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In the average conference room you will likely see a hybrid of presentation microphones and conferencing microphones. When applying AEC mix-minus to different microphones, you should treat them as such. The example above utilizes all handheld microphones that are often locally reinforced. See the matrix mixer below for an example: This is because a microphone should never be sent to its own reference, under any circumstances. The mix-minus comes into effect when you must reference each microphone to each other, but not to itself. We must also send all 12 microphones to the AEC Ref so that there is no echo is produced by the local reinforcement.
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The AEC Ref still needs to receive the Codec Receive signal, so that it can be echo-canceled out as it normally would. In order to create an AEC mix minus you must have a unique path from a mixer to each channel of the AEC Ref.įor simplicity, the file below will be used as an example, 12 handheld microphones that will be used for local reinforcement and conferencing. Putting a microphone's signal into the reference for all other microphones can help greatly to clean up the way the system sounds to the far end. This can contribute to a muddy, reverberant sound. Part of your voice signal will also be picked up by the other microphones in the room, and will be sent to the far end of the conference. In other words, when you speak into mic 1 your voice will come out of the speakers in the room. An AEC mix-minus system is required if any microphone will be used for both speech reinforcement and distance conferencing. This is due to the fact that these microphones will be played out of the local speakers in the room.