Operation Manual

A
DVANCED
I
NSTALLATION
ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 33
calibration. For Calibration Step 3, the S
ETUP
LED will blink three times per
period.
For this step, you will need a live connection to a remote conferencing site (or
two sites if you are configuring the EF1210 for two AEC reference inputs).
• If you are configuring the EF1210 for operation with one AEC reference
input, you will calibrate the AEC A signal.
• If you are configuring the EF1210 for operation with two AEC reference
inputs, you will calibrate both the AEC A and the AEC B signals.
3.2. Press R
EF
S
ELECT
to select between AEC A and AEC B. This will be indicated
by the front panel AEC A and AEC B LEDs. During this step, all other LEDs
(I
NPUT
C
HANNEL
) will be extinguished.
3.3. Have the person at the remote end of the conferencing link sit at a normal dis-
tance from a microphone and talk at a normal level while you observe the signal
activity on the R
EMOTE
S
IGNAL
L
EVEL
M
ETER
.
3.4. Adjust the AEC Reference Input by pressing the L
EVEL
A
DJUST
buttons until the
first yellow (0 dB) LED lights regularly during normal speech at the remote end,
and the second yellow LED flickers occasionally.
3.5. If you are calibrating two AEC Reference Inputs, switch to the other by pressing
R
EF
S
ELECT
and repeat the calibration for the second reference signal.
Refer to Figure 13 on page 33.
C
ALIBRATION
S
TEP
4: C
ALIBRATING FOR
P
LAYBACK AND
R
ECORD
4.1. Once the AEC Reference Inputs have been calibrated, press A
UX
I
N
L
EVEL
/
S
ETUP
again to switch to Playback/Record calibration. For Calibration Step 4,
the S
ETUP
LED will blink four times per period. This step calibrates the T
O
Figure 13. Calibrating AEC Reference Inputs
-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20
AUX IN
LEVEL
REF
SELECT
INPUT
SELECT
SETUP
AEC
A
AEC
B
12345678
INPUTPOWER REMOTE
MUTE
ALL
LEVEL
ADJUST
SETUP
STEP 3.4: adjust
level until person
talking at remote
site rarely flickers
second yellow LED
STEP 3.2: press
to select
reference input
source
AEC A input selected
AEC B input selected
LED blinks three
times for AEC
Reference calibration
Caution!
If you skip this calibration step, you will compromise the
performance of the EF1210. The audio coming from the
remote end may be too low, so if you turn up the loud-
speaker to compensate, the acoustic gain will be affected.