User Manual

① AEC [ON] Button
Enables or disables the AEC function.
② [NR] Button
Turns the noise reduction function on/off, to eliminate constant noise from nearby projectors, air conditioners,
etc. It is recommended that this normally be turned on.
③ [THRESHOLD] Knob
When using noise reduction, any noise that exceeds the Threshold level is attenuated to the level set as the
Threshold.
④ Level Meter
Displays the information related to input/output and acoustic echo.
•
[IN] Level Meter
Displays the input level from the microphone.
•
[REF] Level Meter
Displays the input level from Reference.
•
[OUT] Level Meter
Displays the output level from the AEC.
•
[ERL] Level Meter
Displays the ratio between the Reference input and the Amount of echo included in the microphone input
as estimated by the AEC.
A good installation environment is one in which ERL (Echo Return Loss) is between 0 dB and –16 dB. If it
is greater than 0 dB, the input level of the microphone may be too high or the microphone and speaker
may be too close. If it is lower than –16 dB, the microphone’s input level may be too low.
•
[ERLE] Level Meter
Displays the amount (in dB) of acoustic echo that the AEC has removed from the microphone input as a
result of learning. If the echo is removed correctly, a negative value will be displayed.
•
[TER] Level Meter
Displays the amount (in dB) of acoustic echo ultimately removed.
⑤ [RESET] Button
The information learned by AEC is resent when this is clicked.
⑥ Port Text Box
Displays the port name. The name can be changed by double-clicking.
14. Audio Processor MRX7-D
212 | ProVisionaire Design V1.2 User Guide