Gaini -- Set Input Gain - Polycom Vortex EF2241 Programming Manual

Increase incoming gain on all mic inputs
B01GAINGIM>3
by 3 dB.
B01GAINGIM? Query gains on all mic inputs.

8.60. GAINI -- Set Input Gain

The input channels of the Vortex pass through an analog gain stage before reaching the analog to digital
converter. The gain of this stage is adjustable via a digitally controlled analog trim pot. It is important that
this gain is set correctly in order to maximize the resolution and quality of the signal at the analog to digital
converter. This command lets you adjust the gain of these input gain stages. For volume control, the
command can be used to adjust the signal level in the digital domain without affecting the
FADERI
calibration.
This command also adjusts the gain of the input signal coming from the telephone interface.
The following table shows the relationship between the input gain settings (via GAINI and MIC) and the
nominal level expected at each of the inputs.
Input Channel
1-4
1-4
A-D
The GAINIT command has a range of -100 to +20.
This command is a channel integer command. See
type of command. The minimum and maximum values for this command are 0 and 20 or 30, respectively.
MIC Setting GAINI Setting (dB)
1 (mic level) 0 to 30
0 (line level) 0 to 30
N/A (line level) 0 to 20
B01GAINI1a
B01GAINI2b
B01GAINI3c
B01GAINI4d ,
where a, b, c, and d are the new values of
each of the mic inputs. If this command was
issued after the example above, then the status
messages would be:
B01GAINI110
B01GAINI210
B01GAINI310
B01GAINI410 .
B01GAINI1a
B01GAINI2b
B01GAINI3c
B01GAINI4d ,
where a, b, c, and d are the new values of
each of the mic inputs. If this command was
issued after the example above, then the status
messages would be:
B01GAINI110
B01GAINI210
B01GAINI310
B01GAINI410 .
Expected level at Input (dBu)
0 to -30
33 to 3
0 to -20
Section 6.3 and Section 6.2 for more information on this