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Priority:
It is divided into three levels---normally open, prior and standard. The normally
open channel, free from the limit of maximum MICs and the threshold, can output
signals directly. Both the prior channel and the standard channel are limited by the
maximum MICs and the threshold. The prior level is higher than the standard level.
Generally, select the priority to be “prior”.
Max MIC Numbers:
It is to set the maximum channels which can output signals
simultaneously. At most five channels can output signals simultaneously. Generally, select
the maximum MICs to be 1.
Threshold:
The channel can output level only when the input level is above the threshold
value, and the number of MICS has not reached the maximum. Generally, select the
value to be about -20dB.
Delay Time:
Other channels whose levels are are above the threshold can output level
only when one channel’s level is below the threshold and the speed has been delayed for
such a long time.
7.2.2.11 AFC
The AFC feedback eliminator is used to automatically detect and suppress the acoustic
feedback in the audio system, and is able to distinguish feedback from frequency
satisfyingly. when feedback has been detected, a notch filter will be added to attenuate
the frequency of feedback.
Filters Option:
There are four modes for users to choose--conference 1, conference 2,
music1 and music 2. The four modes vary in the detection sensitivity. The notch filter’s
notch gain is different from its bandwidth.
Filters Number:
There are 12-filter and 16-filter options. The default is the 12-filter
option.
Depth limit:
The maximum notch depth limit of the filter ranges from 0dB to -20dB.
