Emergency alert signaling method and dtv receiver

G - Physics – 08 – B

Patent

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Details

G08B 27/00 (2006.01) G08B 21/10 (2006.01) H04N 5/455 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2564755

A terrestrial digital television receiver includes a tuner, a microcomputer, and a demodulator. The microcomputer initially determines whether the DTV receiver is on a power-on or power-off mode. If the DTV receiver is on the power-off mode, the microcomputer control operation of the tuner to tune to a predefined emergency alert channel to receive a master guide table. The demodulator parses the master guide table. If the parsed master guide table indicates that a new emergency alert message is being received, the microcomputer automatically sets the DTV receiver on the power-on mode and controls operation of the tuner to tune to the emergency alert channel.

Un récepteur de télévision numérique (TVN) terrestre comprend un syntoniseur, un micro- ordinateur et un démodulateur. Le micro-ordinateur détermine d'abord si le récepteur TVN est en mode sous tension ou hors tension. Si le récepteur TVN est en mode hors tension, le micro- ordinateur commande le fonctionnement du syntoniseur pour s'ouvrir sur une chaîne d'alerte et d'urgence prédéfinie pour recevoir la table maîtresse de guidage. Le démodulateur analyse la table maîtresse de guidage. Si cette analyse indique qu'un nouveau message d'alerte et d'urgence est reçu, le micro-ordinateur met automatiquement le récepteur TVN en mode sous tension et commande le syntoniseur pour passer à ladite chaîne d'alerte et d'urgence.

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