The FCC has approved new HD Radio regulations which let FM broadcasters begin operating HD side-channels without prior approval from the Commission. The rules also expand AM stations' abilities to broadcast in HD from only in the daytime to full-time.

NAB President/CEO David Rehr said in a statement, "NAB applauds Chairman Martin and his FCC colleagues for taking a significant step today in advancing the already budding HD Radio technology. As HD Radio expands across America, we are hopeful the Commission recognizes the unique role played by local radio and the considerable public service contributions voluntarily made by stations within their communities."

The FCC was expected to finalize the rules last summer, but did not release them after some indecision over adding regulations over public interest content to HD broadcasts. The regulations passed by a 5-0 vote.