Nick:
All digital IBOC was specified and documented by iBiquity years ago,
so that's why you didn't see the basics repeated. Yes, the graphic
at diymedia shows the differences I referred to.
As for a test, I'm not sure what you want to test. The Radio
Magazine article was about ch-channel testing (IBOC aninterference
to analog on the same channel) bit you are recounting problems with
KRKO 1380 spilling onto adjacent channel KAST 1370. In either case,
all you need to form a real world opinion are your ears.
Chuck
________________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Nick
Hall-Patch <nhp@xxxxxxxx>
Sent: Friday, April 22, 2016 4:15 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled
It's quite easy to correlate Chuck. Just add ignorance and stir. I
don't believe they actually said anything much about the digital
signal, so assumption of all digital IBOC can reasonably be added to
that mix. (other details about demodulation of the analog signal are
also missing)
Audio examples would be nice, and might help to convince the doubters.
http://www.radiomagonline.com/deep-dig/0005/broadcast-engineering-conference-radio-technology-forum-sessions/37600
offers descriptions of the conference sessions, but I haven't been
able to quickly track down any more detailed results than what Dennis
linked to.
http://diymedia.net/old/stuff/AM_IBOC_Test.pdf has a nice graphic on
the first page which I assume is what Chuck is alluding to in terms
of the difference between present IBOC and all-digital IBOC. Is
that the case Chuck? If so, perhaps you could suggest a listening
test that could be done with today's systems (thereby saving me the
trouble of doing it incorrectly)? Those secondary OFDM subcarriers
already sound pretty nasty on KRKO's signal this morning, and they
would be stronger in the digital only version.
best wishes,
Nick
At 05:03 22-04-16, you wrote:
>...
>
>I don't see how you can correlate hybrid IBOC to all digital IBOC.
>What you hear with KRKO/KAST is different from what you will hear
>with all digital as the power spectrum and subcarrier levels are
>vastly different.
>
>Chuck
>________________________________________
>From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Nick
>Hall-Patch <nhp@xxxxxxxx>
>Sent: Friday, April 22, 2016 4:51 AM
>To: Mailing list for the International Radio Club of America
>Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled
>
>I presume "D/U" abbreviation in this piece refers to "desired / undesired"?
>
>I wonder if someone recorded audio from those tests, rather than just
>tossing dB's around? I have a recording of KAST-1370 from this
>morning that says otherwise, with KRKO-1380 IBOC sidebands about 25dB
>down and....welll, KAST is readable, but I wouldn't say it's lacking
>interference. The noise becomes really dominant if KAST is less
>than ~15dB above the IBOC level.
>
>best wishes,
>
>Nick
>
>
>
>
>At 21:05 21-04-16, you wrote:
> >http://www.radioworld.com/article/all-digital-am-co-channel-lab-tes
> t-results-unveiled/278670
> >
> >Sent from my iPad
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