HD Radio - A New Option
It may not be truly high-def, but Hybrid Digital radio offers less interference and better sound than it's AM/FM cousins.
Who says radio is dead? These days, we have AM, FM, XM and Sirius satellite radio, Internet radio and HD Radio. So what’s HD Radio?
First of all, don’t confuse it with HDTV. The “HD” in the radio format does not mean “high definition,” though there are some similarities in improved performance. Some believe the HD stands for “hybrid digital,” but the HD in the name is simply part of the trademarked logo.
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[Link: electronichouse.com]