StudioComm 76DA Bedienungsanleitung
50241-1016, Issue 10
© 2016 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
Model 76DA Central Controller and
Model 77 Control Console
User Guide
Issue 10, October 2016
This User Guide is applicable for systems consisting of:
Model 76DA: serial number M76DA-01151 and later
with software version 4.20 and higher and FPGA version 4.12 and higher;
Model 77: serial number M77-00151 and later with software version 4.20 and higher
for Surround
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Model 76DA/77 User Guide Issue 10, October 2016
Studio Technologies, Inc. Page 3
for Surround
Table of Contents
Introduction ................................................................... 5
Installation .................................................................... 9
Configuration ................................................................17
Operation ......................................................................39
Technical Notes ............................................................46
Specifications ...............................................................50
Appendix A—Connection Pin-Out Charts ....................52
Appendix B—Sync Input Sources ................................53
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Model 76DA/77 User Guide Issue 10, October 2016
Studio Technologies, Inc. Page 5
for Surround
Introduction
What This User Guide Covers
This User Guide is designed to assist
you when installing and using the Model
76DA Central Controller and one or more
associated Model 77 or Model 71 Control
Consoles.
Overview
As creating and distributing multi-channel
surround (5.1) and stereo audio mate-
rial has become a day-to-day reality, the
ability to simply and effectively monitor
these sources is imperative for recording,
post-production, and broadcast facilities.
And with audio-with-picture applications
becoming so prevalent, additional monitor-
ing challenges have arisen. Studio Tech-
nologies has addressed these needs with
the StudioComm for Surround Model 76DA
Central Controller and the Model 77 and
Model 71 Control Consoles. With digital
audio inputs, digital and analog monitor
outputs, support for multiple user control
surfaces, and an extensive set of operating
resources it’s a simple task to integrate a
monitoring system into virtually any facility.
The carefully selected group of features,
including surround and stereo inputs, con-
figurable input-signal time delay, multiple
pre- and post-fader outputs, configurable
downmix and mute/solo functions, and bass
management, along with a multi-format
sync input, make the system powerful yet
simple to operate. And by using the best of
contemporary technology, as well as follow-
ing rigorous design practices, the system’s
audio quality is excellent.
A StudioComm for Surround system starts
with the Model 77 Control Console. It’s the
system’s “command center” and is designed
to reside at an operator’s location, allow-
ing fingertip selection of all monitoring
functions. Numerous LED indicators pro-
vide complete status information. A 4-digit
numeric display indicates the post-fader
monitor output level in real time. A major
strength of the Model 77 is its ability to
configure, under software control, many
important operating parameters. Intended
for secondary monitoring locations, the
Model 71 Control Console is a compact
user control surface. It provides three of
the most basic functions: a rotary level
control, dim on/off button, and reference
level on/off button.
While many installations will use only one
Model 77 Control Console, up to three
additional Model 77 or Model 71 Control
Consoles can also be connected. This
provides multiple users with full control
over a facility’s monitor system. And to
make installation simple, the Model 76DA
provides power for all connected Model 77
or Model 71 units.
The core of this StudioComm for Surround
system is the Model 76DA Central Con-
troller. The one-rack-space unit contains
circuitry that supports digital audio inputs,
digital and analog monitor outputs, pro-
cessing, and the user interface. The Model
76DA provides two surround (5.1) and
three stereo digital audio inputs. These
unbalanced digital inputs are AES3/
SMPTE 276M-compliant; sources of this
type are ubiquitous in most post-produc-
tion and broadcast environments. The in-
puts allow a sample rate of up to 192 kHz
and a bit depth of up to 24 to be directly
supported. Circuitry associated with one
of the stereo inputs provides sample rate
conversion (SRC) capability, allowing a
wide range of digital audio sources to be
monitored. Up to 340 milliseconds of input
Issue 10, October 2016 Model 76DA/77 User Guide
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Figure 1. Model 76DA Central Controller Front Panel
Figure 2. Model 76DA Central Controller Back Panel
Sync status
LED
Control console
status LED
www.studio-tech.com
www.studio-tech.com
SYNC
CONTROL
CONSOLE
Central Controller
STATUS
CONTROL CONSOLE:
LIT FOR DATA ACTIVITY;
FLASHES FOR OVER-CURRENT
SYNC:
LIT FOR LOCK;
FLASHES FOR NOT LOCKED
STATUS LEDS
MODEL 76D CENTRAL CONTROLLER
Model 76D
Sync
Input
Surround Input B
Surround Input A
Stereo Input A and
Stereo Input B
Stereo
Input C
delay can be selected to compensate for
processing delays in an associated video
path. For flexibility, two delay values can be
configured, allowing real-time selection as
desired. A number of different signals can
serve as the Model 76DA’s digital audio
timing reference. For synchronization with
a master timing reference a dedicated
source of word clock, DARS (AES11), bi-
level video, or tri-level video can be connect-
ed. Alternately, the L/R connection of the
actively selected surround or stereo input
source can serve as the timing reference.
A range of digital and analog surround (5.1)
and stereo digital monitor outputs are pro-
vided. The post-fader surround and stereo
digital and analog monitor outputs are in-
tended for connection to monitor loudspeak-
er systems. The pre-fader surround digital
monitor output can be used with metering
systems that require signals that aren’t
impacted by level control or other monitor-
ing functions. The stereo input C direct
digital monitor output allows an installation
to directly access the SRC capabilities.
For installation flexibility the digital monitor
outputs can be configured for compatibil-
ity with equipment that requires balanced
or unbalanced AES3 digital audio signals.
When selected for balanced AES3 compat-
ibility the output impedance is 110 ohms
with a signal level of 5 volts peak-to-peak
(Vpp). For unbalanced AES3 operation
the impedance is 75 ohms and the level
is 1 Vpp.
A sophisticated bass management func-
tion is integral to the Model 76DA’s design
and can be enabled if desired. It can apply
to both the surround and stereo digital and
analog post-fader monitor output channels.
Note however that the bass management
function is only supported at sample rates
of 44.1, 48, 88.2, and 96 kHz. The overall
goal of bass management is very simple:
ensure that the entire audio bandwidth of
all channels can be accurately monitored.
Many loudspeaker systems have inherent
low-frequency limitations, preventing a true
picture of the source material from being
presented. To overcome this, the low-
Digital monitor
outputs
To/from
Models 77 & 71
Control Consoles
AC mains
input
Remote control inputs
Analog monitor
outputs
Model 76DA/77 User Guide Issue 10, October 2016
Studio Technologies, Inc. Page 7
for Surround
Figure 3. Model 77 Control Console Front Panel
Channel mute/solo
Mute/solo
mode
Post-fader surround
monitor output
• Surround/stereo
• Reference level
• Mute all
• Dim
• Rotary level control
Monitor output
level display
Input source
select
Downmix
frequency energy from the five surround
and two stereo channels can be separated
and then routed to the subwoofer loud-
speaker. Several of the bass management
functions can be configured to match the
requirements of specific installations.
Great care was taken in designing the
system’s architecture, ensuring that the
character of the audio input signals is pre-
served. All audio processing, including bass
management, is performed in 32 bits using
a high-speed field-programmable gate array
(FPGA) integrated circuit.
The Model 76DA occupies one space (1U)
in a standard 19-inch rack. Digital audio
sources are interfaced with the Model 76DA
using nine BNC connectors. A tenth BNC
connector is used by the sync source.
Digital and analog monitor output signal
connections are made using two 25-pin
female D-subminiature connectors. One
9-pin female D-subminiature connector is
used to connect the Model 76DA with up
to four Model 77 or Model 71 Control Con-
soles. A second 9-pin female “D-sub” con-
nector is used to interface with
remote control signals. AC mains power
is connected directly to the Model 76DA,
with an acceptable range of 100 to 230
volts, 50/60 Hz.
Additional Details
The Model 77 provides five buttons and as-
sociated LEDs for selection of the surround
and stereo input sources to be monitored.
While in most cases only one input source
will be monitored at a time, stereo input C
can be selected for simultaneous monitoring
with one of the two surround or other two
stereo inputs. This allows the two selected
inputs to be combined (“summed”).
It’s interesting to note that while each of the
two surround inputs has an LFE channel
associated with it, the “.1” post-fader digital
and analog surround monitor outputs are
designated as SUB (subwoofer), rather than
LFE. This terminology was carefully selected
to highlight the fact that this output channel
may include more than just LFE content.
The bass management function, if enabled,
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for Surround
will redirect low-frequency energy from the
main input channels, combing it with the
LFE content before routing the sum to the
digital and analog subwoofer outputs.
The post-fader surround and stereo digital
and analog monitor output levels can be
controlled by way of a large, easy-to-use
rotary control. The control, actually a digital
encoder, allows level selection in precise
0.5-dB steps. The auto mute all function
causes the post-fader surround and stereo
monitor output channels to automatically
mute whenever the output level control
reaches maximum attenuation. Using the
reference level function, the post-fader
surround and stereo monitor output levels
can be set to a pre-configured value. This is
provided for audio-with-picture applications
that require a specific monitor output level.
The reference level is easily configured
by taking an electronic “snapshot” of the
desired monitor output level. For opera-
tor confirmation a 4-digit LED readout can
display the level of the post-fader sur-
round and stereo monitor output channels.
To match the needs of a facility, it can be
configured to display either the attenuation
level or the sound pressure level (SPL).
The dim function allows the post-fader
surround and stereo digital and analog
monitor output levels to be reduced by a
fixed dB amount. The dim level is config-
ured from among four available values. A
mute all function allows the post-fader sur-
round and stereo monitor output channels
to be simultaneously muted. The channel
mute/solo section provides post-fader sur-
round and stereo channel monitoring con-
trol, allowing a single channel to be muted
or monitored. Multiple channels can also
be simultaneously selected for muting or
“soloing.”
A special solo mode is also provided,
called channel pop solo, which offers a
unique aid in monitoring audio material.
Channel pop solo allows the level of a
single post-fader digital and analog moni-
tor output channel to be raised while the
level of the other channels is reduced. This
helps to emphasize the content on one
channel without fully muting the others.
Broadcast applications can benefit from
the channel pop solo mode by allowing, for
example, the center channel to be high-
lighted while still maintaining some level on
the other channels. The amount of level in-
crease—the “pop”—as well as the amount
of attenuation can be configured to meet
the needs of specific applications or users.
Two functions allow the input sources to
be checked for level or phase inconsis-
tencies. The surround to stereo downmix
function is used to create a stereo signal
from the selected surround (5.1) source.
Key operating parameters in the surround
to stereo downmix function can be config-
ured to meet the requirements of an appli-
cation. This can be especially useful when
support for specific international broadcast
standards is required. The stereo to mono
downmix function allows audio on the left
and right channels to be added (summed)
and monitored on the center output chan-
nel. The two downmix functions can be
simultaneously enabled, allowing a sur-
round source to be checked for mono com-
patibility. The downmix functions always
impact the post-fader surround and stereo
monitor outputs. A configuration setting
allows the pre-fader surround monitor out-
put to be selected for pre- or post-downmix
operation.
For flexibility, the StudioComm for Sur-
round system is designed to easily inte-
grate with equipment such as production
Model 76DA/77 User Guide Issue 10, October 2016
Studio Technologies, Inc. Page 9
for Surround
intercom systems, on-air or recording tally
signals, and audio consoles. Two remote-
control inputs provide access to the mute
all and dim functions. By providing access
to these functions, talkback or slate activity
from an audio console or other communi-
cations system can control the level of the
post-fader surround and stereo monitor
outputs.
Installation
In this section you will be installing the
Model 76DA Central Controller in an equip-
ment rack. Connections to the digital audio
inputs, digital monitor outputs, and analog
monitor outputs will be made. A dedicated
digital audio timing reference signal can
be connected to the sync input. If desired,
external equipment will be interfaced to
the remote control inputs. A location will
be selected for the first Model 77 Control
Console and it will be connected to the
Model 76DA. AC mains power will be con-
nected to the Model 76DA. For advanced
applications up to three additional Model
77 or Model 71 Control Console units can
be connected to the Model 76DA.
System Components
The main shipping carton contains one
each of the following: Model 76DA Central
Controller, Model 77 Control Console,
9-pin D-sub interconnecting cable, and
user guide. Also included in the ship-
ping carton is a North-American-standard
AC mains cord. Your dealer or distributor
should provide an AC mains cord appropri-
ate for destinations outside of North
America. Any additional Model 77 or
Model 71 Control Consoles will be
shipped in separate cartons.
Mounting the Model 76DA
The Model 76DA Central Controller re-
quires one space (1U) in a standard 19-
inch (48.3 cm) equipment rack. Secure
the Model 76DA into the equipment rack
using two mounting screws per side. Se-
lect a location that is convenient for making
connections to the audio signals as well
as interfacing with the first (or only) Model
77 Control Console. A cable is supplied
to connect the Model 76DA to the Model
77. If the needs of a specific installation
dictate, an alternate-length interconnecting
cable can be fabricated and used.
Audio Connections
Audio connections are made by way of
nine BNC jacks and two 25-pin female
D-subminiature connector. All the connec-
tors are located on the Model 76DA’s back
panel. Refer to Figure 2 for a detailed view
of these jacks and the connector.
Audio Inputs
Two surround (5.1) and three stereo digital
audio sources can be connected. All sourc-
es can be monitored using the pre- and
post-fader surround and post-fader stereo
monitor output channels. A one-to-one
relationship is maintained between the
input and output channels, i.e., left input
to left monitor output, right input to right
monitor output, center input to center
monitor output, etc. (Of course this won’t
be true in the case where the user has
enabled one or both of the downmix func-
tions.) Stereo input C is also routed to the
stereo input C direct monitor output.
The audio inputs support digital audio sig-
nals with a sampling rate of up to 192 kHz
and a word length (depth) of up to 24 bits.
It’s best if the connected signal sources
Issue 10, October 2016 Model 76DA/77 User Guide
Page 10 Studio Technologies, Inc.
for Surround
maintain a common sample rate and tim-
ing reference. Having all signals “locked”
together helps to ensure proper handling
by the Model 76DA’s all-digital signal
control path.
There is, however, an exception worth
noting. Circuitry associated with stereo
input C has sample rate conversion (SRC)
capability, allowing virtually any digital
audio signal to be connected. A signal
connected to stereo input C can have an
independent sample rate and timing refer-
ence and still be monitored correctly. Refer
to the Technical Notes section of this guide
for a detailed review of the SRC capability.
Nine BNC jacks on the Model 76DA’s
back panel are used to interface with the
18 channels associated with the digital
audio signal sources; each BNC connector
carries two audio channels. The digital
audio inputs are intended for connection
with unbalanced digital audio sources that
are compatible with the AES3 standard. In
broadcast or post-production environments
these signals may also be referred to as
following the SMPTE 276M standard. This
signal type has a nominal impedance of 75
ohms with a nominal signal level of 1 Vpp.
As expected, these digital audio sources
should be provided in the form of coaxial
cables with BNC plugs attached.
Balanced AES3 digital audio signals
can also be used with the Model 76DA’s
inputs if external coupling transformers
(“baluns”) are utilized. These impedance-
matching (110 ohms to 75 ohms) and
level-attenuating transformer assemblies
typically provide a 3-pin female XLR con-
nector on their input and a female BNC
connector on their output.
Digital Monitor Outputs
The 25-pin female D-subminiature con-
nector labeled Digital Monitor Outputs
provides access to the Model 76DA’s 16
channels of digital audio monitor output:
pre-fader surround, post-fader surround,
post-fader stereo, and stereo input C
direct. The pre-fader surround digital
monitor output channels are intended
for connection to metering or monitoring
equipment that requires uninterrupted full-
level signals.
The post-fader surround digital monitor
output channels are intended to connect to
a 5.1 loudspeaker system. The post-fader
stereo digital monitor output is provided to
support a separate set of stereo monitor
loudspeakers.
The stereo input C direct digital monitor
output is essentially a unity gain copy of
the signal connected to stereo input C.
However, the signal does pass through the
sample rate conversion (SRC) and input
delay circuitry. The impact made by these
functions will depend on the specific input
signal and the Model 76DA’s configuration
settings.
For flexibility the digital monitor outputs
are transformer-coupled and can be con-
figured to act as balanced or unbalanced
AES3 digital audio sources. The digital
monitor outputs are configured in two
groups with separate choices available
for the pre-fader surround/stereo input C
direct group and post-fader surround/post-
fader stereo group. When a group is set for
balanced AES3 operation the signals have
a nominal impedance of 110 ohms and a
nominal level of 5 Vpp. Signals of this type
are normally interconnected using shielded
twisted-pair cable terminated with 3-pin
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