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DTV: Hold on Tight, Here We go

That interest has even filtered into our market, where AV integrators are being asked to incorporate terrestrial digital TV reception into retrofit or new installs, and some manufacturers have introduced RS-232-controllable ATSC tuners. The idea is that local news, weather, and other information would be available free of charge (and of course, it doesn't hurt that the Super Bowl or World Series might be fun to watch in a boardroom).

Seriously, though: It's an excellent idea to have access to local DTV stations for emergency preparedness reasons, if no other. Tornadoes, hurricanes, earthquakes, fires, and other natural disasters can disrupt cable or satellite TV services (the "one serving many" model), but it's unlikely that every TV station would be forced off the air during such events (the "many serving one" model).

Another market that is interested in adding terrestrial DTV reception is education. Most Public Broadcasting System (PBS) affiliates multicast three or four channels of specialty programming during all but primetime hours, focusing in on programming for kids, politics, science, health, and do-it-yourself topics.

There are also proposals to add an overlay mobile digital TV service, although there's no indication at present whether this would succeed. A mobile DTV standard is being considered for adoption by the ATSC and would involve willing broadcasters setting aside some of their bandwidth for these channels, which would use MPEG4 encoding exclusively and low-resolution video.

Last-Minute Training

At the TV station level, there's a lot of last-minute training going on. Control room personnel now not only have to check the "on air" monitor from time to time to verify there's actually a signal, but they also need to monitor (among other things) MPEG program streams and numbers, ancillary data (PSIP), audio formats (mono, stereo, Dolby Digital 5.1), audio levels (dialnorm), and captions (converted EIA608 captions and EIA708 digital captions).

How about HDTV reception? A.C. Nielsen announced on November 30, 2008 that HDTV penetration had reached 23.3 percent of all U.S. households. That's more than double the number that Nielsen announced in July 2007, when it started installing new People Meters that measure HDTV viewing.

Admittedly, many of those households are watching only cable or satellite HD channels. But every TV sold after July 2007 (even VCRs and DVD recorders with analog tuners) must include a terrestrial digital TV tuner, so there's potentially a much larger audience for ATSC broadcasts than even those tuned in via NTIA converter boxes.

Way back in 1997, when the DTV transition first got off the ground, it was hard to imagine that digital TV would become such a mainstream service. Early set-top boxes were bulky, unstable, and overheated frequently. Signals were difficult to pull in when received in less-than-perfect environments, and HDTV sets largely used CRT technology, weighed a ton, and required component video connections.

Today, NTIA converter boxes handle multipath with ease. The CRT has largely vanished from store shelves; LCD and plasma HDTVs with 720p and 1080p resolution are going for dirt cheap prices, and customers are now clamoring for digital video recorders (DVRs) to go with their viewing. HDTV is mainstream for local news, sports, talk shows, and prime time programming.

Like it or not, digital is the future of broadcast television. And ready or not, here it comes.

InfoComm Educator of the Year Pete Putman is a PRO AV contributing editor and president of ROAM Consulting in Doylestown, Pa.



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