Studio Technologies M380 Manual de usuario
Copyright © 2016 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50625-0916, Issue 1
User Guide
Issue 1, September 2016
This User Guide is applicable for serial numbers
M380-00151 and later with application firmware 1.3 and later
and Dante firmware 2.0 (Ultimo 3.10.1.12) and later
Model 380 On-Air Beltpack
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Model 380 User Guide Issue 1, September 2016
Studio Technologies, Inc. Page 3
Table of Contents
Revision History ............................................................ 4
Introduction ................................................................... 5
Getting Started .............................................................. 8
Operation ...................................................................... 14
Technical Notes ............................................................. 17
Specifications ................................................................ 20
Appendix A: Model 380 Block Diagram ....................... 21
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Revision History
Issue 1, September 2016:
1. Initial release.
Model 380 User Guide Issue 1, September 2016
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Introduction
The Model 380 On-Air Beltpack offers a
unique combination of audio resources,
providing main and talkback outputs,
talent cue (IFB) input capabilities, and
essential user controls in a compact,
portable package. Optimized for broad-
cast sports and live entertainment events,
news-gathering, and streaming broadcast
applications, the unit allows incredibly
simple deployment while maintaining
“pro” audio quality and an intuitive user
experience. The Model 380 integrates di-
rectly into both Dante audio-over-Ethernet
and standard analog audio environments.
With just a Power-over-Ethernet (PoE)
connection, a dynamic microphone, and
a pair of headphones or an earpiece, a
complete broadcast “stand-up” on-air
position can be created. And by using the
Model 380’s microphone output a direct
connection to an analog microphone-level
input on an associated camera, camcord-
er, or audio console is also supported. Key
features can be easily configured includ-
ing microphone preamplifier gain, talk-
back button operation, headphone signal
routing, and sidetone operation.
The Model 380’s audio quality is excellent,
with low distortion, low noise, and high
headroom. Careful circuit design and rug-
ged components ensure long, reliable op-
eration. A wide range of applications can
be supported, including sports and enter-
tainment TV and radio events, streaming
broadcasts, corporate and government AV
installations, and post-production facili-
ties. By providing the main (on-air) audio
signal in two forms, Dante digital audio
and analog microphone level, the Model
380 makes integration into a wide range
of environments easy to accomplish. And
with the talkback audio available as a
Dante output channel, routing it to inputs
on a variety of devices, such as matrix
intercom systems, audio consoles, and
monitor loudspeaker systems, is simple
and flexible.
Applications
The Model 380 on its own can provide
an “all-Dante” solution for one on-air talent
location. Two Dante audio input channels
supply the user with their talent cue (IFB)
signals. Should the cue signal be “mix-
minus” an integrated sidetone function
can provide the user with a microphone
Figure 1. Model 380 On-Air Beltpack top and bottom views
Issue 1, September 2016 Model 380 User Guide
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confidence signal. Two Dante audio
output channels, one designated as main
(for on-air) and the other talkback, are
routed via an associated local-area net-
work (LAN) to inputs on Dante-compatible
devices. A pushbutton switch, located
on the Model 380’s top panel, provides a
combination talkback and “cough” (user-
controlled audio mute) function. When
talkback is not active audio from the out-
put of the unit’s microphone preamplifier
is routed to the Dante main output chan-
nel; the Dante talkback output channel
is muted. When the talkback function
is active audio is muted on the Dante
main output channel and activated on
the Dante talkback output channel. The
audio switching is performed in the digital
domain and is virtually “click-free.”
Other applications may benefit from not
utilizing the Model 380’s Dante main out-
put channel. This typically won’t be an
issue of inadequate audio quality but
rather a need to match work-flow require-
ments. For example, for lip-sync or trans-
mission purposes it may be optimal to
have the on-air audio transported as an
embedded signal along with the associ-
ated camera video. Alternately, all on-air
audio sources may need to connect to
inputs on an audio console or console-
related I/O unit. Supporting these sce-
narios is not a problem as the Model 380
supplies a microphone output connec-
tion that’s specifically intended for this
purpose. Simply connect the unit’s micro-
phone output connection to the desired
analog input, such as the mic/line input
on an ENG-style camera—that’s it!
The circuitry associated with the Model
380’s microphone output is very simple,
essentially a passive path that routes a
signal connected to the microphone input
connector directly to the microphone
output connector. A solid-state circuit,
in series with the mic in-to-mic out path,
allows muting of the signal on the micro-
phone output connector whenever the
talkback function is active. And it’s impor-
tant to note that using the microphone
output connection doesn’t impact the
normal functioning of the Dante main and
talkback output channels. This can be
valuable, such as when utilizing the Dante
main output channel as a back-up, sec-
ondary, or redundant on-air audio signal.
Setup and Operation
Set up and operation of the Model 380 is
simple. An etherCON® RJ45 jack is used
to interconnect with a standard twisted-
pair Ethernet port associated with a PoE-
enabled network switch. This connection
provides both power and bidirectional
digital audio. A handheld (“stick”) micro-
phone or broadcast stereo or monaural
headset with a dynamic microphone can
be directly connected to the unit’s 3-pin
XLR input connector. Stereo headphones,
the headphone connections from a stereo
or monaural headset, or even a monaural
earpiece are connected to the phones
output jack.
Three “push-in/push-out” rotary level
controls make it easy to set the level of
the talent cue (“IFB”) and sidetone levels
being sent to the 2-channel headphone
output. The Model 380’s enclosure is
made from an aluminum alloy which offers
both light weight and ruggedness. A stain-
less steel “belt clip,” located on the back
of the unit, allows direct attachment to a
user’s clothing.
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Dante Audio-over-Ethernet
Audio data is sent to and received from
the Model 380 using the Dante audio-over-
Ethernet media networking technology. As
a Dante-compliant device, the Model 380’s
two output (Dante transmitter) and two
input (Dante receiver) audio channels
can be assigned to other devices (routed)
using the Dante Controller software appli-
cation. The Dante transmitter and receiver
channels are limited to supporting four
Dante flows, two in each direction. The
digital audio’s bit depth is up to 24 with
a sampling rate of 44.1 or 48 kHz. Two
bi-color LEDs provide an indication of
the Dante connection status.
Audio Quality
The Model 380’s performance is com-
pletely “pro” with capabilities not expected
in something of such diminutive propor-
tions. A low-noise, wide dynamic-range
microphone preamplifier and associated
voltage-controller-amplifier (VCA) dynamics
controller (compressor) ensures that mic
input audio quality is preserved while
minimizing the chance of signal overload.
The output of the microphone preamp
and compressor is routed to an analog-to-
digital conversion (ADC) section that sup-
ports sampling rates of 44.1 and 48 kHz
with a bit depth of up to 24. The audio
signal, now in the digital domain, routes
through the processor and on to the Dante
interface section where it is packetized and
prepared for transport over Ethernet.
Audio input signals arrive via the Dante
receiver channels and pass into the Model
380’s processor. The sampling rate will be
44.1 or 48 kHz with a bit depth of up to 24.
Channel routing, headphone level control,
and sidetone creation are performed within
the digital domain. This provides flexibil-
ity, allows precise control, and keeps the
three level potentiometers (two for audio
inputs and one for sidetone) from having
to directly handle analog audio signals.
The two audio channels destined for
the phones outputs are sent to a high-
performance digital-to-analog converter
and then on to robust driver circuitry. High
signal levels can be provided to a variety
of headsets, headphones, and earpieces.
Configuration Flexibility
Several configuration choices are avail-
able, allowing the Model 380 to meet the
needs of specific applications and user
preferences. Five DIP switches, located
under the belt clip, facilitate selection of
key parameters including microphone
preamplifier gain, audio routing to the
headphone output, talkback button mode,
and sidetone operation. Two of the DIP
switches are used to select the gain of
the microphone preamplifier from among
four choices. This allows the Model 380
to match the output sensitivity of a range
of handheld and headset-associated
microphones. In the dual-channel mode
the two input audio sources will be routed
independently to the left and right head-
phone output channels while sidetone will
be sent to both left and right. In the mono
mode the two input audio sources, along
with sidetone, will be combined and sent
to only the left headphone output chan-
nel. These choices allow support for a
dual-channel (two independent channels
of talent cueing (IFB)) or a single-channel
monaural listening experience.
The pushbutton switch, located on the
Model 380’s top panel, can be configured
to operate in either a momentary or latch-
ing mode. While the functional differences
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are somewhat subtle, the two modes al-
low distinct applications to be supported.
In the momentary mode the button can
provide a combination talkback function.
This would be applicable for on-air sports
applications where the microphone signal
typically remains active. In the latching
mode the button could be considered
as serving as a microphone-on/off con-
trol. This would be useful in applications
where talent requires local control of their
microphone on and off status. The inte-
grated sidetone function can be enabled
or disabled as required. This is important
as different applications may, or may not,
provide “mix-minus” talent cue signals.
In the case where no mix-minus signal is
present, providing a Model 380 user with
sidetone is an important means of con-
firming their local microphone audio.
Ethernet Data and PoE
The Model 380 connects to an Ethernet
data network using a standard 100 Mb/s
twisted-pair Ethernet interface. The physi-
cal interconnection is made by way of a
Neutrik® etherCON RJ45 connector. While
compatible with standard RJ45 plugs,
etherCON allows a ruggedized and lock-
ing interconnection for harsh or high-
reliability environments. An LED displays
the status of the network connection.
The Model 380’s operating power is
provided by way of the Ethernet interface
using the 802.3af Power-over-Ethernet
(PoE) standard. This allows fast and ef-
ficient interconnection with the associated
data network. To support PoE power man-
agement, the Model 380’s PoE interface
reports to the power sourcing equipment
(PSE) that it’s a class 1 (very low power)
device. If a PoE-enabled Ethernet port
can’t be provided by the associated Ether-
net switch a low-cost PoE midspan power
injector can be utilized.
Future Capabilities and
Firmware Updating
The Model 380 was designed so that its
capabilities and performance can be en-
hanced in the future. A USB connector,
located on the unit’s main circuit board
(underneath the unit’s cover), allows the
application firmware (embedded software)
to be updated using a USB flash drive.
The Model 380 uses Audinate’s Ultimo™
integrated circuit to implement the Dante
interface. The firmware in this integrated
circuit can be updated via the Ethernet
connection, helping to ensure that its
capabilities remain up to date.
Getting Started
What’s Included
Included in the shipping carton are a
Model 380 On-Air Beltpack and a printed
copy of this guide. As a device that is
Power-over-Ethernet (PoE) powered,
no external power source is provided.
Should a PoE midspan power injector be
required it must be purchased separately.
Connections
In this section signal interconnections
will be made using the four connectors
located on the bottom of the Model 380’s
enclosure. An Ethernet data connection
with Power-over-Ethernet (PoE) capability
will be made using either a standard RJ45
patch cable or an etherCON protected
RJ45 plug. A microphone will be connected
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Studio Technologies, Inc. Page 9
using a cable-mounted 3-pin male XLR
connector. A set of headphones or an
earpiece will be connected by way of
a ¼-inch 2- or 3-conductor plug. And,
depending on the application, the Model
380’s microphone-level output may be
interfaced with other equipment using
a cable terminated with a standard 3-pin
female XLR connector.
Ethernet Connection with PoE
A 100BASE-TX Ethernet connection that
supports Power-over-Ethernet (PoE) is
required for Model 380 operation. This one
connection will provide both the Ethernet
data interface and power for the Model
380’s circuitry. A 10BASE-T connection is
not sufficient and a 1000BASE-T (“GigE”)
connection is not supported unless it can
automatically “fall back” to 100BASE-TX
operation. The Model 380 supports Ether-
net switch power management, enumerat-
ing itself as a PoE class 1 device.
The Ethernet connection is made by way
of a Neutrik etherCON protected RJ45
connector that is located on the bottom
of the Model 380’s enclosure. This allows
connection by way of a cable-mounted
etherCON connector or a standard RJ45
plug. The Model 380’s Ethernet interface
supports auto MDI/MDI-X so that a “cross-
over” or “reversing” cable will never be
required.
Ethernet Connection without PoE
As previously discussed in this guide,
the Model 380 was designed such that
the Ethernet connection will provide both
data and Power-over-Ethernet (PoE)
power. There may be situations where the
associated Ethernet switch does not pro-
vide PoE power. In such cases an external
PoE midspan power injector can be used.
If the selected midspan power injector is
802.3af-compatible it should function cor-
rectly. Midspan units are available from a
variety of sources, including many online
retailers.
Microphone Input
The Model 380 provides a 3-pin female
XLR connector that allows a balanced
dynamic microphone to be connected.
The microphone can be a stand-alone
handheld (“stick”) type or can be part of a
broadcast-style headset. The Model 380’s
microphone input is directly compatible
with balanced dynamic microphones. A
microphone should be connected such
that pin 1 is common, pin 2 is signal high
(+), and pin 3 is sign low (–).
It’s possible to connect a microphone
that requires P12 or P48 phantom power
for operation. In this case power must be
provided externally by way of a compat-
ible signal connection made to the Model
380’s microphone output connector. It’s
expected that the microphone output
connector would interface with the mi-
crophone input on a broadcast camera,
audio console, microphone mixer, or simi-
lar equipment. Inputs on these devices
would typically offer phantom power and
they should be enabled. Phantom power
present on the Model 380’s microphone
output will “pass through” to the Model
380’s microphone input and then on to the
connected microphone. The Model 380’s
microphone input circuitry will not be dam-
aged by the presence of phantom power.
It will still function properly, offering the
same performance as if a dynamic micro-
phone was connected to the Model 380’s
microphone input.
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Headphone Output
The Model 380 provides a 2-channel head-
phone output by way of a 3-conductor
¼-inch phone jack. Devices such as stereo
headphones or stereo (“dual-muff”) broad-
cast-style headsets can be directly con-
nected using a 3-conductor ¼-inch plug.
Following the usual convention the left
channel should be terminated on the tip
lead, the right channel on the ring lead,
and common on the sleeve lead.
It’s also possible to use a monaural (“single-
muff”) headset or broadcast-type single
earbud but some care must be taken. If
a 3-conductor ¼-inch plug is used by the
device it should be wired to the tip and
sleeve leads; the plug’s ring lead should
be left unconnected. But it’s also very likely
that the monaural device will be terminated
on a 2-conductor (“tip and sleeve”) plug.
When the plug is inserted into the Model
380’s headphone jack the Model 380’s right
headphone output channel will be shorted;
the ring lead will be directly shorted to the
sleeve lead. This can lead to stress on the
right channel headphone output circuitry
as well as extra current draw. To prevent
this condition the headphone output mode
configuration choice (DIP switch 3) should
be set for monaural. This disables the right
headphone output channel and sends the
listen audio sources only to the left output
channel. Refer to the Configuration section
later in this guide for details on setting the
headphone audio routing.
Microphone Output
A 3-pin male XLR connector provides a
microphone-level output that’s directly
related to the microphone input. Techni-
cally the output is identical to the signal
that’s connected to the microphone input
but with a solid-state muting circuit in series
with the interconnection. When the Model
380’s Dante main output channel is active
the microphone signal passes through
to the Model 380’s microphone output.
When the main output channel is muted
(and the Dante talkback channel is ac-
tive) the microphone signal does not pass
through to the microphone output; it’s is
muted in an essentially click-free manner.
Refer to Appendix A, located at the end
of the guide, for a block diagram of the
microphone input and microphone output
circuitry. Studying this diagram can help
illuminate one of the more unique Model
380 features.
The microphone output can be connected
to a balanced (differential) analog micro-
phone-level input on a variety of devices.
When the Model 380 was designed the
primary target devices were portable
ENG-style video cameras that included
microphone inputs. The mic inputs on
these cameras are typically amplified and
then embedded with the video signal into
an SDI output. This would ensure that
“lip sync” would be maintained since the
audio and video would travel on the same
digital stream. The Model 380’s Dante
main output channel would not be used or
would only be used as a backup path. The
microphone output can also be connected
to mic inputs on audio consoles or to con-
sole remote I/O interfaces, e.g., Calrec®
Hydra2®.
No preamplifier or other active circuitry
impacts the path from the Model 380’s
microphone input connector to the Model
380’s microphone output connector. The
signal does pass through a 200 ohm resis-
tor in each “leg” (pin 2 and pin 3) along
with connecting to a solid-state relay
contact. The result is that the source
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