Studio Technologies Dante 5422A, Руководство пользователя

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Model 5422A User Guide Issue 3, December 2022
Studio Technologies, Inc. Page 33
Model 5422A
DANTE INTERCOM AUDIO ENGINE
can be provided by a Model 5422A depends on the
selected group size. A group size of 4 channels would
provide one IFB (3 Int-in) section. A group size of 32
channels would provide 8 independent IFB (3 Int-in)
sections.
Each audio signal that is connected to a Dante receiver
(input) channel that is designated for interrupt is used
for two purposes. The first purpose is that it is moni -
tored to determine if it is active. As a group, the three
interrupt inputs can be configured to be detected as
active by either the presence of audio within the voice
band (VOX) or the presence of high-frequency content
in the audio channel (TOX). When an interrupt input
is detected as on (active) that specific interrupt audio
source automatically routes to the program with inter-
rupt output channel. If TOX is selected as the interrupt
detection method, each interrupt audio signal is sent
through a low-pass-filter function before it is routed
to the program with interrupt output channel. This
removes the high-frequency interrupt “trigger” content,
preventing it from being sent to a user. Whenever an
interrupt input is not detected as being on (considered
to be in the off state) that specific interrupt audio source
is not routed to any output. If more than one input is
detected as being on (active) the interrupt audio sig-
nals are combined (summed) and then routed to the
program with interrupt output channel. In this way, one,
two, or all three interrupt input audio sources can be
utilized as IFB interrupt sources.
The program audio input source that is routed (Dante
subscribed) to the designated Dante receiver (input)
channel is always routed to the Dante transmitter
(output) program audio channel. This signal doesn’t
change and provides the IFB (3 Int-in) function’s
non-interrupt (“program” or “program only”) audio
channel. When all three of the interrupt audio sources
are detected as not being active (interrupt off state) the
program audio input signal is also routed, at full level,
to the Dante transmitter (output) program with interrupt
channel. When one, two, or all three of the interrupt
audio sources are detected as being active (on) the
level of the program audio source as it is routed to the
program with interrupt channel will be impacted by
the configured IFB Dim value. This can range from 0
dB (no level change) to a full mute (fully attenuated).
Between those extremes dim (attenuation) values of
10, 15, and 20 dB are available.
IFB Parameters
The three IFB parameters apply to both the IFB (1 Int-
in) and IFB (3 Int-in) operating modes. These settings
apply to all IFB sections that are established within a
specific audio engine. For example, the Model 5422A-
01 would have one set of settings for the IFB Detection
Mode, Dim Level, and VOX Minimum On Time. These
would apply to that unit’s one 32-channel audio engine.
In the Model 5422A-02, there would be two sets of
settings, one set for each 32-channel audio engine.
Detection Mode
Choices are:
Voice-Operated (VOX), Tone-Operated
(TOX) .
This choice selects whether interrupt activity will be
detected using the voice-operated (VOX) function or
the tone-operated (TOX) function, both of which are
implemented in the digital domain within the Model
5422A’s logic circuitry. When selected for VOX, inter -
rupt activity is detected when voice-band audio is pres-
ent within the interrupt audio source. Specifically, audio
content from approximately 225 to 1250 Hz at a level of
–44 dBFS or greater would be detected as being active.
When selected for TOX, interrupt activity is present
when high-frequency audio content is detected in the
interrupt audio channel. Essentially any sine-wave
or square-wave signal with a frequency in the range
of 15 to 22 kHz and a signal level of approximately
–22 dBFS or greater can serve as the control signal.
(See the Specifications section for the exact VOX and
TOX performance parameters.)
There are a number of different ways that a TOX-
compatible high-frequency audio signal can be created.
Several Studio Technologies’ products will generate
an 18 or 20 kHz sine-wave that is part of a Dante
transmitter (output) audio signal. For example, each
button on the Model 348 Intercom Station can be
independently configured to cause an 18 or 20 kHz
tone to be generated. The Model 544D Audio Interface
allows a contract closure to generate a 20 kHz tone
that’s part of a Dante transmitter (output) channel. It’s
also expected that Studio Technologies will offer a
simple product that will allow contract closures (GPI
signals) to cause high-frequency sine-wave tones to
be generated on Dante transmitter (output) channels.
In this way, legacy products that offer contact closure
(or even logic signals) can be used to control one or
more Model 5422A Audio Switching sections.