Automatic delay compensated simulcasting system and method

Details Automatic delay compensated simulcasting system and method Automatic delay compensated simulcasting system and method

H - Electricity

04

J

H04J 3/06 (2006.01) H04H 20/67 (2009.01)

Patent

CA 2664524

A system and method of synchronizing transmissions in a simulcast system by continuously adjusting the signal transmission delay. Timing information that includes a GPS timestamp is continuously generated at a source site, encoded into a timing packet which along with a content signal can be transported over a network link such as T1/E1 or a packet switched network to multiple transmitter sites. Once received at a transmitter site, the timing packet along with the content signal is delayed by an adjustable delay. The GPS timestamp in the received timing packet is compared to a GPS timestamp that: is generated at the transmitter site upon arrival of the timing packet. Based on a variance between that comparison and the value of a user-specified target delay, the delay of the received signal is adjusted to synchronize signal transmissions in the simulcast system.

La présente invention concerne un système et un procédé de synchronisation de transmissions dans un système de diffusion simultanée grâce à l'ajustement en continu du retard de transmission de signal. Une information de synchronisation comportant un horodatage GPS est générée en continu au site d'origine, codée en un paquet de synchronisation qui conjointement avec un signal de contenu peut être transportée sur un lien de réseau tel que T1/E1 ou un réseau par commutation de paquets vers une pluralité de sites de transmission. Lors de sa réception au niveau du site de transmission, le paquet conjointement avec le signal de contenu est retardé par un délai réglable. L'horodatage GPS dans le paquet de synchronisation reçu est comparé à un horodatage GPS qui est généré au niveau du site de transmission lors de l'arrivée du paquet de synchronisation. En fonction d'une variation entre la comparaison et la valeur de retard cible spécifié par l'utilisateur, le retard du signal reçu est ajusté pour synchroniser les transmissions de signaux dans le système de diffusion simultanée.

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