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FM IBOC

C

Chris_Milwaukee

First of all, I'd like to take a moment to say that the engineers ROCK! I am a radio fan and a listener and I just want to let you guys know that there are a few of us who appreciate all the work you do so I have a station to listen to. Thanks to all the engineers!

I was listening to WDRV out of Chicago and they had a liner that said that they were now broadcasting in "crystal clear digital" signal. My question is, do FM stations have the same IBOC thing going on the way the AM side does? Or are they just broadcasting a digital signal on one of the subcarriers?

Thanks so much. Engineers are the TRUE professionals in radio.

Chris from Milwaukee
 
> First of all, I'd like to take a moment to say that the
> engineers ROCK! I am a radio fan and a listener and I just
> want to let you guys know that there are a few of us who
> appreciate all the work you do so I have a station to listen
> to. Thanks to all the engineers!
>
> I was listening to WDRV out of Chicago and they had a liner
> that said that they were now broadcasting in "crystal clear
> digital" signal. My question is, do FM stations have the
> same IBOC thing going on the way the AM side does? Or are
> they just broadcasting a digital signal on one of the
> subcarriers?
>
> Thanks so much. Engineers are the TRUE professionals in
> radio.
>
> Chris from Milwaukee
>


Wellllllll..... The HD Radio signal is a series of carriers that reside on either side of the analog signal. So it is similar to AM in that aspect.

FYI, The Brew, WKKV, WKTI and WKSH are all in HD Radio in Milwaukee.
 
> First of all, I'd like to take a moment to say that the
> engineers ROCK! I am a radio fan and a listener and I just
> want to let you guys know that there are a few of us who
> appreciate all the work you do so I have a station to listen
> to. Thanks to all the engineers!
>
> I was listening to WDRV out of Chicago and they had a liner
> that said that they were now broadcasting in "crystal clear
> digital" signal. My question is, do FM stations have the
> same IBOC thing going on the way the AM side does? Or are
> they just broadcasting a digital signal on one of the
> subcarriers?
>
> Thanks so much. Engineers are the TRUE professionals in
> radio.
>
> Chris from Milwaukee

IBOC AM and IBOC FM are similar but different..Basically it is OFDM carriers on either side of the main signal (which is why AM stations have to reduce their audio to 5 kHz MAX. FM stations don't have that problem due to the wide bandwidth of a FM channel and data rates involved.

http://en.wikipedia.org/wiki/IBOC Has some non techical info and history on IBOC

If you Google IBOC or What is IBOC, you can get plenty of info on the subject.

I love the stuff iBiquity puts on their web site though:

"iBiquity Digital's IBOC technology further combats interference through our unique First Adjacent Canceller (FAC) technology. FAC automatically differentiates between the digital sideband transmission and other analog signals that might be closely adjacent to the channel in order to suppress the interfering station."

Yeah never mind the fact IBOC AM DOES tear up the adjacent channel with noise and garabge!! Geesh...
 
> (which is why AM stations have to reduce
> their audio to 5 kHz MAX.

I thought we went through 'the drill' and
basically pointed out that this is not a
'cast in stone' requirement (5 KHz audio that
is).

_Jim
 
> > (which is why AM stations have to reduce
> > their audio to 5 kHz MAX.
>
> I thought we went through 'the drill' and
> basically pointed out that this is not a
> 'cast in stone' requirement (5 KHz audio that
> is).
>
> _Jim
>
For AM IBOC to work, the audio must be reduced...at least less than 7 or 6 kHz..
5, 6 ,7 doesnt matter....the analog audio has to get cut lower than it current 10 kHz limit...if you have audio in the sidebands where the OFDM carriers are, you wont be able to decode the digital.
 
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