Polycom EF2241 manual Inputs 1-4, T, A-D

LCD MENU STRUCTURE

INPUTS

Inputs 1-4, T, A-D

Acoustic Echo

Cancellation (In 1-4)

Automatic Gain Control

(AGC), In 1-4, T

AGC Maximum

(In 1-4, T)

AGC Minimum

(In 1-4, T)

Gain

Level Mic/Line (In 1-4)

Mute

Noise Cancellation

(In 1-4, T)

Noise Cancellation Level (In 1-4, T)

Phantom Power

(In 1-4)

Reference Assign

(In 1-4)

AEC Suppression

(In 1-4)

Line Echo Cancellation

(In T)

Dynamics Processing

(In T)

LEC Suppression (In T)

Figure 19. EF2241

Inputs submenu

The input menu allows the user to adjust functions related to the input signals to the EF2241. This menu contains ACOUSTIC ECHO CANCELLATION, AUTOMATIC GAIN CONTROL, AGC MAXIMUM, AGC MINIMUM, GAIN ADJUST, LEVEL MIC/LINE,

MUTE, NOISE CANCELLATION, NOISE CANCELLATION LEVEL, PHANTOM POWER, REFERENCE ASSIGN, and AEC SUPPRESSION. 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 LEVEL INDICATOR 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 REF1, REF2, 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).

VORTEX EF2241 Reference Manual 30 Technical Support: 800.932.2774