Polycom EF2241 - Manual (Page 32)

LCD M
ENU
S
TRUCTURE
V ORTEX EF2241 Reference Manual 30 Technical Support: 800.932.2774
I
NPUTS
The input menu allows the user to adjust functions related to the input signals to the
EF2241. This menu contains A
COUSTIC E CHO C ANCELLATION , A UTOMATIC G AIN
C ONTROL , AGC M AXIMUM , AGC M INIMUM , G AIN A DJUST , L EVEL M IC /L INE ,
M UTE , N OISE C ANCELLATION , N OISE C ANCELLATION L EVEL , P HANTOM P OWER ,
R EFERENCE A SSIGN , and AEC S UPPRESSION . The menu is organized around the
Inputs (1-4) and (A-D), so that you first select an input and then select settings for that
input. You can also choose to apply the settings to all Inputs, Inputs 1-4, or Inputs A-
D.
Acoustic Echo Cancellation. This allows you to enable or disable the acoustic
echo canceller on a particular channel. The default is On.
Automatic Gain Control (Inputs 1-4, T). This enables automatic gain con-
trol (AGC) on Inputs 1-4 and T. The default is On.
AGC Max (Inputs 1-4, T). Sets the maximum gain value that the AGC can
apply for Inputs 1-4 and T.
AGC Min (Inputs 1-4, T). Sets the minimum gain value that the AGC can
apply for Inputs 1-4 and T.
Gain. This parameter adjusts the gain level of the 8 inputs. This is normally config-
ured during the calibration process. The default setting is 15 dB for microphone
signals and 0 dBu for line level signals. See “Level” above for setting mic/line level
for Inputs 1-4. The L
EVEL I NDICATOR on the front panel automatically reflects the
level of the channel whose gain is being adjusted.
Level. Use this parameter to select mic or line level on Inputs 1-4.
Mute. This selects which input channel (1-4, A-D) or the W, X, Y, or Z input is
muted. The default is not muted.
Noise Cancellation (Inputs 1-4, T). This allows you to enable or disable
noise cancellation.
Noise Cancellation Level (Inputs 1-4, T).
Selects the level of noise can-
cellation. This ranges from 0 to 15 dB. The default is 10 dB.
Phantom Power.
Use this parameter to turn phantom power On or Off for inputs
1-4.
Echo Canceller Reference.
This parameter decides which reference is associ-
ated with which zone. Choose between R EF 1, R EF 2, or the external bus reference.
AEC Suppression. Sets the amount of double talk suppression used in the AEC.
The values correspond to the following settings: 1 = No Suppression, 2 = Light Sup-
pression, 3 = Heavy Suppression, 4 = Half-Duplex.
Line Echo Cancellation. Enables or disables the echo cancellation on the phone
line.
Dynamics Processing. Enables or disables compression on Input T.
LEC Suppression. Sets the amount of suppression used the line echo canceller
(LEC).
Figure 19. EF2241
Inputs submenu
Inputs 1-4, T, A-D
Mute
Acoustic Echo
Cancellation (In 1-4)
Gain
AGC Maximum
(In 1-4, T)
Level Mic/Line
(In 1-4)
Automatic Gain Control
(AGC), In 1-4, T
Noise Cancellation
Level (In 1-4, T)
Phantom Power
(In 1-4)
Noise Cancellation
(In 1-4, T)
AEC Suppression
(In 1-4)
Reference Assign
(In 1-4)
AGC Minimum
(In 1-4, T)
Dynamics Processing
(In T)
Line Echo Cancellation
(In T)
LEC Suppression (In T)