Polycom manual INTEGRATING THE EF2241 INTO YOUR SYSTEM, Input Settings, Calibration

INTEGRATING THE EF2241 INTO YOUR SYSTEM

INTEGRATING THE EF2241 INTO YOUR SYSTEM

Operating the EF2241

The EF2241 can be operated in two ways: through the LCD menu on the front panel or through RS-232. For control via RS-232, please refer to the EF2241 Programming Guide, which includes programming tips as well as the EF2241 RS-232 commands. For operation using the PC control software, Conference Composer, please refer to the Conference Composer User Guide.

Use Conference Composer software to easily configure the EF2241 with a PC, or refer to the Applications Guide for different configurations that are already pro- grammed into factory presets.

INPUT SETTINGS

Set Inputs 1-4 for Mic or Line Level

Select Phantom Power for Inputs 1-4

Configure Inputs 1-4 for mic or line level using the LCD menu (See “Level” on page 30) or Conference Composer Control Software (See the Conference Composer User Guide).

Turn phantom power On or Off for Inputs 1-4 using the LCD menu (See “Phantom Power” on page 30) or Conference Composer Control Software (See the Conference Composer User Guide). Phantom power should be turned On for condenser and elec- tret microphones.

CALIBRATION

Set Mic/Line

Input Channel

Gains

When using the factory default, Preset 0, the following calibration can be used.

In Preset 0, Automatic Gain Control (AGC) is On and the microphone gains on Inputs 1-4 are set to 15 dB. The AGC will compensate for the microphone gain. If you are using ceiling microphones, set the microphone gain to 28 dB.

Fine tune the Input Gain using the Automatic Gain Control (AGC) meter on Conference Composer Software. In the Conference Composer

Software, go to the DIAGNOSTICS page. Watch the meter labelled AGC while someone is talking into the particular channel that you are adjusting. Watch the number in the box at the bottom of the AGC meter (See Figure 9 below). This is the amount of gain that the AGC is applying. The goal is to have the AGC meter on average staying around 0. If the level that you see in the box is negative, decrease the input gain by the average number that you see in the box because the AGC is attenuating the chan- nel’s input gain because the level is too high. If the number in the box is positive, increase the input gain on that channel because the AGC is boosting the signal because it is too low. For example, if the meter is showing an average gain of -15 dB,

© Polycom, Inc. 15 VORTEX EF2241 Reference Manual