Broadcast Watermark Analyzer
& Monitor
Installation and Users Guide
For product P/N: 2001-00367
Software Version 1.0
Manual Rev v1.1 • February 2017
p/n 1490-00170-001
TVC-15 Installation and Users Guide
© 2017 TLS Corp. All rights reserved.
About 25-Seven Systems®
25-Seven Systems specializes in audio technologies and products that address the unique
problems of radio broadcasters, networks and content providers. The company was launched
in 2004 by a group of veteran broadcasters with extensive audio experience and a significant
portfolio of intellectual property. 25-Seven joined The Telos Alliance® in 2012. Its products are
designed and built in the United States.
The installation and service instructions in this manual are for use by qualified personnel only.
To avoid electric shock, do not perform any servicing other than that contained in the operating
instructions unless you are qualified to do so. Refer all servicing to qualified personnel
This instrument has an autoranging line voltage input. Ensure the power voltage is within the
specified range of 100-240v. The ~ symbol, if used, indicates an alternating current supply.
This symbol, wherever it appears, alerts you to the presence of uninsulated, dangerous
voltage inside the enclosure – voltage which may be sufficient to constitute a risk of
This symbol, wherever it appears, alerts you to important operating and maintenance
The instrument power supply incorporates an internal fuse. Hazardous voltages may still be
present on some of the primary parts even when the fuse has blown. If fuse replacement is
required, replace fuse only with same type and value for continued protection against fire.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
The product’s power cord is the primary disconnect device. The socket outlet should be
located near the device and easily accessible. The unit should not be located such that
access to the power cord is impaired. If the unit is incorporated into an equipment rack, an
easily accessible safety disconnect device should be included in the rack design.
To reduce the risk of electrical shock, do not expose this product to rain or moisture. This
unit is for indoor use only.
This equipment requires the free flow of air for adequate cooling. Do not block the
ventilation openings on the rear and sides of the unit. Failure to allow proper ventilation
could damage the unit or create a fire hazard. Do not place the units on a carpet, bedding, or
other materials that could interfere with any panel ventilation openings.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
This equipment generates, uses, and can radiate radio-frequency energy. If it is not installed
and used as directed by this manual, it may cause interference to radio communication.
This equipment complies with the limits for a Class A computing device, as specified by
FCC rules, part 15, subpart j, which are designed to provide reasonable protection against
such interference when this type of equipment is operated in a commercial environment.
Operation of this equipment in a residential area is likely to cause interference. If it
does, the user will be required to eliminate the interference at the user’s expense. Note:
objectionable interference to tv or radio reception can occur if other devices are connected
to this device without the use of shielded interconnect cables. FCC rules require the use of
shielded cables.
“This digital apparatus does not exceed the Class A limits for radio noise emissions set out
in the radio interference regulations of the Canadian department of communications.”
“Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques (de Class A) prescrites dans le règlement sur le
brouillage radioélectrique édicté par le ministère des communications du Canada.”
This device complies with the requirements of the EEC council directives:
nn 93/68/EEC (CE MARKING)
Conformity is declared to those standards: EN50081-1, EN50082-1.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Trademarks and Licenses
TVC-15, Voltair, and 25-Seven are trademarks of TLS Corp. All other trademarks are the
property of their respective holders.
All versions, claims of compatibility, trademarks, etc. of hardware and software products
not made by 25-Seven which are mentioned in this manual or accompanying material are
informational only. 25-Seven makes no endorsement of any particular product for any
purpose, nor claims any responsibility for operation or accuracy. We reserve the right to
make improvements or changes in the products described in this manual which may affect
the product specifications, or to revise the manual without notice.
This document and its content are copyrighted by 25-Seven and TLS Corporation and
may not be copied, reproduced, or distributed in any form without expressed written
Certain libraries are licensed to You under the terms of the GNU General Public License,
Version 2 (“GNU GPL”). Telos is not allowed to sub-license these libraries to You as You are
deemed to have Your own direct license from the original licensee. Telos does not modify
these libraries in any way. Telos hereby offers to You, upon Your request and for the actual
costs of materials and shipping, all source code and object code files for all such GNU
libraries contained in the Software. Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Everyone is permitted to copy and
distribute verbatim copies of this license document, but changing it is not allowed.
Features and operations of TVC-15 are determined largely by software. 25-Seven Systems
strives to provide the most stable and feature-rich software available. We encourage you to
check for software updates from time to time by visiting our website or by contacting us
We welcome feedback on any aspect of our products or this manual. In the past, many
good ideas from users have made their way into software revisions or new products. Please
contact us with your comments or suggestions.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
We support you…
By Phone/Fax
You may reach our 24/7 Support Team in emergencies by calling +1 216-622-0247. For billing
questions or other non-emergency technical questions, call +1 216-241-7225 between 9:00 AM
to 5:00 PM USA Eastern Time, Monday through Friday.
By Email
Non-emergency technical support is available at
By Web
The 25-Seven Web site has a variety of information that may be useful for product selection
and support. The URL is
You must contact Telos Alliance before returning any equipment for factory service. We
will need your unit’s serial number, located on the back of the unit. We will issue a return
authorization number, which must be written on the exterior of your shipping container.
Please do not include cables or accessories unless specifically requested by the Technical
Support Engineer. Be sure to adequately insure your shipment for its replacement value.
Packages without proper authorization may be refused. US customers, please contact
25-Seven Technical Support at +1-216-622-0247. All other customers should contact local
representative to make arrangements for service.
All Telos Alliance products come with a 5-Year Limited Warranty.
Take a moment to activate your coverage online at:
The full text of the Warranty appears at the end of this manual.
25-Seven Systems | The Telos Alliance
1241 Superior Ave. Cleveland, OH 44114 USA
+1 (216) 241-7225 |
+1-216-622-0247 (24/7 technical support)
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Table of Contents
Background and Overview.....................................................................1
Electronic Measurement and Your Ratings............................................................................ 1
TVC-15 Benefits.....................................................................................3
About 25-Seven, Watermarking, and You............................................................................... 5
Monitoring & Analysis of Station Encoding........................................................................... 5
Controlling Voltair Enhancement in Real-time...................................................................... 7
TVC-15 Operator Features......................................................................................................... 8
Instant Gratification: Quick Hookup Guide............................................11
TVC-15 Operation.................................................................................15
Front Panel Controls............................................................................................................... 15
LCD Screen............................................................................................................................... 16
Jog wheel and Escape button.................................................................................................. 16
TVC Screens..............................................................................................................................17
Automatic Adaptive Enhancement.......................................................26
How AE “thinks”...................................................................................................................... 26
TVC-15’s Voltair Screen........................................................................................................... 27
Browser-based Remote Control............................................................35
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Troubleshooting and Updates..............................................................44
Technical Specifications........................................................................45
5-Year Warranty...................................................................................46
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Background and Overview
Electronic Measurement and Your Ratings
Broadcasting is a numbers business. Your success depends on what kind of audience you
attract and hold. Audience size and composition is measured primarily by reports from
private ratings agencies, and for most broadcasters, there’s a direct link between those
reports and a station’s revenue.
How Watermarking works
Ratings agencies base these reports on listener panels, where each panelist represents
many people in a market. In electronically measured markets such as the top 48 markets in
the USA, panelists wear portable devices called meters. These meters register unique digital
codes broadcast by each cooperating station. Thousands of these codes can be created in
the course of an hour. In theory, whenever a panelist hears a station—on their car or home
receivers, in a store or restaurant, or even from a colleague’s Internet computer speaker—
the meter hears the station’s code, and the ratings system registers the listening.
The codes themselves sound something like a fax signal, and aren’t pleasant to the ear… so
they’re deliberately ‘masked’ under louder sounds in the programming, in a process called
watermarking. Masking is a psychoacoustic phenomenon that keeps us from hearing
certain combinations of sounds, even though electronic meters can still detect them. But
there are more than a hundred possible digital code symbols used by the meter based
system, and each requires slightly different characteristics in the masking sound.
A proprietary watermarking encoder provided by the ratings agency sits in your air chain,
and looks for masking opportunities where it can embed hidden codes. When it hears a
potential mask for a current digital code symbol, it generates the symbol and mixes it with
the programming. Unfortunately, masks are evanescent, appearing and disappearing as
your content changes… sometimes, many times per second. So the number of codes you can
broadcast is also constantly changing, depending on your programming. Some content is a
lot better at supporting watermarks than others. Silence doesn’t support them at all.
nn Got a talk show with a musical introduction? Chances are the intro will have more
encoding opportunities than the talk.
nn Running a sports show or drama? Scenes with just play-by-play or dialog probably
won’t be encoded as well as those with crowds or other busy backgrounds.
nn Playing a commercial or promo? Our research indicates a sung jingle usually encodes
better than a dry voice-over… even though the spoken words might be more important
to the selling message.
Furthermore, masking requires the code symbol to be significantly softer than the masking
audio. As your content gets softer, the encoding hardware has to make the codes softer.
Environmental noise around the listener can interfere with those softer codes, even if
your listeners don’t mind the noise: Humans are very good at tracking meaningful voice
or music in a noisy environment. Meters, unfortunately, aren’t as smart: It’s possible that
a watermark signal, sent by the encoder at levels where it wouldn’t be annoying in a quiet
environment, doesn’t get detected by panelists’ meters in the real, noisy world.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Bottom line
The viability of your station’s watermarks is constantly varying, depending on your
programming, the panelists’ environments, and other variables. Changes can happen as
quickly as individual syllables in an announcer’s voice, or traffic noises on the highway.
Having good tools—ones that help you understand the entire electronic measurement
ecosystem—is essential to your station’s competitive picture.
What can be done?
25-Seven put years of research and testing into the technical issues with watermarking,
and our groundbreaking Voltair processor works with your station’s encoder to enhance
watermarking codes as they’re being generated. Voltair’s enhancement can be varied
by the station to accommodate different programming styles, and controlled by station
automation for different dayparts.
Many stations have found Voltair effective to help make their electronically derived ratings
a better match for the audiences they know they’ve got, and more reliable during hard-toencode programming.
But to really manage this kind of problem, you have to be able to quantify it.
Both Voltair and hardware provided by ratings agencies include ways to measure how
encodable a program stream is. Voltair’s can be particularly helpful, with a minute-byminute front panel display of code reliability, techniques to reduce randomness when
calibrating Enhancement settings against ratings reports, and optional downloadable
history reports and Excel graphs of a station’s coding activity.
But neither system can give you moment-by-moment measurements of how well each
element in your programming supports watermarks.
And neither system takes this information to the next level, actually adjusting
enhancement levels in real-time to compensate for the wide variety of sounds that keep a
radio station interesting.
You need to understand the entire electronic rating system. You need tools that can quickly
and precisely measure how it works. And you need efficient ways to apply this knowledge
so it can optimize your station’s product.
That’s why we developed TVC-15.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
TVC-15 Benefits
Every 400 milliseconds — 150 times per minute — TVC-15’s tone verification codec
analyzes the actual code symbols in any audio you feed it.
nn Raw symbol reliability is displayed on a constantly changing bar. The symbols that
make up a complete station identification message are then processed through our
proprietary algorithms.
A front panel graph of your station’s watermark reliability updates every 400
nn That’s fast enough to track individual program elements, or style changes in a song, or
even the difference between a host and a call-in guest.
A front panel timer updates every time your station broadcasts a complete Watermark
nn It takes 4.8 seconds for the watermark system to assemble enough code symbols
for full station identification. Under ideal circumstances1 TVC decodes a complete
message every 4.8 seconds. Each time you do, the timer resets and appropriate
message details are displayed.
nn During periods of low masking (silence, spoken word, some music), the timer doesn’t
get as many chances to reset. It keeps counting, and changes color to alert you to the
TVC-15 doesn’t depend on a particular encoder, and doesn’t have to be connected to it.
nn You can connect TVC to an air monitor. Or to an Internet radio, a HD receiver, or any
other way listeners are getting a signal with watermarking codes. Use any convenient
analog source, and get an instant reading of how strong its codes are.
nn TVC is switchable between encoding formats: Layer 1 (used for US radio) and Layer 2
(Canada and some other countries).
nn You can equalize or distort the signal going to TVC, to simulate low-quality radios. Or
you can feed TVC from a microphone pointed to any radio or loudspeaker, in a quiet
test room or noisy public space2.
nn You can bias TVC’s measurements using statistical noise simulation. Or you can
record actual environmental noise and other possible interference, and mix it with
the signal you’re feeding TVC.
nn You can feed it other stations’ signals, to assure code reliability across a broadcast
group… or even see how your competition is encoding. All this can happen in the
privacy of your own local network, with nobody else able to see how you’re making
programming decisions.
nn TVC’s front panel and reports even identify when it sees different encoders, so you
can scan multiple signal sources and sort them out later.
1 Ideal circumstances depend on the right programming, low levels of environmental and transmission noise,
and possibly a bit of Voltair enhancement. Our users have been able to reach this ideal frequently.
2 You’ll need a mic and preamp, but probably have plenty of those.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
TVC-15 will work from any source, real-time or recorded.
nn You can feed TVC recordings of your own or other stations’ signals, whether they’re
from your program line, off-air monitors, or recordings from public spaces.
nn You can use it offline with a spare encoder, to analyze program segments or
production elements. TVC’s fast response lets you compare different sub-elements
within a program stream.
nn You can use it with an automated switcher to cycle among various stations and
program streams in your group, to verify that encoders are working.
nn Operation is completely flexible: Input can be switched between program sources or
among different encoders without the need to recalibrate or reboot.
TVC-15 gives you downloadable reports and remote readouts.
nn You can access TVC’s password protected real-time display from any connected
computer, even over the web. You’ll know in an instant how well your programming is
supporting watermark codes.
nn You can download csv3-formatted daily history reports of minute-by-minute actual
code reliability, for custom analysis or for display in a program like Excel. Reports are
private and you control who sees them.
And optionally, the big benefit for Voltair users:
TVC-15 can control your Voltair in real-time!
TVC-15’s Intelligent Adaptive Enhancement [AE] closes the feedback loop, letting you
dynamically control Voltair processing based on moment-by-moment analysis of your
actual air signal.
You can take coding enhancement beyond simplistic “set and forget” or daypart setting
strategies. TVC and Voltair work together like a continuous, intelligent automatic gain
control on your hidden watermarks!
Have male and female hosts in a conversation? Got a call-in guest on a very compressed
cell phone? Airing a stopset with jingles, dry announce, and produced sweepers? TVC-15
lets you compensate for all their different encoding requirements, continuously and with
minimum annoyance to your listeners.
nn Feed TVC-15 with your air signal, give it your Voltair’s log-in address, and AE will
constantly adjust your connected Voltair to provide just enough enhancement for the
watermark confidence you want to achieve… while protecting the sound you want for
your station, with minimum noticeable processing changes and artifacts.
3 Comma Separated Values, a readable text file format that’s also easy to import into other programs.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
About 25-Seven, Watermarking, and You
25-Seven has been following electronic audience measurement since its introduction. We’ve
spoken with program directors and engineers around the world, getting their perspectives
on the overall system architecture, and on the results of their optimization efforts. In 2014
we introduced Voltair, which revolutionized how stations optimized their airchains.
To develop Voltair, we also relied on the collective expertise of our colleagues in the Telos
Alliance. Their knowledge of audio processing, coding technology, and ancillary data
streams relates directly to audio watermarking.
But our experience goes deeper than Voltair. The head of our research and development
team, Dr. Barry Blesser, is considered one of the founders of digital audio technology.
Blesser, a former President of the AES and professor at M.I.T., invented the first commercial
digital reverb product for EMT in 1976. He has been a technical and management consultant
for more than 40 years, and is recognized for contributions to a wide range of professional
disciplines, including audio signal processing, auditory perception, pattern recognition, and
architectural acoustic analysis.4 Benefiting From TVC-15
Monitoring & Analysis of Station Encoding
It’s vital to know that your watermarking system is working properly. Common wisdom in
radio today is, “If you aren’t encoding, you might as well be off the air.”
But there aren’t many ways to verify when you’re encoding. The standard watermark
encoder provides only a simple “no code” warning and basic error messages on an LCD. It
won’t alert you if a program stream is only marginally supporting watermarks. You might
miss a lot of message opportunities before there’s an alert.
The monitoring facility in Voltair is more powerful, sending initial warnings when 15
seconds have gone by without a valid message, and adding more warnings as the condition
gets longer. Its front panel and optional downloadable reports give a minute-by-minute
analysis of coding confidence, and lets you simulate how various forms of environmental
noise will affect it5.
But both the standard encoder and Voltair’s analysis can look only at the codes as they are
being generated. Before those codes get to a listener, they’ll often pass through a composite
clipper or some data compression. Then they can be hit with transmitter issues or RF
interference. In some installations, watermarking is also affected by airchain equalization
or multiband compression.
4 In 2006, MIT Press published Blesser’s book Spaces Speak, Are You Listening? Experiencing Aural Architecture.
5 Of course, most stations also use Voltair’s primary function: Enhancing the watermarks even during marginal
programming, and giving their signal a better chance of being recognized by real-world panelists’ meters.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
You wouldn’t consider your audio monitoring complete without a tuner, internet receiver,
or some other form of real-world verification.
TVC-15 lets you do the same thing for your encoding.
You can feed TVC-15 with any audio signal: from a monitor receiver, a consumer radio that’s
flipping station-to-station, a field recording, a remote microphone, a router or patchbay…
any source of analog audio.
On top of that, our sophisticated algorithms bring confidence analysis to levels that were
never before possible with any system.
nn Near-instantaneous response:
nn TVC-15’s signal strength bar continuously responds to signal strength in the
frequencies used by watermarking.
nn It takes 400 ms for the encoder to create a valid code symbol, so TVC’s front-panel
graph updates that quickly: 150 times per minute. That’s fast enough to indicate
the differences when two on-air hosts have a conversation, or distinguish a
sung jingle from a donut voice-over. The most recent two minutes of confidence
measurements are displayed on a scrolling graph.
nn A complete identification message requires 12 valid code symbols, carried on a
combination of 10 different frequency channels. As soon as a valid ID is received,
TVC’s front-panel timer starts counting. If it takes too long for TVC to see a new
valid message, the timer changes color.
nn More detailed information:
nn A detailed 0 – 100% display of the likelihood each potential message will be
nn Identification tags for each encoder. You can tell at a glance which of your
streams—or your competitors’—is being analyzed6.
nn The timestamp encoded in each successful message. You can tell at a glance if an
encoder’s clock isn’t accurate, a situation which can interfere with reliable ratings.
nn Complete remote access:
nn TVC has a built-in, password-protected web server. You can log in with any
connected browser, and assign different users the ability to either monitor TVC’s
readings, or remotely control its behavior.
6 The watermark system uses arbitrary IDs that don’t include station call or frequency. So TVC assigns a simple
letter code to each new Encoder it recognizes, and then displays that code whenever it sees watermarks from
that Encoder. You can rename any code for convenience: Main, HD2, 103.5, or whatever else makes sense.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
nn Downloadable full reports.
nn TVC’s internal web server also lets you download a complete analysis of every
signal TVC has received, available for any day it’s been turned on. TVC reports
are available as detailed files of each 4.8 second complete message analyzed over
the course of a day, or as one-minute averages. They’re in csv format, so you can
analyze them with your own software, display them as an Excel spreadsheet,
or compare them with station ratings reports. Reports are available only by
password-protected log in: You control who sees the data.
Controlling Voltair Enhancement in Real-time
Voltair caused a revolution in station processing, enhancing watermarksso they’d have a
better chance of being picked up by panelists’ meters… even when a signal didn’t support
watermarking perfectly, or when a panelist was in a noisy environment. Voltair doesn’t
create ‘phantom panelists’ in the ratings system, but it helps make sure stations get credit
for the listeners they really have.
Unfortunately, too much enhancement can actually
discourage listeners, breaking through the masking phenomenon, making watermark
messages audible in the program stream. Listeners may hear this as extra noise or
distortion. In extreme situations, they can be chased away.
It’s a question of balance: You need enough enhancement to make codes reliable even
during hard-to-encode program segments, or when there’s a lot of environmental noise.
But you don’t want to annoy listeners. How much enhancement is “too much”? It depends
on the program material, listening situation, and even listener expectations—the right
enhancement for a news talk show might be too much for a high-quality acoustic music set.
Voltair includes tools including a “toggle test,” to calibrate the amount of enhancement. It
lets you add controlled amounts that can be correlated with ratings reports, so users can
run their own tests. It also lets you preset three different Enhancement levels with GPIO
control: you can have an “emergency watermark boost” button in master control, change
enhancement when the host turns on his microphone, or have your station’s automation
system change enhancement for different dayparts.
But to get the highest level of control you’d need a trained operator, constantly monitoring
your actual on-air signal with TVC, and continuously adjusting Voltair’s enhancement for
different air talents, audio sources, noise levels, and quality requirements. An operator who
knows the personality and sound you want to present. One who’s subtle enough to control
watermark enhancement while avoiding abrupt or annoying changes. One who can pay
perfect attention 24 hours a day, 7 days a week…
TVC-15’s Intelligent Adaptive Enhancement can be that operator.
TVC-15, together with Voltair, closes the feedback loop around your watermarking
ecosystem. It acts as a “smart AGC” for Voltair enhancement, monitoring actual encoding,
and adjusting the amount of enhancement as quickly as twice per second. But like a good
transmitter processor, you can fine-tune its behavior to preserve your station’s unique
sound, setting minimum desirable confidence levels, as well as maximum enhancement to
annoying artifacts, how quickly enhancement can be changed, and more.
Finally: complete, full-time control over ratings enhancement levels!
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
TVC-15 Operator Features
TVC-15 gives you a live, highly detailed display of actual watermark symbols, evaluated
every 400 ms. for confidence, completeness and reliability.
Our proprietary algorithms constantly analyze the input signal, looking for valid code
symbols that the system combines to build meaningful station identifications. The input
can be any real-world source: your off-air signal (or a competitor’s), a test file from a
production studio, an Internet stream, or even a live mic listening to a sample radio or a
public space7. If there are symbols hidden in the audio, TVC-15 will report their details.
The front panel LCD8 is arranged for maximum usability:
Time since last complete message
This reports minutes and seconds since the last successfully decoded message. It flashes
green and restarts from 00:00 whenever a complete and coherent message is received.
nn Continuously short timings are good: They mean the program includes a lot of
reliable messages. The display will be green.
7 If you’re using a remote rig to put a live mic in a distant space, particularly a rig that uses cellphone connections, be careful. The compression used in these systems may distort or destroy code symbols. Run some
controlled tests on your equipment to compare remote versus wired connections first.
8 Or remote version in a connected Web browser.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
nn Longer times between restarts mean the programming isn’t supporting codes well.
The display changes to yellow if ten seconds have gone by with no messages, to red
if thirty seconds have gone by. While there may be exceptions, chances are a station
won’t be identified during those times.
nn The Interval Display is constantly updating, and gives you a quick go/no-go indication
of the current signal.
Last Complete Message Received
This is based on the actual Encoder ID that accompanied the last valid message, along with
an optional display of the time stamp that accompanied it9. Encoder IDs are arbitrary and
set by the ratings agency, and don’t include a station’s call letters or frequency. So TVC-15
identifies them simply as Encoder A, Encoder B, and so on. You can rename them easily
(to show call letters, frequency, HD stream, or any other useful tag), and TVC will use that
name every subsequent time it sees that encoder.
The end of this line includes a short nickname in quotes. This nickname is used for flags at
the bottom of the Main Confidence Graph.
Simulated Environmental “Noise Loading”
If everyone listened to broadcasts using headphones, the signal would go straight from
the receiver into human ears. If they also used an adapter cable, it could go straight into a
panelist’s portable meter as well. But most listening is done with speakers, and in a variety
of acoustic environments. Whether a panelist is driving their car, attending a sports event,
or in a bar that has radio or TV for background, ambient noise is a factor that can affect
how portable meters receive your code. So, to help gauge the impact of different noisy
environments, we let you apply various levels of simulated noise.
25-Seven’s Voltair is designed for real-world, real-time watermark evaluations while a
station is broadcasting. It lets you simulate different listening situations with built-in
recordings of actual random-noise environments (traffic with car honks, households with
baby cries, dishes clattering in restaurant) and apply them to your measurements.
TVC’s, however, can also be used for accurate offline comparisons of different program
streams. The randomness of real-world noise can affect these comparisons, depending
on each programs’ timing. So TVC can generate a signal to simulate real-world noise in a
repeatable way. It acts as a constant “load” on the watermark energy. It lets you compare
different programs with the confidence that environmental noise will have a similar
influence on each. You can also use this Noise Loading to scale TVC’s measurements, for
more convenient analysis and graphing.
If you want, you can substitute your own noise source instead. This can be recorded
environmental noise that you mix with the test signal before feeding to TVC. Or it can be a
live mic in a real-world space, picking up both your program and the location’s actual noise.
9 The timestamp, in HH:MM format, is based on a code broadcast by the Encoder. For real-time signals, it should
be within a minute of real-world time. If this isn’t accurate, check your Encoder.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Main Confidence Graph
This shows the confidence level for complete messages during the past two minutes. A
complete message consists of twelve individual code symbols in a valid pattern, so TVC-15
draws a new Confidence line every 400ms. The line height displays zero to 100% confidence,
and its color provides a quick visual reference:
nn Dark green lines indicate 80% confidence or better. This can be the result of
programming choices, Voltair enhancement, or a combination of both.
nn Light green lines show at least 40% confidence. Many of your watermarks will
probably get through, unless there’s a lot of environmental noise.
nn Orange lines show at least 30% confidence. Watermarks may be gettinglost.
nn Red lines show less than 30% confidence,. There’s a good chance panelists’ meters
won’t register your station at all, even if they’re actively listening.
nn No line at all is rare, but can occur during prolonged silences.
Code Symbol Strength Bar
This white line constantly changes height to show the strength of potential code signals
in watermark channels. This bar reacts instantly, to provide visual feedback that encoding
could be taking place. Actual code symbols require 400 ms to broadcast, and they’re
measured and displayed in the Main Confidence Graph.
Encoder Nickname Tags
These are abbreviated from the encoder name, and mark each time a complete message
comes through. The tag will be either the last word of the name, if it’s short enough to fit on
the graph; or the first three letters of the last word.
Two Minute History
The time display on the bottom of the Confidence Graph is calibrated in minutes:seconds,
based on TVC’s real-time clock10, to help you correlate confidence readings with moment-bymoment changes in your programming. This is not the time-stamp encoded on watermark
Other user controls
TVC-15 includes complete, flexible control over its operation. Clock and system settings,
network access, how TVC controls a connected Voltair, and remote passwords can be set
from the front panel. Most of these settings, along with maintenance and customization
functions, are also available remotely using any web browser.
10 Which can be set manually, or pointed to a Network Time Server.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
TVC-15 Quick Hookup Guide
This section explains, very briefly, how to get TVC up and running so you can monitor
TVC is a versatile device, with other setup options we couldn’t include here. So these
instructions might not be best for your specific setup. More information about menus and
commands, technical installation details, and web access appear later in these pages.
In other words, we urge you to read the rest of this manual. You’ll learn the best ways to
use TVC-15 in your station, how to get the most reliable watermark analysis, and how it can
be paired with a Voltair—if you have one—for complete, continuous on-air Enhancement
1. Give it a home
Mount TVC-15 in a rack that has adequate power, a wired connection to your data network,
and access to the audio signal(s) you want to test. Proper cooling is important: make sure
the vent openings aren’t blocked, and don’t mount TVC immediately above or below other
equipment that generates heat.
TVC-15 does not need to be close to your encoder or other airchain processors. You can put
it in master control, a production room, or even the PD’s home.
2. Connect the analog input
nn Use the Input A Left (1) input for mono signals, and both Input A jacks for stereo.
TVC accepts +4 dBu balanced analog on XLR3 male. This can come from a routing
switcher, AoIP node, small mixer, or any other standard audio source.
Input B is reserved for future expansion.
TVC’s input gain is not adjustable. If you need to analyze unbalanced computer
outputs or mic-level signals, use an external preamp or mixer.
11 Most of us got into this business because we like to play with equipment. Feel free, and use this chapter as a
quick guide. But when you’re done, read the rest of this manual… there are plenty of TVC features you can’t
discover just by poking around.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Most users will feed TVC from a patchbay or routing switcher for convenience. The
source can be any point in your airchain after the watermark encoder, an off-air
monitor tuned to any encoding station, a computer receiving an internet stream,
a live mic near a radio… virtually any encoded signal you want to analyze. You can
switch among signals freely, without having to recalibrate or change any settings on
Warning! If you’re also using TVC as an intelligent controller for Voltair
Enhancement, you obviously want to analyze the same signal that Voltair
is enhancing. But be aware that latencies become an issue, if TVC’s monitor
signal is derived after HD or other delays.
There’s a necessary trade-off between a TVC/Voltair pair’s ability to react
quickly, and how well it can control a delayed signal.
3. Connect it to your network
Connect TVC-15’s RJ-45 Ethernet Network jack to an appropriate data network, via Cat5
cable or higher. This connection is used to synchronize with an NTP server, for browserbased remote control, for downloading data reports, and for maintenance. It doesn’t carry
IP-based audio.
If TVC is set for its default DHCP addressing, it will attempt to register with your router.
TVC can always be operated from its front panel, regardless of whether it’s made a
successful network connection.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
4. Power up
Connect TVC-15’s to 110-240 volts, 50-60 Hz, nominal draw 55 watts. You can use the IEC cord
provided, or any other standard cord. TVC has a rear-panel power switch; you may leave
that switch on if it’s connected to switched rack power.
Turn TVC-15 on. After an initial boot sequence of approximately 30 seconds, the front panel
LCD will look something like this. If an encoded signal is being fed to the unit, the Main
Confidence Graph will also show vertical bars scrolling in from its right side.
5. Start analyzing!
TVC-15 will respond to any encoded signal being fed to it. You can feel free to experiment
now, changing its settings from the front panel. Then read the rest of this manual for
details on what those settings do, how to extend control over your network and to your
station’s Voltair, and how to retrieve TVC’s data for further analysis.
6. Try some adjustments
Most TVC operations can be controlled from the front panel12.
On-screen Help
Press to Confirm
The JOG wheel can be turned to scroll through menus and fields on the screen, highlighting
each. It’s also a button: if you press the wheel, it acts as a Confirmation button to select the
highlighted menu or screen area. Once you’ve Confirmed a selection, turning JOG will scroll
you through the selected item’s possible options.
12 Most functions can also be controlled from a password-protected web browser (see chapter on Browser
based Remote Control). A few functions require transferring files to or from TVC, and must be done with a
connected computer.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
The ESCAPE button returns you to next higher level. If you’ve been entering values in a
field, it stores the value, exits the field, and takes you back to selecting other fields in the
area. If you’ve been selecting fields, it takes you back to selecting menus on the right side of
the screen.
Unless you’ve assigned TVC-15’s Intelligent Adaptive Enhancement to a specific Voltair13,
it won’t affect your air signal. So feel free to make an initial exploration of settings and
But remember: there’s a lot more TVC-15 can do. Read the rest of this manual for details.
13 TVC-15’s intelligent Adaptive Enhancement function is too powerful to summarize here. There’s a full chapter
on it, later in this manual.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
TVC-15 Operation
Here’s a full description of how to TVC’s front panel controls and LCD screen for normal
setup and operation.
Front Panel Controls
The JOG Wheel can be turned to navigate among menu items and fields, pressed to focus
on a screen area, and turned to change a selected field’s value14. If you’re entering text, the
wheel has an additional functions; see later in this chapter.
The ESCAPE button can be used to exit a field and save its value, or to exit a screen area
and go back to the menu.
14 These operations are different if you’re controlling TVC-15 from a password-protected browser: Click the
computer’s mouse to choose a menu item or field, use the up and down arrow keys to select a value for the
field, and press the computer’s Escape key to confirm when you’re done.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
LCD Screen
This is TVC’s “Dashboard”, where you use various screens to control operation and monitor
watermark confidence. A few features are common to every screen:
The TVC’s name, in white letters, is an identifying name you’ve assigned to this specific
hardware. These names can be helpful if you’re using multiple TVCs on a network. The
Screen Name (black letters) identifies that Screen’s function.
You choose which screen should be active—and what function you want to adjust—by
scrolling through the Menu on the right of the LCD. Scroll by turning the JOG wheel, and
then select your choice by pressing the wheel15.
Every screen has a dynamic HELP area along the bottom. Help messages are contextsensitive and will change depending on what you’re doing. The messages are sometimes
shortened to fit on one line, but their meanings are always obvious.
Jog wheel and Escape button
These let you select menu items or individual fields on a screen, and then change their
nn Turn the JOG wheel to select a menu item, and press the wheel to see the related
nn Now you can turn JOG to select a specific field on that screen, and press it to enter
that field.
nn Once you’re in the field, turn JOG to change its value. When you’re satisfied with the
change, press ESCAPE to save the data and go back to selecting fields, and escape
again to return to the menu.
15 If turning JOG selects other fields in the middle or top of the screen, rather than menu items, it means your
Voltair is in Adjustment mode. Press ESCAPE to get back to the Menu.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
nn You can also press JOG to save data… in most cases. But pressing the wheel has a
slightly different function when entering text (page 00), so it’s best to use ESCAPE
TVC’s Function Screens
Each screen displays or lets you control a different function. During normal operation,
you’ll probably leave it on the Main screen most of the time16. The others are for
maintenance and system monitoring.
Main Screen
Choosing either Display or Adjust on the menu shows a Main Screen:
nn Display is the normal ‘resting’ mode, and lets you evaluate watermarks while
guarding against accidental parameter changes.
nn Adjust lets you control the amount of noise loading, and may also be used for
adjusting future functions.
nn The Main Screen’s areas are explained in an earlier chapter on Operator Features.
16 Some stations have their processor racks visible to casual visitors. In that case, you can leave TVC’s display on
something less informative to competitors, such as the Clock screen.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
System Screen
System Name: The name you set here will appear at the top of each screen, both on the LCD and on
connected computers. Use it to identify machines in a facility that has multiple TVCs
in a rack or being controlled over the same network, and as a guide for users who might
be reading TVC analysis on their smartphones or tablets. The name also appears on
downloaded TVC reports.
Entering names and other text in TVC-15: This is easiest from the browser on your computer, using its keyboard. But you can
also enter text or change text fields from the front panel, using just the JOG wheel and
First, turn the wheel to select a field, and press it to enter that field.
Names and passwords can be any length up to 20 characters. Upper and lower case letters,
numerals, and punctuation – [hyphen] _ [underscore] and . [period] are allowed. Spaces are
not allowed: names and passwords must be continuous.
You choose the character you want from a scrolling list. The last character in the list is a
blank. Blank does not work as a space, but as a specialized delete key:
nn When [blank] is hit in the scrolling list, it erases every letter that follows it in the
word; if you then scroll to a different character on the list, those letters come back.
nn If you press ESCAPE while [blank] is selected, it stores the shorter word.
Use [blank] for fixing mistakes, or when replacing a long name or password with a shorter one.
Here’s the general procedure: When you press JOG on an item, the first letter of the item is
highlighted. Scroll to select the character you want to use, then press the wheel to confirm
it and move to the next letter. When you’re done, ESCAPE to save the new name.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Or step-by-step: Let’s say we’ve selected System Name, and want to change it from TVC-15
to FM_air…
User Action
Screen looks like
Press JOG
Selects first letter position
Turn JOG
Scroll until desired character shows
Press JOG
Sets that letter, moves to next position
Turn, press, turn…
As above, to complete name
Saves name and exits. JOG now selects other lines on
the screen.
To correct errors:
This is what you want to change.
Press JOG, press JOG,
Advance to letter that should be changed. Replace it
with something else. The letters that follow won’t be
All screenshots in the table are from AlphaEntry.tif
If you ESCAPE after changing a letter to something else, the other letters aren’t affected
and the new version is stored.
If you ESCAPE while [blank] is showing, the letters that follow it are also erased; the new
shorter name is stored.
You can also change the System Name from a connected web browser. Letters and numbers
are provided by the keyboard; [blank] is provided by the space bar and works like the frontpanel version. The list of usable characters is the same.
The main difference is that on a computer, you select a field by pointing and clicking, and
then you can enter text from the keyboard.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
tvcweb Password tvcview Password These offer separate protection for the two different levels of remote operation. These
levels are described in the chapter on Browser Control.
Full Web Access appears on the screen as tvcweb. View-Only Access appears as tvcview.
Use tvcweb or tvcview as the login names, when you want to access this remote operation.
The factory default password is tvc for both levels. We recommend changing each to a
different password as soon as you’ve put the unit on a network.
Show Message Timestamp TVC can read the timecode that’s added by a station’s watermark encoder, and display it
with the Last Message Received text at the top of the Confidence Graph. This time display
might be confusing. Depending on how you’re using TVC, the time displayed on the bottom
of the Confidence Graph might not match the Timestamp.
nn Select Enabled to show the timestamp, to get full information you’re analyzing
real-time analog broadcasts. You’ll also see instantly if the Encoder’s clock has been
properly synchronized, which can be helpful in trouble-shooting.
nn In some situations where you’re analyzing pre-recorded programming, or monitoring
with very high latency, operators might be confused by the difference between
displayed timestamps and the real-time clock on the bottom of the Confidence Graph.
In this case, set Show Message Timestamp to disabled.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Network Screen
This screen tells TVC how to communicate with your data network for remote control,
maintenance, and synchronization with a Network Time Protocol clock. Its appearance
depends on how you’ve set the first line [DHCP]. You change that setting by using JOG and
ENTER, just as you do on other screens.
DHCP: Enabled With DHCP [Dynamic Host Configuration Protocol] Enabled, TVC gets its network settings
automatically from your router. In that mode, the Configure Network screen looks like this:
The address fields show blanks when DHCP is on, because those addresses are determined
by your router and you can’t change them.
If you want to control TVC from an external browser while DHCP is enabled, you’ll need
to know the IP Address your router has assigned. This can be found on the Status screen
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
DHCP: Disabled If Disabled is selected in the DHCP field, the Configure Network screen looks like this:
You’ll need to set the four number lines manually:
IP Address: A unique network IPv4 address for this TVC.
Subnet Mask: A subdivision of an IP network that will include TVC.
Gateway: The router or proxy server that shuffles data between networks. In simpler
networks, this will often be
DNS: A constantly updating Internet service that translates readable domain names to
numeric IP addresses.
Services that access the Internet, such as Network Time Protocol, require valid Gateway
and DNS settings.
Each number in the IP Address, Gateway, and DNS lines are separate fields; Subnet Mask
is a single field with preset choices. Navigate to a field with JOG, press the wheel to enter it,
and JOG to the desired number. Then you can press the wheel again if you want to jump to
the next field on the line, or ESCAPE to save the data and navigate to another line.
DHCP or not?
If DHCP is enabled, TVC’s IP address may change when you restart. This affects how users
will log in for remote control. If DHCP is disabled, you’ll need to manually enter valid
numbers on the four lines. These numbers are determined by the way your network is set up17.
17 It gets complicated. If you’re not sure what’s best in your station, contact your IT department. Many small
business networks use DHCP and never worry about addresses.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Clock Screen
TVC’s clock should be accurate so you can correlate watermark confidence values with the
signal source or programming you were feeding it at a particular time. Turn the JOG wheel
to highlight the Clock menu, and then press the wheel to enter the page.
Network Time Protocol You can enable Network Time Protocol to automatically set the date and time, or you can
disable it and set them manually.
nn If you’re enabling NTP, you must provide a valid server address. It can be our default
server at, or a different master clock your station prefers. Enter the
server name using alphanumeric control as described above.
When you first enable NTP, TVC-15 sends a message to the server specified on the screen.
Then it synchronizes with the server’s clock. The process takes slightly less than a minute.
You can check NTP login and synchronization status on the Status screen.
nn If you’re disabling NTP, you should set the Date and Time manually.
Whether or not you’re using NTP, you can specify time zone and standard or 24-hour
(military-style) time display. The JOG wheel, ESCAPE button, and fields work as you’d
expect from other screens.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Adaptive Enhancement Screen
TVC can continuously and precisely control Voltair Enhancement, if your station uses it, for
optimum watermark strength with minimum annoying artifacts. It acts like a very tunable
AGC, keeping your station’s Voltair always in the enhancement “sweet spot”.
This screen is where you adjust TVC’s Adaptive Enhancement [AE] to work with your
Voltair and reach your station’s goals.
Depending on how you set AE:
nn It will raise the enhancement when your programming doesn’t support watermarks
nn It will lower enhancement when it isn’t necessary, to reduce the chance of listeners
being annoyed by audible codes.
nn It lets you specify a target range for watermark reliability.
nn It lets you set enhancement value limits, so it never goes too high or low.
nn It lets you fine-tune the responsiveness to catch fast changes in the programming,
while avoiding over-reactions or problems with delayed monitoring signals.
nn It even lets you adjust how gently or abruptly Voltair will change the enhancement
amount, so listeners aren’t annoyed by obvious changes in your station’s sound.
This function is powerful and sophisticated, and its controls are interactive. Read the
detailed chapter on Adaptive Enhancement before making initial adjustments.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Status Screen
This read-only screen is for checking TVC’s operational state. It reports changes in real-time.
NTP Status shows if TVC’s is using a Network Time Clock. It can display disabled,
searching, or synchronized. To change the status, go to the Clock Screen.
The IP Address should be noted if you plan to log in remotely; it’s where you’ll point your
browser. This address is displayed correctly, regardless of whether you’re using DHCP or
not. You can change IP settings on the Network Screen.
Mask, a number that follows the IP Address (24 in this screenshot), is used for network
The MAC Address identifies TVC’s networking hardware, and is unique for each system.
You may need this information to set up your network router.
Temperature shows the TVC hardware’s internal temperature.
Encode Layer refers to the encoding protocols used in your market. All US radio markets
use Layer 1. If you’re using the systemin a different country, your local standard might be
Layer 2. If in doubt, ask your dealer. The Layer can be changed from TVC’s Web Interface.
Version identifies the firmware currently running on your TVC.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Adaptive Enhancement Control with Voltair
If your station is using Voltair Enhancement, TVC-15 can work with it to provide more
continuous, reliable, and consistent watermarking. This feature helps assure the maximum
number of watermark codes will reach panelists’ meters, with a minimum of audio artifacts,
no matter what you’re broadcasting.
nn It takes control of your Voltair, constantly changing the amount of enhancement to
give you the best results.
nn It’s like a super-alert operator with one eye on TVC-15 and one hand on Voltair: one
who knows exactly how you want to fine-tune enhancement for the most reliable
ratings and happiest listeners, working every minute you’re on the air!
nn It can compensate almost instantly—within ½ second, if needed—for changes in
talent voices and styles, program features, production, spots, or even solo sections in
a song.
nn It’s fully tunable. You set the desired confidence range and how your Voltair will
respond to it.
nn You can even set it up to analyze dynamic real-world environments, like the crowd at
a ballpark, and compensate for changes as needed.
Processors like Omnia give you tight, responsive control of your on-air
sound… Now TVC-15 gives you the same kind of control over encoding
How Adaptive Enhancement Control “thinks”
To control a Voltair, TVC starts with a fairly simple goal: If it sees watermark confidence
go down, it adjusts Voltair’s enhancement up; if it sees confidence go up, it adjusts Voltair’s
enhancement down.
While that goal is simple, TVC’s other goals are maintaining a station’s artifact-free sound
to help keep listeners, while maintaining robust codes that help keep a station profitable. It
takes a lot of processing to meet all these goals at once.
Some of the things it does 150 times per minute:
1. TVC measures the per-symbol encoding confidence of any compatible watermark
signals it finds in the test audio, across all ten channels of the watermark system;
2. TVC runs this and previous confidence measurements through our weighted
averaging process, smoothing the numbers to create an accurate, constantly updating
evaluation of the signal;
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
3. TVC applies these smoothed confidence readings to a series of user-specified
comparisons and enhancement goals—
a. if confidence is equal to or higher than your specified target, TVC sets its desired
enhancement value to the bottom of your specified range,
b. if it’s equal to or lower than the target, TVC sets the value to the top of your
c. if it’s between the targets, TVC interpolates a value from your specified limits;
4. TVC measures the difference between its current desired control value and the
previous one, and then limits the rate of change based on your individual speed
settings for raising and lowering the enhancement levels;
5. TVC issues commands to the connected Voltair, setting its enhancement to the
calculated desired value.
400 ms later, TVC repeats the process:
6. If there hasn’t been a change in step 2’s smoothed value or your specified limits, it
continues the step 4) process and approaches the desired enhancement value at your
specified speed.
7. If there has been a change, it adds that factor to the result.
The ever-vigilant operator from our analogy—the one who has one eye on TVC and one
hand on Voltair—would have beads of sweat by now. TVC does it easily.
TVC-15’s Adaptive Enhancement Screen
You can control Adaptive Enhancement [AE] from the front-panel menu or via passwordprotected Web interface. Each adjustment has a specific and important purpose.
Voltair AE Control: The first line lets you Enable or Disable the Auto Enhance function. When it’s disabled,
Auto Enhance settings are still visible and can be adjusted.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Remote Voltair address: TVC reaches across your local network to control a specific Voltair18.
You can have multiple TVCs controlling multiple Voltairs on the same network. The only
management required, other than keeping track of IP addresses, is that you make sure TVC
and its associated Voltair are looking at the same program stream19.
Voltair’s address is IPv4 format with four numbers separated by periods. Each number
must be between 1-255. Get these numbers from the Status screen of the desired Voltair
unit (either from its front panel or its Web interface), or you may be able to read them from
your network router’s administration page.
If you’re reading an address from Voltair, copy the first four numbers on its IP Address line
( in this screenshot). Enter them as the Voltair address on TVC’s Voltair screen.
If your Voltair is configured for DHCP, its address may change during a
reboot. TVC has no automatic way of knowing the new address, and will
lose control. See the Voltair manual or contact your IT department for more
Voltair port:
This will usually be 8259, the port on which Voltair accepts enhancement commands. In
special networking situations, your IT department may ask you to enter something else.
18 Voltair must have firmware version 2.3.3 or higher. See the Voltair manual for details.
19 Otherwise you might have your telephone talk show’s Voltair controlled by a TVC that’s analyzing your
new-age folk show. That would be silly.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
So much for the basic settings. Now we get to fine-tuning.
These interactive settings influence both how robust your watermarks
will be, and subtle aspects of your station’s sound. You’ll need a basic
understanding of our control algorithms, explained below. You’ll probably
also want to experiment, and to share experiences with other TVC users in
your group.
Confidence smoothing: xx seconds TVC applies a continuous, logarithmically decaying average to the individual 400 ms.
symbol confidences it detects. The setting tells it how much weighting to apply to past
symbols; or in other terms, how slowly the smoothed result changes based on new
information. It uses the result to control the rest of the Automatic Enhance function.
Choose a duration between .5 and 30 seconds20.
A short duration will react almost instantaneously to program changes. This can give you
the fastest, tightest control over watermark enhancement.
For example, this drawing illustrates 2 second smoothing21:
The thin vertical lines are individual 400ms confidence levels on the Main Confidence
Graph. The horizontal scale is sixty seconds of continuous broadcasting. The thick purple
line is the result of 2 second smoothing. It reacts tightly to the measured density of code
symbols, but not so fast that Enhancement changes radically depending on talent’s
individual syllables. It could be a good setting for a talk station.
20 Durations less than one second are primarily for testing your system, and usually aren’t practical in day-today broadcasting.
21 It’s a very simplified figure. Our algorithms are more complex.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
But in some circumstances, this responsiveness can cause problems.
Consider a situation with fifteen seconds of total latency, because of delays in STL, HD
transmission, and the link from a remote air monitor.
Keeping our 2 second illustration above, TVC sees a smoothed confidence dip around :07
on the drawing. This reflects very low confidence while talent was talking a few seconds
earlier. TVC will boost Voltair’s enhancement to compensate.
But Voltair’s place in the program stream is fifteen seconds ahead of the monitor! Those
talent words were a relatively long time ago. When TVC’s boost command is received,
Voltair is already processing the music shown around :20. The requested boost could be too
much for that music, and cause annoying artifacts.
And if we let this happen, it will cause abnormally high confidence levels when TVC finally
sees the music section. TVC will lower Voltair’s Enhancement to compensate, resulting in
abnormally low confidence.
At best, very fast smoothing, coupled with long transmission and monitor latency, is
unpredictable. At worse, it goes into a Enhancement control feedback oscillation. Neither
is good for your signal or appreciated by your listeners.
Compare that situation with this drawing, representing :15 second smoothing:
The roller-coaster ride is over. TVC still reacts to confidence changes in the air signal, but
wild gyrations have been eliminated. There’s much less chance of feedback oscillations, and
the air signal won’t have as many abrupt changes.
And delays can get even longer, requiring more smoothing. We’ve seen some stations’
Internet streams with a one-minute latency!
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
The takeaway?
nn Use a shorter smoothing time for tighter control of rapidly changing programming.
A talk show with male and female hosts, telephone guests, and produced sweepers or
spots can get more reliable measurements this way, and in our experience listeners
are more forgiving of high levels of enhancement on this kind of program than on
nn But don’t use a short smoothing time if there’s long latency between your Encoder /
Voltair pair and TVC’s input source.
Some common data compression schemes may affect watermark reliability. So there
can be reason you want TVC to monitor HD or Internet broadcast streams at the
receiver, the way listeners will hear them. If you’re using AE in this kind of situation,
set smoothing for a longer time. You’ll still get precise control, even though it will be
slowed down to avoid latency oscillations.
If you want very fast control of a delayed HD or Internet stream, we suggest you
first do tests using the delayed monitor point and a long smoothing time. Try
different control range settings (below), and settle on ones that work best with
your programming and audience. Then switch TVC’s input to a point before the
latency—perhaps from a monitor port on your airchain processor—and shorten the
smoothing time.
nn In all cases, it’s worth experimenting.
There are more ways to fine-tune TVC’s automatic enhancement, giving you even
more control and fewer objectionable artifacts.
Control range pairs:
Smoothed Confidence of aa % or less… …sets enhancement to bb and
Smoothed Confidence of cc % or more… …sets enhancement to dd These four controls work interactively. They determine when, and how much, TVC changes
Voltair’s Enhancement. They’re best understood with a few graphs.
The first and third lines, Smoothed Confidence of nn %... , set the range TVC uses
to adjust the Enhancement value. Within that range, TVC will make adjustments to
Voltair’s enhancement. When Confidence goes beyond that range, TVC freezes at the last
enhancement value it calculated… until Confidence returns to being within the range.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
If you couldn’t set the Smoothed Confidence range—that is, if TVC responded linearly to
every change in the Smoothed Confidence, with no limits—you could graph its behavior
like this22:
The vertical scale shows the Smoothed Confidence value, from zero to 100%. The horizontal
is the amount of Enhancement that TVC tells Voltair to apply.
The slanted purple line shows a constant relationship across the whole range of confidence:
at 100%, Voltair applies zero Enhancement; at 50% confidence it applies 12 units of
Enhancement; at zero confidence, Voltair unleashes its full 24 units of Enhancement.
But in our experience, code symbols are more likely to fall into the middle of that range
than the at extremes. We take advantage of that, squeezing more of the control activity
into the center:
If we set Smoothed Confidence of 80% or less as a practical maximum, and Smoothed
Confidence of 20% or more as a minimum, the graph now looks like this:
At any value of 80% or higher (vertical purple line on the extreme left), TVC sets Voltair
to Enhancement. At any value of 20% or lower (extreme right), TVC sets Voltair to the
22 These are also simplified graphs and numbers for explanation, not a detailed reflection of everything TVC does.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
In between (diagonal section), Voltair responds with a full range of Enhancement values.
…sets enhancement to: For a lot of programs, zero Enhancement is never enough, and 24 Enhancement is always
too much. These sets enhancement configuration settings are like Goldilocks: they let you
specify “too little” or “too much” Enhancement for a program. TVC interpolates between
these values as needed.
For example, let’s keep the two Smoothed Confidence settings at 80% and 20% as above.
We’ll apply enhancement limits of 18 at the least confidence, and 6 at the highest. Your
screen would now look like this:
With these four settings, the graph looks like this:
At any confidence of 80% or higher, Voltair applies 6 units of Enhancement. That minimum
amount won’t bother listeners of most programming, but provides enough boost to
enhance watermarks in moderate environments.
Between 20% and 80% confidence, Voltair applies a range of Enhancement levels: more
when it’s needed; less when it isn’t.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
But no matter how low the confidence gets, Voltair never applies more than 18 units
of Enhancement… a limit should keep code symbols from becoming annoying in many
That’s just for the example above, of course. You’ll be tuning your TVC to get the best
results with your programming and your audience.
These settings, together with TVC-15’s ability to quantify the confidence of
each 400 ms. code symbol, give you unprecedented control over your station
rating’s reliability… with a minimum of listener annoyance!
Be aware the numbers in this manual are just a tutorial. They’re based on
typical formats and circumstances, and your station should be anything but
nn use these numbers only as a starting point,
nn do your own fine-tuning,
nn compare the results against your own judgment of air sound, and your
own ratings reports.
One more set of controls lets you fine-tune how TVC controls Voltair with AE:
Max enhancement increase: x units per second
Max enhancement decrease: y units per second
Some watermark artifacts will always be detectable by golden-eared listeners with ideal
surroundings. These artifacts can be particularly annoying if they’re abruptly switching on
or off: the ear hears sudden changes much better than it can hear gradual ones. Even the
most golden ears can be fooled if artifacts fade in or out slowly enough.
So these last two settings control how quickly TVC attempts to change the Enhancement
level. The amount of change is determined by the settings discussed earlier; these control
the speed. You can set any number between 12 and 0.1 units/second (or, between 8 ms and
ten seconds for each new unit of enhancement change to reach Voltair).
A faster speed tracks your programming better, but may make it easier for listeners to hear
the changes. A slower rate lowers their chance of thinking “something is wrong with the
signal” if a broadcast requires constantly changing high levels of Enhancement.
You may find the best combination is a fast increase to keep up with program changes,
coupled with a slow decrease to confuse listeners’ ears… similar to the independent
adjustments of attack and decay controls on an airchain processor.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Browser-Based Remote Control
Almost all of TVC’s front-panel functions can be controlled remotely, by logging into its
internal password-protected server with a browser. The Confidence Display can also be
monitored on tablets or smart phones.
TVC supports three different kinds of Access:
nn Front Panel Access uses TVC’s LCD, JOG wheel, and buttons. It does everything
required for normal operation. Full details are in the previous chapter.
nn Some maintenance functions require a keyboard and hard drive on a connected
computer, and don’t appear on the Front Panel.
nn Full Web Access lets you control a remote version of the front panel, using the web
browser in any networked computer. It’s password-protected for security.
nn Normal analysis functions, Intelligent Automatic Enhancement settings, and basic
system configuration are accessible from the browser. The user interface is almost
identical to TVC’s front panel, except keyboard and mouse are used instead of the
JOG wheel.
nn Network-critical functions, such as assigning passwords, must be done from the
front panel. This is for security and to prevent accidental disconnection.
nn Updating firmware and downloading Confidence History reports require a
connected computer. These functions aren’t available at TVC’s front panel.
nn Some factory support situations may require you to be connected with Full Web
Access while you talk to our technical team.
nn View-Only Web Access uses a web browser to mirror the LCD’s Confidence and Real
Time Analysis displays. It’s intended for operators and management who want an
ongoing view of how well the system is performing.
nn This access level can be used on many smart phones and tablets, as well as on full
nn View-Only does not give the user any control over TVC. Settings cannot be
nn View-Only and Full Web Access can have different passwords, both programmed
from TVC’s front panel. You can restrict Full Access control to engineering and
station management, while letting producers and programmers view encoding
confidence in real-time.
A summary of available functions, by access level, appears after the following log-in
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Logging in
The procedure is the same for Full Web and View-Only Access. The only difference is the
user name and password, which change depending on the access level you want.
1. Point your browser to TVC’s IP address. This appears on the front panel’s Status
screen. If you have multiple TVCs on your network, each should have a different
2. The Mask number, which appears after the IP Address, is for system maintenance and
not used during log-ins.
3. After your browser contacts TVC, it displays an authentication request:
A username and password are being requested by [IP address]. The site says: TVC Web
a. If you want to use Full Web Access, enter tvcweb as the user. Then enter the
password you’d assigned for Full Web on the TVC front panel System screen.
b. If you want to use View-Only Access, enter tvcview as the user. Then enter its
These user names (tvcweb or tvcview) must be entered as all lower-case, exactly as
shown here and on the System screen.
Passwords are set by you on the front panel System screen. You can use upper- or
lower-case, numerals, and some punctuation, but they must be entered exactly as you
set them. Passwords can (and probably should) be different for the two access levels.
After you’ve entered the user name and password, the computer will finish logging in
and you can use TVC remotely. When you’re finished, you can log out using the button
on the upper right corner of your browser’s screen.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Access System Requirements
A single TVC will support multiple remote users, in any combination of access levels and
functions. You can have Full Web Access running in the operations center and engineering
shop, View-Only on the program producer’s computer, and another View-Only on the
General Manager’s phone. All functions work in real-time, and parameter changes made on
one computer or the front panel are reflected on every other screen.
You can also have more than one TVC running on the same data network. Make sure they
have different IP addresses23, and access each with its specific IP address. If you’ve assigned
a machine name (such as TVC_FMHD1), you’ll still log in with the IP address. The name will
show up at the top of its remote pages.
Full Web and View-Only Access run as dynamic web pages from TVC’s internal server. They
are standards-compliant, so virtually any modern web browser on any current computer or
mobile operating system will work.
Functions and Access Levels
This table summarizes what you can control or view at each of the three access levels.
Front Panel
Full Web Access
View Only Access
Login Name
none required
Login Password
none required
passwords are set by you, using Voltair’s front panel
Main Screen
Adjust Screen
Full; adjust parameter by
clicking with mouse
System Screen
Limited: no passwords
Network Screen
Clock Screen
AE Screen
Status Screen
(suitable for smart phones)
Available Tabs
History, Encoders (view only), Information
Update Software
Maintenance Logs and
23 If you’re using DHCP (page 57), this happens automatically.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Additional Control Functions
Both Full Web Access and View-Only can do more than just mirror TVC’s front panel LCD.
Both feature tabs across the top of their web pages. You can click them for additional
CONTROL This tab shows a live picture of TVC’s Front Panel LCD. Menus and specific screen functions
vary according to access level, as described in the chart above.
Since your computer has a mouse and keyboard, but doesn’t have a JOG Wheel, we made
navigation on these screens a lot more computer-like:
nn To choose from the menu on the right side of the screen, point to the item name and
nn To set any parameter that can be adjusted from the front panel, point to the
parameter field on the screen, and click. This enters the field.
nn If the parameter is normally set by scrolling through possible values (such as Time on
the Clock screen), use the up- and down- arrow keys to increment though the list24.
nn If the parameter requires an alphanumeric entry (such as machine name or the
URL of a time server), just start typing. Use the left- and right- arrow keys to
navigate through the name, if necessary.
nn When you’re finished entering something, press Escape ESC on your keyboard to
save it. Or use the mouse to select anything else on that screen, or click a menu
item for other screens. Those actions will also save the setting.
TVC’s other tabs present other functions as web pages and forms, in a style that’s intuitive
to any computer user. You can click on links, type data in fields, and use the DELETE key to
correct mistakes.
24 Depending on your browser, this might also rock the page up or down slightly. Ignore it.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
UTILITIES This tab is available only for Full Web Access, and lets you perform system maintenance.
System Software Upgrades
nn Copy upgrade package lets you upload new firmware releases. Clicking this function
takes you to a page where you can select the firmware package on your computer,
copy it to TVC’s internal storage, and then install it. The new software won’t be
activated, however, until you do the next function:
nn View or switch running firmware version lets you manage current and previous
releases. You can switch to the latest version, revert to a previous version if there’s
ever a reason, or erase obsolete versions from TVC’s storage.
nn Switching firmware versions takes about 40 seconds. TVC automatically returns to
run mode as soon as switching is complete.
TVC keeps internal track of operating parameters and software condition. If there’s a
problem, you may be asked to download and forward them during a support call.
nn Decommission unit erases all user settings and history files. These can’t be recovered,
and you’ll have to start from scratch.
nn Switch encoding to Layer… lets you set TVC’s watermark recognition protocols for
encoding standards in different countries. For US radio, this should be left on Layer 1. In
some non-US markets, Layer 2 should be used. “Layers” are differing groups of center
frequencies that encoders utilize when generating watermark tones. Some countries
use alternate or even concurrent layers to interleave different information on the
same audio. Switching encoding layers requires a system restart.
HISTORY You can download detailed or one-minute averaged confidence files for any day TVC has
been running.
The files are in .csv format, and can be opened by any text program or imported into
spreadsheet programs like Excel or and database managers.
Available information for each report includes:
nn Time: This is a timestamp from TVC’s internal clock, not necessarily what’s broadcast
by the encoder.
nn Noise loading: Indicates whether this feature is disabled, or the noise level being used.
nn Message Name: This is the name of the encoder detected by TVC. Encoder IDs
are obscure and proprietary, with no relationship to a station’s call letters or
frequency. For convenience, TVC identifies each unique encoder it encounters with
a name like Encoder A, Encoder B, etc. You can change these names to something
more memorable on the next tab. Names stick to an encoder: if TVC sees the
same encoder again it’ll use the same name—even if other encoders have been
encountered in the interim.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
If there is a blank field in this column, it means a complete message was not received
at that time. The confidence was most likely too low to be usable at that time, because
of programming issues or environmental noise.
If more than one encoder was detected during a period, then this column will be set
to (mixed).
If you’re looking at a detailed report, the other columns are:
nn Message TS: This is the timestamp being broadcast by the encoder. It takes the
format HH:MM, but might not relate to real time.
nn Message Conf: This is the confidence of each input message as analyzed by TVC. It’s
a four-decimal-place number from 0.000 to 1.000, representing the average of many
variables that TVC looks at. You can multiply by 100 to get a percentage range from
0.00% to 100.00%.
nn Minute Name: This is a summary of the Message Names, reported once per minute.
nn Minute Good: How many times a message was successfully received during the
nn Minute Possible: station encoders transmit a message every 4.8 seconds, which means
there may be either 12 or 13 complete messages in a perfectly encoded minute. This
field tells you which of those two maximums apply to that minute, for convenience
when calculating.
If you’re looking at a minute-by-minute report, the other columns are:
nn Message Good and Message Possible: these are identical to Minute Good and
Possible, above.
nn Symbol Average: this is a floating point average of how many symbols were received
during each message slot, divided by the possible message slots in that minute.
Available days are listed by month, most recent ones being at the top of the list. Click on a
day, and your browser downloads a file called TVC_MachineName_History_Date.csv. The
filename is the same no matter which type of file you choose, so if you’re grabbing both a
detailed and minute-by-minute version from the same date, change the names to keep them
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
ENCODERS tab This is a list of all the encoders this particular TVC has seen. Encoders are identified with a
proprietary code, rather than with the call letters or frequency. TVC replaces them with a
simple internal ID: Encoder A, Encoder B, and so on, incrementing each time it encounters
an encoder it hasn’t seen before.
The list also reports the most recent time TVC has seen this encoder, based on its internal
clock. Every time a new message is received, the corresponding encoder in the list will flash.
If you’re looking at the tab via TVCWeb, you can rename the internal ID with something
more convenient, like WECB 640 or Classical 102 HD1. TVC will take the last word of your
name and post it when it’s the appropriate tag, on the bottom of the Main Confidence
Graph25. You can also delete all on-screen references to an encoder.
If you’re looking at the tab via TVCView, you can see the name and most recent encounter,
but can’t make any changes.
This displays TVC status on one page for convenience, where it can be copied or printed
for your records and when contacting the factory. The same information is available in
multiple screens on the front panel.
25 In order to fit on the graph, these tags must be three characters or fewer. If the entire last word of your name
doesn’t fit, TVC will use its first three characters.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Step-by-step installation details are in the Instant Gratification chapter.
Rear panel connections
Analog audio connections
TVC is wired for line-level balanced analog audio with XLR female connectors. Like almost
all other modern equipment, pin 2 is hot, pin 3 is return, and pin 1 is ground. The connection
scheme is unterminated or “bridging”. Nominal level is +4 dBu, with 20 dB headroom.
We do not recommend unbalanced operation or other levels, which may affect accuracy. If
you want to hook it up to a computer or hifi-style output, use a buffer amplifier.
Use the Input A connectors, left(1) for mono and both for stereo. If you’re analyzing a stereo
signal, make sure the inputs have consistent polarity.
Input B is reserved for future expansion.
There are no output connections. TVC is a monitor only.
Ethernet connection
The 100M/1G LAN connector provides access to TVC’s internal Web server for remote
control, report downloads, and firmware uploads. It also connects to NTP servers when this
function is enabled.
Connect it to your router or nearby switch with standard Ethernet Category 5 or Category
6 cable, using an RJ-45 connector. This is standard for most modern computerized gear.
TVC supports auto MDI-X, so you can use a straight or crossover cable. Details are provided
later in this manual.
AoIP or other audio formats are not carried over this connector.
GPIO (25-Pin DB25)
This connector is provided for future expansion.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
AC Power
Connect to 60 cycle source between 100 and 240 volts. TVC is internally fused at 5 Amps,
but will typically draw much less: peaks of about 100 watts on startup, and under 50 watts
when running.
When you turn TVC ON, it goes through a startup procedure of about 30 seconds. The
system’s fans will run at high speed during startup, but then slow down to normal
operating level. Multiple cooling fans help ensure the processing systems stay at optimal
operating temperature, insuring a long life, and significantly lowering risk of heat related
device failures.
Keeping the unit cool will prolong its life, and protect your warranty. Make sure the vents
on both sides of the rear panel have a free flow of air at reasonable temperatures. TVC
doesn’t generate much heat, but it can be affected by heat from equipment around it. Do
not mount TVC directly above or below equipment that runs hot, or that blasts hot air
from its vents.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Troubleshooting and Updates
TVC-15 is solidly built, with rigorously tested hardware and software and collective years
of successful run time. Nonetheless, no electronic equipment is immune from occasional
problems. These pages will help you identify which ones can be fixed quickly and locally,
and which require your contacting us.
In an emergency, you can reach our Support Team anytime, by calling +1 216-622-0247.
TVC has an extensive internal logging system, engineered to ensure system integrity and
help us get to the bottom of any problem quickly. When contacting customer support, you
may be instructed how to retrieve log files so they may be emailed to us for analysis.
For non-emergency technical questions, email or call +1 216-241-7225
between 9:00 AM - 5:00 PM USA Eastern Time, weekdays. There’s full contact information at
the end of this chapter, and at the end of this manual.
Features and operations of TVC are determined largely by software. 25-Seven Systems
strives to provide the most stable and feature-rich software available. We encourage you to
check for software updates from time to time by visiting our website or by contacting us
Contacting Us…
By Phone/Fax
You can reach our 24/7 Support Team in emergencies by calling +1 216-622-0247. For
administrative questions or other non-emergency technical questions, call +1 216-241-7225
between 9:00 AM to 5:00 PM USA Eastern Time, Monday through Friday.
By Email
Non-emergency technical support is available at
By Web
The Telos Web site has a variety of information that may be useful for product selection
and support. The URL is See the 25-Seven section for TVC-15
news and updates.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Technical Specifications
We are constantly working to improve our products.
Specifications and features are subject to change without notice
nInput Impedance: >40 k ohms, balanced
nNominal Input Range: +4 dBu
nInput Headroom: 20 dB above nominal input
nA/D Conversions: 24-bit, Delta-Sigma, 256x oversampling
nAuto-ranging supply, 100VAC to 240VAC, 50 Hz to 60 Hz
nIEC receptacle, internal fuse, on/off switch
nPower consumption: 55 Watts
n0 degree C to +40 degree C, <90% humidity, no condensation
nChassis Dimensions (ex protrusions):
19” (48.2 cm) wide
3.5” (8.9 cm) height
11.75” (30 cm) depth
nChassis Weight: 14.5 lbs. (6.57 kg)
nShipping Dimensions & Weight: Contact customer support
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
5-Year Warranty
Telos Alliance Limited Warranty
This Warranty covers “the Products,” which are defined as the various audio equipment,
parts, software and accessories manufactured, sold and/or distributed by or on behalf of
TLS Corp. and its affiliated companies, collectively doing business as The Telos Alliance
(hereinafter “Telos”).
With the exception of software-only items, the Products are warranted to be free from
defects in material and workmanship for a period of five (5) years from the date of receipt
of such Product by the end-user (such date of receipt the “Receipt Date”). Software-only
items are warranted to be free from defects in material and workmanship for a period of 90
days from the Receipt Date. Telos will repair or replace (in its discretion) defective Products
returned to Telos within the warranty period, subject to the provisions and limitations set
forth herein.
This warranty will be void if the Product: (i) has been subjected, directly or indirectly, to
Acts of God, including (without limitation) lightning strikes or resultant power surges; (ii)
has been improperly installed or misused, including (without limitation) the failure to use
telephone and power line surge protection devices; (iii) has been damaged by accident or
neglect. As with all sensitive electronic equipment, to help prevent damage and or loss of
data, we strongly recommend the use of an uninterruptible power supply (UPS) with all
of our Products. Telos products are to be used with registered protective interface devices
which satisfy regulatory requirements in their country of use.
This Warranty is void if the associated equipment was purchased or otherwise obtained
through sales channels not authorized by Telos.
In no event will Telos, its directors, officers, employees, agents, owners, consultants or
advisors (its “Affiliates”), or authorized dealers or their respective Affiliates, be liable for
incidental or consequential damages, or for loss, damage, or expense directly or indirectly
arising from the use of any Product or the inability to use any Product either separately or
in combination with other equipment or materials, or from any other cause.
In order to invoke this Warranty, the Product must be registered via Telos’ website (http:// at time of receipt by end-user, and notice of a warranty
claim must be received by Telos within the above stated warranty period and warranty
coverage must be authorized by Telos. Contact may be made via
or via telephone: (+1) 216-241-7225. If Telos authorizes the performance of warranty service,
the defective Product must be delivered to: Telos, 1241 Superior Avenue, Cleveland, Ohio
44114 or other company repair center as may be specified by Telos at the time of claim.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Shipping Costs and Warranty Service:
If the date the customer’s notice of warranty claim is received by Telos (such date the
“Warranty Claim Notice Date”) is within the first 90 days following the Receipt Date, Telos
will pay the costs of shipping such warranted Product to and from the end user’s location,
and the cost of repair or replacement of such warranted Product.
If the Warranty Claim Notice Date occurs after the first 90 days following the Receipt Date
and before the end of the second (2nd) year, the customer will pay the freight to return
the warranted Product to Telos. Telos will then, at its sole discretion, repair or replace the
warranted Product and return it to the end user at Telos’ expense. If the Warranty Claim Notice Date occurs between the end of the second (2nd) year
following the Receipt Date and the completion of the fifth (5th) year, the customer will pay
the costs of shipping such warranted Product to and from the end user’s location. Telos will
then, in its sole discretion, repair or replace the warranted Product at Telos’ expense. Telos
also reserves the right, if it is not economically justifiable to repair the warranted Product,
to offer a replacement product of comparable performance and condition direct to the
customer at a discounted price, accepting the failed warranted Product as a trade-in.
The end user will in all cases be responsible for all duties and taxes associated with the
shipment, return and servicing of the warranted Product.
No distributor, dealer, or reseller of Telos products is authorized under any circumstances
to extend, expand or otherwise modify in any way the warranty provided by Telos, and any
attempt to do so is null and void and shall not be effective as against Telos or its Affiliates.
Out of warranty units returned to the factory for repair may be subject to a $500 evaluation
fee, which fee must be prepaid prior to shipping the unit to Telos. If no repairs are required,
the $500 fee will be retained by Telos as an evaluation charge. If repairs are required, the
$500 fee will be applied to the total cost of the repair.
TVC-15 Installation and User’s Guide Version 1.1 • February 2017
Connect with 25-Seven Systems
1241 Superior Avenue East • Cleveland OH 44114 USA
Main office: + • 24/7 Emergency Tech Support: +1.216.622.0247 • Fax: +
Email: •
© 2017 TLS Corp., All Rights Reserved. C17/14010
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