Yamaha V4.0 Owner's Manual download pdf (Page 485)

Chapter 6 Component Guide

DME Designer Owner’s Manual

485

Name Function

Mic In. meters These meters display the signal levels from the

corresponding near-end microphones.

Ref In meters Display the level of the far-end input signals that are used

for AEC reference individually for each channel.

Maintaining the reference signals at optimum levels leads

to maximum echo cancellation efficacy.

Echo Attn. meters Display the echo cancellation strength for each channel.

The higher the level the stronger the echo cancellation

effect.

ERL meters Display the ERL (Echo Return Loss = the amount of

speaker output that is picked up by the microphone) for

each channel. Echo cancellation will be most effective if

the microphone and speaker positions/orientations are

adjusted so that this level is minimal.

Section Parameter Range Function

AEC AEC On ON/OFF Turns the echo canceller function ON or OFF. When OFF,

AEC “learning” will also stop.

Effect 1, 2, 3, 4 Sets the strength of echo cancellation. Higher values

correspond to higher echo cancellation strength. Higher

values also result in reduced sound quality, so these

settings should always be made while checking the

sound.

Distance 2 ~ 40

(meters)

Specifies the distance between the microphone and

speaker used. If multiple microphones and speakers are

used, the distance between closest microphone and

speaker should be specified. If the microphone-to-

speaker distance is less than 2 meters, use the 2 meter

setting.

Advanced button Opens the Advanced Settings editor window (see

page 486).

NR On ON/OFF Turns the noise reduction function that automatically

reduces constant environmental noises such as projector

fans or air conditioning ON or OFF. These settings should

normally be ON.

Matrix Router ON/OFF Determines whether far-end input signals A~D will be

used as reference signals for AEC channels 1~4.

Far-end Noise Reduction ON/OFF These buttons individually turn noise reduction for far-end

input channels A~D ON or OFF. These settings should

normally be ON.

Feedback

Suppressor

FBS On ON/OFF Turn feedback suppression for the corresponding signal

ON or OFF. Turning this function ON can prevent

unwanted feedback that may occur when the near-end

microphone input is being monitored via the local speaker

system.

Width 1/10, 1/60,

1/93 (oct)

Specifies the width of the notch filter that will be applied at

the detected feedback frequency. This function makes it

possible to reduce the bandwidth of the feedback

suppressor notch filters when the filters begin to have

noticeable negative impact on sound quality. A setting of

“1/93” results in the narrowest notch filter bandwidth.

Reducing bandwidth can also reduce the effectiveness of

feedback suppression. The default setting is “1/10”.

Depth -6, -12, -18

(dB)

Specifies the attenuation of the notch filter that will be

applied at the detected feedback frequency. A setting of

“-18” results in the strongest feedback suppression, but

this can also lead to a reduction in sound quality. The

default setting is “-6”.

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Yamaha V4.0 Owner's Manual Page 485

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