Kramer Electronics Ltd.
AFM-20DSP
– Processing Audio Signals
30
Using AFS (Auto Feedback Suppression) Module
Use the Auto Feedback Suppression module to eliminate microphone feedback (applies to
analog inputs 1 to 4).
We recommend analog inputs 1 to 4 for microphones to eliminate audio feedback.
To adjust the AFS module:
1. In the Navigation List, click
DSP
.
2. Click
AFS
. The button turns turquoise and the AFS module page opens.
Figure 27: Processing View
– AFS Module
3. Click the Off button
. The AFS module turns on
.
4. Set each of the 8 bands to dynamic (Dyn) or fixed (Fix), depending on the application.
Figure 28: AFS Module
– Selecting Input Fixed or Dynamic AFS Band Values
5. Define the following:
▪
Threshold
(dB)
– Sets the AFS activation threshold for feedback suppression.
▪
Max Depth
(dB)
– Sets how deep the cut per band.
▪
Notch Step Size
– Sets the decrease in dB steps until reaching Max depth.
▪
Default Bandwidth
(Oct)
– Sets the width of the notch.
▪
Recycle Delay
– Sets time period [Hours] until the filters are reused.
6. Select the sensitivity from
Very High
to
Very Low
.