Polycom Vortex EF2241, Примечание к применению

Страница: 44 / 77

You may connect either the left or the right channel of the auxiliary line level output to
the Vortex device. Any audio that is sent from the far side will be monaural.
Please follow our instructions for wiring the Vortex device to the codec (See “Wiring
from VS4000 to Vortex device”). Failure to do so may induce noise into the signals sent
and received from the codec.
3. Raise the gain on the appropriate Input of the Vortex device to +10 dB.
4. Lower the gain on the appropriate Output of the Vortex device to -10 dB.
It is important to set the gain structure correctly so that you don't clip the input audio
stage of the codec and that the Vortex device gets a good signal to perform processing
with. The nominal input and output of the codec is .3 V rms. The nominal input and
output of the Vortex device is .775 V rms. This equates to a difference of 8.24 dB between
the two nominal levels. For simplicity, you may round that value to 10 dB.
S
ETTING THE
AEC R
EFERENCE
U
SING A
VS4000
1.
Connect a monitor to Output 1 of the codec. By default, the composite output is enabled and the S-
Video output is disabled.
2.
Go to S
YSTEM
I
NFO
, A
DMIN
S
ETUP
, P
HONE
A
UDIO
, and check the E
CHO
C
ANCELLER
option. Ignore the
warning that is displayed on the screen about disabling the echo canceller and select OK.
3.
Once that is completed, 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 for more information.
44