Issue 3, December 2022
Model 5422A User Guide
Page 30
Studio Technologies, Inc.
Model 5422A
DANTE INTERCOM AUDIO ENGINE
IFB (1 Int-in)
This operating mode is provided so that a broadcast-type talent cue (IFB or interrupted foldback) signal can be
created from two Dante audio sources. One source serves as the interrupt signal while the second source is
considered to be program. The Model 5422A implements IFB (1 Int-in) such that both program with interrupt and
program only channels are created. The action of IFB (1 Int-in) is controlled using the audio signal that arrives
in the Dante receiver (input) audio channel specified for interrupt. This audio source can be either voice-only
or voice-with-high-frequency audio. A voice-only interrupt signal would use the Model 5422A’s voice-operated
(VOX) detection resources. The tone-operated (TOX) method detects the presence of an “in-band” high-frequency
tone (typically an 18 or 20 kHz sine-wave signal) which is used to trigger or “key” the IFB (1 Int-in) function. No
external IFB activation data or hardware signal is required.
Each IFB (1 Int-in) section uses two Dante receiver
(input) channels and two Dante transmitter (output)
channels. One Dante receiver (input) channel is des-
ignated for use by the interrupt audio source while the
other receiver channel is designated as the program
audio source. One Dante transmitter (output) channel
is designated as the program with interrupt (“interrupt”)
channel and the other as the non-interrupt (“pro
-
gram” or “program only”) channel. The number of IFB
(1 Int-in) sections provided by a Model 5422A group
depends on the selected group size. A group size of 4
would provide two independent IFB (1 Int-in) sections.
A group size of 32 would provide 16 independent IFB
(1 Int-in) sections.
The audio signal connected to the Dante receiver
(input) channel that is designated for interrupt serves
two purposes. The first purpose is that it is monitored
to determine if it is active. An active interrupt input can
be configured to be detected as either the presence
of audio within the voice band (VOX) or the presence
of high-frequency content (TOX). When the interrupt
input is detected as on (active) the interrupt audio
source is automatically routed to the program with
interrupt Dante output channel. If TOX is selected as
the interrupt detection method the interrupt audio is
first sent through a low-pass-filter function before it
is routed to the program with interrupt output. (This
removes the high-frequency interrupt “trigger” content
