HD Radio does not stand for high-definition radio. Two separate digital technologies emerged in the early 2000s to greatly improve broadcast radio: satellite radio and a terrestrial technology known as HD Radio. The added benefit of multicasting, transmitting multiple broadcasts simultaneously in the same channel, has also made digital radio a popular favorite. Furthermore, sound quality is improved thanks to the ability of digital methods to transmit higher audio frequencies in a limited bandwidth. For FM radio, noise is less of a problem but multipath fading and shorter range have also caused quality problems.Īll of these issues diminish considerably or go away completely when digital techniques are deployed. Lightning, power lines, and other noise sources have always degraded AM performance on all but the most powerful stations. More important is the incentive to improve broadcast quality and reliability. The state of digital and modulation technology made it possible, providing a “just because we can” factor. The impetus for the development of digital broadcast radio is multi-faceted. Both are widely available but neither has fully replaced analog AM and FM. Yet digital radio has finally emerged in several forms, namely satellite radio and HD Radio. Analog radio has persisted because it’s “good enough” as is and still making money for its stations. ![]() Most homes have cable or satellite TV, both of which today are primarily digital as well. homes get their TV over the air using this standard. In 2009, the original NTSC analog TV systems were shut down in favor of the ATSC 8VSB digital television standard now implemented in all U.S. On the other hand, TV started as an analog technology but is now only available in a digital format, at least in the U.S. Thousands of analog AM and FM radio stations broadcast daily to millions of radios across the nation. ![]() Table Of Contentsīroadcast radio continues to be primarily an analog venture, at least in the U.S. Satellite and HD Radio both are digital forms of broadcast radio, but they’re very different. There’s AM and FM radio, as well as satellite and HD radio. If you like to listen to the radio, you have a few choices.
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