Studio Technologies Annoucer's Console 233 Manual de usuario
Copyright © 2014 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
User Guide
Issue 5, November 2014
This User Guide is applicable for serial numbers:
M233-01151 and later
50336-1114, Issue 5
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Model 233 User Guide Issue 5, November 2014
Studio Technologies, Inc. Page 3
Table of Contents
Introduction ................................................................... 5
System Features ........................................................... 6
Installation and Setup ................................................... 12
Configuration ................................................................ 17
Operation ...................................................................... 29
Advanced Operation ..................................................... 34
Technical Notes ............................................................. 35
Specifications ................................................................ 44
Appendix A .................................................................... 45
Block Diagram
Issue 5, November 2014 Model 233 User Guide
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Model 233 User Guide Issue 5, November 2014
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Introduction
What This User Guide Covers
This User Guide is designed to assist you
when installing, configuring, and using
the Model 233 Announcer’s Consoles with
serial numbers of 01151 and later. Addi-
tional background technical information is
also provided. A product block diagram is
included at the end of this guide.
System Overview
The Model 233 Announcer’s Console is
designed to serve as the audio control
“hub” for announcers, commentators, and
production personnel. The tabletop unit is
suited for numerous applications including
on-air television and radio broadcasting.
The Model 233 will also perform an out-
standing role in stadium announce appli-
cations. The Model 233 is compatible with
essentially all broadcast and production
audio system environments. Standard con-
nectors are used to interface microphone,
headphone, on-air, talkback, line input, and
intercom signals.
Whether it’s the mic preamplifier, audio
switching, talkback signals, intercom inter-
facing, or headphone cue feed, superior
audio quality is maintained throughout. A
microprocessor provides the Model 233’s
logic power, allowing precise control of
the unit’s operation. With extensive flexibil-
ity built in, creating the desired operating
configuration is a simple matter. While the
operating features of the unit can be care-
fully tailored, the user is presented with an
easy-to-use set of controls and indicators.
A wide range of resources, great perfor-
mance, and simplicity during use—these
are the hallmarks of the Model 233.
The Model 233 is a truly “next-generation
and then some” product. Exhaustive
research into the needs and desires of
field production personnel was integral to
its creation. Providing a veritable “tool kit”
of features, the unit supports a wide variety
of applications that include on-air television
and radio broadcasting, stadium announce-
ment, and simultaneous interpretation. In
addition, with the unit’s broad range
Figure 1. Model 233 front panel
Issue 5, November 2014 Model 233 User Guide
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of capabilities many other specialized
“behind-the-scenes” applications can
also be implemented.
System Features
Microphone Input
A high-performance microphone preampli-
fier circuit provides low-noise/low-distortion
amplification over a 20 to 60 dB gain range.
The gain is adjustable in 10 dB steps. The
input is compatible with balanced dynamic
and condenser microphones. The micro-
phone power source is 48 volts nominal
and meets the worldwide P48 phantom
power standard. An LED indicator serves as
an aid for optimizing the preamplifier’s gain
setting. The output of the microphone pre-
amplifier is used by the main output as well
as being routed to the compressor circuit
that supports the talkback functions.
Main Output
The Model 233 provides a main output that
is designed to serve as the on-air, stadium
announcement, or other primary audio
feed. Nominally –2 dBu, it is designed as a
fully professional interface with high output
capability, low distortion, and low noise.
The output circuitry features a high-perfor-
mance output transformer expressly de-
signed for professional audio applications.
Talkback Functions
The talkback functions are intended to pro-
vide personnel associated with production
trucks, control rooms, live-performance,
and sports venues with talent-originated
cue signals. The Model 233 contains
two pushbutton switches that control the
talkback functions. Associated with each
pushbutton switch is a dedicated line-level
talkback output. Each pushbutton switch
can also be configured to send audio
to one specific channel associated with
the Model 233’s dual-channel intercom
interface.
The line-level talkback outputs are trans-
former-coupled with a +4 dBu nominal
signal level. They contain resistors in series
with the output connectors, allowing line-
level talkback outputs from multiple units
to be directly “summed.”
For non-on-air applications, a special
Model 233 feature set can be enabled by
placing the unit in its “production” mode.
This software-based mode allows the main
output to be used as an additional talkback
Figure 2. Model 233 back panel
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Studio Technologies, Inc. Page 7
output. This feature makes the unit even
more powerful when used in live-event
applications, such as serving as a master
console for an orchestra conductor or
production director.
With all the available talkback flexibility,
the exact needs of many specific applica-
tions can easily be met. And, of course,
whatever configuration is implemented,
the audio quality will be excellent.
Dynamic Range Control
To enhance the Model 233’s talkback func-
tions, a studio-quality compressor circuit
is provided to control the dynamic range
of the signal coming from the microphone
preamplifier. Far from a simple “clipper,”
the circuit utilizes a sophisticated laser-
trimmed voltage-controlled-amplifier (VCA)
integrated circuit for quiet, low-distortion
level control.
The signal from the compressor is always
used by the talkback functions. For flex-
ibility, the audio source for the main output
can be selected to be either the direct
output of the microphone preamplifier or
the output of the compressor. For on-air
applications the signal coming directly
from the microphone preamp would be
correct. But having dynamic range control
of the signal going to the main output can
offer increased performance for selected
applications. These could include stadium
announcement locations, award show
conductor positions, and use with non-
professional announcers during sports
events.
User Controls and Status
Indicators
Three pushbutton switches, four LED
indicators, and three rotary controls
provide users with a clear, easy-to-use
interface. One pushbutton switch controls
the status of the main output. This is the
audio output intended for on-air, stadium
announcement, or other primary uses.
Two LEDs display the on/off status of the
main output. Two additional pushbutton
switches control the status of the talkback
functions. These are the audio cue signals
used to communicate with producers,
directors, “spotters,” or other behind-the-
scenes production personnel. A status
LED is associated with each talkback
button. Three rotary controls allow the
user to adjust the level of the headphone
output. Two of the controls are associated
with externally connected cue signals. The
third control is associated with the Model
233’s sidetone function, allowing the user
to monitor the signal associated with the
unit’s microphone input.
Flexibility
A large part of the Model 233’s unique
power is the ability to configure the op-
eration of the main output and talkback
functions. To meet the needs of the many
specific broadcast and production ap-
plications, a variety of button operating
modes is available. The main output
button can be selected to operate from
among four modes. In the “push-to-mute”
mode the button performs a momen-
tary mute of the main output. In this way
a “cough” button function is created,
something typically required for television
sports broadcasting. In the “push-to-talk”
mode the button provides a momentary
active function for the main output. This
mode would be appropriate for applica-
tions such as stadium announcement. An
alternate action “latching” configuration
allows the button to enable or disable the
main output as desired. This is useful in
radio broadcasting, announce-booth, or
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voice-over applications. The fourth mode
provides a hybrid function, supporting
both push-to-talk and tap-to-enable/tap-to-
disable operation. This operation is similar
to that found in many broadcast intercom
system user stations.
The two buttons associated with the talk-
back functions can be configured to oper-
ate from either of two modes. One of the
modes supports a “push-to-talk” function.
This is typically used for on-air broadcast
applications. The other mode provides a
hybrid function, the operation of which is
discussed in the previous paragraph. The
hybrid mode is especially useful when the
Model 233 is used in a production-support
application.
The main button mode configures how the
main output, when it is in the “latched” on
state, responds to talkback activity. One
choice momentarily turns off the main
output when talkback is active, returning
the main output to the on state when the
talkback function has ended. The other
choice “unlatches” the main output in
response to a talkback function.
Cue Sources
The Model 233 supports the connection
of up to four external audio sources, each
of which can be selected for routing to the
stereo headphone output. The sources
are line input 1, line input 2, intercom
channel 1, and intercom channel 2. Each
source can be individually assigned to the
left channel, the right channel, or both the
left and right channels. This allows a wide
variety of stereo and mono headphone
mixes to be created.
For application flexibility, two line-level
audio sources can be connected to
the Model 233. Possible signal sources
include off-air receivers, wireless IFB
systems, and audio consoles. The con-
nected signals can be from two indepen-
dent sources, or could be from a stereo
audio feed such as would be associated
with a broadcast music event. Two level
trim potentiometers, located on the bottom
of the unit, allow signals with wide nominal
audio levels to be cleanly interfaced.
Audio signals associated with a single-
or dual-channel intercom system can
be routed to the headphone output. The
Model 233’s intercom interface is com-
patible with standard party-line intercom
systems from manufacturers such as
RTS™ and Clear-Com®. A broadcast-type
IFB (interrupted foldback) circuit can also
be connected to the intercom input. This
“listen only” signal is often found in televi-
sion broadcast applications.
Sidetone
The Model 233 includes an integrated
sidetone function that allows the output
of the compressor circuit associated with
the microphone preamplifier to be routed
to the stereo headphone output. This pro-
vides a confidence signal to the user, al-
lowing them to hear exactly what is being
sent to the main and, if desired, talkback
outputs. This sidetone signal can be a
critical element when creating an effective
communications environment.
In on-air television and radio broadcast
settings the Model 233 user’s own micro-
phone audio signal is typically returned
to the headphone output by way of a cue
audio source. But there are cases where
this signal is not available, such as when
“mix minus” cue feeds are utilized. This
type of cue feed includes everything but
the user audio, a requirement when sig-
nificant time delays, typically associated
with satellite transmission systems, are
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Studio Technologies, Inc. Page 9
present. In effect the Model 233’s sidetone
function adds the “minus” part to a “mix
minus” cue.
Several configurable parameters allow
the sidetone function to be tailored to the
needs of a specific Model 233 installation.
The sidetone function can be configured
to route audio to the left, right, or left and
right headphone outputs. It can also be
completely disabled. Sidetone can also
be configured to be active only when
the main output is active, or to be active
anytime the main output or either of the
talkback outputs is active.
Headphone Output
Three rotary controls are provided for
user adjustment of the headphone output.
Two of the controls adjust the levels of the
externally connected sources. The third
control is used to set the level of the side-
tone function.
For flexibility the actual functioning of the
two controls associated with the external
sources is configurable. For traditional
on-air sports applications they can be
selected to the dual level control mode
which provides independent control of
the left and right channel volume. For use
with stereo cue signals, or to support user
preference, the level/balance mode can be
selected. In this mode one control adjusts
the overall level of both the left and right
channels, while the other allows adjust-
ment of the left/right level balance. To help
minimize the chance of broadcast cues
being missed, both level control modes
can be configured so that a minimum
headphone output level is maintained.
Alternately, the headphone output can be
set to fully mute when these controls are
at their minimum position.
A headphone control reverse mode is
provided specifically for on-air television
applications where a headset with boom
microphone is used. The reverse mode
ensures that no matter which headset
orientation is used by the talent, the two
“pots” controlling the external sources will
always work intuitively. This will result in a
comfortable work environment, allowing
the “left” control to impact the level to the
talent’s left ear while the “right” control
impacts the right.
The sidetone level control is dedicated to
adjusting the level of the mic audio signal
that’s routed to the headphone outputs.
Configuration switches allow which of the
headphone outputs—left, right, or both—
will receive the sidetone signal. When the
sidetone level control is set to its minimum
position the sidetone level is always set to
be fully muted.
Provision has been made to support ap-
plications where a monaural cue feed is
desired. A configuration switch allows the
summing (combining) of the selected left
and right headphone sources. In addition
to creating a dual-channel mono output it
also allows the level controls to be config-
ured as a simple 3-channel mixer.
The headphone output is optimized to
meet the needs of contemporary head-
phones and headsets. Specifically, the
output circuits act as voltage, rather than
power, drivers. In this configuration they
can provide high output levels with very
low distortion and noise, along with mini-
mal current consumption. The output cir-
cuits are configured to safely drive stereo
or mono loads. This ensures that all types
of headphones, headsets, and earpieces
can be directly connected.
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Intercom Interface
Of special note is the Model 233’s sophis-
ticated intercom interface. It’s designed
to work correctly with industry-standard
single- and dual-channel party-line intercom
systems, including those from RTS and
Clear-Com. An intercom line connected to
the Model 233 can serve three functions:
providing cue audio signals to the head-
phone output, allowing talkback audio to
be sent to intercom users, and acting as
a Model 233 power source. Audio signals
present on the single- or dual-channel
intercom line can be flexibly routed to the
stereo headphone output. Talkback audio,
controlled by the two talkback pushbutton
switches, can be sent to either or both of
the intercom channels. Trim potentiometers,
located on the bottom of the unit, allow
adjustment of the talkback-to-intercom
sidetone (null) level.
The ability to listen to one or both pins of
a connected intercom circuit will only be
available when the intercom interface circuit
detects DC voltage on pin 2. This feature
minimizes the chance that objectionable
audio content (i.e., “howls” or “squeals”)
will be routed to the headphone output
when an intercom circuit is not connected.
Audio Quality and Protection
The Model 233’s circuitry is carefully tailored
to provide excellent audio performance.
Professional-quality components are fea-
tured throughout. For reliability all audio
routing is performed using solid-state
devices under microcontroller direction.
In all critical audio paths, “clickless” elec-
tronic switches provide noise-free control.
All audio inputs and outputs make extensive
use of protection components. This limits
the chance of damage from ESD and other
undesirable, yet real-world, hazards.
Power Sources
The Model 233 can derive its operating
power from an intercom line or an external
24 volt DC source. For redundancy, both
power sources can be connected simul-
taneously. An internal switch-mode power
supply ensures that all Model 233 features
are available, including phantom power,
when the unit is powered by either source.
Auxiliary Relay
Model 233 resources include a general-
purpose relay, allowing specialized configu-
rations to be created. Under software con-
trol, the relay can be configured to follow
the state of the main output, talkback 1, or
talkback 2 buttons. Taking advantage of the
back-panel locations provided for additional
XLR connectors, a technician may easily
create functions such as an “on-air” indica-
tor or implement loudspeaker muting dur-
ing talkback function. Special configuration
modes are even included to allow direct
control of the relay using the talkback 1 or
talkback 2 buttons without impacting any
of the Model 233’s audio signals.
Tally Output
Another unique Model 233 feature is the
tally output. It provides an indication, in
the form of a current-limited DC signal, of
the status of the main output. Whenever
the main output is active the tally output
is active. This 3.5 volt nominal, 12 milliam-
peres maximum, signal is capable of direct-
ly lighting an LED indicator or triggering an
external control system. The tally output
is provided specifically for specialized ap-
plications such as television award show
broadcasts where remote monitoring and
control of the main output is required.
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