[IRCA] IBAC

["Dan Strassberg" <dan.strassberg@xxxxxxx>]

Patrick Griffith wrote that "there is no such thing as IBAC."

Not so! IBAC was the official name of a proposed system that used an
alternate channel for the digital signal. At that time, the two competing
proposals were IBOC and IBAC. IBAC was rejected because no "alternate
channels" were available and what was referred to as IBOC eventually became
the standard. However, critics soon realized that, at least on the AM band,
the IBOC concept was a sham and a misnomer because the digital signal really
does occupy an alternate channel--and not just one alternate channel but
two--the upper and lower first adjacents. Regardless of its official name
(and I think the official name is neither IBOC nor IBAC, but the trademarked
HD Radio, which, like the technology itself, is not even in the public
domain), IBAC (in which the A stands for adjacent) more correctly describes
the system than does IBOC. On the AM band, where the digital signal is
limited to 16 kbps for each of the two stereo channels, any allusion to HD
(notwithstanding the use of a lossy CODEC and iBiquity's disclaimor of a
relationship between the letters HD and "high-definition") is obviously as
much of a misnomer as is the term IBOC.

--
Dan Strassberg, dan.strassberg@xxxxxxx
eFax 707-215-6367






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