John at DIYmedia has posted a good introduction to what is now being called HD-radio, otherwise known as digital radio, or IBOC (acronym for In-Band On Channel). For the low, low price of about $500 you too can buy a digital radio capable of recieving almost-sorta-kinda-near-CD-quality audio on the FM dial, that the NAB and RIAA are tyring to ensure you can’t record.
John is writing a two-semester paper on IBOC, which I know will be in-depth and probably the definitive research on the topic when he’s done.
On his Future of Radio blog, Harry Helms also has been keeping close tabs on the debacle of IBOC.
Because digital radio hasn’t yet been federally mandated like digital TV — the FCC approved its use but it’s optional for broadcasters– analog radios will continue to work for longer than analog TVs. But that doesn’t mean the radio industry won’t shoot itself in the foot by switching over to IBOC so it can try and squeeze a few more dimes out of radio by offering 2 channels per station rather than actually offering something we want to listen to.