[EAS] [BC] Youtube video of the LA county RMT - 2014

[Harold Price]

Dave,

Kenneth gave good instructions here for the general case of headers 
showing up in odd places, and everyone who has not done so should 
heed his advice and check out our audio tuning white paper on the FAQ page.

In this particular example, though, it might be something slightly 
different, though it is hard to say because the provenance of the 
video is uncertain.

The video seems to start with the alert already in progress, so we 
hear only one and a half headers.  I think this is an artifact of the 
process that captured the video and prepped it for YouTube, and not 
what actually went on the air.  In this case, it is not the output 
audio feedback into the input problem.  I could be wrong, but the 
quality of the header audio is pretty good.

 From the text of the crawl, this isn't Sage equipment that is doing 
the insertion (we don't use the word "effective" in the FCC-required 
header portion of the crawl).  But the info I provide on the content 
is generic,  and the extra tone may well have been leaf in upstream 
anyway, possibly by an ENDEC.

I think what happened here is that the audio as received by the 
device that is captured in this video already included the extra 
attention tone.  An ENDEC, for example, monitors the input and 
removes attention tone until it stops.  If, after a pause, there is a 
second or even third attention tone, the ENDEC doesn't remove it, and 
will include it in the audio playback.

What we hear in this case is headers, then a clean tone originated by 
the device being recorded, and then a 2nd or 3rd generation copy of 
attention tones that were probably sent as audio by the upstream 
source - maybe LASD, but maybe an intermediate station(s).  The 
upstream station detected the tones from its source, and did not 
remove them, so they slipped though as part of the audio message.  Or 
the audio as received from the originator was bad enough that the 
original set of tones was not detectable.  Keep in mind that this is 
a year ago, and LASD has been making continued improvements.

I've gone though all this to explain what I think is being heard 
here, and to answer Dave's question about his ENDEC. There is a 
tuning parameter in the ENDEC that can help detect the original tone 
in the case of noise - ATTN Threshold (on the levels tab).  The 
default is 25, a better setting is 7.  If the audio that arrives at 
your ENDEC already contains an extra attention tone, it won't be 
extracted no matter what - the adjustment must be made 
upstream.  Make this adjustment help your ENDEC remove the first 
attention tone, however.

Harold

At 09:43 AM 9/30/2016, Kenneth Otto wrote:
>Your final duck tones seem to be preceeding your passage of the 
>starting duck tones. I suspect your volume levels for tones are too 
>high or you have unassigned audio inputs which are set to detect EAS input.
>1. Never use Sage EAS audio defaults. See their support site for 
>audio advice. Adjust and measure audio levels to comply.
>2. Disable any unconnected inputs from the mix of inputs detected 
>for EAS. It's in the manual which is also online.
>I had the same problem before I made changes.
>Ken
>
>On Sep 30, 2016 9:33 AM, "Dave Kline" <dkline at tvmail.unomaha.edu> wrote:
> >There is Two, Two-Tone Attentions signal in the youtube link below.
> >We have that happen sometimes here.
> >The box (SAGE in our case) records the incoming TTAS and plays it 
> back as a part of the announcement.
> >Does anybody know what causes that?
>
> >----------------------------------------
> >Dave Kline   UNO-TV/Mav Radio/KVNO
> >----------------------------------------
>
> >On Sep 29, 2016, at 10:35 PM, Sean Donelan wrote:
>
> >>https://www.youtube.com/watch?v=ec6eQ4FRX9Y
>
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