Q: What is HD Radio?
A: The term "HD Radio" is iBiquity Digital Corporation's trademarked name for their digital audio broadcasting technology, which has become the IBOC standard adopted for the United States.
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Q: What's IBOC?
A: IBOC — In Band On Channel — derives its name from the kind of digital signal being broadcast. IBOC signals use the same AM and FM bandwidth as a station's analog signal ("in band"). The digital information is contained within the station's signal ("on channel").
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Q: Is HD Radio technology the same as HDTV?
A: Only in the sense that they're both digital signals. Television's move to HDTV is mandated by the federal government. HDTV will soon completely replace current analog television broadcasts (see HDTV: Everything You Need To Know for details. On the other hand, radio stations are voluntarily adding HD Radio technology to their regular broadcasts. Stations will continue using the same AM and FM frequencies they do now.
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Q: What does "HD" stand for?
A: Originally, the initials stood for "hybrid-digital," because the digital signals were carried with the analog wave. According to iBiquity Digital Corporation, that's been changed, and the letters "HD" now don't stand for anything. Some articles and news stories have erroneously assumed that "HD" stands for "high definition," which has contributed to the confusion between HD Radio technology and High-definition TV.
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Q: How is HD Radio different than current FM and AM radio?
A: Because they're digital, HD Radio signals aren't subject to atmospheric interference the way current FM and AM signals are. Background crackle and hiss are eliminated. The effect is similar to the difference between CDs and records. The digital CD signal is free of the surface noise that's always present on LP playback.
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Q: How can I find out if my local station is broadcasting digitally?
A: As stations add HD Radio capability to their service, they generally publicize the fact. iBiquity Digital also maintains a site that lists which stations are broadcasting with HD Radio signals. Click here to find stations broadcasting in HD Radio in your area.
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Q: My radio isn't compatible with HD Radio broadcasts. Will it become obsolete?
A: Partially. Stations broadcasting with HD Radio technology will continue to simulcast their AM or FM analog signals, so you'll be able to enjoy the same stations as before. Without an HD Radio tuner, though, you'll miss out on the digital-only multicast channels stations will now be offering.
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Q: What is multicasting?
A: An HD Radio signal can be subdivided to send out two or more different kinds of programming simultaneously. When a station does this, it is multicasting.
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Q: What is HD2?
A: HD2 is the term multicasting stations are using for their secondary digital-only channel. Some stations are using this second channel to offer more specialized programming, such as Latin Hits, Classical Opera, and Electronica.
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Q: Can all HD Radio tuners get these extra channels?
A: Multicasting was developed after the first generation of HD Radio tuners hit the market. While all HD Radio tuners will pick up the station's primary digital channel, only radios that are designated multicast-capable will be able to pick up HD2 and any additional subchannels. Multicasting capability has since become a standard feature on HD Radio tuners. At this point, most HD Radio tuners on the market can receive multicast channels.
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Q: Satellite radio requires a monthly subscription fee for their digital broadcasts. What do HD Radio broadcasts cost?
A: Like current FM and AM radio, HD Radio broadcasts are free to the public. Your only expense is the purchase of an HD Radio tuner.
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Q: Is the coverage area of my station's HD Radio signal identical to that of their current signal?
A: Although the coverage area will be similar, there can be areas where only the analog signal can be heard, and conversely, areas where only the HD Radio digital signal can be tuned in. Because terrain obstacles affect analog and digital signals in slightly different ways, there's no sure-fire way to predict reception, especially on the outskirts of a station's coverage area.
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Q: What happens if I lose the HD Radio signal?
A: If your HD Radio tuner loses the station's digital signal, it will automatically switch over to the analog signal broadcast at the same frequency. There may be a slight break in the sound when this happens. When the tuner is back in range of your station's HD Radio signal, it will automatically go back to the digital broadcast.
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Q: I see a lot of car radios use the term "HD Radio ready." What does that mean?
A: An HD Radio ready car radio — or "head unit" — can play HD Radio signals, but requires connection to a separate HD Radio tuner. If the radio is a factory stereo, you'll have to get the tuner from the dealer. If you have a brand-name stereo, we probably have the add-on tuner you need.
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Q: Can I only hear HD Radio in the car?
A: No. Several manufacturers offer stand-alone tabletop radios that have built-in HD Radio tuners. There are also a few home theater and stereo receivers with HD Radio tuners available as well. The first add-on component HD Radio tuner for advanced audio/video systems came to market in 2007.
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Q: What is "tagging"?
A: "Tagging" is short for iTunes® Tagging, a process that lets you select the song you're listening to on an HD Radio station and save it for purchasing at a later time. To take advantage of this feature, you need three things: a docking iPod® an audio/video component that includes an HD Radio tuner, iPod dock and "Tag" button; and a local radio station that's broadcasting an HD Radio signal that has enabled tagging.

As you're listening to a station broadcasting a tag-enabled HD Radio signal, press the "Tag" button when you hear a song you'd like to purchase. The component saves the song information (but not the song itself) in its memory. When you dock your iPod to the device, the information automatically transfers to your iPod. The next time you sync your iPod to your computer, your tagged selections will appear as a list in iTunes, giving you the option of purchasing them through the iTunes Store. The tagged songs you elect to purchase are then downloaded to your PC's iTunes library, and copied to your iPod.
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