçu dans des tampons (22, 42) par l'intermédiaire d'alimentations principale et de duplication (11, 12). En cas de coupure ou de perturbation de l'alimentation principale, la sortie (13) est commutée sur (16) au moyen de l'alimentation de duplication, mais en plusieurs étapes. Dès la détection initiale de perturbations, la sortie est effectuée à partir du tampon principal (22) au moyen de signaux de temporisation produits localement, au lieu de signaux de temporisation obtenus à partir du signal entrant. Si toutefois des perturbations persistent, les deux tampons sont synchronisés et un basculement est effectué.
Hoy Nigel
Rayner Andrew
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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