Model 76D Central Controller / Model 77 Control

Model 76D Central Controller / Model 77 Control
Model 76D Central Controller / Model 77 Control
As creating and distributing multi-channel surround (5.1) and stereo audio material
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 monitoring challenges have arisen. Studio Technologies has addressed these needs with
the StudioComm for Surround Model 76D Central Controller and the Model 77
and Model 71 Control Consoles. With digital audio inputs, digital 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, configurable input-signal time delay, multiple pre- and post-fader
Model 77 Control Console
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 following
Key Features:
rigorous design practices, the system’s audio quality is excellent.
• Digital audio inputs
Model 77 Control Console
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Digital audio outputs
Bass management capability
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
Configurable downmix
location, allowing fingertip selection of all monitoring functions. Numerous
Channel mute/solo
LED indicators provide complete status information. A 4-digit numeric display
Level adjustment, reference level, and dim
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 76D provides power for all connected Model 77 or Model 71 units.
Model 76D Central Controller
The core of this StudioComm for Surround system is the Model 76D Central Controller. The one-rack-space unit contains circuitry
that supports digital audio inputs, digital monitor outputs, processing, and the user interface. The Model 76D provides two surround
(5.1) and three stereo digital audio inputs. These unbalanced digital inputs are AES3id/SMPTE 276M-compliant; sources of this
type are ubiquitous in most post-production and broadcast environments. The inputs 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 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 76D’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 connected.
Alternately, the L/R connection of the actively selected surround or stereo input source can serve as the timing reference.
Model 76D Central Controller Front Panel
50231-0613, Issue 3
Model 76D Central Controller Back Panel
A range of surround (5.1) and stereo digital monitor outputs are provided. The post-fader surround and stereo monitor outputs
are intended for connection to monitor loudspeaker systems. The pre-fader surround monitor output can be used with metering
systems that require signals that aren’t impacted by level control or other monitoring functions. The stereo input C direct monitor
output allows an installation to directly access the SRC capabilities.
For installation flexibility the monitor outputs can be configured for compatibility with equipment that requires AES3 (“balanced”)
or AES3id (“unbalanced”) digital audio signals. When selected for AES3 compatibility the output impedance is 110 ohms with a
signal level of 5 volts peak-to-peak (Vpp). For AES3id operation the impedance is 75 ohms and the level is 1 Vpp.
A sophisticated bass management function is integral to the Model 76D’s design and can be enabled if desired. 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 lowfrequency energy from the five surround and two stereo channels can be separated and then routed to the subwoofer loudspeaker.
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 preserved. All
audio processing, including bass management, is performed in 32 bits using a high-speed field-programmable gate array (FPGA)
integrated circuit.
The Model 76D occupies one space (1U) in a standard 19-inch rack. Digital audio sources
are interfaced with the Model 76D using nine BNC connectors. A tenth BNC connector is
used by the sync source. Digital monitor output signal connections are made using a 25pin D-subminiature connector. One 9-pin D-subminiature connector is used to connect the
Model 76D with up to four Model 77 or Model 71 Control Consoles. A second 9-pin “D-sub”
connector is used to interface with remote control signals. AC mains power is connected
directly to the Model 76D, with an acceptable range of 100 to 230 volts, 50/60 Hz.
Additional Details
The Model 77 provides five buttons and associated LEDs for selection of the surround and
Model 71 Control Console
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 surround
monitor output is 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, will redirect low-frequency
energy from the main input channels, combing it with the LFE content before routing the sum to the subwoofer output.
The post-fader surround and stereo 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 operator confirmation a 4-digit LED readout can display
the level of the post-fader surround 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).
Studio Technologies, Inc.
StudioComm 76D/77, Issue 3, Page 2
The dim function allows the post-fader surround and stereo monitor output levels to be reduced by a fixed dB amount. The dim
level is configured from among four available values. A mute all function allows the post-fader surround and stereo monitor output
channels to be simultaneously muted. The channel mute/solo section provides post-fader surround and stereo channel monitoring
control, 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 monitor 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 highlighted while still maintaining some level on the
other channels. The amount of level increase—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 inconsistencies. 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 configured to meet the requirements of an application. 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 channel. The two downmix functions can be simultaneously
enabled, allowing a surround source to be checked for mono compatibility. The downmix functions always impact the post-fader
surround and stereo monitor outputs. A configuration setting allows the pre-fader surround monitor output to be selected for preor post-downmix operation.
For flexibility, the StudioComm for Surround system is designed to easily integrate with equipment such as production 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 communications system
can control the level of the post-fader surround and stereo monitor outputs.
Studio Technologies, Inc.
StudioComm 76D/77, Issue 3, Page 3
Specifications
Model 76D Central Controller
General Audio:
Supported Sample Rates: 32, 44.1, 48, 88.2, 96, 176.4, and 192 kHz
Word Length: 24 bits maximum
Internal Processing: 32 bits
Input-to-Output Latency: two samples (e.g., 0.042 milliseconds @
48 kHz sample rate)
Digital Audio Inputs: five (18 audio channels)
Configuration: two surround (5.1) and three stereo
Type: AES3id-2001/SMPTE 276M (unbalanced 75 ohms/1 Vpp)
Connectors: BNC (per IEC 60169-8 Amendment 2)
Sample Rate Conversion (SRC):
Application: available on Stereo Input C
Input Sample Rate Range: 8 to 216 kHz, limited to 1/6 to 6 times the
output sample rate
Latency: 1 millisecond, nominal
Sync Source: configured to follow L/R of currently selected input or
signal connected to sync input
Sync Input:
Compatible Sources: word clock, DARS (AES11), bi-level video,
tri-level video
Jitter: 4 ns pp maximum
Connector: BNC (per IEC 60169-8 Amendment 2)
Termination: 75 ohms, selectable on/off
Digital Monitor Outputs: 16 (eight pairs)
Configuration: organized as two surround (5.1) and two stereo
Dynamic Range: >135 dB
Type: AES3 (110 ohms/5 Vpp) or AES3id/SMPTE 276M (75 ohms/
1 Vpp), selectable
Connector: 25-pin D-subminiature female (DB-25F)
Configurable Input Delay: 0 to 340 milliseconds @ 48 kHz sample rate
(scales up or down depending on actual sample rate)
Post-Fader Monitor Output Level Offsets: each surround and stereo
channel independently adjustable in 0.5-dB steps over a ±12-dB range
Bass Management:
Supported Sample Rates: 44.1, 48, 88.2, and 96 kHz only
Crossover Frequency and Type: –6 dB @ 40, 50, 60, or 80 Hz,
symmetrical for low-pass and high-pass filters, maximally flat
Filter Slope: 12 or 24 dB/octave
Overall Operation: independent on/off selectable for surround and
stereo post-fader monitor outputs
Downmix:
Functions: surround to stereo, stereo to mono
Surround to Stereo:
L @ 0 or –3 dB;
R @ 0 or –3 dB;
C @ –3 or –6 dB summed with L and R;
LFE @ full attenuation or –6 dB summed with L and R;
LS @ –3 or –6 dB summed with L;
RS @ –3 or –6 summed with R;
C, SUB, LS, and RS monitor outputs mute
Stereo to Mono:
L @ –3 dB summed with R @ –3 dB to C;
L, R, LS, RS, and SUB monitor outputs mute
For a surround input this results in the C output being the sum
of L @ –3 or –6 dB, R @ –3 or –6 dB; C @ –3 or –6 dB, LFE @ full
attenuation or –6 dB; LS @ –6 or –9 dB, and RS @ –6 or –9 dB
Control Console Interface:
Type: RS-485, 115.2 kbit/s, 8-1-N
Polling Interval: 50 milliseconds
Power: 12 volts DC, 500 milliamperes maximum
Connector: 9-pin D-subminiature female (DE-9F)
Remote Control Inputs: 2
Functions: remote mute all, remote dim
Type: +5 V logic, activates on closure to system common
Connector: 9-pin D-subminiature female (DE-9F)
AC Mains:
Requirement: 100 to 230 V, +10/–15%, 50/60 Hz, 15 W maximum
Connector: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
Dimensions:
19.00 inches wide (48.3 cm)
1.72 inches high (4.4 cm)
7.00 inches deep (17.8 cm)
Mounting: one space (1U) in a standard 19-inch rack
Weight: 6.2 pounds (2.8 kg)
Model 77 Control Console
Application: up to four Model 77 Control Consoles can be connected
to a Model 76D Central Controller
Power: 12 volts DC nominal (9 volts DC minimum), maximum current
100 milliamperes, provided by Model 76D Central Controller
Control Data:
Type: RS-485
Data Rate/Format: 115.2 kbit/s, 8-N-1
Connector: 9-pin D-subminiature female (DE-9F)
Dimensions (Overall):
7.20 inches wide (18.3 cm)
2.20 inches high (5.6 cm)
5.40 inches deep (13.7 cm)
Weight: 1.7 pounds (0.8 kg)
Model 71 Control Console
Application: up to three Model 71 Control Consoles can be connected
to a Model 76D Central Controller
Power: 12 volts DC nominal (9 volts DC minimum), maximum current
35 milliamperes, provided by Model 76D Central Controller
Control Data:
Type: RS-485
Data Rate/Format: 115.2 kbit/s, 8-N-1
Connector: 9-pin D-subminiature female (DE-9F)
Dimensions (Overall):
3.20 inches wide (8.1 cm)
2.20 inches high (5.6 cm)
4.10 inches deep (10.4 cm)
Weight: 0.8 pounds (0.4 kg)
Specifications and information contained in this Data Sheet subject to
change without notice.
Studio Technologies, Inc.
Skokie, Illinois USA
© by Studio Technologies, Inc., June 2013
www.studio-tech.com
Studio Technologies, Inc.
StudioComm 76D/77, Issue 3, Page 4
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