Editing Digital Audio Broadcasting (section)

===FM HD Radio versus DAB===
DAB broadcasts a single multiplex that is approximately 1.5&nbsp;MHz wide (≈1,184 kilobits per second). That multiplex is then subdivided into multiple digital streams of between 9 and 12 programs. In contrast, FM [[HD Radio]] adds its digital carriers to the traditional 270 kilohertz-wide analog channels, with capability of up to 300&nbsp;kbit/s per station (pure digital mode). The full bandwidth of the hybrid mode approaches 400&nbsp;kHz.

The first generation DAB uses the [[MPEG-1 Audio Layer II]] (MP2) audio codec, which has less efficient compression than newer codecs. The typical bitrate for DAB stereo programs is only 128&nbsp;kbit/s or less and as a result most radio stations on DAB have a lower sound quality than FM, prompting complaints from listeners.<ref>{{cite web |url=http://wo.uio.no/as/WebObjects/theses.woa/wa/these?WORKID=52348 |last=Holm |first=Sverre |publisher=Digitale Utgivelser ved UiO |title=Lydkvalitetet i DAB digitalradio |year=2007 |access-date=3 January 2009 |url-status=dead |archive-url=https://web.archive.org/web/20080501073857/http://wo.uio.no/as/WebObjects/theses.woa/wa/these?WORKID=52348 |archive-date=1 May 2008}} ([[Nynorsk|Norwegian]]).</ref> As with DAB+ or [[T-DMB]] in Europe, FM HD Radio uses a codec based upon the [[MPEG-4]] [[HE-AAC|HE]]-[[LC-AAC|AAC]] standard.

HD Radio is a proprietary system from [[iBiquity|iBiquity Digital Corporation]], a subsidiary of [[DTS (sound system)|DTS, Inc.]] since 2015, which is itself owned by [[Xperi|Xperi Corporation]] since 2016. DAB is an open standard deposited at ETSI.