Model 760-02 Central Controller / Model 77 Control Console Overview

Model 760-02 Central Controller / Model 77 Control Console Overview
Model 760-02 Central Controller / Model 77 Control Console
Overview
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 760-02 Central Controller and the Model 77 and
Model 71 Control Consoles. With digital audio inputs, 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, which includes surround and
stereo inputs and output, configurable input-signal time delay, configurable
downmix and mute/solo functions, and bass management, along with a multiformat sync input, make the system 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.
Model 77 Control Console
Key Features:
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 a user’s location,
allowing fingertip selection of all monitoring functions. Numerous LED indicators provide complete status information. A 4-digit numeric display indicates the
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.
• 5.1 surround and stereo balanced digital
audio inputs
5.1 surround and stereo analog outputs
• Balanced digital audio capability
• Allows use of multiple control consoles
• Superior audio quality
Most installations will use only one Model 77 Control Console. However, 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 760-02 provides power for all connected Model 77 or Model 71 units.
The core of this StudioComm for Surround system is the Model 760-02 Central Controller. The one-rack-space unit contains circuitry
that supports balanced digital audio inputs, balanced analog monitor outputs, digital processing of audio and control signals, and
interfacing for the user control surface(s). The Model 760-02 provides two surround (5.1) and three 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 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 760-02’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 760-02 Central Controller Front Panel
50250-0115, Issue 1
Model 760-02 Central Controller Back Panel
A surround (5.1) and a stereo analog monitor output are provided. They are intended for connection to monitor loudspeaker systems.
Electrically balanced, the monitor output signals provide low-noise, low-distortion, and high-headroom performance.
A sophisticated bass management function is integral to the Model 760-02’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 low-frequency energy from the five channels associated with the surround inputs and the two channels associated with the
stereo inputs can be separated and routed to the subwoofer (SUB) channel of the monitor output. 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-bit logic using a high-speed field-programmable gate array
(FPGA) integrated circuit.
The Model 760-02 occupies one space (1U) in a standard 19-inch rack. Digital audio sources
are interfaced with the Model 760-02 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. Analog monitor output signal connections are made using a 25-pin female
D-subminiature connector. One 9-pin female D-subminiature connector is used to connect
the Model 760-02 with a maximum of 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 760-02, with an acceptable range of 100 to 240
V, 50/60 Hz.
Additional Details
Model 71 Control Console
The Model 77 provides five buttons and associated 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” channel of the
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, combining it with the LFE content before routing the sum to the subwoofer
output.
The level of the surround and stereo monitor output channels 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 monitor
outputs to automatically mute whenever the output level control reaches maximum attenuation. Using the reference level function,
the 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 a 4-digit LED readout can display the level of the active monitor output. 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 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 monitor output to be fully muted. The channel mute/solo section provides
individual channel monitoring control, allowing a single channel to be muted or monitored. Multiple channels can also be simultaneously selected for muting or “soloing.”
Studio Technologies, Inc.
StudioComm 760-02/77, Issue 1, Page 2
A special solo mode is also provided, called channel pop solo, which offers a unique aid when monitoring audio material. Channel pop solo allows the level of a single 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 input 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.
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 surround and stereo monitor outputs.
Specifications
Model 760-02 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: 5 (18 audio channels)
Configuration: two surround (5.1) and three stereo
Type: balanced AES3 (110 ohms, 5 Vpp)
Connector—Surround Inputs and Stereo Inputs A & B: 25-pin female
D-subminiature (DB-25F), AES59-2012-compliant
Connector—Stereo Input C: 3-pin female XLR
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
Studio Technologies, Inc.
Analog Monitor Outputs: 8
Configuration: organized as one surround (5.1) and one stereo
(2-channel)
Type: electronically balanced, source impedance 200 ohms
Nominal Level: +4.0 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): 0.004%, ref 1 kHz, +4 dBu output
S/N Ratio: 89 dB, ref +4 dBu output
Dynamic Range: greater than 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), AES59-2012-compliant
Configurable Input Delay: 0 to 340 milliseconds @ 48 kHz sample rate
(scales up or down depending on actual sample rate)
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-per-octave or 24 dB-per-octave
Overall Operation: independent on/off selectable for surround
and stereo monitor outputs
StudioComm 760-02/77, Issue 1, Page 3
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 dB 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 Vdc, 500 mA maximum
Connector: 9-pin female D-subminiature (DE-9F)
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)
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 77 Control Console
Application: up to four Model 77 Control Consoles can be connected
to a Model 760-02 Central Controller
Power: 12 Vdc nominal (9 Vdc minimum), maximum current 100 mA,
provided by Model 760-02 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 760-02 Central Controller
Power: 12 Vdc nominal (9 Vdc minimum), maximum current 35 mA,
provided by Model 760-02 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., January 2015
www.studio-tech.com
Studio Technologies, Inc.
StudioComm 760-02/77, Issue 1, Page 4
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