FMeXtra

FMeXtra is a deprecated in-band on-channel digital radio broadcasting technology created by Digital Radio Express. Unlike iBiquity's HD Radio system, it uses any FM radio station's existing equipment and transmitter plant to transmit digital audio data on subcarriers instead of sidebands. It also requires no royalties for its use, which can run thousands of dollars per year for HD Radio because of the 3% of revenue on HD2, HD3 channels. The coverage is similar to FM Stereo, and therefore high ERP is required in larger urban areas, as with normal FM transmissions.

FMeXtra

FMeXtra is a deprecated in-band on-channel digital radio broadcasting technology created by Digital Radio Express. Unlike iBiquity's HD Radio system, it uses any FM radio station's existing equipment and transmitter plant to transmit digital audio data on subcarriers instead of sidebands. It also requires no royalties for its use, which can run thousands of dollars per year for HD Radio because of the 3% of revenue on HD2, HD3 channels. The coverage is similar to FM Stereo, and therefore high ERP is required in larger urban areas, as with normal FM transmissions.