User`s guide

3: Operation • 7
©2014 Axia Audio - Rev.1.3.8
Chapter Three:
Operation
Each intercom station is a standalone device without
dependence on a central master unit. Each key can be
used for talking to another location, listening to a source,
or establishing a bi-directional communication. Some
models have more features than others. Some models
provide more exible allowance of channels. This chap-
ter should help you understand how the intercom is in-
tended to operate. The next chapter will guide you in
conguration of the intercom station.
Key Controls
The buttons are used to trigger Talk, Listen, or a
Talk/Listen state with sources assigned to the keys.
The buttons can be used in a “tap-and-latch” mode or
a “push-to-talk” (PTT) mode. “Tap-and-latch” feature
works by tapping the button to latch the function ON
until the button is tapped again, releasing the latch. This
mode is useful in allowing the operator’s hands to be
free during the duration of a conversation. The mode can
be disabled if it is desired to only use the “push-to-talk”
mode. The PTT mode requires the operator to maintain
the button press for the duration of a Talk or Listen.
Talk
The user will press either a dedicated Talk button or
the programmable button to engage a talk session to the
source assigned to the key. If the intercom station is con-
gured with a lower trigger value than the station being
called, the receiving station is required to acknowledge
the call. Talk can be used to call another intercom sta-
tion, interact with another device through GPIO, or in-
troduce the stations audio through system route changes.
Details on these can be found in the case examples later
in this chapter.
Listen
The dedicated button on OLED models or the pro-
grammable button congured for “listen” only behave
similar to the Talk button, but for receiving audio from
the assigned source. This function can be used to moni-
tor external sources such as the Off Air feed, the Pro-
gram 1 mix from a main control room, the audio feed
from a TV set, or any other source within the network
that needs to be heard.
Talk/Listen
A Talk/Listen state applies mostly to the program-
mable button as it is a single button assigned to a key.
The Talk/Listen state is the bidirectional communica-
tion that takes advantage of the AEC (Advanced Echo
Cancellation) technology available from the intercom
station. The programmable button, by default, is set to
Talk and Listen when pressed.
LED feedback
The buttons have associated LED that illuminate
to indicate a mode is active. The Talk button on OLED
models has a red LED that is illuminated when the mi-
crophone is active. In addition, if the station assigned to
a key is “listening”, the red LED would be illuminated
to indicate the condition. The dedicated Listen button
has a yellow LED. If another station calls, the associated
Listen LED (yellow) illuminates during the duration of
the call. Once the call is complete, the LED will blink
for the dened duration. The default time is 5 seconds
and is adjusted per station.
The programmable buttons use different color LEDs
to indicate the active state of the key.
Red indicates Talk
Green indicates Listen
Yellow indicates Talk/Listen
The LED indicators will also blink based on a par-
ticular trigger level relation between stations. If one sta-
tion has a lower trigger value than another, the key for
the assigned higher stations will blink. This blink indi-
cation demonstrates that the other station is required to
acknowledge the call prior to the audio being sent. Once
a call is accepted, the calling station is allotted a 5 min-
ute window where any additional calls will be allowed
without acknowledgement. This feature is known as the
trigger level.