Yamaha MY4 Owner's Manual download pdf (Page 17)

MY4-AEC Owner’s Manual 17

6 Check that the ERL (Echo Return Loss) meter in the AEC component is

moving.

If this meter is moving over a wide range it means that a large portion of the pink noise

being output from the speaker is being picked up by the corresponding microphone, and

therefore a large amount of echo will be transmitted to the remote location. Carefully adjust

the positions and pickup directions of the four microphones in relation to the speakers in

order to reduce this echo level as much as possible. The more you can reduce the echo at

this stage, the more effective the AEC will be.

NOTE

• If the local meeting room is very reflective or reverberant, it may be difficult to reduce the echo

level sufficiently by simply repositioning the microphones and speakers. In such cases it may

be necessary to apply acoustic panels to the walls or use other means to reduce room

reflections.

• If only the green segment of the ERL meter lights, setting the “Effect” parameter to 1 or 2 should

be optimum, but if the yellow segment of the ERL meter lights an “Effect” setting of 3 or 4 will be

required to produce the best results. Since the actual effectiveness of the processing will

depend on the rooms in which it is used it is important make adjustments while actually

connected to and conferring with the remote location.

• If the input signal becomes distorted for any reason before it reaches the Near-end Mic. 1 – 4

inputs of the AEC component, echo cancelling will not function properly.

7 Enter the microphone-to-speaker distance in meters into the Acoustic

Echo Canceller section “Distance” field.

If multiple speakers are used, enter the distance between the microphone and nearest

speaker for each channel.

If the distance is less than 2 meters, use the default value of “2”. For greater distances

enter the appropriate value.

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Yamaha MY4 Owner's Manual Page 17