ATEIS ECS User Manual
Page 23
ECS MANUAL
Version EN.1
23
The purpose of Ateïs AEC is for cancellation the acoustic echo in the remote conference
applications. The audio quality is wide bandwidth up to 24 kHz. With the Double Talk Detection, the
AEC improves the interactive communication. It can also support the maximum delay time achieved
to 128ms and perform the echo cancellation efficiently.
Depending of the application, different schematic using the AEC can be made. They are explained in
the following chapters.
ACOUSTIC ECHO CANCELLATION RULES
At first we have to define the signal labeling.
Signals Definitions:
Far-In signal: The audio signal source on which the echo cancellation process is applied.
Generally it's the microphone.
Far-End signal: The audio signal used as reference for the echo cancellation process.
AEC Rules:
Microphones:
Every microphone has to use the AEC before to be sent to the transmission through a mixer if
necessary.
Each microphone needs one AEC channels.
The reference of these AEC channels is the Far-End signal after the AEC treatment.
After proper adjustment of the level (in the input component, and in the mixer) the volume
control of the microphone has to be done with the Near-End Volume parameter of the AEC
component.