User Guide

Issue Preliminary 1, August 2021 Model 354 User Guide
Page 16 Studio Technologies, Inc.
Model 354
TALK STATION
high-frequency sine-wave audio tones that are added
to the Dante transmitter (output) channels. The pres-
ence of these tones can be selected such that the
status of a Model 354 channel can be communicated
to a connected device. These status signals allow the
unit to be integrated into a range of local and remote
applications. Used in conjunction with the Studio
Technologies’ Model 5422A Dante Intercom Audio
Engine, it would be simple to create REMI or At-Home
functions. Most digital audio processor units can be
programmed to respond to the audio tones.
None: In this mode no tones will be added to the
associated Dante transmitter (output) channel.
18 kHz Tone when Preamble or Mic Active: In this
mode an 18 kHz sine wave tone will be sent out the
associated Dante transmitter (output) channel when
-
ever preamble or microphone audio is active. The
sine-wave tone will be mixed (combined or summed)
with the preamble and/or microphone audio. This
function can be useful by providing an “on-air” trig-
ger for functions associated with devices such as the
Model 5422A Dante Intercom Audio Engine.
20 kHz Tone when Preamble or Mic Active: Similar
to the previous mode, this mode provides a 20 kHz
sine wave tone, combined with the preamble or mi
-
crophone audio, on the associated Dante transmitter
(output) channel.
20 kHz when Inactive, 18 kHz when Preamble or
Mic Active: In this mode whenever the associated
preamble or microphone audio is inactive then a 20
kHz tone will be sent out the associated Dante trans
-
mitter (output) channel. No tone will be sent when
the preamble and/or microphone audio is active. This
serves as a channel “keep alive” signal, indicating
that the audio path is actively functioning but that no
user audio is present. The way in which this oper-
ates harks back to the days of 4-wire telephone truck
circuits. An “idle” trunk would have a continuous tone
present to alert personnel that a circuit was “live” and
ready to function. When the trunk became active the
tone would be removed and voice audio would be
connected.
20 kHz when Receiver Channel Active, None when
Preamble or Mic Active: If a high-frequency tone
is present on the Dante receiver (input) channel
then the Model 354 considers this to be a receiver
channel active condition. If the receiver channel is
active and preamble or microphone audio is not active
then a 20 kHz tone is sent out the Dante transmitter
(output) channel. If, whether or not a tone is present
on the Dante receiver (input) channel, preamble or
microphone audio is active then no tone will be sent
out the Dante transmitter (output) channel. This choice
will allow a more sophisticated “keep alive” signal to
be generated, one that indicates when an associated
receiver channel is active.
16 kHz when Receiver Channel Inactive, 20 kHz
when Receiver Channel Active, 18 kHz when
Preamble or Mic Active: This mode provides three
different tones that represent the status of both the
associated Dante transmitter (output) channel and
the Dante receiver (input) channel. When the Dante
receiver (input) channel associated with the unit’s
specific channel doesn’t have a high-frequency
tone present the Model 354 considers this to be a
receiver channel inactive condition. In this case, a
16 kHz wave tone is sent out the associated Dante
transmitter (output) channel. If a high-frequency tone
is present on the Dante receiver (input) channel then
the Model 354 considers this to be a receiver channel
active condition. If the receiver channel is active and
preamble or microphone audio is not active then a
20 kHz tone is sent out the Dante transmitter (output)
channel. If the receiver channel is active and preamble
or microphone audio is active then an 18 kHz tone is
sent out the Dante transmitter (output) channel. The
tones always combine (mix or sum) with any other
audio signal that’s present on the Dante transmitter
(output) channel. After some study it’s hoped that it
will become clear as to why this set of tone signals
would allow an audio process device to recognize
the operating status of a Model 354’s receiver and
transmitter channel.
Operation
Pending.
Technical Notes
IP Address Assignment
By default, the Model 354’s Dante-associated Eth-
ernet interface will attempt to automatically obtain
an IP address and associated settings using DHCP
(Dynamic Host Configuration Protocol). If a DHCP
server is not detected an IP address will automatically