User Manual

2.3. Acoustic Echo Canceller (AEC)
Acoustic Echo Canceller (AEC) is a function that eliminates the acoustic echo that can be a problem
during remote conferencing when sound from a speaker is picked up by microphones, or steady-state
noise such as produced by air conditioning systems. By providing the other party with clear audio from
which such echo and noise have been removed, conversation during the remote conference can be
conducted smoothly.
In order to eliminate acoustic echo that originates with the other party, the other party must also be
equipped with a system that provides an acoustic echo canceller function.
The following amount of delay is added to a signal path in which the AEC component is placed.
When word clock is 44.1 kHz: 17.41 msec
When word clock is 48 kHz: 16.0 msec
When word clock is 88.2 kHz: 17.41 msec
When word clock is 96 kHz: 16.0 msec
Here we explain using an image of 2-channel input.
The AEC inputs are as follows, starting from the top.
• MicIn 1 : Input from mic
• MicIn 2 : Input from mic
• Reference : Input for the signal that you do not want transmitted to the remote location (signal
that is considered as echo, and is to be removed) (e.g., Codec In)
Use mics from the same conference room as the input to MicIn 1 and MicIn 16.
2. Audio Components
ProVisionaire Design Component Guide | 7