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April 2021 PAC45L Pilot Guide
associated RCV switch. The selected audio is indicated by both knob posi-
tion and the green nomenclature text.
You will always hear the audio from the selected transceiver, even if the
selected comm audio is turned all the way down on the audio controller
because it cannot turn the selected receive audio all the way off.
The volume of the received source is adjusted by rotating the knob. PS En-
gineering recommends a lower volume
at the radio and higher audio panel
setting
to minimize noise.
Receiver Activity Indication (
-
RXI)
PAC45L systems have a Receive Activity Indicator that flashes the
selected
receiver indicator when a signal is present on that receiver. This allows the
user to spot an active radio, even if the volume is turned down. This func-
tion is set at the factory at the installer
’
s request, and can be
changed at the factory.
MultiTalker® Head Related Transfer Function
(HRTF)
Communication receiver audio signals are presented to the
DSP and processed to
“
appear
”
in a different location to the
crew.
“
MultiTalker
”
(US Patent #7,391,877) specifies up to
nine locations. This helps the crew to better comprehend
speech by locating it in a manner more easily differentiated
by the human brain.
Intercom and other audio is not spatially processed, only the three commu-
nications transceivers.
You must use stereo headsets, in stereo mode for this feature
.
MultiTalker® places the communications receiver audio in one of nine ap-
parent locations in the crew
’
s headset. This has been scientifically shown to
allow the brain to focus on multiple conversations and improve comprehen-
sion for the listener.
Pressing the concentric volume knob (Push HRTF) toggles the PAC45L
MultiTalker spatial function on
(receiver sources distributed) or off
(receiver audio sources neutral). The
HRTF button on the pilot and copilot
panels control the function for the user
of that panel.
Audio Location
This adjustment allows the three Spatial
Audio inputs to be
“
relocated
”
on any
of nine (9) pre
-
defined
“
Head Related
Transfer Function
”
(HTRF) locations.
