The country is beginning to hear about the coming Digital Television transition. Unfortunately, there are continuing areas of confusion, even (as pointed out previously) among experts. One of the key points that trip up people is that there are really two transitions. Let’s make one thing clear up front. If you get television from a cable operator (or one of our competitors), you probably lump all those channels together: CNN, Fox, Lifetime, ABC, it’s all the same, right? But some channels are from broadcast stations in your area: ABC, NBC, CBS, Fox, The CW. Those other channels, such as MTV and ESPN, are cable channels. The high-profile DTV Transition coming in February 2009 — as full power over-the-air broadcast TV stations switch to digital and turn off their analog broadcast signal — is the broadcast industry’s digital transition. And although cable is playing a role in that, the cable industry is going through its own transition. Let me explain the difference.

The broadcasters’ transition is about digital television, where the picture and sound information is expressed in the form of data bits representing, for example, a “1” or a “0”. You can think of this transition as analogous to the transition from vinyl records to CDs.

Cable operators are also transitioning some analog channels onto digital cable tiers in order to reclaim space. With digital cable, compression technology is used to allow more than one program service to be carried in the bandwidth space normally required for one analog program service. Typically, the signal is sent to the home, decompressed in the set-top box and changed into analog signals for display on the television. You can think of this transition as something like the manner in which you can compress large files for easier downloading, and then you decompress them for viewing.

Your local TV stations are offered in hi-def formats on digital cable, but digital TV and digital cable are two different animals.

As we’ve discussed before, part of the DTV Transition will require that you get a digital-to-analog converter box to continue watching full power over-the-air broadcast TV stations on an analog TV set. If all your TV sets are connected to cable, you won’t need to do anything to continue to watch your local broadcast stations.

However, some popular cable channels are only available on cable’s digital tiers. In addition, other popular cable channels may be moving from the analog tier to the digital tier because channel space is limited. In these circumstances, you may want to move up to digital service from your cable company — and a digital cable set-top box. But don’t confuse cable’s digital migration with the broadcasters’ digital TV transition.

There’s no denying that the Digital Television Transition is a complicated issue. Even those of us who work on it all the time sometimes have difficulty keeping all of the technical details straight. Some people seem confused over whether a box is always necessary to keep watching TV.

Here’s one example. Earlier this week, on a Public Radio program dealing with current technology issues, that subject of the coming DTV transition was discussed:

Host: How do I make sure that my TV doesn’t go blank on February 17?

Guest: What you have to do is look at how TV gets to your TV. If you subscribe to satellite or you subscribe to cable, and in either case you have a box, some kind of tuner or digital video recorder connected to your TV, you don’t have to do anything. Any digital conversion that is necessary is done in that box. At worst, your cable or satellite company will ship you a new box at some point. The tricky issue is people who either…

Host: Have cable without a box.

Guest: Yes. They have a cable ready TV and they just subscribe to basic or expanded basic so that they’re used to the joy of watching TV with only remote control on the coffee table. They may need to get a box where they didn’t have one before because the cable companies - and this is actually separate from the digital transition in a certain sense - they only have to keep providing a very basic set of channels in an unencrypted analog form that you can get with your cable ready TV.

Here’s another example: In the latest edition of the Bose newsletter, there’s the same error. It says that you’ll need to do nothing for the transition if “You subscribe to digital cable TV.” Further down, it states that it is a “Myth” that cable subscribers are ready for the changeover, suggesting that cable subscribers who receive analog service will be left out.

The source of the confusion seems to be that two topics are combined. It’s important to remember that this DTV Transition is only for the over-the-air broadcast industry. Cable is going through its own “digital transition.” Because of that word “digital,” the two often get confused.

What will cable subscribers need to do in preparation for the DTV Transition next February? The current information is that cable customers - whether or not they have a set-top box - will still be able to watch television after Feb. 17, 2009. At the same time, the cable industry has been moving towards a digital platform; as part of that, sometimes operators will move channels from the analog tier to the digital tier, which then needs a digital set-top box for reception.

Bottom line: If you have cable service, you should be fine, with the set-top box as an irrelevant factor. However, if you want to get access to cable’s newer services, such as hi-def TV or digital video recorders, or if you want to see the hundreds of programming choices available through the digital cable platform, you’ll need to have the appropriate set-top box. You can avoid having a box by purchasing a Digital Cable Ready television, but the current sets are only one-way, which means you won’t have access to interactive services. However, the tru2way standard will address this issue.

As always, you can visit the Get Ready for Digital TV site for more information (también en Español).

You’ve heard about those DTV converter boxes that you can get a coupon for. News today that the Consumer Electronics Association (CEA) has partnered with the National Association of Broadcasters (NAB) on an upgrade of the nine-year-old site AntennaWeb.org, “an online antenna mapping program designed to help users determine the proper outdoor antenna to use in order to receive free local broadcast channels.”

In other news, the DTV Transition Coalition, of which NCTA is a founding member, put out a media release on Friday pointing out their tremendous growth in membership. It’s a long and varied list that includes “consumer groups, broadcast, cable and consumer electronics companies, retailers, civil rights and grassroots organizations, trade associations, and state and local government organizations.”

We’re coming up pretty quickly on the official start to the One Year Countdown to the Digital Television Transition.

On the off-chance that the preceding sentence was complete gibberish to you, let me step back and explain. The DTV Transition refers to the coming switch from analog to digital over-the-air broadcast television. Congress has mandated that after February 17, 2009, full power television stations will stop broadcasting in analog, and will broadcast in digital exclusively. Changing over to a digital format will create efficiencies in the use of the radio frequency spectrum on which the nation’s TV broadcasters transmit their signals. Some of the old spectrum that’s freed up will be made available to first-responders such as local police and fire departments and will enhance the way they react to emergencies, which will significantly increase public safety for all Americans.

That phrase “full power broadcast TV stations,” however, is a really important distinction, as the FCC’s website points out:

While the majority of consumers in the U.S. can receive the programming of full-power over-the-air stations, there are three other categories of broadcast TV stations - “low-power,” “Class A,” and “translator” stations. There is currently no statutory deadline for these stations to convert to digital broadcasting.

That page defines what these stations are, but it’s useful to remember that not every station broadcasting in America is going to be transitioning next year.

But there is a solution: analog pass-through in digital-to-analog converter boxes. You’ve possibly heard that you can buy a converter box that will let your old analog TV sets receive and display over-the-air digital signals. There are some of these boxes that will also “pass-through” an analog signal, in addition to performing the conversion for the digital ones.

The National Telecommunications and Information Administration (NTIA) has a list of converter boxes that are eligible for their coupon program, which allows consumers to apply to receive up to two vouchers that offer a significant discount off the price of the converters. That list clearly marks the models that are “capable of passing through an analog signal to the TV set.” Right now, there are three such boxes, but it is expected that additional models will be available in the future.

For more info on the DTV Transition, you can visit the cable industry’s website GetReadyForDigitalTV.com or the NTIA’s website on this topic. If you’re a cable customer, the good news is that for any of your TVs hooked up to cable, you shouldn’t have to do anything to continue enjoying full power broadcast TV stations in their new digital format, whether you have a hi-def television or not.