User Manual

Table Of Contents

Acoustic Echo Canceller (AEC)

MRX Designer User Guide

❑ 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 reflected

from a wall, 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 MRX7-D can provide up to eight channels of AEC per unit.

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: 26.17 msec

When word clock is 48 kHz: 24.02 msec

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 2.

■ “AEC” editor

Here you can make settings related to AEC. In the left side of the screen, make settings for

the mic connected to MicIn 1; in the right side of the screen, make settings for the mic

connected to MicIn 2.

1 AEC [ON] button

Switches the AEC function between enabled and disabled.

NOTE