Datasheet

Studio Technologies, Inc. Model 43D IFB Interface, Issue 1, Page 2
support Dante, such as the RTS ADAM® with
OMNEO®, can be routed to the Model 43D’s
Dante receiver (input) channels. The Model
43D’s circuitry will then convert these signals
into standard analog IFB audio outputs. In this
way adding IFB support for RTS + OMNEO infrastructures
is a simple task. Other matrix intercom and broadcast router
systems also directly support Dante. The Model 43D can
also be used with matrix intercom systems that don’t support
Dante. An external analog-to-Dante interface can be used
to convert analog intercom output ports to Dante channels.
For example, the Studio Technologies Model 44D Audio
Interface does an excellent job of coverting line-level analog
signals to Dante digital audio channels. Once in the digital
domain, these Dante channels can be interconnected with the
Model 43D’s audio input channels.
In applications where on-air talent uses headsets with two
earphones (stereo or “dual muff”) two unique audio channels
are typically part of the provided IFB signal source. Gener
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ally one channel is configured in a matrix intercom system as
“interrupt” while the other channel is configured as “program.”
(In U.S. applications the former signal is assigned to the left
ear and the latter signal to the right ear.) An alternate term
often used for the “interrupt” channel is “program-with-inter
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rupt.” This may be more descriptive as the function is actually
a program source that gets interrupted with talkback audio.
The “program” channel is typically a continuous source of
program audio. An alternate term is “program-only.” The
source of interrupt audio is typically a producer or director
who provides real-time information to the on-air talent.
In other applications, talent will use a single-ear headset,
“ear bud,” or in-ear monitor, keeping the other ear accessible
to ambient audio. This is frequently done in electronic news
gathering (ENG) or sports-broadcast applications where live
interviews take place. An audio source with program-with-
interrupt is provided; no program audio source is utilized.
Powered IFB Outputs
The Model 43D provides two, 2-channel powered analog IFB
outputs that are designed to directly support connection of
listen-only user devices such as the Models 32A, 33A, or 34
from Studio Technologies. Each powered IFB output provides
both DC and two channels of unbalanced audio. Two 3-pin
male XLR connectors, located on the Model 43D’s back
panel, are used to interface with the listen-only user devices.
Following broadcast-industry conventions, pin 1 is the com
-
mon connection, pin 2 has 28 volts DC with channel 1 audio
superimposed on it, and pin 3 has channel 2 audio. Each power
source supplies a maximum current of 120 milliamperes. The
power supply outputs are monitored for over-current and
short-circuit conditions. Under firmware (embedded software)
control the outputs will automatically cycle off and on to help
prevent damage to the circuitry and connected equipment.
Line-Level IFB Outputs
In addition to the two, 2-channel powered IFB outputs, the
Model 43D also provides two channels of analog line-level
IFB. The audio sources for the line-level outputs is the same
as used for channels 1 and 2 of powered IFB output 2.
The line-level outputs are intended to allow interconnection
with externally-powered listen-only user devices, inputs on
wireless IFB systems, or analog inputs on consoles or related
audio devices. The line-level IFB outputs have a nominal level
of –10 dBu and are transformer- and capacitor-coupled, help
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ing to ensure successful interconnection with virtually any
line-level analog input.
Pro Audio Quality
The Model 43D’s audio circuitry was designed in the spirit of
professional audio equipment rather than that found in typical
IFB or talent cueing gear. High-performance components are
used throughout, providing low-distortion, low-noise, and high
headroom. The Model 43D’s powered IFB output sources offer
a unique level of performance; their ability to deliver power
while maintaining audio quality is simply excellent.
Audio Meters and Status LEDs
The Model 43D provides four 5-segment LED meters. The
meters, located on the front panel, display the level of the
audio signals associated with the two, 2-channel IFB outputs.
At the time of installation and setup the meters are invaluable
in helping to confirm correct operation. During normal opera
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tion the meters offer direct confirmation of the unit’s audio
signal levels, helping to ensure that optimal audio quality is
maintained. Additional LED indicators are provided on the
front panel, offering status indications of the incoming power
and two IFB power sources.
Ethernet Data, PoE, and DC Power
Source
The Model 43D connects to a data network using a standard
100 Mb/s twisted-pair Ethernet interface. The physical
interconnection is made by way of a Neutrik® etherCON