User Manual
Table Of Contents
- Cover
- Introduction
- Example 1) One remote location, and four microphones in the meeting room
- Example 2) One remote location, and eight microphones in the meeting room
- Example 3) Four remote locations, and four mics in the meeting room
- Example 4) Dividing between two meeting rooms and conferencing with separate locations
- Appendix
MTX5-D/MY4-AEC System Setup Manual 24
Signal processing in the MY4-AEC
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.
The signal flow is as follows.
There are two NR (Noise Reduction) locations: From Far-end and To Far-end. Each has the following roles.
From Far-end
Reduces steady-state noise from sources such as a projector or air conditioning unit in
the remote location.
To Far-end
Reduces steady-state noise from sources such as a projector or air conditioning unit in
the local location.
Appendix
From Far-end AFar-end Voice A
NR
REFERENCE ON/OFF
From Far-end BFar-end Voice B
NR
From Far-end CFar-end Voice C
NR
From Far-end DFar-end Voice D
NR
To Far-end 4
Near-end Mic. 4
Near-end Voice 4
To Far-end 3
Near-end Mic. 3
Near-end Voice 3
To Far-end 2
Near-end Mic. 2
Near-end Voice 2
To Far-end 1
Near-end Mic. 1
Near-end Voice 1
NR
FBS
AEC
NR
FBS
AEC
NR
FBS
AEC
NR
FBS
AEC
NR
FBS
: Reference signal
: Feedback suppressor
: Noise reduction
C.S.G., PA Development Division
© 2013 Yamaha Corporation
312PO-A0