Yamaha V4.0 DME Designer V4.0 Owners Manual - Page 485

Chapter 6 Component Guide  Mic In. meters Ref In meters Name Echo Attn. meters ERL meters Section  AEC Parameter Range AEC On ON/OFF Effect 1, 2, 3, 4 Distance 2 ~ 40 (meters) Advanced button NR On ON/OFF  Matrix Router  Far-end Noise Reduction ON/OFF ON/OFF  Feedback FBS On Suppressor ON/OFF Width 1/10, 1/60, 1/93 (oct) Depth -6, -12, -18 (dB) Function These meters display the signal levels from the corresponding near-end microphones. 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. Display the echo cancellation strength for each channel. The higher the level the stronger the echo cancellation effect. 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. Function Turns the echo canceller function ON or OFF. When OFF, AEC "learning" will also stop. 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. 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-tospeaker distance is less than 2 meters, use the 2 meter setting. Opens the Advanced Settings editor window (see page 486). 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. Determines whether far-end input signals A~D will be used as reference signals for AEC channels 1~4. These buttons individually turn noise reduction for far-end input channels A~D ON or OFF. These settings should normally be ON. 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. 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". 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". DME Designer Owner's Manual 485