Yamaha MY4-AEC Owner's Manual page 7

MY4-AEC Signal Flow
The local and remote locations in a teleconferencing system are referred to as the "near end"
and "far end", respectively. The MY4-AEC acoustic echo canceller (AEC) works by comparing
the reference signal received from the far-end with the signal from the microphone in order to
determine which components of the signal are echo, and then subtracts only the far-end echo
component from microphone signal. The near-end sound is thus clearly transmitted to the far
end without echo.
From Far - end A
From Far - end B
From Far - end C
From Far - end D
To Far - end 4
To Far - end 3
To Far - end 2
To Far - end 1 NR
NR
NR
NR
NR
Matrix Router
NR
NR
NR
AEC
Reference signal
AEC
AEC
FBS
AEC
FBS
Near - end Mic. 1
Near - end Voice 1
FBS
FBS: Feedback suppressor
Far - end Voice A
Far - end Voice B
Far - end Voice C
Far - end Voice D
Near - end Mic. 4
Near - end Voice 4
FBS
Near - end Mic. 3
Near - end Voice 3
Near - end Mic. 2
Near - end Voice 2
NR: Noise reduction
MY4-AEC Owner's Manual
7