Operation Manual

INTEGRATING THE EF2280 INTO YOUR SYSTEM
VORTEX EF2280 Reference Manual 18 Technical Support: 800.932.2774
E CHO C ANCELLER R EFERENCE FOR M ULTIPLE EF2280 S
In a system with multiple devices, we recommend that one device be designated as
the unit that provides the EF bus reference for the acoustic echo cancellers. This unit
takes one of its reference signals (either Ref 1 or Ref 2) and places it on the EF bus.
All other units that are linked together may use the EF bus reference as the reference
for their echo canceller, or they can use their own internal references. The references
may include a mix of any input, with crosspoint gains, including W, X, Y, and Z bus-
ses. Set the EF Bus Reference in the System Menu of the LCD Menu (See “EF Bus
Reference” on page 29).
Setting up the Bus
Reference
If all far end audio and program audio sources are on the same
EF2280,
1. Assign far end audio and program audio sources to Reference 1 on the originat-
ing EF2280.
2. On the EF Bus page in Conference Composer for the originating EF2280, set the
Exported Signals to R
EFERENCE 1. Only one EF2280 can put an echo canceller
reference on the EF Bus as the Bus Reference.
3. On all linked EF2280s, set the echo canceller reference to B
US.
For example, a system uses 2 EF2280s, 1 EF200, and 1 Polycom VS4000 video
codec. The originating sources for far end audio is EF2280 with ID 0. The Matrix for
Figure 11. AEC reference for two rooms that communicate with each other with one
EF2280.
Vortex
®
EF2280
In 1
In 2
In 3
In 4
In 5
In 6
In 7
In 8
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
Out 7
Out 8
In A
In B
Out A
Out B
In D
Out C
Out D
In C
EF200
From AEC
From Rem.
To AEC
To Rem.
Phone
Polycom Video
CODEC
Line In Line Out
PSTN
EF200
From AEC
From Rem.
To AEC
To Rem.
Phone
Polycom Video
CODEC
Line In Line Out
PSTN
If Room 1's loudspeaker contains a mix of Room 2's
microphones, then Room 1's AEC reference should also
contain Room 2's microphones. The same is true for Room 2's
AEC reference.