Radio World Engineering Extra - June 11, 2014 - (Page 22)
RadioWoRld engineeRing extRa
CATCHING UP WITH LUFS
PREVENT HACK ATTACKS WITH SSHBLACK
Thank you, John Kean, for a very good introduction to LUFS measurement. Your article in
the April 16 RWEE ("A New Way to Monitor Signal Level") makes a much more interesting,
informative and entertaining read than the very sterile documentation from our friends in Europe.
My original introduction to this discipline was in connection with TV audio and normaliza‑
tion of loudness in the residential living room. With particular respect to that, I do question the
specified roll‑off of low frequencies, even to the point of ignoring the 0.1 channel in a 5.1 sur‑
round system. Claiming perfect compliance to the spec, I could see a nefarious used‑car dealer
shaking the house at 0 dBFS, thus waking the kiddies asleep in their cribs upstairs. I'm sure that
the parents would consider that "loud."
Your Fig. 2 (below), which shows the difference between LUFS loudness and program peak
levels, is telling. I would have thought that there would be more spread than the indicated 8 dB
difference between the two, implied by your markers of 10, 12 and 18 dB as min/typ/max varia‑
tions. What would be interesting
would be a third plot showing
good‑ol' VU‑meter response as
well, using true VU‑spec inte‑
gration, not what's called VU
by those who push floppy meter
movements or nonstandard "vir‑
tual" integration ahead of LED
bars or computer screen displays.
Anyhow, thanks again for
catching us up with this. I'm look‑
ing forward to how all this shakes
out as time goes on.
Founder, Inovonics Inc.
TRIBUTE TO ARNO MEYER
Thank you for the
article "Arno Meyer and
the Age of FM Stereo."
I view it as a tribute to
a quiet man and quiet
company who has served
our industry from the
sidelines for 50 years.
but never lauded for the
services and products
that we relied on to max‑
imize our transmissions while complying with the
Hip - Hip - Hooray for Arno Meyer.
E. Glynn Walden
SVP Engineering, CBS Radio
2, 12-13, 24
Arrakis Systems Inc.
NTI Americas, Inc.
On avoiding dictionary attacks ("Keep Out the Bad Guys!," April
16), I've run sshblack for many years. It watches logs and blocks IP
addresses on an excessive number of login failures. This reduces these
from thousands a day to less than 10. I also have another script that
immediately emails me on any ssh login in case someone WERE able
to get in (no one has).
Stephen Poole replies:
San Luis Obispo, CA
Hey, Harold! Nice to talk to a fellow geek. I've never tried sshblack.
I'll have to look at it. I've played with Fail2Ban, but it doesn't seem to
do quite as well as you're describing.
I would especially like to try something like that with an FTP server
that we provide for a local TV station. Their technical staff insists on
straight‑up FTP on the standard ports (I prefer SFTP).
And speaking of the ports, seriously, I'm not kidding - if at all
possible, change them. You mention having your attacks cut down dra‑
matically; ours have CEASED by switching away from port 22.
The biggest thing missing from my article was a warning that, if
you're going to use VNC, you should make sure it's encrypted. Michael
pointed that one out to me, but it had already gone to press.
Thanks for the tip!
Great article, ("Artist Experience and
Album Art Via HD Radio" April 16 issue)
extremely well‑written, concise, objective,
highly informative - thank you for taking
the time to do.
Vice President, Brand Business
Development, iBiquity Digital Corp.
INSTRUCTIONS NOT INCLUDED
Great article Alan, however my take‑away is that Artist Experience implementation needs to be much more
plug‑n‑play. Many (most?) small to medium‑sized stations have a part‑time engineer/IT person who has his/
her hands full with basic maintenance. Seems unlikely that the time could be found - even with your excellent
guidance - to slog through the assembly of this kit.
Chief Eng., KCSN(FM)
June 11, 2014
Alan Jurison replies:
Thank you for the comments, Mike, this article was an in‑depth "white‑paper" to be complex and descriptive
of the system so engineers could understand literally everything important about how it works. If you select a
third‑party AE vendor, they will take care of a lot of the details for you and provide instructions and support to
those implementing their solution.
Table of Contents for the Digital Edition of Radio World Engineering Extra - June 11, 2014
Radio World Engineering Extra - June 11, 2014
A New Twist on Wireless IP Remote Broadcasts: RPUoIP
Three Weeks to Build, Part I
Experience Brings Important Lessons
Field Observations of Elevated FM HD
Radio World Engineering Extra - June 11, 2014