Model 76DB Central Controller / Model 77B Control Console

Model 76DB Central Controller / Model 77B Control Console
Model 76DB Central Controller / Model 77B Control Console
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 an “all-digital” world now upon us, additional monitoring challenges have
arisen. Studio Technologies has addressed these needs with the StudioComm
for Surround Model 76DB Central Controller and the Model 77B and Model 71
Control Consoles. With the digital audio inputs and outputs, Dolby® E dialnorm support, and extensive set of user resources it’s a simple task to integrate
a monitoring system into virtually any facility. The carefully selected group of
features, including flexible input source selection, multiple outputs, dialnorm
display, channel downmix, and multiple-format sync input, make the system
Model 77B Control Console
powerful yet simple to operate. And by using the best of contemporary technology, as well as following rigorous design practices, the system’s audio quality
is excellent. Its unique feature set makes it especially well suited to meet the
Key Features:
unique needs of broadcast master control applications.
• Dolby® E metadata dialnorm support
Model 77B and Model 71 Control Consoles
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Flexible input source selection
An all-digital StudioComm for Surround system starts with the Model 77B
Unbalanced digital inputs
Control Console. It’s the system’s “command center” and is designed to reside
Supports multiple control consoles
at an operator’s location, allowing fingertip selection of all monitoring funcExcellent audio quality
tions. Numerous LED indicators provide complete status information. A 4-digit
Channel pop solo function
numeric display indicates the monitor output or dialnorm level in real time.
A major strength of the Model 77B is its ability to configure, under software
control, many important operating parameters. The Model 71 Control Console is a compact user control surface that is intended
for secondary monitoring locations. 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 77B Control Console, up to three additional Model 77B 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 76DB provides power for all connected Model 77B or Model 71 units.
Model 76DB Central Controller
The heart of this StudioComm system is the Model 76DB Central Controller. The one-rack-space unit contains audio input, output,
processing, and support circuitry. The Model 76DB provides two surround (5.1) and three stereo audio inputs. These unbalanced
digital inputs are AES3id/SMPTE 276M-compliant. Sources of this type are ubiquitous in most post-production and broadcast
environments. A sample rate of up to 192 kHz with a bit depth of up to 24 are directly supported. Circuitry associated with one
Model 76DB Central Controller Front Panel
50233-1213, Issue 2
Model 76DB Central Controller Back Panel
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
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.
Two surround (5.1) and two stereo monitor outputs are provided. The post-fader surround monitor output is intended for connection
to a monitor loudspeaker system. 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 auxiliary stereo monitor output is provided for special
broadcast applications where an independent output with separate on/off control is desired. The stereo input C direct monitor
output allows an installation to directly access the SRC capabilities.
For installation flexibility the 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 source of Dolby E metadata can be connected to the Model 76DB Central Controller. This RS-485/RS-422 115.2 kbit/s serial data
signal carries numerous data elements, including one that represents the average dialog level of an associated audio program. This
dialog normalization or “dialnorm” value is an integral part of many broadcast distribution systems, ending up as part of consumer
audio playback systems. Hardware and software within the Model 76DB separates the dialnorm element that relates to one of the
connected surround audio sources. This dialnorm level value can be displayed on the Model 77B Control Console, as well as being
used to automatically adjust the post-fader surround monitor output level. This provides a unique solution for the broadcast and
post-production world, allowing a professional environment to accurately simulate an end user’s experience.
Great care was taken when designing the system’s architecture, ensuring that the character
of the audio input signals is preserved. All audio processing is performed in 32-bit words
using a high-speed field-programmable gate array (FPGA) integrated circuit.
The Model 76DB occupies one space (1U) in a standard 19-inch rack. Digital audio signals
are interfaced with the Model 76DB’s inputs using nine BNC connectors. A tenth BNC connector is used by the sync source. Monitor output signal connections are made using one
25-pin D-subminiature connector. One 9-pin D-subminiature connector is used to connect
the Model 76DB with up to four Model 77B or Model 71 Control Consoles. A second 9-pin
“D-sub” connector is used to interface Dolby E dialnorm data and remote control signals
with the Model 76DB. AC mains power is connected directly to the Model 76DB, with an
acceptable range of 100 to 230 volts, 50/60 Hz.
Model 71 Control Console
Additional Details
The Model 77B provides four buttons and associated LEDs for selecting the input source to be monitored. The buttons are designed
such that up to six unique input choices are available. Using the Model 77B’s configuration mode, each of the six input choices
can be configured from the system’s two surround (5.1) and three stereo inputs. The configuration mode also allows stereo inputs
A and B to be used as either stereo or monaural sources. This is especially useful in broadcast applications where a 2-channel
AES3id source may carry two independent monaural signals. To highlight this powerful feature: the Model 77B allows independent
monitoring of the two channels associated with a single AES3id source. Broadcast master control applications can greatly benefit
from this configuration flexibility.
The post-fader surround monitor output level 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 monitor
output channels to automatically mute whenever the output level control reaches maximum attenuation. Using the reference level
Studio Technologies, Inc.
StudioComm 76DB/77B, Issue 2, Page 2
function, the post-fader surround monitor output level 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
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 monitor output level 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 monitor output channels to be simultaneously muted. The channel solo section provides post-fader surround channel monitoring control, allowing a single channel to be
monitored while the others are automatically muted. Multiple channels can also be simultaneously selected for “soloing.”
A special solo mode is also provided, called channel pop solo, which offers aunique aid in monitoring audio material. Channel pop
solo allows the level of a single channel to be raised while the level of the other channel 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 5.1 to stereo downmix function is
used to create a stereo signal from the selected surround (5.1) source. 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 monitor outputs. A configuration setting allows the pre-fader surround monitor outputs to be selected for
pre- or post-downmix operation.
In addition to the surround (5.1) monitor output, a auxiliary stereo monitor output is also provided. A stereo signal, connected to
stereo input C on the Model 76DB Central Controller, can be routed to the auxiliary output. A pushbutton on the Model 77B Control
Console allows on/off control of the signal; no level control or signal modification takes place. The auxiliary output feature can be
useful in special applications, e.g., in a broadcast control room setting where an audio signal, such as site-event cue signals, needs
to be monitored by way of an independent set of loudspeakers.
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, or audio consoles. Three remote-control inputs provide access to the mute all, dim, and
auxiliary output on/off 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 monitor output or enable the auxiliary output.
Studio Technologies, Inc.
StudioComm 76DB/77B, Issue 2, Page 3
Specifications
Model 76DB 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
Dynamic Range: >135 dB
Input-to-Output Latency: one sample (e.g., 0.021 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: four (16 audio channels)
Configuration: organized as two surround (5.1), one auxiliary stereo,
and one stereo input C direct output
Type: AES3 (110 ohms/5 Vpp) or AES3id/SMPTE 276M
(75 ohms/1 Vpp), selectable
Connector: 25-pin D-subminiature female (DB-25F)
Configurable Delay: 0 to 340 milliseconds @ 48 kHz sample rate
(scaled up or down depending on actual sample rate)
Downmix:
Functions: 5.1 to stereo, stereo to mono
5.1 to Stereo: LS @ –3 dB summed with L;
RS @ –3 dB summed with R;
C @ –6 dB summed with L and R;
LFE @ –6 dB summed with L and R (if enabled);
C, LFE, LS, and RS monitor outputs mute
Stereo to Mono: L @ –3 dB summed with R @ –3 dB to C;
L, R, LS, RS, and LFE monitor outputs mute (for a surround input
this results in the C output being the sum of L @ –3 dB, R @ –3 dB,
C @ –3 dB, LFE @ –3 dB (if enabled), LS @ –6 dB, and RS @ –6 dB)
Dolby E Metadata Input:
Type: RS-485/RS-422
Data Rate/Format: 115.2 kbit/s, 8-N-1
Connector: 9-pin D-subminiature female (DE-9F), shared with remote
control inputs
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: three
Functions: remote mute all, remote dim, remote auxiliary stereo
monitor output on/off
Type: +5 V logic, activates on closure to system common
Connector: 9-pin D-subminiature female (DE-9F), shared with metadata
input
AC Mains:
Requirement: 100 to 230 V, 50/60 Hz, 15 watts 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 77B Control Console
Application: up to four Model 77B Control Consoles can be connected
to a Model 76DB Central Controller
Power: 12 volts DC nominal (9 volts DC minimum), maximum current
100 milliamperes, provided by Model 76DB 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 76DB Central Controller
Power: 12 volts DC nominal (9 volts DC minimum), maximum current
35 milliamperes, provided by Model 76DB 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., December 2013
www.studio-tech.com
Studio Technologies, Inc.
StudioComm 76DB/77B, Issue 2, Page 4
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