[BC] Bitrates

[Goran Tomas]

--- At 22.4.2007 09:30, Glen Kippel wrote: ---
>On 4/22/07, Goran Tomas <gtomas.lists at gmail.com> wrote:
>>
>>I'm writing an article on digital broadcasting systems and I'm
>>looking for some information.... So, what is the typical bitrate used
>>for digital AM (IBAC)? What is the maximum bitrate that can be used?
>>I suppose IBAC uses HDC codec?
>>
>>-------------
>
>IBAC?  How could that be IBAC, since that stands for "In-Band, Adjacent
>Channel"?  Like, a station on 1000 kHz having a digital on 1010?  I thought
>IBAC was considered for use on FM, on the even frequencies -- 100.8, for
>example, but the whole idea was shot down some years ago.  Now the plan is
>"In-Band, On Channel" -- IBOC.  Anyway, I don't know the bitrate.  You might
>check with iNiquity, as it's their proprietary system.

 From the discussions here it somehow got stock with me that the AM 
system is IBAC and FM IBOC... If that's not true, my mistake. I 
haven't really paid attention on the transmission side of this. 
Though, looking now at the occupied spectrum of iBiquity's AM system 
it does extend all the way to the 15kHz on each side...

Anyway, I'm interested in bitrates and codecs. In reading some of the 
iBiquity papers, it looks like 20kbps is available for audio? I'm not 
sure if service mode MA2 doubles that to 40 kbps or just increases 
robustness in case one sideband is undecodable?


Regards,
Goran Tomas