[BC] AM and FM IBOC Quality...

[Craig Bowman]

Ibiquity will never work on AM, I agree.  IBOC can and does work with 
the right system.  http://www.drm.org/ appears to work well and entirely 
within your channel unlike Ibiquity.

Craig Bowman


Bailey, Scott wrote:
> They should have just done all their beta testing on FM and left AM
> alone, like it is.  IBOC is never going to work on AM, in fact, I here
> there are AM's turning the IBOC off.
>
> Not to change the subject, but WSM-AM had reduced it's bandwidth to 6 KC
> sometime ago.  Now, it sounds like they turned it back up to 10 KC and
> it sounds MUCH better and the term Burt would use....ROBUST!
>
> Scott
>
> -----Original Message-----
> From: broadcast-bounces at radiolists.net
> [mailto:broadcast-bounces at radiolists.net] On Behalf Of Burt I. Weiner
> Sent: Friday, March 23, 2007 10:13 AM
> To: broadcast at radiolists.net
> Subject: [BC] AM and FM IBOC Quality...
>
> The biggest issue I believe will be in it "robustness".  The listener 
> wants to turn it on and have it be there.  So far, my experience 
> listening to IBOC in the home and in the car is that it is not there 
> all the time.
>
> One of our local stations recently switched format from classical to 
> country, but retained the classical on their FM's HD2 and on their 
> sister AM.  In listening to it on FM, and the receiver is line of 
> site to the transmitter through a large glass window, it's really 
> annoying when the receiver switches from classical to country.  Will 
> it get better once the analog is dropped and it's strictly 
> digital?  Who knows.  I have my suspicions.
>
> Listening to the classical on AM using a G.E. Super Radio, it's not 
> bad at all.  Actually, the AM is audibly easier to listen to than the 
> FM HD2.  That's the opinion of a listener - me.  With present 
> technology the HD2 will never be "CD or FM main channel quality just 
> because of what's allotted to it in bandwidth.
>
> Nighttime AM IBOC is going to be very interesting indeed.
>
> Burt
>
>
> At 10:00 PM 3/22/2007, you wrote:
>   
>> The new night-time AM IBOC decision notwithstanding...
>>
>> I have to take a bit of issue with those who say that AM IBOC audio
>>     
> quality
>   
>> isn't substantially better than the analog.
>>
>> Is it FM quality?  No, even though the promos we hear daily tell us it
>>     
> is;
>   
>> does it bring new life to music on the AM band?  Absolutely.  I realize
>>     
> that
>   
>> most AM stations have been resigned to carry sports, news, and talk
>>     
> where
>   
>> the benefits of improved audio would be negligible, but for music - the
>> audio quality is significantly better.
>>
>> It takes some work, mind you, to make it sound decent... it's not
>>     
> perfect...
>   
>> some material sounds "like satellite," as someone pointed out -
>>     
> referring
>   
>> I'm guessing to the encoding and compression artifacts (data, not
>>     
> audio);
>   
>> and it does reveal bad source material very quickly.
>>
>> All of that being said, however, if you feed quality audio in, and
>>     
> process
>   
>> carefully - by which I mean keeping the sound open, not dense, and
>>     
> being
>   
>> careful about how you handle the high bands - AM IBOC can sound quite
>>     
> nice.
>   
>> Jim Kuzman
>> WDYZ AM 990, Orlando
>>     
>
> Burt I. Weiner Associates
> Broadcast Technical Services
> Glendale, California  U.S.A.
> biwa at earthlink.net
> K6OQK 
>
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