Polycom Vortex EF2241, Application Note, Page: 9 / 77

S
ETTING THE
AEC R
EFERENCE
U
SING AN I
P
OWER
600
1.
Open A
DMIN
T
OOLS
(there should be a shortcut on the desktop), select the A
UDIO
Category, and click
on the A
UDIO
I
NPUTS
tab. De-select U
SE
E
CHO
C
ANCELLATION
, U
SE
N
OISE
S
UPPRESSION
, and U
SE
A
UTOMATIC
G
AIN
C
ONTROL
(AGC)
2.
Make sure that the Input to the Vortex device is assigned to the appropriate AEC Reference signal.
Consult the Reference Manual for the Vortex device or the Help file in Conference Composer
TM
for
more information.
3.
Turn on the white noise generator in the Vortex device and assign it to the output that will be sent
to the iPower. If the output gain of the Vortex device is set to -10, set the crosspoint to -55. This is
required because if the input of the iPower does not detect a signal, it will turn on the built-in
microphone. Since the internal echo canceller of the iPower is disabled, the far end caller will hear
an echo.
As an example, here are the Mic/Line Inputs and the Matrix Mixer layout of a EF2280 that is
connected to a iPower 680 via Input / Output A:
9