Model 780-03 Central Controller / Model 790 Control Console

Model 780-03 Central Controller / Model 790 Control Console
Model 780-03 Central Controller / Model 790 Control Console
Overview
Creating and distributing eight channel (7.1) surround audio material has become
common for entertainment, cinema, and allied applications. As such, the ability to
simply and effectively monitor these sources is imperative during the recording
and post-production process. Studio Technologies has addressed these needs
with the StudioComm for Surround Model 780-03 Central Controller and the
Model 790 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 resources it’s a simple task to integrate a monitoring system
into virtually any facility. The carefully selected group of features, including
Model 790
Control Console
two surround (7.1) and one stereo input, configurable input-source time delay,
LFE low-pass filter, multiple pre- and post-fader surround outputs, configurable downmix and mute/solo functions, and bass management, along with a
Key Features:
multi-format sync input, make the system powerful yet simple to operate. And
• 7.1 surround and stereo balanced digital
by using the best of contemporary technology, as well as following rigorous
audio inputs
design practices, the system’s audio quality is excellent.
• 7.1 surround balanced digital and
A StudioComm for Surround system starts with the Model 790 Control Console.
7.1 surround analog outputs
It’s the system’s “command center” and is designed to reside at a user’s location, allowing fingertip selection of all monitoring functions. Numerous LEDs
• Balanced digital audio capability
provide complete status information. A 4-digit numeric display indicates the
• Allows use of multiple control consoles
level of the post-fader digital and analog monitor outputs. A major strength of
• Superior audio quality
the Model 790 is its ability to configure, under software control, many important operating parameters. Intended for secondary monitoring locations that
don’t require all of the Model 790’s features, 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.
Most installations will use only one Model 790 Control Console. However, up to three additional Model 790 or Model 71 Control
Consoles can also be connected. This provides multiple users with control over a facility’s monitor system. And to make installation simple, the Model 780-03 provides power for all connected Model 790 or Model 71 units.
The core of this StudioComm for Surround system is the Model 780-03 Central Controller. The one-rack-space unit contains
circuitry that supports balanced digital audio inputs, balanced digital and analog monitor outputs, digital audio and control
processing, and interfacing for the user control surface(s). The Model 780-03 provides two surround (7.1) and one stereo digital
audio inputs. These balanced digital inputs are AES3-compliant; sources of this type are ubiquitous in many post-production and
audio facility environments. The inputs allow a sample rate of 44.1, 48, 88.2 or 96 kHz and a bit depth of up to 24 to be supported.
Circuitry associated with the stereo input provides sample rate conversion (SRC) capability, allowing a wide range of digital audio
sources to be monitored. To compensate with processing delays (latency) associated with associated video displays up to 340
milliseconds of input delay can be selected. For flexibility, two delay values can be configured, allowing real-time selection as
Model 780-03 Central Controller Front Panel
50395-0415, Issue 1
Model 780-03 Central Controller Back Panel
desired. A number of different signals can serve as the Model 780-03’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.
A range of digital and analog surround (7.1) monitor outputs are provided. The post-fader digital and analog monitor outputs
are intended for connection to monitor loudspeaker systems. The pre-fader digital monitor output can be used with metering
systems that require signals that aren’t impacted by level control or other monitoring functions. The digital monitor outputs
are compatible with equipment that requires balanced AES3 digital audio signals with an output impedance of 110 ohms and a
signal level of 5 volts peak-to-peak (Vpp).
A sophisticated bass management function is integral to the Model 780-03’s design and can be enabled if desired. It can apply to
both the post-fader digital and analog monitor output channels. 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 sonic “picture” of the source material from being presented. To overcome this, the low-frequency
energy from the seven channels associated with the surround inputs and the two channels associated with the stereo input can
be separated and routed to the subwoofer (SUB) channel of the monitor outputs. 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 was preserved. All audio processing, including bass management,
is performed in 32-bit logic using a high-speed field-programmable gate array (FPGA) integrated circuit. High-performance integrated circuits are used to perform input, output,
and clocking tasks.
The Model 780-03 occupies one space (1U) in a standard 19-inch rack. Digital audio
sources are interfaced with the Model 780-03 using one 25-pin female D-subminiature
connector and one 3-pin female XLR connector. A BNC connector is used to interface with
an external sync source. Digital and analog monitor output signal connections are made
using two 25-pin female D-subminiature connector. One 9-pin female D-subminiature
Model 71 Control Console
connector is used to connect the Model 780-03 with a maximum of four Model 790 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 780-03, with an acceptable range of 100 to 240 V, 50/60 Hz.
Additional Details
The Model 790 provides three buttons and associated LEDs for selection of the source to be monitored. The choices are the two
surround inputs and the stereo input; only one source can be monitored at a time. It’s interesting to note that while the surround
inputs have an LFE channel associated with them, the corresponding post-fader digital and analog monitor output channels are
designated as subwoofer (SUB), rather than LFE. This terminology was 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 channels, combine it with the contents from the LFE input channel, and route the combination to the subwoofer (SUB)
channels of the post-fader digital and analog monitor outputs.
An LFE low-pass filter function is provided as a means of checking the audio content in the LFE channel of a selected surround
input. The user can enable and disable the function as required, helping to ensure that the proper signals are being mixed to the
LFE channel. Having the correct audio content in the LFE channel can be critical as the LFE channel is typically band-restricted
during distribution.
Studio Technologies, Inc.
StudioComm 780-03/790, Issue 1, Page 2
The post-fader 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 digital
and analog monitor output channels to automatically mute whenever the output level control reaches maximum attenuation.
Using the reference level function, the post-fader digital and analog 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 user confirmation, the 4-digit LED display
will show the level of the post-fader digital and analog monitor output channels. To match the needs of a facility, the display can
be configured to show either the attenuation level or the sound pressure level (SPL).
The dim function allows the post-fader digital and analog 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 digital and analog monitor output
channels to be simultaneously muted. The input mute/solo section allows an input channel to be muted or monitored as desired.
Multiple channels can also be simultaneously selected for muting or “soloing.”
Two output mute functions are also provided. One button allows the seven main channels of the post-fader digital and analog
monitor outputs to be muted. A second button allows the subwoofer (SUB) channels of the post-fader digital and analog monitor
outputs to be muted. The output mute functions, along with the input mute/solo function, allow a user complete flexibility when
checking an input source and its path to the loudspeaker system(s). These mute and solo resources are crucial in a multichannel
environment, especially when signals are passing through the bass management function.
Three downmix functions allow the selected input source to be checked for compatibility with common audio channel formats.
This can help ensure that surround and stereo mixes correctly “fold down” into formats that utilize less channels than the
original. Errors can be quickly identified and then corrected. The downmix functions, To 5.1 and To Stereo, apply only to the
two surround (7.1) sources. The To Mono downmix function applies to the surround and stereo inputs. Several of the downmix
parameters can be configured to best meet the needs of an application. The downmix functions always impact the post-fader
digital and analog monitor outputs. A configuration setting allows the pre-fader digital monitor output to be selected for pre- or
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 digital and analog monitor outputs.
Studio Technologies, Inc.
StudioComm 780-03/790, Issue 1, Page 3
Specifications
Model 780-03 Central Controller
General Audio:
Supported Sample Rates: 44.1, 48, 88.2, and 96 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)
Downmix Functions: To 5.1, To Stereo, and To Mono
Digital Audio Inputs: 3 (18 audio channels total)
Configuration: two surround (7.1) and one stereo
Type: balanced AES3 (110 ohms, 5 Vpp)
Connector—Surround Inputs: 25-pin female D-subminiature (DB-25F),
AES59-2012-compliant
Connector—Stereo Input: 3-pin female XLR
Remote Control Inputs: 2
Functions: remote mute all, remote dim
Type: 3.3 Vdc logic, activates on closure to system common
Connector: 9-pin female D-subminiature (DE-9F)
Sample Rate Conversion (SRC):
Application: available on the stereo input
Input Sample Rate Range: 8 to 216 kHz, limited to 1/6 to 6 times the
output sample rate
Latency: 1 millisecond, nominal
LFE Input Channel Low-Pass Filter: –6 dB @ 120 Hz, 48 dB-per-octave,
on/off selectable
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 channels (8 pairs)
Configuration: organized as two surround (7.1), one pre-fader, and one
post-fader
Dynamic Range: >135 dB
Type: balanced AES3 (110 ohms, 5 Vpp)
Connector: 25-pin female D-subminiature (DB-25F), AES59-2012compliant
Analog Monitor Outputs: 8
Configuration: organized as one surround (7.1), post-fader
Type: electronically balanced, source impedance 200 ohms
Nominal Level: +4 dBu @ –20 dBFS input source and level control
at maximum setting
Maximum Level: +24 dBu into 2000 (2 k) ohms or greater
Frequency Response, Digital Inputs to Analog Monitor Outputs:
10 Hz-20 kHz +0.0/–0.3 dB @ 48 kHz sample rate; –3 dB @ 64 kHz
Distortion (THD+N): <0.002%, –1 dBFS, 20-22 kHz, 22 kHz bandwidth
S/N Ratio: 89 dB, ref +4 dBu output
Dynamic Range: >109 dB
Crosstalk: –98 dB at 1 kHz; –97 dB at 16 kHz, ref –1 dBFS input
Connector: 25-pin female D-subminiature (DB-25F), AES59-2012compliant
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 (7.1) channel
independently adjustable in 0.5-dB steps over a ±12-dB range. (Digital
and analog outputs associated with a specific channel share the same
setting.)
Bass Management:
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 dB-per-octave or 24 dB-per-octave
Overall Operation: on/off selectable
Studio Technologies, Inc.
Control Console Interface:
Type: RS-485, 115.2 kbit/s, 8-1-N
Polling Interval: 80 milliseconds, nominal
Power: 12 Vdc, 500 mA maximum
Connector: 9-pin female D-subminiature (DE-9F)
AC Mains:
Requirement: 100 to 240 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: 3.6 pounds (1.6 kg)
Model 790 Control Console
Application: up to four Model 790 Control Consoles can be connected
to a Model 780-03 Central Controller
Power: 12 Vdc nominal (9 Vdc minimum), maximum current 100 mA,
provided by Model 780-03 Central Controller
Control Data:
Type: RS-485
Data Rate/Format: 115.2 kbit/s, 8-N-1
Connector: 9-pin female D-subminiature (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 780-03 Central Controller
Power: 12 Vdc nominal (9 Vdc minimum), maximum current 35 mA,
provided by Model 780-03 Central Controller
Control Data:
Type: RS-485
Data Rate/Format: 115.2 kbit/s, 8-N-1
Connector: 9-pin female D-subminiature (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., April 2015
www.studio-tech.com
StudioComm 780-03/790, Issue 1, Page 4
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