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What is HD Radio?

Pioneer-AVH-P4400BH-300x221HD Radio technology allows broadcasters to transmit a high-quality digital signal. For listeners who have an HD Radio receiver, the benefits are:

  • FM radio that sounds almost as good as a CD
  • No more static, pops, crackles or fades
  • Transmission of additional information, such as song titles and artists
  • Increased listening options with multicasting
  • Tagging songs for later purchase through the iTunes® Store

Let’s take a look at each of these in turn.

FM radio with near CD-quality sound

Digital technology allows a radio station to transmit more information in the same radio wave. Primarily, this means higher quality sound. So much more so that FM transmissions can sound nearly as good as CDs, and definitely much better than the hollow sounds of old analog FM. How much better the music sounds will depend on your local stations and your radio gear.

No more static, pops, crackles or fades

The digital signal is less vulnerable to reception problems. The radio tuner’s digital processors eliminate the static, pops, hisses, and fades caused by interference. You hear only clear, clean, rich sound. Should you lose the digital signal for some reason (obstructing terrain, nearing the edge of the broadcast area, etc.), HD Radio technology defaults back to analog mode, similar to the way current radios switch from stereo to mono mode when receiving a weak signal.

hdradio3Transmission of additional information

Another benefit of digital radio is the radio station’s ability to transmit additional information along with the music signal. This can take the form of scrolling text on your receiver’s display, such as a song’s artist and title, station call letters, and so on. Stations can also include local and regional information, such as weather updates or even traffic alerts. HD Radio also supports Artist Experience. With compatible receivers you can view album art, logos, and more, when provided by the station.

Multicasting

In addition to duplicating their analog programming with an HD Radio broadcast, stations can subdivide the digital portion of their signal. This allows a station to “multicast” — that is, broadcast two or more programs simultaneously. Listeners might have a choice of, say, a sports game or music. These additional channels can only be received on an HD Radio tuner. But just as cable TV allowed specialized networks to flourish, multicasting provides the potential for stations to offer more niche programming — ultimately giving the listener a greater variety of formats to choose from.

iTunes Tagging

Some stations are broadcasting a tag-enabled HD Radio signal, which let you select a song for purchasing at a later time simply by “tagging” it. To take advantage of this feature, you need three things: an iPhone or 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, just press the “Tag” button when you hear a song you’d like to buy. The component saves the song information in its memory (but not the song itself). 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, a list of the songs you tagged will appear, 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.


The technology behind HD Radio

A company called iBiquity Digital has created the technology to make this happen. They license this technology to radio stations and consumer electronics manufacturers.

Unlike the conversion to digital television, consumers have a choice of whether to participate in the upgrade. In contrast to the television industry, where the analog signal was turned off by Federal decree, radio stations will continue to broadcast the analog signal along with the new digital signal. If we choose to not upgrade our radios, we can still listen to analog AM and FM radio — although we’ll be missing out on the digital-only features and multicasting channels.

How does it work?

HD Radio technology works pretty much just like traditional analog radio transmission:

  1. The radio station sends out the analog and digital radio signals, along with a third signal for text data.
  2. The digital signal is compressed before being transmitted.
  3. The three-layered signal is transmitted from the radio station’s upgraded digital transmitter.
  4. Multipath interference, caused by the signal reflecting off of buildings, is ignored by the digital radio, which is able to discern the true signal and ignore interference.
  5. Your radio receives the signal and, depending on your equipment, you hear either the digital or analog feed.

What HD Radio technology is not

HD Radio technology is not a subscription service, like satellite radio. It is the same free, over-the-air broadcast radio that we’ve always known. Only better. It is not something that consumers have to buy into. Everyone can choose to continue listening to their current radios, but eventually all AM/FM radios will incorporate digital technology. It is a natural evolution of the medium.

HD Radio is not the same as satellite radio. Rather, it’s an improvement to terrestrial AM and FM radio. Satellite radio, on the other hand, is an alternative to broadcast radio, in the same way that cable or satellite TV are alternatives to broadcast television. Even if you do have satellite radio, there are often times when you want to listen to your local station — and that’s where HD Radio comes in.

hdd_radio_disHear it for yourself

Many new car manufacturers are included HD radio in their car stereo systems. If you are thinking about buying a new vehicle, as if the one you are considering has HD radio included. If you are replacing or upgrading an older car stereo, you can get a new receiver with HD radio, bluetooth, cd and all the bells and whistles for as little as $120 these days. You can also purchase table top HD radios from places like Amazon.

Don’t have an HD Radio?

That’s ok! We’re also broadcasting on 94.5 FM over Tulsa and if that signal does not come in, you can listen online through this website, or right now on our new streaming app!

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