ATEIS ECS User Manual
Page 30
ECS MANUAL
Version EN.1
30
AEC WITH CODEC SERVER
Schematic:
As internet doesn't provide the multi-cast, the most of time, a multi-point conference system
use a video codec server. Each client of this system sends its audio signal to the video codec server.
The video codec server mixes all the received signals in one and sends it to each client of the
system. That means that each the clients receive the audio signal of every client and also its own
signal. It's done like this because otherwise it would take too much process time to send only each
signal to its target.
In this following schematic you can that the Client 1 send its signal to the codec server and
receive a mixed signal of the client signal 2,3 and 4, including its own signal 1.
The first using of the AEC is to send a proper signal to the codec server. It simulates the local
reflections, and removes them from the signal to be sent.
The AEC component modifies the signal of the local microphone by using the far-end signal as
reference.