Digital Signage: Adding EAS Support

Adding Amber Alerts, severe weather warnings and emergency announcements from civil authorities to private TV and digital signage networks is straightforward.

Last week, I discussed the ability of private TV channels and digital signage networks to disseminate emergency alert messaging when a threat is posed. I also pointed out that unlike Emergency Alert System messages transmitted by radio and TV stations or the wailing siren in the distance, the delivery of emergency messaging via private TV channels and digital signage networks can target specific warnings and instructions to a defined group of people, who may be facing a unique emergency, such as a fire in their office building.

This week, I'll focus on main points you need to know if you want to prepare your digital signage network or private TV channel to deliver Emergency Alert System messaging from the National Weather Service or governmental authorities, including those at the local, state and federal level.

EAS warnings
The Emergency Alert System stems from the desire of the president of the United States to communicate with the public in times of national emergencies. In the early 1960s, the chief executive began allowing local and state authorities to use the system to transmit localized warnings.

The system has been designed to deliver messages quickly and automatically in the event of an emergency. Among its most conspicuous features to the public may be the automatic interruption of broadcast programming that replaces program audio with an aural alert and superimposes a text crawl with warning information at the bottom of the TV screen.

EAS works automatically largely because of the efforts of the Federal Communications Commission http://www.fcc.gov/cgb/consumerfacts/eas.html to standardize the system and the cooperation of the nation's broadcasters to participate in the program.

To add EAS capability a private TV or digital signage network requires:

a special weather radio receiver tuned to receive emergency warnings, such as tornado warnings issued by the National Weather Service for a given geographic area; or

an EAS ENDEC or encoder/decoder that can transmit and receive digitally coded emergency messages;

a communication interface between the ENDEC and the media server used to drive the private TV or digital signage network;

media server software that automatically recognizes incoming EAS information, generates the appropriate text crawl, and interrupts the ongoing playlist or adds the emergency crawl.

Using a weather radio would only provide partial EAS capacity requiring constant monitoring by someone who's responsible for the digital signage network and direct physical intervention with the system. Using an ENDEC provides for full EAS coverage -specifically weather and emergency messages for local, state and national authorities.

The ENDEC receives transmitted EAS data that includes information about who transmitted the alert, for instance civil authorities or the National Weather Service, the type of emergency, such as flash flooding, tornado or Amber Alert, the geographic area of the emergency, how long the emergency message is valid and the when it was issued.

Onward and upward
The FCC has been active in promulgating rules to update the EAS system to take advantage of the latest digital technologies and new means to reach the American public. In May, the commission moved to add support for a new technology known as CAP -or Common Alerting Protocol- to the EAS delivery system. CAP will usher in support of a variety of transmission formats including text, audio and video via broadcast, cable, satellite and other networks.

Most notably it promotes next generation EAS, which among other things may lead to automatic generation of aural warnings based on text crawls to assist those with hearing impairments as well as generation of warnings for non-English speakers.

While these moves by the FCC will take time to play out, it's encouraging to note that the nation's EAS system continues to develop. In the meantime, there's a clear path for those with private TV and digital signage networks to traverse to support today's EAS messaging.

About the author
David Little is a digital signage authority with 20 years of experience helping professionals use technology to more effectively communicate their unique marketing messages. He is the director of marketing for Keywest Technology in Lenexa, KS, a software development company specializing in systems for digital signage creation, scheduling, management and playback. For further digital signage insight from Keywest Technology download our Why Digital Signage Works white paper; subscribe to our digital signage RSS feed that gives a diverse perspective on digital signage from experts around the world; join our weekly digital signage software Webinar; and sign up for our Keywest Update news brief.

Comments (3) >>

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Ricky @ Broadcasters General Store/FL said:

I would like to use the BVCG+software w/ the Sage Endec to provide simple EAS crawls for TV broadcasters who don't want to spend thousands on Chyron Codis et al. Will these two work just fine together??

August 15, 2007

Keywest Tech said:

That is a big YES. Keywest has developed the BVCG specifically to work as a low-cost CG for the SAGE ENDEC. This unit will not key a crawl over the video like the obsoleted 840 did, however. Instead, it has a built-in A-B switch that switches over to a colored screen with the EAS message. At the end of the message it automatically switches back to the programming. Maybe not the most elegant solution, but for $995 it won't bust your budget either. The other alternative is the MediaXtreme MX-A that will do it as nice as the CODI for $5,495.

August 30, 2007

Keywest Tech said:

We have a unit that does lay a crawl over video that cost half as much as MediaXtreme MX-A -the STAR-8.

However, it works only with Sage, not TFT. This unit is the mainstay in our EAS arsenal. It comes with eight composite (NTSC) channels and eight stereo channels. It was developed for CATV MSOs that needed many crawls, but it works fine for broadcasters too if they are analog. It is the most complete, cost-effective solution on the market today.

September 13, 2007

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