"Bob Miller" wrote in message
news
On 26 May 2006 19:59:14 -0700, "RHF"
wrote:

What's an IBOC?

In Band On Channel digital AM and FM, where a digital audio signal is
transmitted on the same frequency as the analog one, receivable on a radio
equipped to receive the IBOC signal. IBOC was the develpmental name. Google
HD radio and iBiquity, the developer, to read more. There are aboutr 1200 HD
staitons on the air already, covering most of the population of the US
(nearly 80%)