![]() The primary station might be adult contemporary, for example, while a subchannel might offer gospel or country to broaden the station's appeal. You tune in the subchannels with a tap of a toggle or a turn of the tuning knob they appear in the display with a designation such as FM2.Ī station can have up to eight subchannels and they typically carry programming of a different music genre than the main channel. Many of the stations that have converted to HD radio in the United States have added a second (and some even a third) subchannel with different programming than the stations' main frequency. Moreover, the HD signal from AM stations is in stereo, and there is no background noise-the hiss or crackle you occasionally hear with standard radio. The HD Radio sound quality delivers deeper bass, higher treble, more stereo separation, and a greater dynamic range (the difference between the loudest and quietest sounds) than FM or AM signals.Īt its best, HD Radio pushes FM sound quality closer to that of CDs and makes AM broadcasts resemble those of analog FM. ![]() In our tests, HD Radio can live up to its promise of improved sound. Here's more on how HD Radio differs from regular analog radio: It offers better sound quality If a HD Radio signal becomes too weak, the radio will automatically switch over to the parallel analog signal. With a HD-compatible radio, the radio tunes in to the digital programming on HD stations and the analog signals for non-HD stations. With a regular radio, you'll hear the usual analog version. Stations supporting HD Radio simultaneously broadcast analog and digital versions of the same programming over the same frequency. Unlike digital TV, HD Radio broadcasts won't replace analog broadcasts (at least not in the near future) but will run parallel to them. There are more than, 2,000 HD Radio stations across the U.S., according to iBiquity Digital, the company that developed the technology. Stations often use these subchannels to provide traffic or weather information, or diverse music content.Īnd just as with AM and FM, once you have a compatible radio, there is no subscription fee for the service. It also allows stations to add more programming via several additional channels that can be broadcast "alongside" a station's main frequency. Appropriating an abbreviation from high-definition TV, HD Radio offers better sound quality than AM and FM radio bands. HD Radio allows conventional (or terrestrial) AM and FM stations to broadcast their content over digital signals.
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